CN113122340B - Blast furnace gas purification method - Google Patents
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- CN113122340B CN113122340B CN202110424032.4A CN202110424032A CN113122340B CN 113122340 B CN113122340 B CN 113122340B CN 202110424032 A CN202110424032 A CN 202110424032A CN 113122340 B CN113122340 B CN 113122340B
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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
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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
- C10K1/024—Dust removal by filtration
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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
- C10K1/20—Purifying combustible gases containing carbon monoxide by treating with solids; Regenerating spent purifying masses
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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
- C10K1/32—Purifying combustible gases containing carbon monoxide with selectively adsorptive solids, e.g. active carbon
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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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Abstract
The invention discloses a blast furnace gas purification method, which belongs to the technical field of metallurgy. The invention has the advantages of clean purification, low sulfur discharge, difficult corrosion of pipelines, stable operation of the power generation device, small occupied area of the device, more water saving, good power saving, reliable operation, good energy recovery, low labor cost, convenient operation, easy fault treatment and the like.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to an ultra-simple gas purification method.
Background
Blast furnace gas is a byproduct of iron and steel enterprises in the iron making process, namely low-calorific-value combustible gas containing carbon monoxide, carbon dioxide, nitrogen and hydrogen. The blast furnace gas which is not purified contains a large amount of dust, the dust-containing gas can block a gas pipeline and a burner of a combustion device, and the gas unit can be abraded, so that the pressure loss is increased. Therefore, the dust removal treatment is carried out before the utilization, and the dust removal is divided into coarse dust removal and fine dust removal. In the process of blast furnace coal injection, bituminous coal or anthracite can be injected to different degrees, and during coal injection, sulfur element generates SO through high-temperature chemical reaction 2 ，SO 3 Etc.; the imported ore, especially the Austenite, contained a large amount of Cl - . Saturated vapor in the coal gas is gradually separated out along with the reduction of the temperature of the coal gas, chlorine and sulfur in the saturated vapor are dissolved in water, coal gas condensate water is easy to have stronger acidity and corrode a coal gas pipeline, and the safety operation of a blast furnace gas pipe network is influenced by serious people. The existence of chlorine and sulfide in blast furnace gas can corrode the blades of the gas turbine, and the service life of the gas turbine is shortened. Removing H from sulfide in coal gas 2 S, and organic sulfur, and after untreated combustion,the emission of sulfur dioxide in the flue gas exceeds the standard. Organic matter such as heavy oil contained in blast furnace gas also blocks the nozzle of the combustion engine. Therefore, the blast furnace gas needs to be purified before combustion and power generation, and dust, chloride, sulfide, heavy oil and the like carried in the gas are removed.
In the existing blast furnace gas purification process, the dust removal link is a dry dust removal process which replaces the traditional wet process. The corrosion problem of the gas pipeline after purification treatment is found to be very prominent in the dry dust removal operation. Most of chlorides and sulfides in the gas are removed by adopting a blast furnace gas alkali spraying method, the corrosion of a gas pipeline is reduced, but because a large amount of alkali spraying and water spraying are used for circular washing, the heat value of the gas is reduced, the utilization value of the gas is influenced, a large amount of water resources are consumed, and a large amount of high-salt and high-chlorine wastewater is generated and needs to be treated.
Document CN201710404777.8 discloses a blast furnace gas deacidification method, which comprises the following steps: set up blast furnace gas deacidification device on current blast furnace gas dry process dust pelletizing system's basis, blast furnace gas deacidification device includes: powder spray gun, jetting jar and air supply source, powder spray gun includes: spray irrigation through the gas pipeline and a nozzle arranged on the spray pipe; the nozzle is positioned in the gas pipeline; the injection tank is fixedly connected with the powder spray gun through a powder spray pipeline; the injection tank is provided with a vulcanization nozzle; the air supply source is connected with the fluidization nozzle through an organ; the spraying carrier enters the spraying tank through the fluidizing nozzle to fluidize lime powder in the spraying tank, the fluidized lime powder flows into the powder spraying gun through the powder spraying pipeline and finally flows into the gas pipeline, the strong water absorption of the lime powder absorbs partial water in the blast furnace gas, and the calcium hydroxide is generated and then is mixed with acid gas in the gas, such as HCl and SO 2 、SO 3 、H 2 S、CO 2 Etc. are subjected to chemical reaction to generate CaCl 2 、CaS、CaSO 3 、CaSO 4 、CaCO 3 And the substances are finally recovered to an ash storage bin, so that the content of the acid gas in the coal gas is reduced. The disadvantages are that the chemical reaction activity of the lime powder under the temperature condition is insufficient, and the capability of removing acid gas in blast furnace gas is limited.
