阅读说明：本技术 一种高炉淬渣蒸汽消白集成工艺及装置 (Blast furnace quenching slag steam whitening integrated process and device ) 是由 范小刚 李菊艳 崔伟 李鹏 于 2021-08-06 设计创作，主要内容包括：本发明提供了一种高炉淬渣蒸汽消白集成工艺,用蒸汽消白塔代替蒸汽冷凝塔,蒸汽消白塔在垂直方向集成了冲渣粒化系统、淬渣蒸汽收集系统、蒸汽换热系统、热风混合系统。冲渣粒化系统产生淬渣蒸汽,经淬渣蒸汽收集系统将蒸汽送到蒸汽换热系统,淬渣蒸汽在蒸汽换热系统与空气或水换热,降低蒸汽的温度和饱和湿度,换热后的淬渣蒸汽与换热加热的空气在热风混合系统进行混风,利用含水很少的热空气稀释换热后的淬渣蒸汽,降低混合气的含水率,使混合气排放到大气时,不产生“白色烟羽”。蒸汽换热系统工作时,可完全采用空气换热,也可以空气换热为主,辅以水换热。本发明还提供了一种高炉淬渣蒸汽消白集成装置。(The invention provides a steam whitening integration process for blast furnace quenching slag, which replaces a steam condensing tower with a steam whitening tower, and the steam whitening tower integrates a slag flushing granulation system, a quenching slag steam collecting system, a steam heat exchange system and a hot air mixing system in the vertical direction. The slag flushing granulation system generates quenching slag steam, the steam is sent to the steam heat exchange system through the quenching slag steam collecting system, the quenching slag steam exchanges heat with air or water in the steam heat exchange system to reduce the temperature and the saturation humidity of the steam, the quenching slag steam after heat exchange and the air heated by heat exchange are mixed in the hot air mixing system, the hot air with little water is used for diluting the quenching slag steam after heat exchange, the water content of the mixed gas is reduced, and when the mixed gas is discharged to the atmosphere, white smoke plume is not generated. When the steam heat exchange system works, air heat exchange can be completely adopted, and the steam heat exchange system can also be mainly used for air heat exchange and assisted by water heat exchange. The invention also provides a blast furnace quenching slag steam whitening integrated device.)

1. A blast furnace quenching slag steam whitening integrated process is characterized in that: the steam white-light eliminating tower integrates a slag flushing granulating system, a quenching slag steam collecting system, a steam heat exchange system and a hot air mixing system from bottom to top in the vertical direction, the slag flushing granulating system generates quenching slag steam, the quenching slag steam is collected by the quenching slag steam collecting system and then sent to the steam heat exchange system, the quenching slag steam exchanges heat with air or water in the steam heat exchange system, the temperature and the saturation humidity of the steam are reduced, the quenching slag steam after heat exchange and air heated by heat exchange are mixed in the hot air mixing system, the hot air is used for diluting the quenching slag steam after heat exchange, the water content of mixed gas is reduced, and the steam white-light eliminating is realized.

2. The blast furnace slag steam whitening integrated process as defined in claim 1, characterized in that: the steam heat exchange system adopts an air heat exchanger, or adopts the air heat exchanger and a water heat exchanger to carry out combined heat exchange; the steam heat exchange system adopts one heat exchanger or integrates more than two heat exchangers.

3. The blast furnace slag steam whitening integrated process as defined in claim 1, characterized in that: the method comprises the following steps: s1, the blast furnace slag falls down at the tail end of the slag runner, and the granulating water is sprayed out from the granulating tank for slag flushing, granulating and water quenching; s2, enabling the slag-water mixture to enter a slag flushing granulating pool at the bottom of the steam white-removing tower, then flowing to a dewatering rotary drum for slag-water separation, and enabling slag flushing hot water to enter a hot water tank; s3, in the steps S1 and S2, a large amount of quenching steam is generated along with the molten slag meeting water, the quenching steam is gathered above the slag flushing granulating pool, the top of the dehydration rotary drum is communicated with the upper part of the slag flushing granulating pool, the quenching steam exchanges heat with air or water in a steam heat exchange system, the air is heated by using the waste heat of the quenching steam, and the water heat exchange is used for assisting in reducing the temperature of the quenching steam.

