CN113975943A - Method and device for treating and recycling volatile organic chemical waste gas - Google Patents
Method and device for treating and recycling volatile organic chemical waste gas Download PDFInfo
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- CN113975943A CN113975943A CN202111298913.2A CN202111298913A CN113975943A CN 113975943 A CN113975943 A CN 113975943A CN 202111298913 A CN202111298913 A CN 202111298913A CN 113975943 A CN113975943 A CN 113975943A
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- 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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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
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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
- B01D53/002—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 condensation
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- 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
- B01D53/007—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 irradiation
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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
- B01D53/02—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 adsorption, e.g. preparative gas chromatography
- B01D53/06—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 adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds
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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
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- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
- F23G7/07—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases in which combustion takes place in the presence of catalytic material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
- B01D2259/804—UV light
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention discloses a method and a device for treating and recycling volatile organic chemical waste gas, belonging to the technical field of waste gas recycling and having the technical scheme key points that: the method comprises the following specific steps: s1, distilled water adsorption: A. introducing the waste gas into a distilled water adsorption tower to obtain a solution I and a waste gas I; B. introducing the first solution into a fractionating tower, and separating water from the adsorbed components; C. introducing the adsorption component into a reactor for copolymerization reaction to obtain a polymer I; s2, condensation and crystallization: introducing the waste gas I into a condensing tower, and obtaining crystals through a molecular sieve rotating wheel and a condensing chamber; s3, UV photolysis: performing UV photolysis on the waste gas III to obtain a waste gas IV; s4, catalytic combustion: introducing the exhaust gas IV into a catalytic combustion chamber for catalytic combustion; s5, gas collection and combustion: the residual gas is burned. The invention is mainly used for realizing the graded decomposition of the organic chemical waste gas, reducing the concentration of the organic chemical waste gas step by step, effectively avoiding the potential safety hazard generated in the combustion process due to overhigh concentration and recycling part of the waste gas.
Description
Technical Field
The invention relates to the technical field of waste gas recovery, in particular to a method and a device for treating and recovering volatile organic chemical waste gas.
Background
The economic development level of China is continuously improved, and various industries and various fields are rapidly developed, but the quantity of organic waste gas generated in production practice of various industries is continuously increased, the organic waste gas generated in the industries such as printing and dyeing, petrifaction and the like is particularly serious, so that not only is the industry development severely restricted, but also the atmospheric environment of China can be seriously damaged, the emission of the organic waste gas can be reduced to the maximum extent only by fully exerting the advantages of the advanced organic waste gas treatment technology, the emission of the organic waste gas is blocked, the influence of the emission of the organic waste gas on the construction of the environment-friendly society of China is avoided, the air pollution problem is really solved, and the green and long-term development of various industries is realized.
The organic waste gas mainly comprises organic compounds such as hydrocarbon compounds, benzene and benzene series, alcohols, ketones, phenols, aldehydes, esters, amines, nitriles, cyanogen and the like. Mainly comes from automobile exhaust, and is produced in the industries of electronics, chemical engineering, petrochemical engineering, coating, printing, coating, furniture, leather and the like. The organic waste gas treatment refers to the treatment work of adsorption, filtration and purification of organic waste gas generated in the industrial production process.
In production and life, due to the increase of the discharge amount of Volatile Organic Compounds (VOCs), organic waste gas treatment methods such as RTO \ RCO, adsorption, simple photolysis, low-temperature plasma and the like in the traditional VOCs treatment mode have certain defects: if secondary pollution is easy to form, regeneration is difficult, efficiency is general, potential safety hazards exist and the like, so that development of an organic waste gas treatment facility which is environment-friendly, efficient in operation and safe is urgently needed.
In order to solve the problems, a method and a device for treating and recycling volatile organic chemical waste gas are provided on the basis of the prior art.
