CN114606026B - Method for simultaneously desulfurizing and dechlorinating blast furnace gas - Google Patents

Method for simultaneously desulfurizing and dechlorinating blast furnace gas Download PDF

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CN114606026B
CN114606026B CN202210444568.7A CN202210444568A CN114606026B CN 114606026 B CN114606026 B CN 114606026B CN 202210444568 A CN202210444568 A CN 202210444568A CN 114606026 B CN114606026 B CN 114606026B
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desulfurization
dechlorination
pipeline
storage tank
tank
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CN114606026A (en
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赵荣志
丁林
冷廷双
张秋林
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Beijing Beike Environmental Engineering Co ltd
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Beijing Beike Environmental Engineering Co ltd
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    • 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
    • C10K1/002—Removal of contaminants
    • C10K1/003—Removal of contaminants of acid contaminants, e.g. acid gas removal
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/20—Purifying combustible gases containing carbon monoxide by treating with solids; Regenerating spent purifying masses
    • C10K1/30—Purifying combustible gases containing carbon monoxide by treating with solids; Regenerating spent purifying masses with moving purifying masses
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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    • C10K1/32—Purifying combustible gases containing carbon monoxide with selectively adsorptive solids, e.g. active carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/30—Sulfur compounds
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Abstract

The invention relates to a method for simultaneously desulfurizing and dechlorinating blast furnace gas, which uses a device comprising a desulfurizing adsorbent blowing device and a dechlorinating agent blowing device, wherein the device is specifically arranged, a desulfurizing and dechlorinating point position is arranged at an inlet descending pipe of a blast furnace gravity dust collector, superfine powder desulfurizing and dechlorinating agent is sprayed, working conditions such as the temperature, the pressure and the like of the point position are fully utilized, a simultaneous desulfurizing and dechlorinating process suitable for the source treatment of the blast furnace gas is formed, the problems of service life, efficiency, pressure drop, waste water and the like of the current blast furnace gas fine desulfurization are solved by specifically limiting each step, the using amount of water resources is reduced on the premise of ensuring the desulfurization rate, the solid waste amount is reduced, the problems of low space velocity and large floor area are solved, and the source treatment of the blast furnace gas is really realized.

Description

Method for simultaneously desulfurizing and dechlorinating blast furnace gas
Technical Field
The invention belongs to the field of comprehensive treatment of metallurgical waste gas, and particularly relates to a method for simultaneously desulfurizing and dechlorinating blast furnace gas.
Background
At present, the requirements on energy conservation and emission reduction of the iron and steel industry are higher and higher, five committees of ecological environment department, development and reform committee, industry and trust department and the like in 2019 jointly release the opinion on promoting the implementation of ultra-low emission of the iron and steel industry, and blast furnace gas should implement fine desulfurization. The currently adopted tail end treatment mode has the problems of repeated investment, high operating cost and the like because desulfurization facilities need to be arranged at multiple points, and simultaneously, the flue gas of the blast furnace gas after being combusted by a tail end userLarge amount and is not suitable for the environmental protection requirement under the new situation. In recent years, some research has focused on the fine desulfurization of blast furnace gas by source remediation techniques. From 2019 to the present, there are three main processes for blast furnace gas fine desulfurization: 1: hydrolysis + TRT + alkali absorption acid-base neutralization; and (2) a process: hydrolysis + TRT + alkali absorption wet oxidation; and (3) a process: TRT + hydrolysis + absorption. The main difference between the three processes is the back end H 2 And (4) S removal process. In the process 1, naOH is used as an alkali source, and hydrogen sulfide in the coal gas is removed in an acid-base neutralization mode. Process 2 the absorbent adopts Na 2 CO 3 The process uses the hydrogen sulfide removal process of coke oven gas as an alkali source, oxidizes hydrogen sulfide in the gas into elemental sulfur, and removes the hydrogen sulfide through processes such as filter pressing, a sulfur melting kettle and the like. In the process 3, the activated carbon base or the iron base is used as a desulfurizer, and the hydrogen sulfide in the coal gas is removed from the coal gas in a chemical adsorption mode. The hydrolysis sections of the three processes need to be provided with a large amount of protective agents and are frequently replaced, so that the solid waste amount is large. The large-scale popularization of the three processes faces certain difficulties due to the restriction of factors such as too high concentration of the limited chloride ions, the service life of the hydrolytic agent, the rear-end absorption process and the like. Chinese patent publication CN114032120A discloses a blast furnace gas desulfurization and dechlorination purification device, which realizes simultaneous desulfurization and dechlorination, but it is a desulfurization and dechlorination structure arranged at the rear end, the structure is complex, and the removal efficiency needs to be improved. Chinese patent publication CN112915777A discloses a process for dechlorinating, desulfurizing and purifying blast furnace gas, but it is provided with a removing part at the rear end of a gravity dust collector, and uses a wet desulfurizing process, which causes a hidden adverse effect on the subsequent treatment.
Disclosure of Invention
Based on the technical problems, the invention provides a process and a device suitable for simultaneous desulfurization and dechlorination of blast furnace gas. In order to solve the problem of fine desulfurization and dechlorination of blast furnace gas from the source, the invention adopts a pure dry method simultaneous desulfurization and dechlorination process, combines the actual sulfur and chlorine content of the blast furnace, and sprays a desulfurization adsorbent and a dechlorinating agent with high activity and high specific surface area into a gravity dust collector at a downcomer at the inlet of the blast furnace gravity dust-removing raw gas by utilizing the temperature and the pressure at the position, thereby solving the problem of high sulfur and chlorine content in the gas.