4. The blast furnace slag steam whitening integrated process as defined in claim 3, characterized in that: in step S3, the steam blower introduces the quenching slag steam to the heat exchange system from above the slag-washing granulation tank, the air blower introduces air to the heat exchange system, and the steam and the hot air are mixed after heat exchange to form a mixed gas which is discharged to the atmosphere, thereby achieving steam whitening.

5. The blast furnace slag steam whitening integrated process of claim 4, characterized in that: and heat exchange condensate water generated by the phase change of the quenching slag steam in the heat exchange system is sent to the hot water tank.

6. The blast furnace slag steam whitening integrated process as defined in claim 3, characterized in that: in step S3, when the heat exchange system uses water for heat exchange to assist in reducing the steam temperature, the heat exchanger supplies water to enter the heat exchange system for heat exchange with the quenching slag steam, and the water discharged from the heat exchanger is sent to the hot water tank.

7. The blast furnace slag steam whitening integrated process of claim 6, characterized in that: the water supply of the heat exchanger is supplied by a slag treatment system supplementing water system.

8. The blast furnace slag steam whitening integrated process as defined in claim 3, characterized in that: after the hot water in the hot water tank is precipitated, the hot water is sent to a cooling tower for cooling through a return water pump, and then the granulated water is sent to a granulation tank through a water supply pump.

9. The utility model provides a blast furnace quenching sediment steam white integrated device that disappears which characterized in that: the system comprises a steam-white-out tower, wherein the steam-white-out tower is arranged in the vertical direction and sequentially integrates a slag-flushing granulating system, a quenching slag steam collecting system, a steam heat exchange system and a hot air mixing system from bottom to top, the slag-flushing granulating system comprises a granulating tank for water-quenching blast furnace slag, the granulating tank is arranged at the tail end of a slag channel for conveying the blast furnace slag, the slag-flushing granulating system also comprises a dewatering rotary drum, a cooling tower and a slag-flushing granulating pool positioned at the bottom in the steam-white-out tower, the dewatering rotary drum and the cooling tower are positioned outside the steam-white-out tower, a slag-water mixture generated by water-quenching the blast furnace slag flows to the dewatering rotary drum from the bottom of the slag-flushing granulating pool, the top of the dewatering rotary drum is communicated with the upper part of the slag-flushing granulating pool, a hot water tank is arranged at the bottom of the dewatering rotary drum, the hot water tank is communicated with a water inlet of the cooling tower through a pipeline and a water return pump, a water outlet of the cooling tower is communicated with the granulating tank through a pipeline and a water supply pump, providing granulation water to a granulation tank; the quenching slag steam collecting system comprises a steam fan which pumps the quenching slag steam collected above the slag-flushing granulation pool into the steam heat exchange system.

10. The blast furnace slag steam whitening integrated device of claim 9, characterized in that: the steam heat exchange system comprises a heat exchange system and an air fan which pumps air into the heat exchange system, the heat exchange system is positioned in the steam white-eliminating tower and above the slag flushing granulation pool, the heat exchange system is communicated with a slag treatment system water supplementing system, the slag treatment system water supplementing system supplies water to the heat exchange system, the heat exchange system is communicated with a hot water tank, the heat exchange system sends heat exchange condensate water generated by phase change of water outlet of the heat exchanger and quenching slag steam to the hot water tank, the hot air mixing system comprises a mixing chamber for mixing the steam after heat exchange and hot air to obtain mixed gas, the mixing chamber is communicated with the heat exchange system through a pipeline, the pipeline is used for respectively feeding the steam after heat exchange and the hot air generated by the heat exchange system into the mixing chamber, the mixing chamber is positioned at the top of the steam white-eliminating tower and above the heat exchange system, and is provided with an exhaust pipe for exhausting the mixed gas to the atmosphere.

Technical Field

The invention relates to the field of ferrous metallurgy industry and quenching slag steam treatment, in particular to a blast furnace quenching slag steam whitening integrated process and a device.

