CN109136432B - Method for recovering pressure-equalizing coal gas at top of blast furnace - Google Patents
Method for recovering pressure-equalizing coal gas at top of blast furnace Download PDFInfo
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- CN109136432B CN109136432B CN201811275922.8A CN201811275922A CN109136432B CN 109136432 B CN109136432 B CN 109136432B CN 201811275922 A CN201811275922 A CN 201811275922A CN 109136432 B CN109136432 B CN 109136432B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/06—Making pig-iron in the blast furnace using top gas in the blast furnace process
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention discloses a method for recovering blast furnace top pressure-equalizing gas, which comprises the following steps: step 1, forming mixed gas by using the pressure-equalizing gas generated by the blast furnace and the furnace top gas in an alkali spraying washing tower (13); step 2, making the gas flow of the mixed gas uniform; step 3, spraying alkali liquor on the mixed gas; step 4, removing the mist in the mixed gas; and 5, removing water vapor in the mixed gas. The blast furnace top pressure equalizing gas recovery method has the advantages that the alkali spraying washing tower has the functions of washing, dust removal and alkali spraying and acid removal, the blast furnace top pressure equalizing gas recovery method can realize the acid removal treatment of the top gas of the iron-making production, eliminate the corrosivity of the top gas and simultaneously can complete the functions of dust removal and recovery of the pressure equalizing gas.
Description
Technical Field
The invention relates to the field of steel smelting equipment, in particular to a method for recovering blast furnace top pressure-equalizing gas.
Background
The coal gas discharged for a long time along with the normal production of blast furnace ironmaking comprises two parts: one part is gas discharged from the charging bucket during top charging, which is called pressure equalizing gas, and the other part is gas discharged from the top of the blast furnace through chemical reaction of raw fuel in the blast furnace, which is called top gas. When the blast furnace stops production and stops air supply due to special reasons, the coal gas discharged from the top of the blast furnace is called large-emission coal gas.
The top pressure-equalizing gas necessary for blast furnace production is released into the atmosphere (about 300 times of air discharge every day) through a cyclone dust collector and a silencer before each charging, and the pressure-equalizing gas contains a large amount of CO and CO2The emission amount of the mixed gas of poisonous and combustible substances and dust is 6-8Nm3Per ton of iron, dust content over 10g/Nm3About 7 hundred million tons of iron water are produced in China every year, and the gas quantity discharged to the atmosphere through the blast furnace top pressure equalizing and bleeding equipment is as high as 55 hundred million m3Per year, blast furnace gas unit price is 0.11 yuan/Nm3The economic loss caused by the part of the coal gas is calculated to be about 6 million yuan per year, and the amount of the discharged dust reaches 5.5 million tons per year. The blast furnace ironmaking production processThe compressed gas is directly discharged into the atmosphere, which not only causes the pollution of the atmospheric environment, but also wastes energy.
There are many technologies at home and abroad to realize the recovery of blast furnace top pressure-equalizing gas, and some have obtained good effects, such as chinese patent CN102031321A, published date 2011 4 month 27, which discloses a "blast furnace top pressure-equalizing gas recovery method and recovery device". However, in all of these technologies, a special pressure-equalizing gas dust removal device needs to be additionally added on the basis of the original blast furnace system to realize dust removal of the pressure-equalizing gas and then recycle the pressure-equalizing gas. For most blast furnace systems that require modification at the original site, the floor space and additional equipment investment of the modification process are important issues that are difficult to avoid.
Many iron and steel enterprises spray bituminous coal or anthracite to reduce coke ratio to different degrees, some iron and steel enterprises adopt imported raw material ores sprayed with seawater, and some iron and steel enterprises adopt chlorine-containing additives (CaCl) to improve sinter strength2Etc.), many steel and iron enterprises in China contain a large amount of acidic media (chloride ions and sulfate ions) in the top gas generated in the production process for the above reasons.
