CN110975496A - Environment-friendly white-removing system for blast furnace granulated slag - Google Patents
Environment-friendly white-removing system for blast furnace granulated slag Download PDFInfo
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- CN110975496A CN110975496A CN201911355300.0A CN201911355300A CN110975496A CN 110975496 A CN110975496 A CN 110975496A CN 201911355300 A CN201911355300 A CN 201911355300A CN 110975496 A CN110975496 A CN 110975496A
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- 239000002893 slag Substances 0.000 title claims abstract description 130
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 201
- 238000001914 filtration Methods 0.000 claims abstract description 192
- 230000002087 whitening effect Effects 0.000 claims abstract description 171
- 239000007921 spray Substances 0.000 claims abstract description 53
- 238000001816 cooling Methods 0.000 claims abstract description 33
- 238000009833 condensation Methods 0.000 claims abstract description 16
- 230000005494 condensation Effects 0.000 claims abstract description 16
- 238000005507 spraying Methods 0.000 claims abstract description 11
- 238000011010 flushing procedure Methods 0.000 claims description 29
- 238000003860 storage Methods 0.000 claims description 18
- 238000002347 injection Methods 0.000 claims description 16
- 239000007924 injection Substances 0.000 claims description 16
- 230000003179 granulation Effects 0.000 claims description 8
- 238000005469 granulation Methods 0.000 claims description 8
- 238000003379 elimination reaction Methods 0.000 claims description 6
- 238000010791 quenching Methods 0.000 claims description 3
- 230000000171 quenching effect Effects 0.000 claims description 3
- 239000008400 supply water Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 32
- 238000000034 method Methods 0.000 abstract description 16
- 239000006260 foam Substances 0.000 abstract description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 33
- 229910052717 sulfur Inorganic materials 0.000 description 31
- 239000011593 sulfur Substances 0.000 description 31
- 238000011001 backwashing Methods 0.000 description 12
- 239000007789 gas Substances 0.000 description 9
- 239000000203 mixture Substances 0.000 description 9
- 230000007613 environmental effect Effects 0.000 description 8
- 230000008021 deposition Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000005453 pelletization Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000008030 elimination Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 238000004061 bleaching Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010612 desalination reaction Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 241000276489 Merlangius merlangus Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/60—Combinations of devices covered by groups B01D46/00 and B01D47/00
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Manufacture Of Iron (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a blast furnace granulated slag environment-friendly whitening system which comprises a granulating whitening tower (2), a first filtering whitening pool (6) and a second filtering whitening pool (16), wherein the granulating whitening tower (2) is internally provided with a condensation spray device (4) and a spray water collecting hopper (3) which are arranged up and down, a filter layer (7) and a filter pipe (8) are respectively arranged in the first filtering whitening pool (6) and the second filtering whitening pool (16), a steam outlet (10) is connected with the filter pipe (8) of the first filtering whitening pool (6) and the filter pipe (8) of the second filtering whitening pool (16) through a steam conveying pipeline (11), and a foam remover (24) and a steam fan (5) are sequentially arranged on the steam conveying pipeline (11). The environment-friendly white-removing system for the blast furnace granulated slag adopts a double white-removing process of spraying by the granulating tower and cooling by the filter material of the filtering white-removing tank, thoroughly eliminates harmful steam in the granulating treatment process of the blast furnace granulated slag, and achieves the purposes of real white-removing and environment-friendly.
Description
Technical Field
The invention relates to the field of metal smelting equipment, in particular to a blast furnace granulated slag environment-friendly whitening system.
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 the blast furnace granulated slag environment-friendly white elimination system which can reduce the spraying water amount of the granulation tower and fully play the characteristics of the filter material in the 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 back washing system, and finally realizes cooling recovery and cyclic utilization of steam, thereby avoiding energy waste and playing a role in environment protection.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a blast furnace grain slag environmental protection white-removing system, including the pelletization white-removing tower, first filtration white-removing pool and second filtration white-removing pool, the lower part of the pelletization white-removing tower is equipped with blast furnace slag entry and granulator, the pelletization white-removing tower contains the condensation spray set and the spray water collection fill that set up from top to bottom, the upper portion of the pelletization white-removing tower is equipped with steam outlet and gas injection mouth, first filtration white-removing pool and second filtration white-removing pool are all equipped with filter layer and filter tube, steam outlet passes through the steam conveying line and is connected with the filter tube of first filtration white-removing pool and the filter tube of second filtration white-removing pool, be equipped with demister and steam fan on the steam conveying line in proper order.