The method is realized by the following technical scheme:
a device for simultaneously desulfurizing and dechlorinating blast furnace gas comprises a desulfurizing adsorbent blowing device and a dechlorinating agent blowing device.
The desulfurization adsorbent blowing device comprises a desulfurization adsorbent bin (the volume of the desulfurization adsorbent bin is preferably 20 m) 3 ) The device comprises a desulfurization storage tank, a desulfurization blowing tank, a desulfurization pipeline part and a desulfurization feeding part; the desulfurization adsorbent storage bin, the desulfurization storage tank and the desulfurization blowing tank are sequentially arranged from top to bottom, a desulfurization adsorbent feeding port is formed in the top of the desulfurization adsorbent storage bin, the desulfurization pipeline component comprises a first desulfurization pipeline, a second desulfurization pipeline, a desulfurization carrier gas pipeline and a desulfurization blowing pipeline, one end of the first desulfurization pipeline is communicated with the top of the desulfurization adsorbent storage bin, the other end of the first desulfurization pipeline is communicated with the top of the desulfurization storage tank, and a desulfurization exhaust valve is arranged on the first desulfurization pipeline; one end of the second desulfurization pipeline is communicated with the top of the desulfurization storage tank, the other end of the second desulfurization pipeline is communicated with the bottom of the desulfurization injection tank, and a desulfurization balance valve is arranged on the second desulfurization pipeline; one end of the desulfurization carrier gas pipeline is communicated with an external carrier gas supply part (such as a high-pressure nitrogen tank and the like), the other end of the desulfurization carrier gas pipeline is communicated with the bottom of the desulfurization blowing tank, and a desulfurization carrier gas valve is arranged on the desulfurization carrier gas pipeline; be provided with the desulfurization feed valve between desulfurization adsorbent feed bin and desulfurization storage tank, be provided with the desulfurization intermediate valve between desulfurization storage tank and desulfurization jetting jar, desulfurization jetting jar bottom end is provided with desulfurization jetting valve, and the bottom and the desulfurization feed unit intercommunication of desulfurization jetting jar, desulfurization feed unit is linked together through desulfurization jetting pipeline and gravity dust collector's entry downcomer department.
The dechlorination blowing device comprises a dechlorination agent bin (the volume of the dechlorination agent bin is preferably 30 m) 3 ) The device comprises a dechlorination storage tank, a dechlorination blowing tank, a dechlorination pipeline component and a dechlorination feeding component; dechlorination agent feed bin, dechlorination storage tank and dechlorination jetting jar from the top down set up in order, dechlorination agent feed bin top is provided with dechlorination agent pan feeding mouth, dechlorination agentThe pipeline part comprises a dechlorination first pipeline, a dechlorination second pipeline, a dechlorination carrier gas pipeline and a dechlorination blowing pipeline, one end of the dechlorination first pipeline is communicated with the top of a dechlorination agent bin, the other end of the dechlorination first pipeline is communicated with the top of a dechlorination material storage tank, and a dechlorination exhaust valve is arranged on the dechlorination first pipeline; one end of the dechlorination second pipeline is communicated with the top of the dechlorination storage tank, the other end of the dechlorination second pipeline is communicated with the bottom of the dechlorination blowing tank, and a dechlorination balance valve is arranged on the dechlorination second pipeline; one end of the dechlorination carrier gas pipeline is communicated with an external carrier gas supply part, the other end of the dechlorination carrier gas pipeline is communicated with the bottom of the dechlorination blowing tank, and a dechlorination carrier gas valve is arranged on the dechlorination carrier gas pipeline; be provided with the dechlorination feed valve between antichlor feed bin and dechlorination storage tank, be provided with the dechlorination intermediate valve between dechlorination storage tank and dechlorination jetting jar, dechlorination jetting tank bottom end is provided with dechlorination jetting valve, and the bottom and the dechlorination feed unit intercommunication of dechlorination jetting jar, dechlorination feed unit is linked together through dechlorination jetting pipeline and gravity dust collector's entry downcomer department.
As preferred, the device to the dechlorination of blast furnace gas desulfurization simultaneously still includes the gravity dust collector, the gravity dust collector includes gravity dust collector body, intake pipe and blast pipe, the intake pipe is used for discharging into the gravity dust collector body with blast furnace gas this is internal, the blast pipe is used for discharging the gas after the gravity dust removal or discharging the sack cleaner in, and the entry downcomer department that meets the department at intake pipe and gravity dust collector body communicates respectively desulfurization jetting pipeline and dechlorination jetting pipeline.
Preferably, the desulfuration feeding part and the dechlorination feeding part are both vertical rotary feeders.
Preferably, a material level sensor or a material weighing sensor and a pressure sensor are arranged in the desulfurization injection tank and the dechlorination injection tank; and material level sensors and pressure sensors for materials are arranged in the desulfurization storage tank and the dechlorination storage tank.
Preferably, a fluidized gas inlet is formed in the bottom of the desulfurization adsorbent bin and/or the desulfurization storage tank; the bottom of the dechlorinating agent bin and/or the dechlorinating storage tank is provided with a fluidized gas inlet.