With the large-scale of blast furnaces and the improvement of the pressure of the furnace top, a blast furnace gas purification method is developed from a wet type to a dry type, and the latest version of blast furnace iron-making engineering design specification (GB50427-2015) clearly recommends that a dry bag type dust removal process is suitable for the blast furnace gas purification design, so that dry bag type dust removers are generally adopted in China to purify the furnace top gas. The dry dust removal can not purify acidic media in the furnace top gas, and the acidic media form strong acid solution after meeting water, which causes serious corrosion to gas pipelines. The design code of blast furnace iron-smelting engineering (GB50427-2015) recommends that when the content of corrosive substances such as chloride ions in clean coal gas is high, facilities for controlling the content of chloride ions in the coal gas, such as an alkali liquor spray tower, are arranged before the clean coal gas enters a whole plant coal gas pipe network. In order to solve the problem, many domestic iron and steel enterprises apply a coal gas all-dry dedusting technology and adopt an alkali spraying tower as a chlorine removal device of the furnace top gas, for example, a Chinese patent CN201864738U, which discloses a blast furnace gas alkali spraying chlorine removal device with publication date of 2011, 6 months and 15 days.
The blast furnace production requires the solution of the corrosion problem of the furnace top gas in terms of process and the solution of the dust removal and recovery problem of the pressure-equalizing gas in terms of environmental protection. From the analysis, the prior art has no good treatment method for the large-scale diffused coal gas, and the large-scale diffused coal gas is directly discharged to the air; for blast furnace top pressure equalizing gas, although the prior art provides a plurality of recovery methods, special pressure equalizing gas dust removal equipment needs to be additionally arranged, and the important problems of occupied area and additional equipment investment in the transformation process are faced. As an alkali spraying tower for eliminating acid media in coal gas, the alkali spraying tower only has the single function of spraying alkali and eliminating acid.
Disclosure of Invention
In order to complete the recovery of blast furnace gas. The invention provides a blast furnace top pressure-equalizing gas recovery method, wherein an alkali-spraying washing tower in the blast furnace top pressure-equalizing gas recovery method has the functions of washing, dedusting and alkali-spraying and acid-removing, and the blast furnace top pressure-equalizing gas recovery method can realize the acid-removing treatment of the top gas in iron-making production, eliminate the corrosivity of the top gas and simultaneously can complete the functions of dedusting and recovering the pressure-equalizing gas.
The technical invention for solving the technical problems is as follows:
step 1, pressure-equalizing gas generated by a blast furnace enters an alkali spraying washing tower through a pressure-equalizing gas recovery pipeline, furnace top gas generated by the blast furnace enters the alkali spraying washing tower through a furnace top gas recovery pipeline, and the pressure-equalizing gas and the furnace top gas form mixed gas in the alkali spraying washing tower;
step 2, making the gas flow of the mixed gas uniform;
step 4, removing the mist in the mixed gas;
and 5, removing water vapor in the mixed gas.
The invention has the beneficial effects that:
1. the process flow of pressure-equalizing gas recovery is simplified, and the occupied area is reduced.
2. The functions of spraying alkali and removing acid of the furnace top gas and washing and dedusting of the pressure-equalizing gas can be realized.
3. The pressure, the temperature and the flow of the pressure-equalizing gas are detected before the pressure-equalizing gas enters the alkali spraying washing tower and fed back to a blast furnace control system in time, so that the operation of the blast furnace can be optimized and the smooth operation of the blast furnace can be promoted.
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 diagram of the recovery method of blast furnace top pressure-equalizing gas according to the present invention.
FIG. 2 is a schematic structural diagram of the blast furnace top pressure equalizing gas recovery equipment of the invention.
FIG. 3 is a schematic diagram of the configuration of a caustic spray scrubber according to the present invention.
FIG. 4 is a schematic view of the structure of a lye spraying layer.
