阅读说明：本技术 一种高炉熔渣底滤消白系统 (White system disappears at bottom of blast furnace slag ) 是由 段国建 王得刚 全强 孟凯彪 陈秀娟 马铭 宿立伟 樊波 于 2019-12-25 设计创作，主要内容包括：本发明公开了一种高炉熔渣底滤消白系统,包括粒化消白塔(2)、第一过滤消白池(6)和第二过滤消白池(16),粒化消白塔(2)的下部设有高炉熔渣入口(9)和粒化器(1),粒化消白塔(2)内设有冷凝喷淋装置(4),粒化消白塔(2)的上部设有蒸汽出口(10),第一过滤消白池(6)和第二过滤消白池(16)均内设有过滤层(7)和过滤管(8),蒸汽出口(10)通过蒸汽输送管线(11)与第一过滤消白池(6)的过滤管(8)和第二过滤消白池(16)的过滤管(8)连接。该高炉熔渣底滤消白系统采用粒化塔喷淋加过滤消白池滤料冷却的双重消白工艺,彻底消除高炉熔渣粒化处理过程中的有害蒸汽,达到真正消白及环保的目的。(The invention discloses a blast furnace slag bottom filtering and whitening system which comprises a granulating and whitening tower (2), a first filtering and whitening pool (6) and a second filtering and whitening pool (16), wherein the lower part of the granulating and whitening tower (2) is provided with a blast furnace slag inlet (9) and a granulator (1), a condensation spray device (4) is arranged in the granulating and whitening tower (2), the upper part of the granulating and whitening tower (2) is provided with a steam outlet (10), a filter layer (7) and a filter pipe (8) are arranged in each of the first filtering and whitening pool (6) and the second filtering and whitening pool (16), and the steam outlet (10) is connected with the filter pipe (8) of the first filtering and whitening pool (6) and the filter pipe (8) of the second filtering and whitening pool (16) through a steam conveying pipeline (11). The blast furnace slag bottom filtering and whitening system adopts a double whitening process of spraying of a granulating tower and cooling of filter materials of a filtering and whitening tank, thoroughly eliminates harmful steam in the process of granulating the blast furnace slag, and achieves the purposes of real whitening elimination and environmental protection.)

1. The blast furnace slag bottom filtering and whitening system is characterized by comprising a granulating and whitening tower (2), a first filtering and whitening pool (6) and a second filtering and whitening pool (16), wherein a blast furnace slag inlet (9) and a granulator (1) are arranged at the lower part of the granulating and whitening tower (2), a condensation spray device (4) is arranged in the granulating and whitening tower (2), a steam outlet (10) is arranged at the upper part of the granulating and whitening tower (2), a filter layer (7) and a filter pipe (8) are arranged in each of the first filtering and whitening pool (6) and the second filtering and whitening pool (16), and the steam outlet (10) is connected with the filter pipe (8) of the first filtering and whitening pool (6) and the filter pipe (8) of the second filtering and whitening pool (16) through a steam conveying pipeline (11).

2. The blast furnace slag bottom filtration and white removal system according to claim 1, wherein a spray water collecting hopper (3), a steam outlet (10), a condensation spraying device (4), the spray water collecting hopper (3), a blast furnace slag inlet (9) and the granulator (1) are sequentially arranged from top to bottom in the granulation and white removal tower (2).

3. The blast furnace slag bottom filtration and white removal system according to claim 2, wherein a spray water inlet (12) and a collected water outlet (13) are arranged on the side wall of the granulation white removal tower (2), spray water can be supplied to the condensation spray device (4) through the spray water inlet (12), and water collected by the spray water collection hopper (3) can be discharged through the collected water outlet (13).

4. The blast furnace slag bottom leaching and white washing system according to claim 3, further comprising a first cooling tower (14) and a first water storage tank (15), wherein the water discharged from the collected water outlet (13) can enter the first cooling tower (14), the water cooled by the first cooling tower (14) can enter the first water storage tank (15), and the first water storage tank (15) can supply water to the spray water inlet (12).

5. The blast furnace slag bottom filtration and white removal system according to claim 1, wherein a steam blower (5) is arranged on the steam delivery pipeline (11), and steam discharged from the steam outlet (10) can enter the filter pipe (8) of the first filtration and white removal tank (6) or the filter pipe (8) of the second filtration and white removal tank (16) through the steam delivery pipeline (11).

