CN110894562B - White system of straining at bottom of blast furnace slag - Google Patents
White system of straining at bottom of blast furnace slag Download PDFInfo
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- CN110894562B CN110894562B CN201911354089.0A CN201911354089A CN110894562B CN 110894562 B CN110894562 B CN 110894562B CN 201911354089 A CN201911354089 A CN 201911354089A CN 110894562 B CN110894562 B CN 110894562B
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- 239000002893 slag Substances 0.000 title claims abstract description 127
- 238000001914 filtration Methods 0.000 claims abstract description 160
- 230000002087 whitening effect Effects 0.000 claims abstract description 144
- 239000007921 spray Substances 0.000 claims abstract description 49
- 239000000463 material Substances 0.000 claims abstract description 33
- 238000001816 cooling Methods 0.000 claims abstract description 32
- 238000005507 spraying Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 223
- 238000011010 flushing procedure Methods 0.000 claims description 37
- 238000003860 storage Methods 0.000 claims description 23
- 238000009833 condensation Methods 0.000 claims description 11
- 230000005494 condensation Effects 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 6
- 239000008400 supply water Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 16
- 230000007613 environmental effect Effects 0.000 abstract description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 25
- 229910052717 sulfur Inorganic materials 0.000 description 25
- 239000011593 sulfur Substances 0.000 description 25
- 238000005469 granulation Methods 0.000 description 21
- 230000003179 granulation Effects 0.000 description 21
- 239000000203 mixture Substances 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 230000001954 sterilising effect Effects 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
- 238000011001 backwashing Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005202 decontamination Methods 0.000 description 2
- 230000003588 decontaminative effect Effects 0.000 description 2
- 230000029087 digestion Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000004064 recycling 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
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 238000010438 heat treatment 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
- 239000000047 product Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/024—Methods of cooling or quenching molten slag with the direct use of steam or liquid coolants, e.g. water
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a blast furnace slag bottom filtering and whitening system which comprises a granulating and whitening tower (2), a first filtering and whitening tower Bai Chi (6) and a second filtering and whitening tower Bai Chi (16), wherein a blast furnace slag inlet (9) and a granulator (1) are arranged at the lower part of the granulating and whitening tower (2), a condensing spray device (4) is arranged in the granulating and whitening tower (2), a steam outlet (10) is arranged at the upper part of the granulating and whitening tower (2), a filter layer (7) and a filter pipe (8) are arranged in each of the first filtering and whitening tower Bai Chi (6) and the second filtering and whitening tower Bai Chi (16), and the steam outlet (10) is connected with the filter pipe (8) of the first filtering and whitening tower Bai Chi (6) and the filter pipe (8) of the second filtering and whitening tower Bai Chi (16) through a steam conveying pipeline (11). The blast furnace slag bottom filtering and whitening system adopts a double whitening process of spraying a granulating tower and cooling filter materials of filtering and whitening Bai Chi, thoroughly eliminates harmful steam in the granulating process of the blast furnace slag, and achieves the aims of real whitening and environmental protection.
Description
Technical Field
The invention relates to the field of metal smelting equipment, in particular to a blast furnace slag bottom filtering and whitening system.
Background
High-temperature liquid slag (1350 ℃ -1500 ℃) is generated during blast furnace smelting, 7 hundred million tons of molten iron is produced annually in China, and 2.5 hundred million tons of high-temperature liquid slag are generated. Slag is usually granulated by a sediment filtration (commonly called bottom filtration) water slag process at home and abroad. Hydraulic slag flushing is carried out in front of a blast furnace, the slag is crushed by water quenching, then the slag is changed into a slag-water mixture (commonly called water slag), the water slag enters a filter tank through a slag flushing ditch, liquid water is filtered by a filter layer in the filter tank and recycled, solid slag particles are left in the filter tank, and then the slag particles are grabbed and loaded and transported outwards through a bridge grab crane.