The document CN201220070822.3 relates to a blast furnace gas dry dedusting and dechlorination compound device which comprises a power generation device and a pressure reducing valve bank which are connected in parallel behind a blast furnace through pipelines, wherein a particle bed deduster is connected in series in front of the power generation device and the pressure reducing valve bank, and the particle bed deduster contains dechlorination particles, desulfurization particles, deamination particles and moisture absorption particles. A coarse dust removal device is arranged in front of the particle bed dust remover, and a dry fine dust removal device is arranged behind the particle bed dust remover. And simultaneously removing chlorine, sulfur and ammonia in the blast furnace gas. However, these treatment devices have a very large running resistance and a complicated regeneration process, which is too costly. Is not suitable for the working condition of low heat value and large air quantity of the blast furnace.
The problem of desulfurizing blast furnace gas at the source has been very hot. Many new processes and new technologies are continuously emerging in the market. By way of analysis, it is clear that the origin of these so-called new processes, new technologies (both wet and dry) is mostly from the petrochemical and coking industries. Blast furnace gas has great differences in the characteristics, gas volume and economic value of the oil and gas to be treated by these industries. If the blast furnace gas purification still continues to be the old method, the resources are wasted and are not paid.
Disclosure of Invention
The invention aims to solve the technical problems that the chloride, sulfide, dust and heavy oil in blast furnace gas are not completely removed, so that gas pipelines and gas turbine blades are easy to corrode, and the emission of sulfur dioxide exceeds the standard.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a blast furnace gas purification method comprises the steps of enabling raw gas to enter a turbine system after pre-deacidification, coarse dust removal and fine dust removal, then carrying out organic sulfur hydrolysis and fine desulfurization to obtain deep purification, and then sending the deep purification to each blast furnace gas pipe network, wherein the pre-deacidification selects soda lime powder.
The technical scheme of the invention is further improved as follows: the organic sulfur hydrolysis catalyst adopts an aluminum-based microcrystalline material, and the fine desulfurization uses a modified molecular sieve desulfurization adsorbent.
The technical scheme of the invention is further improved as follows: the aluminum-based microcrystalline material and the modified molecular sieve desulfurization adsorbent are carrier-free powder with the particle size of more than 220 meshes.
The technical scheme of the invention is further improved as follows: the soda lime comprises the following components in percentage by weight: 70-85%, naOH:5-10%, KOH:1-3%, H 2 O：8-12%。
The technical scheme of the invention is further improved as follows: the particle size of the soda lime powder is more than 320 meshes.
The technical scheme of the invention is further improved as follows: the blast furnace gas purification system comprises a blast furnace, a coarse dust removal unit, a fine dust removal unit, a turbine system and a fine desulfurization system which are sequentially connected through pipelines, wherein the blast furnace gas is deeply purified by the fine desulfurization system and then is sent to each blast furnace gas pipe network;
the method is characterized in that a pre-desulfurization powder spraying device is arranged on a raw gas outlet pipeline of the blast furnace, the pre-desulfurization powder spraying device comprises a powder spraying tank, a spray gun, a powder spraying pipeline and a control system, soda lime powder is arranged in the powder spraying tank, a fluidization spray head is arranged on the powder spraying tank, the powder spraying tank is connected with the spray gun through the powder spraying pipeline, the spray gun is arranged in the raw gas outlet pipeline, and a spraying carrier enters the powder spraying tank through the fluidization spray head, fluidizes the soda lime powder, then enters the spray gun through the powder spraying pipeline, and finally sprays the soda lime powder into the raw gas outlet pipeline.
The technical scheme of the invention is further improved as follows: the fine desulfurization system comprises a desulfurization empty tower and a bag-type dust remover which are connected in sequence, organic sulfur is hydrolyzed in the desulfurization empty tower, and fine desulfurization is carried out in two steps in the desulfurization empty tower and the bag-type dust remover.
The technical scheme of the invention is further improved as follows: the desulfurizing empty tower is a steel empty tower, the flow rate of coal gas in the desulfurizing empty tower is 3.5-4.5 m/s, and the filtering gas speed of a bag-type dust remover is 0.70-0.75 m/s.