6. The blast furnace slag bottom filtration and whitening system according to claim 1, characterized in that the first filtration and whitening tank (6) has the same structure as the second filtration and whitening tank (16), the filter pipe (8) is positioned in the filter layer (7) or below the filter layer (7), and the filter layer (7) contains filter materials with gradually increasing grain sizes from top to bottom.

7. The blast furnace slag bottom filtering and whitening system according to claim 1, characterized by further comprising a second cooling tower (17) and a second water storage tank (18), wherein the filter pipe (8) of the first filtering and whitening tank (6) and the filter pipe (8) of the second filtering and whitening tank (16) are both connected with the second cooling tower (17) through a drainage line (19), and water cooled by the second cooling tower (17) can enter the second water storage tank (18).

8. The bottom-filtering and white-removing system for blast furnace slag according to claim 7, characterized in that the lower part of the granulating and white-removing tower (2) is further provided with a granulated slag outlet (21), and the second water storage tank (18) can supply slag flushing water to the granulator (1).

9. The blast furnace slag bottom filtration and whitening system according to claim 8, characterized in that the slag outlet (21) is connected with the slag inlet of the first filtration and whitening tank (6) and the slag inlet of the second filtration and whitening tank (16) through a slag sluicing groove (22), the slag inlet of the first filtration and whitening tank (6) is positioned between the upper end surface of the first filtration and whitening tank (6) and the upper surface of the filter layer (7) of the first filtration and whitening tank (6), and the slag inlet of the second filtration and whitening tank (16) is positioned between the upper end surface of the second filtration and whitening tank (16) and the upper surface of the filter layer (7) of the second filtration and whitening tank (16).

10. The blast furnace slag bottom filtration and whitening system according to claim 9, characterized in that when steam discharged from the steam outlet (10) enters the filter pipe (8) of the first filtration and whitening pool (6) through the steam conveying pipeline (11), the granulated slag discharged from the granulated slag outlet (21) enters the second filtration and whitening pool (16) through the slag washing groove (22) and the granulated slag inlet of the second filtration and whitening pool (16) in sequence; when steam discharged from the steam outlet (10) enters the filtering pipe (8) of the second filtering and whitening pool (16) through the steam conveying pipeline (11), the water granulated slag discharged from the water granulated slag outlet (21) sequentially passes through the slag flushing channel (22) and the water granulated slag inlet of the first filtering and whitening pool (6) and enters the first filtering and whitening pool (6).

Technical Field

The invention relates to the field of metal smelting equipment, in particular to a bottom filtering and white removing system for blast furnace slag.

Background

High-temperature liquid slag (1350 ℃ -1500 ℃) is generated during blast furnace smelting, 7 hundred million tons of molten iron are produced in China every year, and 2.5 million tons of high-temperature liquid slag are generated. The slag is usually granulated at home and abroad by a precipitation filtration method (often called bottom filtration method) and a granulating process. The method comprises the steps of carrying out hydraulic slag flushing in front of a blast furnace, crushing slag by water quenching to obtain a slag-water mixture (often called water slag), enabling water slag to enter a filter tank through a slag flushing channel, filtering liquid water by a filter layer in the filter tank for recycling, leaving solid slag particles in the filter tank, and then grabbing, loading and transporting the slag particles by a bridge type grab crane.

The granulated slag process can generate a large amount of sulfur-containing steam (about 60-100 ℃) in the process of granulating the molten slag, the granulated slag steam has corrosiveness, the surrounding environment is polluted in the emission process, surrounding equipment is corroded, and meanwhile, the emitted steam can also corrode the blast furnace equipment to a certain extent due to the fact that the distance between the filter tank and the blast furnace is very close.

With the increasing environmental protection situation in China, the demand of iron and steel enterprises for the steam whitening technology of the water granulated slag process is more and more strong. Related research has been carried out for many years at home and abroad, and slag flushing steam is hopefully eliminated to realize steam whitening. For example, chinese patent CN 107815514 a, published as 2018, 3 and 20, discloses an apparatus and a method for recovering slag flushing water vapor and eliminating white fog, which first adopts a spray cooling mode to realize vapor recovery, and then utilizes hot blast furnace flue gas to heat steam to prevent white smoke generation. The method can effectively reduce partial steam emission, and the generation of white smoke can be prevented by utilizing the temperature-rising steam of the flue gas of the hot blast stove, but partial steam is finally discharged into the atmosphere, namely, the real and thorough white elimination can not be realized.