The slag granulating process produces a large amount of sulfur-containing steam (about 60-100 ℃) in the process of granulating slag, the slag steam is corrosive, pollutes the surrounding environment in the process of dispersing, corrodes surrounding equipment, and meanwhile, the dispersed steam can cause certain corrosion to the blast furnace equipment due to the fact that the filter tank is very close to the blast furnace.
With the increasing severity of environmental protection in China, the more intense the requirements of iron and steel enterprises on steam whitening technology of water slag technology. Related researches have been carried out for many years at home and abroad, and it is hoped to eliminate slag flushing steam and realize steam whitening. For example, chinese patent CN 107815514A, publication date 2018, 3 and 20, discloses a device and method for recovering slag flushing water vapor and eliminating white fog, wherein the patent firstly adopts a spray cooling mode to realize vapor recovery, and then utilizes flue gas of hot blast stove to heat vapor to prevent white smoke. The method can effectively reduce the emission of part of steam, and can prevent white smoke from being generated by heating the steam by using the flue gas of the hot blast stove, but finally, part of steam is discharged into the atmosphere, namely, the real and thorough whitening cannot be realized.
Disclosure of Invention
In order to realize truly and thoroughly whitening, the invention provides a blast furnace slag bottom filtering and whitening system, which can reduce the spray water quantity of a granulating tower, fully exert the characteristics of filter materials in an environment-friendly bottom filter tank, ensure that the filter materials not only play a role in filtering slag-water mixtures, but also play a role in whitening steam through a back flushing system, finally realize cooling recovery and recycling of the steam, and play an environment-friendly role while avoiding energy waste.
The technical scheme adopted for solving the technical problems is as follows: the utility model provides a blast furnace slag bottom filters and disappears white system, including the granulation disappear white tower, first filtration remove Bai Chi and second filtration remove Bai Chi, the lower part of granulation disappear white tower is equipped with blast furnace slag entry and granulator, be equipped with condensation spray set in the granulation disappear white tower, the upper portion of granulation disappear white tower is equipped with steam outlet, be equipped with filter layer and filter tube in first filtration remove Bai Chi and the second filtration remove Bai Chijun, steam outlet passes through the steam delivery pipeline and is connected with the filter tube of first filtration remove Bai Chi and the filter tube of second filtration remove Bai Chi.
The granulating and whitening tower is also internally provided with a spray water collecting bucket, and a steam outlet, a condensation spraying device, the spray water collecting bucket, a blast furnace slag inlet and a granulator are sequentially arranged from top to bottom.
The side wall of the granulating and whitening tower is provided with a spray water inlet and a collecting water outlet, spray water can be supplied to the condensing and spraying device through the spray water inlet, and water collected by the spray water collecting hopper can be discharged through the collecting water outlet.
The blast furnace slag bottom filtering and whitening system further comprises a first cooling tower and a first water storage tank, water discharged from a water collecting outlet can enter the first cooling tower, water cooled by the first cooling tower can enter the first water storage tank, and the first water storage tank can supply water to a spray water inlet.
The steam delivery pipeline is provided with a steam fan, and steam discharged from the steam outlet can enter the filter pipe of the first filter tower Bai Chi or the filter pipe of the second filter tower Bai Chi through the steam delivery pipeline.
The first filtering and whitening tank has the same structure as the second filtering and whitening tank, and the filtering pipe is inside the filtering layer or below the filtering layer with gradually enlarged size.
The blast furnace slag bottom filtering and whitening system further comprises a second cooling tower and a second water storage tank, wherein the filter pipe of the first filtering and whitening Bai Chi and the filter pipe of the second filtering and whitening Bai Chi are connected with the second cooling tower through drainage pipelines, and water cooled by the second cooling tower can enter the second water storage tank.
The lower part of the granulating and whitening tower is also provided with a water slag outlet, and the second water storage tank can supply slag flushing water to the granulating device.
