CN110982970B - Environment-friendly whitening method for blast furnace granulated slag system - Google Patents
Environment-friendly whitening method for blast furnace granulated slag system Download PDFInfo
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- CN110982970B CN110982970B CN201911354093.7A CN201911354093A CN110982970B CN 110982970 B CN110982970 B CN 110982970B CN 201911354093 A CN201911354093 A CN 201911354093A CN 110982970 B CN110982970 B CN 110982970B
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- 239000002893 slag Substances 0.000 title claims abstract description 82
- 230000002087 whitening effect Effects 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 183
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 66
- 239000011593 sulfur Substances 0.000 claims abstract description 64
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 64
- 239000007921 spray Substances 0.000 claims abstract description 61
- 239000000463 material Substances 0.000 claims abstract description 28
- 238000009833 condensation Methods 0.000 claims abstract description 27
- 230000005494 condensation Effects 0.000 claims abstract description 27
- 238000005507 spraying Methods 0.000 claims abstract description 25
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 230000008030 elimination Effects 0.000 claims description 19
- 238000003379 elimination reaction Methods 0.000 claims description 19
- 238000002347 injection Methods 0.000 claims description 14
- 239000007924 injection Substances 0.000 claims description 14
- 238000004061 bleaching Methods 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 5
- 230000008021 deposition Effects 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 3
- 239000003245 coal Substances 0.000 claims 3
- 238000011001 backwashing Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 5
- 238000001914 filtration Methods 0.000 description 27
- 238000011010 flushing procedure Methods 0.000 description 11
- 238000005469 granulation Methods 0.000 description 11
- 230000003179 granulation Effects 0.000 description 11
- 241000276489 Merlangius merlangus Species 0.000 description 7
- 239000007789 gas Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 238000011084 recovery Methods 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
- 238000001816 cooling Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000005453 pelletization Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 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
- 239000003595 mist Substances 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
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/08—Treatment of slags originating from iron or steel processes with energy recovery
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- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses an environment-friendly whitening method for a blast furnace granulated slag system, which comprises the following steps of: step 1: the high-temperature molten slag meets the granulated water to generate a slag-water mixture and sulfur-containing steam; step 2: spraying water sprayed by the condensation spraying device (4) to spray the sulfur-containing steam, wherein most of the sulfur-containing steam is condensed water under the action of the spraying water; and step 3: the rest part of the sulfur-containing steam enters a demister (14) for defoaming; and 4, step 4: the rest part of the sulfur-containing steam enters a filter pipe (8) of the blank removing pool (6); and 5: the remaining part of the sulfur-containing vapor is discharged from the filter pipe (8) and enters the filter layer (7) of the blank pool (6) upwards. In the steam whitening process, a small part of steam which is not condensed by the condensing and spraying device is led to the bottom of the whitening pool, so that the backwashing efficiency of 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.
Description
Technical Field
The invention relates to the technical field of metal smelting, in particular to an environment-friendly whitening method for a blast furnace water slag 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 whitening, the invention provides the environment-friendly whitening method for the blast furnace water slag system, which fully utilizes the filter material in the bottom filter method process, leads a small part of steam which is not condensed by a condensing spray device to the bottom of a whitening pool in the steam whitening process, not only realizes thorough steam whitening treatment, but also firstly uses the steam to backwash the filter material and then uses water to backwash the filter material, can improve the backwashing 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.
The technical scheme adopted by the invention for solving the technical problems is as follows: an environment-friendly whitening method for a blast furnace granulated slag system comprises the following steps:
step 1: the high-temperature molten slag meets the granulated water to generate a slag-water mixture and sulfur-containing steam;
step 2: spraying spray water sprayed by the condensation spray device to spray the sulfur-containing steam, wherein most of the sulfur-containing steam is condensed water under the action of the spray water;
and step 3: the rest part of the sulfur-containing steam enters a demister for defoaming;
and 4, step 4: the rest part of the sulfur-containing steam enters a filter pipe of a white eliminating pool;
and 5: the remaining portion of the sulfur-containing vapor exits the filter tubes and passes upwardly into the filter bed of the blank space.
