CN114106892A - Blast furnace gas low-temperature dry-method fine desulfurization system and method - Google Patents
Blast furnace gas low-temperature dry-method fine desulfurization system and method Download PDFInfo
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- CN114106892A CN114106892A CN202111588459.4A CN202111588459A CN114106892A CN 114106892 A CN114106892 A CN 114106892A CN 202111588459 A CN202111588459 A CN 202111588459A CN 114106892 A CN114106892 A CN 114106892A
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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
- C10K1/34—Purifying combustible gases containing carbon monoxide by catalytic conversion of impurities to more readily removable materials
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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
- C10K1/004—Sulfur containing contaminants, e.g. hydrogen sulfide
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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
- C10K1/02—Dust removal
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Abstract
The invention discloses a blast furnace gas low-temperature dry-method fine desulfurization system and a method, belonging to the technical field of blast furnace gas fine desulfurization.
Description
Technical Field
The invention belongs to the technical field of blast furnace gas fine desulfurization, and particularly relates to a low-temperature dry-method fine desulfurization system and method for blast furnace gas.
Background
Blast furnace iron making is a main method of modern iron making and is an important link of steel production. The blast furnace generates a large amount of blast furnace gas in the smelting process, and the blast furnace gas mainly comprises 6-12% of carbon dioxide, 0.2-0.5% of methane, 28-33% of carbon monoxide, 1-4% of hydrogen, 55-60% of nitrogen and 780-980 Kcal/Nm of heat value3(ii) a H before desulfurization2S content 20-70mg/Nm3COS content of 60-150mg/Nm3。
Blast furnace gas is used as a secondary energy source in the iron-making process and has the most extensive application in iron and steel enterprises. The blast furnace gas is directly used as fuel for hot blast stove, coke oven, sintering, pelletizing, lime kiln, steel rolling, heating furnace, blast furnace gas power generation and other facilities. There are two forms of sulfur in blast furnace gas: organic sulfur (COS, CS)2Etc.) and inorganic sulfur (H)2S), the sulfides in the two forms can be converted into SO after combustion2And SO3Acid rain is formed, which causes environmental pollution, and the emission of the facilities cannot reach the national emission standard. Before blast furnace gas fine desulfurization is not available, the facilities are generally respectively provided with the tail end desulfurization devices to reach the national emission standard, and the blast furnace gas users are distributed very dispersedly, so that the problems of large investment, large occupied area, high construction difficulty, high operation cost and the like are caused by the adoption of the tail end desulfurization devices. Therefore, the method of fine desulfurization using the blast furnace gas source is the best method for solving the above problems.
In order to solve the problems existing in the treatment of the tail end desulfurization device, the existing blast furnace gas fine desulfurization method mainly comprises a wet method and a dry method:
as in the Chinese patent: CN110643395A 'a blast furnace gas fine desulfurization process', the patent describes a process route as follows: blast furnace gas dust removal system → organic sulfur hydrolysis and conversion → residual pressure power generation → wet alkali washing tower → gas pipe network. The process has the following defects: (1) organic sulfur hydrolytic conversion is arranged before the residual pressure power generation, wet desulphurization is arranged after the residual pressure power generation, and H in coal gas is hydrolyzed and converted2The S content will increase, which will aggravate the corrosion or salt deposition of the residual pressure power generation facility and the auxiliary pipelines thereof; (2) after the wet alkali washing tower is adopted, the water content in the blast furnace gas can be increased, and the heat value of the blast furnace gas is reduced; (3) the system is complex, the occupied area is large, the energy consumption is high, and the operation cost is high.
As in the Chinese patent: CN110387270A 'blast furnace gas dry desulfurization system and method', the medium temperature fine desulfurization method is adopted, the process route described in the patent is as follows: blast furnace → coarse dust collector of dry method → prepositive powder desulphurization device → fine dust collector of dry method → organic sulfur conversion tower → second stage dry method desulphurization device → powder collector → TRT residual pressure power generation. The process has the following defects: (1) the process has two-stage desulfurization, three-stage dust removal, complex system, more equipment and more investment. (2) The adaptability of the desulfurization device of the process needs to be verified, and the main problems at present are as follows: desulfurization catalyst products having desulfurization temperatures greater than 100 ℃ and desulfurization temperatures exceeding 100 ℃ are under study.