Background

For a long time, the steam treatment of blast furnace quenching slag in the ferrous metallurgy industry is a difficult problem.

Blast furnace slag is the most main byproduct of the steel industry, about 300kg of blast furnace slag is produced per ton of iron, and the smelting slag temperature is about 1450 ℃, so that the blast furnace slag is a very high-quality heat source. At present, the treatment method of blast furnace slag at home and abroad mainly adopts a water quenching method, and uses water to impact and crush the slag into slag particles. By adopting a water quenching process, 40-60% of the high-temperature waste heat of the slag is converted into the low-temperature waste heat of the steam. And, because the quenching slag steam contains H₂S and SO₂And the paint has strong corrosivity on peripheral equipment and steel structures, and forms white steam pollution.

At present, in the production of blast furnaces, steam generated by contacting slag flushing water with high-temperature molten slag is discharged to the atmosphere at high altitude through a chimney in some steel mills, and steam whitening is performed in some steel mills by building a steam condensing tower in a slag treatment system and adopting a water spraying and condensing mode. However, the single water spraying mode is adopted to condense and recycle the quenching slag steam, the effect is not good in the actual production, and the main problems are as follows: the spraying water amount is large; the sprayed backwater needs to be cooled by a cooling tower, and the cooling circulating water amount is large; the temperature of spray water supplied from the cooling tower is about 45 ℃, which affects the condensation effect.

In addition, the slag amount shows the characteristic of dynamic fluctuation in the slag discharging process of the blast furnace, so that the fluctuation of the steam amount of the quenching slag is large. In particular, the maximum instantaneous slag discharge of the blast furnace slag sometimes reaches twice the average slag discharge. Under the working condition of large amount of quenching slag steam, even if spraying equipment is increased and the water spraying amount is increased, the effective contact of spraying water and steam is difficult to ensure, the steam is often overflowed and can not be condensed, and the ideal whitening effect can not be realized.

Because the steel industry at home and abroad lacks a mature blast furnace quenching slag steam whitening technology. Therefore, it is necessary to develop a new steam whitening process for blast furnace slag quenching. The new process should save energy and water, and can realize ideal whitening effect under the condition of large fluctuation of the steam amount of the quenching slag.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, provides a blast furnace quenching slag steam whitening integrated process, has the characteristics of energy saving, water saving and land occupation saving, can realize an ideal whitening effect even under the working condition of fluctuation of quenching slag steam quantity, and at least solves part of problems in the prior art.

The invention is realized by the following steps:

the invention provides a steam whitening integrated process for blast furnace quenching slag, which comprises the following steps: the steam white-light eliminating tower integrates a slag flushing granulating system, a quenching slag steam collecting system, a steam heat exchange system and a hot air mixing system from bottom to top in the vertical direction, the slag flushing granulating system generates quenching slag steam, the quenching slag steam is collected by the quenching slag steam collecting system and then sent to the steam heat exchange system, the quenching slag steam exchanges heat with air or water in the steam heat exchange system, the temperature and the saturation humidity of the steam are reduced, the quenching slag steam after heat exchange and air heated by heat exchange are mixed in the hot air mixing system, the hot air is used for diluting the quenching slag steam after heat exchange, the water content of mixed gas is reduced, and the steam white-light eliminating is realized.

Preferably, the steam heat exchange system adopts an air heat exchanger, or adopts an air heat exchanger and a water heat exchanger for combined heat exchange; the steam heat exchange system adopts one heat exchanger or integrates more than two heat exchangers.

Preferably, the blast furnace quenching slag steam whitening integrated process comprises the following steps: s1, the blast furnace slag falls down at the tail end of the slag runner, and the granulating water is sprayed out from the granulating tank for slag flushing, granulating and water quenching; s2, enabling the slag-water mixture to enter a slag flushing granulating pool at the bottom of the steam white-removing tower, then flowing to a dewatering rotary drum for slag-water separation, and enabling slag flushing hot water to enter a hot water tank; s3, in the steps S1 and S2, a large amount of quenching steam is generated along with the molten slag meeting water, the quenching steam is gathered above the slag flushing granulating pool, the top of the dehydration rotary drum is communicated with the upper part of the slag flushing granulating pool, the quenching steam exchanges heat with air or water in a steam heat exchange system, the air is heated by using the waste heat of the quenching steam, and the water heat exchange is used for assisting in reducing the temperature of the quenching steam.

