CN113069864A - Treatment system and process suitable for coke gas discharged by dry quenching - Google Patents
Treatment system and process suitable for coke gas discharged by dry quenching Download PDFInfo
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D50/40—Combinations of devices covered by groups B01D45/00 and B01D47/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1487—Removing organic compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B39/00—Cooling or quenching coke
- C10B39/02—Dry cooling outside the oven
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- 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
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- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
A processing system and a process suitable for coke dry quenching discharged gas comprise a bin body, a collecting main pipe, a plug-flow type folded plate dust-catching box, an absorption liquid pool and an upper spiral ridge liquid-removing pipe, wherein the bin body completely seals a coke dry quenching conveying belt, a scraper conveyor, a tail bin and a coke discharging box in an integral bin body, the bottom of the bin body is provided with an axial flow fan, the axial flow fan leads the discharged coke gas in the bin body to the collecting main pipe through a pipeline, the collecting main pipe is connected with the plug-flow type folded plate dust-catching box, a waste gas outlet of the plug-flow type folded plate dust-catching box is connected with an aeration disc at the bottom of the absorption liquid pool, and an outlet at the upper end of the absorption; tar dry slag is filled between the folded plates in the plug flow type folded plate dust collection box; VOC loading in absorption liquid poolSAn absorbent. The invention aims at the disposal mode of tar and various coke quenching waste gases in the coking, metallurgy and coal industriesThe optimization and integration are carried out, the purification effect is ensured, meanwhile, the coke powder and the circulating gas are recovered, and the device has the advantages of small investment, small occupied area, simple operation and the like.
Description
Technical Field
The invention belongs to the field of waste gas treatment, and is applied to coke dry quenching and coke discharging treatment in coking, metallurgy and coal industries; in particular to a processing system and a processing technology which are suitable for coke gas discharged by dry quenching.
Background
The coke dry quenching uses inert gas as circulating gas, exchanges heat with incandescent coke in a dry quenching furnace, and cools the coke from 1000 ℃ to below 250 ℃ to achieve the purpose of coke quenching. Most of the waste gas is organically discharged through a dedusting and desulfurizing system in the dry quenching process, and part of the unorganized discharged waste gas is discharged to the environment along with the coke discharging process from coke discharging pollution sources (coke discharging gas) such as the bottom of a coke discharging box, a coke discharging chute, a belt transfer and the like, and the main components of the part of the waste gas are coal gas, steam and a large amount of coke powder (50 g/m)3) The sulfur oxide concentration is low (< 100 mg/m) due to nitrogen encapsulation3)。
In patent No. CN108654362A, a coking exhaust gas purification system is provided, which relates to dry quenching system exhaust gas treatment. According to the scheme, the coke dry quenching waste gas is introduced into an ammonia water tank for purification, so that organic gases such as coal gas are separated, and the purified tail gas is used as supplementary nitrogen. The scheme has simple flow and simple device, but does not collect and utilize the coke powder resource. The tail gas purified by the ammonia water tank can carry a small amount of ammonia gas, so that the ammonia water is reduced, and the impurities of the make-up gas are more. The paper research on the dry quenching flue gas treatment technology, patent numbers CN210434240U and CN212440752U provide similar treatment ideas for the dry quenching waste gas treatment, and the flue gas pollution control technology is combined with the dry quenching waste gas treatment process. The mature flue gas dedusting, desulfurizing and denitrifying process can really have good treatment effect on the dry quenching exhaust gas, but the problems of investment, land occupation, operation difficulty and the like also cause that the process cannot be widely applied.
Analyzing the prior art, the defects can be collated as follows: the treatment process is weak in pertinence, most of the treatment processes are that flue gas pollution control technology is carried to dry quenching waste gas for treatment, resources in the waste gas are not effectively recovered, the exporting, purifying and utilizing processes are incomplete, and the purifying effect does not reach the standard.
