CN109112241B - Blast furnace top pressure equalizing gas recovery equipment - Google Patents
Blast furnace top pressure equalizing gas recovery equipment Download PDFInfo
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- CN109112241B CN109112241B CN201811275914.3A CN201811275914A CN109112241B CN 109112241 B CN109112241 B CN 109112241B CN 201811275914 A CN201811275914 A CN 201811275914A CN 109112241 B CN109112241 B CN 109112241B
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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 application discloses blast furnace top pressure equalizing gas recovery equipment, which comprises a blast furnace top charging tank (1), a cyclone dust collector (4), an alkali spraying washing tower (13) and a dehydrator (14), wherein the blast furnace top charging 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, and 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. The alkali spraying washing tower in the blast furnace top pressure-equalizing gas recovery device has the functions of washing, dust removing and alkali spraying and acid removing, and does not need to add additional pressure-equalizing gas dust removing equipment, so that the blast furnace top gas and the pressure-equalizing gas are directly introduced into the alkali spraying washing tower, thereby realizing alkali spraying and acid removing treatment of the top gas and washing, dust removing treatment and recovery of the pressure-equalizing gas.
Description
Technical Field
The application relates to the field of steel smelting equipment, in particular to blast furnace top pressure equalizing gas recovery equipment.
Background
The coal gas discharged for a long time along with normal production of blast furnace ironmaking comprises two parts: one part is the gas discharged from a charging tank during charging of the furnace top, which is called equalizing gas, and the other part is the gas discharged from the furnace top by chemical reaction of raw fuel in the blast furnace, which is called furnace top gas. When the blast furnace is interrupted for production and stops blowing for special reasons, the gas discharged from the furnace top is called large-emission gas.
The furnace top pressure equalizing gas necessary for blast furnace production is discharged into the atmosphere (about 300 times of air discharge each day) after passing through a cyclone dust collector and a silencer before each charging, and the pressure equalizing gas containsA large amount of CO and CO 2 Mixed gas of toxic and combustible matters and dust, and the release amount of equalizing gas is 6-8Nm 3 Per ton of iron, dust content exceeding 10g/Nm 3 About 7 hundred million tons of iron water is produced annually in China, and the gas amount discharged into the atmosphere through the blast furnace top pressure equalizing and diffusing equipment is up to 55 hundred million meters 3 Per year, the blast furnace gas unit price is 0.11 yuan/Nm 3 The economic loss caused by the gas is calculated to be about 6 hundred million yuan/year, and the discharged dust amount reaches 5.5 ten thousand tons/year. The equalizing gas in the blast furnace ironmaking production process is directly discharged into the atmosphere, which not only causes the pollution of the atmospheric environment, but also wastes energy.
There are many techniques at home and abroad to realize the recovery of the blast furnace top equalizing gas, and some have obtained good effects, such as chinese patent CN102031321a, publication date 2011, month 4, and 27, and a method and a device for recovering blast furnace top equalizing gas are disclosed. However, the technologies all need to additionally add special pressure-equalizing gas dust-removing equipment on the basis of the original blast furnace system, so that the recovery is realized after the dust removal of the pressure-equalizing gas. For most blast furnace systems that require modification on 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 coal to reduce the coke ratio to different degrees, some iron and steel enterprises adopt imported raw ore sprayed with seawater, and some iron and steel enterprises adopt chlorine-containing additives (CaCl) for improving the strength of sintered ore 2 Etc.), for the above reasons, many domestic iron and steel enterprises have a large amount of acidic media (chloride and sulfate ions) in the top gas produced during production.