Preferably, in step S3, the steam blower introduces the quenching slag steam to the heat exchange system from above the slag-washing granulation tank, the air blower introduces air to the heat exchange system, and the steam and the hot air are mixed after heat exchange to form a mixed gas which is discharged to the atmosphere, so as to realize steam whitening.

Preferably, heat exchange condensate water generated by the phase change of the quenching slag steam in the heat exchange system is sent to the hot water tank.

Preferably, in step S3, when the heat exchange system uses water for heat exchange to assist in lowering the steam temperature, the heat exchanger supplies water to the heat exchange system for heat exchange with the quenching slag steam, and the water discharged from the heat exchanger is sent to the hot water tank.

Preferably, the heat exchanger feed water is supplied by a slag treatment system makeup water system.

Preferably, after the hot water in the hot water tank is precipitated, the hot water is sent to a cooling tower for cooling through a return water pump, and then the granulated water is sent to a granulation tank through a water supply pump.

The invention provides a blast furnace quenching slag steam white elimination integrated device which comprises a steam white elimination tower, wherein a slag flushing granulation system, a quenching slag steam collecting system, a steam heat exchange system and a hot air mixing system are sequentially integrated in the vertical direction from bottom to top by the steam white elimination tower, the slag flushing granulation system comprises a granulation box for water quenching and granulating blast furnace slag, the granulation box is arranged at the tail end of a slag channel for conveying blast furnace slag, the slag flushing granulation system also comprises a dewatering rotary drum, a cooling tower and a slag flushing granulation tank positioned at the bottom in the steam white elimination tower, the dewatering rotary drum and the cooling tower are both positioned outside the steam white elimination tower, a slag-water mixture generated by water quenching and granulating the blast furnace slag flows to the dewatering rotary drum from the bottom of the slag flushing granulation tank, the top of the dewatering rotary drum is communicated with the upper part of the slag flushing granulation tank, the bottom of the dewatering rotary drum is provided with a hot water tank, and the hot water tank is communicated with a water inlet of the cooling tower through a pipeline and a water return pump, a water outlet of the cooling tower is communicated with the granulation tank through a pipeline and a water supply pump to provide granulation water for the granulation tank; the quenching slag steam collecting system comprises a steam fan which pumps the quenching slag steam collected above the slag-flushing granulation pool into the steam heat exchange system.

Preferably, the steam heat exchange system comprises a heat exchange system and an air fan for pumping air into the heat exchange system, the heat exchange system is positioned in the steam white-eliminating tower and above the slag flushing granulation pool, the heat exchange system is communicated with a slag treatment system water supplementing system, the slag treatment system water supplementing system supplies water for the heat exchanger to the heat exchange system, the heat exchange system is communicated with the hot water tank, the heat exchange system sends heat exchange condensate water generated by phase change of water outlet of the heat exchanger and quenching slag steam to the hot water tank, the hot air mixing system comprises a mixing chamber for mixing the steam after heat exchange and hot air to obtain mixed gas, the mixing chamber is communicated with the heat exchange system through a pipeline, the pipeline is used for respectively feeding the steam after heat exchange and the hot air generated by the heat exchange system into the mixing chamber, the mixing chamber is positioned at the top of the steam white-eliminating tower and above the heat exchange system, and is provided with an exhaust pipe for exhausting the mixed gas to the atmosphere.