1. A blast furnace top charging tank; 2. a secondary pressure equalizing valve; 3. a nitrogen tank; 4. a cyclone dust collector; 5. a primary pressure equalizing valve; 6. a muffler; 7. a pressure equalizing blow-off valve; 8. a thermometer; 9. a flow meter; 10. a pressure gauge; 11. a pressure equalizing gas recovery valve; 12. a bleed valve; 13. spraying alkali to wash the tower; 14. a dehydrator; 15. a check valve; 16. a net gas pipe network; 17. a top gas stop valve; 18. a sewage treatment device; 19. a primary pressure equalizing system; 20. a secondary pressure equalizing system;
21. a water removal device; 22. a spraying device; 23. a demister; 24. a high pressure atomizer; 25. a gas grid; 26. alkali liquor spraying layer; 27. a long spray gun; 28. short lance.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
A method for recovering blast furnace top pressure-equalizing coal gas comprises the following steps:
step 1, pressure-equalizing gas generated by a blast furnace enters an alkali spraying washing tower 13 through a pressure-equalizing gas recovery pipeline, furnace top gas generated by the blast furnace enters the alkali spraying washing tower 13 through a furnace top gas recovery pipeline, and the pressure-equalizing gas and the furnace top gas form mixed gas in the alkali spraying washing tower 13;
step 2, making the gas flow of the mixed gas uniform;
step 4, removing the mist in the mixed gas;
and 5, removing water vapor in the mixed gas, as shown in figure 1.
In this embodiment, the alkali spraying washing tower 13 contains an air flow homogenizing device, an alkali liquor spraying device, a demister 23, an upper spraying device 22 and a water removing device 21 which are arranged in sequence from bottom to top, the air flow homogenizing device contains at least one layer of air grid 25 along the vertical direction, and the alkali liquor spraying device contains at least one alkali liquor spraying layer 26, as shown in fig. 3.
Specifically, in step 2, the gas flow homogenizing device in the alkali spraying washing tower 13 is adopted to homogenize the gas flow of the mixed gas; in step 3, spraying alkali liquor on the mixed gas by adopting the alkali liquor spraying device in the alkali liquor spraying washing tower 13; in step 4, a demister 23 in the alkali spraying washing tower 13 is adopted to remove the mist in the mixed gas; in step 5, the water vapor in the mixed gas is removed by a water removal device 21 in the alkali-spraying washing tower 13.
In this embodiment, the pressure equalizing gas inlet of the soda blast scrubber 13 is located at the lower part of the soda blast scrubber 13, the gas flow uniformizing device is located above the pressure equalizing gas inlet, the gas flow uniformizing device comprises three layers of gas grids 25, and the two adjacent layers of gas grids 25 are staggered by a set angle, so that the blast furnace gas entering the tower is uniformly distributed on the cross section of the whole tower.
In the present embodiment, the alkali spraying washing tower 13 is an upright cylindrical structure, the alkali spraying layer 26 includes a plurality of long spray guns 27 and short spray guns 28 uniformly arranged at intervals along the circumferential direction of the alkali spraying washing tower 13, the long spray guns 27 intersect at the centerline position of the alkali spraying washing tower 13, the long spray guns 27 and the short spray guns 28 are both cylindrical structures, the length of the long spray guns 27 is greater than that of the short spray guns 28, the long spray guns 27 and the short spray guns 28 are both arranged along the radial direction of the alkali spraying washing tower 13, that is, the length direction of the long spray guns 27 and the length direction of the short spray guns 28 are both arranged along the radial direction of the alkali spraying washing tower 13, and a plurality of high-pressure atomization spray heads 24 are arranged on the long spray guns 27 and the short spray guns 28, as shown in.
In this embodiment, the alkali liquor spraying device comprises a plurality of alkali liquor spraying layers 26 arranged at intervals in the vertical direction, and in two adjacent alkali liquor spraying layers 26, the spraying direction of the high-pressure atomizing spray heads 24 in one alkali liquor spraying layer 26 is all upward, and the spraying direction of the high-pressure atomizing spray heads 24 in the other alkali liquor spraying layer 26 is all downward. For example, the alkali liquor spraying device comprises four alkali liquor spraying layers 26, as shown in fig. 3, the four alkali liquor spraying layers 26 are a first alkali liquor spraying layer, a second alkali liquor spraying layer, a third alkali liquor spraying layer and a fourth alkali liquor spraying layer in sequence from bottom to top.
