CN110305699B - System and method for purifying and upgrading TRT (blast furnace gas) by wet separation, dust removal, desulfurization and chlorine removal after dry dedusting - Google Patents

System and method for purifying and upgrading TRT (blast furnace gas) by wet separation, dust removal, desulfurization and chlorine removal after dry dedusting Download PDF

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CN110305699B
CN110305699B CN201910596330.4A CN201910596330A CN110305699B CN 110305699 B CN110305699 B CN 110305699B CN 201910596330 A CN201910596330 A CN 201910596330A CN 110305699 B CN110305699 B CN 110305699B
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spraying
gas
trt
group
structures
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CN110305699A (en
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常景彩
马春元
张彪
刘玉阁
张鑫
闫瑞
张晓林
王璞
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Shandong University
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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
    • C10K1/02—Dust removal
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/04—Purifying combustible gases containing carbon monoxide by cooling to condense non-gaseous materials
    • C10K1/06—Purifying combustible gases containing carbon monoxide by cooling to condense non-gaseous materials combined with spraying with water
    • 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
    • C10K1/08—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency
    • Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines

Abstract

The invention discloses a system and a method for purifying and upgrading coal gas subjected to dry dedusting TRT by using moisture separation, dedusting, desulfurization and chlorine separation, wherein the system comprises: the system comprises a washing tower system and an adsorption bed, wherein the washing tower system comprises a washing tower and a cooler; a spraying layer is arranged above the washing tower, a spraying pool is arranged below the washing tower, at least two groups of spraying structures are arranged in the spraying layer and respectively comprise a first group of spraying structures and a second group of spraying structures, the first group of spraying structures are positioned at the upstream of the second group of spraying structures, the first group of spraying structures are connected with the spraying pool through a first pump, and the second group of spraying structures are connected with the spraying pool through a cooler and a second pump; at least one adsorption unit is arranged in the adsorption bed along the flowing direction of the coal gas, a row of inclined baffles are arranged at the coal gas inlet and the coal gas outlet of each adsorption unit, the inclined directions of the inclined baffles of each row are the same, and the coal gas inlet or the coal gas outlet is divided into a plurality of inclined channels; the inclination directions of two adjacent rows of inclined baffles are mirror images.

Description

System and method for purifying and upgrading TRT (blast furnace gas) by wet separation, dust removal, desulfurization and chlorine removal after dry dedusting
Technical Field
The invention belongs to the field of metallurgical energy, and particularly relates to a system and a method for purifying and upgrading gas subjected to dry dedusting TRT by separating moisture, removing dust, desulfurizing chlorine.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The method has the advantages of improving the utilization rate of coal gas, strengthening the recycling of resources and reducing the fuel ratio in the iron-making work, and is one of the main energy-saving and emission-reducing methods in the iron-making industry at present. The TRT (blast furnace top gas recovery turbine) excess pressure power generation technology utilizes pressure energy and heat energy of blast furnace top gas to apply work to the gas and convert the work into mechanical energy, and effectively promotes energy conservation and emission reduction of a steel plant.