The invention has the following beneficial effects:

the invention provides a blast furnace quenching slag steam whitening integration process, which has the characteristics of energy saving, water saving and land occupation saving, and when a steam heat exchange system works, the steam heat exchange system can completely adopt air heat exchange, mainly adopt air heat exchange and be assisted with water heat exchange, so that an ideal whitening effect can be realized even under the working condition of fluctuation of quenching slag steam quantity.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a flow chart of a steam whitening integration process for blast furnace slag quenching provided by an embodiment of the invention;

fig. 2 is a schematic view of a blast furnace slag steam whitening integrated device provided by the embodiment of the invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1-2, the embodiment of the invention provides a blast furnace slag steam whitening integrated process: the steam white-light eliminating tower integrates a slag flushing granulating system, a quenching slag steam collecting system, a steam heat exchange system and a hot air mixing system from bottom to top in the vertical direction, quenching slag steam is generated by the slag flushing granulating system and is collected by the quenching slag steam collecting system, the quenching slag steam is sent to the steam heat exchange system, the quenching slag steam exchanges heat with air or water in the steam heat exchange system, the temperature and the saturation humidity of the steam are reduced, the quenching slag steam after heat exchange and the air heated by heat exchange are mixed in the hot air mixing system, the hot air with little water is used for diluting the quenching slag steam after heat exchange, the water content of mixed gas is reduced, and steam white elimination is realized. The invention can prevent the generation of white smoke plume when the mixed gas is discharged to the atmosphere. When the steam heat exchange system works, air heat exchange can be completely adopted, and the steam heat exchange system can also be mainly used for air heat exchange and assisted by water heat exchange. The new steam whitening process has the characteristics of energy saving, water saving and land occupation saving, and can adapt to the working condition of the fluctuation of the steam amount of the quenching slag.

The steam heat exchange system can adopt an air heat exchanger, and can also adopt the air heat exchanger and a water heat exchanger to carry out combined heat exchange; the steam heat exchange system can adopt one heat exchanger or integrate more than two heat exchangers.

The blast furnace quenching slag steam whitening integrated process specifically comprises the following steps: s1, the blast furnace slag falls down at the tail end of the slag runner 1, and the granulating water 21 is sprayed out from the granulating tank 2 for slag flushing, granulating and water quenching; s2, enabling the slag-water mixture to enter a slag flushing granulating pool 3 at the bottom of a steam white-eliminating tower 4, enabling the slag-water mixture to flow to a dewatering rotary drum 16 for slag-water separation, enabling slag flushing hot water to enter a hot water tank 17, enabling the hot water in the hot water tank 17 to be precipitated, then sending the hot water to a cooling tower 18 through a water return pump 19 for cooling, and then sending granulating water 21 to a granulating tank 2 through a water supply pump 20; s3, in steps S1 and S2, a large amount of quenching steam 8 is generated along with molten slag meeting water, the quenching steam 8 is gathered above the slag flushing granulating pool 3, the top of the dewatering rotary drum 16 is communicated with the upper side of the slag flushing granulating pool 3, the quenching steam 8 exchanges heat with air or water in a steam heat exchange system, the air heat exchange is mainly used for exchanging heat, the air is heated by using the waste heat of the quenching steam, and the water heat exchange is used for assisting in reducing the temperature of the quenching steam.

In step S3, the steam blower 7 introduces the quenching slag steam 8 to the heat exchange system 6 from above the slag-washing granulation tank 3, the air blower 9 introduces the air 10 to the heat exchange system 6, and the steam 11 and the hot air 12 are mixed after heat exchange to form a mixed gas 13 which is discharged to the atmosphere, so as to realize steam whitening. And heat exchange condensate water 15 generated by the phase change of the quenching slag steam in the heat exchange system 6 is sent to a hot water tank 17.

In step S3, when the heat exchange system 6 uses water heat exchange to assist in lowering the steam temperature, the heat exchanger water supply 5 enters the heat exchange system 6 to exchange heat with the quenching slag steam, and the heat exchanger effluent 14 is sent to the hot water tank 17. The heat exchanger feed water 5 is supplied by a slag handling system make-up water system 22.

The embodiment of the invention also provides a blast furnace quenching slag steam whitening integration device, which comprises a steam whitening tower 4, wherein the steam whitening tower is sequentially integrated with a slag flushing granulation system 25, a quenching slag steam collecting system 26, a steam heat exchange system 27 and a hot air mixing system 28 from bottom to top in the vertical direction.