The environment-friendly white-eliminating method of the blast furnace granulated slag system adopts environment-friendly white-eliminating equipment of the blast furnace granulated slag system, the environment-friendly white-eliminating equipment of the blast furnace granulated slag system comprises a granulating white-eliminating tower and a white-eliminating pool, a blast furnace molten slag inlet and a granulator are arranged at the lower part of the granulating white-eliminating tower, the condensing and spraying device is arranged in the granulating white-eliminating tower, a steam outlet is arranged at the upper part of the granulating white-eliminating tower, a filter layer and a filter pipe are arranged in the white-eliminating pool, the steam outlet is connected with the filter pipe through a steam conveying pipeline, a foam remover and a steam fan are sequentially arranged on the steam conveying pipeline, and the white-eliminating pool contains.
In step 1, the high-temperature molten slag is discharged from a blast furnace molten slag inlet of a granulating and whitening tower, the granulating water is discharged from a granulator of the granulating and whitening tower, the high-temperature molten slag and the granulating water meet in the granulating and whitening tower, the temperature of the high-temperature molten slag is 1350-1500 ℃, the temperature of the granulating water is 40-45 ℃, and the temperature of the sulfur-containing steam is 80-100 ℃.
The side wall of the granulating and whiting eliminating tower is provided with a gas injection port, a spray water collecting hopper, a steam outlet, the gas injection port, a condensation spraying device, the spray water collecting hopper, a blast furnace slag inlet and a granulator are sequentially arranged from top to bottom, and the condensation spraying device comprises at least one layer of high-pressure atomizing nozzles.
Still be equipped with the shower water entry on the lateral wall of pelletization white tower that disappears, collect water export and steam and return the mouth, steam conveying pipeline returns the pipeline through steam and is connected with steam return mouth, can pour into the air into in the upper end of pelletization white tower through the gas injection mouth, can supply the shower water to condensation spray set through the shower water entry, can collect the log raft play that the fill was collected with the shower water through collecting the water export, the below that the fill was collected to the shower water is collected to steam return the mouth.
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 located outside the granulating and whitening tower, the outer diameter of the water collecting pipeline is smaller than the inner diameter of the inner baffle ring, and one end of the water collecting pipeline is a.
In the step 2, the temperature of spray water sprayed by the condensation spraying device is 40-45 ℃; in step 4, enabling the residual part of the sulfur-containing steam to enter a filter pipe of a white eliminating pool by a steam fan; in step 5, the rest of the sulfur-containing steam enters the filter layer of the bleaching tank and contacts with the filter material of the filter layer.
The filtering pipe is positioned in or below the filtering layer, the filtering layer contains filtering materials with gradually increased grain sizes from top to bottom, the upper end surface of the whitening pool is higher than the upper surface of the filtering layer, and the liquid level of the deposition water in the whitening pool is higher than the upper surface of the filtering layer.
The invention has the beneficial effects that:
1. the invention can fully utilize the condensation spray device, the normal temperature air and the filter material in the bottom filtration process to realize the 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 equipment of the blast furnace granulated slag system.
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 white water removal 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 demister; 15. an air blower; 16. a gas injection port; 17. a steam return port; 18. a vapor return line; 19. a valve;
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.
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.
An environment-friendly whitening method for a blast furnace granulated slag system comprises the following steps:
step 1: the high-temperature molten slag meets the granulated water to generate a slag-water mixture and sulfur-containing steam;
step 2: spraying spray water sprayed by the condensation spray device 4 to spray the sulfur-containing steam, wherein most of the sulfur-containing steam (calculated by volume of about 75-95%) becomes condensed water under the action of the spray water;
and step 3: the remaining portion of the sulfur-containing vapor enters the demister 14 for defoaming (i.e., the remaining portion of the sulfur-containing vapor is purged of mist);
and 4, step 4: the rest part of the sulfur-containing steam (namely 25 to 5 percent of the volume of the sulfur-containing steam without forming condensed water) enters a filtering pipe 8 of the blank removing pond 6;
and 5: the remainder of the sulfur-containing vapor exits the filter tubes 8 and passes upwardly into the filter layer 7 of the blank space 6.