Disclosure of Invention

In order to realize real and thorough white elimination, the invention provides a blast furnace slag bottom filtering white elimination system, which can reduce the spray water amount of a granulation tower and fully play the characteristics of a filter material in an environment-friendly bottom filter, so that the filter material not only plays a role in filtering slag-water mixture, but also plays a role in eliminating white of steam through a backwashing system, and finally realizes cooling recovery and cyclic utilization of steam, thereby avoiding energy waste and playing a role in environmental protection.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a white system of blast furnace slag end filtration, including the pelletization white-removing tower, first filtration white-removing pool and second filtration white-removing pool, the lower part of pelletization white-removing tower is equipped with blast furnace slag entry and granulator, is equipped with the condensation spray set in the pelletization white-removing tower, and the upper portion of pelletization white-removing tower is equipped with the steam outlet, and first filtration white-removing pool and second filtration white-removing pool are equipped with filter layer and filter tube in each, and the steam outlet passes through the steam conveying pipeline and is connected with the filter tube of first filtration white-removing pool and the filter tube of second filtration white-removing pool.

The granulating and whiting-eliminating tower is also internally provided with a spray water collecting hopper, and a steam outlet, a condensation spraying device, the spray water collecting hopper, a blast furnace slag inlet and a granulator are sequentially arranged from top to bottom.

The side wall of the granulating and water-reducing tower is provided with a spray water inlet and a collected water outlet, spray water can be supplied to the condensation spraying device through the spray water inlet, and water collected by the spray water collecting hopper can be discharged through the collected water outlet.

The blast furnace slag bottom filtering and white matter eliminating system further comprises a first cooling tower and a first water storage tank, water discharged from a collected water outlet can enter the first cooling tower, water cooled by the first cooling tower can enter the first water storage tank, and the first water storage tank can supply water to the spray water inlet.

The steam conveying pipeline is provided with a steam fan, and steam discharged from the steam outlet can enter the filter pipe of the first filtering and white removing pool or the filter pipe of the second filtering and white removing pool through the steam conveying pipeline.

The structure of the first filtering and whitening tank is the same as that of the second filtering and whitening tank, the filtering pipe is positioned in the filtering layer or below the filtering layer, and the filtering layer contains filtering materials with gradually-increased grain sizes from top to bottom.

The blast furnace slag bottom filtering and whitening system further comprises a second cooling tower and a second water storage tank, wherein the filter pipe of the first filtering and whitening tank and the filter pipe of the second filtering and whitening tank are both connected with the second cooling tower through a drainage pipeline, and water cooled by the second cooling tower can enter the second water storage tank.

The lower part of the granulating and whitening tower is also provided with a granulated slag outlet, and the second water storage tank can supply slag flushing water to the granulator.

The granulating slag outlet is connected with the granulating slag inlet of the first filtering and whitening pool and the granulating slag inlet of the second filtering and whitening pool through a slag flushing channel, the granulating slag inlet of the first filtering and whitening pool is positioned between the upper end surface of the first filtering and whitening pool and the upper surface of the filter layer of the first filtering and whitening pool, and the granulating slag inlet of the second filtering and whitening pool is positioned between the upper end surface of the second filtering and whitening pool and the upper surface of the filter layer of the second filtering and whitening pool.

When steam discharged from the steam outlet enters a filter pipe of the first filtering and whitening pool through a steam conveying pipeline, water granulated slag discharged from the water granulated slag outlet sequentially passes through the slag flushing channel and a water granulated slag inlet of the second filtering and whitening pool to enter the second filtering and whitening pool; when steam discharged from the steam outlet enters the filtering pipe of the second filtering and whitening tank through the steam conveying pipeline, granulated slag discharged from the granulated slag outlet sequentially passes through the slag flushing channel and the granulated slag inlet of the first filtering and whitening tank to enter the first filtering and whitening tank.

The invention has the beneficial effects that:

1. the invention can fully utilize the condensing spray device and the filter material in the bottom filtering process to realize thorough steam white elimination treatment.