The technical scheme of the invention is further improved as follows: the coarse dust removal unit adopts at least one of a gravity dust remover, a cyclone dust remover, a bag-type dust remover, an electric dust remover or a ceramic high-temperature dust remover, and the fine dust removal unit adopts a bag-type dust remover.
The technical scheme of the invention is further improved as follows: the organic sulfur hydrolysis catalyst and the modified molecular sieve desulfurization adsorbent are recycled, when the sulfur capacities of the two agents are close to saturation, a part of the agents are discharged and enter a regeneration device, the regeneration device is a tubular microwave pyrolyzer, and the pyrolysis temperature range is 200-1000 ℃.
The technical scheme of the invention is further improved as follows: the aluminum-based microcrystalline material contains at least one element in elements in groups IA, IIA, VA, IB, IIB, IIIB, IVB, VB, VIB, VIIB or VIII in the periodic table of elements, and the IIA element is selected from at least one of magnesium and calcium; the group IB element is selected from at least one of copper and silver; the IIIB group element is selected from at least one of lanthanum, cerium and yttrium, and the VIII group element is selected from at least one of iron, cobalt and nickel.
The technical scheme of the invention is further improved as follows: the improved molecular sieve desulfurization adsorbent is selected from multiple or at least one of X-type molecular sieve, Y-type molecular sieve, A-type molecular sieve, ZSM-type molecular sieve, mordenite, beta-type zeolite, SAPO-type molecular sieve, ALPO-type molecular sieve, MCM-22 molecular sieve, MCM-49, MCM-56, SSZ-13 molecular sieve, ZSM-5/mordenite, ZSM-5/beta zeolite, ZSM-5/Y, MCM-22/mordenite, ZSM-5/Magadiite, ZSM-5/beta zeolite/mordenite, ZSM-5/beta zeolite/Y zeolite or ZSM-5/Y zeolite/mordenite, wherein the ZSM-type molecular sieve comprises at least one of ZSM-5, ZSM-23, ZSM-11 and ZSM-48, and the microcrystalline material silicon-aluminum molecular ratio of the ZSM-type molecular sieve is 100-10000.
Due to the adoption of the technical scheme, the invention has the technical progress that:
the invention carries out ultra-simple purification on the blast furnace gas through a series of process steps of pre-deacidification, coarse dust removal, fine dust removal, organic sulfur hydrolysis, fine desulfurization and the like, and has the advantages of clean purification, low sulfur emission, difficult corrosion of pipelines, stable operation of a power generation device, less occupied area of the device, more water saving, good electricity saving, reliable operation, good energy recovery, low labor cost, convenient operation, easy fault treatment and the like.
The invention selects the soda lime powder in the pre-deacidification stage, is different from the lime powder in the prior art, overcomes the defects of insufficient chemical reaction activity of the lime powder and limited removal capability of acid gas in blast furnace gas, and can effectively remove HCl and SO in the raw coke oven gas 2 、H 2 S and the like are far better than the lime powder alone in the effects of removing acid, water and carbon dioxide. Meanwhile, the component proportion of the soda lime is specifically limited, particularly the proportion of the water is controlled to be 8-12%, the soda lime is ensured to be used at present after being ground, the deacidification capability of the soda lime is further improved, and the subsequent poisoning failure of the organic sulfur hydrolysis catalyst is prevented.
Meanwhile, the particle size of the soda lime powder is preferably over 320 meshes, so that coarse dust removal in the subsequent stage is avoided, particularly, the soda lime powder is prevented from being removed when a gravity dust remover is used for coarse dust removal, the soda lime powder enters the fine dust removal unit after undergoing the coarse dust removal stage, and particularly, when the cloth bag dust remover is used for the fine dust removal unit, the soda lime powder is adsorbed by the cloth bag dust remover, so that the coal gas can be subjected to a deacidification process again in the fine dust removal stage, the soda lime powder is fully utilized, and the deacidification capacity of the coal gas is further improved.