The spraying directions of the high-pressure atomizing spray heads 24 in the first alkali liquor spraying layer are all upward, the spraying directions of the high-pressure atomizing spray heads 24 in the second alkali liquor spraying layer are all downward, the spraying directions of the high-pressure atomizing spray heads 24 in the third alkali liquor spraying layer are all upward, and the spraying directions of the high-pressure atomizing spray heads 24 in the first alkali liquor spraying layer are all downward. The bottom of the alkali spraying washing tower 13 is provided with a sewage draining exit, and a sewage treatment device 18 is arranged below the sewage draining exit. The dust-containing sewage generated after the gas is treated by the blast furnace top pressure equalizing gas recovery method is treated by the sewage treatment device 18 to obtain sludge and recycled reclaimed water.
According to the process requirements, a plurality of alkali liquor spraying layers 26 and the attached high-pressure atomizing nozzles 24 are arranged at different heights. The alkali liquor is sprayed out from the high-pressure atomizing spray head 24 and forms an atomizing state in the alkali spraying washing tower 13, and the atomizing alkali liquor is uniformly distributed in the inner space of the alkali spraying washing tower 13. The high-pressure atomizing nozzle 24 sprays alkali liquor in a high-pressure atomizing state to realize dechlorination treatment of the coal gas.
The acidic dust-containing blast furnace gas enters the alkali spraying washing tower 13 from a gas inlet on the side surface of the lower part of the alkali spraying washing tower 13, and acid and dust removal treatment is completed under the action of atomized alkali liquor:
1. alkali spraying and acid removing treatment: the atomized alkali liquor fully distributed in the inner space of the alkali spraying washing tower 13 fully reacts with the acid medium in the coal gas to eliminate the corrosivity of the coal gas.
2. Washing and dedusting treatment: due to the inertial collision, interception and coagulation between the atomized alkali liquor and the coal gas dust, the larger particles of dust settle by gravity along with the atomized washing, are discharged together with the washing liquid, and enter the sewage treatment device 18 outside the sewage discharge outlet at the bottom of the alkali spraying washing tower 13. The dust-containing sewage can be recycled after being treated by the sewage treatment device 18 at the bottom of the alkali spraying washing tower 13.
In this embodiment, the upper shower unit 22 includes a plurality of nozzles capable of spraying water to the demister 23, the water removal unit 21 is a filler water removal unit, and the water removal unit 21 is located above the soda washing tower 13. The demister 23 may be a wire mesh demister (or other types of high-efficiency demister such as a folded plate demister), and the demister 23 is disposed in the space above the high-pressure atomizing nozzle 24. The dust with smaller particles and the alkali liquor in the atomized state form foams, the coal gas with the foams rises at a certain speed and passes through the foam remover 23, and the foam remover 23 finishes the treatment of the smaller dust particles in the coal gas to obtain the water-containing clean coal gas. An upper spraying device 22 is arranged above the demister 23, and the demister 23 is regularly sprayed and washed by high-pressure water through the upper spraying device 22, so that the demister 23 is prevented from being blocked after long-term use. The acidic dusty blast furnace gas can be treated by the action of the atomized alkali liquor sprayed by the high-pressure atomizing nozzle 24 and the demister 23 to obtain gas with larger water content, as shown in 3.
The recovery method of the blast furnace top pressure-equalizing gas is realized on a recovery device of the blast furnace top pressure-equalizing gas, the recovery device of the blast furnace top pressure-equalizing gas comprises a blast furnace top feeding tank 1, a cyclone dust collector 4, an alkali-spraying washing tower 13 and a dehydrator 14, wherein the blast furnace top feeding tank 1 is connected with an inlet of the cyclone dust collector 4 through a gas conveying pipeline, an outlet of the cyclone dust collector 4 is connected with a pressure-equalizing gas inlet of the alkali-spraying washing tower 13 through a pressure-equalizing gas recovery pipeline, a water-containing gas outlet of the alkali-spraying washing tower 13 is connected with an inlet of the dehydrator 14 through a gas conveying pipeline, and the dehydrator 14 can secondarily remove water from the treated gas. The alkali spraying washing tower 13 also comprises a top gas inlet which is positioned at the lower part of the alkali spraying washing tower 13, a top gas recovery pipeline is connected outside the top gas inlet of the alkali spraying washing tower 13, a top gas stop valve 17 is arranged on the top gas recovery pipeline, and top gas generated by a blast furnace enters the alkali spraying washing tower 13 through the top gas recovery pipeline.