Disclosure of Invention
The invention aims to provide a method and a device for treating and recycling volatile organic chemical waste gas, which are beneficial to realizing the graded decomposition of the organic chemical waste gas and reducing the concentration of the organic chemical waste gas step by step through the processes of adsorption, condensation crystallization, UV photolysis, catalytic combustion, gas-collecting combustion and the like, so that the potential safety hazard generated in the combustion process due to overhigh concentration of the waste gas can be effectively avoided, and the organic chemical waste gas with secondary utilization value can be recycled to a greater degree, so that the finally discharged gas is clean and environment-friendly.
The technical purpose of the invention is realized by the following technical scheme:
a method for treating and recovering volatile organic chemical waste gas comprises the following steps:
s1, distilled water adsorption:
A. introducing organic chemical waste gas into a distilled water adsorption tower by using an induced draft device for organic waste gas adsorption, wherein distilled water in the distilled water adsorption tower adsorbs water-soluble waste gas to obtain a solution I and unadsorbed waste gas I;
B. introducing the first solution into a fractionating tower, fractionating the first solution by using the fractionating tower, and separating water from the adsorption component;
C. introducing the adsorption component into a reactor for copolymerization reaction to obtain a polymer I;
s2, condensation and crystallization: introducing the waste gas I into a condensation tower, dividing the waste gas into a waste gas II and a waste gas III through a molecular sieve rotating wheel, sieving the waste gas II into a condensation chamber, and obtaining crystals through temperature control and pressure control;
s3, UV photolysis: introducing the waste gas III into a UV photolysis tower, and performing UV photolysis to obtain a waste gas IV;
s4, catalytic combustion: introducing the exhaust gas IV into a catalytic combustion chamber for catalytic combustion;
s5, gas collection and combustion: and introducing residual gases of the distilled water adsorption tower, the condensation tower and the UV photolysis tower to a catalytic combustion chamber through an air inducing device for ignition and combustion, and then discharging the purified gas through a purified gas outlet.
By adopting the technical scheme, the distilled water is used for adsorbing the water-soluble waste gas, thereby being beneficial to separating the aldol waste gas from the volatile organic chemical waste gas and realizing the treatment and recovery of the organic chemical waste gas; the water and the adsorption component are separated by utilizing the different boiling points of the water and the adsorption component, the separated adsorption component is introduced into a reactor and is subjected to copolymerization reaction in the reactor to obtain a polymer I, and the polymer I has excellent comprehensive properties such as no toxicity, high elasticity, good creep resistance, geometric stability, impact resistance, high elongation strength and fatigue resistance, can be processed and can be applied to the fields of electronics, electricity, machinery, instruments, daily light industry, automobiles, building materials, agriculture, medical technology, sports equipment and the like.
Make the waste gas in the condensing tower one through the molecular sieve runner, can carry out concentrated screening to partial waste gas, simultaneously, make the waste gas after the concentrated screening get into the condensation chamber, change the temperature through constantly adjusting pressure for partial waste gas supersaturation and precipitation crystallization helps retrieving the crystallization that has the reutilization value. And the UV photolysis is utilized to photolyze the alkene waste gas in the waste gas III, which is beneficial to reducing the concentration of the waste gas in the catalytic combustion stage and ensuring the safety of waste gas combustion to a greater extent.
Introducing the residual gas of distilled water adsorption tower, condensing tower and UV photodissociation tower to the catalytic combustion chamber through the induced air device and igniteing the burning, helping concentrating the organic chemistry waste gas of remaining in the device to the catalytic combustion chamber and burning once more to can ensure that the gas of discharging organic chemistry waste gas treatment recovery unit obtains abundant purification, can effectively avoid because of the environmental problem that exhaust-gas treatment leads to.
This scheme of adoption can be through adsorbing, the condensation crystallization, UV photodissociation, processes such as catalytic combustion and gas collection burning help realizing the hierarchical decomposition to organic chemistry waste gas, reduce the concentration of organic chemistry waste gas step by step to can effectively avoid carrying out recovery processing to the organic chemistry waste gas that has the reutilization value because of waste gas concentration is too high produced potential safety hazard in the combustion process, and, can great degree, make the clean environmental protection of final combustion gas.