The blast furnace gas dry desulphurization method adopts the following process route: blast furnace gas dust removal system → TRT residual pressure power generation → microcrystal adsorption desulfurization → gas pipe network. The method mainly has the defects of large investment, high energy consumption and the like.
Disclosure of Invention
The invention aims to provide a blast furnace gas low-temperature dry-method fine desulfurization system and a blast furnace gas low-temperature dry-method fine desulfurization method, which solve the technical problems of high investment, high energy consumption and the like of the blast furnace gas dry-method desulfurization method in the prior art.
The invention discloses a blast furnace gas low-temperature dry-method fine desulfurization system which comprises a first heat exchanger, wherein an inlet of the first heat exchanger is connected with an outlet of a second heat exchanger, an inlet of the second heat exchanger is connected with a TRT (blast furnace top gas recovery turbine), an outlet of the first heat exchanger is connected with a fine dust removal and hydrolysis integrated tower, an outlet of the fine dust removal and hydrolysis integrated tower is connected with a heat exchange medium inlet of the second heat exchanger, a heat exchange medium outlet of the second heat exchanger is connected with a cooler inlet, an outlet of the cooler is connected with an inlet of a desulfurization tower, and an outlet of the desulfurization tower is connected with a gas pipe network.
The working principle is as follows:
when the TRT discharges blast furnace gas with the temperature of 30-50 ℃, the blast furnace gas enters a second heat exchanger to exchange heat with blast furnace gas with the temperature of 70-90 ℃ at the outlet of the fine dust removal and hydrolysis integrated tower, the temperature of the blast furnace gas after heat exchange in the second heat exchanger is raised to 55-70 ℃, then the blast furnace gas enters a first heat exchanger to be heated, then the blast furnace gas enters the fine dust removal and hydrolysis integrated tower to be subjected to dust removal and hydrolysis, the temperature of the blast furnace gas discharged from the fine dust removal and hydrolysis integrated tower is reduced to 55-60 ℃ after heat exchange in the second heat exchanger, then the blast furnace gas enters a cooler to be cooled, the blast furnace gas is cooled to 35-45 ℃, the blast furnace gas with the temperature of 35-45 ℃ enters a desulfurization tower, and H is realized in the tower2And S is converted into simple substance S, and the simple substance S is adsorbed and removed, so that the aim of desulfurization is fulfilled. And sending the blast furnace gas at the outlet of the desulfurizing tower after the purification treatment into a gas pipe network. The outlet of the fine dedusting and hydrolyzing integrated tower is connected with the heat exchange medium inlet of the second heat exchanger, and the blast furnace gas at the temperature of 70-90 ℃ at the outlet of the fine dedusting and hydrolyzing integrated tower can be used as the heat exchange medium of the second heat exchanger, so that the energy consumption is reduced, and the temperature of the gas entering the cooler can be reduced. The first heat exchanger is arranged to heat blast furnace gas, the temperature of the blast furnace gas is raised to 70-90 ℃ from 55-70 ℃, and the temperature of the gas entering the fine dust removal and hydrolysis integrated tower is ensured to be 70-90 ℃. The fine dedusting and hydrolysis integrated tower can convert organic sulfur in the coal gas into hydrogen sulfide, and can further remove dust in the coal gas to ensure that the content of the dust in the coal gas is less than 5mg/Nm3Can ensure that the dust content after the combustion of downstream users (hot blast stove, heating furnace, gas furnace, etc.) is less than 5mg/m3The emission requirement is met, and dust removal equipment is not needed.
Further, the second heat exchanger is a GGH heat exchanger.
By arranging the GGH heat exchanger, when the temperature of blast furnace gas discharged by TRT is 30-45 ℃, the temperature of blast furnace gas entering the heat exchanger can be increased, and the consumption of low-pressure saturated steam or high-temperature hot water of the heat exchanger can be saved.
Further, the first heat exchanger is a spiral finned tube carbon steel heat exchanger.
Further, a first flow regulating valve is arranged on the first heat exchanger.