2. The invention can realize the complete recovery of the steam in the slag flushing and granulating process and realize the recycling of water resources.

3. The invention can improve the back washing efficiency of the filter material, improve the activity of the filter material and avoid the problems of easy hardening and short service life of the filter material.

4. The invention is not only suitable for the new construction project of the blast furnace, but also suitable for the environmental protection reconstruction of the existing blast furnace water slag system.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.

FIG. 1 is a schematic structural diagram of a bottom filtering and white removing system for blast furnace slag according to the present invention.

Fig. 2 is a sectional view taken along a-a in fig. 1.

Fig. 3 is a schematic view of a granulated absorption tower at the location of a spray water collection hopper.

FIG. 4 is a top view of the outer bucket body and water collection pipe.

Fig. 5 is a sectional view taken along the direction B-B in fig. 4.

1. A granulator; 2. granulating and eliminating the white tower; 3. a spray water collecting hopper; 4. a condensation spraying device; 5. a steam fan; 6. a first filtering and whitening pool; 7. a filter layer; 8. a filter tube; 9. a blast furnace slag inlet; 10. a steam outlet; 11. a vapor delivery line; 12. a spray water inlet; 13. a collected water outlet; 14. a first cooling tower; 15. a first water storage tank; 16. a second filtering and whitening pool; 17. a second cooling tower; 18. a second water storage tank; 19. a drain line; 21. a granulated slag outlet; 22. flushing a slag channel;

31. an inner barrel bucket; 32. an outer barrel bucket; 33. a water collection pipeline; 34. an outer bucket body; 35. an inner baffle ring; 36. a drain through hole; 37. an annular water collection tank; 38. condensed water and spray water; 39. a sulfur-containing vapor;

111. a first steam delivery leg; 112. a second steam delivery leg; 113. a main steam conveying line.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

A blast furnace slag bottom filtering and whitening system comprises a granulating and whitening tower 2, a first filtering and whitening pool 6 and a second filtering and whitening pool 16, wherein the lower part of the granulating and whitening tower 2 is provided with a blast furnace slag inlet 9 and a granulator 1, a condensing and spraying device 4 is arranged in the granulating and whitening tower 2, the upper part of the granulating and whitening tower 2 is provided with a steam outlet 10, a filtering layer 7 and a filtering pipe 8 are arranged in each of the first filtering and whitening pool 6 and the second filtering and whitening pool 16, and the steam outlet 10 is connected with the filtering pipe 8 of the first filtering and whitening pool 6 and the filtering pipe 8 of the second filtering and whitening pool 16 through a steam conveying pipeline 11, as shown in figure 1.

The steam outlet 10 is connected with the filtering pipe 8 of the first filtering and bleaching tank 6 and the filtering pipe 8 of the second filtering and bleaching tank 16 through a steam conveying pipeline 11, and the residual sulfur-containing steam which is not condensed is discharged from the steam outlet 10 and then enters the filtering pipe 8 through the steam conveying pipeline 11, namely, a small part of steam which is not condensed by the condensing and spraying device is introduced into the bottom of the bleaching tank. Therefore, not only is the thorough steam whitening treatment realized, but also the backwashing on the filter material is carried out by using the steam firstly and then the backwashing on the filter material is carried out by using the water, so that the backwashing efficiency on the filter material can be improved, the activity of the filter material is improved, and the problems of easy hardening and short service life of the filter material are avoided.

In this embodiment, the blast furnace slag inlet 9 is provided vertically corresponding to the granulator 1, and the condensation shower device 4 is provided between the blast furnace slag inlet 9 and the steam outlet 10. The granulating and whitening tower 2 is also internally provided with a spray water collecting hopper 3, the spray water collecting hopper 3 is positioned between the condensation spray device 4 and the blast furnace slag inlet 9, and the steam outlet 10, the condensation spray device 4, the spray water collecting hopper 3, the blast furnace slag inlet 9 and the granulator 1 are sequentially arranged from top to bottom.