The method for simultaneously desulfurizing and dechlorinating the blast furnace gas by adopting the device comprises the following steps:
(1) Putting the desulfurization adsorbent in a desulfurization adsorbent bin and a desulfurization blowing tank, and putting a dechlorinating agent in a dechlorinating agent bin and a dechlorinating blowing tank; the desulfurization adsorbent comprises 68-85 parts by weight of carrier, 10-30 parts by weight of active component and 1-5 parts by weight of auxiliary agent; the carrier is silicon dioxide and aluminum oxide; the active components are iron oxide and zinc oxide; the auxiliary agent is at least one of nickel, cobalt, molybdenum, manganese and zirconium; the particle size of the desulfurization adsorbent is 300-800 meshes; the dechlorinating agent is one or more of sodium carbonate, sodium bicarbonate, calcium oxide and calcium hydroxide (the dechlorinating agent can be produced by outsourcing or adding a grinder), and the particle size of the dechlorinating agent is 300-800 meshes.
(2) Sequentially opening a desulfurization gas-carrying valve and a dechlorination gas-carrying valve respectively, wherein the pressure of carrier gas is more than or equal to 0.6MPa, opening two valves arranged at the inlet of the gravity dust collector again after the pressure is stable, adjusting the flow of the carrier gas, and adjusting the flow of the carrier gas until the carrier gas of the desulfurization adsorbent blowing device is 90-110 m 3 H (preferably 100 m) 3 H), the gas carrying capacity of the dechlorinating agent injection device is 45-55 m 3 H (preferably 50 m) 3 /h)。
(3) After the carrier gas pressure and flow of the desulfurization adsorbent blowing device and the dechlorination agent blowing device are stable, respectively opening a desulfurization blowing valve and a dechlorination blowing valve, starting a desulfurization feeding part and a dechlorination feeding part, and respectively spraying the desulfurization adsorbent and the dechlorination agent in the step (1) to an inlet descending pipe of a gravity dust collector; meanwhile, the desulfurization storage tank and the dechlorination storage tank are empty, and the desulfurization feed valve and the dechlorination feed valve, the desulfurization intermediate valve and the dechlorination intermediate valve, the desulfurization exhaust valve and the dechlorination exhaust valve, and the desulfurization balance valve and the dechlorination balance valve are all closed. The blowing tank blows and the fluidized air source is supplied continuously, and the rotary feeder runs at a set rotating speed
(4) When the situation that the materials in the desulfurization injection tank and/or the dechlorination injection tank are lower than a set threshold value or the weight of the materials is lower than the set threshold value is detected, a desulfurization exhaust valve and/or a dechlorination exhaust valve are/is opened (the pressure in the desulfurization storage tank and/or the dechlorination storage tank is released), the process continues until the pressure value of the desulfurization storage tank and/or the dechlorination storage tank is reduced to 12-18 KPa (preferably 15 KPa), a desulfurization feeding valve and/or a dechlorination feeding valve are opened, a fluidized gas source (preferably nitrogen gas) arranged at the bottom outlet of a desulfurization adsorbent bin and/or a dechlorination agent bin is opened, fluidized gas is discharged from bottom to top through a fluidized gas inlet, the materials in the desulfurization adsorbent bin and/or the dechlorination storage tank are discharged into the desulfurization storage tank and/or the dechlorination storage tank, and the fluidized gas source arranged at the bottom of the desulfurization storage tank and/or the dechlorination storage tank is simultaneously opened and discharged into the fluidized gas through the fluidized gas inlet from bottom to top (the fluidized gas inlet is prevented from the materials in the storage tank from being accumulated and agglomerated).
(5) When the material level of the materials in the desulfurization storage tank and/or the dechlorination storage tank is detected to be higher than a set threshold value, closing the desulfurization feeding valve and/or the dechlorination feeding valve, stopping feeding, continuously feeding the fluidized gas source at the bottom of the desulfurization storage tank and/or the dechlorination storage tank, continuously increasing the pressure in the desulfurization storage tank and/or the dechlorination storage tank, opening the desulfurization intermediate valve and/or the dechlorination intermediate valve (the materials in the storage tank fall into the blowing tank by the gravity of the storage tank) when the pressure in the desulfurization storage tank and/or the dechlorination storage tank is consistent with the pressure in the desulfurization blowing tank and/or the dechlorination blowing tank), and when the material level of the materials in the desulfurization blowing tank and/or the dechlorination blowing tank is detected to be higher than the set threshold value, opening the desulfurization balance valve and/or the dechlorination balance valve, and closing the fluidized gas source at the bottom of the desulfurization storage tank and/or the dechlorination storage tank after 0.5-5 min (preferably 1-2 min), the desulfurization intermediate valve and/or the dechlorination balance valve (completion of the tank).
(6) And (5) when the materials in the desulfurization injection tank and/or the dechlorination injection tank are detected to be lower than the set threshold value or the weight of the materials is detected to be lower than the set threshold value again, repeating the steps (4) and (5) until the blast furnace gas is simultaneously desulfurized and dechlorinated.
The blowing tank is provided with a weighing and metering system (a weight sensor, a material level sensor, a pressure sensor and the like), the actual blowing amount is calculated, and after the actual blowing amount is compared with the blowing amount set by the control system, the actual blowing amount is close to the set blowing amount by adjusting the rotating speed of the motor of the rotary feeder, so that higher blowing precision is ensured.