In fact, the dust content in the raw gas directly discharged from the blast furnace is 10-50 g/m3And the dust is removed firstly and then enters a TRT system. A two-stage treatment mode is generally adopted, wherein the primary dust removal mode comprises a gravity dust removal mode, a cyclone dust removal mode and a gravity and small cyclone mode, and the dust removal efficiency is generally 50-80%. The secondary fine dust removal process is mainly divided into dry dust removal and wet dust removal. The wet dust removal process is a double Venturi system and a Bischoff system of an early wet method. The cleaned gas after liquid washing is led out from the cyclone dehydrator, subjected to TRT power generation and pressure reduction and then enters the filler dehydrator for further dehydration, and the dust content in the gas can be reduced to 10mg/m3The following. But the water content of the coal gas is 80-200 g/Nm by the wet dust removal technology3The problems of low sensible heat of the coal gas, large occupied area, difficult sludge disposal and the like exist, and a separate water treatment system needs to be matched with the coal gas. The dry-type cloth bag dust removal technology gradually replaces the wet dust removal technology with the advantages of high gas calorific value, low energy consumption and the like, and has been applied to domestic newly-built blast furnaces in recent years. But the HCl content of the gas was about 100mg/m3The sulfuric acid content is about 50mg/m3，CO2The content of the acidic gas is 17-21%, and the acidic gas and the components cannot be removed in the bag-type dust removal process and are brought into downstream equipment and users. The water content of the dry dedusting coal gas is generally 30-60 g/Nm3With the extension of the conveying pipe network and the reduction of the gas temperature, condensed water dissolved in acid gas and components can be separated out to form a highly acidic corrosive solution, which seriously affects the service life and the use of the pipe network and the accessory equipment thereof and becomes a main factor restricting the safe operation of the boiler, the TRT gas pipeline and the accessory equipment thereof. In order to relieve the current situation of equipment corrosion, after the TRT system utilizes the residual pressure and the waste heat of the blast furnace gas, a gas washing device is additionally arranged before the gas enters a pipe networkThe gas is cooled to below the dew point by a purifying tower (also called as a desalting tower and a chlorine washing tower), saturated water in the gas is fully separated out to the maximum extent, and the added alkali liquor neutralizes dissolved acidic substances, so that large-area corrosion of subsequent pipeline equipment is avoided. However, the inventor finds that the calorific value of the gas is greatly reduced due to the fact that the gas carries a large amount of mechanical water, waste alkali liquor is generated, and a treatment system is complex.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention aims to provide a system and a method for purifying and upgrading gas after TRT (blast furnace top gas recovery) by separating out moisture, removing dust, desulfurizing chlorine, so as to solve the problem of corrosion of subsequent equipment caused by gas separation moisture, separating out acid, which is difficult to overcome in the prior TRT technology, improve the heat value of the gas, raise the combustion temperature, further reduce the coke ratio, and be beneficial to energy conservation and emission reduction in the metallurgical steel industry.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the coal gas after dry dedusting TRT is separated out wet, is dedusted and is desulfurized in a purifying and quality-improving system with the dust-removing desulfurization rate, which comprises: the system comprises a washing tower system and an adsorption bed, wherein the washing tower system comprises a washing tower and a cooler;
a spraying layer is arranged above the washing tower, a spraying pool is arranged below the washing tower, at least two groups of spraying structures are arranged in the spraying layer and respectively comprise a first group of spraying structures and a second group of spraying structures, the first group of spraying structures are positioned at the upstream of the second group of spraying structures, the first group of spraying structures are connected with the spraying pool through a first pump, and the second group of spraying structures are connected with the spraying pool through a cooler and a second pump;
at least two adsorption units are arranged in the adsorption bed along the flowing direction of the coal gas, an adsorbent is filled in each adsorption unit, a row of inclined baffles are arranged at the coal gas inlet and the coal gas outlet of each adsorption unit, the inclined directions of the inclined baffles in each row are the same, and the coal gas inlet or the coal gas outlet is divided into a plurality of inclined channels;
the inclination directions of two adjacent rows of inclined baffles are mirror-symmetrical;
the inlet of the washing tower is connected with a coal gas source, and the outlet of the washing tower is connected with the inlet of the adsorption bed.
After entering a washing tower, the coal gas sequentially flows through a first group of spraying structures and a second group of spraying structures, the first group of spraying structures spray spraying liquid with a slightly high temperature to primarily cool the coal gas, the second group of spraying structures spray spraying liquid with a lower temperature to secondarily cool the coal gas, the coal gas is subjected to variable temperature spraying for at least two times, the coal gas (60-130 ℃, the mass fraction of water content is 6-10%) subjected to dry dedusting TRT is humidified and cooled to low-temperature saturated coal gas, gaseous water in the coal gas is forced to be separated out, and condensed water-soluble acid removes dust along with the separation process of the gaseous water in the coal gas, so that the heat value of clean coal gas is increased, the temperature of a hot blast stove is increased.