With the enlargement of blast furnaces and the increase of furnace top pressure, the blast furnace gas purification method is developed from wet type to dry type, and the latest edition of ' blast furnace ironmaking engineering design Specification (GB 50427-2015) clearly recommends ' the blast furnace gas purification design is suitable for adopting a dry type bag dust removal process ', so that a dry type bag dust remover is generally adopted in China to finish the purification of the furnace top gas. The dry dust removal can not purify acidic media in the top gas, and the acidic media form strong acid solution after meeting water, so that serious corrosion is caused to gas pipelines. The design specification of blast furnace ironmaking engineering (GB 50427-2015) recommends that when the content of corrosive substances such as purified gas chloride ions is high, facilities for controlling the content of chloride ions in gas such as alkali liquor spray towers are arranged before entering a gas pipe network of a whole plant. Aiming at the situation, many domestic iron and steel enterprises adopt an alkali spraying tower as a chlorine removal device of top gas while applying a gas full dry dedusting technology, such as Chinese patent CN201864738U, publication date 2011, 6 and 15, and a blast furnace gas alkali spraying chlorine removal device is disclosed.
The blast furnace production is required to solve the corrosion problem of the top gas in the process and the dust removal and recovery problem of the equalizing gas in the environment protection. From the analysis, the prior art has no good treatment method for large-emission gas, and the prior art directly discharges the gas to the air; for the equalizing gas at the top of the blast furnace, although the prior art provides a plurality of recovery methods, special equalizing gas dust removing equipment is additionally added, 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 medium in coal gas, the alkali spraying tower has only a single function of alkali spraying and acid removal.
Disclosure of Invention
In order to complete dust and acid removal of blast furnace gas. The application provides a blast furnace top pressure-equalizing gas recovery device, wherein an alkali-spraying washing tower in the blast furnace top pressure-equalizing gas recovery device has the functions of washing, dust removing and alkali-spraying acid removing, and the blast furnace top gas and the pressure-equalizing gas are directly introduced into the alkali-spraying washing tower without adding additional pressure-equalizing gas dust removing equipment, so that the alkali-spraying acid-removing treatment of the top gas and the washing, dust removing treatment and recovery of the pressure-equalizing gas can be realized.
The application solves the technical problems that: the blast furnace top pressure equalizing gas recovery device comprises a blast furnace top charging tank, a cyclone dust collector, an alkali spraying washing tower and a dehydrator, wherein the blast furnace top charging tank is connected with an inlet of the cyclone dust collector through a gas conveying pipeline, an outlet of the cyclone dust collector is connected with a pressure equalizing gas inlet of the alkali spraying washing tower through a pressure equalizing gas recovery pipeline, and a water-containing gas outlet of the alkali spraying washing tower is connected with an inlet of the dehydrator through a gas conveying pipeline.
The alkali spraying washing tower is internally provided with an air flow homogenizing device, an alkali liquor spraying device, a foam remover, an upper spraying device and a water removing device which are sequentially arranged from bottom to top, wherein the air flow homogenizing device comprises at least one layer of air grid along the vertical direction, and the alkali liquor spraying device comprises at least one alkali liquor spraying layer.
The alkali spraying washing tower is of an upright cylindrical structure, one alkali spraying layer comprises a plurality of long spray guns and short spray guns which are uniformly arranged at intervals along the circumferential direction of the alkali spraying washing tower, each long spray gun and each short spray gun are radially arranged along the alkali spraying washing tower, and each long spray gun and each short spray gun are provided with a high-pressure atomizing nozzle.
The alkali liquor spraying device comprises a plurality of alkali liquor spraying layers, in two adjacent alkali liquor spraying layers, the spraying direction of the high-pressure atomizing spray heads in one alkali liquor spraying layer is all upward, and the spraying direction of the high-pressure atomizing spray heads in the other alkali liquor spraying layer is all downward.
The alkali liquor spraying device comprises four alkali liquor spraying layers, wherein the four alkali liquor spraying layers 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 nozzles in the first alkali liquor spraying layer are all upward, the spraying directions of the high-pressure atomizing nozzles in the second alkali liquor spraying layer are all downward, the spraying directions of the high-pressure atomizing nozzles in the third alkali liquor spraying layer are all upward, and the spraying directions of the high-pressure atomizing nozzles in the fourth alkali liquor spraying layer are all downward.
The upper spraying device comprises a plurality of nozzles capable of spraying water flow to the demister, the water removing device is a filler water removing device, the water removing device is positioned at the upper part of the spray alkali washing tower, the spray alkali washing tower also comprises a diffusing gas outlet, the diffusing gas outlet and the water-containing gas outlet are both positioned at the top of the spray alkali washing tower, and a diffusing valve is connected outside the diffusing gas outlet.
