CN113584241B - Dry-method simultaneous desulfurization and dechlorination system and method for blast furnace gas - Google Patents
Dry-method simultaneous desulfurization and dechlorination system and method for blast furnace gas Download PDFInfo
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- CN113584241B CN113584241B CN202110892646.5A CN202110892646A CN113584241B CN 113584241 B CN113584241 B CN 113584241B CN 202110892646 A CN202110892646 A CN 202110892646A CN 113584241 B CN113584241 B CN 113584241B
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Abstract
The invention discloses a blast furnace gas dry method simultaneous desulfurization and dechlorination system, which comprises a dedusted blast furnace clean gas supply subsystem, a cooperative desulfurization and dechlorination tower subsystem and a cooperative deacidification agent replacement subsystem; the clean gas generated by the blast furnace top after passing through the gravity dust collector and the bag-type dust collector is sent into the deacidification subsystem of the cooperative desulfurization and dechlorination tower through a gas input pipeline by the dedusted blast furnace clean gas supply subsystem, the subsystem is connected behind the gas input pipeline, a cooperative deacidification agent bed layer is arranged in the middle of the cooperative desulfurization and dechlorination tower, and a cooperative deacidification agent is filled in the cooperative deacidification agent bed layer.
Description
Technical Field
The invention relates to the technical field of blast furnace gas purification, in particular to a system and a method for simultaneous desulfurization and dechlorination of blast furnace gas by a dry method.
Background
At present, in the field of blast furnace gas purification, compared with the traditional wet dust removal, the blast furnace gas dry dust removal technology has the advantages of water saving, high dust removal efficiency, full utilization of sensible heat of gas, high residual pressure generated energy of gas and the like, and becomes an advanced technology for promoting energy conservation and emission reduction and development of circular economy in the steel industry by matching with the residual pressure waste heat power generation technology. Compared with the traditional wet dust removal method, the blast furnace gas dry dust removal method can save 35% of investment, 7-9 t of circulating water, 60-70% of electricity, 30% of newly increased electricity generation and greatly reduce the discharge of sewage and sludge every year. However, the blast furnace gas after dry dedusting can cause serious corrosion of gas pipelines, blades of a residual pressure turbine power generation device (TRT) and other accessory equipment, thereby causing the vibration of the TRT blades, gas leakage, reduction of the heat storage efficiency of checker bricks of the hot blast stove and the like, seriously influencing the normal operation of the residual pressure waste heat recovery device and the normal smelting of the blast furnace and bringing about great potential safety production hazards. The reason for causing corrosion is that acidic corrosive components in blast furnace gas after dry dedusting cannot be taken away by liquid like wet dedusting and remain in the gas, and further form an acidic liquid environment with condensed water separated out due to the reduction of the temperature of the gas, so that the surface of equipment is corroded.
The corrosion prevention of the blast furnace gas subjected to dry dedusting is divided into a passive type and an active type. The passive corrosion prevention is to adopt corrosion-resistant materials, corrosion-resistant coatings and the like to strengthen the corrosion resistance of metal parts. This can only partially and to some extent alleviate the effects of corrosion and does not solve the problem fundamentally. Active anticorrosion, such as changing raw fuel components, wet spraying deacidification, dry deacidification and the like, aims to reduce the content of acid components in the coal gas. The raw material with less sulfur and chlorine elements is selected for smelting, which is an effective anticorrosion method, but the measure is limited by the conditions such as ore grade, raw material supply and the like, and the selectable scope is not large. The reduction of the introduction of acidic components in each smelting process has obvious corrosion treatment effect, for example, chlorine-containing auxiliaries are not used in a sintering process, the use of wastewater in the processes of desulfurization, coking and the like in each process is controlled, the acidic components in coal gas can be effectively reduced, but the treatment load and the environmental protection investment of the production wastewater which cannot be recycled are greatly increased. The wet alkali liquor spraying washing has a good removal effect on acid components in the coal gas, however, the alkali liquor is corrosive and can cause scaling and blockage, and in addition, the wet deacidification counteracts the advantages of water saving of dry dedusting, utilization of sensible heat of the coal gas and the like to a great extent. The dry deacidification is a method for removing acid components in blast furnace gas by using a solid alkaline deacidification agent through reaction, takes the advantages of a dry dedusting process, and gradually becomes a trend explored by a blast furnace gas deep purification technology.
