CN115368940A - Blast furnace gas deacidification agent based on superfine steel slag, preparation method and deacidification system - Google Patents

Blast furnace gas deacidification agent based on superfine steel slag, preparation method and deacidification system Download PDF

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CN115368940A
CN115368940A CN202211298608.8A CN202211298608A CN115368940A CN 115368940 A CN115368940 A CN 115368940A CN 202211298608 A CN202211298608 A CN 202211298608A CN 115368940 A CN115368940 A CN 115368940A
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deacidification
gas
blast furnace
tower
furnace gas
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CN115368940B (en
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康东娟
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Beijing Zhty Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/002—Removal of contaminants
    • C10K1/003—Removal of contaminants of acid contaminants, e.g. acid gas removal
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/002—Removal of contaminants
    • C10K1/003—Removal of contaminants of acid contaminants, e.g. acid gas removal
    • C10K1/004—Sulfur containing contaminants, e.g. hydrogen sulfide
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/02—Dust removal
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/02—Dust removal
    • C10K1/024—Dust removal by filtration
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/20—Purifying combustible gases containing carbon monoxide by treating with solids; Regenerating spent purifying masses
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/20—Purifying combustible gases containing carbon monoxide by treating with solids; Regenerating spent purifying masses
    • C10K1/22—Apparatus, e.g. dry box purifiers

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  • Combustion & Propulsion (AREA)
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  • Oil, Petroleum & Natural Gas (AREA)
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Abstract

The invention discloses a blast furnace gas deacidification agent based on ultra-fine steel slag, a preparation method and a deacidification system, wherein the blast furnace gas deacidification agent comprises the following components in parts by weight: 20 to 65 portions of calcium hydroxide, 10 to 40 portions of steel slag, 5 to 15 portions of active component, 5 to 15 portions of modifier, 5 to 10 portions of foaming agent and 5 to 15 portions of bentonite. The deacidification system comprises a blast furnace, a gravity dust removal device, a bag-type dust remover, a deacidification tower, a hydrolysis tower, a pressure reducing valve bank, a desulfurization tower and a blast furnace gas cabinet which are connected in sequence, wherein the pressure reducing valve bank is connected with a TRT (blast furnace top pressure) power generation device; the blast furnace gas deacidification agent related by the invention has the advantages of simple preparation method, high deacidification capacity and long service life; because the industrial solid waste is added into the preparation raw materials, the production cost of the deacidification agent is obviously reduced, the strength of the deacidification agent is improved, and the problems of environmental pollution and resource waste caused by the industrial solid waste are solved.

Description

Blast furnace gas deacidification agent based on superfine steel slag, preparation method and deacidification system
Technical Field
The invention relates to the technical field of comprehensive utilization of resources, in particular to a blast furnace gas deacidification agent based on ultrafine steel slag, a preparation method and a deacidification system thereof.
Background
Blast furnace gas as a byproduct of the pig iron smelting process has considerable pressure, temperature and heat value, and is an important secondary energy source. In response to national promotion of energy conservation and emission reduction, development cycleThe steel enterprises are vigorously developing the dry dedusting process of blast furnace gas and the residual pressure waste heat power generation technology. However, a large amount of H still exists in the blast furnace gas after dry dedusting 2 And acid gases such as S and HCl. In the process of conveying and using the coal gas, acid liquor can be formed by the acid gas and condensed steam, the equipment pipeline can be seriously corroded, the problems of salt accumulation and scaling of TRT blades, reduction of the heat storage efficiency of the checker bricks of the hot blast stove and the like can be caused, and the normal operation of the residual pressure waste heat recovery device is seriously influenced. On the other hand, the acid gases (especially HCl) can be enriched and occupy the alkaline sites on the surface of the rear-end hydrolysis catalyst, and the hydrolysis activity of the catalyst on organic sulfur in the blast furnace gas is reduced, SO that SO in the flue gas of the rear-end blast furnace gas point is caused 2 Can not reach the national ultra-low emission index and additionally increases the subsequent desulfurization cost. Therefore, it is imperative to perform deacidification treatment on blast furnace gas.
At present, the removal process aiming at acid gas in blast furnace gas at home and abroad is mainly divided into a wet method and a dry method. The wet process is to remove the acid gas in the gas by adopting an alkali liquor spraying mode, although the acid component in the gas can be effectively reduced, the alkali liquor can cause corrosion and scaling blockage of pipelines and equipment, and simultaneously brings about the problem of deacidification waste liquid treatment, and the advantages of water saving, gas sensible heat utilization and the like of dry dedusting are counteracted to a great extent. The dry process is to utilize the solid deacidification agent to react with the acid gas in the coal gas and fix the solid deacidification agent on the deacidification agent so as to achieve the aim of removing the acid gas. The dry method is adopted, water spraying, cooling and waste liquid disposal are not needed, energy-saving and environment-friendly benefits brought by dry dedusting are retained to the maximum extent, the problems of corrosion or salt accumulation and scaling of all equipment and pipe networks including TRT can be solved, and the method has great application potential. But because the blast furnace gas has large amount of gas, lower temperature of the gas and CO 2 The content of water vapor and dust is high, and the conventional deacidification agent can not meet the indexes of deacidification effect and economy at the same time. Aiming at blast furnace gas deacidification, at present, a deacidification agent with low cost and excellent performance is absent. Therefore, a low-cost and efficient desorption was developedThe deacidification agent of the acid component in the blast furnace gas has great industrial application value.
Steel slag is a solid waste produced in the steel smelting process. With the vigorous development of the steel industry, the steel production capacity is gradually improved, the corresponding steel slag emission is gradually increased, about 2 hundred million tons of steel slag are reported to be generated every year in China, but the comprehensive utilization rate is less than 30%, so that a large amount of steel slag is piled on the earth surface, not only cultivated land is occupied, but also the environment is polluted. Therefore, it is urgent to find a reasonable and effective way to recycle industrial solid wastes. The steel slag mainly comprises 40-60% of calcium oxide, 13-20% of silicon dioxide, 3-10% of magnesium oxide, 2-8% of metallic iron, 2-8% of aluminum oxide, 1-5% of manganese oxide and the like, and can be used for SO in flue gas by utilizing the characteristic that the steel slag is rich in alkaline oxide 2 And (4) removing. Chinese patent CN 108295806B discloses a method for preparing a desulfurization adsorbent by using industrial solid wastes, the prepared desulfurization adsorbent is simple to use and can be recycled; because the industrial waste steel slag and the waste glass are added into the preparation raw materials, the strength of the desulfurization adsorbent is enhanced, the wear resistance is improved, and the production cost of the desulfurization adsorbent is obviously reduced. At present, the SO in the flue gas is removed by using steel slag 2 While there are many reports, there are only few reports on the use of steel slag as a gas deacidification agent.
