阅读说明：本技术 一种高炉冲渣乏汽消白的系统 (System for eliminating white waste steam of blast furnace slag flushing ) 是由 邵松 万大阳 吕凤 程宁宁 唐聚园 于 2020-04-29 设计创作，主要内容包括：本发明提供了一种高炉冲渣乏汽消白系统,包括冲渣乏汽收集单元：用于收集渣沟内的乏汽；喷淋过滤除尘单元：通过喷淋过滤除尘装置进行净化过滤；空冷换热除湿单元：包括相变蓄热换热结构,所述相变蓄热换热结构包括相变蓄热材料形成的蓄热体,所述相变蓄热材料能够在固—液两相之间进行转化,用于对乏汽进行换热；热空气混兑消白单元：用于混合升温的热空气和降温除湿的乏汽,并将混合后的气体排出。本发明所述的高炉冲渣乏汽消白系统,通过采用蓄热体换热装置实现空冷换热除湿功能,能够完美弥补现有技术中的不足,优化系统设计规模,提升消白系统全时间段的有效利用率,从而提高投入产出比。(The invention provides a blast furnace slag flushing dead steam whitening system, which comprises a slag flushing dead steam collecting unit: the waste steam collecting device is used for collecting waste steam in the slag runner; a spray filtering and dust removing unit: purifying and filtering the mixture by a spraying, filtering and dedusting device; air cooling heat transfer dehumidification unit: the phase-change heat storage and exchange structure comprises a heat accumulator formed by a phase-change heat storage material, wherein the phase-change heat storage material can convert between a solid phase and a liquid phase and is used for exchanging heat of exhaust steam; a hot air mixing and white removing unit: the hot air used for mixing temperature rise and the exhaust steam used for temperature reduction and dehumidification are discharged. According to the blast furnace slag flushing exhaust steam white elimination system, the heat accumulator heat exchange and dehumidification functions are realized, so that the defects in the prior art can be perfectly overcome, the system design scale is optimized, the effective utilization rate of the white elimination system in the whole time period is improved, and the input-output ratio is improved.)

1. A blast furnace slag flushing dead steam whitening system is characterized by comprising

A slag flushing dead steam collecting unit: the device is used for collecting the exhaust steam in the slag runner and conveying the exhaust steam to the spraying, filtering and dedusting unit;

a spray filtering and dust removing unit: purifying and filtering the waste steam by a spraying, filtering and dedusting device to eliminate dust, particulate matters and acidic pollutants carried in the waste steam;

air cooling heat transfer dehumidification unit: the phase-change heat storage and exchange structure comprises a dead steam suction inlet, a discharge outlet and a phase-change heat storage and exchange unit formed by a phase-change heat storage material, wherein the phase-change heat storage material can convert between a solid phase and a liquid phase and is used for exchanging heat for the dead steam;

a hot air mixing and white removing unit: the hot air dehumidifying device is used for mixing hot air heated after heat exchange and dehumidification of the air cooling heat exchange and dehumidifying unit and dead steam for cooling and dehumidifying, and discharging mixed gas.

2. The blast furnace slag-flushing steam-exhaust white-elimination system as claimed in claim 1, wherein the phase-change heat-storage heat-exchange structure is a multi-layer heat-storage ball-filled structure, or an integral honeycomb structure, or a grid structure, or a sleeve structure composed of a plurality of sleeves, and a phase-change heat-storage steam-exhaust channel (26) for flowing of steam-exhaust and a phase-change heat-storage heat-exchange unit for realizing heat-exchange phase change are arranged in the phase-change heat-storage heat-exchange structure.

3. The blast furnace slag-flushing dead steam whitening system of claim 2, characterized in that the phase-change heat storage and exchange structure comprises a phase-change heat storage body (12), the phase-change heat accumulator (12) is provided with a phase-change heat accumulator exhaust steam inlet (22) and a phase-change heat accumulator exhaust steam outlet (23), the phase change heat accumulator exhaust steam inlet (22) is communicated with the spraying, filtering and dedusting unit, the phase change heat accumulator exhaust steam outlet (23) is used for discharging exhaust steam after heat exchange through the phase change heat accumulation heat exchange structure, the phase change heat accumulator (12) comprises a shell, a phase-change heat accumulator tray (21) is arranged in the shell, a phase-change heat accumulator ball (20) is arranged on the phase-change heat accumulator tray (21), the phase-change heat accumulator (12) adopts a coating or capsule structure form, and a phase change heat accumulator steam exhaust channel (26) for flowing of steam exhaust is arranged on the phase change heat accumulator (12).

4. The blast furnace slag-flushing dead steam white-elimination system according to claim 3, wherein the phase-change heat accumulator tray (21) is provided with a plurality of layers, a plurality of phase-change heat accumulator balls (20) are arranged on each layer of the phase-change heat accumulator tray (21), gaps among the plurality of phase-change heat accumulator balls (20), gaps among the plurality of layers of the phase-change heat accumulator trays (21), and gaps between the phase-change heat accumulator balls (20) and the phase-change heat accumulator tray (21) constitute a phase-change heat accumulator dead steam channel (26).

5. The blast furnace slag-flushing dead steam whitening system as claimed in claim 3, wherein the phase-change heat storage ball (20) comprises two parts of a phase-change heat storage body coating (24) and a phase-change heat storage filling material (25) in the coating, and the phase-change heat storage body coating (24) is made of a plastic corrosion-resistant material.

6. The blast furnace slag-flushing dead steam whitening system as recited in claim 5, characterized in that the phase-change heat storage filling material (25) in the phase-change heat storage body coating (24) is a composite phase-change material made by mixing paraffin and graphite.

7. The blast furnace slag flushing dead steam white elimination system according to any one of claims 1 to 6, wherein the slag flushing dead steam collection unit comprises a slag runner cover plate (1), a dead steam pipeline (3) and a dead steam induced draft fan (4), the slag runner cover plate (1) is arranged right above a slag runner and forms a closed channel of slag flushing dead steam together with the slag runner, and the dead steam induced draft fan (4) conveys the dead steam in the closed channel to the spray filtering and dust removal unit through the dead steam pipeline (3).

8. The blast furnace slag flushing dead steam whitening system according to claim 7, characterized in that a plurality of dead steam branch pipes are arranged on the slag runner cover plate (1) in a segmented manner, each dead steam branch pipe is provided with an electric adjusting baffle (2), the electric adjusting baffle (2) is used for adjusting the dead steam amount of each segment, and the plurality of dead steam branch pipes are converged to a dead steam pipeline (3).

9. The blast furnace slag-flushing dead steam whitening system as claimed in claim 1 or 8, wherein the spraying, filtering and dedusting unit comprises a spraying device, a demister (10) and a first water collecting tank (11), water sprayed by the spraying device and defoamed by the demister (10) is collected to the first water collecting tank (11), and water in the first water collecting tank (11) can be returned to the slag flushing tank (5).

10. The blast furnace slag-flushing dead steam whitening system according to claim 9, characterized in that the spraying devices comprise a first stage spraying device (8) and a second stage spraying device (9), and the first stage spraying device (8) and the second stage spraying device (9) are respectively arranged at the front side and the rear side of the demister (10).

11. The blast furnace slag flushing dead steam whitening system as claimed in claim 9, characterized in that a water pump (7) is arranged between the spraying device and the slag flushing tank (5), and the water pump (7) can pump the water in the slag flushing tank (5) to the spraying device.

12. The blast furnace slag flushing dead steam whitening system according to claim 11, characterized in that an alkali adding system (6) is arranged between the water pump (7) and the slag flushing tank (5), and the alkali adding system (6) is used for increasing the pH value of the pumping water in the water pump (7).

13. The blast furnace slag flushing dead steam whitening system according to claim 7, characterized in that a dead steam induced draft fan (4) in the slag flushing dead steam collecting unit is a centrifugal fan, the front end of the centrifugal fan is connected with the slag runner cover plate (1) through a dead steam pipeline (3), and the rear end of the centrifugal fan is connected with the spray filtering and dust removing unit.