The organic sulfur hydrolysis catalyst used in the invention is an aluminum-based microcrystalline material, the desulfurization adsorbent is a modified molecular sieve, and the two agents are carrier-free powder with the particle size of more than 220 meshes and can be used at normal temperature. The two kinds of chemical are first sprayed into desulfurizing empty tower with nitrogen or water vapor as carrier gas and the COS and CS in coal gas are then reacted in the desulfurizing empty tower 2 When organic sulfur gas is fully contacted with organic sulfur hydrolysis catalyst in the diffusion tower, it can be quickly decomposed into H 2 S and CO 2 . Then H 2 S is removed by a desulfurization adsorbent. Organic sulfur hydrolysis catalysis and fine desulfurization process unite two into one and all accomplish in desulfurization sky tower and sack cleaner, and whole desulfurization process can divide into two steps, is in the tower earlier, at last in the sack cleaner of rear-mounted, and the sack cleaner can play the effect of collecting, retrieving, and two kinds of medicaments that spread on the sack cleaner simultaneously can catalyze and adsorb before coal gas is discharged once more, further strengthen desulfurization further and catalyze two kinds of medicaments on the sack cleanerAnd (5) effect.
The organic sulfur hydrolysis catalyst and the desulfurization adsorbent of the process are recycled, and when the sulfur capacity of the agent is close to saturation, a part of the system is discharged and enters a regeneration device. The regeneration device of the process is a tubular microwave pyrolyzer with the power of 150Kw, and the pyrolysis temperature range is 200-1000 ℃; the waste gas generated by pyrolysis can be used for recovering sulfur in the waste gas and can also be absorbed and treated by lime water.
The content of hydrogen sulfide at the outlet of the clean gas is less than 10mg/m 3 The content of hydrogen chloride is less than 10mg/m 3 The oil content is 10mg/m 3 The dust content is less than 5mg/m 3 . Organic sulfur carried in the raw gas is also removed. Can ensure that the sulfur dioxide emission in the gas of the next gas pipe network user is 10mg/m 3 The following.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts;
FIG. 1 is a schematic view of a blast furnace gas purification process according to the present invention;
the device comprises a blast furnace 1, a coarse dust removal unit 2, a fine dust removal unit 3, a turbine system 4, a turbine system 5, a fine desulfurization system 6, a powder spraying tank 7 and a tubular microwave pyrolyzer.
Detailed Description
The present invention will be described in further detail with reference to the following examples:
as shown in fig. 1, the blast furnace gas purification system comprises a blast furnace 1, a coarse dust removal unit 2, a fine dust removal unit 3, a turbine system 4 and a fine desulfurization system 5 which are connected in sequence through pipelines, and the blast furnace gas is deeply purified by the fine desulfurization system and then sent to each blast furnace gas pipe network. The blast furnace gas purification method comprises the steps of pre-deacidifying raw gas, performing coarse dust removal and fine dust removal, then feeding the raw gas into a turbine system, performing organic sulfur hydrolysis and fine desulfurization to obtain deep purification, and then feeding the deep purification to each blast furnace gas pipe network. The blast furnace gas purification method has the advantages of clean purification, low sulfur emission, difficult corrosion of pipelines, stable operation of a power generation device, small occupied area of the device, more water saving, good electricity saving, reliable operation, good energy recovery, low labor cost, convenient operation, easy fault treatment and the like.
Preferably, the coarse dust removal unit 2 adopts at least one of a gravity dust remover, a cyclone dust remover, a bag-type dust remover, an electric dust remover or a ceramic high-temperature dust remover, and the fine dust removal unit adopts a bag-type dust remover.
The pre-deacidification is carried out at the outlet of the blast furnace 1, specifically, a pre-desulfurization powder spraying device is arranged on a blast furnace crude gas outlet pipeline and mainly comprises a powder spraying tank, a spray gun, a powder spraying pipeline and a control system, soda lime powder is arranged in the powder spraying tank 6, a fluidization spray nozzle is arranged on the powder spraying tank, the powder spraying tank is connected with the spray gun through the powder spraying pipeline, the spray gun is arranged in the crude gas outlet pipeline, and a blowing carrier enters the powder spraying tank through the fluidization spray nozzle, fluidizes the soda lime powder, then enters the spray gun through the powder spraying pipeline and finally sprays the soda lime powder into the crude gas outlet pipeline. The invention selects the soda lime powder in the pre-deacidification stage, is different from the lime powder in the prior art, has higher requirement on the reaction temperature, overcomes the defects of insufficient chemical reaction activity of the lime powder and limited removal capability of acid gas in blast furnace gas, can effectively remove HCl, SO2, H2S and the like in the raw coke oven gas at normal temperature, has better effects of removing acid, water and carbon dioxide than the single lime powder, and saves the reaction cost at lower temperature.