The water slag outlet is connected with the water slag inlet of the first filter tank Bai Chi and the water slag inlet of the second filter tank Bai Chi through a slag flushing channel, the water slag inlet of the first filter tank Bai Chi is positioned between the upper end face of the tank body of the first filter tank and the upper surface of the filter layer of the first filter tank Bai Chi, and the water slag inlet of the second filter tank Bai Chi is positioned between the upper end face of the tank body of the second filter tank Bai Chi and the upper surface of the filter layer of the second filter tank Bai Chi.
When the steam discharged from the steam outlet enters the filter pipe of the first filter block Bai Chi through the steam conveying pipeline, the water slag discharged from the water slag outlet sequentially enters the second filter block Bai China through the slag flushing groove and the water slag inlet of the second filter block Bai Chi; when the steam discharged from the steam outlet enters the filter pipe of the second filter tank Bai Chi through the steam conveying pipeline, the water slag discharged from the water slag outlet sequentially enters the first filter tank through the slag flushing ditch and the water slag inlet of the first filter tank Bai Chi.
The beneficial effects of the invention are as follows:
1. the invention can fully utilize the condensation spraying device and the filter material in the bottom filtering process to realize thorough steam whitening treatment.
2. The invention can realize the complete recovery of steam in the slag flushing granulation process and realize the recycling of water resources.
3. The invention 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.
4. The invention is not only suitable for new construction engineering of blast furnaces, but also suitable for environmental protection reconstruction of the existing blast furnace water slag system.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a schematic diagram of the structure of a blast furnace slag bottom whitening system according to the present invention.
Fig. 2 is a cross-sectional view taken along A-A in fig. 1.
Fig. 3 is a schematic view of the granulation white tower at the spray water collection hopper location.
Fig. 4 is a top view of the outer bucket and the collecting water pipe.
Fig. 5 is a sectional view taken along the direction B-B in fig. 4.
1. A granulator; 2. granulating and whitening tower; 3. a spray water collection bucket; 4. condensing and spraying device; 5. a steam fan; 6. a first filter block Bai Chi; 7. a filter layer; 8. a filter tube; 9. a blast furnace slag inlet; 10. a steam outlet; 11. a vapor transfer line; 12. a shower water inlet; 13. a collection water outlet; 14. a first cooling tower; 15. a first reservoir; 16. a second filter cake Bai Chi; 17. a second cooling tower; 18. a second reservoir; 19. a drain line; 21. a water slag outlet; 22. slag flushing ditch;
31. an inner barrel bucket; 32. an outer barrel bucket; 33. a collecting water pipe; 34. an outer bucket body; 35. an inner baffle ring; 36. a drainage through hole; 37. an annular water collection tank; 38. condensed water and spray water; 39. sulfur-containing steam;
111. a first vapor delivery branch; 112. a second vapor delivery branch; 113. and a steam delivery main line.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
The utility model provides a blast furnace slag bottom filters and disappears white system, including the granulation and disappears white tower 2, first filtration and disappears white pond 6 and the second filtration remove Bai Chi, the lower part of granulation and disappears white tower 2 is equipped with blast furnace slag entry 9 and granulator 1, be equipped with condensation spray set 4 in the granulation and disappears white tower 2, the upper portion of granulation and disappears white tower 2 is equipped with steam outlet 10, be equipped with filter layer 7 and filter tube 8 in first filtration and disappears white pond 6 and the second filtration remove Bai Chi 16 all, steam outlet 10 is connected with the filter tube 8 of first filtration and disappears white pond 6 and the filter tube 8 of second filtration and disappears white pond 16 through steam transfer pipeline 11, as shown in fig. 1.
The steam outlet 10 is connected with the filter pipe 8 of the first filtering and whitening tank 6 and the filter pipe 8 of the second filtering and whitening tank 16 through a steam conveying pipeline 11, and the rest part of sulfur-containing steam which is not condensed is discharged from the steam outlet 10 and enters the filter pipe 8 through the steam conveying pipeline 11, namely, a small part of steam which is not condensed by the condensing spray device is led into the bottom of the whitening tank. Thus, not only the thorough steam whitening treatment is realized, but also the back flushing is carried out on the filter material by steam and then the back flushing is carried out on the filter material by water, thereby improving the back flushing efficiency of 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.