The spray water collecting bucket 3 can be a product in the prior art, or in the invention, the spray water collecting bucket 3 comprises an inner barrel bucket 31, an outer barrel bucket 32 and a water collecting pipeline 33, the inner barrel bucket 31 is sleeved in the outer barrel bucket 32, and an annular channel is formed between the inner barrel bucket 31 and the outer barrel bucket 32. The axial line of the inner barrel bucket 31, the axial line of the outer barrel bucket 32 and the axial line of the granulating and whitening tower 2 are coincident. Interior barrel fill 31 is the circular cone tubular structure of top end down bottom end up, and outer barrel fill 32 contains outer bucket body 34 and interior fender ring 35, and in the lower extreme of outer bucket body 34 was located to interior fender ring 35 cover, the axis of interior fender ring 35 and the coincidence of the axis of outer bucket body 34, outer bucket body 34 is the circular cone tubular structure of top end bottom end up down, through annular connecting plate sealing connection between the lower extreme of outer bucket body 34 and the lower extreme of interior fender ring 35, forms annular water catch bowl 37 between outer bucket body 34 and the interior fender ring 35.

The upper end of the inner bucket 31 is higher than the upper end of the outer bucket 32, and the lower end of the inner bucket 31 is flush with the lower end of the outer bucket 32. The upper and lower both ends of inner barrel fill 31 are open state, and the upper and lower both ends of outer bucket body 34 are open state, and collection water pipe way 33 is horizontal state, and the lower extreme that inner barrel was fought 31 and the lower extreme that outer barrel was fought 32 all are connected with collection water pipe way 33, and the inside of inner barrel fill 31 and the inside intercommunication of collecting water pipe way 33, be equipped with drainage through hole 36 in the annular connecting plate, annular water catch bowl 37 passes through drainage through hole 36 and the inside intercommunication of collecting water pipe way 33.

The outer diameter of the upper end of the inner barrel bucket 31 is smaller than the inner diameter of the granulating and whitening tower 2, and an annular space is formed between the upper end of the inner barrel bucket 31 and the inner surface of the granulating and whitening tower 2. The outer diameter of the lower end of the inner barrel bucket 31 is smaller than the inner diameter of the inner retaining ring 35, the outer diameter of the upper end of the outer bucket body 34 is equal to the inner diameter of the granulating and whitening tower 2, the outer bucket body 34 is fixedly connected with the granulating and whitening tower 2, and the lower end of the outer bucket body 34 is flush with the lower end of the inner retaining ring 35, namely the lower end of the inner barrel bucket 31, the lower end of the outer bucket body 34 and the lower end of the inner retaining ring 35 are flush. One end of the water collecting pipeline 33 is positioned outside the granulating and whitening tower 2, the outer diameter of the water collecting pipeline 33 is smaller than the inner diameter of the inner baffle ring 35, and one end of the water collecting pipeline 33 is a water collecting outlet 13, as shown in fig. 1 to 5.

During use, the sulfur-containing steam 39 moves upward and sequentially passes through the lower end of the inner baffle ring 35, the annular channel and the annular space, and most of the sulfur-containing steam becomes condensed water under the action of atomized spray water. The condensed water and a part of the shower water 38 fall into the lower end of the inner bucket 31, then enter the collected water pipe 33 and are discharged from the collected water outlet 13. The condensed water and another portion of the shower water 38 fall into an annular water collection trough 37 at the lower end of the outer bucket 32, then enter the collection water conduit 33 and are discharged from the collection water outlet 13, as shown in fig. 3.

In the embodiment, the side wall of the granulation and white reduction tower 2 is provided with a spray water inlet 12 and a collected water outlet 13, the spray water inlet 12 is connected with the condensation spray device 4, and spray water can be supplied to the condensation spray device 4 through the spray water inlet 12. The position of the collected water outlet 13 corresponds to the position of the spray water collecting hopper 3, and the water collected by the spray water collecting hopper 3 can be discharged out of the granulating and whitening tower 2 through the collected water outlet 13. The lower part of the granulating and whitening tower 2 is also provided with a grain slag outlet 21.

In this embodiment, the condensation spraying device 4 comprises at least one layer of high-pressure atomizing nozzles, and the condensation spraying device 4 can spray cold water to condense high-temperature sulfur-containing vapor to form condensed water, which will be collected in the collecting area of the spray water collecting hopper 3. The steam outlet 10 is positioned at the top of the granulation and white elimination tower 2, the steam conveying pipeline 11 comprises a steam conveying main line 113, a first steam conveying branch line 111 and a second steam conveying branch line 112, the steam conveying main line 113 is provided with a steam fan 5, and the first steam conveying branch line 111 and the second steam conveying branch line 112 are provided with valves, as shown in fig. 1.