Wherein, the preferable soda lime comprises the following components in percentage by weight: 70-85%, naOH:5-10%, KOH:1-3%, H 2 O:8-12% and ensures the particle size of the soda lime powder to be above 320 meshes. Especially, the water content is controlled to be 8-12%, so that the soda lime is used as it is, the deacidification capability of the soda lime is further improved, and the poisoning failure of the subsequent organic sulfur hydrolysis catalyst is prevented.
The fine desulfurization stage is carried out in a fine desulfurization system 5, and the fine desulfurization system 5 comprises a desulfurization empty tower and a bag-type dust collector which are connected in sequenceThe organic sulfur hydrolysis is carried out in the desulfurizing empty tower, and the fine desulfurization is carried out in two steps in the desulfurizing empty tower and the bag-type dust remover. Specifically, two kinds of chemicals are sprayed into a desulfurization empty tower through a special nozzle, nitrogen or water vapor is generally used as carrier gas, and COS and CS in coal gas are contained in the desulfurization empty tower 2 When organic sulfur gas is fully contacted with organic sulfur hydrolysis catalyst in the diffusion tower, it can be quickly decomposed into H 2 S and CO 2 . Then H 2 S is removed by a desulfurization adsorbent. Wherein the desulfurization empty tower is a steel empty tower, the flow rate of coal gas in the desulfurization empty tower is 3.5-4.5 m/s, and the filtering gas speed of a bag-type dust remover is 0.70-0.75 m/s.
Wherein the organic sulfur hydrolysis catalyst is an aluminum-based microcrystalline material, and the fine desulfurization uses a modified molecular sieve desulfurization adsorbent. The aluminum-based microcrystalline material contains at least one element in elements in groups IA, IIA, VA, IB, IIB, IIIB, IVB, VB, VIB, VIIB or VIII in the periodic table of elements, and the IIA element is selected from at least one of magnesium and calcium; the group IB element is selected from at least one of copper and silver; the IIIB group element is selected from at least one of lanthanum, cerium and yttrium, and the VIII group element is selected from at least one of iron, cobalt and nickel. The improved molecular sieve desulfurization adsorbent is selected from multiple or at least one of X-type molecular sieve, Y-type molecular sieve, A-type molecular sieve, ZSM-type molecular sieve, mordenite, beta-type zeolite, SAPO-type molecular sieve, ALPO-type molecular sieve, MCM-22 molecular sieve, MCM-49, MCM-56, SSZ-13 molecular sieve, ZSM-5/mordenite, ZSM-5/beta zeolite, ZSM-5/Y, MCM-22/mordenite, ZSM-5/Magadiite, ZSM-5/beta zeolite/mordenite, ZSM-5/beta zeolite/Y zeolite or ZSM-5/Y zeolite/mordenite, the ZSM-type molecular sieve comprises at least one of ZSM-5, ZSM-23, ZSM-11 and ZSM-48, and the microcrystalline material of the ZSM-type molecular sieve has a silicon-aluminum molecular ratio of 100-10000. And the aluminum-based microcrystalline material and the modified molecular sieve desulfurization adsorbent are carrier-free powder with the particle size of more than 220 meshes.
Meanwhile, the organic sulfur hydrolysis catalyst and the modified molecular sieve desulfurization adsorbent are recycled, when the sulfur capacities of the two reagents are close to saturation, a part of the reagents are discharged and enter a regeneration device, the regeneration device is a tubular microwave pyrolyzer 7, and the pyrolysis temperature range is 200-1000 ℃, and is preferably 300-350 ℃.