The environment-friendly white-removing method of the blast furnace granulated slag system adopts environment-friendly white-removing equipment of the blast furnace granulated slag system, the environment-friendly white-removing equipment of the blast furnace granulated slag system comprises a granulating white-removing tower 2 and a white-removing pool 6, a blast furnace molten slag inlet 9 and a granulator 1 are arranged at the lower part of the granulating white-removing tower 2, a condensing spray device 4 is arranged in the granulating white-removing tower 2, a steam outlet 10 is arranged at the upper part of the granulating white-removing tower 2, a filter layer 7 and a filter pipe 8 are arranged in the white-removing pool 6, the steam outlet 10 is connected with the filter pipe 8 through a steam conveying pipeline 11, a foam remover 14 and a steam fan 5 are sequentially arranged on the steam conveying pipeline 11, and the white-removing pool 6 contains deposition water as shown.
The steam outlet 10 is connected with the filter pipe 8 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 filter pipe 8 through the steam conveying pipeline 11, namely, a small part of steam which is not condensed by the condensation spraying device is guided 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 the embodiment, the side wall of the granulated whiting tower 2 is provided with an air injection port 16, and an air blower 15 is connected outside the air injection port 16. The blast furnace slag inlet 9 and the granulator 1 are arranged up and down correspondingly, and the condensation spraying device 4 is positioned between the blast furnace slag inlet 9 and the steam outlet 10. The granulating and whiting-eliminating 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 gas injection port 16, 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.
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 17, and the steam delivery pipeline 11 is connected with the steam return port 17 through a steam return pipeline 18. Air can be injected into the upper end of the granulation and whitening tower 2 through the air injection port 16 and the air blower 15, and the negative pressure value at the top of the granulation 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 17 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 18 for re-spraying and condensation. That is, in step 4, the remaining part of the sulfur-containing steam can enter the filtering pipe 8 of the bleaching tank 6, or the remaining part of the sulfur-containing steam can enter the granulation bleaching tower 2, and valves 19 are arranged on the steam conveying line 11 and the steam return line 18 so as to control the flow direction of the sulfur-containing steam in the steam conveying line 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 positioned at the top of the granulation and whitening tower 2, the steam conveying pipeline 11 is provided with a demister 14 and a steam fan 5, and the steam fan 5 is used for enabling residual sulfur-containing steam discharged from the steam outlet 10 to enter the filter pipe 8 through the steam conveying pipeline 11 or return the residual sulfur-containing steam to the granulation and whitening tower 2.
In this embodiment, the wall of the filtering pipe 8 has a plurality of filtering through holes, and the residual sulfur-containing vapor can enter the filtering layer 7 upward after entering the filtering pipe 8 through the filtering through holes, as shown in fig. 2. The structure of the whitening tank 6 is basically the same as that of the existing filtering tank, 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 condensation spray device 4 eliminates most of sulfur-containing steam generated in the slag granulation process through high-pressure atomization spray water, and completes the first step of white elimination of the sulfur-containing steam. The steam fan 5 can make the sulfur-containing steam formed in the slag granulation area quickly flow to the condensation spraying device 4, and a small part of the sulfur-containing steam which is not condensed is led to the filter pipe 8 of the white-removing pool 6 after the preliminary white removing is finished. The filter pipe 8 can lead sulfur-containing steam or water to the bottom of the bleaching tank 6 to carry out back flushing on the filter material from bottom to top. And a plurality of layers of filter materials with gradually increased granularity are arranged in the bleaching tank 6 from top to bottom, a small part of steam left after the first bleaching is back-flushed from the bottom of the filter materials in the bleaching tank 6 upwards through a back-flushing system, and the steam is thoroughly bleached in the process of back flushing.
In step 1, the high-temperature molten slag is discharged from a blast furnace molten slag inlet 9 of the granulating and water-reducing tower 2, the granulating water is discharged from a granulator 1 of the granulating and water-reducing tower 2, the high-temperature molten slag meets the granulating and water-reducing tower 2, the high-temperature molten slag is granulated under the action of the granulating water, and a slag-water mixture and a large amount of sulfur-containing steam are formed. The temperature of the high-temperature slag is 1350-1500 ℃, the temperature of the granulating water is 40-45 ℃, and the temperature of the sulfur-containing steam is 80-100 ℃. The slag flushing water enters the granulating and whiting tower 2 from a slag flushing water inlet at the lower part of the granulating and whiting tower 2, the slag water mixture is flushed out of the granulating and whiting tower 2 from a slag water outlet at the lower part of the granulating and whiting tower 2, and the sulfur-containing steam moves upwards in the granulating and whiting tower 2.