The main component of blast furnace top gas comprises N 2 、CO、CO 2 、H 2 And C m H n And other components are as follows: COS and H 2 S、NO x And HCl, etc., and further contains a certain amount of furnace dust and water vapor. According to research, strong acid components containing Cl, S and the like in blast furnace gas are the main causes of corrosion problems. The HCl and H mainly exist in the form of gas in the blast furnace gas and contain strong acidic components such as Cl and S 2 S、COS、CS 2 In which HCl, H 2 S is inorganic acid, conventional alkaline active component can be removed, and COS and CS 2 As organic sulfur, alkaline absorption cannot be directly utilized, and a catalyst is needed for hydrolyzing and converting the organic sulfur into H 2 And removing the S. At present, the industrial application of the method for the desulfurization and dechlorination of the blast furnace gas mostly adopts step-by-step dechlorination, organic sulfur hydrolysis and inorganic sulfur removal, thereby greatly increasing the investment for the deacidification of the blast furnace gas and occupying a large amount of industrial land.
Therefore, those skilled in the art are working on developing a system and a method for simultaneously desulfurizing and dechlorinating blast furnace gas by a dry method for steel enterprises.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention provides a system and a method for simultaneous dry desulfurization and dechlorination of blast furnace gas.
In order to realize the aim, the invention firstly provides a blast furnace gas dry-method simultaneous desulfurization and dechlorination system, which comprises a dedusted blast furnace clean gas supply subsystem, a cooperative desulfurization and dechlorination tower subsystem and a cooperative deacidification agent replacement subsystem; the system is connected behind the gas input pipeline, a cooperative deacidification agent bed layer is arranged in the middle of the cooperative desulfurization and dechlorination tower, and a cooperative deacidification agent bed layer is filled in the cooperative deacidification agent bed layer; the joint of the upper end of the cooperative desulfurization and dechlorination tower and a coal gas input pipeline is in flange connection, and a tower cover of the upper half part of the cooperative desulfurization and dechlorination tower is in flange connection with a tower body; the joint of the lower end of the cooperative desulfurization and dechlorination tower and a coal gas output pipeline is in flange connection, and the bottom of the lower half part of the cooperative desulfurization and dechlorination tower is in flange connection with the tower body; the cooperative deacidification agent replacing subsystem comprises flange connections, and replacement is carried out through detachable flange connections after the cooperative deacidification agent fails; the synergistic deacidification agent takes activated alumina as a carrier material and adopts an isometric impregnation method to load Na 2 CO 3 And (4) preparing.
Further, the synergistic deacidification agent is prepared by the following method: roasting the dried activated alumina carrier at 550 ℃ for 3h, and then naturally cooling; adding Na containing carrier 15 wt% 2 CO 3 Completely dissolving the active alumina in water, wherein the volume of the solution is equal to that of the active alumina, loading the active alumina on the solution by an isometric impregnation method, and the impregnation time is 24 hours, so that the carrier material can fully absorb the active components; drying the impregnated synergistic deacidification agent at 105 deg.C for 5 hr to dry, and allowing Na to pass through 2 CO 3 The active alumina is uniformly loaded on the surface of the active alumina; and finally roasting and activating the dried synergistic deacidification agent at 350 ℃ for 3h, and naturally cooling.
Furthermore, a by-pass pipeline leading to the gas input pipeline is arranged on the gas output pipeline, a one-way return valve and a booster fan are arranged on the by-pass pipeline, a gas pressure detection device is arranged above the bed layer of the reaction tower, and an atmosphere communication valve used for purging residual gas in the reaction tower is also arranged.