14. The blast furnace slag flushing exhaust steam de-whitening system as claimed in claim 3, 4, 5, 6, 8, 10, 11, 12 or 13, wherein the air-cooling heat exchange and dehumidification unit further comprises an air-cooling heat exchanger (13), a second water collection tank (15), an air cooling fan (16) and a flue demister (17), the air-cooling heat exchanger (13) is provided with an exhaust steam inlet, an exhaust steam outlet, an air inlet and an air outlet, a phase change heat accumulator exhaust steam outlet (23) of the phase change heat accumulator (12) is connected with an exhaust steam inlet of the air-cooling heat exchanger (13), the air-cooling heat exchanger (13) exchanges heat with the exhaust steam coming out of the phase change heat accumulator (12) under the action of the air cooling fan (16), the air-cooling heat exchanger (13) is communicated with the hot air mixing and de-whitening unit through a pipeline, the second water collection tank (15) is used for collecting substances condensed and separated out by the air-cooling heat exchanger (13), the second water collecting tank (15) is communicated with the slag flushing tank (5), wet exhaust steam after temperature reduction and dehumidification in the second water collecting tank (15) enters the flue demister (17) through an exhaust steam channel on the side wall of the second water collecting tank (15), and the flue demister (17) is communicated with the hot air mixing and white elimination unit.

15. The blast furnace slag-flushing dead steam whitening system as claimed in claim 14, characterized in that the air-cooled heat exchanger is a plate-type or tube-bundle-type heat exchanger, and the second water collection tank (15) is arranged at a dead steam outlet position on the air-cooled heat exchanger (13).

16. The dead steam de-whitening system for blast furnace flushing slag according to claim 15, characterized in that the water in the second water collecting tank (15) and the first water collecting tank (11) flows to the flushing slag pool (5) under the action of self-weight.

17. The blast furnace slag-flushing dead steam whitening system according to claim 1 or 16, wherein the hot air mixing and whitening unit comprises a mixer (18) having a hot air inlet, a dead steam inlet, and a mixture outlet, the mixture outlet communicating with a chimney (19).

18. The blast furnace flushing slag dead steam whitening system as recited in claim 17, characterized in that the hot air inlet on the mixer (18) is communicated with the air-cooled heat exchanger (13), and the dead steam inlet on the mixer (18) is communicated with the flue mist eliminator (17).

19. The blast furnace slag flushing dead steam whitening eliminating system according to claim 18, wherein a dead steam induced draft fan (4) of the slag flushing dead steam collecting unit is arranged between the air cooling heat exchange and dehumidification unit and the hot air mixing and whitening eliminating unit, the front end of the dead steam induced draft fan is connected with the air cooling heat exchanger (13) through a pipeline, and the rear end of the dead steam induced draft fan is connected with the mixer (18).

20. The blast furnace slag flushing exhaust steam white elimination system according to claim 3, wherein a plurality of channels are arranged on the phase-change heat accumulator (12) to form a phase-change heat accumulator exhaust steam channel (26) of the phase-change heat accumulator (12), two ends of the phase-change heat accumulator exhaust steam channel (26) are respectively communicated with a phase-change heat accumulator exhaust steam inlet (22) and a phase-change heat accumulator exhaust steam outlet (23), and the phase-change heat accumulator filling material (25) is filled among the plurality of channels on the inner side of the phase-change heat accumulator coating (24).

21. The blast furnace slag-flushing dead steam whitening system as claimed in claim 14, characterized in that the phase-change heat accumulator (12) in the air-cooled heat exchange dehumidification unit is designed separately from the air-cooled heat exchanger (13), or the phase-change heat accumulator (12) in the air-cooled heat exchange dehumidification unit is designed integrally with the air-cooled heat exchanger (13).

22. The blast furnace slag-flushing dead steam whitening system according to claim 1 or 21, wherein the dehumidifying and heat-exchanging device in the air-cooling heat-exchanging and dehumidifying unit is a phase-change heat-storage type air-dead steam heat exchanger (14), and a group of air passages and a group of dead steam passages are respectively arranged in the dehumidifying and heat-exchanging device, and the air passages and the dead steam passages are not communicated with each other.

23. The blast furnace slag flushing waste steam whitening system according to claim 22, wherein the phase-change heat accumulating type air-waste steam heat exchanger (14) comprises a phase-change heat accumulating type air-waste steam heat exchanger shell (30), a phase-change heat accumulating heat exchanging unit is arranged in the phase-change heat accumulating type air-waste steam heat exchanger shell (30), the phase-change heat accumulating heat exchanging unit comprises a phase-change heat accumulator coating (24) and a phase-change heat accumulating filling material (25) filled in the phase-change heat accumulator coating (24), a hollow channel is arranged in the phase-change heat accumulator coating (24) and forms a phase-change heat accumulator waste steam channel (26), two ends of the phase-change heat accumulator waste steam channel (26) are respectively communicated with the phase-change heat accumulator waste steam inlet (22) and the phase-change heat accumulator waste steam outlet (23), and a gap between the outer surface of the phase-change heat accumulating type heat exchanging structure and the phase-change heat accumulating type air-waste steam heat exchanger shell (30) forms a phase-change heat accumulating type heat accumulator And two ends of the air channel (27) of the phase-change heat accumulating type air-dead steam heat exchanger are respectively communicated with an air inlet (28) of the phase-change heat accumulating type air-dead steam heat exchanger and an air outlet (29) of the phase-change heat accumulating type air-dead steam heat exchanger.

24. The blast furnace slag flushing dead steam white elimination system according to claim 22, wherein the phase-change heat storage and exchange structure comprises plate-shaped phase-change heat storage modules, each plate-shaped phase-change heat storage module comprises phase-change heat storage and exchange units composed of a phase-change heat storage body coating (24) and a phase-change heat storage filling material (25) filled in the phase-change heat storage body coating, a group of fluid channels are arranged in each phase-change heat storage and exchange unit, another group of fluid channels are arranged between every two adjacent phase-change heat storage and exchange units, the two groups of fluid channels on the plate-shaped phase-change heat storage modules are not communicated with each other, the fluid channels on one group of phase-change heat storage and exchange units are communicated with the phase-change heat storage air-dead steam heat exchanger air inlet (28) and the phase-change heat storage air-dead steam heat exchanger air outlet (29), and the fluid channels on the other group of phase-change heat storage and exchange units are communicated with the phase-change heat storage body dead steam inlet (22), The phase change heat accumulator exhaust steam outlet (23) is communicated.

Technical Field

The invention relates to the technical field of blast furnace slag flushing exhaust steam white elimination, in particular to a blast furnace slag flushing exhaust steam white elimination system, and particularly relates to a blast furnace slag flushing exhaust steam white elimination system adopting a heat accumulator for heat exchange.

Background

In the blast furnace ironmaking production process, the molten slag is mainly treated by adopting a hydraulic slag flushing mode. Because the temperature of the slag is high, about 1400 ℃, in the process of water quenching and granulating by adopting high-speed water flow, the slag flushing water is heated and gasified rapidly in a short time to form slag flushing exhaust steam. The slag flushing exhaust steam has very complicated components, wherein most of the components are water vapor and air, but also contain a large amount of dust (mainly slag particles), SO₂、H₂S, and the like, and aerosols, and the like. The slag flushing exhaust steam is diffused along the slag runner or discharged into the atmospheric environment through a slag runner collection chimney, and can form dense white smoke when meeting cold, thereby causing serious pollution to the environment. The blast furnace slag flushing exhaust steam has the characteristics of unstable working condition, periodic change of temperature and flow, large damp heat, large pollutant content and the like, and is difficult to treat.