In some embodiments, a partition plate is arranged in the spray tank to divide the interior of the spray tank into a first area and a second area, the first area is located below the first group of spray structures, the second area is located below the second group of spray structures, the first pump is communicated with the first area, and the second pump is communicated with the second area.
The core of the variable-temperature spraying process is that the primary cooling spraying liquid is circulated in a spraying tower, a silicon carbide nozzle is selected for atomizing, the grain size is 500-3000 microns, 70-80% of dust and acid components contained in coal gas are washed into the spraying tower, the content of pollutant components in the circulating liquid is higher than that in the secondary cooling spraying, the pH value of the solution is less than or equal to 4, and the temperature is 45-55 ℃; the secondary spray liquid is a cold liquid storage tank circulating outside the tower, the pollutant component content of the secondary cooling spray liquid is low, the pH value is basically neutral, the temperature is 25-39 ℃, the atomized particle size is 100-1000 microns, and liquid drops are fully contacted with coal gas, forcibly cooled by a mechanical air cooling tower and returned to the cold liquid storage tank. Through the components of a whole that can function independently of secondary cooling spray liquid and primary cooling spray liquid, secondary cooling spray liquid has the characteristics of lower pollutant component content, basically neutral pH value, low temperature and the like, which is the premise that high-pressure fine particle atomization can be selected for secondary cooling spray liquid, and is the key for realizing the purposes of condensing water-soluble acid to remove dust and preventing the mechanical air cooling tower from being blocked by filling materials.
Because a large amount of acid in the coal gas is removed, the problem that subsequent pipeline equipment is corroded by acid condensate liquid can be effectively solved, and condensate water separated out from the coal gas can enter a system for recycling after being treated by a plant area treatment unit.
The adsorbent is filled in the adsorption bed, and can adsorb substances such as moisture, residual hydrogen chloride, sulfuric acid gas, carbon dioxide and the like in the coal gas, so that the coal gas is further purified and upgraded, and the hidden trouble of acid-condensed liquid corrosion of subsequent pipeline equipment is solved.
Be provided with a plurality of adsorption unit in the adsorption bed, every adsorption unit's import and export all are provided with one row of slope baffle, and the slope baffle separates into a plurality of slope passageways with the import or the export of coal gas, will follow the leading-in adsorption unit of coal gas along the incline direction that the coal gas of coal gas import inflow in, can prolong the dwell time of coal gas in every adsorption unit, and then improve the purifying effect to coal gas.
The inclined baffle arranged at the gas outlet is in mirror symmetry with the inclined baffle arranged at the gas inlet, so that on one hand, the flow direction of the gas in the adsorption unit can be changed, and in the process of changing the flow direction of the gas, a small amount of adsorbent carried by the high-speed gas is intercepted due to the inertia effect, so that the loss of the adsorbent can be effectively prevented; on the other hand, the inclined baffle at the coal gas outlet can lead the coal gas into the next adsorption unit for adsorption in an inclined way, so that the coal gas is baffled in the whole adsorption bed, the flow path of the coal gas is prolonged, and the purification degree of the coal gas is improved.
In some embodiments, the first group of spraying structures comprises at least one first water distributor and a plurality of spray heads, the first water distributor is vertically arranged, the plurality of spray heads are arranged on the first water distributor, vertically distributed and cover the flow channel of the coal gas.