Preferably, the preparation method of the desulfurization adsorbent comprises the following steps: preparing 68-85 parts of carrier, 10-30 parts of active component and 1-5 parts of assistant by weight, then adding 1-2 parts of sesbania powder and 0.5-1 part of citric acid by weight, and adding water for mixing, wherein the weight ratio of water to the materials (water-powder ratio) is (0.9-1.1): 1, drying after uniformly mixing; and then placing the dried mixed material into a roasting furnace to be roasted for 2-6 h at the temperature of 450-650 ℃, then placing the roasted mixed material into a grinding machine to be ground, and grinding to obtain the desulfurization adsorbent with the particle size of 300-800 meshes.
Preferably, the carrier gas of the desulfurization adsorbent blowing apparatus and the carrier gas of the dechlorination agent blowing apparatus are both nitrogen gas.
Preferably, the weight ratio of the silicon dioxide to the aluminum oxide in the carrier in the step (1) is (15-30): (70-85); the weight ratio of the iron oxide to the zinc oxide in the active component is (70-90): (10 to 30).
Preferably, the fluidizing gas is nitrogen.
Preferably, the specific surface area of the desulfurization adsorbent in the step (1) is 110-220 square meters per gram, the specific surface area of the dechlorination agent is 70-150 square meters per gram, and the operating pressure of the desulfurization feeding part and the dechlorination feeding part is not less than 0.6MPa (namely, carrier gas nitrogen and powder carried by the carrier gas nitrogen are fed into a gravity dust collector under the pressure of not less than 0.6 MPa).
The invention has the technical effects that:
the process device and the method firstly arrange the desulfurization and dechlorination point position at the inlet downcomer of the gravity dust collector of the blast furnace, and fully utilize the working conditions of the point position such as temperature, pressure and the like by spraying the ultrafine powder desulfurization and dechlorination agent to form the simultaneous desulfurization and dechlorination process suitable for the source control of the blast furnace gas.
2, by adopting the specific desulfurization adsorbent and dechlorinating agent with small particle size and high specific surface area, the method respectively removes other acid gases such as hydrogen sulfide, carbonyl sulfide and hydrogen chloride in the blast furnace gas with high efficiency, solves the problems of service life, efficiency, pressure drop, waste water and the like of the prior blast furnace gas fine desulfurization, and has the following advantages on the premise of ensuring the desulfurization rate: by reasonably arranging the desulfurization and dechlorination point positions and the desulfurization adsorbent and the dechlorination agent, the flow field flow velocity in the gravity dust removal is fully utilized, the desulfurizer and the dechlorination agent are ensured to fully react with sulfide and chloride in the coal gas, and the effect that the retention time is far longer than that of a rear-end process is realized; meanwhile, both desulfurization and dechlorination are dry processes, and waste water is not required to be considered, so that the use amount of water resources is greatly reduced; the high activity and the high specific surface area of the desulfurizer are realized by reasonably setting the desulfurizer and the dechlorinating agent to match with specific process steps and device setting modes, so that the solid waste amount is reduced to the maximum extent. The method not only solves the problems of large waste water amount and large alkali liquor consumption caused by hydrogen sulfide removal by the traditional alkali method, but also solves the problems of low airspeed and large occupied area caused by complex components, large gas amount and different working conditions of the blast furnace gas and the coke oven gas, and truly realizes the control of the source of the blast furnace gas.
3, by reasonably arranging the whole device of the invention, the whole device has small occupied area, simple operation and high automation degree, and does not influence the subsequent equipment use of the blast furnace.
Drawings
FIG. 1 is a schematic process flow diagram of a simultaneous desulfurization and dechlorination apparatus for blast furnace gas in example 1.
Wherein: 1-blast furnace, 201-desulfurizing adsorbent bin, 202-desulfurizing storage tank, 203-desulfurizing blowing tank, 204-desulfurizing first pipeline, 205-desulfurizing second pipeline, 206-desulfurizing carrier gas pipeline, 207-desulfurizing blowing pipeline, 208-desulfurizing exhaust valve, 209-desulfurizing balance valve, 210-desulfurizing carrier gas valve, 211-desulfurizing feed valve, 212-desulfurizing intermediate valve, 3-gravity dust remover, 301-gas inlet pipe, 302-inlet descending pipe, 303-gas outlet pipe, 401-dechlorinating agent bin, 402-dechlorinating storage tank, 403-dechlorinating blowing tank, 404-dechlorinating first pipeline, 405-dechlorinating second pipeline, 406-dechlorinating carrier gas pipeline, 407-blowing pipeline, 408-dechlorinating exhaust valve, 409-dechlorinating balance valve, 410-dechlorinating carrier gas valve, 411-dechlorinating feed valve, 412-dechlorinating intermediate valve, 5-bag dust collector, A-nitrogen, B-desulfurizing adsorbent, C-dechlorinating agent.
Detailed Description
The technical scheme of the invention is further explained by combining the drawings and the embodiment:
example 1
As shown in fig. 1: the device for simultaneously desulfurizing and dechlorinating the blast furnace gas comprises a desulfurizing adsorbent blowing device and a dechlorinating agent blowing device.