According to the difference of the size of the blast furnace, the production process and the like, the generated slag flushing steam-lacking amount is about 5-40 ten thousand Nm3/h and is different. The slag flushing period is about 60-70 min, and the slag flushing is carried out for about 14-20 times a day. In one slag flushing period, the temperature of the exhaust steam is rapidly increased from about 40 ℃ to the peak value, about 95 ℃ for about 10min, and then is slowly decreased to 40 ℃. The flow rate of the dead steam reaches a maximum value along with the temperature rise process and then starts to be gradually reduced until the slag flushing process is finished.

The existing blast furnace slag flushing exhaust steam white removal process mostly adopts a process method of water spraying dust removal and cooling, air cooling dehumidification and hot air mixing, so that the emission reduction of blast furnace slag flushing exhaust steam pollutants and the elimination of white smoke are realized. The peak value temperature of the waste steam of the blast furnace slag flushing is high, the damp and hot is large, the peak value duration is short, when the process is adopted for the waste steam white elimination design, if all working condition points are required to have good white elimination effect, the design must be carried out according to the peak working condition, so the maximum spraying water quantity required by the normal operation of the system and the heat exchange area of the air cooling heat exchanger are very huge, and the capacities of the related auxiliary equipment, such as a water pump, a fan, a pipeline and the like, are correspondingly increased, so that the investment cost of the whole system is relatively high. The duration of the peak is only a few minutes, which is less than 20% of the total slag flushing process. This results in a system with excess processing capacity for most of the other time, which is uneconomical. Water pump, fan etc. consumer adopt frequency conversion to adjust, can reduce the working costs really, nevertheless can make the system become complicated, and regulation and control is frequent moreover, can make the system operation maintenance cost increase.

Disclosure of Invention

In view of the above, the present invention is directed to a system for eliminating white waste steam from blast furnace slag to solve at least one of the above problems. According to the blast furnace slag flushing exhaust steam white elimination system, the heat accumulator heat exchange device is adopted to realize the function of the air cooling heat exchange dehumidification unit, the defects in the prior art can be perfectly overcome, the system design scale is optimized, the effective utilization rate of the white elimination system in the whole time period is improved, and the input-output ratio is improved.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a blast furnace slag flushing dead steam whitening system comprises

A slag flushing dead steam collecting unit: the exhaust steam collecting unit is used for collecting exhaust steam in the slag runner and conveying the exhaust steam to the spraying, filtering and dedusting unit;

a spray filtering and dust removing unit: the exhaust steam spraying, filtering and dedusting unit is used for purifying and filtering through a spraying, filtering and dedusting device, and eliminating dust, particulate matters and acidic pollutants carried in the exhaust steam;

air cooling heat transfer dehumidification unit: the air cooling heat exchange dehumidification unit comprises a phase change heat storage heat exchange structure, the phase change heat storage heat exchange structure comprises a waste steam suction inlet, a discharge outlet and a phase change heat storage heat exchange unit formed by a phase change heat storage material, and the phase change heat storage material can be converted between a solid phase and a liquid phase and is used for exchanging heat with waste steam;

a hot air mixing and white removing unit: the hot air dehumidifying device is used for mixing hot air heated after heat exchange and dehumidification of the air cooling heat exchange and dehumidifying unit and dead steam for cooling and dehumidifying, and discharging mixed gas.

Furthermore, the phase change heat storage heat exchange structure is a multilayer heat storage ball filling type structure, or an integral honeycomb type structure, or a grid type structure, or a sleeve type structure formed by a plurality of sleeves, and a phase change heat storage body steam exhaust channel for steam exhaust flowing and a phase change heat storage heat exchange unit for realizing heat exchange phase change are arranged in the phase change heat storage heat exchange structure.

Further, the phase change heat storage heat transfer structure includes the phase change heat storage body, the phase change heat storage body is provided with phase change heat storage body exhaust steam import and phase change heat storage body exhaust steam export, phase change heat storage body exhaust steam import with spray and filter the unit UNICOM of removing dust, phase change heat storage body exhaust steam export is used for discharging the exhaust steam after the heat transfer of phase change heat storage heat transfer structure, the phase change heat storage body includes the casing, is provided with phase change heat storage body tray in the casing be provided with the phase change heat storage ball on the phase change heat storage body tray, the phase change heat storage body adopts the structural style of capsule or capsule be provided with the phase change heat storage body exhaust steam passageway that is used for the exhaust steam to flow on the phase change heat storage body.

Furthermore, the phase-change heat accumulator tray is provided with a plurality of layers, a plurality of phase-change heat accumulation balls are arranged on each layer of the phase-change heat accumulator tray, a plurality of gaps and a plurality of layers of the phase-change heat accumulation balls are arranged between the phase-change heat accumulator trays, and the phase-change heat accumulator steam exhaust channel is formed by the gaps between the phase-change heat accumulation balls and the phase-change heat accumulator tray.

Furthermore, the phase-change heat storage ball comprises a phase-change heat storage body coating and a phase-change heat storage filling material in the coating, wherein the phase-change heat storage body coating is made of a plastic corrosion-resistant material.

Furthermore, the phase-change heat storage filling material in the phase-change heat storage body coating is a composite phase-change material prepared by mixing paraffin and graphite.

Furthermore, the slag flushing exhaust steam collecting unit comprises a slag runner cover plate, an exhaust steam pipeline and an exhaust steam draught fan, wherein the slag runner cover plate is arranged right above the slag runner and forms a closed channel of slag flushing exhaust steam together with the slag runner, and the exhaust steam draught fan conveys the exhaust steam in the closed channel to the spraying, filtering and dedusting unit through the exhaust steam pipeline.

Furthermore, a plurality of exhaust steam branch pipes are arranged on the slag runner cover plate in a segmented mode, an electric adjusting baffle is arranged on each exhaust steam branch pipe, the electric adjusting baffle is used for adjusting the exhaust steam quantity of each segment, and the plurality of exhaust steam branch pipes are converged to an exhaust steam pipeline.

Furthermore, the spraying, filtering and dedusting unit comprises a spraying device, a foam remover and a first water collecting tank, water sprayed by the spraying device and subjected to foam removal by the foam remover is collected to the first water collecting tank, and water in the first water collecting tank can return to the slag flushing pool.

Furthermore, the spraying device comprises a first-stage spraying device and a second-stage spraying device, and the first-stage spraying device and the second-stage spraying device are respectively arranged on the front side and the rear side of the demister.

Furthermore, a water pump is arranged between the spraying device and the slag flushing pool, and the water pump can pump water in the slag flushing pool to the spraying device.

Further, an alkali adding system is arranged between the water pump and the slag flushing pool, and the alkali adding system is used for improving the PH value of the pumped water in the water pump.

Furthermore, an exhaust steam induced draft fan in the slag flushing exhaust steam collecting unit is a centrifugal fan, the front end of the centrifugal fan is connected with a slag runner cover plate through an exhaust steam pipeline, and the rear end of the centrifugal fan is connected with a spraying, filtering and dedusting unit.

Further, the air-cooling heat exchange dehumidification unit also comprises an air-cooling heat exchanger, a second water collecting tank, an air cooling fan and a flue demister, the air-cooled heat exchanger is provided with a dead steam inlet, a dead steam outlet, an air inlet and an air outlet, the phase change heat accumulator dead steam outlet of the phase change heat accumulator is connected with the dead steam inlet of the air-cooled heat exchanger, the air cooling heat exchanger exchanges heat with the exhaust steam from the phase change heat accumulator under the action of the air cooling fan, the air-cooled heat exchanger is communicated with the hot air mixing and white removing unit through a pipeline, the second water collecting tank is used for collecting substances condensed and separated out by the air-cooled heat exchanger, the second water collecting tank is communicated with the slag flushing pool, wet exhaust steam after temperature reduction and dehumidification in the second water collecting tank enters the flue demister through an exhaust steam channel on the side wall of the second water collecting tank, and the flue demister is communicated with the hot air mixing and white fading unit.