The steel slag has higher content of f-CaO and f-MgO, and the f-CaO and the f-MgO can generate Ca (OH) with strong basicity on one hand after meeting water 2 And Mg (OH) 2 Can be mixed with acidic gas such as HCl and H 2 S has acid-base neutralization reaction, and on the other hand, the volume of the f-CaO and the f-MgO can be increased by 1-3 times after meeting water to form a loose structure, so that the occurrence of heterogeneous reaction is accelerated. The steel slag is used as a raw material to prepare the blast furnace gas deacidification agent, so that the acid gas in the blast furnace gas can be removed, and the influence of the acid substance on the corrosion of subsequent equipment pipelines and the influence of a catalyst can be effectively avoided. Therefore, the method for preparing the blast furnace gas deacidification agent based on the ultrafine steel slag provided by the invention not only effectively utilizes the industrial solid waste steel slag, solves the problem of solid waste pollution and relieves the problem of atmospheric pollution, but also brings great economic benefits to steel enterprisesAnd the method conforms to the development mode of resources-products-wastes-renewable resources in China.
Disclosure of Invention
The invention provides a blast furnace gas deacidification agent based on superfine steel slag, a preparation method and a deacidification system thereof, which solve the problems that the existing blast furnace gas deacidification agent has complex preparation process and high cost and is not suitable for being applied to the field of blast furnace gas deacidification.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a blast furnace gas deacidification agent based on ultra-fine steel slag is prepared from the following components in parts by weight: 20 to 65 portions of calcium hydroxide, 10 to 40 portions of steel slag, 5 to 15 portions of active component, 5 to 15 portions of modifier, 5 to 10 portions of foaming agent and 5 to 15 portions of binder.
The steel slag is waste generated in steel-making production of steel enterprises and is one or more of refining slag, converter slag and electric furnace slag.
Wherein the active component is one or two of zinc nitrate and aluminum nitrate; the modifier is one or two of sodium hydroxide, sodium carbonate, sodium bicarbonate and urea; the foaming agent is methyl cellulose.
A preparation method of a blast furnace gas deacidification agent comprises the following steps:
step 1, feeding steel slag into a wet grinder from top to bottom, mixing the steel slag with water, and carrying out wet grinding for 20-60 minutes to form steel slag slurry;
step 2, dissolving the active component in water, adding the formed uniform solution and 20-65 parts of calcium hydroxide into the steel slag slurry obtained in the step 1, and wet-grinding for 10-30 minutes to form a mixture a;
step 3, dissolving a modifier in water, slowly dropwise adding the formed uniform solution into the mixture a formed in the step 2, stirring while keeping dropwise adding, continuously stirring for 15-30 minutes after dropwise adding is finished, then placing the formed mixture into a high-pressure reaction kettle, and reacting for 2-8 hours at 150-200 ℃ in a constant-temperature air-blowing drying box; taking out after the reaction is finished, naturally cooling, and filtering to obtain a pasty solid mixture b;
step 4, placing a foaming agent and a binder into the mixture b obtained in the step 3, uniformly stirring, and performing extrusion molding to obtain a molding material;
step 5, putting the formed material obtained in the step 4 into a constant-temperature air-blast drying oven, and drying at 80-150 ℃ for 2-8 hours to obtain a primary product;
and 6, placing the primary product dried in the step 5 into a muffle furnace, roasting for 1-4 hours at 300-500 ℃, and naturally cooling to room temperature to obtain the blast furnace gas deacidification agent.
Wherein the weight ratio of the steel slag to the water in the step 1 is (10-40): (20-90); the weight ratio of the active components to the water in the step 2 is (5-15): (10-40); the weight ratio of the modifier to the water in the step 3 is (5-15): (10 to 40).
A deacidification system adopting the blast furnace gas deacidification agent comprises a blast furnace, a gravity dust removal device, a bag-type dust remover, a deacidification tower, a hydrolysis tower, a pressure reducing valve bank, a desulfurization tower and a blast furnace gas cabinet which are sequentially connected, wherein the pressure reducing valve bank is connected with a TRT (blast furnace gas recovery turbine) residual pressure power generation device; the deacidification tower comprises a cylindrical tower body, wherein the air inlet side of the tower body is connected with an air inlet reducing cone, the air inlet reducing cone is connected with a coal gas inlet pipeline, the air outlet side of the tower body is connected with an air outlet reducing cone, the air outlet reducing cone is connected with a coal gas outlet pipeline, the joint of the air inlet reducing cone and the tower body is provided with an air inlet flow uniform distribution device, the joint of the air outlet reducing cone and the tower body is provided with an air outlet flow uniform distribution device, a reaction bin for blast furnace gas deacidification is vertically arranged in the tower body, and the blast furnace gas deacidification agent is filled in the reaction bin; the top of the deacidification tower is provided with a feed inlet and a feed cut-off valve of a blast furnace gas deacidification agent, the bottom of the deacidification tower is provided with a discharge opening and a discharge cut-off valve of the blast furnace gas deacidification agent, a feed bin is arranged below the feed cut-off valve, the feed bin is positioned above the top wall of the tower body, a conical hopper is arranged above the discharge cut-off valve, the conical hopper is positioned below the bottom wall of the tower body, and the air inlet side and the air outlet side of the reaction bin are respectively provided with a rectification grid.