The steam outlet, the gas injection port, the condensation spraying device, the spray water collecting hopper, the blast furnace slag inlet and the granulator are sequentially arranged from top to bottom, the air fan is connected outside the gas injection port, and air can be injected into the upper end of the granulating and whitening tower through the gas injection port.
The spray water collecting bucket comprises an inner bucket, an outer bucket and a water collecting pipeline, the inner bucket is sleeved in the outer bucket, an annular channel is formed between the inner bucket and the outer bucket, the outer bucket comprises an outer bucket body and an inner retaining ring, the lower end of the outer bucket body is connected with the lower end of the inner retaining ring through an annular connecting plate, and an annular water collecting tank is formed between the outer bucket body and the inner retaining ring.
The upper end that the inner drum was fought is higher than the upper end that the urceolus was fought, and the lower extreme that the inner drum was fought flushes with the lower extreme that the urceolus was fought, and the upper and lower both ends that the inner drum was fought are open state, and the collection water pipeline is the horizontality, and the lower extreme that the inner drum was fought and the lower extreme that the urceolus was fought all with collect the water pipe and be connected, the inside of inner drum fill and the inside intercommunication of collecting the water pipe, be equipped with drainage through hole in the annular connecting plate, annular water catch bowl passes.
The outer diameter of the upper end of the inner barrel bucket is smaller than the inner diameter of the granulating and whitening tower, the outer diameter of the lower end of the inner barrel bucket is smaller than the inner diameter of the inner baffle ring, the outer diameter of the upper end of the outer bucket body is equal to the inner diameter of the granulating and whitening tower, the lower end of the outer bucket body is flush with the lower end of the inner baffle ring, one end of the water collecting pipeline is positioned outside the granulating and whitening tower, and the outer diameter of the water collecting pipeline is smaller than the inner diameter of the inner baffle ring.
Be equipped with spray water entry, collection water export and steam return opening on the lateral wall of pelletization white tower, can supply spray water to condensation spray set through spray water entry, can collect the log raft play that the fill was collected with spray water through collecting the water export, steam return opening is located spray water and collects the below of fighting, and steam conveying pipeline returns the pipeline and is connected with steam return opening through steam.
This white system of blast furnace grain slag environmental protection disappears still includes first cooling tower and first tank, collects the discharged water of water outlet and can get into first cooling tower, and the hydroenergy after the cooling of first cooling tower can get into first tank, and first tank can supply water to the shower water entry.
The environment-friendly blast furnace granulated slag white-eliminating system further comprises a second cooling tower and a second water storage tank, wherein the filter pipe of the first filtering white-eliminating tank and the filter pipe of the second filtering white-eliminating tank are both connected with the second cooling tower through a drainage pipeline, water cooled by the second cooling tower can enter the second water storage tank, a granulated slag-eliminating tower is further 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 the environment-friendly white-eliminating system for the blast furnace granulated slag.
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; 23. a valve; 24. a demister; 25. an air blower; 26. a gas injection port; 27. a steam return port; 28. a vapor return line;
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.
The environment-friendly blast furnace slag whitening system comprises a granulating whitening tower 2, a first filtering whitening pool 6 and a second filtering whitening pool 16, wherein a blast furnace slag inlet 9 and a granulator 1 are arranged at the lower part of the granulating whitening tower 2, a condensation spray device 4 and a spray water collecting hopper 3 which are arranged up and down are arranged in the granulating whitening tower 2, a steam outlet 10 and a gas injection port 26 are arranged at the upper part of the granulating whitening tower 2, a filter layer 7 and a filter pipe 8 are arranged in each of the first filtering whitening pool 6 and the second filtering whitening pool 16, the steam outlet 10 is connected with the filter pipe 8 of the first filtering whitening pool 6 and the filter pipe 8 of the second filtering whitening pool 16 through a steam conveying pipeline 11, and a foam remover 24 and a steam fan 5 are sequentially arranged on the 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 whitening tank 6 and the filtering pipe 8 of the second filtering and whitening tank 16 through a steam conveying pipeline 11, and the rest of sulfur-containing steam which is not condensed is discharged from the steam outlet 10, defoamed by a demister 24 and enters the filtering pipe 8 through the steam conveying pipeline 11, namely, a small part of steam which is not condensed by a condensing and spraying device is introduced into the bottom of the whitening 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 and the granulator 1 are arranged in a vertically corresponding manner, the steam outlet 10, the gas injection port 26, 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 gas injection port 26 is externally connected with an air fan 25, air can be injected into the upper end of the granulation and whitening tower 2 through the gas injection port 26, and the negative pressure value at the top of the granulation and whitening tower 2 can be adjusted by adjusting the inflow of the air.