By arranging the first flow regulating valve, the temperature of the blast furnace gas entering the fine dust removal and hydrolysis integrated tower is controlled by regulating the flow of low-pressure saturated steam or the flow of high-temperature hot water according to the temperature change of the gas entering the first heat exchanger, so that the temperature of the gas entering the fine dust removal and hydrolysis integrated tower is kept at 70-90 ℃.
Further, a first temperature control device is arranged between the first heat exchanger and the fine dedusting and hydrolyzing integrated tower.
The temperature of the gas entering the fine dust removal and hydrolysis integrated tower can be monitored by arranging the first temperature control device, and the flow of the low-pressure saturated steam or the high-temperature hot water entering the heat exchanger through the first flow regulating valve is regulated according to the temperature fed back by the first temperature control device, so that the temperature of the blast furnace gas entering the fine dust removal and hydrolysis integrated tower is kept at 70-90 ℃.
Furthermore, a hydrolyzing agent and a dedusting agent are filled in the fine dedusting and hydrolyzing integrated tower.
The blast furnace gas is dedusted and then hydrolyzed in the 4-step fine dedusting and hydrolyzing integrated tower, and organic sulfur in the blast furnace gas is converted into hydrogen sulfide under the catalysis of a hydrolyzing agent.
Further, a desulfurizing agent is filled in the desulfurizing tower.
The hydrogen sulfide in the blast furnace gas is converted into elemental sulfur under the catalysis of a desulfurizing agent and is absorbed.
Further, the cooler is a nonmetal anti-static plate heat exchanger.
Further, a second flow regulator is arranged in front of the heat exchange medium inlet of the cooler.
And the second flow regulator is arranged to regulate the flow of the circulating water cooling water to control the temperature of the blast furnace gas entering the desulfurizing tower according to the temperature change of the gas.
Further, a second temperature control device is arranged between the cooler and the desulfurizing tower.
The temperature of the coal gas entering the desulfurizing tower can be monitored by arranging the second temperature control device, and the flow of the circulating water cooling water entering the cooler is adjusted according to the temperature fed back by the second temperature control device, so that the temperature of the blast furnace coal gas before entering the desulfurizing tower is kept at 35-45 ℃.
Furthermore, a heat exchange medium outlet of the cooler is connected with a cooling tower, and the cooling tower is a mechanical ventilation cooling tower.
Furthermore, a circulating water pump is arranged in front of the heat exchange medium inlet of the cooler and the medium inlet of the first heat exchanger, and the circulating water pump is a variable frequency water pump.
The total flow of circulating water is adjusted by adopting frequency conversion adjustment according to the change of the heat load, so that the electricity is saved.
A blast furnace gas low-temperature dry-method fine desulfurization method comprises the following steps:
s1, conveying blast furnace gas to a heat exchanger for heat exchange, and keeping the temperature of the blast furnace gas at 70-90 ℃;
s2, dedusting the blast furnace gas after heat exchange and then hydrolyzing;
and S3, cooling the hydrolyzed gas to 35-45 ℃, feeding the gas into a gas pipe network for desulfurization, and feeding the gas into a gas pipe network after desulfurization.
Further, the gas after hydrolysis is firstly introduced into a heat exchanger to serve as a heat exchange medium, and then is cooled.
Further, the hydrolysis agent used for hydrolysis is a low-temperature catalyst of an alumina substrate.
Organic sulfur conversion principle: COS + H2O＝H2S+CO2，CS2+2H2O＝2H2S+CO2The hydrolysis efficiency is more than or equal to 95 percent. The used aluminum-based base material hydrolytic agent becomes a cement raw material after being ground, thereby realizing the recycling.
Furthermore, the desulfurizer used for desulfurization is an activated carbon substrate attached catalyst.
The adaptive temperature range of the desulfurizer is 35-45 ℃, the desulfurizer is a low-temperature desulfurizer, and the sulfur capacity is up to 300 mg/g. The desulfurizer is attached to a catalyst to convert hydrogen sulfide into elemental sulfur, the active carbon adsorbs the converted elemental sulfur, and the principle of hydrogen sulfide removal is as follows: 2H2S+O2＝2S+2H2And O. The desulfurization efficiency is more than or equal to 98 percent, thereby achieving the aim of desulfurization.