Furthermore, the air-cooled heat exchanger is a plate-type or tube bundle-type heat exchanger, and the second water collecting tank is arranged at the position of an exhaust steam outlet on the air-cooled heat exchanger.

Furthermore, water in the second water collecting tank and the first water collecting tank flows to the slag flushing pool under the action of self weight.

Furthermore, the hot air mixing and white removing unit comprises a mixer, wherein the mixer is provided with a hot air inlet, a dead steam inlet and a mixed gas outlet, and the mixed gas outlet is communicated with the chimney.

Furthermore, a hot air inlet on the mixer is communicated with the air cooling heat exchanger, and a dead steam inlet on the mixer is communicated with the flue demister.

Furthermore, the exhaust steam induced draft fan of the slag flushing exhaust steam collecting unit is arranged between the air cooling heat exchange and dehumidification unit and the hot air mixing and white removing unit, the front end of the exhaust steam induced draft fan is connected with the air cooling heat exchanger through a pipeline, and the rear end of the exhaust steam induced draft fan is connected with the mixer.

Furthermore, a plurality of channels are arranged on the phase-change heat accumulator to form a phase-change heat accumulator steam exhaust channel of the phase-change heat accumulator, two ends of the phase-change heat accumulator steam exhaust channel are respectively communicated with a phase-change heat accumulator steam exhaust inlet and a phase-change heat accumulator steam exhaust outlet, and the phase-change heat accumulator filling material is filled among the plurality of channels on the inner side of the phase-change heat accumulator coating.

Furthermore, the phase change heat accumulator in the air cooling heat exchange dehumidification unit and the air cooling heat exchanger are separately designed, or the phase change heat accumulator in the air cooling heat exchange dehumidification unit and the air cooling heat exchanger are designed in an integrated mode.

Furthermore, the dehumidification and heat exchange device in the air-cooling heat exchange and dehumidification unit is a phase-change heat storage type air-exhaust steam heat exchanger, a group of air channels and a group of exhaust steam channels are respectively arranged in the dehumidification and heat exchange unit, and the air channels and the exhaust steam channels are not communicated with each other.

Furthermore, the phase-change heat accumulating type air-exhaust steam heat exchanger comprises a phase-change heat accumulating type air-exhaust steam heat exchanger shell, a phase-change heat accumulating heat exchange unit is arranged in the phase-change heat accumulating type air-exhaust steam heat exchanger shell and comprises a phase-change heat accumulator coating and a phase-change heat accumulating filling material filled in the phase-change heat accumulator coating, a hollow channel is arranged in the phase-change heat accumulator coating and forms a phase-change heat accumulator exhaust steam channel, two ends of the phase-change heat accumulator exhaust steam channel are respectively communicated with a phase-change heat accumulator exhaust steam inlet and a phase-change heat accumulator exhaust steam outlet, a gap between the outer surface of the phase-change heat accumulating heat exchange structure and the phase-change heat accumulating type air-exhaust steam heat exchanger shell forms a phase-change heat accumulating type air-exhaust steam heat exchanger air channel, and two ends of the phase-change heat accumulating type air-exhaust steam heat exchanger air channel are respectively communicated with the phase-change heat accumulating type air-exhaust steam heat exchanger shell The air inlet is communicated with the air outlet of the phase-change heat storage type air-exhaust steam heat exchanger.

Furthermore, the phase-change heat storage heat exchange structure comprises a plate-shaped phase-change heat storage module, the plate-shaped phase-change heat storage module comprises phase-change heat storage heat exchange units which are formed by phase-change heat storage body coatings and phase-change heat storage filling materials filled in the phase-change heat storage heat exchange units, a group of fluid channels are arranged in each phase-change heat storage heat exchange unit, another group of fluid channels are arranged between every two adjacent phase-change heat storage heat exchange units, the two groups of fluid channels on the plate-shaped phase-change heat storage module are not communicated with each other, the fluid channels on one group of phase-change heat storage heat exchange units are communicated with an air inlet of the phase-change heat storage air-exhaust steam heat exchanger and an air outlet of the phase-change heat storage air-exhaust steam heat exchanger, and the fluid channels on the other group of phase-change heat storage heat exchange units are communicated with an exhaust steam inlet of the phase-change heat storage body and an exhaust steam outlet of the phase-change heat storage body.

Compared with the prior art, the blast furnace slag flushing dead steam whitening system has the following advantages:

(1) according to the blast furnace slag flushing exhaust steam white elimination system, through the phase change heat storage heat exchange structure arranged in the air cooling heat exchange dehumidification unit bag, by utilizing the heat storage function of the phase change heat storage body on the phase change heat storage heat exchange structure through the phase change material and the characteristic of large heat storage amount in unit volume, when the exhaust steam peak value comes and the exhaust steam temperature is high, a part of condensation heat of the exhaust steam is quickly absorbed and stored; when the peak value of the exhaust steam passes and the temperature of the exhaust steam is reduced, the phase-change heat accumulator slowly releases the stored heat to compensate the exhaust steam, thereby playing the role of 'peak shifting and valley filling' and enabling the temperature change of the exhaust steam to be relatively stable;

(2) according to the blast furnace slag flushing exhaust steam white elimination system, through reasonably designing the usage amount and the arrangement structural form of the phase change heat storage material, the temperature of exhaust steam can be always kept at a reasonable temperature, for example, about 70 ℃ in one slag flushing period, so that the purposes of ' shifting peaks and filling valleys ' and ' rectifying the flow and the temperature of the exhaust steam are realized, the maximum design value of the processing capacity of the whole system can be further reduced, and the investment cost is greatly reduced;

(3) the blast furnace slag flushing dead steam whitening system ensures glass fiber, dust and SO carried by blast furnace slag flushing dead steam₂Treating pollutants to reach the standard and discharging; the humidity of the exhaust steam is greatly reduced, and water resources are saved; and when visual 'white smoke' is eliminated, the phase change heat accumulator is arranged to perform 'peak shifting and valley filling' on a periodically changing working medium of slag flushing exhaust steam, so that the effect similar to 'rectification' is achieved, the maximum treatment capacity required by the whole system design can be reduced, the effective utilization rate of the system in unit time is improved, the excessive or idle treatment capacity of the system design is avoided, and the system investment cost and the operation and maintenance cost are reduced to the maximum extent.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic view of a process flow in a blast furnace slag flushing dead steam whitening process and system according to an embodiment of the invention;

FIG. 2 is a schematic cross-sectional structural view of a phase change heat accumulator structure according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of another perspective of a phase change heat accumulator structure according to an embodiment of the present invention;

FIG. 4 is a schematic cross-sectional structural view of a phase-change heat storage ball according to an embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view of the phase-change heat accumulator structure according to the second embodiment of the present invention;

FIG. 6 is a schematic cross-sectional view of another perspective of the phase-change heat accumulator structure according to the second embodiment of the present invention;

FIG. 7 is a schematic view of a process flow in the blast furnace slag flushing steam exhaust whitening process and system according to the third embodiment of the invention;

fig. 8 is a schematic cross-sectional structural view of a phase-change regenerative air-exhaust steam heat exchanger according to a third embodiment of the present invention;

fig. 9 is a schematic cross-sectional structural view of another view of the phase-change regenerative air-exhaust steam heat exchanger according to the third embodiment of the present invention;

fig. 10 is a schematic cross-sectional structural view of a phase-change regenerative air-exhaust steam heat exchanger according to a fourth embodiment of the present invention;

fig. 11 is a schematic cross-sectional structural view of another view of the phase-change regenerative air-exhaust steam heat exchanger according to the fourth embodiment of the present invention;

fig. 12 is a schematic top view of a phase-change regenerative air-exhaust steam heat exchanger according to a fourth embodiment of the present invention;

description of reference numerals:

a slag runner cover plate 1; an electric adjusting baffle 2; a steam exhaust pipeline 3; a dead steam draught fan 4; a slag flushing pool 5; an alkali adding system 6; a water pump 7; a first stage spray device 8; a second stage spray device 9; a demister 10; a first header tank 11; a phase change heat accumulator 12; an air-cooled heat exchanger 13; a phase change heat storage air-exhaust steam heat exchanger 14; a second header tank 15; an air cooling fan 16; a flue demister 17; a mixer 18; a chimney 19; a phase change heat storage ball 20; a phase-change heat accumulator tray 21; a phase change heat accumulator exhaust steam inlet 22; a phase change heat accumulator exhaust steam outlet 23; a phase change heat accumulator coating 24; the phase-change heat storage filler material 25; a phase change heat accumulator exhaust steam passage 26; a phase change heat storage type air-exhaust steam heat exchanger air passage 27; an air inlet 28 of the phase change heat storage type air-exhaust steam heat exchanger; an air outlet 29 of the phase change heat storage type air-exhaust steam heat exchanger; a phase change heat storage type air-exhaust steam heat exchanger shell 30; a first plate structure 31; a second plate structure 32.