Disclosure of Invention
The invention provides a treatment system and a treatment process suitable for coke dry quenching discharged coke gas, which are optimized and integrated aiming at treatment modes of coke tar in coking, metallurgy and coal industries and various coke quenching waste gases, ensure the purification effect, recover coke powder and circulating gas, and have the advantages of small investment, small occupied area, simple operation and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
a processing system suitable for coke dry quenching discharged coke gas comprises a bin body, a collecting main pipe, a plug-flow type folded plate dust-catching box, an absorption liquid pool and an upper spiral ridge liquid-removing pipe, wherein the bin body completely seals a coke dry quenching conveying belt, a scraper machine, a tail bin and a coke discharging box in an integral bin body, the bottom of the bin body is provided with an axial flow fan, the axial flow fan leads the coke gas discharged from the bin body to the collecting main pipe through a pipeline, the collecting main pipe is connected with the plug-flow type folded plate dust-catching box, a waste gas outlet of the plug-flow type folded plate dust-catching box is connected with an aeration disc at the bottom of the absorption liquid pool, and an outlet at the upper end of the absorption liquid pool is connected with; tar dry slag is filled between the folded plates in the plug flow type folded plate dust collection box; VOC loading in absorption liquid poolSAn absorbent.
The plug-flow type folded plate dust-catching box is internally provided with folded plates which are arranged in a staggered manner, one side of the inlet of the plug-flow type folded plate dust-catching box is provided with an atomizing nozzle, and the atomizing nozzle sprays VOC into the plug-flow type folded plate dust-catching boxSAnd (4) atomizing an absorbent.
The bulk density of the tar dry slag is 0.35-0.80t/m3The particle size of the tar dry slag is 10-50 mm.
The VOCSThe absorbent is prepared from the following raw materials in parts by weight: 0.1-0.5 part of sodium benzoate, 1.0-1.5 parts of cold methanol, 1.0-1.5 parts of butanediol, 0.01-0.5 part of diethylhydroxylamine, 0.01-0.5 part of polysorbate-80, 1-10 parts of solubilizer, 20-30 parts of liquid paraffin, 50-8 parts of methanol0 part of washing oil; the solubilizer is one or more of polyethylene glycol methyl ether, triethanolamine, polysiloxane-polyalkoxy ether copolymer, polyoxyethylene fatty acid ester, polyoxyethylene sorbitan monopalmitate and ethanol.
The VOCSThe preparation method of the absorbent comprises the following steps:
1) adding ethanol into a beaker, heating to 30-60 ℃ by using a water bath kettle with a stirring function, adding sodium benzoate, and continuously adding ethanol while stirring until the sodium benzoate is completely dissolved, wherein the solution is marked as a solution A;
2) fully stirring cold methanol, butanediol, diethylhydroxylamine and liquid paraffin, and adding the solution A at the speed of 0.1-3g/min while stirring to obtain a solution B, wherein the viscosity of the solution B is 2000-3000 cP;
3) and (3) stirring and heating the solution B to 60-70 ℃, adding the washing oil, adding polysorbate-80 and a solubilizer in the continuous stirring process, and finishing the preparation of the absorbent after the viscosity of the mixed solution reaches 10-50 cP.
A treatment process suitable for coke dry quenching coke discharging gas adopts a treatment system suitable for coke dry quenching coke discharging gas, and comprises the following process steps:
1) conveying coke gas in the bin body into a collecting main pipe by using an axial flow fan;
2) the coke gas in the collecting main pipe enters the plug flow type folded plate dust-catching box, and the gas sprays VOC when flowing into the plug flow type folded plate dust-catching boxSThe absorbent atomizes the liquid to lead the coke powder in the coke gas to be adhered to the tar dry slag between the folded plates, and remove the solid dust in the coke gas;
3) the tail gas after dust removal enters an absorption liquid pool for bubbling absorption and deep purification, and organic waste gas and residual dust are removed;
4) the purified gas enters an upper spiral ridge liquid removing pipe from an outlet at the top of the absorption liquid pool to remove the liquid VOC carried by the gasSAn absorbent;
5) when the gas flow velocity of the plug flow type folded plate dust-intercepting box is reduced to 5-10m/s, the mixture of the coke powder and the tar dry slag between the folded plates is taken out for solid-liquid two-phase separation.