The inventor finds that when the gas is sprayed on the top of the washing tower, the upper coal gas firstly contacts the spraying liquid with a lower temperature, the cooling effect is better, the temperature of the spraying liquid rises in the falling process, the cooling effect on the lower coal gas is reduced, the cooling effect of the coal gas is different in the height direction, namely, the situation that condensed water is separated out from the coal gas is different, and the overall dust removal and deacidification effect of the coal gas is influenced. The spray heads are vertically distributed and cover the flow channel of the coal gas, the sprayed water can completely cover the coal gas, and the coal gas at different heights can be sprayed and cooled by the spraying liquid with lower temperature, so that the uniform cooling of the coal gas is favorably improved, and the dedusting and deacidification effects of the coal gas are favorably improved.
Furthermore, a plurality of spray heads are distributed on two sides of the first water distributor and are respectively arranged towards the gas direction and the gas direction.
The spray heads are respectively arranged along the gas facing direction and the gas following direction so as to improve the length of a spraying path of the gas and improve the cooling effect of the gas.
Furthermore, the number of the first water distributors in the first group of spraying structures is 2-4, and each first water distributor is provided with a spray head in a distributed manner.
The coal gas flows through the first water distributors, so that multi-stage spraying cooling is realized, and the stepped uniform cooling of the coal gas is improved.
In some embodiments, the second group of spraying structures comprises at least one second water distributor and a plurality of spray heads, the second water distributor is vertically arranged, and the plurality of spray heads are arranged on the second water distributor, vertically distributed and covered on the flow channel of the coal gas.
Furthermore, a plurality of spray heads are arranged on one side of the second water distributor, and the spraying direction is towards the coal gas direction.
Because the second group of spraying structures are positioned at the lower reaches of the first group of spraying structures, the coal gas sprayed by the second group of spraying structures directly flows out from the outlet of the washing tower, and the spraying direction of the second group of spraying structures faces to the coal gas direction, so that the coal gas is cooled, and the coal gas can be prevented from carrying a large amount of liquid to flow out of the washing tower, so that the load of a subsequent adsorption bed is reduced.
In some embodiments, a condensation pipe is arranged in the spray tank, the condensation pipe is filled with cooling water, and two ends of the condensation pipe are respectively connected with the air cooling tower.
The air cooling tower cools the cooling water, the cooled cooling water circulates to the condensation pipe, and the higher-temperature spraying liquid in the spraying pool is cooled so as to regulate and control the temperature of the spraying liquid.
In some embodiments, a cold liquid storage tank is connected between the cooler and the second group of spraying structures, and the top of the cold liquid storage tank is provided with a vent valve.
The cold liquid storage tank can store the cooled spraying liquid with a lower temperature so as to ensure the continuous work of the second group of spraying structures. The top of cold liquid bin sets up atmospheric valve, can in time the evacuation with the gas that separates out in the liquid that sprays after the cooling to reduce the pressure in the cold liquid bin.
In some embodiments, each adsorption unit is provided with a loading device at the top and a discharge device at the bottom. So that the spent adsorbent in the adsorption unit is unloaded in time and fresh adsorbent is added in time.
In some embodiments, the angled passages are angled from 40 ° to 50 ° from horizontal.
In some embodiments, the sorbent is a mixture of steel slag, sintered ash, hydrated lime, and soda ash. The steel slag is used as a framework of the adsorbent, and the abundant void structure adsorbs and purifies acidic pollutants such as water, HCl and the like under the condition of ensuring a certain void; the calcined ash, slaked lime and soda ash are used to adjust the breakthrough capacity and breakthrough time and the mechanical strength of the sorbent before and after reaction.
The method for purifying and upgrading the coal gas subjected to dry dedusting TRT by desorbing moisture, removing dust, desulfurizing chlorine comprises the following steps:
conveying the gas subjected to dry dedusting TRT to a washing tower, sequentially flowing through a first group of spraying structures and a second group of spraying structures for variable-temperature spraying, so that the temperature of the gas is reduced to 35-40 ℃, and the water content is 4-5%;
the gas flowing out of the washing tower flows into an adsorption bed, and the adsorbent in the adsorption bed absorbs moisture, hydrogen chloride, sulfuric acid and CO in the gas2And (4) absorbing.