In this embodiment, the side wall of the granulation and white-light-eliminating tower 2 is further provided with a spray water inlet 12, a collected water outlet 13 and a steam return port 27, and the steam delivery line 11 is connected with the steam return port 27 through a steam return line 28. Air can be injected into the upper end of the granulated whitening tower 2 through the air injection port 26 and the air blower 25, and the negative pressure value at the top of the granulated whitening tower 2 can be adjusted by adjusting the injection amount of the air. The condensation shower 4 can be supplied with shower water through the shower water inlet 12, and the water collected by the shower water collection funnel 3 can be discharged through the collection water outlet 13.
The steam return port 27 is positioned below the spray water collecting hopper 3, and the steam in the steam conveying pipeline 11 can be returned to the granulating and whitening tower 2 through the steam return pipeline 28 for re-spraying and condensation. That is, the remaining part of the sulfur-containing steam can enter the filtering pipe 8 of the blank pool (the first filtering blank pool 6 or the second filtering blank pool 16), or the remaining part of the sulfur-containing steam can enter the granulating blank tower 2, and the steam conveying pipeline 11 and the steam return pipeline 28 are both provided with valves 23 to control the flow direction of the sulfur-containing steam in the steam conveying pipeline 11.
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 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 located at the top of the granulation and whitening tower 2, and the steam conveying line 11 comprises a steam conveying main line 113, a first steam conveying branch line 111 and a second steam conveying branch line 112.
Specifically, the demister 24 and the steam blower 5 are both located on the steam delivery main line 113, the steam delivery main line 113 is connected to the steam return port 27 through the steam return line 28, the steam delivery main line 113 is connected to the filter pipe 8 of the first filtration and desalination tank 6 through the first steam delivery branch line 111, and the steam delivery main line 113 is connected to the filter pipe 8 of the second filtration and desalination tank 16 through the second steam delivery branch line 112. The vapor return line 28, the first vapor transfer branch 111, and the second vapor transfer branch 112 are connected in parallel, and valves are disposed on the vapor return line 28, the first vapor transfer branch 111, and the second vapor transfer branch 112, and the flow direction of the sulfur-containing vapor in the vapor transfer line 11 is controlled by the valves, as shown in fig. 1.
The steam fan 5 is used for leading 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 or return to the granulating and whitening tower 2 through a steam conveying pipeline 11. Preferably, the steam blower 5 is used to accelerate the remaining sulfur-containing steam exiting from the steam outlet 10 through the steam delivery line 11 into the filter pipe 8 of the first filtering and whitening tank 6 or into the filter pipe 8 of the second filtering and whitening tank 16 or back into the granulating and whitening tower 2.
In this embodiment, this white system of blast furnace grain slag environmental protection disappears still includes first cooling tower 14 and the first tank 15 that connects gradually, collects water outlet 13 and passes through the entry linkage of water drainage line with first cooling tower 14, collects water outlet 13 exhaust water and can get into first cooling tower 14 and cool off, the hydroenergy after first cooling tower 14 cools off can get into first tank 15, the export of first tank 15 passes through the water supply line and is connected with shower water inlet 12, first tank 15 can supply shower water to shower 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, this blast furnace grain slag environmental protection white system that disappears still includes second cooling tower 17 and the second tank 18 that connects gradually, and the filter tube 8 of the first filtration white pond 6 that disappears and the filter tube 8 of the second filtration white pond 16 that disappears all pass through drain line 19 and the entry linkage of second cooling tower 17, and the water in the filter tube 8 of the first filtration white pond 6 that disappears and the water in the filter tube 8 of the second filtration white pond 16 that disappears all can get into second cooling tower 17 through drain line 19 and cool off, and the water after the cooling of second cooling tower 17 can get into second 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. Alternatively, the steam (the remaining part of the sulfur-containing steam described below) discharged from the steam outlet 10 is returned to the granulating and bleaching tower 2 through the steam transport main line 113 and the steam return line 28 in this order.