In the present embodiment, the blast furnace slag inlet 9 is disposed vertically corresponding to the granulator 1, and the condensation shower 4 is located between the blast furnace slag inlet 9 and the steam outlet 10. The granulating and whitening tower 2 is internally provided with a spray water collecting bucket 3, the spray water collecting bucket 3 is positioned between the condensing spray device 4 and the blast furnace slag inlet 9, and the steam outlet 10, the condensing spray device 4, the spray water collecting bucket 3, the blast furnace slag inlet 9 and the granulator 1 are sequentially arranged from top to bottom.
The spray water collecting bucket 3 may be a product in the prior art, or in the present invention, the spray water collecting bucket 3 includes an inner barrel bucket 31, an outer barrel bucket 32 and a collecting water pipe 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 axis of the inner cylinder bucket 31, the axis of the outer cylinder bucket 32 and the axis of the granulation white tower 2 coincide. The inner barrel bucket 31 is of a conical barrel-shaped structure with the top end facing downwards and the bottom end facing upwards, the outer barrel bucket 32 comprises an outer bucket body 34 and an inner baffle ring 35, the inner baffle ring 35 is sleeved in the lower end of the outer bucket body 34, the axis of the inner baffle ring 35 is coincident with that of the outer bucket body 34, the outer bucket body 34 is of a conical barrel-shaped structure with the top end facing downwards and the bottom end facing upwards, the lower end of the outer bucket body 34 is in sealing connection with the lower end of the inner baffle ring 35 through an annular connecting plate, and an annular water collecting groove 37 is formed between the outer bucket body 34 and the inner baffle ring 35.
The upper end of the inner barrel bucket 31 is higher than the upper end of the outer barrel bucket 32, and the lower end of the inner barrel bucket 31 is flush with the lower end of the outer barrel bucket 32. The upper and lower both ends of inner tube fill 31 are open condition, and the upper and lower both ends of outer bucket body 34 are open condition, and collecting water pipe 33 is the horizontality, and the lower extreme of inner tube fill 31 and the lower extreme of outer tube fill 32 all are connected with collecting water pipe 33, and the inside of inner tube fill 31 communicates with collecting water pipe 33's inside, be equipped with drainage through-hole 36 in the annular connecting plate, annular water catch bowl 37 communicates with collecting water pipe 33's inside through drainage through-hole 36.
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 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 and whitening tower 2, the outer bucket body 34 is fixedly connected with the granulating and whitening tower 2, the lower end of the outer bucket body 34 is flush with the lower end of the inner baffle 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 baffle ring 35 are flush. One end of the collecting water pipe 33 is located outside the granulation white tower 2, the outer diameter of the collecting water pipe 33 is smaller than the inner diameter of the inner baffle ring 35, and one end of the collecting water pipe 33 is the collecting water outlet 13, as shown in fig. 1 to 5.
In use, the sulfur-containing vapor 39 moves upwardly and sequentially through the lower end of the inner baffle ring 35, the annular passage and the annular space, with a majority of the sulfur-containing vapor being condensed water under the influence of the atomizing spray water. The condensed water and a part of the shower water 38 fall into the lower end of the inner drum bucket 31, and then enter the collecting water pipe 33 and are discharged from the collecting water outlet 13. The condensed water and another portion of the shower water 38 fall into the annular water collection sump 37 at the lower end of the outer tub 32 and then enter the collection water pipe 33 and are discharged from the collection water outlet 13 as shown in fig. 3.
In the present embodiment, a shower water inlet 12 and a collecting water outlet 13 are provided on the side wall of the granulation white tower 2, the shower water inlet 12 being connected to the condensing shower device 4, shower water being able to be supplied to the condensing shower device 4 through the shower water inlet 12. The position of the collecting water outlet 13 corresponds to the position of the shower water collecting bucket 3, and the water collected by the shower water collecting bucket 3 can be discharged outside the granulation white tower 2 through the collecting water outlet 13. The lower part of the granulating and whitening tower 2 is also provided with a water slag outlet 21.