The solid-liquid two-phase separation method of the mixture comprises the following steps: get VOCSFully stirring and diluting the absorbent and the mixture, and separating solid and liquid with a centrifuge when the viscosity is reduced to below 10-50cP to obtain VOCSAnd recovering the absorbent to an absorption liquid pool.
The axial flow fan in the step 1) is controlled by frequency conversion and interlocked with the top pressure of the bin body, so that the micro-positive pressure of 0-10Pa on the top pressure of the bin body is maintained.
Compared with the prior art, the invention has the beneficial effects that:
1) the invention applies a selective absorption adsorption purification system to treat waste gas step by step, and has ideal purification effect. The purification efficiency reaches more than 98 percent, the occupied area of the equipment is small, the corrosion is prevented, the maintenance is convenient, and the secondary pollution is not generated;
2) the plug-flow folded plate dust-catching box greatly improves the contact area of waste gas and dust-catching material. The tar dry slag is adopted as a dust-blocking material, so that common waste resources of a coking plant are recycled, and a good dust-blocking effect is achieved. The centrifugal separation absorption liquid can be recycled to the absorption liquid pool for continuous circulation, and the solids such as coke powder, dry slag and the like can be returned to the coal blending stage again to serve as fuel, carbon rod raw materials and the like;
3) the saturated capacity of the VOCs absorbent is large, the VOCs absorbent can be recycled in a certain period, and the saturated absorbent can be directly doped in tar, so that the deep processing of the tar is not influenced, and waste liquid is not generated;
4) the invention has good treatment effect on the coke gas discharged from the dry quenching, and is also suitable for similar waste gases. Through adjusting the sequence, each unit device can adapt to different kinds of tail gas treatment, the energy consumption is less, the cost is low, the pollution is less, the emission requirement is met, and the investment and the operating cost of the purifying device are reduced.
Drawings
FIG. 1 is a process schematic of the system of the present invention.
In the figure: 1-cabin body, 2-axial flow fan, 3-collecting main pipe, 4-folded plate, 5-plug flow type folded plate dust-catching box, 6-check valve, 7-aeration disc, 8-absorption liquid pool, 9-VOCSAbsorbent, 10-upper spiral ridge liquid removing pipe and 11-atomizing spray head.
Detailed Description
The invention will now be described in further detail with reference to the following examples, which are given for the purpose of illustration only and are not intended to limit the scope of the invention. The test methods used in the following examples are conventional methods unless otherwise specified, and materials, reagents and the like used in the following examples are commercially available without otherwise specified.
A processing system suitable for coke dry quenching discharged coke gas comprises a bin body 1, a collecting header pipe 3, a plug-flow type folded plate dust-intercepting box 5, an absorption liquid pool 9 and an upper spiral ridge liquid-removing pipe 10, wherein the bin body 1 completely seals a coke dry quenching conveying belt, a scraper conveyor, a tail bin and a coke discharging box in an integral bin body, the bottom of the bin body 1 is provided with an axial flow fan 2, the axial flow fan 2 leads the discharged coke gas in the bin body 1 out to the collecting header pipe 3 through a pipeline, the collecting header pipe 3 is connected with the plug-flow type folded plate dust-intercepting box 5, a waste gas outlet of the plug-flow type folded plate dust-intercepting box 5 is connected with an aeration disc 7 at the bottom of the absorption liquid pool 8, and an outlet at the upper end of the absorption liquid pool 8 is connected; tar dry slag is filled between the folded plates 4 in the plug flow type folded plate dust collection box 5; VOC loading in the absorption liquid pool 8SAn absorbent 9. The inner wall of the upper spiral ridge liquid removing pipe 10 is provided with a spiral ridge.
The plug-flow type folded plate dust-intercepting box 5 is internally provided with folded plates 4 which are arranged in a staggered manner, one side of the inlet of the plug-flow type folded plate dust-intercepting box 5 is provided with an atomizing nozzle 11, and the atomizing nozzle 11 sprays VOC into the plug-flow type folded plate dust-intercepting box 5SAnd (4) atomizing an absorbent. The distance between the folding plates 4 is 500-2000 mm.