The working process of the blast furnace granulated slag environment-friendly whitening 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 steam blower 5 introduces the residual part of the sulfur-containing steam which is not condensed by the atomized shower water into the steam delivery main line 113, the residual part of the sulfur-containing steam enters the demister 24 for defoaming, air can be injected into the upper end of the granulation and whitening tower 2 through the air injection port 26 and the air blower 25, and the negative pressure value at the top of the granulation tower can be adjusted by adjusting the inflow amount of the air.
The steam blower 5 directs the remaining portion of the sulfur-containing steam that is not condensed by the atomized spray water through the first steam delivery branch 111 into the filter tubes 8 of the first filtering and bleaching tank 6 (at which time the second steam delivery branch 112 and the steam return line 28 are both in an off state).
The residual sulfur-containing steam treated by the demister 24 is discharged from the filtering through hole of the filtering pipe 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 sulfur-containing steam moves upwards to backwash the filtering material 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 sulfur-containing steam is discharged from the filtering through hole of the filtering pipe 8 and enters the first filtering and whitening tank 6, the deposition water completely absorbs the residual sulfur-containing steam, so that the real complete 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 portion of the sulfur-containing steam that has not been condensed by the atomized spray water through the second steam delivery branch line 112 into the filter tubes 8 of the second filtering and bleaching tank 16 (in this case, both the first steam delivery branch line 111 and the steam return line 28 are in the off state).
The residual sulfur-containing steam treated by the demister 24 is discharged from the filtering through hole of the filtering pipe 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 material 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 hole of the filtering pipe 8 and enters the second filtering and whitening tank 16, the deposition water completely absorbs the residual sulfur-containing steam, so that the real complete 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.
Alternatively, the remaining part of the sulfur-containing steam treated by the demister 24 enters the lower portion of the granulated whitening tower 2 sequentially through the steam conveying main line 113 and the steam return line 28.
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.
Claims (10)
1. An environment-friendly white-eliminating system for blast furnace granulated slag, which is characterized by comprising a granulating white-eliminating tower (2), the first filtering and white-light eliminating pool (6) and the second filtering and white-light eliminating pool (16), the lower part of the granulating and white-light eliminating tower (2) is provided with a blast furnace slag inlet (9) and a granulator (1), the granulating and white-light eliminating tower (2) is internally provided with a condensation spray device (4) and a spray water collecting hopper (3) which are arranged up and down, the upper part of the granulating and white-light eliminating tower (2) is provided with a steam outlet (10) and a gas injection port (26), the first filtering and white-light eliminating pool (6) and the second filtering and white-light eliminating pool (16) are respectively internally provided with a filter layer (7) and a filter pipe (8), the steam outlet (10) is connected with the filter pipe (8) of the first filtering and white-light eliminating pool (6) and the filter pipe (8) of the second filtering and white-light eliminating pool (16) through a steam conveying pipeline (11), and the steam conveying pipeline (11) is sequentially provided with.
2. The environment-friendly white slag quenching system for blast furnace granulated slag according to claim 1, wherein the steam outlet (10), the gas injection port (26), the condensation spraying device (4), the spray water collecting hopper (3), the blast furnace molten slag inlet (9) and the granulator (1) are sequentially arranged from top to bottom, the gas injection port (26) is externally connected with an air fan (25), and air can be injected into the upper end of the granulation white slag quenching tower (2) through the gas injection port (26).
3. The blast furnace granulated slag environment-friendly whitening reduction system according to claim 1, wherein the spray water collecting hopper (3) comprises an inner barrel hopper (31), an outer barrel hopper (32) and a water collecting pipeline (33), the inner barrel hopper (31) is sleeved in the outer barrel hopper (32), an annular channel is formed between the inner barrel hopper (31) and the outer barrel hopper (32), the outer barrel hopper (32) comprises an outer hopper body (34) and an inner retaining ring (35), the lower end of the outer hopper body (34) is connected with the lower end of the inner retaining ring (35) through an annular connecting plate, and an annular water collecting tank (37) is formed between the outer hopper body (34) and the inner retaining ring (35).