In this embodiment, the condensation spray device 4 comprises at least one layer of high pressure atomizing nozzles, and the condensation spray device 4 is capable of spraying cold water to condense the high temperature sulfur-containing steam to form condensed water, which will collect in the collecting area of the spray water collecting bucket 3. The steam outlet 10 is located at the top of the granulation white tower 2, and the steam delivery pipeline 11 comprises a steam delivery main line 113, a first steam delivery branch line 111 and a second steam delivery branch line 112, wherein the steam delivery main line 113 is provided with a steam blower 5, and the first steam delivery branch line 111 and the second steam delivery branch line 112 are respectively provided with a valve, as shown in fig. 1.
The steam blower 5 is used for leading the residual sulfur-containing steam discharged from the steam outlet 10 to enter the filter pipe 8 of the first filtering and whitening tank 6, the filter pipe 8 of the second filtering and whitening tank 16 or the filter pipe 8 of the first filtering and whitening tank 6 and the filter pipe 8 of the second filtering and whitening tank 16 through the steam conveying pipeline 11. Preferably, the steam blower 5 is used to accelerate the residual sulfur-containing steam exiting the steam outlet 10 through the steam delivery line 11 into the filter tube 8 of the first filter digester 6 or into the filter tube 8 of the second filter digester 16.
In this embodiment, the blast furnace slag bottom filtering and whitening system further includes a first cooling tower 14 and a first water storage tank 15 which are sequentially connected, the collected water outlet 13 is connected with an inlet of the first cooling tower 14 through a drainage pipeline, water discharged from the collected water outlet 13 can enter the first cooling tower 14 for cooling, water cooled by the first cooling tower 14 can enter the first water storage tank 15, an outlet of the first water storage tank 15 is connected with the spray water inlet 12 through a water supply pipeline, and the first water storage tank 15 can supply spray water to the spray water inlet 12.
In this embodiment, the wall of the filtering tube 8 is provided with a plurality of filtering through holes, and the residual sulfur-containing steam can enter the filtering layer 7 after entering the filtering tube 8 and pass through the filtering through holes, and further moves upwards, and in this process, the residual sulfur-containing steam is fully contacted (i.e. backwashed) with 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 and whitening tank, the first filtering and whitening tank 6 and the second filtering and whitening tank Bai Chi both contain deposited 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 the particle sizes gradually becoming larger from top to bottom. The deposited water in the first filter and decontamination tank 6 and the second filter and decontamination tank Bai Chi can enter the interior of the filter tube 8 through the filter layer 7 and the filter tube 8.
In this embodiment, the blast furnace slag bottom filtering and whitening system further comprises a second cooling tower 17 and a second water storage tank 18 which are sequentially connected, wherein the filter pipe 8 of the first filtering and whitening tank 6 and the filter pipe 8 of the second filtering and whitening tank 16 are connected with the inlet of the second cooling tower 17 through a drainage pipeline 19, and water in the filter pipe 8 of the first filtering and whitening tank 6 and water in the filter pipe 8 of the second filtering and whitening tank 16 can enter the second cooling tower 17 through the drainage pipeline 19 to be cooled, and water cooled by the second cooling tower 17 can enter the second water storage tank 18.
In this embodiment, the lower part of the granulation and white tower 2 is further provided with a slag outlet 21, and the second water reservoir 18 is communicated with the inlet of the granulator 1 through a water supply line, and the second water reservoir 18 can supply slag flushing water into the granulator 1. The first steam delivery branch line 111 is connected to one end of the filter pipe 8 of the first filter whitening bath 6, and the drain line 19 is connected to the other end of the filter pipe 8 of the first filter whitening bath 6. The second vapor delivery branch line 112 is connected to one end of the filter tube 8 of the second filter digestion tank 16, and the drain line 19 is connected to the other end of the filter tube 8 of the second filter digestion tank 16, as shown in fig. 1.