Detailed Description

In order to make the technical means, objectives and functions of the present invention easy to understand, embodiments of the present invention will be described in detail with reference to the specific drawings.

It should be noted that all terms used in the present invention for directional and positional indication, such as: the terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", "top", "lower", "lateral", "longitudinal", "center", and the like are used only for explaining the relative positional relationship, connection, and the like between the respective members in a certain state (as shown in the drawings), and are only for convenience of describing the present invention, but do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; may be a mechanical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Based on years of research and development experience, the applicant finds that the design and treatment capacity of the blast furnace slag flushing exhaust steam white elimination process is large, the effective utilization rate of the system is low, the system treatment capacity is seriously surplus in more than 80% of time periods, and the investment cost-effectiveness ratio is low due to the characteristics of unstable working condition, periodic change of temperature and flow, large peak temperature and flow, short peak duration and the like of the blast furnace slag flushing exhaust steam. Therefore, the frequency conversion adjustment of the fan and the water pump is realized, the adjustment of the electric baffle of the exhaust steam pipeline is frequent, and the system is complex, so that the labor load of operators is large, and the operation and maintenance cost of the system is high.

Based on the method, the applicant designs the blast furnace slag flushing exhaust steam white elimination process and the blast furnace slag flushing exhaust steam white elimination device adopting the heat accumulator for heat exchange, which can perfectly make up the defects, optimize the system design scale, and improve the effective utilization rate of the white elimination system in the whole time period, thereby improving the input-output ratio.

Example 1:

as shown in figures 1-4, the invention discloses a blast furnace slag flushing dead steam whitening system, which comprises

A slag flushing dead steam collecting unit: the slag flushing exhaust steam collecting unit is used for collecting exhaust steam in the slag runner and conveying the exhaust steam to the spraying, filtering and dedusting unit;

a spray filtering and dust removing unit: the spraying, filtering and dedusting unit is used for purifying and filtering through a spraying, filtering and dedusting device, and eliminating dust, particulate matters and acidic pollutants carried in the exhaust steam;

air cooling heat transfer dehumidification unit: the air cooling heat exchange dehumidification unit comprises a phase change heat storage heat exchange structure, the phase change heat storage heat exchange structure comprises an exhaust steam suction port, a discharge port and a phase change heat storage heat exchange unit formed by a phase change heat storage material, the phase change heat storage material can be converted between a solid phase and a liquid phase and is used for exchanging heat with exhaust steam, the exhaust steam enters the air cooling heat exchange dehumidification unit for heat exchange and dehumidification after coming out of the spraying, filtering and dust removing unit, and the exhaust steam after heat exchange and dehumidification enters the hot air mixing and white elimination unit;

a hot air mixing and white removing unit: the hot air heated after heat exchange and dehumidification by the air cooling heat exchange and dehumidification unit and the exhaust steam cooled and dehumidified are fully and uniformly mixed in the hot air mixing and bleaching unit, and the mixed gas is discharged.

According to the blast furnace slag flushing exhaust steam white elimination system, in the initial stage of the slag flushing process, the temperature of exhaust steam is higher than that of a heat accumulator in a phase-change heat accumulation heat exchange structure, the exhaust steam releases heat to the heat accumulator, the temperature of the exhaust steam is reduced, and a part of steam is liquefied to release condensation heat; in the process, the heat accumulator absorbs heat, when the temperature rises to a certain value, the solid state is gradually converted into the liquid state, and phase-change heat of solid-liquid conversion is used for storing part of condensation heat of the dead steam; in the middle stage of the slag flushing process, the two are kept balanced; in the post-peak stage of the slag flushing process, the temperature of the heat accumulator is higher than that of the exhaust steam, the heat stored by the heat accumulator is released to the exhaust steam, and the heat accumulator gradually changes from a liquid state to a solid state; after the exhaust steam absorbs heat, the self temperature decreasing rate is slowed down; the process is repeated until the next slag flushing cycle is reached.

According to the blast furnace slag flushing exhaust steam white elimination system, through the phase change heat storage heat exchange structure arranged in the air cooling heat exchange dehumidification unit bag, by utilizing the heat storage function of the phase change heat storage body on the phase change heat storage heat exchange structure through the phase change material and the characteristic of large heat storage amount in unit volume, when the exhaust steam peak value comes and the exhaust steam temperature is high, a part of condensation heat of the exhaust steam is quickly absorbed and stored; when the peak value of the exhaust steam passes and the temperature of the exhaust steam is reduced, the phase-change heat accumulator slowly releases the stored heat to compensate the exhaust steam. Therefore, the method plays a role in shifting peaks and filling valleys, so that the temperature change of the dead steam is relatively smooth, the peak value is not as high as original 95 ℃, and the valley value is not as low as original 40 ℃.

The blast furnace slag flushing exhaust steam white elimination system provided by the invention can keep the temperature of exhaust steam at a reasonable temperature, such as about 70 ℃, in one slag flushing period through reasonably designing the consumption and the arrangement structural form of the phase change heat storage material, so that the purposes of shifting peaks and filling valleys, and rectifying the flow and the temperature of the exhaust steam are realized, the design maximum value of the treatment capacity of the whole system can be further reduced, and the investment cost is greatly reduced.

Preferably, as a preferred example of the present invention, the phase-change heat accumulator 12 is shown in fig. 2 to 4, the phase-change heat storage heat exchange structure in the air-cooling heat-exchange dehumidification unit includes a phase-change heat accumulator 12, the phase-change heat accumulator 12 is provided with a phase-change heat accumulator steam exhaust inlet 22 and a phase-change heat accumulator steam exhaust outlet 23, the phase-change heat accumulator steam exhaust inlet 22 of the phase-change heat accumulator 12 is communicated with the spray filter dust removal unit, the phase-change heat accumulator steam exhaust outlet 23 is used for discharging steam exhaust after heat exchange by the phase-change heat storage heat exchange structure, the phase-change heat accumulator 12 includes a housing, a phase-change heat accumulator tray 21 is provided in the housing, the phase-change heat accumulator tray 21 is provided with multiple layers, i.e. a support structure, a plurality of phase-change heat accumulators 20 are disposed on each layer of the phase-change heat accumulator tray 21, the phase-change heat accumulators 20 include two phase-change heat accumulator coatings 24 and phase-change heat storage filler 25 in the coatings, the gaps among the phase-change heat storage balls 20, the gaps among the plurality of layers of phase-change heat storage body trays 21, and the gaps between the phase-change heat storage balls 20 and the phase-change heat storage body trays 21 constitute a phase-change heat storage body steam exhaust passage 26.