In some embodiments, the spray liquid temperature of the first set of spray structures is 45-55 ℃ and the spray liquid temperature of the second set of spray structures is 25-39 ℃.
Further, the spray liquid is industrial water, and when the circulating pH is lower than 3, the industrial water is quantitatively discharged to a plant wastewater treatment system.
In some embodiments, the particle size of the adsorbent is 50-100 μm.
The invention has the following beneficial effects:
according to the device and the process for purifying and upgrading the gas by separating moisture, removing dust, desulfurizing chlorine and upgrading the gas, the temperature-variable spraying process is adopted by virtue of the air cooling technology to realize the temperature reduction, humidification and saturation of TRT gas by dry dedusting, the absolute water content of the gas is reduced by 40-70%, water resources are recovered (the water consumption is reduced by 0.5-1.3 t/tFe), and meanwhile, the chlorine dissolving and dedusting are condensed and carried out by relying on the separation process of condensed water, so that the heat value of the clean gas is improved by 200-500 k3And the furnace temperature is 50-100 ℃, coke is saved by 4-7 kg/tFe, and the potential corrosion hazard of acid-setting liquid of subsequent pipeline equipment is effectively solved.
A fixed bed integrating the functions of moisture absorption and drying, acid and alkali neutralization and a particle bed filter is adopted for carrying out high-efficiency adsorption on moisture, residual hydrogen chloride, sulfuric acid gas, carbon dioxide and the like; the particle adsorbent is prepared from production waste and cheap raw materials, the purification cost is low, the waste utilization is realized, the coal gas is further dried, purified and upgraded, the potential corrosion hazard of acid-setting liquid of subsequent pipeline equipment is thoroughly solved, the TRT power generation operation rate is improved by 8-10%, and the particle adsorbent has wide market popularization and application prospects.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic structural diagram of a system for purifying and upgrading TRT by gas moisture separation, dust removal, desulfurization and chlorine after dry dedusting;
FIG. 2 is a schematic structural diagram of a humidifying and temperature-varying scrubber system according to an embodiment of the present invention;
FIG. 3 is a schematic view of the structure of a dust-removing desulfurization chlorine adsorbent bed according to an embodiment of the present invention.
The system comprises a gas pipeline 1, a washing tower 2, a connecting pipeline 3, an adsorption bed 4, an automatic gas locking and weighing feeding device 5, an adsorbent bin 6, a mechanical air cooling tower 7, a spray pond 8, an automatic gas locking and weighing discharging device 9, a first group of spray structures 10, a second group of spray structures 11, a first pump 12, a cold liquid storage tank 13, a low-temperature spray pump 14, an air release valve 15, a first row of inclined baffles 16, a last row of inclined baffles 17, a clean gas outlet pipeline 18 and an online monitor 19.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As shown in figure 1, the system for purifying and upgrading the TRT (TRT) after dry dedusting and gas moisture separation, dust removal and desulfurization rate comprises: a washing tower system and an adsorption bed, wherein the washing tower system comprises a washing tower 2 and a cooler;
a spraying layer is arranged above the washing tower 2, a spraying tank is arranged below the washing tower, at least two groups of spraying structures are arranged in the spraying layer and respectively comprise a first group of spraying structures 10 and a second group of spraying structures 11, the first group of spraying structures 10 are positioned at the upstream of the second group of spraying structures 11, the first group of spraying structures 10 are connected with the spraying tank 8 through a first pump 12, and the second group of spraying structures 11 are connected with the spraying tank 8 through a cooler and a second pump; the first group of spraying structures 10 comprises at least one first water distributor and a plurality of nozzles, wherein the first water distributor is vertically arranged, and the plurality of nozzles are vertically arranged on the first water distributor and cover a flow channel of coal gas. The plurality of nozzles are distributed on two sides of the first water distributor and are respectively arranged towards the gas direction and the gas direction. The spraying tank is internally provided with a partition plate which divides the inside of the spraying tank into a first area and a second area, the first area is positioned below the first group of spraying structures, the second area is positioned below the second group of spraying structures, the first pump is communicated with the first area, and the second pump is communicated with the second area.