The steam blower 5 is used for leading the residual sulfur-containing steam discharged from the steam outlet 10 to enter the filter pipe 8 of the first filtering and whitening tank 6 or the filter pipe 8 of the second filtering and whitening tank 16 or simultaneously enter the filter pipe 8 of the first filtering and whitening tank 6 and the filter pipe 8 of the second filtering and whitening tank 16 through a steam conveying pipeline 11. Preferably, the steam blower 5 is used to accelerate the remaining sulfur-containing steam exiting the steam outlet 10 through the steam delivery line 11 into the filter tubes 8 of the first filtering and whitening tank 6 or into the filter tubes 8 of the second filtering and whitening tank 16.

In this embodiment, the blast furnace slag bottom filtering and white removing system further comprises a first cooling tower 14 and a first water storage tank 15 which are connected in sequence, the collected water outlet 13 is connected with an inlet of the first cooling tower 14 through a drainage pipeline, water discharged from the collected water outlet 13 can enter the first cooling tower 14 for cooling, water cooled by the first cooling tower 14 can enter the first water storage tank 15, an outlet of the first water storage tank 15 is connected with the spray water inlet 12 through a water supply pipeline, and the first water storage tank 15 can supply spray water to the spray water inlet 12.

In this embodiment, the wall of the filtering pipe 8 has a plurality of filtering through holes, and the residual sulfur-containing vapor enters the filtering pipe 8, passes through the filtering through holes, enters the filtering layer 7, and continues to move upward, and in this process, the residual sulfur-containing vapor fully contacts (i.e., backflushes) the filtering material in the filtering layer 7, as shown in fig. 2. The first filtering and whitening tank 6 and the second filtering and whitening tank 16 have the same structure, the structure of the first filtering and whitening tank 6 is basically the same as that of the existing filtering tank, the first filtering and whitening tank 6 and the second filtering and whitening tank 16 both contain deposition water, the filtering pipe 8 is positioned in the filtering layer 7 or below the filtering layer 7, preferably, the filtering pipe 8 is positioned at the lower part of the filtering layer 7, and the filtering layer 7 contains filtering materials with gradually-increased grain sizes from top to bottom. The sedimentation water in the first filtering and whitening pool 6 and the second filtering and whitening pool 16 can enter the interior of the filter pipe 8 through the filter layer 7 and the filter pipe 8.

In this embodiment, the blast furnace slag bottom filtering and whitening system further comprises a second cooling tower 17 and a second water storage tank 18 which are sequentially connected, the filter pipe 8 of the first filtering and whitening tank 6 and the filter pipe 8 of the second filtering and whitening tank 16 are both connected with the inlet of the second cooling tower 17 through a water discharge pipeline 19, the water in the filter pipe 8 of the first filtering and whitening tank 6 and the water in the filter pipe 8 of the second filtering and whitening tank 16 can both enter the second cooling tower 17 through the water discharge pipeline 19 for cooling, and the water cooled by the second cooling tower 17 can enter the second water storage tank 18.

In this embodiment, the granulated whiting tower 2 is further provided at a lower portion thereof with a granulated slag outlet 21, the second water storage tank 18 is communicated with an inlet of the granulator 1 through a water supply line, and the second water storage tank 18 is capable of supplying slag flushing water into the granulator 1. The first steam supply branch line 111 is connected to one end of the filter pipe 8 of the first filtering and whitening tank 6, and the drain line 19 is connected to the other end of the filter pipe 8 of the first filtering and whitening tank 6. The second steam delivery branch 112 is connected to one end of the filter tubes 8 of the second filtering and whitening tank 16 and the drain line 19 is connected to the other end of the filter tubes 8 of the second filtering and whitening tank 16, as shown in fig. 1.