The bottom of the alkali spraying washing tower is provided with a sewage outlet, a sewage treatment device is arranged below the outside of the sewage outlet, the alkali spraying washing tower also comprises a top gas inlet, a top gas supply pipeline is connected to the outside of the top gas inlet of the alkali spraying washing tower, and a top gas stop valve is arranged on the top gas supply pipeline.
The pressure equalizing gas recovery pipeline is provided with a thermometer, a flowmeter, a pressure gauge and a pressure equalizing gas recovery valve, an outlet of the cyclone dust collector is connected with a muffler and a primary pressure equalizing system which are connected in parallel, the gas conveying pipeline is connected with a nitrogen tank and a secondary pressure equalizing system which are connected in series, and an outlet of the water remover is connected with a clean gas pipe network.
The beneficial effects of the application are as follows:
1. simplifying the process flow of pressure equalizing gas recovery and reducing the occupied area.
2. The spray alkali washing tower has simple structure, low cost and low maintenance cost.
3. The spray alkali washing tower has few movable parts, is not easy to break down and has high operation rate.
4. Not only can realize the alkali spraying and acid removing functions of the top gas, but also can realize the washing and dust removing functions of the pressure equalizing gas.
5. The pressure, temperature and flow of the pressure-equalizing gas are detected before the pressure-equalizing gas enters the alkali spraying washing tower and fed back to the blast furnace central control system in time, so that the blast furnace operation can be optimized and the blast furnace can be promoted to run forward.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application.
FIG. 1 is a schematic diagram of a blast furnace top equalizing gas recovery apparatus according to the present application.
FIG. 2 is a schematic diagram of the structure of the spray alkali scrubber according to the present application.
FIG. 3 is a schematic view of the structure of an alkali liquor spraying layer.
1. Charging bucket at the top of the blast furnace; 2. a secondary equalizing valve; 3. a nitrogen tank; 4. a cyclone dust collector; 5. a primary equalizing valve; 6. a muffler; 7. a pressure equalizing and diffusing 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 water remover; 15. a check valve; 16. a net gas pipe network; 17. a top gas shut-off 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 grille; 26. an alkali liquor spraying layer; 27. a long spray gun; 28. short spray gun.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
The utility model provides a blast furnace roof pressure equalizing gas recovery plant, includes blast furnace roof charging bucket 1, cyclone 4, spouts alkali wash tower 13 and dehydrator 14, and blast furnace roof charging bucket 1 passes through gas transfer line and cyclone 4's entry linkage, and cyclone 4's export passes through pressure equalizing gas recovery line and spouts the pressure equalizing gas entry linkage of alkali wash tower 13, spouts the water-containing gas export of alkali wash tower 13 and the entry linkage of dehydrator 14 through gas transfer line, as shown in figure 1.
In this embodiment, the alkali spraying washing tower 13 is internally provided with an air flow homogenizing device, an alkali liquor spraying device, a foam remover 23, an upper spraying device 22 and a water removing device 21 which are sequentially arranged from bottom to top, wherein the air flow homogenizing device comprises at least one layer of air grid 25 along the vertical direction, and the alkali liquor spraying device comprises at least one alkali liquor spraying layer 26, as shown in fig. 2.
In this embodiment, the pressure equalizing gas inlet of the alkali spraying washing tower 13 is located at the lower part of the alkali spraying washing tower 13, the gas flow equalizing device is located above the pressure equalizing gas inlet, the gas flow equalizing device comprises three layers of gas grids 25, and the adjacent two 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 this embodiment, the alkali spraying tower 13 is in 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 tower 13, the long spray guns 27 intersect at the center line of the alkali spraying tower 13, the long spray guns 27 and the short spray guns 28 are both in columnar 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 all arranged along the radial direction of the alkali spraying tower 13, namely, the length direction of the long spray guns 27 and the length direction of the short spray guns 28 are all arranged along the radial direction of the alkali spraying tower 13, and a plurality of high-pressure atomizing spray heads 24 are arranged on the long spray guns 27 and the short spray guns 28, as shown in fig. 3.