The device comprises a reaction cabin, a gas inlet flow uniform distribution device, a gas outlet flow uniform distribution device, a first reaction cabin, a second reaction cabin, a third gas rectification layer and a gas outlet flow uniform distribution device, wherein the two reaction cabins are a first-stage reaction cabin for coarse deacidification and a second-stage reaction cabin for fine deacidification respectively, a first gas rectification layer is formed between the gas inlet flow uniform distribution device and the first-stage reaction cabin, a second gas rectification layer is formed between the first-stage reaction cabin and the second-stage reaction cabin, and the third gas rectification layer is formed between the second-stage reaction cabin and the gas outlet flow uniform distribution device.
Wherein, the middle of the deacidification tower is provided with an access hole; the gas inlet pipeline is provided with a gas inlet pressure gauge and a gas inlet sampling inspection device, the gas outlet pipeline is provided with a gas outlet pressure gauge and a gas outlet sampling inspection device, and the middle of the deacidification tower is provided with an access hole. The gas inlet pressure gauge is used for detecting the pressure of gas in the gas inlet pipeline, the gas outlet pressure gauge is used for detecting the pressure of gas in the gas outlet pipeline, and the gas inlet sampling inspection device and the gas outlet sampling inspection device are used for detecting acid gases such as HCl and H in the blast furnace gas before and after deacidification of the gas 2 The concentration of S.
And judging whether the deacidification agent in the deacidification tower needs to be replaced or not according to the indication number of the gas sampling inspection device. If the concentration of HCl displayed in the gas outlet sampling inspection device is more than 10mg/Nm 3 In the case of the acid scavenger, it means that the acid scavenger has failed and it is necessary to replace it with a new one.
Wherein, the blast furnace gas deacidification agent has the appearance of honeycomb, clover, hollow sphere or hollow column, and is used in a gas pretreatment section at the front end of the blast furnace gas fine desulfurization process for removing acid gases such as HCl and H in the blast furnace gas 2 S and the like. The use pressure of the deacidification agent in the deacidification tower is 210-230 kPa, the use temperature is 120-180 ℃, and the space velocity of coal gas passing through the deacidification tower is 1000-3000 h -1 The failure condition of the bed layer is that the HCl concentration in the coal gas after the deacidification tower is more than 10mg/Nm 3 。
The blast furnace gas and the deacidification agent are arranged in a cross flow mode. The cross flow mode refers to the flow direction of the blast furnace gas and the flow direction of the blast furnace gas deacidification agent are vertical. Specifically, in the deacidification process, blast furnace gas enters the inside of the deacidification tower from a gas inlet pipeline on one side of the deacidification tower to be deacidified, the deacidified gas flows out from a gas outlet pipeline on the other side of the deacidification tower, and the flowing direction of the gas is horizontal. In the deacidification tower, the deacidification agent enters the inside of the deacidification tower from a feed inlet at the top of the deacidification tower through a feed bin, after the deacidification agent is used for a period of time, the deacidification agent which is out of service is discharged out of the deacidification tower through a discharge outlet at the bottom of the deacidification tower, and the flow direction of the blast furnace gas deacidification agent is vertical. The benefits of such a cross-flow approach as described are: on one hand, the gas pressure loss (less than 500 Pa/m) before and after deacidification can be reduced to the maximum extent, and the operation of a rear-end TRT (blast furnace top gas recovery turbine) residual pressure power generation device is not influenced; on the other hand, the deacidification tower adopting the cross flow mode has small occupied area, small body weight and large function, and is very suitable for being used in the limited space of the deacidification site.
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) the blast furnace gas deacidification agent related by the invention has the advantages of simple preparation method, high deacidification capacity and long service life; because the industrial solid waste is added into the preparation raw materials, the production cost of the deacidification agent is obviously reduced, the strength of the deacidification agent is improved, and the problems of environmental pollution and resource waste of the industrial solid waste are solved.
(2) The deacidification agent is prepared by a wet-method fine grinding combined hydrothermal preparation method, and on one hand, the full hydration of CaO in the steel slag to generate Ca (OH) is promoted 2 The active deacidification components are equal, simultaneously, a large amount of lattice defects are formed in the steel slag, the dispersion degree of the active components in the lattices is improved, and the deacidification performance is improved. On the other hand, the wet fine grinding process of the steel slag improves the dispersion degree of the gelling components in the steel slag, thereby improving the overall mechanical strength of the deacidification agent.
(3) The deacidification agent provided by the invention has the advantages that the modifier is added in the preparation process, so that the number of alkaline active centers on the surface of the deacidification agent is increased, and the deacidification performance of the deacidification agent can be obviously improved.
(4) The deacidification agent and the deacidification system are used in front of a blast furnace gas hydrolysis system, can effectively protect a rear-end hydrolysis agent from being poisoned, remarkably prolong the service life of the hydrolysis agent, reduce the corrosion of subsequent equipment and meet the requirement of a rear-end user on SO 2 Ultra-low emission requirements;
(5) the whole deacidification system has no wastewater discharge, does not increase the water content of the coal gas, does not reduce the heat value of the coal gas, and does not influence the subsequent TRT power generation.
(6) The cross-flow type deacidification system can reduce the pressure loss (less than 500 Pa/m) of coal gas before and after deacidification to the maximum extent and ensure that the operation of a rear-end TRT (Top gas recovery turbine) residual pressure power generation device is not influenced; on the other hand, the whole deacidification system occupies a small area and is very suitable for the use in the limited space of the deacidification site.
Drawings
FIG. 1 is a process flow diagram of a deacidification system in accordance with the present invention;
FIG. 2 is a schematic side view of the acid removal column of the present invention;
FIG. 3 is a schematic top view of the acid removal column of the present invention;
in the figure, 1, a blast furnace; 2. a gravity dust removal device; 3. a bag-type dust collector; 4. a deacidification tower; 5. a hydrolysis tower; 6. a TRT residual pressure power generation device; 7. a pressure relief valve bank; 8. a desulfurizing tower; 9. a blast furnace gas cabinet; 41. the tower body, 42 inlet reducing cones, 43 gas inlet pipelines, 44 outlet reducing cones, 45 gas outlet pipelines, 46 inlet flow uniform distribution devices, 47 outlet flow uniform distribution devices, 48 reaction bins, 49 feed inlets, 410 feed stop valves, 411 discharge outlets, 412 discharge stop valves, 413 feed bins, 414 conical hoppers, 415 rectifying grids, 416 first gas rectifying layers, 417 second gas rectifying layers, 418 third gas rectifying layers, 419 maintenance ports, 420 inlet pressure gauges, 421 inlet gas sampling inspection devices, 422 outlet pressure gauges, 423 outlet gas sampling inspection devices.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to specific embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The embodiment provides a blast furnace gas deacidification agent based on ultrafine steel slag, which comprises the following components in parts by weight: 40 parts of calcium hydroxide, 25 parts of steel slag, 10 parts of zinc nitrate, 10 parts of sodium hydroxide, 5 parts of methyl cellulose and 10 parts of bentonite.