In this embodiment, the granulated slag outlet 21 is connected to the granulated slag inlet of the first filtering and whitening tank 6 and the granulated slag inlet of the second filtering and whitening tank 16 through the slag flushing channel 22, the granulated slag inlet of the first filtering and whitening tank 6 is located between the upper end surface of the first filtering and whitening tank 6 and the upper surface of the filter layer 7 of the first filtering and whitening tank 6, and the granulated slag inlet of the second filtering and whitening tank 16 is located between the upper end surface of the second filtering and whitening tank 16 and the upper surface of the filter layer 7 of the second filtering and whitening tank 16.

In the present embodiment, the first filtering and whitening pool 6 and the second filtering and whitening pool 16 alternately exert filtering and whitening effects. That is, when the steam (the remaining part of sulfur-containing steam) discharged from the steam outlet 10 enters the filtering pipe 8 of the first filtering and whitening pool 6 through the steam conveying pipeline 11, the granulated slag discharged from the granulated slag outlet 21 sequentially passes through the slag flushing channel 22 and the granulated slag inlet of the second filtering and whitening pool 16 to enter the second filtering and whitening pool 16, at this time, the first filtering and whitening pool 6 acts as whitening, and the second filtering and whitening pool 16 acts as filtering. When steam (the rest of sulfur-containing steam) discharged from the steam outlet 10 enters the filtering pipe 8 of the second filtering and whitening pool 16 through the steam conveying pipeline 11, the granulated slag discharged from the granulated slag outlet 21 sequentially passes through the slag flushing channel 22 and the granulated slag inlet of the first filtering and whitening pool 6 to enter the first filtering and whitening pool 6, at the moment, the first filtering and whitening pool 6 is used for filtering, and the second filtering and whitening pool 16 is used for whitening.

The working process of the blast furnace slag bottom filtering and white removing system is described below.

High-temperature molten slag (1350-1500 ℃) enters the granulating and whitening tower 2 from a blast furnace molten slag inlet 9, and a large amount of high-speed granulating water (about 40-45 ℃) is sprayed out from the granulator 1 and enters the granulating and whitening tower 2. In the granulating and whitening tower 2, the high-temperature molten slag is granulated under the action of granulating water, and a slag-water mixture and a large amount of sulfur-containing steam (about 80-100 ℃) move upwards.

The condensation spray device 4 sprays spray water (about 40-45 ℃) to form an atomized state in the granulating and whitening tower 2, and the atomized spray water is uniformly distributed in the inner space of the granulating and whitening tower 2. This contain sulphur steam upwards passes spray water and collects 3 entering atomized water regions of fighting, and most contain sulphur steam becomes the comdenstion water under atomized spray water's effect, and this comdenstion water falls into spray water collection of condensation spray set 4 below with spray water and fights 3 together. The water collected by the spray water collecting hopper 3 (i.e., the above-described condensed water and spray water) is discharged from the collected water outlet 13 out of the granulated absorption tower 2.

The water discharged from the collected water outlet 13 may be sent to a first cooling tower 14, the first cooling tower 14 cools the water and then sends the cooled water to a first water storage tank 15, and the first water storage tank 15 may supply water to the condensation shower device 4.

The residual part of the sulfur-containing steam not condensed by the atomized shower water is guided by the steam blower 5 through the first steam branch line 111 into the filter pipes 8 of the first filtering and bleaching tank 6 (at this time, the second steam branch line 112 is in an off state).

The residual part of sulfur-containing steam is discharged from the filtering through holes of the filtering pipes 8 of the first filtering and whitening tank 6 and upwards enters the filtering layer 7 of the first filtering and whitening tank 6, the residual part of sulfur-containing steam moves upwards to backwash the filtering materials of the filtering layer 7, the first filtering and whitening tank 6 contains deposition water, the water level of the deposition water is generally positioned between the upper surface of the filtering layer 7 and the upper end surface of the tank body of the first filtering and whitening tank 6, and after the residual part of sulfur-containing steam is discharged from the filtering through holes of the filtering pipes 8 and enters the first filtering and whitening tank 6, the deposition water can completely absorb the residual part of sulfur-containing steam, so that the real thorough whitening is realized.

The water (flushing slag water) in the filter pipe 8 of the second filtering and whitening tank 16 sequentially passes through the drainage pipeline 19, the second cooling tower 17 and the second water storage tank 18 and then enters the granulator 1 of the granulating and whitening tower 2, the flushing slag water flushes the slag water mixture out of the granulating and whitening tower 2 from the slag outlet 21 at the lower part of the granulating and whitening tower 2, and the slag water mixture and the flushing slag water sequentially pass through the flushing slag channel 22 and the slag inlet of the second filtering and whitening tank 16 and enter the second filtering and whitening tank 16.