The second group of spraying structures 11 comprises at least one second water distributor and a plurality of nozzles, the second water distributor is vertically arranged, and the nozzles are vertically arranged on the second water distributor and cover the flow channel of the coal gas.
The plurality of spray heads are arranged on one side of the second water distributor, and the spraying direction is towards the coal gas direction.
And a condensing pipe is arranged in the spray tank 8, the condensing pipe is filled with cooling water, and two ends of the condensing pipe are respectively connected with the air cooling tower.
As shown in fig. 2, a cold liquid storage tank 13 is connected between the cooler and the second group of spraying structures, and an air release valve 15 is arranged at the top of the cold liquid storage tank. The cooler can be a mechanical air cooling tower 7, and can also be in other forms of cooler structures.
As shown in fig. 3, at least two adsorption units are arranged in the adsorption bed 4 along the flow direction of the gas, each adsorption unit is filled with an adsorbent, a gas inlet and a gas outlet of each adsorption unit are provided with a row of inclined baffles, the inclined direction of each row of inclined baffles is the same, and the gas inlet or the gas outlet is divided into a plurality of inclined channels, for example, the uppermost stream of the adsorption bed 4 is a first row of inclined baffles 16, and the lowermost stream is a last row of inclined baffles 16; the top of each adsorption unit is provided with a feeding device which can be an air-locking automatic weighing feeding device 5, and the bottom of each adsorption unit is provided with a discharging device which can be an air-locking automatic weighing discharging device. So as to unload the failed adsorbent in the adsorption unit in time and add fresh adsorbent in time; the included angle between the inclined channel and the horizontal direction is 40-50 degrees.
The inclination directions of two adjacent rows of inclined baffles are mirror-symmetrical;
the inlet of the washing tower 2 is connected with a gas source through a gas pipeline 1, and the outlet of the washing tower 2 is connected with the inlet of the adsorption bed 4 through a connecting pipeline 3.
After being discharged from the top of the blast furnace, the blast furnace gas enters a bag-type dust remover for purification through primary gravity dust removal, then enters a TRT unit, after waste heat and excess pressure are released, enters a humidifying and temperature-changing washing tower 2 through a gas pipeline 1 after dry dust removal TRT, firstly contacts with a first group of spraying structures 10 in the humidifying and temperature-changing washing tower 2, and contacts with a second group of spraying structures 11 after being primarily humidified and cooled, and is further cooled and washed. Wherein the normal temperature liquid is taken from a spray tank 8 at the lower part of the humidifying and temperature changing washing tower 2, is pressurized by a first pump 12 and then is sprayed out by spray heads in a first group of spray structures 10 to be fully contacted and washed with coal gas. The low-temperature spraying liquid is taken from a spraying pool 8 at the lower part of a humidifying and temperature-changing washing tower 2, enters a mechanical air cooling tower 7 after being pressurized by a pump for ventilation and cooling, enters a cold liquid storage tank 13, is pressurized by a low-temperature circulating pump 14, enters a nozzle in a low-temperature spraying layer 14, and is further contacted with coal gas for washing, and the temperature of the coal gas is reduced to be 5-15 ℃ below the dew point. The top of the cold liquid storage tank 13 is provided with an air release valve 15, which is convenient for discharging air in time when liquid enters the storage tank.