The slag flushing granulation system comprises a granulation tank 2 for water quenching and granulating blast furnace slag, the granulation tank 2 is arranged at the tail end of a slag channel 1 for conveying the blast furnace slag, the slag flushing granulation system also comprises a dehydration rotary drum 16, a cooling tower 18 and a slag flushing granulation pool 3 positioned at the bottom in a steam-white-eliminating tower, the dehydration rotary drum 16 and the cooling tower 18 are both positioned outside the steam-white-eliminating tower 4, a slag-water mixture generated by the water quenching and granulating of the blast furnace slag flows to the dehydration rotary drum 16 from the bottom of the slag flushing granulation pool 3, the top of the dehydration rotary drum 16 is communicated with the upper part of the slag flushing granulation pool 3, a hot water tank 17 is arranged at the bottom of the dehydration rotary drum 16, the hot water tank 17 is communicated with a water inlet of the cooling tower 18 through a pipeline and a water return pump 19, and a water outlet of the cooling tower 18 is communicated with the granulation tank 2 through a pipeline and a water supply pump 20 to provide granulation water 21 for the granulation tank 2.

The quenching slag steam collecting system comprises a steam fan 7 which pumps the quenching slag steam 8 collected above the slag-flushing granulating pool 3 into a steam heat exchange system.

The steam heat exchange system comprises a heat exchange system 6 and an air fan 9 for pumping air 10 into the heat exchange system 6, the heat exchange system 6 is positioned in the steam white eliminating tower and above the slag flushing granulation pool 3, the heat exchange system 6 is communicated with a slag treatment system water supplementing system 22, the slag treatment system water supplementing system 22 provides heat exchanger water supply 5 for the heat exchange system 6, the heat exchange system 6 is communicated with a hot water tank 17, and the heat exchange system 6 sends heat exchange condensate water 15 generated by phase change of quenching slag steam and effluent water 14 of the heat exchanger to the hot water tank 17.

The hot air mixing system comprises a mixing chamber 24 for mixing heat-exchanged steam 11 and hot air 12 to obtain mixed gas 13, the mixing chamber 24 is communicated with the heat exchange system 6 through a pipeline, the pipeline is used for respectively sending the heat-exchanged steam 11 and the hot air 12 generated by the heat exchange system 6 into the mixing chamber 24, the mixing chamber 24 is positioned at the top of the steam white-eliminating tower 4 and above the heat exchange system 6, and the mixing chamber 24 is provided with an exhaust pipe for exhausting the mixed gas 13 to the atmosphere 23.

As shown in fig. 2, the blast furnace slag falls down at the end of the slag runner 1, and the granulated water 21 is ejected from the granulation tank 2 to perform slag flushing granulation and water quenching. The slag-water mixture enters a slag flushing granulating pool 3 at the bottom of a steam bleaching tower 4, then flows to a dewatering rotary drum 16 for slag-water separation, and slag flushing hot water enters a hot water tank 17. In this process, a large amount of vapor is generated with the molten slag in contact with water. The steam is gathered above the slag flushing granulating pool 3, and the top of the dewatering rotary drum 16 is communicated with the upper part of the slag flushing granulating pool 3.

The steam fan 7 leads quenching slag steam 8 to the heat exchange system 6 from the upper part of the slag flushing granulation pool 3, the air fan 9 leads air 10 to the heat exchange system 6, and the steam 11 and hot air 12 are mixed after heat exchange to form mixed gas 13 which is discharged to the atmosphere, thereby realizing steam whitening. And heat exchange condensate water 15 generated by the phase change of steam in the heat exchange system 6 is sent to a hot water tank 17.

When the heat exchange system 6 adopts water heat exchange to assist in reducing the steam temperature, the heat exchanger supplies water 5 to enter the heat exchange system 6, and the outlet water 14 of the heat exchanger is also sent to the hot water tank 17. The heat exchanger feed water 5 is supplied by a slag handling system make-up water system 22.

After being precipitated, the hot water in the hot water tank 17 is sent to a cooling tower 18 for cooling through a water return pump 19, and then the granulation water 21 is sent to the granulation tank 2 through a water supply pump 20.