The invention has the beneficial effects that:
1. the dry-process fine desulfurization system is characterized in that all equipment is arranged behind the TRT, compared with a container which is arranged before the TRT and has pressure greater than 0.1MPa and needs pressing force to design, manufacture and accept, the system pressure is less than 30KPa, the system belongs to a normal-pressure container, the investment cost is low, the gas leakage risk is low, and the TRT operation influence is small;
2. the temperature of the gas after TRT can be flexibly adapted to the whole range of 30-120 ℃;
3. the fine dedusting and hydrolyzing integrated tower is adopted to convert organic sulfur into hydrogen sulfide and further reduce the dust content of coal gas, so that the dust content after combustion of downstream users (a hot blast stove, a heating furnace, a gas furnace and the like) is less than 5mg/m3 to meet the emission requirement, and dedusting equipment is not needed;
4. the whole process adopts a dry method, no water enters a gas system, and the calorific value of the gas is not reduced;
5. the temperature of the coal gas in front of the desulfurizing tower is reduced to 35-45 ℃, water in the coal gas is separated out and is discharged through a drainer, the water content of the coal gas is reduced, and the heat value of the coal gas is improved;
6. the used hydrolytic agent and desulfurizer do not belong to hazardous waste, can be recycled, and realize closed-loop environmental protection.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic structural diagram of a blast furnace gas low-temperature dry-method fine desulfurization system of the invention.
In the above drawings, each symbol has the following meaning: 1-a first heat exchanger, 2-TRT, 3-a fine dedusting and hydrolysis integrated tower, 4-a cooler, 5-a desulfurizing tower, 6-a gas pipe network, 7-a second heat exchanger, 8-a first flow regulating valve, 9-a first temperature control device, 10-a second flow regulator, 11-a second temperature control device, 12-a cooling tower and 13-a circulating water pump.
Detailed Description
The present invention will be described in further detail with reference to the following examples and the accompanying drawings.
A blast furnace gas low-temperature dry-method fine desulfurization method comprises the following steps:
s1, conveying blast furnace gas to a heat exchanger for heat exchange, and keeping the temperature of the blast furnace gas at 70-90 ℃;
s2, dedusting the blast furnace gas after heat exchange, and then hydrolyzing, wherein a hydrolyzing agent used for hydrolysis is a low-temperature catalyst of an alumina substrate;
s3, introducing the hydrolyzed gas into a heat exchanger serving as a heat exchange medium, cooling to 35-45 ℃, delivering to a gas pipe network for desulfurization, and introducing the desulfurized gas into the gas pipe network, wherein a desulfurizing agent used for desulfurization is an activated carbon substrate attached catalyst.
Organic sulfur conversion principle: COS + H2O＝H2S+CO2，CS2+2H2O＝2H2S+CO2The hydrolysis efficiency is more than or equal to 95 percent. The used aluminum-based base material hydrolytic agent becomes a cement raw material after being ground, thereby realizing the recycling.
The adaptive temperature range of the desulfurizer is 35-45 ℃, the desulfurizer is a low-temperature desulfurizer, and the sulfur capacity is up to 300 mg/g. The desulfurizer is attached to a catalyst to convert hydrogen sulfide into elemental sulfur, the active carbon adsorbs the converted elemental sulfur, and the principle of hydrogen sulfide removal is as follows: 2H2S+O2＝2S+2H2And O. The desulfurization efficiency is more than or equal to 98 percent, thereby achieving the aim of desulfurization.
Example 1
The blast furnace gas low-temperature dry-method fine desulfurization system using the method has the specific structure shown in fig. 1, and comprises a first heat exchanger 1, wherein an inlet of the first heat exchanger 1 is connected with an outlet of a second heat exchanger 7, an inlet of the second heat exchanger 7 is connected with TRT2, an outlet of the first heat exchanger 1 is connected with a fine dedusting and hydrolyzing integrated tower 3, an outlet of the fine dedusting and hydrolyzing integrated tower 3 is connected with a heat exchange medium inlet of the second heat exchanger 7, a heat exchange medium outlet of the second heat exchanger 7 is connected with an inlet of a cooler 4, an outlet of the cooler 4 is connected with an inlet of a desulfurization tower 5, and an outlet of the desulfurization tower 5 is connected with a gas pipe network 6.