In this embodiment, the alkali liquor spraying device includes a plurality of alkali liquor spraying layers 26 disposed at intervals along a vertical direction, in two adjacent alkali liquor spraying layers 26, the spraying direction of the high pressure atomizing nozzle 24 in one alkali liquor spraying layer 26 is all upward, and the spraying direction of the high pressure atomizing nozzle 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, and as shown in fig. 2, 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 nozzles 24 in the first alkali liquor spraying layer are all upward, the spraying directions of the high-pressure atomizing nozzles 24 in the second alkali liquor spraying layer are all downward, the spraying directions of the high-pressure atomizing nozzles 24 in the third alkali liquor spraying layer are all upward, and the spraying directions of the high-pressure atomizing nozzles 24 in the fourth alkali liquor spraying layer are all downward. The bottom of the alkali spraying washing tower 13 is provided with a sewage outlet, and a sewage treatment device 18 is arranged below the outside of the sewage outlet. Dust-containing sewage generated after the gas is treated by the blast furnace top equalizing gas recovery device is treated by the sewage treatment device 18 to obtain sludge and recycled reclaimed water.
A plurality of alkaline liquor spraying layers 26 and their attendant high pressure atomizer heads 24 are arranged at different heights according to process requirements. After being sprayed out from the high-pressure atomizing nozzle 24, the alkali liquor forms an atomized state in the alkali spraying washing tower 13, and the atomized 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 chlorine removal treatment of the coal gas.
The acidic dust-containing blast furnace gas enters the spray alkali washing tower 13 from a gas inlet on the side surface of the lower part of the spray alkali washing tower 13, and the acid removal and dust removal treatment is completed under the action of atomized alkali liquor:
1. spraying alkali to remove acid: atomized alkali liquor fully distributed in the inner space of the alkali spraying washing tower 13 fully reacts with an acidic medium in the gas to eliminate the gas corrosiveness.
2. Washing and dedusting: because of inertial collision, interception and agglomeration between atomized alkali liquor and gas dust, larger-particle dust is settled by gravity along with atomized washing, is discharged together with washing liquid and enters a sewage treatment device 18 outside a 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 spraying device 22 includes a plurality of nozzles capable of spraying water to the mist eliminator 23, the water eliminator 21 is a filler water eliminator, and the water eliminator 21 is located at the upper part of the caustic soda scrubber 13. The demister 23 may be a wire mesh demister (or other efficient demister such as a folded plate demister), and the demister 23 is arranged in a space above the high-pressure atomizing nozzle 24. The dust of the smaller particles and the alkali liquor in an atomized state form mist, the gas with the mist rises at a certain speed to pass through the mist eliminator 23, and the mist eliminator 23 finishes the treatment of the smaller dust particles in the gas to obtain the water-containing clean gas. The upper spraying device 22 is arranged above the demister 23, and high-pressure water is periodically used for spraying and flushing the demister 23 through the upper spraying device 22, so that the demister 23 is prevented from being blocked after long-term use. The acidic dust-containing blast furnace gas can obtain the gas with larger water content by the action of atomized alkali liquid sprayed out by the high-pressure atomizing nozzle 24 and the demister 23.
In this embodiment, two gas outlets are disposed at the top of the alkali spraying washing tower 13, and are a water-containing gas outlet and a diffusing gas outlet, the outside of the diffusing gas outlet is connected with a diffusing valve 12, and the outside of the water-containing gas outlet is sequentially connected with a dehydrator 14, a clean gas check valve 15 and a clean gas pipe network 16, as shown in fig. 1.
A water removing device 21 (filler water removing device) is arranged above the upper spraying device 22 near the top outlet of the alkali spraying washing tower 13. The inner filler of the filler water removing device can be a garland filler (or a stainless steel garland filler or other types of fillers) made of aluminum alloy materials. When the water-containing gas passes through the water removing device 21, small water drops in the 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 water remover 14 can be a baffle type water remover (or a cyclone type water remover or other high-efficiency water removers). The primarily dewatered water-containing gas is discharged from a water-containing gas outlet at the top of the alkali spraying washing tower 13, enters a dehydrator 14 arranged at the outer side of the top of the alkali spraying washing tower 13, completes the water removal treatment of the water-containing gas, finally obtains qualified gas meeting the requirements of users, and enters a clean gas pipe network 16 for users through a clean gas check valve 15.