In this embodiment, the top of the alkali-spraying washing tower 13 is provided with two gas outlets, which are respectively a water-containing gas outlet and a diffusion gas outlet, the diffusion gas outlet is externally connected with a diffusion valve 12, and the water-containing gas outlet is externally connected with a water remover 14, a clean gas check valve 15 and a clean gas pipe network 16 in sequence, as shown in fig. 2.
A water removal device 21 (filler water removal device) is arranged above the upper spray device 22 and close to the top outlet of the alkali spraying washing tower 13. The internal filler of the filler dewatering device can be made of aluminum alloy material, such as a rosette filler (or a stainless steel rosette filler or other types of fillers). When the water-containing coal gas passes through the water removal device 21, small water drops in the coal gas are converged into large water drops under the action of the filler, and preliminary water removal is realized under the action of gravity.
The dehydrator 14 can be a baffle-type dehydrator (or other high-efficiency dehydrators such as a cyclone dehydrator). The water-containing gas after preliminary water removal is discharged from a water-containing gas outlet at the top of the alkali spraying washing tower 13, enters a water remover 14 arranged at the outer side of the top of the alkali spraying washing tower 13 to complete water removal treatment of the water-containing gas, finally the qualified gas meeting the requirements of users is obtained, and enters a clean gas pipe network 16 through a clean gas check valve 15 for users to use.
The top outlet of the soda spray washing tower 13 is provided with a relief valve 12, and the relief valve 12 has the functions of a stop valve and a safety valve at the same time: when the internal pressure of the alkali spraying washing tower 13 is normal, the bleeding valve 12 is in a closed state; when the pressure exceeds the set value, the bleed valve 12 automatically opens to reduce the internal pressure.
The alkali spraying washing tower 13 can respectively process the top gas discharged from the top of the blast furnace and the pressure equalizing gas discharged from the charging bucket when the raw fuel in the blast furnace is subjected to chemical reaction according to the process requirements, and can also process the top gas and the pressure equalizing gas simultaneously. The alkali spraying washing tower 13 can treat the large-scale diffused coal gas when the blast furnace is stopped according to the process requirement. When the top gas and the pressure-equalizing gas with gas components meeting the recovery requirement are treated, the check valve 15 at the outlet of the top of the alkali spraying washing tower 13 is opened, the bleeding valve 12 is closed, and the treated top gas and the pressure-equalizing gas can be normally recovered and enter a clean gas pipe network 16. When the large-scale diffused coal gas with the coal gas components not meeting the recycling requirement is processed, the check valve 15 at the outlet of the top of the alkali spraying washing tower 13 is closed, the diffusing valve 12 is opened, and the coal gas meeting the emission requirement after the dust removal and acid removal processing is diffused into the air.
In the embodiment, a temperature gauge 8, a flow meter 9, a pressure gauge 10 and a pressure equalizing gas recycling valve 11 are arranged on the pressure equalizing gas recycling pipeline, a silencer 6 and a primary pressure equalizing system 19 which are connected in parallel are connected to the outlet of the cyclone dust collector 4, and a nitrogen tank 3 and a secondary pressure equalizing system 20 which are connected in series are connected to the gas conveying pipeline, as shown in fig. 2.
In this embodiment, the diameter and height of the soda blast scrubber tower 13 is determined based on the average flow rate of the blast furnace gas within the tower. The blast furnace gas comprehensive treatment device provided by the invention automatically adjusts the water spraying amount of the high-pressure atomizing nozzle 24 by detecting the pressure, the flow speed and the flow of the gas at the gas inlet of the blast furnace, and improves the neutralization reaction and the dust removal effect of the acidic dust-containing gas and the atomized alkali liquor in the alkali spraying washing tower 13.
The alkali spraying washing tower 13 has high dust removal efficiency, can remove dust with the particle size of 0.1-20 microns, and the dust content of the treated coal gas is less than 5mg/m3. The mechanical water content of the water-containing clean coal gas is less than 7g/m after being treated by the filler water removal device 21 and the water remover 143. The top gas and the pressure-equalizing gas treated by the method for recovering the blast furnace top pressure-equalizing gas provided by the invention meet the recovery requirement.