The bulk density of the tar dry slag is 0.35-0.80t/m3The particle size of the tar dry slag is 10-50 mm.
The VOCSThe absorbent is prepared from the following raw materials in parts by weight: 0.1-0.5 part of sodium benzoate, 1.0-1.5 parts of cold methanol, 1.0-1.5 parts of butanediol, 0.01-0.5 part of diethylhydroxylamine, 0.01-0.5 part of polysorbate-80, 1-10 parts of solubilizer, 20-30 parts of liquid paraffin and 50-80 parts of washing oil; the solubilizer is one or more of polyethylene glycol methyl ether, triethanolamine, polysiloxane-polyalkoxy ether copolymer, polyoxyethylene fatty acid ester, polyoxyethylene sorbitan monopalmitate and ethanol.
The VOCSPreparation of absorbentThe preparation method comprises the following steps:
1) adding ethanol into a beaker, heating to 30-60 ℃ by using a water bath kettle with a stirring function, adding sodium benzoate, and continuously adding ethanol while stirring until the sodium benzoate is completely dissolved, wherein the solution is marked as a solution A;
2) fully stirring cold methanol, butanediol, diethylhydroxylamine and liquid paraffin, and adding the solution A at the speed of 0.1-3g/min while stirring to obtain a solution B, wherein the viscosity of the solution B is 2000-3000 cP;
3) heating the solution B to 60-70 deg.C under stirring, adding washing oil, adding polysorbate-80 and solubilizer under stirring, and adding VOC after the viscosity of the mixture reaches 10-50cPSThe absorbent preparation is completed.
A treatment process suitable for coke dry quenching coke discharging gas adopts a treatment system suitable for coke dry quenching coke discharging gas, and comprises the following process steps:
1) conveying the coke gas in the bin body 1 into a collecting main pipe 3 by using an axial flow fan 2;
2) the coke gas in the collecting main pipe 3 enters the plug flow type folded plate dust-catching box 5, and the gas sprays VOC when flowing into the plug flow type folded plate dust-catching box 5SThe absorbent atomizes the liquid to lead the coke powder in the coke gas to be adhered to the tar dry slag between the folded plates 4, and remove the solid dust in the coke gas;
3) the tail gas after dust removal enters an absorption liquid pool 8 for bubbling absorption and deep purification to remove organic waste gas and residual dust;
4) the purified gas enters the upper spiral ridge liquid removing pipe 10 from the outlet at the top of the absorption liquid pool to remove the liquid VOC carried by the gasSAn absorbent;
5) when the gas flow velocity of the plug flow type folded plate dust-intercepting box 5 is reduced to 5-10m/s, the mixture of the coke powder and the tar dry slag between the folded plates 4 is taken out for solid-liquid two-phase separation.
The solid-liquid two-phase separation method of the mixture comprises the following steps: the mixture mainly comprises coke powder, dry residue and VOCSAbsorbing liquid, taking VOCSFully stirring and diluting the absorbent and the mixture, and separating solid and liquid with a centrifuge when the viscosity is reduced to below 10-50cP to obtain VOCSThe absorbent is recovered to the absorption liquid pool 8. Coke powder, driedThe solid such as slag can be returned to the coal blending stage again to be used as fuel, carbon rods and the like.
The axial flow fan 2 in the step 1) adopts variable frequency control, is interlocked with the top pressure of the bin body 1, and keeps the micro-positive pressure of 0-10Pa on the top pressure of the bin body 1. To ensure that the pressure in the furnace is not affected.
Example 1:
a treatment process suitable for coke dry quenching coke discharging gas is specifically implemented as follows:
the conveyor belt, the scraper conveyor, the tail bin and the coke discharging box are all sealed into an integral bin body 1. Axial flow fans 2 are arranged around the bottom of the bin body 1, and the fans send waste gas into a waste gas collecting main pipe 3. The waste gas collecting main pipe 3 is connected with a plug-flow type folded plate dust-catching box 5, a plurality of layers of folded plates 4 are arranged in the plug-flow type folded plate dust-catching box 5, the distance between the folded plates is 1000mm, the folded plates 4 are fully filled with tar dry slag, and the gas jets VOC when flowing into the plug-flow type folded plate dust-catching box 5SThe absorbent atomizes the liquid to cause the coke powder to adhere to the dry slag. When the gas flow rate is reduced to 8m/s, the mixture is taken out, and the solid phase and the liquid phase are separated. And the tail gas after dust removal enters an absorption liquid pool 8 for bubbling absorption and deep purification to remove organic waste gas and residual dust.