Preferably, the phase-change heat accumulator 12 is in a coating or capsule structure, the exterior of the phase-change heat accumulator is covered with a stable corrosion-resistant material, and the interior of the phase-change heat accumulator is filled with a phase-change heat accumulation material, so that when the phase-change heat accumulation material absorbs heat and changes from a solid state to a liquid state, the appearance shape of the whole phase-change heat accumulator is not changed, and a steam exhaust channel is blocked or the phase-change material leaks and runs off. As a preferred example of the present invention, the phase-change heat accumulator coating 24 is made of a plastic corrosion-resistant material, and can maintain the appearance shape of the phase-change heat accumulator during the heat transfer process.

Preferably, the phase-change heat storage filling material 25 in the phase-change heat storage body coating 24 is a composite phase-change material prepared by mixing paraffin and graphite.

After the slag flushing process starts, the exhaust steam treated by the front-stage process flows in from the exhaust steam inlet 22 of the phase-change heat accumulator, and flows out from the exhaust steam outlet 23 of the phase-change heat accumulator. In the initial stage of the slag flushing process, the temperature of the inflow exhaust steam is higher than that of the heat accumulator, the exhaust steam releases heat to the heat accumulator, the temperature of the exhaust steam is reduced, and partial steam is liquefied to release condensation heat; in the process, the heat accumulator absorbs heat, the temperature rises, when the temperature rises to a certain value, the phase-change heat-storage filling material 25 begins to gradually change from a solid state to a liquid state, and the phase-change heat of solid-liquid conversion is used for storing the condensation heat of the exhaust steam. In the post-peak stage of the slag flushing process, the temperature of the heat accumulator is higher than that of the exhaust steam, the heat stored by the phase-change heat-storage filling material 25 is released to the exhaust steam, and the heat is gradually changed from a liquid state to a solid state; after the exhaust steam absorbs heat, the self temperature decreasing rate is slowed down. Therefore, the purposes of shifting peaks and filling valleys and rectifying the flow and the temperature of the exhaust steam are realized, the maximum value of the whole system throughput design can be further reduced, and the investment is reduced.

Preferably, as a preferred example of the invention, the slag flushing exhaust steam collecting unit comprises a slag runner cover plate 1, an exhaust steam pipeline 3 and an exhaust steam induced draft fan 4, wherein the slag runner cover plate 1 is laid right above the slag runner and forms a closed channel for flushing the slag exhaust steam together with the slag runner, and the exhaust steam induced draft fan 4 conveys the exhaust steam in the closed channel to the spray filtering dust removal unit through the exhaust steam pipeline 3.

The arrangement discloses a specific structure of an exhaust steam collecting unit, and the exhaust steam collecting efficiency in a slag flushing exhaust steam closed channel is ensured by the arranged exhaust steam induced draft fan 4, so that the reliability of the use of the blast furnace slag flushing exhaust steam white elimination system is ensured.

Furthermore, a plurality of exhaust steam branch pipes are arranged on the slag runner cover plate 1 in a segmented manner, an electric adjusting baffle 2 is arranged on each exhaust steam branch pipe, the electric adjusting baffle 2 is used for adjusting the exhaust steam amount of each segment, and the plurality of exhaust steam branch pipes are converged to an exhaust steam pipeline 3.

The device further improves the reliability and efficiency of the dead steam collection by adjusting and collecting the dead steam in the slag flushing dead steam closed channel in a sectional manner.

As an example of the invention, the dead steam collecting unit mainly comprises a slag runner cover plate 1; an electric adjusting baffle 2; a steam exhaust pipeline 3; and a dead steam induced draft fan 4. The slag runner cover plate 1 is laid right above the slag runner and forms a closed channel of the slag flushing exhaust steam together with the slag runner. According to the difference of the length of the slag runner, a plurality of exhaust steam collecting branch pipes are arranged above the slag runner cover plate in a segmented mode, electric adjusting baffles 2 are arranged on the exhaust steam branch pipes, and adjustment is carried out according to the difference of exhaust steam quantity of each segment. The exhaust steam enters an exhaust steam draught fan 4 after being converged along the branch pipe, and is conveyed to an exhaust steam spraying, filtering and dedusting unit through the exhaust steam draught fan 4.

Preferably, as a preferred example of the present invention, the spray filter dust removal unit includes a spray device, a demister 10, and a first water collecting tank 11, and water sprayed by the spray device and defoamed by the demister 10 is collected in the first water collecting tank 11, and the water in the first water collecting tank 11 can be returned to the slag flushing tank 5.

This setting discloses a concrete structure of spraying and filtering dust removal unit, guarantees to spray the purification and filtration effect of filtering dust removal unit for the exhaust steam can detach most dust, particulate matter such as glass fiber of carrying basically after spraying and filtering dust removal unit's processing.

The spraying device comprises a first-stage spraying device 8 and a second-stage spraying device 9, wherein the first-stage spraying device 8 and the second-stage spraying device 9 are respectively arranged on the front side and the rear side of the demister 10.

The arrangement discloses a structure of a spraying device, so that collected exhaust steam is treated by steps of spraying, defoaming and spraying in a spraying, filtering and dedusting unit, and the reliability of filtering and removing particles such as dust, glass fiber and the like is further improved.

Preferably, a water pump 7 is arranged between the spraying device and the slag flushing pool 5, and the water pump 7 can pump water in the slag flushing pool 5 to the spraying device.

This setting makes the water pipe in the spray set when not enough pressure, pressurizes through the water pump 7 that sets up, guarantees the spray set and sprays the effect.

Preferably, as a preferred example of the present invention, an alkali adding system 6 is disposed between the water pump 7 and the slag flushing tank 5, and the alkali adding system 6 is used for increasing the PH value of the water pumped in the water pump 7.

The water in the slag flushing tank generally shows alkalinity, and if the alkalinity is insufficient, the water is added with chemicals by arranging an alkali adding system 6. The device is used for eliminating SO received by water in the slag flushing pool 5₂、H₂S and the like.

Preferably, as a preferred example of the present invention, the water in the first water collecting tank 11 is discharged into the slag flushing tank 5 through a pipeline under the action of the self-weight.

As a preferred example of the present invention, the exhaust steam spraying, filtering and dedusting unit mainly comprises a first stage spraying device 8, a second stage spraying device 9, a demister 10, a first water collecting tank 11, etc., wherein the demister 10 is mainly used for removing glass fiber, dust, etc. particles in the exhaust steam; the front and the back of the demister 10 are respectively provided with a primary water spraying device which is a primary spraying device 8 and a secondary spraying device 9, wherein the spraying water adopted by the primary spraying device 8 and the secondary spraying device 9 comes from a slag flushing tank 5, the water in the slag flushing tank generally shows alkalinity, if the alkalinity is insufficient, an alkali adding system 6 is required to be arranged for adding the alkali, and the arranged alkali adding system 6 is used for neutralizing and removing SO in exhaust steam₂、SO₃、H₂And if the pressure of the acid gases such as S and the like and the spray water pipeline is insufficient, a water pump 7 is required to be arranged for pressurization. The sprayed water enters the first water collecting tank 11 and then is discharged into the slag flushing pool 5 under the action of self gravity through a pipeline. The flushing slag and the dead steam collected by the dead steam collecting unit are sent to the spraying, filtering and dedusting unit, and after being filtered by the first secondary water spraying and foam removing device 10, most of carried particles such as dust, glass fiber and the like and SO can be basically removed₂、H₂S and the like.