The gas grid 25, the demister 23, the upper spray device 22 and the water removal device 21 described in the present invention may be any of those commercially available. Therefore, the alkali spraying washing tower 13 provided by the invention has the advantages of simplicity, low manufacturing cost, low maintenance cost, few movable parts, difficulty in failure, high operation rate and the like, and can reduce air pollution, realize energy conservation and emission reduction and realize cyclic utilization of resources.
The following is a description of the details of the operation of the blast furnace top pressure-equalizing gas recovery method of the present invention.
After a charging program of a charging bucket is entered into a charging system of the blast furnace, a pressure-equalizing gas recovery valve 11 and a check valve 15 of a clean gas pipe network are opened, pressure-equalizing gas is discharged from a charging bucket 1 at the top of the blast furnace and then enters a cyclone dust collector 4 for coarse dust removal, and gas after coarse dust removal enters the pressure-equalizing gas recovery pipeline. The pressure-equalizing gas recovery pipeline is provided with a thermometer 8, a flowmeter 9 and a pressure gauge 10 for measuring the temperature, the flow and the pressure of the pressure-equalizing gas, and the detection values are fed back to a blast furnace control system in time, so that the operation of the blast furnace is optimized and the smooth operation of the blast furnace is promoted.
The pressure-equalizing coal gas passes through a pressure-equalizing coal gas recovery valve 11 and then is finally introduced into an alkali spraying washing tower 13 with acid and dust removal functions; the top gas enters the alkali spraying washing tower 13 through a top gas stop valve 17. According to the process requirements, the pressure-equalizing gas recovery valve 11 or the top gas stop valve 17 can be opened respectively to treat the top gas and the pressure-equalizing gas respectively; the pressure equalizing gas recovery valve 11 or the top gas stop valve 17 can be opened simultaneously to treat the top gas and the pressure equalizing gas simultaneously.
The dust-containing sewage is treated by a sewage treatment device 18 at the bottom of the alkali spraying washing tower to obtain sludge and reclaimed water, and the reclaimed water can be recycled; the clean gas containing water enters a dehydrator 14 for treatment and then directly enters a clean gas pipe network 16 through a check valve 15.
The top of the alkali spraying washing tower 13 is provided with a bleeding valve 12. When the internal pressure of the alkali spraying washing tower 13 is normal, the bleeding valve 12 is in a closed state; when the pressure exceeds the set value, the bleed valve 12 automatically opens to reduce the internal pressure.
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 inventions of the present invention, the technical features and the technical inventions, and the technical inventions can be freely combined and used.
Claims (8)
1. The blast furnace gas comprehensive treatment and recovery method is characterized by comprising the following steps of:
step 1, large diffused gas generated by a blast furnace enters an alkali spraying washing tower (13) through a diffused gas recovery pipeline, pressure-equalizing gas generated by the blast furnace enters the alkali spraying washing tower (13) through the pressure-equalizing gas recovery pipeline, furnace top gas generated by the blast furnace enters the alkali spraying washing tower (13) through a furnace top gas recovery pipeline, and the large diffused gas, the pressure-equalizing gas and the furnace top gas form mixed gas in the alkali spraying washing tower (13);
step 2, making the gas flow of the mixed gas uniform;
step 3, spraying alkali liquor on the mixed gas;
step 4, removing the mist in the mixed gas;
step 5, removing water vapor in the mixed gas;
the alkali spraying washing tower (13) is internally provided with an air flow homogenizing device, an alkali liquor spraying device, a foam remover (33), an upper spraying device (32) and a water removing device (31) which are sequentially arranged from bottom to top, the air flow homogenizing device comprises at least one layer of gas grating (35) along the vertical direction, the alkali liquor spraying device comprises at least one alkali liquor spraying layer (36), and the upper spraying device (32) comprises a plurality of nozzles capable of spraying water flow to the foam remover (33);
in the step 2, the airflow of the mixed gas is made uniform by the airflow homogenizing device; in step 3, spraying alkali liquor on the mixed gas by using the alkali liquor spraying device; in step 4, removing the mist in the mixed gas by using a demister (33); in step 5, a water removal device (31) is used to remove water vapor from the mixed gas.