Wherein the steel slag is waste generated in steel-making production by steel enterprises and is refining slag.
The embodiment provides a preparation method of the blast furnace gas deacidification agent, which comprises the following steps:
step 1, feeding 25 parts of steel slag into a wet grinder from top to bottom according to parts by weight, mixing the steel slag with 55 parts of water, and carrying out wet grinding for 40 minutes to form steel slag slurry;
step 2, dissolving 10 parts by weight of zinc nitrate in 25 parts by weight of water, adding the formed uniform solution and 40 parts by weight of calcium hydroxide into the steel slag slurry obtained in the step 1, and wet-grinding for 20 minutes to form a mixture a;
step 3, dissolving 10 parts by weight of sodium hydroxide in 25 parts by weight of water, slowly dropwise adding the formed uniform solution into the mixture a formed in the step 2, stirring while dropwise adding, continuously stirring for 20 minutes after dropwise adding is finished, then placing the formed mixture into a high-pressure reaction kettle, and reacting for 6 hours at 180 ℃ in a constant-temperature air-blowing drying oven; taking out after the reaction is finished, naturally cooling, and filtering to obtain a pasty solid mixture b;
step 4, placing 5 parts by weight of methylcellulose and 10 parts by weight of bentonite into the mixture b obtained in the step 3, uniformly stirring, and performing extrusion molding to obtain a molding material;
step 5, placing the formed material obtained in the step 4 into a constant-temperature air-blast drying oven, and drying for 5 hours at 100 ℃ to obtain a primary product;
and 6, placing the primary product dried in the step 5 into a muffle furnace, roasting for 2.5 hours at 400 ℃, and naturally cooling to room temperature to obtain the blast furnace gas deacidification agent.
In this embodiment, the deacidification system using the blast furnace gas deacidification agent, as shown in fig. 1 to fig. 3, includes a blast furnace 1, a gravity dust removal device 2, a bag-type dust remover 3, a deacidification tower 4, a hydrolysis tower 5, a pressure-reducing valve bank 7, a desulfurization tower 8 and a blast furnace gas cabinet 9, which are connected in sequence, where the pressure-reducing valve bank 7 is connected with a TRT residual pressure power generation device 6; the deacidification tower 4 comprises a cylindrical tower body 41, the air inlet side of the tower body 41 is connected with an air inlet reducing cone 42, the air inlet reducing cone 42 is connected with a gas inlet pipeline 43, the air outlet side of the tower body 41 is connected with an air outlet reducing cone 44, the air outlet reducing cone 44 is connected with a gas outlet pipeline 45, the joint of the air inlet reducing cone 42 and the tower body 41 is provided with an air inlet flow uniform distribution device 46, the joint of the air outlet reducing cone 44 and the tower body 41 is provided with an air outlet flow uniform distribution device 47, a reaction bin 48 for blast furnace gas deacidification is vertically arranged in the tower body 41, and the blast furnace gas deacidification agent is filled in the reaction bin 48; the top of the deacidification tower 4 is provided with a feed inlet 49 and a feed cut-off valve 410 of a blast furnace gas deacidification agent, the bottom of the deacidification tower 4 is provided with a discharge port 411 and a discharge cut-off valve 412 of the blast furnace gas deacidification agent, a feed bin is arranged below the feed cut-off valve 410 and is positioned above the top wall of the tower body 41, a conical hopper is arranged above the discharge cut-off valve and is positioned below the bottom wall of the tower body 41, and the air inlet side and the air outlet side of the reaction bin 48 are respectively provided with a rectification grid 415.
The reaction bins 48 are two, namely a primary reaction bin for coarse deacidification and a secondary reaction bin for fine deacidification, a first gas rectification layer 416 is formed between the inlet gas flow uniform distribution device 46 and the primary reaction bin, a second gas rectification layer 417 is formed between the primary reaction bin and the secondary reaction bin, and a third gas rectification layer 418 is formed between the secondary reaction bin and the outlet gas flow uniform distribution device 47.
Wherein, a maintenance port 419 is arranged in the middle of the deacidification tower 4; the gas inlet pipeline 43 is provided with a gas inlet pressure gauge 420 and a gas inlet sampling inspection device 421, the gas outlet pipeline 45 is provided with a gas outlet pressure gauge 422 and a gas outlet sampling inspection device 423, and the middle of the deacidification tower 4 is provided with an access hole 419. The gas inlet pressure gauge 420 is used for detecting the pressure of gas in the gas inlet pipeline 43, the gas outlet pressure gauge 422 is used for detecting the pressure of gas in the gas outlet pipeline 45, and the gas inlet sampling detection device 421 and the gas outlet sampling detection device 423 are used for detecting gas removalAcid gases such as HCl and H in blast furnace gas before and after acid 2 The concentration of S. And judging whether the deacidification agent in the deacidification tower 4 needs to be replaced or not according to the indication number of the gas sampling device. If the concentration of HCl displayed in the gas outlet sampling inspection device is more than 10mg/Nm 3 If so, the deacidification agent is exhausted and needs to be replaced by a new deacidification agent.