The flow diverter and the axial flow fan are controlled by frequency conversion and interlocked with the top pressure of the bin body 1 to keep the micro positive pressure of 0-10Pa on the top of the bin body 1 so as to ensure that the pressure in the furnace is not influenced.
The bulk density of the tar dry slag is 0.45t/m3The particle size of the dry slag is 50mm, and the bulk density is 480kg/m3；
The mixture mainly comprises coke powder, dry residue and VOCSAbsorbing the liquid. Taking a proper amount of VOCSThe absorption liquid and the mixture are fully stirred and diluted, and when the viscosity is reduced to be below 10cP, the mixture is put into a centrifuge to separate solid from liquid. VOCSThe absorption liquid can be recycled to the absorption tank 8, and the solids such as coke powder, dry slag and the like can be returned to the coal blending stage again to serve as fuel, carbon rod raw materials and the like;
the absorption liquid tank 8 is a bubbling type absorption, wherein waste gas enters from a non-return aeration disc 7 at the lower part of the tank body and is discharged from the top after purification.
VOCSThe absorbent is a high-efficiency ring suitable for disposing VOCs in a coking plantThe absorbent comprises, per 100g, 0.1g of sodium benzoate, 1.0g of cold methanol, 1.0g of butanediol, 0.02g of diethylhydroxylamine, 0.3g of polysorbate-80, 8g of solubilizer, 20g of liquid paraffin, and the balance of wash oil. The solubilizer is one or more of polyethylene glycol methyl ether, triethanolamine, polysiloxane-polyalkoxy ether copolymer, polyoxyethylene fatty acid, polyoxyethylene sorbitan monopalmitate and ethanol;
high-efficiency environment-friendly VOCSThe absorbent is prepared by the following steps:
1) adding a proper amount of ethanol into a beaker, heating the beaker to 45 ℃ by using a water bath kettle with a stirring function, adding sodium benzoate after the temperature is stable, stirring, and continuously adding ethanol in the stirring and heating process to ensure that the sodium benzoate is dissolved. Denoted as solution A.
2) After cold methanol, butanediol, diethylhydroxylamine and liquid paraffin were sufficiently stirred, the solution A was added at a rate of 0.5g/min under stirring to obtain a solution B. Solution B viscosity reached 2670cP at this point.
3) And (3) stirring and heating the solution B to 60 ℃, adding the washing oil, and adding a proper amount of polysorbate-80 and a solubilizer in the process of continuous stirring. VOC is generated after the viscosity of the mixed liquid reaches 15cPSThe absorbent preparation is completed.
The treatment system and the treatment process suitable for the coke dry quenching coke discharging gas provided by the invention are guided by absorption-adsorption, inertial collision and trapping principles, and can be used for efficiently treating the coke dry quenching coke discharging gas in the coking, metallurgy and coal industries. The process is simple and reasonable, the treatment efficiency is high, the investment and operation cost is low, and the energy consumption and treatment effect are superior to those of the common technologies such as a direct burning method; the operation difficulty is low, and the automatic control is easy to realize.
Claims (8)
1. The processing system is characterized by comprising a bin body, a collecting header pipe, a plug-flow type folded plate dust collection box, an absorption liquid pool and an upper spiral ridge liquid removal pipe, wherein the bin body completely seals a dry quenching conveying belt, a scraper conveyor, a tail bin and a coke discharge box in an integral bin body, the bottom of the bin body is provided with an axial flow fan, and the axial flow fan is used for discharging coke in the bin body through a pipelineThe coke gas is led out to a collecting main pipe, the collecting main pipe is connected with a plug flow type folded plate dust-intercepting box, a waste gas outlet of the plug flow type folded plate dust-intercepting box is connected with an aeration disc at the bottom of an absorption liquid pool, and an outlet at the upper end of the absorption liquid pool is connected with an inlet at the bottom of a spinning spine liquid-removing pipe; tar dry slag is filled between the folded plates in the plug flow type folded plate dust collection box; VOC loading in absorption liquid poolSAn absorbent.