After the coal gas is humidified and cooled by the humidifying and temperature-changing washing tower 2, condensed water is separated out, and the absolute water content of the coal gas is reduced by 40-70%. Supersaturated mechanical water carried by coal gas enters a moisture absorption, dust removal and desulfurization chlorine adsorption bed 4 through a connecting pipeline 3, is subjected to sealing and turbulent flow by a first row of inclined baffles 16 of the adsorption bed, and then is fully contacted and adsorbed with a granular adsorbent entering a first-stage adsorption bed through an adsorbent bin 6 and an air locking automatic weighing and feeding device 5, so that the mechanical water, residual hydrogen chloride, sulfuric acid gas and carbon dioxide carried by the coal gas are absorbed; then the material layer stabilizing baffles designed in mirror symmetry are used for forcibly disturbing flow, the material layer stabilizing baffles enter a lower two-stage or three-stage adsorption bed for fine treatment, and the last column of inclined baffles 17 are upwards inclined by 40-50 degrees to prevent purified gas from carrying adsorbent particles and falling into a gas conveying pipeline. The hidden trouble of corrosion of acid coagulation liquid of follow-up pipeline equipment is thoroughly solved after the gas absorbs moisture and removes chlorine, and clean gas enters downstream terminal users for high-quality utilization.
The content of impurities in the coal gas is monitored in real time by an online monitor 19 loaded on a clean coal gas outlet pipeline 18, the impurities exceed the designed content, the air-locking automatic weighing feeding device 5 and the air-locking automatic weighing discharging device 9 on the upper and lower parts of the foremost stage of adsorption bed which is started to operate simultaneously carry out adsorbent replacement, the adsorption effect is improved, the adsorption beds are always kept in a three-purpose one-standby state or a two-purpose one-standby state, and the requirements of purifying and upgrading the coal gas are met. The invalid solid adsorbent is transported by a truck and returned to a plant area steel slag, slag and other solid waste storage areas.
After the coal gas is subjected to moisture separation, dust removal, desulfurization, chlorine purification and quality improvement, the water consumption of a blast furnace system is reduced by 0.5-1.3 t/tFe, and the heat value of the clean coal gas is improved by 200-500 kJ/Nm3And the temperature of the hot blast stove is increased by 50-100 ℃, 4-7 kg/tFe of coke is saved, the potential corrosion hazard of acid-setting liquid of subsequent pipeline equipment is thoroughly solved, and the TRT power generation operating rate is increased by 8-10%.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (11)

1. The coal gas moisture-separating, dedusting and desulfurizing rate purifying and quality-improving system after dry dedusting TRT is characterized in that: the method comprises the following steps: the system comprises a washing tower system and an adsorption bed, wherein the washing tower system comprises a washing tower and a cooler;
a spraying layer is arranged above the washing tower, a spraying pool is arranged below the washing tower, at least two groups of spraying structures are arranged in the spraying layer and respectively comprise a first group of spraying structures and a second group of spraying structures, the first group of spraying structures are positioned at the upstream of the second group of spraying structures, the first group of spraying structures are connected with the spraying pool through a first pump, and the second group of spraying structures are connected with the spraying pool through a cooler and a second pump;
the first group of spraying structures comprise at least one first water distributor and a plurality of spray heads, the first water distributor is vertically arranged, the plurality of spray heads are arranged on the first water distributor, vertically distributed and covered on a flow channel of coal gas;
the second group of spraying structures comprise at least one second water distributor and a plurality of spray heads, the second water distributor is vertically arranged, and the plurality of spray heads are arranged on the second water distributor, vertically distributed and covered on a flow channel of coal gas;
at least two adsorption units are arranged in the adsorption bed along the flowing direction of the coal gas, an adsorbent is filled in each adsorption unit, a row of inclined baffles are arranged at the coal gas inlet and the coal gas outlet of each adsorption unit, the inclined directions of the inclined baffles in each row are the same, and the coal gas inlet or the coal gas outlet is divided into a plurality of inclined channels;
the inclination directions of two adjacent rows of inclined baffles are mirror-symmetrical;
the inlet of the washing tower is connected with a coal gas source, and the outlet of the washing tower is connected with the inlet of the adsorption bed;
the plurality of nozzles are distributed on two sides of the first water distributor and are respectively arranged towards the gas facing direction and the gas following direction;
the plurality of spray heads are arranged on one side of the second water distributor, and the spraying direction is towards the coal gas direction.