The top outlet of the spray alkali washing tower 13 is provided with a bleeding valve 12, and the bleeding 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 relief valve 12 is in a closed state; when the pressure exceeds the set point, the relief valve 12 automatically opens to reduce the internal pressure.
The alkali spraying washing tower 13 can respectively treat the top gas discharged from the top of the blast furnace and the equalizing gas discharged from the charging tank during the top charging of the blast furnace when the raw fuel is subjected to chemical reaction according to the process requirements, and can also simultaneously treat the top gas and the equalizing gas. The alkali spraying washing tower 13 can treat large diffused gas during the damping down of the blast furnace according to the process requirement. When the gas components meet the recovery requirement, the check valve 15 of the top outlet of the alkali spraying washing tower 13 is opened, the diffusing valve 12 is closed, and the treated top gas and the pressure equalizing gas can be normally recovered and enter the clean gas pipe network 16. When the large diffused gas with the gas components not meeting the recovery requirement is treated, the check valve 15 at the top outlet of the alkali spraying washing tower 13 is closed, the diffusing valve 12 is opened, and the gas meeting the emission requirement after dust removal and acid removal treatment is diffused into the air.
In this embodiment, the spray alkali scrubber 13 also comprises a top gas inlet, which is located in the lower part of the spray alkali scrubber 13, and a top gas supply pipe is connected to the outside of the top gas inlet of the spray alkali scrubber 13, and is provided with a top gas stop valve 17. The pressure equalizing gas recovery pipeline is provided with a thermometer 8, a flowmeter 9, a pressure gauge 10 and a pressure equalizing gas recovery valve 11, the outlet of the cyclone dust collector 4 is connected with a muffler 6 and a primary pressure equalizing system 19 which are connected in parallel, and the gas conveying pipeline is connected with a nitrogen tank 3 and a secondary pressure equalizing system 20 which are connected in series, as shown in figure 1.
In the present embodiment, the diameter and height of the caustic wash tower 13 are 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 application automatically adjusts the water spraying amount of the high-pressure atomization nozzle 24 through detecting the gas pressure, the flow rate and the flow rate at the inlet of the blast furnace gas, and improves the neutralization reaction and the dust removal effect of acidic dust-containing gas and atomized alkali liquid in the alkali spraying washing tower 13.
The alkali spraying washing tower 13 has higher dust removing 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/m 3 . The mechanical water content of the water-containing clean gas after being treated by the filler water removing device 21 and the water remover 14 is less than 7g/m 3 . The furnace top gas and the pressure equalizing gas treated by the blast furnace top pressure equalizing gas recovery device provided by the application meet the recovery requirement.
The gas grille 25, demister 23, upper spray device 22 and water removal device 21 described in the present application can all be manufactured by existing commercial products. Therefore, the alkaline spraying washing tower 13 provided by the application has the advantages of simplicity, low manufacturing cost, low maintenance cost, few movable parts, difficult occurrence of faults, high operation rate and the like, can reduce air pollution, and can realize energy conservation, emission reduction and recycling of resources.
The working process of the blast furnace top equalizing gas recovery device of the application is described below.
After the blast furnace charging system enters a charging procedure for charging a charging tank, 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 tank 1 at the top of the blast furnace and enters a cyclone dust collector 4 for coarse dust removal, and the 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 manometer 10 for measuring the temperature, the flow and the pressure of the pressure equalizing gas, and detection values of the thermometer 8, the flowmeter 9 and the manometer 10 are fed back to the blast furnace central control system in time, so that the blast furnace operation is optimized, and the blast furnace is promoted to run forward.