4. The environment-friendly white-eliminating system for blast furnace granulated slag according to claim 3, wherein the upper end of the inner barrel bucket (31) is higher than the upper end of the outer barrel bucket (32), the lower end of the inner barrel bucket (31) is flush with the lower end of the outer barrel bucket (32), both the upper end and the lower end of the inner barrel bucket (31) are in an open state, both the upper end and the lower end of the outer barrel bucket (34) are in an open state, the water collecting pipeline (33) is in a horizontal state, both the lower end of the inner barrel bucket (31) and the lower end of the outer barrel bucket (32) are connected with the water collecting pipeline (33), the interior of the inner barrel bucket (31) is communicated with the interior of the water collecting pipeline (33), the annular connecting plate is internally provided with a water drainage through hole (36), and the annular water collecting tank (37) is communicated with the interior of the water collecting pipeline (33.
5. The blast furnace granulated slag environment-friendly whitening system as claimed in claim 4, wherein the outer diameter of the upper end of the inner barrel bucket (31) is smaller than the inner diameter of the granulating 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 baffle ring (35), the outer diameter of the upper end of the outer bucket body (34) is equal to the inner diameter of the granulating whitening tower (2), the lower end of the outer bucket body (34) is flush with the lower end of the inner baffle ring (35), one end of the water collecting pipeline (33) is positioned outside the granulating whitening tower (2), and the outer diameter of the water collecting pipeline (33) is smaller than the inner diameter of the inner baffle ring (35).
6. The environment-friendly white-eliminating system for blast furnace granulated slag according to claim 1, wherein a spray water inlet (12), a collected water outlet (13) and a steam return port (27) are arranged on the side wall of the granulating white-eliminating tower (2), spray water can be supplied to the condensing spray device (4) through the spray water inlet (12), water collected by the spray water collecting hopper (3) can be discharged through the collected water outlet (13), the steam return port (27) is positioned below the spray water collecting hopper (3), and the steam delivery pipeline (11) is connected with the steam return port (27) through a steam return pipeline (28).
7. The environment-friendly white-elimination system for the blast furnace granulated slag as claimed in claim 6, wherein the environment-friendly white-elimination system for the blast furnace granulated slag further comprises a first cooling tower (14) and a first water storage tank (15), water discharged from the collected water outlet (13) can enter the first cooling tower (14), 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).
8. The environment-friendly white-eliminating system for blast furnace granulated slag according to claim 6, characterized in that the environment-friendly white-eliminating system for blast furnace granulated slag further comprises a second cooling tower (17) and a second water storage tank (18), wherein the filter pipe (8) of the first filtering white-eliminating tank (6) and the filter pipe (8) of the second filtering white-eliminating tank (16) are both connected with the second cooling tower (17) through a drainage pipeline (19), water cooled by the second cooling tower (17) can enter the second water storage tank (18), the lower part of the granulating white-eliminating 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 granulated slag environment-friendly whitening system according to claim 8, wherein the granulated slag outlet (21) is connected with a granulated slag inlet of the first filtering whitening pool (6) and a granulated slag inlet of the second filtering whitening pool (16) through a slag sluicing groove (22), the granulated slag inlet of the first filtering whitening pool (6) is positioned between the upper end surface of the first filtering whitening pool (6) and the upper surface of the filter layer (7) of the first filtering whitening pool (6), and the granulated slag inlet of the second filtering whitening pool (16) is positioned between the upper end surface of the second filtering whitening pool (16) and the upper surface of the filter layer (7) of the second filtering whitening pool (16).
10. The blast furnace granulated slag environment-friendly whitening system according to claim 9, characterized in that when steam discharged from the steam outlet (10) enters the filtering pipe (8) of the first filtering whitening pool (6) through the steam conveying pipeline (11), the granulated slag discharged from the granulated slag outlet (21) enters the second filtering whitening pool (16) through the slag flushing ditch (22) and the granulated slag inlet of the second filtering 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).
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