The desulfurization adsorbent blowing device comprises a desulfurization adsorbent bin (the volume of the desulfurization adsorbent bin is preferably 20 m) 3 ) The device comprises a desulfurization storage tank, a desulfurization blowing tank, a desulfurization pipeline part and a desulfurization feeding part; the desulfurization adsorbent bin, the desulfurization storage tank and the desulfurization injection tank are sequentially arranged from top to bottom, a desulfurization adsorbent feeding port is arranged at the top of the desulfurization adsorbent bin, the desulfurization pipeline component comprises a desulfurization first pipeline, a desulfurization second pipeline, a desulfurization carrier gas pipeline and a desulfurization injection pipeline, one end of the desulfurization first pipeline is communicated with the top of the desulfurization adsorbent bin, the other end of the desulfurization first pipeline is communicated with the top of the desulfurization storage tank, and a desulfurization exhaust valve is arranged on the desulfurization first pipeline; one end of the second desulfurization pipeline is communicated with the top of the desulfurization storage tank, the other end of the second desulfurization pipeline is communicated with the bottom of the desulfurization injection tank, and a desulfurization balance valve is arranged on the second desulfurization pipeline; one end of the desulfurization carrier gas pipeline is communicated with an external carrier gas supply part, the other end of the desulfurization carrier gas pipeline is communicated with the bottom of the desulfurization blowing tank, and a desulfurization carrier gas valve is arranged on the desulfurization carrier gas pipeline; be provided with the desulfurization feed valve between desulfurization adsorbent feed bin and desulfurization storage tank, be provided with the desulfurization intermediate valve between desulfurization storage tank and desulfurization jetting jar, desulfurization jetting jar bottom end is provided with desulfurization jetting valve, and the bottom and the desulfurization feed unit intercommunication of desulfurization jetting jar, desulfurization feed unit is linked together through desulfurization jetting pipeline and gravity dust collector's entry downcomer department. The desulfurization feeding part is a vertical rotary feeder.
The dechlorination blowing device comprises a dechlorination agent bin (the volume of the dechlorination agent bin is preferably 30 m) 3 ) The device comprises a dechlorination material storage tank, a dechlorination blowing tank, a dechlorination pipeline component and a dechlorination feeding component; the dechlorinating agentThe dechlorination device comprises a storage bin, a dechlorination storage tank and a dechlorination blowing tank which are sequentially arranged from top to bottom, wherein a dechlorination agent feeding port is formed in the top of the dechlorination agent storage bin; one end of a dechlorination second pipeline is communicated with the top of the dechlorination storage tank, the other end of the dechlorination second pipeline is communicated with the bottom of the dechlorination blowing tank, and a dechlorination balance valve is arranged on the dechlorination second pipeline; one end of the dechlorination carrier gas pipeline is communicated with an external carrier gas supply part, the other end of the dechlorination carrier gas pipeline is communicated with the bottom of the dechlorination blowing tank, and a dechlorination carrier gas valve is arranged on the dechlorination carrier gas pipeline; be provided with the dechlorination feed valve between antichlor feed bin and dechlorination storage tank, be provided with the dechlorination intermediate valve between dechlorination storage tank and dechlorination jetting jar, dechlorination jetting tank bottom end is provided with dechlorination jetting valve, and the bottom and the dechlorination feed unit intercommunication of dechlorination jetting jar, dechlorination feed unit is linked together through dechlorination jetting pipeline and gravity dust collector's entry downcomer department. And the dechlorination feeding parts are all vertical rotary feeders.
As shown in fig. 1, the device still includes the gravity dust collector (meets with the gravity dust collector and uses), the gravity dust collector includes gravity dust collector body, intake pipe and blast pipe, the intake pipe is used for discharging into this internal with the blast furnace gas to the gravity dust collector, the blast pipe is used for discharging the gas after the gravity dust removal or discharging into the sack cleaner in, and the entry downcomer department that meets department at intake pipe and gravity dust collector body communicates respectively desulfurization jetting pipeline and dechlorination jetting pipeline.
In the embodiment, material level sensors or material weighing sensors and pressure sensors are arranged in the desulfurization injection tank and the dechlorination injection tank; a material level sensor and a pressure sensor (not shown in figure 1) are arranged in the desulfurization storage tank and the dechlorination storage tank.
Example 2
Some 450000Nm 3 The hydrogen chloride content of the blast furnace gas is 30-50 mg/Nm 3 The content of hydrogen sulfide is 30-60 mg/Nm 3 The content of carbonyl sulfide is 80-150 mg/Nm 3 The temperature is 100-200 ℃, and the pressure is 0.2-0.25 MPa. Under the normal operation condition of the blast furnace, the device of the embodiment 1 is adopted to carry out the following operations in sequence:
1, before the system operates, the preparation of materials in a desulfurizer bin and a dechlorination agent bin is completed, and the material levels in a desulfurization injection tank and a dechlorination injection tank are high. Wherein the desulfurizer D90 is more than or equal to 325 meshes, and the dechlorinating agent D90 is more than or equal to 325 meshes.