The equalizing gas is led to an alkali spraying washing tower 13 with acid and dust removing function after passing through an equalizing gas recovery valve 11; the top gas enters the caustic soda washing tower 13 through a top gas stop valve 17. According to the process requirement, the equalizing gas recovery valve 11 or the furnace top gas stop valve 17 can be opened respectively to treat the furnace top gas and the equalizing gas respectively; it is also possible to simultaneously open the equalizing gas recovery valve 11 or the top gas shut-off valve 17 and to simultaneously treat both the top gas and the equalizing gas.
The dust-containing sewage is treated by a sewage treatment device 18 at the bottom of the spray alkali washing tower to obtain sludge and reclaimed water, and the reclaimed water can be recycled; the water-containing clean gas enters the dehydrator 14 for treatment and then directly enters the clean gas pipe network 16 through the 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 relief valve 12 is in a closed state; when the pressure exceeds the set point, the relief valve 12 automatically opens to reduce the internal pressure.
The foregoing description of the embodiments of the application is not intended to limit the scope of the application, so that the substitution of equivalent elements or equivalent variations and modifications within the scope of the application shall fall within the scope of the patent. In addition, the technical features and the technical features, the technical features and the technical application can be freely combined for use.
Claims (2)
1. The blast furnace top pressure equalizing gas recovery device is characterized by comprising a blast furnace top charging tank (1), a cyclone dust collector (4), an alkali spraying washing tower (13) and a dehydrator (14), wherein the blast furnace top charging 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, and an aqueous gas outlet of the alkali spraying washing tower (13) is connected with an inlet of the dehydrator (14) through a gas conveying pipeline;
the alkali spraying washing tower (13) is internally provided with an air flow homogenizing device, an alkali liquid spraying device, a foam remover (23), an upper spraying device (22) and a water removing device (21) which are sequentially arranged from bottom to top, wherein the air flow homogenizing device comprises three layers of air grids (25) along the vertical direction, the adjacent two layers of air grids (25) are staggered by a set angle, and the alkali liquid spraying device comprises at least one alkali liquid spraying layer (26);
the alkali spraying washing tower (13) is of an upright cylindrical structure, one alkali spraying layer (26) comprises a plurality of long spray guns (27) and short spray guns (28) which are uniformly arranged at intervals along the circumferential direction of the alkali spraying washing tower (13), each long spray gun (27) and each short spray gun (28) are arranged along the radial direction of the alkali spraying washing tower (13), and each long spray gun (27) and each short spray gun (28) are provided with a high-pressure atomizing nozzle (24);
the alkali liquor spraying device comprises four alkali liquor spraying layers (26), wherein 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 nozzles (24) in the first alkali liquor spraying layer are all upward, the spraying directions of the high-pressure atomizing nozzles (24) in the second alkali liquor spraying layer are all downward, the spraying directions of the high-pressure atomizing nozzles (24) in the third alkali liquor spraying layer are all upward, and the spraying directions of the high-pressure atomizing nozzles (24) in the fourth alkali liquor spraying layer are all downward;
the upper spraying device (22) comprises a plurality of nozzles capable of spraying water flow to the demister (23), the water removing device (21) is a filler water removing device, the water removing device (21) is positioned at the upper part of the alkali spraying washing tower (13), the alkali spraying washing tower (13) also 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 a diffused valve (12) is connected outside the diffused gas outlet;
the bottom of the alkali spraying washing tower (13) is provided with a sewage outlet, a sewage treatment device (18) is arranged below the outside of the sewage outlet, the alkali spraying washing tower (13) also comprises a top gas inlet, a top gas supply pipeline is connected outside the top gas inlet of the alkali spraying washing tower (13), and a top gas stop valve (17) is arranged on the top gas supply pipeline.
2. The blast furnace top equalizing gas recovery device according to claim 1, wherein a thermometer (8), a flowmeter (9), a pressure gauge (10) and an equalizing gas recovery valve (11) are arranged on the equalizing gas recovery pipeline, the outlet of the cyclone dust collector (4) is connected with a silencer (6) and a primary equalizing system (19) which are connected in parallel, the gas conveying pipeline is connected with a nitrogen tank (3) and a secondary equalizing system (20) which are connected in series, and the outlet of the water remover (14) is connected with a clean gas pipe network (16).
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