2. The system for purifying and upgrading the TRT (TRT) post-gas moisture-separation dust-removal desulfurization rate by the dry dedusting method according to claim 1, which is characterized in that: the spraying tank is internally provided with a partition plate which divides the inside of the spraying tank into a first area and a second area, the first area is positioned below the first group of spraying structures, the second area is positioned below the second group of spraying structures, the first pump is communicated with the first area, and the second pump is communicated with the second area.
3. The system for purifying and upgrading the TRT (TRT) post-gas moisture-separation dust-removal desulfurization rate by the dry dedusting method according to claim 1, which is characterized in that: the number of the first water distributors in the first group of spraying structures is 2-4, and each first water distributor is provided with a spray head in a distributed mode.
4. The system for purifying and upgrading the TRT (TRT) post-gas moisture-separation dust-removal desulfurization rate by the dry dedusting method according to claim 1, which is characterized in that: and a condensing pipe is arranged in the spray tank, the condensing pipe is filled with cooling water, and two ends of the condensing pipe are respectively connected with the air cooling tower.
5. The system for purifying and upgrading the TRT (TRT) post-gas moisture-separation dust-removal desulfurization rate by the dry dedusting method according to claim 1, which is characterized in that: and a cold liquid storage tank is connected between the cooler and the second group of spraying structures, and an emptying valve is arranged at the top of the cold liquid storage tank.
6. The system for purifying and upgrading the TRT (TRT) post-gas moisture-separation dust-removal desulfurization rate by the dry dedusting method according to claim 1, which is characterized in that: the included angle between the inclined channel and the horizontal direction is 40-50 degrees.
7. The method for purifying and upgrading the gas subjected to dry dedusting TRT by desorbing moisture, removing dust, removing sulfur and chlorine is characterized by comprising the following steps of: the purification and upgrading system using the gas-wet dust removal desulfurization rate after dry dedusting TRT as defined in any one of claims 1 to 6, comprises the following steps:
conveying the gas subjected to dry dedusting TRT to a washing tower, sequentially flowing through a first group of spraying structures and a second group of spraying structures for variable-temperature spraying, so that the temperature of the gas is reduced to 25-39 ℃, and the water content is 4-5%;
the gas flowing out of the washing tower flows into an adsorption bed, and the adsorbent in the adsorption bed absorbs moisture, hydrogen chloride, sulfuric acid and CO in the gas2And (4) absorbing.
8. The method for purifying and upgrading TRT (TRT) post-gas by wet separation, dust removal, desulfurization and chlorine removal according to claim 7, which is characterized in that: the temperature of the spray liquid of the first group of spray structures is 45-55 ℃, and the temperature of the spray liquid of the second group of spray structures is 25-39 ℃.
9. The method for purifying and upgrading TRT (TRT) post-gas by wet separation, dust removal, desulfurization and chlorine removal according to claim 7, which is characterized in that: the first group of spraying structures adopt silicon carbide nozzles, the atomized particle size is 500-3000 microns, and the pH value of the solution is less than or equal to 4; the pH value of the second group of spray liquid is neutral, and the atomization particle size is 100-1000 microns.
10. The method for purifying and upgrading TRT (TRT) post-gas by wet separation, dust removal, desulfurization and chlorine removal according to claim 8, which is characterized in that: the spray liquid is industrial water, and when the circulating pH is lower than 3, the industrial water is quantitatively discharged to a plant wastewater treatment system.
11. The method for purifying and upgrading TRT (TRT) post-gas by wet separation, dust removal, desulfurization and chlorine removal according to claim 7, which is characterized in that: the adsorbent is a mixture of steel slag, sintered ash, hydrated lime and soda ash.
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AT396755B (en) * 1992-07-09 1993-11-25 Oesko Gmbh METHOD FOR CLEANING A FLUE OF SMOKE USING A WASHING LIQUID
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