Wherein, the blast furnace gas deacidification agent has a honeycomb shape, and is used for a gas pretreatment section at the front end of a blast furnace gas fine desulfurization process to remove acid gases such as HCl and H in the blast furnace gas 2 And S and the like. The use pressure of the deacidification agent in the deacidification tower 4 is 220kPa, the use temperature is 150 ℃, and the space velocity of coal gas passing through the deacidification tower 4 is 2000h -1 The failure condition of the bed layer is that the HCl concentration in the coal gas after the deacidification tower 4 is more than 10mg/Nm 3 。
When the deacidification device works, the feed inlet cut-off valve is opened, and the deacidification agent prepared in the embodiment is filled into the first-stage reaction bin and the second-stage reaction bin from the feed inlet and the feed bin at the top of the deacidification tower 4 and is used for the deacidification treatment of blast furnace gas. After deacidification, the concentration of HCl in the gas detected from the gas sampling inspection device is 2mg/Nm 3 The breakthrough chlorine capacity was about 25%, as shown in table 1. After the operation is carried out for a period of time, when the concentration of HCl in the gas detected by the gas sampling device is more than 10mg/Nm 3 The deacidification agent is considered to have failed and needs to be replaced with a new deacidification agent. At this time, the deacidification agent having failed by opening the discharge gate valve is discharged out of the deacidification tower 4 through the hopper and the discharge port 411. After the feeding or discharging operation is completed, the feed cut-off valve 410 or the discharge cut-off valve 412 is ensured to be in a closed state.
Blast furnace gas subjected to dry cloth bag dust removal enters the deacidification tower 4 from a gas inlet pipeline 43, flows through the gas inlet reducing cone 42, the gas inlet flow uniform distribution device 46 and the first gas rectification layer 416, enters the primary reaction bin from the rectification grid 415 on one side of the reaction bin for coarse deacidification, flows out from the rectification grid 415 on the other side of the primary reaction bin, and enters the second gas rectification layer 417, so that the gas subjected to coarse deacidification is uniformly mixed. The uniformly mixed gas enters the secondary reaction bin through the rectification grid 415 for fine deacidification, and the finely deacidified gas flows out from the rectification grid 415 on the other side of the secondary reaction bin and enters the third gas rectification layer 418, so that the uniform mixing of the finely deacidified gas is realized. The uniformly mixed gas passes through the gas outlet flow uniform distribution device 47 and the gas outlet reducing cone 44 and then enters the gas outlet pipeline 45, so that the deacidification of the whole blast furnace gas is completed.
Example 2
The embodiment provides a blast furnace gas deacidification agent based on superfine steel slag, which comprises the following components in parts by weight: 20 parts of calcium hydroxide, 40 parts of steel slag, 5 parts of aluminum nitrate, 15 parts of sodium carbonate, 5 parts of methyl cellulose and 15 parts of bentonite.
Wherein the steel slag is waste generated in steel-making production by steel enterprises and is converter slag.
The embodiment provides a preparation method of the blast furnace gas deacidification agent, which comprises the following steps:
step 1, feeding 40 parts of steel slag into a wet grinder from top to bottom according to parts by weight, mixing the steel slag with 90 parts of water, and carrying out wet grinding for 20 minutes to form steel slag slurry;
step 2, dissolving 5 parts of aluminum nitrate in 10 parts of water by weight, adding the formed uniform solution and 20 parts of calcium hydroxide into the steel slag slurry obtained in the step 1, and wet-grinding for 10 minutes to form a mixture a;
step 3, dissolving 15 parts by weight of sodium carbonate in 40 parts by weight of water, slowly dropwise adding the formed uniform solution into the mixture a formed in the step 2, keeping stirring while dropwise adding, continuously stirring for 30 minutes after dropwise adding is finished, then placing the formed mixture into a high-pressure reaction kettle, and reacting for 8 hours at 150 ℃ in a constant-temperature air-blowing drying oven; taking out after the reaction is finished, naturally cooling, and filtering to obtain a pasty solid mixture b;
step 4, placing 5 parts by weight of methylcellulose and 15 parts by weight of bentonite into the mixture b obtained in the step 3, uniformly stirring, and performing extrusion molding to obtain a molding material;
step 5, placing the formed material obtained in the step 4 into a constant-temperature air-blast drying oven, and drying for 8 hours at 80 ℃ to obtain a primary product;
and 6, placing the primary product dried in the step 5 into a muffle furnace, roasting for 4 hours at 300 ℃, and naturally cooling to room temperature to obtain the blast furnace gas deacidification agent.
The deacidification system of this example was the same as that of example 1, and the blast furnace gas deacidification agent of this example was used.
Wherein the blast furnace gas deacidification agent has a clover shape, and is used for a gas pretreatment section at the front end of a blast furnace gas fine desulfurization process to remove acid gases such as HCl and H in the blast furnace gas 2 S and the like. The use pressure of the deacidification agent in the deacidification tower 4 is 210kPa, the use temperature is 180 ℃, and the space velocity of coal gas passing through the deacidification tower 4 is 1000h -1 The failure condition of the bed layer is that the HCl concentration in the coal gas after the deacidification tower 4 is more than 10mg/Nm 3 。
When the deacidification device works, the feed inlet cut-off valve is opened, and the deacidification agent prepared in the embodiment is filled into the first-stage reaction bin and the second-stage reaction bin from the feed inlet and the feed bin at the top of the deacidification tower 4 and is used for the deacidification treatment of blast furnace gas. After deacidification, the concentration of HCl in the coal gas is detected to be 2mg/Nm from a gas sampling inspection device 3 The breakthrough chlorine capacity was about 22%, as shown in table 1. After running for a period of time, when the concentration of HCl in the gas detected by the gas sampling device is more than 10mg/Nm 3 The deacidification agent is considered to have failed and needs to be replaced with a new deacidification agent. At this time, the discharge cut valve is opened, and the spent deacidification agent is discharged out of the deacidification tower 4 through the hopper and the discharge port 411. After the feeding or discharging operation is completed, the feeding shut valve 410 or the discharging shut valve 412 is ensured to be in a closed state.
Example 3
The embodiment provides a blast furnace gas deacidification agent based on ultrafine steel slag, which comprises the following components in parts by weight: 65 parts of calcium hydroxide, 10 parts of steel slag, 15 parts of zinc nitrate, 5 parts of sodium bicarbonate, 10 parts of methyl cellulose and 5 parts of bentonite.