2. The system of claim 1, wherein the push flap dust bin has alternating flaps, and the push flap dust bin has an atomizing nozzle on the inlet side for spraying VOC into the push flap dust binSAnd (4) atomizing an absorbent.
3. The system for treating coke dry quenching coke discharging gas as claimed in claim 1 or 2, wherein the bulk density of the tar dry slag is 0.35-0.80t/m3The particle size of the tar dry slag is 10-50 mm.
4. The system of claim 1, wherein the VOC is a Volatile Organic Compound (VOC) suitable for use in dry quenching coke gasSThe absorbent is prepared from the following raw materials in parts by weight: 0.1-0.5 part of sodium benzoate, 1.0-1.5 parts of cold methanol, 1.0-1.5 parts of butanediol, 0.01-0.5 part of diethylhydroxylamine, 0.01-0.5 part of polysorbate-80, 1-10 parts of solubilizer, 20-30 parts of liquid paraffin and 50-80 parts of washing oil; the solubilizer is one or more of polyethylene glycol methyl ether, triethanolamine, polysiloxane-polyalkoxy ether copolymer, polyoxyethylene fatty acid ester, polyoxyethylene sorbitan monopalmitate and ethanol.
5. The system of claim 4, wherein the VOCs are present in the coke dry quenching effluent gasSThe preparation method of the absorbent comprises the following steps:
1) adding ethanol into a beaker, heating to 30-60 ℃ by using a water bath kettle with a stirring function, adding sodium benzoate, and continuously adding ethanol while stirring until the sodium benzoate is completely dissolved, wherein the solution is marked as a solution A;
2) fully stirring cold methanol, butanediol, diethylhydroxylamine and liquid paraffin, and adding the solution A at the speed of 0.1-3g/min while stirring to obtain a solution B, wherein the viscosity of the solution B is 2000-3000 cP;
3) heating the solution B to 60-70 deg.C under stirring, adding washing oil, adding polysorbate-80 and solubilizer under stirring, and adding VOC after the viscosity of the mixture reaches 10-50cPSThe absorbent preparation is completed.
6. A process for treating coke dry quenching coke discharging gas, which is characterized in that the process adopts the treatment system suitable for coke dry quenching coke discharging gas as claimed in claim 1, and the process comprises the following steps:
1) conveying coke gas in the bin body into a collecting main pipe by using an axial flow fan;
2) the coke gas in the collecting main pipe enters the plug flow type folded plate dust-catching box, and the gas sprays VOC when flowing into the plug flow type folded plate dust-catching boxSThe absorbent atomizes the liquid to lead the coke powder in the coke gas to be adhered to the tar dry slag between the folded plates, and remove the solid dust in the coke gas;
3) the tail gas after dust removal enters an absorption liquid pool for bubbling absorption and deep purification, and organic waste gas and residual dust are removed;
4) the purified gas enters an upper spiral ridge liquid removing pipe from an outlet at the top of the absorption liquid pool to remove the liquid VOC carried by the gasSAn absorbent;
5) when the flow velocity of the plug flow type folded plate dust collection box is reduced to 5-10m/s, the mixture of the coke powder and the tar dry slag between the folded plates is taken out for solid-liquid two-phase separation.
7. The process of claim 6, wherein the solid-liquid two-phase separation of the mixture comprises: get VOCSFully stirring and diluting the absorbent and the mixture, and separating solid and liquid with a centrifuge when the viscosity is reduced to below 10-50cP to obtain VOCSAnd recovering the absorbent to an absorption liquid pool.
8. The process for treating coke dry quenching coke discharging gas as claimed in claim 6, wherein the axial flow fan in the step 1) is controlled by frequency conversion and interlocked with the top pressure of the bin body to maintain the micro positive pressure of the top pressure of the bin body at 0-10 Pa.
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