In this embodiment, the water slag outlet 21 is connected to the water slag inlet of the first filtering and whitening tank 6 and the water slag inlet of the second filtering and whitening tank 16 through the slag flushing groove 22, respectively, the water slag inlet of the first filtering and whitening tank 6 is located between the upper end face of the tank body 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 water slag inlet of the second filtering and whitening tank 16 is located between the upper end face of the tank body 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 this embodiment, the first filter and whitener tank 6 alternates with the second filter and whitener tank Bai Chi 16 to exert the filtering and whitening effects. That is, when the steam (the rest of the sulfur-containing steam described below) discharged from the steam outlet 10 enters the filter pipe 8 of the first filtering and whitening bath 6 through the steam transfer line 11, the water slag discharged from the water slag outlet 21 sequentially passes through the slag passing groove 22 and the water slag inlet of the second filtering and whitening bath 16 to enter the second filtering and whitening bath Bai Chi, and at this time, the first filtering and whitening bath 6 functions as whitening and the second filtering and whitening bath 16 functions as filtering. When the steam (the rest of sulfur-containing steam, which will be described later) discharged from the steam outlet 10 enters the filter pipe 8 of the second filtering and whitening bath 16 through the steam conveying pipeline 11, the water slag discharged from the water slag outlet 21 sequentially enters the first filtering and whitening bath 6 through the slag passing groove 22 and the water slag inlet of the first filtering and whitening bath 6, at this time, the first filtering and whitening bath 6 functions as filtering, and the second filtering and whitening bath 16 functions as whitening.
The working process of the blast furnace slag bottom filtering and whitening system is described below.
High-temperature slag (1350 ℃ -1500 ℃) enters the granulating and whitening tower 2 from a blast furnace slag inlet 9, and a large amount of high-speed granulating water (about 40 ℃ -45 ℃) is sprayed out of the granulator 1 and enters the granulating and whitening tower 2. In the granulation white tower 2, the high temperature slag completes granulation by the granulation water, and forms a slag-water mixture and a large amount of sulfur-containing steam (about 80 ℃ to 100 ℃) which moves upward (about 80 ℃ to 100 ℃).
The condensation spraying device 4 sprays spray water (about 40-45 ℃) to form an atomization 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. The sulfur-containing steam upwards passes through the spray water collecting bucket 3 and enters an atomized water area, most of the sulfur-containing steam becomes condensed water under the action of atomized spray water, and the condensed water and the spray water fall into the spray water collecting bucket 3 below the condensation spray device 4. The water collected by the shower water collection bucket 3 (i.e., the above condensed water and shower water) is discharged from the collected water outlet 13 out of the granulation white tower 2.
The water discharged from the collected water outlet 13 may be sent to the first cooling tower 14, the first cooling tower 14 cools the water and then sends the cooled water to the 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 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 tube 8 of the first filter digester 6 (where the second steam delivery branch 112 is closed).
The residual sulfur-containing steam is discharged from the filtering through holes of the filtering pipes 8 of the first filtering and whitening pond 6 and upwards enters the filtering layer 7 of the first filtering and whitening pond 6, the residual sulfur-containing steam moves upwards to back flush the filtering material of the filtering layer 7, the first filtering and whitening pond 6 contains sedimentary water, the water surface of the sedimentary water is usually positioned between the upper surface of the filtering layer 7 and the upper end face of the pond body of the first filtering and whitening pond 6, and after the residual sulfur-containing steam is discharged from the filtering through holes of the filtering pipes 8 and enters the first filtering and whitening pond 6, the sedimentary water fully absorbs the residual sulfur-containing steam, so that truly and thoroughly whitening is realized.
The water (slag flushing water) in the filter pipe 8 of the second filtering and whitening tank 16 sequentially passes through the drain line 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 slag flushing 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 slag flushing water sequentially pass through the slag flushing ditch 22 and the slag inlet of the second filtering and whitening tank 16 and enter the second filtering and whitening tank Bai Chi.