At 2500-3200 m³For example, in the process of white elimination by blast furnace quenching slag steam, when the blast furnace is normally produced, the average quenching slag steam amount is 15-18 ten thousand Nm³H, up to about 35 ten thousand Nm³H is used as the reference value. In order to adapt to all the production working conditions,the design capacity of the steam fan is considered in terms of maximum steam flow. In a specific embodiment, a variable-frequency speed regulating motor is adopted by a steam fan, and the working air quantity is reduced by adopting variable-frequency speed reduction under the working condition of low steam quantity; the number of the air fans is designed according to the maximum steam quantity, the air fans comprise standby fans, and the standby air fans are closed under the working condition that the steam quantity is not large, so that the energy consumption is reduced.

The temperature of steam entering the heat exchanger is 80-90 ℃, the temperature of steam after heat exchange is 70-80 ℃, and the temperature of air after heat exchange is 65-75 ℃.

The heat exchanger water supply 5 for assisting water heat exchange adopts water supplement of a slag treatment water system, the average water supply amount is 200 t/h-600 t/h of water supplement amount, the water quality is industrial purified water, the water pressure is 0.5-0.8 MPa, and the water temperature is normal temperature. The continuous or discontinuous water supply mode can be adopted, and auxiliary heat exchange is carried out according to the requirements of working conditions.

The hot water in the hot water tank 17 is sent to the cooling tower 18 by the return pump 19 for cooling, and then sent to the granulation tank 2 by the water supply pump 20 for granulating and flushing slag, the circulating water amount is about 2000t/h, and the water supply temperature of the cooling tower 18 is about 45 ℃.

The quenching slag steam whitening integration process adopts a steam whitening tower to replace a steam condensing tower, and the steam whitening tower integrates a slag flushing granulation system, a quenching slag steam collecting system, a steam heat exchange system and a hot air mixing system from bottom to top. The slag flushing granulation system generates quenching slag steam, the quenching slag steam collecting system sends the steam to the steam heat exchange system through a fan, the quenching slag steam exchanges heat with air or water in the steam heat exchange system to reduce the temperature and the saturation humidity of the steam, the quenching slag steam after heat exchange and the air heated by heat exchange are mixed in a hot air mixing system, the hot air with little water is used for diluting the quenching slag steam after heat exchange, the water content of the mixed gas is reduced, when the mixed gas is discharged to the atmosphere, the water content of the mixed gas is lower than the steam saturation degree in the air, and white smoke plume is avoided. The effluent 14 of the heat exchanger and the heat exchange condensate 15 generated by the phase change of the steam are supplemented into the slag treatment water system.

When the steam heat exchange system works, air heat exchange can be completely adopted, and the steam heat exchange system can also be mainly used for air heat exchange and assisted by water heat exchange. The waste heat of the steam is mainly used for heating the air, and the steam temperature can be reduced by the aid of water heat exchange. The steam whitening integrated process has the characteristics of energy conservation, water conservation and land occupation saving, and can adapt to the working condition of the fluctuation of the steam amount of the quenching slag.

The quenching slag steam white elimination integration process adopts a steam white elimination tower device, and the steam white elimination tower is sequentially integrated with a slag flushing granulation system, a quenching slag steam collection system, a steam heat exchange system and a hot air mixing system from bottom to top in the vertical direction. The steam heat exchange system can adopt one type of heat exchanger, such as an air heat exchanger; or the air heat exchanger and the water heat exchanger can be simultaneously adopted for combined heat exchange. The steam heat exchange system can adopt one heat exchanger or integrate more than two heat exchangers. The steam heat exchange system mainly exchanges heat with air. The air heat exchange runs synchronously with the slag tapping of the blast furnace, and the auxiliary heat exchange runs continuously or discontinuously according to the working condition. The air entraining capacity of the steam fan is designed according to the maximum steam generation amount, and the blowing capacity of the air fan is designed according to the requirement of heat exchange of the maximum steam amount. The heat exchanger for assisting water heat exchange supplies water by adopting the water supplement of a slag treatment water system, and the average water supply amount is 200 t/h-600 t/h of the water supplement amount.

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.