Wherein the steel slag is waste generated in steel-making production of steel enterprises and is electric furnace slag
The embodiment provides a preparation method of the blast furnace gas deacidification agent, which comprises the following steps:
step 1, feeding 10 parts of steel slag into a wet grinder from top to bottom according to parts by weight, mixing the steel slag with 20 parts of water, and carrying out wet grinding for 60 minutes to form steel slag slurry;
step 2, dissolving 15 parts of zinc nitrate in 40 parts of water according to parts by weight, adding the formed uniform solution and 65 parts of calcium hydroxide into the steel slag slurry obtained in the step 1, and wet-grinding for 30 minutes to form a mixture a;
step 3, dissolving 5 parts by weight of sodium bicarbonate in 10 parts by weight of water, slowly dropwise adding the formed uniform solution into the mixture a formed in the step 2, stirring while dropwise adding, continuously stirring for 15 minutes after dropwise adding is finished, then placing the formed mixture into a high-pressure reaction kettle, and reacting for 2 hours at 200 ℃ in a constant-temperature air-blast drying oven; taking out after the reaction is finished, naturally cooling, and filtering to obtain a pasty solid mixture b;
step 4, putting 10 parts by weight of methylcellulose and 5 parts by weight of bentonite into the mixture b obtained in the step 3, uniformly stirring, and performing extrusion molding to obtain a molding material;
step 5, placing the formed material obtained in the step 4 into a constant-temperature air blast drying box, and drying for 2 hours at 150 ℃ to obtain a primary product;
and 6, placing the primary product dried in the step 5 into a muffle furnace, roasting for 1 hour at 500 ℃, and naturally cooling to room temperature to obtain the blast furnace gas deacidification agent.
The deacidification system of this example was the same as that of example 1, and the blast furnace gas deacidification agent of this example was used.
Wherein the blast furnace gas deacidification agent has a hollow sphere appearance, and is used for a gas pretreatment section at the front end of a blast furnace gas fine desulfurization process to remove acid gases such as HCl and H in the blast furnace gas 2 S and the like. The use pressure of the deacidification agent in the deacidification tower 4 is 230kPa, the use temperature is 120 ℃, and the space velocity of coal gas passing through the deacidification tower 4 is 3000h -1 The failure condition of the bed layer is that the HCl concentration in the coal gas after the deacidification tower 4 is more than 10mg/Nm 3 。
When the deacidification agent is in operation, the feeding stop valve is opened, and the deacidification agent prepared in the embodiment is filled into the primary reaction bin and the secondary reaction bin from the feeding hole and the feeding bin at the top of the deacidification tower 4, so as to be used for the deacidification treatment of blast furnace gas. After deacidification, the gas is sampled and inspectedThe concentration of HCl in the gas is detected to be 2mg/Nm 3 The breakthrough chlorine capacity was about 26%, as shown in table 1. After the operation is carried out for a period of time, when the concentration of HCl in the gas detected by the gas sampling device is more than 10mg/Nm 3 The deacidification agent is considered to have failed and needs to be replaced with a new deacidification agent. At this time, the discharge cut valve is opened, and the spent deacidification agent is discharged out of the deacidification tower 4 through the hopper and the discharge port 411. After the feeding or discharging operation is completed, the feed cut-off valve 410 or the discharge cut-off valve 412 is ensured to be in a closed state.
Example 4
The embodiment provides a blast furnace gas deacidification agent based on ultrafine steel slag, which comprises the following components in parts by weight: 45 parts of calcium hydroxide, 25 parts of steel slag, 12 parts of zinc nitrate, 8 parts of sodium carbonate, 5 parts of methyl cellulose and 5 parts of bentonite.
The embodiment provides a preparation method of the blast furnace gas deacidification agent, which comprises the following steps:
step 1, feeding 25 parts by weight of steel slag into a wet grinder from top to bottom, mixing the steel slag with 60 parts by weight of water, and carrying out wet grinding for 45 minutes to form steel slag slurry;
step 2, dissolving 12 parts of zinc nitrate in 25 parts of water by weight, adding the formed uniform solution and 50 parts of calcium hydroxide into the steel slag slurry obtained in the step 1, and wet-grinding for 25 minutes to form a mixture a;
step 3, dissolving 8 parts by weight of sodium carbonate in 20 parts by weight of water, slowly dropwise adding the formed uniform solution into the mixture a formed in the step 2, stirring while dropwise adding, continuously stirring for 20 minutes after dropwise adding is finished, then placing the formed mixture into a high-pressure reaction kettle, and reacting for 7 hours at 180 ℃ in a constant-temperature air-blast drying oven; taking out after the reaction is finished, naturally cooling, and filtering to obtain a pasty solid mixture b;
step 4, placing 5 parts by weight of methyl cellulose and 5 parts by weight of bentonite into the mixture b obtained in the step 3, uniformly stirring, and performing extrusion molding to obtain a molding material;
step 5, placing the formed material obtained in the step 4 into a constant-temperature air blast drying box, and drying for 5 hours at 100 ℃ to obtain a primary product;
and 6, placing the primary product dried in the step 5 into a muffle furnace, roasting for 2 hours at 400 ℃, and naturally cooling to room temperature to obtain the blast furnace gas deacidification agent.
The deacidification system of this example was the same as that of example 1, and the blast furnace gas deacidification agent of this example was used.
Wherein, the blast furnace gas deacidification agent has a hollow column shape, is used for a gas pretreatment section at the front end of a blast furnace gas fine desulfurization process and is used for removing acid gases such as HCl and H in the blast furnace gas 2 S and the like. The use pressure of the deacidification agent in the deacidification tower 4 is 225kPa, the use temperature is 170 ℃, and the space velocity of coal gas passing through the deacidification tower 4 is 2500h -1 The failure condition of the bed layer is that the HCl concentration in the coal gas after the deacidification tower 4 is more than 10mg/Nm 3 。
When the deacidification agent is in work, the cut-off valve of the feeding port is opened, and the deacidification agent prepared in the embodiment is filled into the primary reaction bin and the secondary reaction bin from the feeding port and the feeding bin at the top of the deacidification tower 4 and is used for the deacidification treatment of blast furnace gas. After deacidification, the concentration of HCl in the coal gas is detected to be 2mg/Nm from a gas sampling inspection device 3 The breakthrough chlorine capacity was about 28%, as shown in table 1. After running for a period of time, when the concentration of HCl in the gas detected by the gas sampling device is more than 10mg/Nm 3 The deacidification agent is considered to have failed and needs to be replaced with a new deacidification agent. At this time, the discharge cut valve is opened, and the spent deacidification agent is discharged out of the deacidification tower 4 through the hopper and the discharge port 411. After the feeding or discharging operation is completed, the feed cut-off valve 410 or the discharge cut-off valve 412 is ensured to be in a closed state.