2. The blast furnace gas comprehensive treatment and recovery method according to claim 1, wherein the alkali spraying washing tower (13) is an upright cylindrical structure, one alkali liquor spraying layer (36) comprises a plurality of long spray guns (37) and short spray guns (38) which are uniformly arranged at intervals along the circumferential direction of the alkali spraying washing tower (13), each long spray gun (37) and each short spray gun (38) are arranged along the radial direction of the alkali spraying washing tower (13), and each long spray gun (37) and each short spray gun (38) are provided with the high-pressure atomizing spray head (34).
3. The blast furnace gas comprehensive treatment and recovery method according to claim 2, characterized in that the alkali liquor spraying device comprises a plurality of alkali liquor spraying layers (36), and in two adjacent alkali liquor spraying layers (36), the spraying direction of the high-pressure atomizing spray heads (34) in one alkali liquor spraying layer (36) is all upward, and the spraying direction of the high-pressure atomizing spray heads (34) in the other alkali liquor spraying layer (36) is all downward.
4. The blast furnace gas comprehensive treatment and recovery method according to claim 3, wherein the alkali liquor spraying device comprises four alkali liquor spraying layers (36), and the four alkali liquor spraying layers (36) are a first alkali liquor spraying layer, a second alkali liquor spraying layer, a third alkali liquor spraying layer and a fourth alkali liquor spraying layer in sequence from bottom to top.
5. The blast furnace gas comprehensive treatment and recovery method according to claim 4, wherein the high-pressure atomization nozzles (34) in the first alkali liquor spraying layer are all upward in the spraying direction, the high-pressure atomization nozzles (34) in the second alkali liquor spraying layer are all downward in the spraying direction, the high-pressure atomization nozzles (34) in the third alkali liquor spraying layer are all upward in the spraying direction, and the high-pressure atomization nozzles (34) in the first alkali liquor spraying layer are all downward in the spraying direction.
6. The blast furnace gas comprehensive treatment and recovery method according to claim 1, wherein the upper spraying device (32) comprises a plurality of nozzles capable of spraying water flow to the demister (33), the water removal device (31) is a filler water removal device, the water removal device (31) is positioned at the upper part of the alkali spraying washing tower (13), the alkali spraying washing tower (13) further comprises a diffused gas outlet, the diffused gas outlet and the water-containing gas outlet are both positioned at the top of the alkali spraying washing tower (13), and the outside of the diffused gas outlet is connected with a washing tower diffused valve (12).
7. The blast furnace gas comprehensive treatment and recovery method according to claim 1, characterized in that a drain outlet is arranged at the bottom of the alkali spraying washing tower (13), a sewage treatment device (21) is arranged below the drain outlet, a top gas stop valve (20) is arranged on the top gas recovery pipeline, and a thermometer (8), a flowmeter (9), a pressure gauge (10) and a pressure equalizing gas recovery valve (11) are arranged on the pressure equalizing gas recovery pipeline.
8. The blast furnace gas comprehensive treatment and recovery method according to claim 1, characterized in that an outlet of the alkali spraying washing tower (13) is sequentially connected with an alkali spraying washing tower stop valve (14) and a dehydrator (15).
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| US6080226A (en) * | 1998-09-30 | 2000-06-27 | Uop Llc | Nitrous oxide purification by pressure swing adsorption |
| JP2007169748A (en) * | 2005-12-26 | 2007-07-05 | Jfe Steel Kk | Method for operating blast furnace |
| CN101928608B (en) * | 2010-08-26 | 2014-01-01 | 北京首钢国际工程技术有限公司 | Blast-furnace gas hydrogen chloride purifying and absorbing compound device and method |
| CN105944543A (en) * | 2016-07-04 | 2016-09-21 | 中冶东方工程技术有限公司 | Blast furnace gas tower-type acid-gas removal device |
| CN106191353A (en) * | 2016-08-29 | 2016-12-07 | 北京首钢国际工程技术有限公司 | A kind of blast furnace top pressure-equalizing bleeding gas recovering device and using method thereof |
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