After a 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 112 into the filter tube 8 of the second filter digester 16 (with the first steam delivery branch 111 being closed).
The residual sulfur-containing steam is discharged from the filtering through holes of the filtering pipes 8 of the second filtering and whitening pond 16 and upwards enters the filtering layer 7 of the second filtering and whitening pond 16, the residual sulfur-containing steam moves upwards to back flush the filtering material of the filtering layer 7, the second filtering and whitening pond Bai Chi contains sedimentary water, the water surface of the sedimentary water is usually positioned between the upper surface of the filtering layer 7 and the upper end face of the pond body of the second filtering and whitening pond 16, and after the residual sulfur-containing steam is discharged from the filtering through holes of the filtering pipes 8 and enters the second filtering and whitening pond Bai Chi, the sedimentary water fully absorbs the residual sulfur-containing steam, so that truly and thoroughly whitening is realized.
The water (slag flushing water) in the filter pipe 8 of the first filtering and whitening tank 6 sequentially passes through the drain line 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 slag flushing 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 slag flushing water sequentially pass through the slag flushing groove 22 and the slag inlet of the first filtering and whitening tank 6 and enter the first filtering and whitening tank 6.
In the present invention, the first filtering and whitening bath 6 and the second filtering and whitening bath 16 are identical in structure and are arranged side by side. When a filtering agent Bai Chi receives the slag-water mixture, the slag particles and slag flushing water are separated by the filtering tank, and the slag flushing water is led to the cooling tower after passing through the filtering material and the filtering pipe, and the combination of the filtering material and the filtering pipe is called a filtering system; the other filtering and whitening tank is taken as a sterilizing tank Bai Chi, a steam fan guides a small part of uncoagulated steam in the granulating and whitening tower after passing through a condensing spray device to a sterilizing tank Bai Chi, the steam enters the residue particle cleaning rear sterilizing tank Bai Chi upwards from the bottoms of the filtering pipes and the filtering materials, and the filtering materials are backwashed, and at the moment, the combination of the filtering materials and the filtering pipes is called a backwashing system. After the back flushing of the filter material by the steam is finished, the filter material is back flushed by water, 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 avoided.
The first filtering and whitening tank 6 and the second filtering and whitening tank Bai Chi 16 are alternately recycled, namely one filtering and whitening tank Bai Chi is used as a filtering tank, and the other filtering and whitening tank is used as a whitening tank Bai Chi, so that the filtering treatment of a slag-water mixture, the whitening treatment of steam and the back flushing treatment of filter materials are realized. The cooling tower and the water storage tank for collecting water and filtering water can be shared or can be arranged separately according to the site condition.
The invention fully utilizes the filter material and the filter pipe in the bottom filtering process, and leads a small part of steam which is not condensed by the condensing spraying device to the back flushing system in the steam whitening process, thus not only realizing thorough steam whitening treatment, but also improving the back flushing efficiency of the filter material by back flushing the filter material with steam and then back flushing the filter material with water, 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 steam in the slag flushing granulation process and realize the cyclic utilization of water resources; the invention only adds the steam fan on the basis of the original slag bottom filtering process, is suitable for the new construction engineering of the blast furnace, is suitable for the environmental protection reconstruction of the existing blast furnace water slag system, and has great significance for the environmental protection production of the blast furnace water slag system.
The foregoing description of the embodiments of the invention is not intended to limit the scope of the invention, so that the substitution of equivalent elements or equivalent variations and modifications within the scope of the invention shall fall within the scope of the patent. In addition, the technical characteristics and technical characteristics, the technical characteristics and technical scheme and the technical scheme can be freely combined for use.