Secondly, the invention firstly provides a dry method simultaneous desulfurization and dechlorination method for blast furnace gas, which comprises the following steps: the blast furnace clean gas discharged from the bag-type dust remover enters a synergic desulfurization and dechlorination tower through a gas input pipeline, and HCl and H in the gas pass through a synergic deacidification agent bed layer 2 Na in S-quilt synergistic deacidification agent 2 CO 3 Absorbing and removing COS and CS in the gas 2 Is catalyzed and hydrolyzed into H by a synergistic deacidification agent 2 S is then Na 2 CO 3 Absorbing and removing HCl and H in the gas 2 S、COS、CS 2 Then enters a TRT and a pressure reducing valve bank through a gas output pipeline; the joint of the upper end of the cooperative desulfurization and dechlorination tower and a coal gas input pipeline is in flange connection, and a tower cover of the upper half part of the cooperative desulfurization and dechlorination tower is in flange connection with a tower body; the joint of the lower end of the synergistic desulfurization and dechlorination tower and a coal gas output pipeline is in flange connection, and the bottom of the lower half part of the synergistic desulfurization and dechlorination tower is in flange connection with the tower body; the synergistic deacidification agent takes activated alumina as a carrier material and adopts an isometric impregnation method to load Na 2 CO 3 Preparing; and after the synergistic deacidification agent in the synergistic desulfurization and dechlorination tower fails, disassembling the flange connection, emptying the failed synergistic deacidification agent in the synergistic desulfurization and dechlorination tower, and filling a new synergistic deacidification agent.
Further, the synergistic deacidification agent is prepared by the following method: roasting the dried activated alumina carrier at 550 ℃ for 3h, and then naturally cooling; adding Na containing carrier 15 wt% 2 CO 3 Completely dissolving the active alumina in water, wherein the volume of the solution is equal to that of the active alumina, loading the active alumina on the solution by an isometric impregnation method, and the impregnation time is 24 hours, so that the carrier material can fully absorb the active components; drying the impregnated synergistic deacidification agent at 105 deg.C for 5 hr to dry, and allowing Na to pass through 2 CO 3 Uniformly loaded on the surface of the activated aluminaKneading; and finally roasting and activating the dried synergistic deacidification agent at 350 ℃ for 3h, and naturally cooling.
Further, the method also comprises the following steps: and adjusting the opening degree of a one-way backflow valve on a bypass pipeline connecting the gas inlet pipeline and the gas outlet pipeline and the rotating speed of the booster fan to enable part of the gas in the gas outlet pipeline to flow back to the gas inlet pipeline and be mixed with the gas in the gas inlet pipeline so as to obtain the required reactant concentration and pressure.
And further, an atmospheric communication valve for purging residual gas in the reaction tower is further arranged, and when the cooperative deacidification agent is replaced, the one-way return valve is closed, the atmospheric communication valve is opened, and the booster fan is started to purge the residual gas before the flange is detached.
The invention only adopts one step to remove HCl and H in blast furnace gas 2 Removal of S inorganic acid, COS and CS 2 The hydrolysis conversion involves and is completely removed, and the defect that the traditional industry can only remove HCl or sulfur-containing components in blast furnace gas by a step-by-step process is overcome. Compared with the traditional process for removing HCl or sulfur-containing components in blast furnace gas step by step, the invention saves a large amount of investment for constructing deacidification system equipment, saves complicated process, saves industrial land, and cooperates with activated alumina and Na used by deacidification agent 2 CO 3 The material is cheap and common, and the cost is saved.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a schematic diagram of a system for simultaneous dry desulfurization and dechlorination of blast furnace gas in a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of a dry simultaneous desulfurization and dechlorination system for blast furnace gas in a further embodiment of the present invention;
Detailed Description
The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.
The blast furnace gas dry method simultaneous desulfurization and dechlorination system according to the invention is shown in figure 1.
The system device comprises a dust-removed blast furnace clean gas supply subsystem, a cooperative desulfurization and dechlorination tower subsystem and a cooperative deacidification agent replacing subsystem; wherein
The dust-removed blast furnace clean gas supply subsystem comprises: clean gas generated by raw gas generated at the top of the blast furnace after passing through a gravity dust collector and a bag-type dust collector enters a cooperative desulfurization and dechlorination tower 2 through a gas pipeline 1.
The deacidification subsystem of the synergetic desulfurization and dechlorination tower comprises: the subsystem is connected behind a gas pipeline 1, a synergistic deacidification agent bed layer 2a is arranged in the middle of the synergistic desulfurization and dechlorination tower, and a synergistic deacidification agent is filled in the synergistic deacidification agent bed layer; the joint of the upper end of the cooperative desulfurization and dechlorination tower and the pipeline 1 is in flange connection 2b, and the tower cover of the upper half part of the cooperative desulfurization and dechlorination tower is in flange connection 2c with the tower body; the joint of the lower end of the collaborative desulfurization and dechlorination tower and the pipeline 3 is in flange connection 2e, and the tower bottom of the lower half part of the collaborative desulfurization and dechlorination tower is in flange connection 2d with the tower body.