The following description will be made with reference to a specific embodiment:
blast furnace gas from the blast furnace enters a coarse dust removal unit through pre-deacidification and then enters a fine dust removal unit. After coming out, the dust concentration is 10-20 mg/m 3 The concentration of the hydrogen chloride is between 20 and 50mg/m 3 The concentration of hydrogen sulfide is 0-50 mg/m 3 Organic sulfide content of 100-150 mg/m 3 Oil content of 10-50 mg/m 3 In the meantime. Then, the roughly purified coal gas enters a fine desulfurization device, namely a desulfurization empty tower and a bag-type dust collector system. The system contains a micro-powder organic sulfur hydrolysis catalyst and a desulfurization adsorbent which are diffused therein, and simultaneously removes hydrogen chloride and sulfide in the coal gas. At the moment, the chloride content of the clean gas is less than 5mg/m 3 The sulfide content is less than 5mg/m 3 The oil content is less than 5mg/m 3 The dust concentration is less than 5mg/m 3 (ii) a The pipeline and the blades of the combustion engine have no obvious corrosion phenomenon or nozzle blockage of the combustion engine, and the concentration of sulfur dioxide in the tail gas emission of the combustion engine is less than 10mg/m 3 。
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (2)
1. A blast furnace gas purification method, raw gas enters a turbine system after pre-deacidification, coarse dust removal and fine dust removal, then is deeply purified by organic sulfur hydrolysis and fine desulfurization and then is sent to each blast furnace gas pipe network, and is characterized in that: the pre-deacidification is carried out by selecting soda lime powder, wherein the soda lime comprises the following components in percentage by weight: 70-85%, naOH:5-10%, KOH:1-3%, H 2 O:8-12% of soda lime powder with the grain diameter of more than 320 meshes;
the blast furnace gas purification system comprises a blast furnace (1), a coarse dust removal unit (2), a fine dust removal unit (3), a turbine system (4) and a fine desulfurization system (5) which are sequentially connected through pipelines, wherein the blast furnace gas is deeply purified by the fine desulfurization system and then is sent to each blast furnace gas pipe network; the fine desulfurization system (5) comprises a desulfurization empty tower and a bag-type dust remover which are connected in sequence, organic sulfur hydrolysis is carried out in the desulfurization empty tower, and fine desulfurization is carried out in two steps in the desulfurization empty tower and the bag-type dust remover; the desulfurization empty tower is a steel empty tower, the flow rate of coal gas in the desulfurization empty tower is 3.5-4.5 m/s, the filtering gas speed of a bag-type dust remover is 0.70-0.75 m/s, the coarse dust removal unit (2) adopts a gravity dust remover, and the fine dust removal unit adopts a bag-type dust remover;
the organic sulfur hydrolysis catalyst adopts an aluminum-based microcrystalline material, and a modified molecular sieve desulfurization adsorbent is used for fine desulfurization; the aluminum-based microcrystalline material and the modified molecular sieve desulfurization adsorbent are carrier-free powder with the particle size of more than 220 meshes; the organic sulfur hydrolysis catalyst and the modified molecular sieve desulfurization adsorbent are recycled, when the sulfur capacities of the two agents are close to saturation, a part of the agents are discharged and enter a regeneration device, the regeneration device is a tubular microwave pyrolyzer (7), and the pyrolysis temperature range is 200-1000 ℃.
2. The blast furnace gas purification method according to claim 1, characterized in that: the method is characterized in that a pre-desulfurization powder spraying device is arranged on a raw gas outlet pipeline of the blast furnace (1), the pre-desulfurization powder spraying device comprises a powder spraying tank, a spray gun, a powder spraying pipeline and a control system, soda lime powder is arranged in the powder spraying tank, a fluidization spray head is arranged on the powder spraying tank (6), the powder spraying tank is connected with the spray gun through the powder spraying pipeline, the spray gun is arranged in the raw gas outlet pipeline, and a spraying carrier enters the powder spraying tank through the fluidization spray head, fluidizes the soda lime powder, then enters the spray gun through the powder spraying pipeline, and finally sprays the soda lime powder into the raw gas outlet pipeline.
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| CN113801704A (en) * | 2021-09-14 | 2021-12-17 | 武汉钢铁有限公司 | Low-pressure-loss type blast furnace gas continuous fluidization fine desulfurization system and method thereof |
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| CN116716131B (en) * | 2023-08-11 | 2023-11-14 | 浙江百能科技有限公司 | High-efficiency multiple removal system and method for raw gas |
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| CN107034330A (en) * | 2017-06-01 | 2017-08-11 | 首钢总公司 | A kind of blast furnace gas disacidifying device |
| CN111334339A (en) * | 2020-03-16 | 2020-06-26 | 山东洲蓝环保科技有限公司 | Fine desulfurization method for blast furnace gas |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107034330A (en) * | 2017-06-01 | 2017-08-11 | 首钢总公司 | A kind of blast furnace gas disacidifying device |
| CN111334339A (en) * | 2020-03-16 | 2020-06-26 | 山东洲蓝环保科技有限公司 | Fine desulfurization method for blast furnace gas |
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