Claims (2)
1. The blast furnace slag bottom filtering and whitening system is characterized by comprising a granulating and whitening tower (2), a first filtering and whitening tower Bai Chi (6) and a second filtering and whitening tower Bai Chi (16), wherein a blast furnace slag inlet (9) and a granulator (1) are arranged at the lower part of the granulating and whitening tower (2), a condensing spray device (4) is arranged in the granulating and whitening tower (2), a steam outlet (10) is arranged at the upper part of the granulating and whitening tower (2), a filter layer (7) and a filter pipe (8) are arranged in each of the first filtering and whitening tower Bai Chi (6) and the second filtering and whitening tower Bai Chi (16), and the steam outlet (10) is connected with the filter pipe (8) of the first filtering and whitening tower Bai Chi (6) and the filter pipe (8) of the second filtering and whitening tower Bai Chi (16) through a steam conveying pipeline (11);
a spray water collecting bucket (3), a steam outlet (10), a condensation spraying device (4), the spray water collecting bucket (3), a blast furnace slag inlet (9) and the granulator (1) are arranged in sequence from top to bottom;
a spray water inlet (12) and a collecting water outlet (13) are arranged on the side wall of the granulating and whitening tower (2), spray water can be supplied to the condensing and spraying device (4) through the spray water inlet (12), and water collected by the spray water collecting hopper (3) can be discharged through the collecting water outlet (13);
the blast furnace slag bottom filtering and whitening system further comprises a first cooling tower (14) and a first water storage tank (15), water discharged from a 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);
the steam delivery pipeline (11) is provided with a steam fan (5), and steam discharged from the steam outlet (10) can enter the filter pipe (8) of the first filter tower Bai Chi (6) or the filter pipe (8) of the second filter tower Bai Chi (16) through the steam delivery pipeline (11);
the blast furnace slag bottom filtering and whitening system further comprises a second cooling tower (17) and a second water storage tank (18), wherein the filter pipes (8) of the first filtering and whitening Bai Chi (6) and the filter pipes (8) of the second filtering and whitening Bai Chi (16) are connected with the second cooling tower (17) through drainage pipelines (19), and water cooled by the second cooling tower (17) can enter the second water storage tank (18);
the lower part of the granulating and whitening tower (2) is also provided with a water slag outlet (21), and the second water storage tank (18) can supply slag flushing water to the granulator (1);
the water slag outlet (21) is connected with a water slag inlet of the first filter device Bai Chi (6) and a water slag inlet of the second filter device Bai Chi (16) through a slag flushing groove (22), the water slag inlet of the first filter device Bai Chi (6) is positioned between the upper end face of the tank body of the first filter device Bai Chi (6) and the upper surface of the filter layer (7) of the first filter device Bai Chi (6), and the water slag inlet of the second filter device Bai Chi (16) is positioned between the upper end face of the tank body of the second filter device Bai Chi (16) and the upper surface of the filter layer (7) of the second filter device Bai Chi (16);
when the steam discharged from the steam outlet (10) enters the filter pipe (8) of the first filter tower Bai Chi (6) through the steam conveying pipeline (11), the water slag discharged from the water slag outlet (21) sequentially passes through the slag flushing groove (22) and the water slag inlet of the second filter tower Bai Chi (16) to enter the second filter tower Bai Chi (16); when the steam discharged from the steam outlet (10) enters the filter pipe (8) of the second filter block Bai Chi (16) through the steam conveying pipeline (11), the water slag discharged from the water slag outlet (21) sequentially passes through the slag flushing groove (22) and the water slag inlet of the first filter block Bai Chi (6) to enter the first filter block Bai Chi (6).
2. The blast furnace slag bottom filtering and whitening system according to claim 1, wherein the first filtering and whitening Bai Chi (6) has the same structure as the second filtering and whitening Bai Chi (16), the filter pipe (8) is positioned in the filter layer (7) or below the filter layer (7), and the filter layer (7) contains a filter material with a particle size gradually increasing from top to bottom.
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| AT12702U1 (en) * | 2011-12-21 | 2012-10-15 | Tschinkel Maschinen Und Anlagenbau Gmbh | DEVICE FOR COOLING SLAG |
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