Comparative example 1
The present example provides a blast furnace gas deacidification agent based on ultra-fine steel slag, and a preparation method and a deacidification system thereof, which are different from those in example 1 only in that 65 parts of steel slag is used to prepare a blast furnace gas pretreatment product without using calcium hydroxide.
The feed inlet cut-off valve is opened, and the deacidification agent prepared in the embodiment is filled into the primary reaction bin and the secondary reaction bin from the feed inlet and the feed bin at the top of the deacidification tower 4 and is used for the deacidification treatment of the blast furnace gas. After deacidification, from gaseous selective examination deviceThe concentration of HCl in the gas is detected to be 2mg/Nm 3 The breakthrough chlorine capacity was about 7%, as shown in table 1. After the operation is carried out for a period of time, when the concentration of HCl in the gas detected by the gas sampling device is more than 10mg/Nm 3 The deacidification agent is considered to have failed and needs to be replaced with a new deacidification agent. At this time, the discharge cut valve is opened, and the spent deacidification agent is discharged out of the deacidification tower 4 through the hopper and the discharge port 411. After the feeding or discharging operation is completed, it is ensured that the feed cut-off valve 410 or the discharge cut-off valve 412 is in a closed state.
Comparative example 2
This example provides a blast furnace gas deacidification agent based on ultra-fine steel slag, and a preparation method and a deacidification system thereof, which are different from those of example 3 only in that 65 parts of calcium hydroxide is used to prepare a blast furnace gas pretreatment product without using steel slag.
And opening a feed inlet cut-off valve, and filling the deacidification agent prepared in the embodiment into a primary reaction bin and a secondary reaction bin from a feed inlet and a feed bin at the top of the deacidification tower 4 for deacidification treatment of blast furnace gas. After deacidification, the concentration of HCl in the coal gas is detected to be 2mg/Nm from a gas sampling inspection device 3 The breakthrough chlorine capacity was about 24%, as shown in table 1. After the operation is carried out for a period of time, when the concentration of HCl in the gas detected by the gas sampling device is more than 10mg/Nm 3 The deacidification agent is considered to have failed and needs to be replaced with a new deacidification agent. At this time, the discharge cut valve is opened, and the spent deacidification agent is discharged out of the deacidification tower 4 through the hopper and the discharge port 411. After the feeding or discharging operation is completed, the feeding shut valve 410 or the discharging shut valve 412 is ensured to be in a closed state.
Comparative example 3
This example provides a blast furnace gas deacidification agent based on ultra-fine steel slag, and a preparation method and a deacidification system thereof, which are different from those of example 4 only in that 53 parts of calcium hydroxide is used to prepare a blast furnace gas pretreatment product without using sodium bicarbonate.
The feed inlet cut-off valve is opened, and the deacidification agent prepared in the embodiment is filled into the primary reaction bin and the secondary reaction bin from the feed inlet and the feed bin at the top of the deacidification tower 4 and is used for the deacidification treatment of the blast furnace gas. Through a processAfter deacidification, the concentration of HCl in the coal gas is detected to be 2mg/Nm from a gas sampling inspection device 3 The breakthrough chlorine capacity was about 15%, as shown in table 1. After the operation is carried out for a period of time, when the concentration of HCl in the gas detected by the gas sampling device is more than 10mg/Nm 3 The deacidification agent is considered to have failed and needs to be replaced with a new deacidification agent. At this time, the discharge cut valve is opened, and the spent deacidification agent is discharged out of the deacidification tower 4 through the hopper and the discharge port 411. After the feeding or discharging operation is completed, the feeding shut valve 410 or the discharging shut valve 412 is ensured to be in a closed state.
Examples of the experiments
The performance of the blast furnace gas deacidification agents of examples 1 to 4 and comparative examples 1 to 3 was examined, and the deacidification performance of the deacidification agent was judged by using HCl present in the blast furnace gas as a representative acid gas. The deacidification agent with the grain diameter of 5mm is arranged in a vertical fixed bed reactor (phi 50mm multiplied by 300 mm), the reaction temperature is controlled at 150 ℃, and the volume ratio of chemical components of the simulated blast furnace gas is controlled to be CO/CO 2 /N 2 /H 2 =28/12/59/1, the gas flow is controlled at 5L/min, and the initial mass concentration of HCl gas in the gas is controlled at 2000mg/m 3 . Detecting the concentration of HCl in the outlet gas by ion chromatography, wherein when the concentration of HCl in the outlet gas is more than 2mg/m 3 When the deacidification agent is considered to have penetrated, the time from the start of aeration to the time when the deacidification agent is penetrated is defined as the penetration time; the mass fraction of the absorbed chlorine at the breakthrough of the deacidification agent is called the breakthrough chlorine capacity, and the performance of the deacidification agent is evaluated by using the breakthrough chlorine capacity. The mechanical strength of the deacidification agent is determined by referring to a testing method of the crushing resistance of the HG/T2783-2020 molecular sieve. And (3) determining the bulk density of the deacidification agent by referring to the bulk density of part 1 of a test method of the coal granular activated carbon for desulfurization and denitrification in GB/T30202.1-2013.
TABLE 1 Deacidification agent Performance index test results
Figure 314038DEST_PATH_IMAGE001
As shown in Table 1, it can be seen from the test results of example 3 and comparative example 2 that the deacidification agent after adding steel slag has a compressive strength in the radial direction and a penetrating chlorine capacity in comparison with the deacidification agent without adding steel slagAll have great improvement. The reason is that in the preparation process of the deacidification agent, caO in the steel slag is fully hydrolyzed and converted into Ca (OH) after the steel slag is finely ground by a wet method 2 And alkaline substances, which are highly active deacidifying components. The steel slag and the calcium hydroxide which are finely ground by the wet method have higher surface energy, more lattice defects are formed inside the steel slag and the calcium hydroxide, and the dispersity of the active components in the lattices is improved, so that the deacidification performance is improved. On the other hand, the steel slag contains a large amount of gelling substances such as tricalcium silicate, dicalcium silicate and the like, the f-CaO in the steel slag is further hydrated by wet fine grinding, and meanwhile, the fine grinding energy is converted into the internal energy and the surface energy of the steel slag powder along with the lattice distortion in the steel slag, so that the gelling property of the steel slag is further improved, and the mechanical strength of the deacidification agent is greatly improved.