In step 2, the temperature of the spray water sprayed by the condensation spraying device 4 is 40-45 ℃, most of the sulfur-containing steam becomes condensed water under the action of the spray water, and the condensed water and the spray water fall into the collection area of the spray water collection hopper 3. Namely, spray water (about 40-45 ℃) sprayed by the condensation spray device 4 forms an atomized state in the granulation and white elimination tower 2, and the atomized spray water is uniformly distributed in the internal space of the granulation and white elimination 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 in the spray water collection of condensation spray set 4 below is fought 3 with spray water 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 and can be sent to a cooling tower.
In step 3, the residual part of the sulfur-containing steam is discharged from the steam outlet 10 at the top of the granulated whitening tower 2, the residual part of the sulfur-containing steam enters a demister 14 for defoaming, air can be injected into the upper end of the granulated whitening tower 2 through an air injection port 16 and an air injection fan 15, and the negative pressure value at the top of the granulated whitening tower can be adjusted by adjusting the air inflow amount.
In step 4, the rest of the defoamed sulfur-containing steam enters the filtering pipe 8 through the steam conveying pipeline 11, or the rest of the defoamed sulfur-containing steam enters the lower part of the granulation and whitening tower 2 through the steam conveying pipeline 11 and the steam return pipeline 18 in sequence. The steam fan 5 can accelerate the upward movement of the sulfur-containing steam, and the steam fan 5 can also quickly lead the rest part of the sulfur-containing steam to enter the filter pipe 8 of the white-eliminating pool 6 or the lower part of the granulating white-eliminating tower 2.
In step 5, the residual part of the sulfur-containing steam is discharged from the filter pipe 8 and upwards enters the filter layer 7 of the bleaching tank 6, the residual part of the sulfur-containing steam enters the filter layer 7 of the bleaching tank 6 to continuously move upwards and fully contact with the filter material of the filter layer 7, the residual part of the sulfur-containing steam moves upwards so as to realize backwashing on the filter material of the filter layer 7, and the deposited water completely absorbs the residual part of the sulfur-containing steam, so that the true thorough bleaching is realized.
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. The environment-friendly whitening method for the blast furnace granulated slag system is characterized by comprising the following steps of:
step 1: the high-temperature molten slag meets the granulated water to generate a slag-water mixture and sulfur-containing steam;
step 2: spraying water sprayed by the condensation spraying device (4) to spray the sulfur-containing steam, wherein most of the sulfur-containing steam is condensed water under the action of the spraying water;
and step 3: the rest part of the sulfur-containing steam enters a demister (14) for defoaming;
and 4, step 4: the rest part of the sulfur-containing steam enters a filter pipe (8) of the blank removing pool (6);
and 5: the rest part of the sulfur-containing steam is discharged from the filter pipe (8) and upwards enters a filter layer (7) of the bleaching pool (6), and the bleaching pool (6) contains deposition water;
in step 5, the residual part of the sulfur-containing steam enters the filter layer (7) of the whitening pool (6) and contacts with the filter material of the filter layer (7), and the deposited water can completely absorb the residual part of the sulfur-containing steam.
2. The environment-friendly white water elimination method of the blast furnace granulated slag system according to claim 1, wherein the environment-friendly white water elimination method of the blast furnace granulated slag system adopts environment-friendly white water elimination equipment of the blast furnace granulated slag system, the environment-friendly white water elimination equipment of the blast furnace granulated slag system comprises a granulating white water elimination tower (2) and the white water elimination pool (6), a blast furnace molten slag inlet (9) and a granulator (1) are arranged at the lower part of the granulating white water elimination tower (2), the condensing and spraying device (4) is arranged in the granulating white water elimination tower (2), a steam outlet (10) is arranged at the upper part of the granulating white water elimination tower (2), a filter layer (7) and a filter pipe (8) are arranged in the white water elimination pool (6), the steam outlet (10) is connected with the filter pipe (8) through a steam conveying pipeline (11), and a demister (14) and a steam fan (5) are sequentially arranged on the steam conveying pipeline (11).
3. The blast furnace slag system environment-friendly whitening method according to claim 2, characterized in that in step 1, the high-temperature molten slag is discharged from a blast furnace slag inlet (9) of a granulating and whitening tower (2), the granulating water is discharged from a granulator (1) of the granulating and whitening tower (2), the high-temperature molten slag and the granulating water meet in the granulating and whitening tower (2), the temperature of the high-temperature molten slag is 1350-1500 ℃, the temperature of the granulating water is 40-45 ℃, and the temperature of the sulfur-containing steam is 80-100 ℃.