Preferably, as a preferred example of the present invention, the air-cooled heat exchange and dehumidification unit further includes an air-cooled heat exchanger 13, a second water tank 15, an air cooling fan 16 and a flue demister 17, the air-cooled heat exchanger 13 is provided with a steam exhaust inlet, a steam exhaust outlet, an air inlet and an air outlet, the phase change heat accumulator steam exhaust outlet 23 of the phase change heat accumulator 12 is connected to the steam exhaust inlet of the air-cooled heat exchanger 13, the air-cooled heat exchanger 13 exchanges heat with the steam exhaust from the phase change heat accumulator 12 under the action of the air cooling fan 16, the air inlet of the air-cooled heat exchanger 13 is communicated with the air cooling fan 16, the air-cooled heat exchanger 13 is communicated with the hot air mixing and sterilizing unit through a pipeline, the second water tank 15 is used for collecting harmful substances such as condensed water, soluble salts and aerosols precipitated by the air-cooled heat exchanger 13, and the second water tank 15 is communicated with the flushing slag pool 5, the wet exhaust steam after cooling and dehumidifying in the second water collecting tank 15 enters a flue demister 17 through an exhaust steam channel on the side wall of the second water collecting tank 15, and the flue demister 17 is communicated with a hot air mixing and white removing unit.

The arrangement discloses a specific structure of an air-cooling heat exchange dehumidification unit, exhaust steam from a spraying, filtering and dedusting unit firstly enters a phase-change heat accumulator 12, and exhaust steam flowing out of an exhaust steam outlet 23 of the phase-change heat accumulator on the phase-change heat accumulator 12 enters an air-cooling heat exchanger 13; the air and the ambient air blown by the air cooling fan 16 are subjected to dividing wall type heat exchange, the ambient air absorbs heat and is heated in the heat exchange process, and the heated hot air enters a mixer 18 of a hot air mixing and white removing unit; the exhaust steam releases heat, cools and condenses, and separates out a part of condensed water, soluble salts, aerosol and other harmful substances, the condensed water and the harmful substances enter the second water collecting tank 15 and are sent into a slag flushing pool through a pipeline for treatment, the cooled and dehumidified wet exhaust steam enters the flue demister 17 through the exhaust steam pipeline on the side wall of the second water collecting tank 15, and the wet exhaust steam enters the mixer 18 of the hot air mixing and white removing unit after being filtered and carried away from small liquid drops.

Through the air cooling heat transfer dehumidification unit that contains phase change heat accumulator 12, air cooling heat exchanger 13 that sets up for the exhaust steam that sprays and filter the dust removal unit and come out passes through phase change heat accumulator 12, air cooling heat exchanger 13's in the air cooling heat transfer dehumidification unit in proper order, the dehumidification effect, thereby further improve the stability of the temperature variation of exhaust steam in every cycle, reduce exhaust steam humidity by a wide margin, the water economy resource. And then can further reduce the system investment on the basis of guaranteeing exhaust steam heat transfer dehumidification effect through the heat transfer area that reduces the air cooling heat exchanger, the cooling blower amount of wind, connecting tube diameter etc..

Preferably, as a preferred example of the present invention, the air-cooled heat exchanger is made of a non-metal corrosion-resistant material, and may be in a plate type or a tube bundle type, and the second water collecting tank 15 is disposed at the position of the exhaust steam outlet of the air-cooled heat exchanger 13, and is configured to collect condensed water generated by condensation of the exhaust steam, and the collected condensed water is sent to the slag flushing tank 5 through a pipeline.

An exhaust steam outlet is arranged on the side wall of the second water collecting tank 15, and a horizontal flue type demister is arranged at the exhaust steam outlet.

The exhaust steam enters a flue demister 17 after coming out of the air-cooled heat exchanger 13 and then enters a mixer 18 arranged in the hot air mixing unit. Ambient air blown or sucked by the air cooling fan 16 serving as power enters the air cooling heat exchanger 13 to perform wall type heat exchange with the slag flushing exhaust steam, becomes hot air after heat exchange and temperature rise, is discharged from an air outlet, and is also sent into the mixer through a pipeline after being discharged.

Preferably, as a preferred example of the present invention, the hot air mixing and sterilizing unit includes a mixer 18 having a hot air inlet, a dead steam inlet, and a mixture outlet, the mixture outlet communicating with a stack 19.

As an example of the present invention, the hot air inlet of the mixer 18 is communicated with the air-cooled heat exchanger 13, and the exhaust steam inlet of the mixer 18 is communicated with the flue mist eliminator 17.

Preferably, as a preferred example of the present invention, a plurality of spoilers are provided inside the mixer 18 in order to mix the hot air and the exhaust steam sufficiently and uniformly.

The arrangement discloses a specific structure of a hot air mixing and white eliminating unit, so that when the exhaust steam processed by the blast furnace slag flushing exhaust steam white eliminating system enters the hot air mixing and white eliminating unit, the heated hot air and the cooled and dehumidified exhaust steam are fully and uniformly mixed in a mixer 18, the relative unsaturation degree is greatly improved, and the mixed gas is ensured not to generate white smoke after entering a chimney 19 for emission.

Alternatively, the mixer 18 and the chimney 19 may be separate bodies or may be an integrated structure.

Preferably, as a preferred example of the invention, the exhaust steam induced draft fan 4 in the slag flushing exhaust steam collection unit is a centrifugal fan, the front end of the centrifugal fan is connected with the slag runner cover plate 1 through an exhaust steam pipeline 3, and the rear end of the centrifugal fan is connected with the spray filtering dust removal unit.

Or the waste steam induced draft fan 4 of the slag flushing waste steam collecting unit can also be arranged between the waste steam air-cooling heat exchange and dehumidification unit and the hot air mixing and white removing unit, the front end of the waste steam induced draft fan is connected with the air-cooling heat exchanger 13 through a pipeline, and the rear end of the waste steam induced draft fan is connected with the mixer 18.

The air cooling heat exchange dehumidification unit is the core of the technical scheme. The air cooling heat exchange dehumidification unit is provided with a phase change heat accumulator, and the phase change heat accumulator has the main effects that when the peak value of exhaust steam comes and the temperature of the exhaust steam is higher, a part of condensation heat of the exhaust steam is quickly absorbed and stored through the heat storage function of a phase change material and the characteristic of large heat storage amount per unit volume; when the peak value of the exhaust steam passes and the temperature of the exhaust steam is reduced, the phase-change heat accumulator slowly releases the stored heat to compensate the exhaust steam. Therefore, the method plays a role in shifting peaks and filling valleys, so that the temperature change of the dead steam is relatively smooth, the peak value is not as high as original 95 ℃, and the valley value is not as low as original 40 ℃. By reasonably designing the usage amount and the arrangement structural form of the phase change heat storage material, the temperature of the exhaust steam can be always kept at about 70 ℃ in one slag flushing period. And further, the heat exchange area of the air cooling heat exchanger, the air quantity of a cooling fan, the diameter of a connecting pipeline and the like can be reduced, so that the system investment is reduced.

In embodiment 2, the invention discloses another blast furnace slag flushing exhaust steam white elimination system, as shown in fig. 5 and 6, a plurality of channels are arranged on the phase-change heat accumulator 12 to form a phase-change heat accumulator exhaust steam channel 26 of the phase-change heat accumulator 12, two ends of the phase-change heat accumulator exhaust steam channel 26 are respectively communicated with a phase-change heat accumulator exhaust steam inlet 22 and a phase-change heat accumulator exhaust steam outlet 23, and the phase-change heat accumulator filling material 25 is filled among the plurality of channels inside the phase-change heat accumulator coating 24. The other structures are the same as the embodiment.

Different from the hollow tower filling type structure of the phase-change heat accumulator 12 shown in fig. 2-4 in embodiment 1, the arrangement discloses another structure of the phase-change heat accumulator 12, and the phase-change heat accumulator 12 omits the design of a phase-change heat accumulator tray 21 and forms an integrally formed honeycomb structure.

Preferably, as a preferred example of the present invention, the phase-change heat storage body coating 24 is disposed in a cylindrical shape or a cubic shape, a plurality of channels disposed on the phase-change heat storage body coating 24 are disposed in an array or a staggered shape, and the channels are disposed in a circular or polygonal shape in cross section. As an example of the invention, a cylindrical structure or a cubic structure with a plurality of cylindrical hole channels or rectangular channels or square channels is directly formed by the phase change heat accumulator coating 24, the inside of the cylindrical structure is filled with the phase change heat accumulation filling material 25, the cylindrical hole channels or the rectangular channels or the square channels are in a honeycomb structure design, a phase change heat accumulator exhaust steam channel 26 is formed, and exhaust steam flows in from the phase change heat accumulator exhaust steam inlet 22 at the upper part of the cylinder and flows out from the phase change heat accumulator exhaust steam outlet 23 at the bottom of the cylinder.