After a certain period of operation, the steam blower 5 directs the remaining part of the sulfur-containing steam that is not condensed by the atomized spray water into the filter tubes 8 of the second filtering and bleaching tank 16 through the second steam delivery branch line 112 (at this time, the first steam delivery branch line 111 is in an off state).

The residual sulfur-containing steam is discharged from the filtering through holes of the filtering pipes 8 of the second filtering and whitening tank 16 and upwards enters the filtering layer 7 of the second filtering and whitening tank 16, the residual sulfur-containing steam moves upwards to backwash the filtering materials of the filtering layer 7, the second filtering and whitening tank 16 contains deposition water, the water level of the deposition water is generally positioned between the upper surface of the filtering layer 7 and the upper end surface of the tank body of the second filtering and whitening tank 16, and after the residual sulfur-containing steam is discharged from the filtering through holes of the filtering pipes 8 and enters the second filtering and whitening tank 16, the deposition water can completely absorb the residual sulfur-containing steam, so that the real thorough whitening is realized.

The water (flushing slag water) in the filter pipe 8 of the first filtering and whitening tank 6 sequentially passes through the drainage pipeline 19, the second cooling tower 17 and the second water storage tank 18 and then enters the granulator 1 of the granulating and whitening tower 2, the flushing slag water flushes the slag-water mixture out of the granulating and whitening tower 2 from the slag outlet 21 at the lower part of the granulating and whitening tower 2, and the slag-water mixture and the flushing slag water sequentially pass through the flushing slag channel 22 and the slag inlet of the first filtering and whitening tank 6 and enter the first filtering and whitening tank 6.

In the invention, the first filtering and whitening pool 6 and the second filtering and whitening pool 16 have the same structure and are arranged side by side. When a filtering and whitening tank receives the slag-water mixture, the filtering and whitening tank is used as a filtering tank for separating slag particles and slag flushing water, the slag flushing water is guided to a cooling tower through a filtering material and a filtering pipe, and the combination of the filtering material and the filtering pipe is called as a filtering system; and the other filtering and whitening tank is used as a whitening tank, a steam fan leads a small part of steam which is not condensed in the granulating and whitening tower after passing through the condensing and spraying device to the whitening tank, the steam enters the whitening tank for cleaning slag particles from the bottom of the filter pipe and the filter material upwards to perform backwashing on the filter material, and the combination of the filter material and the filter pipe is called as a backwashing system. The filter material is backwashed by water after the backwashing of the steam on the filter material is finished, so that the activity of the filter material is improved, and the problems of easy hardening and short service life of the filter material are solved.

The first filtering and whitening pool 6 and the second filtering and whitening pool 16 are alternately and circularly used, namely one filtering and whitening pool is used as a filtering pool, and the other filtering and whitening pool is used as a whitening pool, so that the filtering treatment of the slag-water mixture, the whitening treatment of steam and the back flushing treatment of the filter material are realized. The cooling tower and the water storage tank for collecting water and filtering water can be shared or can be separately arranged according to the field situation.

The invention makes full use of the filter material and the filter pipe in the bottom filtration process, and leads a small part of steam which is not condensed by the condensing and spraying device to the back washing system in the steam whitening process, thereby not only realizing the thorough steam whitening treatment, but also firstly carrying out back washing on the filter material by using the steam and then carrying out back washing on the filter material by using water, improving the back washing efficiency on the filter material, improving the activity of the filter material, and avoiding the problems of easy hardening and short service life of the filter material.

The invention can realize the complete recovery of the steam in the slag flushing and granulating process and realize the recycling of water resources; the invention only adds the steam fan on the basis of the original slag bottom filtration process, is not only suitable for the new construction project of the blast furnace, but also suitable for the environmental protection reconstruction of the existing blast furnace slag system, and has great significance for the environmental protection production of the blast furnace slag system.

The above description is only exemplary of the invention and should not be taken as limiting the scope of the invention, so that the invention is intended to cover all modifications and equivalents of the embodiments described herein. In addition, the technical features and the technical schemes, and the technical schemes can be freely combined and used.