4. The environment-friendly white coal eliminating method of the blast furnace granulated slag system according to claim 2, wherein the side wall of the granulating white coal eliminating tower (2) is provided with a gas injection port (16), the granulating white coal eliminating tower (2) is also internally provided with a spray water collecting hopper (3), a steam outlet (10), the gas injection port (16), a condensation spraying 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, and the condensation spraying device (4) comprises at least one layer of high-pressure atomizing nozzles.
5. The environment-friendly white-fire reduction method for the blast furnace granulated slag system according to claim 4, wherein a spray water inlet (12), a collected water outlet (13) and a steam return port (17) are further arranged on the side wall of the granulated white-fire reduction tower (2), the steam delivery pipeline (11) is connected with the steam return port (17) through a steam return pipeline (18), air can be injected into the upper end of the granulated white-fire reduction tower (2) through an air injection port (16), spray water can be supplied to the condensation spray device (4) through the spray water inlet (12), water collected by the spray water collection hopper (3) can be discharged through the collected water outlet (13), and the steam return port (17) is positioned below the spray water collection hopper (3).
6. The environment-friendly white-removing method for the blast furnace water slag system according to claim 5, characterized in that 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), an annular channel is formed between the inner barrel bucket (31) and the outer barrel bucket (32), the outer barrel bucket (32) comprises an outer bucket body (34) and an inner retaining ring (35), the lower end of the outer bucket 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 bucket body (34) and the inner retaining ring (35).
7. The environment-friendly whitening method for the blast furnace water slag system according to claim 6, characterized in that 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), a water drainage through hole (36) is arranged in the annular connecting plate, and the annular water collecting tank (37) is communicated with the interior of the water collecting pipeline (.
8. The environment-friendly white elimination method of the blast furnace water slag system as claimed in claim 7, wherein the outer diameter of the upper end of the inner barrel bucket (31) is smaller than the inner diameter of the granulating white elimination 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 barrel (34) is equal to the inner diameter of the granulating white elimination tower (2), the lower end of the outer barrel (34) is flush with the lower end of the inner baffle ring (35), one end of the water collection pipeline (33) is positioned outside the granulating white elimination tower (2), the outer diameter of the water collection pipeline (33) is smaller than the inner diameter of the inner baffle ring (35), and one end of the water collection pipeline (33) is the water collection outlet (13).
9. The environment-friendly whitening method for the blast furnace granulated slag system according to claim 2, characterized in that in the step 2, the temperature of spray water sprayed by the condensation spraying device (4) is 40-45 ℃; in step 4, the steam fan (5) can make the rest part of the sulfur-containing steam enter a filter pipe (8) of the blank pool (6).
10. The environment-friendly whitening method of a blast furnace water slag system according to claim 2, characterized in that the filter pipe (8) is positioned in the filter layer (7) or below the filter layer (7), the filter layer (7) contains filter materials with gradually increasing particle sizes from top to bottom, the upper end surface of the whitening pool (6) is higher than the upper surface of the filter layer (7), and the liquid level of the deposition water in the whitening pool (6) is higher than the upper surface of the filter layer (7).
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| US5540895A (en) * | 1994-06-03 | 1996-07-30 | Paul Wurth S.A. | Device for the treatment of mixture of steam and air contaminated with sulphurous gases, formed during the granulation and dehydration of blast furnace slag |
| LU91765B1 (en) * | 2010-12-14 | 2012-06-15 | Wurth Paul Sa | Steam condensation tower for a granulation installation |
| CN209428548U (en) * | 2018-12-27 | 2019-09-24 | 中冶京诚工程技术有限公司 | Environment-friendly energy-saving type blast furnace slag intelligent treatment system |
| CN109457070B (en) * | 2018-12-27 | 2023-12-05 | 中冶京诚工程技术有限公司 | Steam whitening and heat energy recovery system for blast furnace water slag process |
| CN209630917U (en) * | 2019-01-18 | 2019-11-15 | 浙江蓝天求是环保股份有限公司 | A kind of wet process of FGD depth disappears white system |
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