The working principle is as follows:
when blast furnace gas at 30-50 ℃ is discharged from TRT2, the blast furnace gas enters a second heat exchanger 7 to exchange heat with blast furnace gas at 70-90 ℃ at the outlet of a fine dust removal and hydrolysis integrated tower 3, the temperature of the blast furnace gas after heat exchange in the second heat exchanger 7 is raised to 55-70 ℃, then the blast furnace gas enters a first heat exchanger 1 to be heated, then the blast furnace gas enters the fine dust removal and hydrolysis integrated tower 3 to be subjected to dust removal and hydrolysis, the temperature of the blast furnace gas discharged from the fine dust removal and hydrolysis integrated tower 3 is reduced to 55-60 ℃ after heat exchange in the second heat exchanger 7, then the blast furnace gas enters a cooler 4 to be cooled, the blast furnace gas is cooled to 35-45 ℃, the blast furnace gas at 35-45 ℃ enters a desulfurizing tower 5, and H is realized in the tower2And S is converted into simple substance S, and the simple substance S is adsorbed and removed, so that the aim of desulfurization is fulfilled. The blast furnace gas at the outlet of the desulfurizing tower 5 after purification treatment is sent into a gas pipe network 6. By connecting the outlet of the fine dedusting and hydrolyzing integrated tower 3 with the heat exchange medium inlet of the second heat exchanger 7, the blast furnace gas at 70-90 ℃ at the outlet of the fine dedusting and hydrolyzing integrated tower 3 can be used as the heat exchange medium of the second heat exchanger 7, thereby reducing the energy consumption and reducing the temperature of the gas entering the cooler 4. The first heat exchanger 1 is arranged to heat blast furnace gas, the temperature of the blast furnace gas is raised to 70-90 ℃ from 55-70 ℃, and the temperature of the gas entering the fine dust removal and hydrolysis integrated tower 3 is ensured to be 70-90 ℃. The fine dedusting and hydrolysis integrated tower 3 can further remove dust in the coal gas besides converting organic sulfur in the coal gas into hydrogen sulfide, and ensures that the content of the dust in the coal gas is less than 5mg/Nm3Can ensure the powder burnt by downstream users (hot blast stove, heating furnace, gas furnace, etc.)The dust content is less than 5mg/m3The emission requirement is met, and dust removal equipment is not needed.
Example 2
In this embodiment as a preferred embodiment of the present invention, a specific structure is shown in fig. 1, which discloses the following improvement on the basis of embodiment 1, and the second heat exchanger 7 is a GGH heat exchanger.
By arranging the GGH heat exchanger, when the temperature of blast furnace gas discharged by TRT is 30-45 ℃, the temperature of blast furnace gas entering the heat exchanger can be increased, and the consumption of low-pressure saturated steam or high-temperature hot water of the heat exchanger can be saved.
Example 3
As a preferred embodiment of the present invention, the present embodiment is specifically configured as shown in fig. 1, and discloses the following improvement on the basis of embodiment 2, in which a first flow rate adjusting valve 8 is disposed on a first heat exchanger 1, a first temperature control device 9 is disposed between the first heat exchanger 1 and a fine dust removal and hydrolysis integrated tower 3, a hydrolytic agent and a dedusting agent are filled in the fine dust removal and hydrolysis integrated tower 3, a desulfurizing agent is filled in a desulfurizing tower 5, a second flow rate adjuster 10 is disposed in front of a heat exchange medium inlet of a cooler 4, a second temperature control device 11 is disposed between the cooler 4 and the desulfurizing tower 5, a heat exchange medium outlet of the cooler 4 is connected to a cooling tower 12, the cooling tower 12 is a mechanical ventilation cooling tower 12, a circulating water pump 13 is disposed in front of a heat exchange medium inlet of the cooler 4, and the circulating water pump 13 is a variable frequency water pump.
By arranging the first flow regulating valve 8, the flow of low-pressure saturated steam or the flow of high-temperature hot water is regulated according to the temperature change of the coal gas entering the first heat exchanger 1 to control the temperature of the blast furnace coal gas entering the fine dust removal and hydrolysis integrated tower 3, so that the temperature of the coal gas entering the fine dust removal and hydrolysis integrated tower 3 is kept at 70-90 ℃.