2, opening nitrogen valves of a main pipeline of the desulfurization system and the dechlorination system in sequence (the nitrogen pressure is more than or equal to 0.6 MPa), opening two valves at the inlet of the gravity dust collector again after the pressure is stable, adjusting the nitrogen flow, and adjusting the nitrogen flow of the desulfurization system to be 100m 3 H, the nitrogen flow of the dechlorination system is adjusted to 50m 3 /h。
And 3, the pressure and the flow of the nitrogen system are stable, and after the injection quantities of the desulfurizing agent and the dechlorinating agent are set, outlet valves of injection tanks of the desulfurizing system and the dechlorinating system are respectively opened, and the rotating speed of a motor of the rotary feeder is adjusted to enable the actual injection quantity to be close to the set injection quantity, so that higher injection precision is ensured. At this point both sets of systems start up.
And 4, during the operation of the system, performing the following operations (each component is respectively the component for desulfurization and/or denitrification):
a) When in normal blowing, the storage tank is empty, the outlet valve of the desulfurizing agent bin/dechlorinating agent bin, the feed valve of the storage tank, the exhaust valve, the intermediate valve (the feed valve of the blowing tank) and the balance valve are all in a closed state, the blowing of the blowing tank and the supply of a fluidized air source are ceaselessly supplied, and the rotary feeder operates at a set rotating speed.
b) When the material of the blowing tank is lower than a set material level threshold value (the threshold value is 5-15% of the volume height of the blowing tank for example), the PLC sends a signal, the exhaust valve of the storage tank is opened, the pressure in the storage tank is released, the balance valve and the intermediate valve are still in a closed state, when the pressure of the storage tank shows that the pressure is reduced to 15kPa, the outlet valve of the desulfurizer bin/dechlorination agent bin and the feed valve of the storage tank are opened, the fluidized air source at the outlet of the desulfurizer bin/dechlorination agent bin is opened at the same time, the material starts to be charged, and when the material is charged, the fluidized air source at the bottom of the storage tank is opened, so that the material in the storage tank is prevented from being stacked and agglomerated.
c) When the storage tank is filled to a high material level (the threshold value is 85-95% of the volume height of the storage tank for example), the material level meter sends out a signal, after a short time delay, the outlet valve of the adsorbent bin/dechlorination agent bin, the feeding valve of the storage tank and the exhaust valve are closed in sequence, and the filling is stopped. The fluidized air source at the bottom of the storage tank still enters the storage tank continuously, and the pressure of the storage tank rises.
d) When the pressure of the storage tank reaches the same value as the pressure of the injection tank, the intermediate valve (the feed valve of the injection tank is opened) allows the materials in the storage tank to fall into the injection tank by the gravity of the storage tank, and the air inlet valve at the top of the storage tank is opened to assist the discharging. After a set time, the storage tank is closed, the balance valve is opened, and after a period of time, the fluidized air source, the intermediate valve (the feeding valve of the blowing tank) and the balance valve of the storage tank are closed, so that the tank transfer is completed.
e) When the material level of the injection tank is reduced to be lower than the low material level, the exhaust valve of the storage tank is opened, and the storage tank starts to carry out new loading, so that an operation period is completed. The blast furnace gas is subjected to desulfurization and dechlorination and gravity dust removal in a gravity dust remover and then is subjected to continuous dust removal treatment by a conventional bag-type dust remover.
By detecting the embodiment 2, the content of the hydrogen chloride in the clean coal gas at the outlet of the blast furnace bag-type dust remover is less than 10mg/Nm 3 Hydrogen sulfide content < 5mg/Nm 3 Carbonyl sulfide content < 10mg/Nm 3 And a predetermined effect is achieved. The sulfur dioxide content after combustion by the end user meets the ultra-low emission requirement.
Comparative example 1
In the comparative example, the devices for simultaneously desulfurizing and dechlorinating the blast furnace gas in the embodiments 1 and 2 are not arranged on the gravity dust collector, the blast furnace gas is subjected to gravity dust collection and then to conventional cloth bag dust collection, and the coal gas of the comparative example is detected, wherein the content of hydrogen chloride is 45mg/Nm 3 The hydrogen sulfide content was 38mg/Nm 3 The content of carbonyl sulfide is 120mg/Nm 3 . After power generation, the gas pipeline is seriously corroded, and the content of sulfur dioxide after combustion of a terminal user can not meet the emission requirement.