From the test results of example 4 and comparative example 3, it can be seen that the deacidification agent with the modifier added has significantly improved penetrating chlorine capacity, because the addition of the modifier increases the amount of surface alkaline activity neutrality of the deacidification agent, thereby improving the overall deacidification performance.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.

Claims (9)

1. A blast furnace gas deacidification agent based on ultra-fine steel slag is characterized by comprising the following components in parts by weight: 20 to 65 portions of calcium hydroxide, 10 to 40 portions of steel slag, 5 to 15 portions of active component, 5 to 15 portions of modifier, 5 to 10 portions of foaming agent and 5 to 15 portions of bentonite.
2. The blast furnace gas deacidification agent based on the ultrafine steel slag according to claim 1, wherein the steel slag is one or more of refining slag, converter slag and electric furnace slag from waste generated in steel making production of steel enterprises.
3. The ultra-fine steel slag-based blast furnace gas deacidification agent according to claim 1, wherein said active component is one or both of zinc nitrate and aluminum nitrate; the modifier is one or two of sodium hydroxide, sodium carbonate, sodium bicarbonate and urea; the foaming agent is methylcellulose.
4. A method for producing the blast furnace gas deacidification agent according to any one of the claims 1 to 3, characterized by comprising the steps of:
step 1, feeding steel slag into a wet grinder from top to bottom, mixing the steel slag with water, and carrying out wet grinding for 20-60 minutes to form steel slag slurry;
step 2, dissolving active components in water, adding the formed uniform solution and calcium hydroxide into the steel slag slurry obtained in the step 1, and wet-grinding for 10-30 minutes to form a mixture a;
step 3, dissolving a modifier in water, slowly dropwise adding the formed uniform solution into the mixture a formed in the step 2, stirring while keeping dropwise adding, continuously stirring for 15-30 minutes after dropwise adding is finished, then placing the formed mixture into a high-pressure reaction kettle, and reacting for 2-8 hours at 150-200 ℃ in a constant-temperature air-blowing drying box; taking out after the reaction is finished, naturally cooling, and filtering to obtain a pasty solid mixture b;
step 4, placing a foaming agent and a binder into the mixture b obtained in the step 3, uniformly stirring, and performing extrusion molding to obtain a molding material;
step 5, putting the formed material obtained in the step 4 into a constant-temperature air-blast drying oven, and drying at 80-150 ℃ for 2-8 hours to obtain a primary product;
and 6, placing the primary product dried in the step 5 into a muffle furnace, roasting for 1-4 hours at 300-500 ℃, and naturally cooling to room temperature to obtain the blast furnace gas deacidification agent.
5. The method for preparing the blast furnace gas deacidification agent according to the claim 4, wherein the weight ratio of the steel slag to the water in the step 1 is (10-40): (20 to 90); the weight ratio of the active components to the water in the step 2 is (5-15): (10-40); the weight ratio of the modifier to the water in the step 3 is (5-15): (10 to 40).
6. A deacidification system using the blast furnace gas deacidification agent according to any one of claims 1 to 3, which comprises a blast furnace, a gravity dust removing device, a bag-type dust remover, a deacidification tower, a hydrolysis tower, a pressure reducing valve bank, a desulfurization tower and a blast furnace gas tank which are connected in sequence, wherein the pressure reducing valve bank is connected with a TRT (blast furnace top gas pressure recovery turbine) residual pressure power generation device; the deacidification tower comprises a cylindrical tower body, wherein the air inlet side of the tower body is connected with an air inlet reducing cone, the air inlet reducing cone is connected with a coal gas inlet pipeline, the air outlet side of the tower body is connected with an air outlet reducing cone, the air outlet reducing cone is connected with a coal gas outlet pipeline, the joint of the air inlet reducing cone and the tower body is provided with an air inlet flow uniform distribution device, the joint of the air outlet reducing cone and the tower body is provided with an air outlet flow uniform distribution device, a reaction bin for blast furnace gas deacidification is vertically arranged in the tower body, and the blast furnace gas deacidification agent is filled in the reaction bin; the top of the deacidification tower is provided with a feed inlet and a feed cut-off valve of a blast furnace gas deacidification agent, the bottom of the deacidification tower is provided with a discharge opening and a discharge cut-off valve of the blast furnace gas deacidification agent, a feed bin is arranged below the feed cut-off valve, the feed bin is positioned above the top wall of the tower body, a conical hopper is arranged above the discharge cut-off valve, the conical hopper is positioned below the bottom wall of the tower body, and the air inlet side and the air outlet side of the reaction bin are respectively provided with a rectification grid.
7. The deacidification system according to claim 6, wherein the reaction bins are two, namely a primary reaction bin for crude deacidification and a secondary reaction bin for refined deacidification, a first gas rectification layer is formed between the inlet flow uniform distribution device and the primary reaction bin, a second gas rectification layer is formed between the primary reaction bin and the secondary reaction bin, and a third gas rectification layer is formed between the secondary reaction bin and the outlet flow uniform distribution device.
8. The deacidification system according to claim 6, wherein a service port is arranged in the middle of the deacidification tower; the gas inlet pipeline is provided with a gas inlet pressure gauge and a gas inlet sampling inspection device, the gas outlet pipeline is provided with a gas outlet pressure gauge and a gas outlet sampling inspection device, and the middle of the deacidification tower is provided with an access hole.
9. The deacidification system according to claim 6, wherein the deacidification agent in the deacidification tower has the use pressure of 210-230 kPa, the use temperature of 120-180 ℃, and the space velocity of coal gas passing through the deacidification tower of 1000-3000 h -1 The failure condition of the bed layer is that the HCl concentration in the coal gas after the deacidification tower is more than 10mg/Nm 3 。
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