By arranging the first temperature control device 9, the temperature of the gas entering the fine dust removal and hydrolysis integrated tower 3 can be monitored, and the flow of the low-pressure saturated steam or the high-temperature hot water entering the heat exchanger through the first flow regulating valve 8 is regulated according to the temperature fed back by the first temperature control device 9, so that the temperature of the blast furnace gas entering the fine dust removal and hydrolysis integrated tower 3 is kept at 70-90 ℃. The second flow regulator 10 is arranged to regulate the flow of the circulating water cooling water to control the temperature of the blast furnace gas entering the desulfurizing tower 5 according to the temperature change of the gas.
By arranging the second temperature control device 11, the temperature of the coal gas entering the desulfurizing tower 5 can be monitored, and the flow of the circulating water cooling water entering the cooler 4 is adjusted according to the temperature fed back by the second temperature control device 11, so that the temperature of the blast furnace coal gas before entering the desulfurizing tower 5 is kept at 35-45 ℃.
Table 1 energy consumption comparison of example 3 with no GGH heat exchanger
As can be seen from Table 1, the invention can save the production cost of enterprises, reduce the energy consumption and promote the green development.
Claims (10)
1. The utility model provides a blast furnace gas low temperature dry process fine desulfurization system, includes first heat exchanger (1), its characterized in that, first heat exchanger (1) entry linkage has second heat exchanger (7) export, second heat exchanger (7) entry linkage has TRT (2), first heat exchanger (1) exit linkage has fine dust removal integrative tower (3) of hydrolysising, the export of integrative tower (3) of fine dust removal hydrolysis with the heat transfer medium entry linkage of second heat exchanger (7), the heat transfer medium exit linkage of second heat exchanger (7) has cooler (4) entry, cooler (4) exit linkage has desulfurizing tower (5) entry, desulfurizing tower (5) exit linkage gas pipe network (6).
2. The blast furnace gas low-temperature dry fine desulfurization system according to claim 1, characterized in that the second heat exchanger (7) is a GGH heat exchanger.
3. The blast furnace gas low-temperature dry fine desulfurization system according to claim 1, characterized in that the first heat exchanger (1) is provided with a first flow regulating valve (8).
4. The blast furnace gas low-temperature dry-method fine desulfurization system according to claim 1, characterized in that a first temperature control device (9) is arranged between the first heat exchanger (1) and the fine dedusting and hydrolyzing integrated tower (3).
5. The blast furnace gas low-temperature dry fine desulfurization system according to claim 1, characterized in that a second flow regulator (10) is arranged in front of the heat exchange medium inlet of the cooler (4).
6. The blast furnace gas low-temperature dry fine desulfurization system according to claim 1, characterized in that a second temperature control device (11) is arranged between the cooler (4) and the desulfurization tower (5).
7. The blast furnace gas low-temperature dry fine desulfurization system according to claim 6, characterized in that the outlet of the heat exchange medium of the cooler (4) is connected with a cooling tower (12), and the cooling tower (12) is a mechanical draft cooling tower.
8. The blast furnace gas low-temperature dry-method fine desulfurization method is characterized by comprising the following steps of:
s1, conveying blast furnace gas to a heat exchanger for heat exchange, and keeping the temperature of the blast furnace gas at 70-90 ℃;
s2, dedusting the blast furnace gas after heat exchange and then hydrolyzing;
and S3, cooling the hydrolyzed gas to 35-45 ℃, feeding the gas into a gas pipe network for desulfurization, and feeding the gas into a gas pipe network after desulfurization.
9. The blast furnace gas low-temperature dry-method fine desulfurization method according to claim 8, characterized in that the hydrolyzed gas is firstly introduced into a heat exchanger to serve as a heat exchange medium and then cooled.
10. The method for fine desulfurization of blast furnace gas by low temperature dry method according to claim 9, characterized in that the hydrolyzing agent used for hydrolysis is a low temperature catalyst of alumina substrate.
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| CN114854456A (en) * | 2022-04-26 | 2022-08-05 | 安徽威达环保科技股份有限公司 | Low-cost blast furnace gas desulfurization method and device thereof |
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| CN114854456A (en) * | 2022-04-26 | 2022-08-05 | 安徽威达环保科技股份有限公司 | Low-cost blast furnace gas desulfurization method and device thereof |
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