Claims (9)

1. A method for simultaneously desulfurizing and dechlorinating blast furnace gas is characterized in that a device for simultaneously desulfurizing and dechlorinating the blast furnace gas is adopted, and the device comprises a desulfurizing adsorbent blowing device and a dechlorinating agent blowing device;
the desulfurization adsorbent injection device comprises a desulfurization adsorbent bin, a desulfurization storage tank, a desulfurization injection tank, a desulfurization pipeline part and a desulfurization feeding part; the desulfurization adsorbent storage bin, the desulfurization storage tank and the desulfurization blowing tank are sequentially arranged from top to bottom, a desulfurization adsorbent feeding port is formed in the top of the desulfurization adsorbent storage bin, the desulfurization pipeline component comprises a first desulfurization pipeline, a second desulfurization pipeline, a desulfurization carrier gas pipeline and a desulfurization blowing pipeline, one end of the first desulfurization pipeline is communicated with the top of the desulfurization adsorbent storage bin, the other end of the first desulfurization pipeline is communicated with the top of the desulfurization storage tank, and a desulfurization exhaust valve is arranged on the first desulfurization pipeline; one end of the second desulfurization pipeline is communicated with the top of the desulfurization storage tank, the other end of the second desulfurization pipeline is communicated with the bottom of the desulfurization injection tank, and a desulfurization balance valve is arranged on the second desulfurization pipeline; one end of the desulfurization carrier gas pipeline is communicated with an external carrier gas supply part, the other end of the desulfurization carrier gas pipeline is communicated with the bottom of the desulfurization blowing tank, and a desulfurization carrier gas valve is arranged on the desulfurization carrier gas pipeline; a desulfurization feeding valve is arranged between the desulfurization adsorbent bin and the desulfurization storage tank, a desulfurization intermediate valve is arranged between the desulfurization storage tank and the desulfurization injection tank, a desulfurization injection valve is arranged at the bottom end of the desulfurization injection tank, the bottom end of the desulfurization injection tank is communicated with a desulfurization feeding part, and the desulfurization feeding part is communicated with an inlet descending pipe of the gravity dust collector through a desulfurization injection pipeline;
the dechlorination agent injection device comprises a dechlorination agent bin, a dechlorination material storage tank, a dechlorination injection tank, a dechlorination pipeline component and a dechlorination feeding component; the dechlorination device comprises a dechlorination agent bin, a dechlorination storage tank and a dechlorination blowing tank, wherein the dechlorination agent bin, the dechlorination storage tank and the dechlorination blowing tank are sequentially arranged from top to bottom, a dechlorination agent feeding port is formed in the top of the dechlorination agent bin, the dechlorination pipeline component comprises a dechlorination first pipeline, a dechlorination second pipeline, a dechlorination carrier gas pipeline and a dechlorination blowing pipeline, one end of the dechlorination first pipeline is communicated with the top of the dechlorination agent bin, the other end of the dechlorination first pipeline is communicated with the top of the dechlorination storage tank, and a dechlorination exhaust valve is arranged on first pipeline; one end of the dechlorination second pipeline is communicated with the top of the dechlorination storage tank, the other end of the dechlorination second pipeline is communicated with the bottom of the dechlorination blowing tank, and a dechlorination balance valve is arranged on the dechlorination second pipeline; one end of the dechlorination carrier gas pipeline is communicated with an external carrier gas supply part, the other end of the dechlorination carrier gas pipeline is communicated with the bottom of the dechlorination blowing tank, and a dechlorination carrier gas valve is arranged on the dechlorination carrier gas pipeline; a dechlorination feed valve is arranged between the dechlorination agent bin and the dechlorination storage tank, a dechlorination intermediate valve is arranged between the dechlorination storage tank and the dechlorination injection tank, a dechlorination injection valve is arranged at the bottom end of the dechlorination injection tank, the bottom end of the dechlorination injection tank is communicated with a dechlorination feed part, and the dechlorination feed part is communicated with an inlet descending pipe of the gravity dust collector through a dechlorination injection pipeline;
the method comprises the following steps:
(1) Putting the desulfurization adsorbent in a desulfurization adsorbent bin and a desulfurization blowing tank, and putting a dechlorinating agent in a dechlorinating agent bin and a dechlorinating blowing tank; the desulfurization adsorbent comprises 68-85 parts by weight of a carrier, 10-30 parts by weight of an active component and 1-5 parts by weight of an auxiliary agent; the carrier is silicon dioxide and aluminum oxide; the active components are iron oxide and zinc oxide; the auxiliary agent is at least one of nickel, cobalt, molybdenum, manganese and zirconium; the particle size of the desulfurization adsorbent is 300-800 meshes; the dechlorinating agent is one or more of sodium carbonate, sodium bicarbonate, calcium oxide and calcium hydroxide, and the particle size of the dechlorinating agent is 300-800 meshes;
(2) Sequentially and respectively opening a desulfurization gas carrying valve and a dechlorination gas carrying valve, wherein the pressure of carrier gas is more than or equal to 0.6MPa, after the pressure is stable, opening two valves arranged at the inlet of a gravity dust collector, adjusting the flow of carrier gas until the gas carrying capacity of a desulfurization adsorbent blowing device is 90 to 110m powder/h, and performing arc transportation on a dechlorination agent blowing device at 45 to 55m/h;
(3) After the carrier gas pressure and flow of the desulfurization adsorbent blowing device and the dechlorination agent blowing device are stable, respectively opening a desulfurization blowing valve and a dechlorination blowing valve, starting a desulfurization feeding part and a dechlorination feeding part, and respectively spraying the desulfurization adsorbent and the dechlorination agent in the step (1) to an inlet descending pipe of a gravity dust collector; meanwhile, the desulfurization storage tank and the dechlorination storage tank are empty, and the desulfurization feed valve and the dechlorination feed valve, the desulfurization intermediate valve and the dechlorination intermediate valve, the desulfurization exhaust valve and the dechlorination exhaust valve, the desulfurization balance valve and the dechlorination balance valve are all closed;