A synergistic deacidification agent replacement subsystem: the subsystem comprises flange connections at four positions 2b, 2c, 2d and 2e, and the cooperative deacidification agent in the subsystem 2a is replaced through detachable flange connections after failure.
The method for simultaneously desulfurizing, dechlorinating and deacidifying the blast furnace gas comprises the following steps:
the blast furnace clean gas at 150 ℃ discharged from the bag-type dust remover enters a synergic desulfurization and dechlorination tower 2 through a gas pipeline 1, and HCl and H in the gas pass through a synergic deacidification agent bed layer 2a 2 Na in S-quilt synergistic deacidification agent 2 CO 3 Absorbing and removing COS and CS in the gas 2 Is catalyzed and hydrolyzed into H by a synergistic deacidification agent 2 S is then Na 2 CO 3 Absorbing and removing HCl and H in the gas 2 S、COS、CS 2 Then enters a TRT and pressure reducing valve group through a pipeline 3;
after the cooperative deacidification agent in the cooperative desulfurization and dechlorination tower 2 is failed, the failed cooperative deacidification agent in the cooperative desulfurization and dechlorination tower 2 is emptied through 2d and 2e flange connection and is loaded into a new cooperative deacidification agent through 2b and 2c flange connection and disassembly.
Wherein the synergistic deacidification agent is prepared by the following method:
active alumina is taken as a carrier material, and an isovolumetric impregnation method is adopted to load Na 2 CO 3 Preparation of the resulting synergistic deacidification agent, Na 2 CO 3 Can be used as an alkaline active component to absorb and remove HCl and H 2 S, or forming alkaline center on the surface of active alumina to catalyze and hydrolyze COS and CS 2 . The preparation method comprises the following steps:
roasting the dried activated alumina carrier at 550 ℃ for 3h, and then naturally cooling; adding Na containing carrier 15 wt% 2 CO 3 Completely dissolving the active alumina in water, wherein the volume of the solution is equal to that of the active alumina, loading the active alumina on the solution by an isometric impregnation method, and the impregnation time is 24 hours, so that the carrier material can fully absorb the active components; drying the impregnated synergistic deacidification agent at 105 deg.C for 5 hr to dry, and allowing Na to pass through 2 CO 3 The active alumina is uniformly loaded on the surface of the active alumina; and finally roasting and activating the dried synergistic deacidification agent at 350 ℃ for 3h, and naturally cooling.
The synergistic deacidification agent prepared by the method is used for simulating HCl and H in blast furnace gas under laboratory conditions 2 S, COS and CS 2 The removal (hydrolysis) effect of (a) is shown in the following table:
therefore, it has been proved through experiments that this synergistic deacidification agent has the function of simultaneous desulfurization and dechlorination, wherein
By using Na in a synergistic deacidification agent 2 CO 3 The basic principle of absorbing and removing the HCl of the blast furnace gas is as follows:
the principle that the purified gas obtained after the blast furnace gas is subjected to gravity dust removal and cloth bag dust removal enters a synergistic desulfurization and dechlorination tower to remove HCl in the gas is that Na is contained in a synergistic deacidification agent arranged on a fixed bed layer of the synergistic desulfurization and dechlorination tower 2 CO 3 Absorbing HCl in the coal gas to achieveDechlorination of blast furnace gas. The chemical reaction equation generated in the dechlorination process is as follows:
Na 2 CO 3 +2HCl (g) ——→2NaCl+H 2 O (g) +CO 2(g) (1)
by using Na in a synergistic deacidification agent 2 CO 3 Absorbing and removing blast furnace gas H 2 The basic principle of S is as follows:
the purified gas obtained after the blast furnace gas is subjected to gravity dust removal and cloth bag dust removal enters a cooperative desulfurization and dechlorination tower to remove H in the gas 2 The principle of S is that Na is contained in a synergistic deacidification agent arranged on a fixed bed layer of a synergistic desulfurization and dechlorination tower 2 CO 3 Absorbing H in coal gas 2 S to remove H from blast furnace gas 2 And (5) S acting. The chemical reaction equation that takes place during the stripping process is as follows:
Na 2 CO 3 +H 2 S (g) ——→Na 2 S+H 2 O (g) +CO 2(g) (2)
the basic principle of hydrolyzing the COS of the blast furnace gas by using the synergistic deacidification agent as a catalyst is as follows:
the principle that clean gas obtained by the gravity dust removal and the cloth bag dust removal of blast furnace gas enters the COS of the hydrolyzed gas of the cooperative desulfurization and dechlorination tower is that Na is contained in a cooperative deacidification agent arranged on a fixed bed layer of the cooperative desulfurization and dechlorination tower 2 CO 3 The basic center can be formed on the surface to act as an organic sulfur hydrolysis catalyst, so that the COS hydrolysis effect of the blast furnace gas is achieved. The chemical reaction equation that occurs during hydrolysis is as follows:
COS (g) +H 2 O (g) ——→H 2 S (g) +CO 2(g) (3)
method for hydrolyzing blast furnace gas CS by using synergistic deacidification agent as catalyst 2 The basic principle of the method is as follows:
the clean gas of the blast furnace gas after gravity dust removal and cloth bag dust removal enters a collaborative desulfurization dechlorination tower to hydrolyze CS in the gas 2 The principle is that Na is contained in a synergistic deacidification agent arranged on a fixed bed layer of a synergistic desulfurization and dechlorination tower 2 CO 3 Can form alkaline centers on the surfaceThe function of the organic sulfur hydrolysis catalyst is used for achieving the CS of the blast furnace gas hydrolysis 2 And (4) acting. The chemical reaction equation that occurs during hydrolysis is as follows:
CS 2(g) +2H 2 O (g) ——→2H 2 S (g) +CO 2(g) (5)
in order to optimize the reaction process and increase the reaction efficiency, it is desirable to control and regulate the concentration and pressure of the gaseous reactants according to the reaction kinetics, especially after passing through the reaction column, where the gas pressure loss is large. Therefore, as shown in fig. 2, in another embodiment according to the present invention, a by-pass pipe 4 leading to the gas input pipe 1 is provided on the gas output pipe 3, a one-way return valve 5 and a booster fan 6 are provided on the by-pass pipe 4, and a gas pressure detecting device P is provided above the bed layer of the reaction tower. By controlling the opening of the one-way return valve 11 and the rotating speed of the booster fan 16, the reacted gas in the gas output pipeline 3 partially circulates and flows back, and is mixed with the input clean gas to prepare, so that the pressure of the clean gas entering the deacidification system and the concentration of reaction components can be adjusted, and meanwhile, the deacidification system is equivalent to multi-stage circulating deacidification. In addition, when the synergistic deacidification agent needs to be replaced, before the flange is disassembled, the one-way return valve 5 is closed, the atmosphere communicating valves 7 and 8 are opened, and the booster fan 6 is started to purge the reaction tower so as to remove residual coal gas, so that the safety of operators is ensured.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (5)
1. A blast furnace gas dry method simultaneous desulfurization and dechlorination system is characterized by comprising a dedusted blast furnace clean gas supply subsystem, a cooperative desulfurization and dechlorination tower subsystem and a cooperative deacidification agent replacement subsystem; wherein the height after dust removal is highThe furnace clean gas supply subsystem sends clean gas generated by raw gas generated at the top of the blast furnace after passing through a gravity dust collector and a bag-type dust collector into the deacidification subsystem of the cooperative desulfurization and dechlorination tower through a gas input pipeline, the subsystem is connected behind the gas input pipeline, a cooperative deacidification agent bed layer is arranged in the middle of the cooperative desulfurization and dechlorination tower, and a cooperative deacidification agent is filled in the cooperative deacidification agent bed layer; the joint of the upper end of the cooperative desulfurization and dechlorination tower and a coal gas input pipeline is in flange connection, and a tower cover of the upper half part of the cooperative desulfurization and dechlorination tower is in flange connection with a tower body; the joint of the lower end of the cooperative desulfurization and dechlorination tower and a coal gas output pipeline is in flange connection, and the bottom of the lower half part of the cooperative desulfurization and dechlorination tower is in flange connection with the tower body; the cooperative deacidification agent replacing subsystem comprises flange connections, and replacement is carried out through detachable flange connections after the cooperative deacidification agent fails; the synergistic deacidification agent takes activated alumina as a carrier material and adopts an isometric impregnation method to load Na 2 CO 3 Preparing; wherein the synergistic deacidification agent is prepared by the following method: roasting the dried activated alumina carrier at 550 ℃ for 3h, and then naturally cooling; adding Na containing carrier 15 wt% 2 CO 3 Completely dissolving the active alumina in water, wherein the volume of the solution is equal to that of the active alumina, loading the active alumina on the solution by an isometric impregnation method, and the impregnation time is 24 hours, so that the carrier material can fully absorb the active components; drying the impregnated synergistic deacidification agent at 105 deg.C for 5 hr to dry, and allowing Na to pass through 2 CO 3 The active alumina is uniformly loaded on the surface of the active alumina; and finally roasting and activating the dried synergistic deacidification agent at 350 ℃ for 3h, and naturally cooling.