In embodiment 3, the invention discloses a third blast furnace slag flushing dead steam white elimination system, as shown in fig. 6 to 9, a phase change heat accumulator 12 and an air cooling heat exchanger 13 in an air cooling heat exchange dehumidification unit are designed to be integrally formed, and other structures are the same as those of other embodiments.

The phase-change heat accumulator 12 and the air-cooling heat exchanger 13 are integrally formed to form a phase-change heat accumulating type air-exhaust steam heat exchanger 14, namely, a dehumidifying and heat exchanging device in the air-cooling heat exchanging and dehumidifying unit is the phase-change heat accumulating type air-exhaust steam heat exchanger 14, a group of air channels and a group of exhaust steam channels are respectively arranged in the dehumidifying and heat exchanging device, and the air channels and the exhaust steam channels are not communicated with each other.

The phase change heat storage type air-exhaust steam heat exchanger is characterized in that the phase change not only means that water vapor in exhaust steam is condensed into liquid from gas, but also means that the adopted phase change heat storage material is converted between solid phase and liquid phase in the heat exchange process.

Preferably, the phase-change heat accumulating type air-exhaust steam heat exchanger 14 comprises a phase-change heat accumulating type air-exhaust steam heat exchanger shell 30, a phase-change heat accumulating heat exchanging unit is arranged in the phase-change heat accumulating type air-exhaust steam heat exchanger shell 30, the phase-change heat accumulating heat exchanging unit comprises a phase-change heat accumulator coating 24 and a phase-change heat accumulating filling material 25 filled in the phase-change heat accumulator coating 24, a hollow channel is arranged in the phase-change heat accumulator coating 24, the hollow channel forms a phase-change heat accumulator exhaust steam channel 26, two ends of the phase-change heat accumulator exhaust steam channel 26 are respectively communicated with a phase-change heat accumulator exhaust steam inlet 22 and a phase-change heat accumulator exhaust steam outlet 23, a gap between the outer surface of the phase-change heat accumulating heat exchanging structure and the phase-change heat accumulating type air-exhaust steam heat exchanger shell 30 forms a phase-change air-exhaust steam heat exchanger air channel 27, two ends of the air channel 27 of the phase-change heat accumulating type air-exhaust steam heat exchanger are respectively communicated with an air inlet 28 of the phase-change heat accumulating type air-exhaust steam heat exchanger and an air outlet 29 of the phase-change heat accumulating type air-exhaust steam heat exchanger.

The phase change heat accumulator exhaust steam inlet 22 is communicated with the spraying, filtering and dedusting unit; the phase change heat accumulator exhaust steam outlet 23 is used for discharging exhaust steam subjected to heat exchange by the phase change heat accumulation heat exchange structure; the air inlet 28 of the phase-change heat storage type air-exhaust steam heat exchanger is communicated with the air cooling fan 16; the air outlet 29 of the phase-change heat storage type air-exhaust steam heat exchanger is used for discharging air subjected to heat exchange through the phase-change heat storage heat exchange structure; and mixing the waste steam after heat exchange and the air after heat exchange in a hot air mixing and bleaching unit.

Preferably, air flows in from the air inlet 28 of the lower left phase-change heat accumulating type air-dead steam heat exchanger and flows out from the air outlet 29 of the upper right phase-change heat accumulating type air-dead steam heat exchanger, and the dead steam and the air are subjected to dividing wall type heat exchange in a counter flow mode.

Further, the hollow channel in the phase change heat storage heat exchange structure in this embodiment may also be a hollow square-column channel, a hollow hexagonal-column channel, or other shapes, such as a regular polygon.

In embodiment 4, the present invention discloses a fourth blast furnace slag flushing dead steam white elimination system, as shown in fig. 10 to 12, the phase change heat storage heat exchange structure includes at least two phase change heat storage modules, each phase change heat storage module includes a phase change heat storage heat exchange unit composed of a phase change heat storage body coating 24 and a phase change heat storage filling material 25 filled therein, the phase change heat storage heat exchange unit includes a first flat plate structure 31 and a second flat plate structure 32, the second flat plate structure 32 is connected between each two first flat plate structures 31, a fluid channel is arranged between each two adjacent phase change heat storage heat exchange units, the fluid channels on the two groups of phase change heat storage modules are not communicated with each other, the fluid channel on one group of phase change heat storage heat exchange units is communicated with the phase change heat storage air-dead steam heat exchanger air inlet 28 and the phase change heat storage air-dead steam heat exchanger air outlet 29, the fluid channels on the other group of phase change heat storage heat exchange units are communicated with the phase change heat storage body exhaust steam inlet 22 and the phase change heat storage body exhaust steam outlet 23, and other structures are the same as other embodiments.

Preferably, the first plate structure 31 is designed to be a large plate structure, and the second plate structure 32 is designed to be a narrow and long strip structure.

Or, a plate-shaped phase-change heat storage module is arranged in the phase-change heat storage type air-exhaust steam heat exchanger 14, a phase-change heat storage body exhaust steam channel 26 and a phase-change heat storage type air-exhaust steam heat exchanger air channel 27 are formed in the plate-shaped phase-change heat storage module, and the phase-change heat storage body exhaust steam channel 26 and the phase-change heat storage type air-exhaust steam heat exchanger air channel 27 are not communicated with each other.

The plate-shaped phase-change heat storage module comprises a phase-change heat storage heat exchange unit which is formed by combining a phase-change heat storage body coating 24 and a phase-change heat storage filling material 25 filled in the phase-change heat storage body coating, the phase-change heat storage heat exchange unit comprises three first plate structures 31, and a phase-change heat storage body exhaust steam channel 26 and a phase-change heat storage type air-exhaust steam heat exchanger air channel 27 are respectively arranged between every three first plate structures 31.

The plate-shaped phase change thermal storage module further includes a second flat plate structure 32, and the second flat plate structure 32 is disposed between two first flat plate structures 31.

The second flat plate structures 32 on both sides of each first flat plate structure 31 are arranged at 90 degrees.

The arrangement discloses another structure of the phase-change heat storage type air-exhaust steam heat exchanger 14, plate-shaped phase-change heat storage heat exchange units are made of phase-change heat storage body coatings 24 and phase-change heat storage filling materials 25 filled in the phase-change heat storage body coatings, and the plate-shaped phase-change heat exchange units comprise plate structures in two forms of large plates and narrow and long strips. The first flat plate structures 31 of every two large flat plates are arranged in parallel, and the second flat plate structures 32 with narrow strips are used as supports in the middle, so that a group of phase change heat storage modules can be formed. The support bars made of the first plate structure 31 and the second plate structures 32 of every three large plates can form a fluid channel between the two phase change heat storage modules. The second flat plate structure 32 (support bar) on the phase change heat storage module forming the adjacent fluid channel in the two groups of phase change heat storage modules forms an included angle of 90 degrees, namely, the phase change heat storage body exhaust steam channel 26 and the phase change heat storage type air-exhaust steam heat exchanger air channel 27 are respectively formed.

The waste steam flows in from a waste steam inlet 22 of the phase-change heat accumulator at the top and flows out from a waste steam outlet 23 of the phase-change heat accumulator at the bottom. Air flows in from the air inlet 28 of the left phase-change heat storage type air-exhaust steam heat exchanger and flows out from the air outlet 29 of the right upper phase-change heat storage type air-exhaust steam heat exchanger, and the exhaust steam and the air perform recuperative heat exchange in a cross flow mode.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.