(4) When the material level of the materials in the desulfurization blowing tank and/or the dechlorination blowing tank is lower than a set threshold value or the weight of the materials is lower than the set threshold value, opening a desulfurization exhaust valve and/or a dechlorination exhaust valve, continuously opening a desulfurization feed valve and/or a dechlorination feed valve until the pressure value of the desulfurization storage tank and/or the dechlorination storage tank is reduced to 12 to 18KPa, simultaneously opening a fluidization gas source arranged at the bottom of a desulfurization adsorbent bin and/or a dechlorination agent bin, discharging the materials in the desulfurization adsorbent bin and/or the dechlorination agent bin into the desulfurization storage tank and/or the dechlorination storage tank, simultaneously opening the fluidization gas source at the bottom of the desulfurization storage tank and/or the dechlorination storage tank, and discharging the fluidization gas from bottom to top;
(5) When the material level of the materials in the desulfurization storage tank and/or the dechlorination storage tank is detected to be higher than a set threshold value, closing the desulfurization feeding valve and/or the dechlorination feeding valve, stopping feeding, continuously feeding a fluidized air source at the bottom of the desulfurization storage tank and/or the dechlorination storage tank, continuously increasing the pressure in the desulfurization storage tank and/or the dechlorination storage tank, opening the desulfurization intermediate valve and/or the dechlorination intermediate valve when the pressure in the desulfurization storage tank and/or the dechlorination storage tank is consistent with the pressure in the desulfurization blowing tank and/or the dechlorination blowing tank, enabling the desulfurization adsorbent and/or the dechlorination agent to fall into the desulfurization blowing tank and/or the dechlorination blowing tank by means of gravity, opening the desulfurization balance valve and/or the dechlorination balance valve when the material level of the materials in the desulfurization blowing tank and/or the dechlorination blowing tank is detected to be higher than the set threshold value, and closing the fluidized air source at the bottom of the desulfurization storage tank and/or the dechlorination balance valve after lasting for 1 to 2min;
(6) And (5) when the material level of the materials in the desulfurization injection tank and/or the dechlorination injection tank is detected to be lower than the set threshold value or the weight of the materials is detected to be lower than the set threshold value again, repeating the steps (4) and (5) until the blast furnace gas is simultaneously desulfurized and dechlorinated.
2. The method for simultaneously desulfurizing and dechlorinating blast furnace gas according to claim 1, wherein the gravity dust collector comprises a gravity dust collector body, an air inlet pipe and an air outlet pipe, the air inlet pipe is used for discharging the blast furnace gas into the gravity dust collector body, the air outlet pipe is used for discharging the gas after gravity dust collection or discharging the gas into a bag-type dust collector, and the desulfurization injection pipeline and the dechlorination injection pipeline are respectively communicated with an inlet descending pipe at the joint of the air inlet pipe and the gravity dust collector body.
3. The method for simultaneously desulfurizing and dechlorinating blast furnace gas according to claim 1, wherein the desulfurizing feeding part and the dechlorinating feeding part are both vertical rotary feeding machines.
4. The method for simultaneously desulfurizing and dechlorinating blast furnace gas according to claim 1, wherein a material level sensor or a material weighing sensor and a pressure sensor are arranged in the desulfurizing injection tank and the dechlorinating injection tank; a material level sensor and a pressure sensor of materials are arranged in the desulfurization storage tank and the dechlorination storage tank; a fluidized gas inlet is formed at the bottom of the desulfurization adsorbent bin and/or the desulfurization storage tank; the bottom of the dechlorinating agent bin and/or the dechlorinating storage tank is also provided with a fluidized gas inlet.
5. The method for simultaneously desulfurizing and dechlorinating blast furnace gas according to claim 1, characterized in that the desulfurizing adsorbent is prepared by the following steps: mixing 68-85 parts by weight of a carrier, 10-30 parts by weight of an active component and 1-5 parts by weight of an auxiliary agent, then adding 1-2 parts by weight of sesbania powder and 0.5-1 part by weight of citric acid, and adding water for mixing, wherein the total weight ratio of the water to other materials is (0.9-1.1): 1, drying after uniformly mixing; and then placing the dried mixed material into a roasting furnace, roasting for 2 to 6 hours at the temperature of 450 to 650 ℃, then placing the roasted mixed material into a grinding machine, grinding, and obtaining the desulfurization adsorbent with the particle size of 300 to 800 meshes.
6. The method for simultaneously desulfurizing and dechlorinating blast furnace gas according to claim 1, wherein the carrier gas of the desulfurizing adsorbent blowing device and the carrier gas of the dechlorinating agent blowing device are both nitrogen gas.
7. The method for simultaneously desulfurizing and dechlorinating blast furnace gas according to claim 1, wherein the weight ratio of the silicon dioxide to the aluminum oxide in the carrier is (15 to 30): (70 to 85); the weight ratio of iron oxide to zinc oxide in the active components is (70 to 90): (10 to 30).
8. The process for the simultaneous desulfurization and dechlorination of blast furnace gas according to claim 1, characterized in that the fluidizing gas is nitrogen.
9. The method for simultaneously desulfurizing and dechlorinating blast furnace gas according to claim 1, wherein the specific surface area of the desulfurization adsorbent is 110 to 220 square meters per gram, the specific surface area of the dechlorination agent is 70 to 150 square meters per gram, and the operating pressure of the desulfurization feeding component and the dechlorination feeding component is not less than 0.6MPa.
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CN111378801A (en) * 2020-03-30 2020-07-07 北京北大先锋科技有限公司 Process method and device for removing hydrogen chloride by powder injection of blast furnace gas pipeline
CN113952826A (en) * 2021-11-25 2022-01-21 山东钢铁集团日照有限公司 Method and equipment for removing sulfide from blast furnace gas

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