2. The system of claim 1, wherein a bypass line leading to the gas input line is provided on the gas output line, a one-way return valve and a booster fan are provided on the bypass line, a gas pressure detecting device is provided above the reaction tower bed, and an atmospheric communicating valve for purging residual gas in the reaction tower is further provided.
3. A dry method for desulfurizing and dechlorinating blast furnace gas simultaneously features thatCharacterized by comprising the following steps: the blast furnace clean gas discharged from the bag-type dust remover enters a synergic desulfurization and dechlorination tower through a gas input pipeline, and HCl and H in the gas pass through a synergic deacidification agent bed layer 2 Na in S-quilt synergistic deacidification agent 2 CO 3 Absorbing and removing COS and CS in the gas 2 Is catalyzed and hydrolyzed into H by a synergistic deacidification agent 2 S is then Na 2 CO 3 Absorbing and removing HCl and H in the gas 2 S、COS、CS 2 Then enters a TRT and a pressure reducing valve bank through a gas output pipeline; the joint of the upper end of the cooperative desulfurization and dechlorination tower and a coal gas input pipeline is in flange connection, and a tower cover of the upper half part of the cooperative desulfurization and dechlorination tower is in flange connection with a tower body; the joint of the lower end of the cooperative desulfurization and dechlorination tower and a coal gas output pipeline is in flange connection, and the bottom of the lower half part of the cooperative desulfurization and dechlorination tower is in flange connection with the tower body; the synergistic deacidification agent takes activated alumina as a carrier material and adopts an isometric impregnation method to load Na 2 CO 3 Preparing; after the cooperative deacidification agent in the cooperative desulfurization and dechlorination tower fails, disassembling the flange connection, emptying the failed cooperative deacidification agent in the cooperative desulfurization and dechlorination tower, and filling a new cooperative deacidification agent; wherein the synergistic deacidification agent is prepared by the following method: roasting the dried activated alumina carrier at 550 ℃ for 3h, and then naturally cooling; adding Na containing carrier 15 wt% 2 CO 3 Completely dissolving the active alumina in water, wherein the volume of the solution is equal to that of the active alumina, loading the active alumina on the solution by an isometric impregnation method, and the impregnation time is 24 hours, so that the carrier material can fully absorb the active components; drying the impregnated deacidification agent at 105 deg.C for 5 hr to dry, and allowing Na to pass through 2 CO 3 The active alumina is uniformly loaded on the surface of the active alumina; and finally roasting and activating the dried synergistic deacidification agent at 350 ℃ for 3h, and naturally cooling.
4. The dry simultaneous desulfurization and dechlorination method of blast furnace gas according to claim 3, further comprising the steps of: and adjusting the opening degree of a one-way backflow valve on a bypass pipeline connecting the gas inlet pipeline and the gas outlet pipeline and the rotating speed of the booster fan to enable part of the gas in the gas outlet pipeline to flow back to the gas inlet pipeline and be mixed with the gas in the gas inlet pipeline so as to obtain the required reactant concentration and pressure.
5. The dry simultaneous desulfurization and dechlorination method for blast furnace gas according to claim 4, wherein an atmospheric communication valve for purging residual gas in the reaction tower is further provided, and when the cooperative deacidification agent is replaced, the one-way return valve is closed and the atmospheric communication valve is opened before the flange is detached, and the booster fan is started to purge the residual gas.
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