The invention also provides a device for treating and recovering the volatile organic chemical waste gas, wherein the outer side wall of the distilled water adsorption tower is respectively connected with a waste gas inlet pipe and a waste gas outlet pipe, the bottom in the distilled water adsorption tower is provided with a distilled water pool, and the distilled water pool is respectively connected with a water inlet and a water outlet; the water outlet is communicated with a fractionating tower, the fractionating tower is connected with a collector, and the bottom end of the collector is connected with a reactor; distilled water adsorption tower, condensing tower, UV photodissociation tower and catalytic combustion chamber all link to each other in proper order, distilled water adsorption tower, condensing tower, UV photodissociation tower and catalytic combustion chamber all are equipped with the draught fan.
By adopting the technical scheme, the waste gas inlet pipe and the waste gas outlet pipe are utilized, so that organic chemical waste gas can conveniently enter the distilled water adsorption tower or be discharged from the distilled water adsorption tower; the distilled water tank is used, so that distilled water can be placed, and the water-soluble waste gas can be absorbed; the water inlet is utilized to help introduce distilled water into the distilled water pool; the use of a water drain to facilitate the removal of the distilled water from the distillation sump and into the fractionation column to enable the separation of water and adsorbed components in the distillation column; and the adsorption component is introduced into the collector and the reactor in sequence, which is helpful to enable the adsorption component to carry out copolymerization reaction in the reactor, so that a polymer I with excellent comprehensive performance can be obtained, and the polymer I can be widely applied to various industries after being processed.
The invention is further configured to: the condensing tower comprises a tower part, an air guide channel fixedly connected with the tower part, an air outlet channel fixedly connected with the tower part and a controller; a filter is arranged in the air guide duct, and a molecular sieve rotating wheel parallel to the horizontal plane is arranged in the middle of the inner wall of the tower part; the top inner wall of tower portion is equipped with adsorption fan, desorption fan and pre-heater, adsorption fan, desorption fan and pre-heater are located zeolite molecular sieve runner top, just desorption fan highly be higher than the height of pre-heater.
A condensing chamber is arranged at one end of the tower part close to the bottom surface of the molecular sieve rotating wheel, a miniature electric control door is arranged at the top of the condensing chamber, and a gas flowmeter is arranged between the outer bottom surface of the molecular sieve rotating wheel and the top surface of the condensing chamber; the condensing chamber is internally provided with a pressure regulator and a temperature regulator, and the miniature electric control door, the gas flowmeter, the pressure regulator and the temperature regulator are all connected with the controller.
By adopting the technical scheme, the air guide channel and the air outlet channel are utilized, so that the volatile organic chemical waste gas is favorably guided into the condensing tower and the treated waste gas is discharged out of the condensing tower; the filter is beneficial to filtering large water drops so as to smoothly realize condensation and crystallization of the ketone waste gas; the molecular sieve rotating wheel is divided into an adsorption area, a desorption area and a regeneration area, when the molecular sieve rotating wheel rotates to different areas, the adsorption, desorption and regeneration processes of waste gas are respectively executed, in the using process, the molecular sieve rotating wheel is always in a rotating state, the part of the adsorption area can rotate to the desorption area and the regeneration area and then returns to the adsorption area, and the adsorption area is reciprocated, so that the purpose of continuously adsorbing the waste gas is realized; and the waste gas enters a condensation chamber after passing through the molecular sieve rotating wheel for cooling and crystallization.
The adsorption fan is used for guiding the organic chemical waste gas entering the tower part to the molecular sieve rotating wheel; the preheater is utilized to help heat the waste gas molecules adsorbed on the molecular sieve rotating wheel, the adsorption capacity of the molecular sieve rotating wheel is changed by temperature rise, and the waste gas molecules to be desorbed are guided to the direction of the condensing chamber by the desorption fan; the gas flowmeter is used for measuring the flow of the waste gas molecules desorbed from the molecular sieve rotating wheel and determining the time point for condensation and crystallization; the miniature electric control door is beneficial to forming a closed space of the condensation chamber, is convenient for regulating and controlling temperature and pressure and is realized by the pressure regulator and the temperature regulator.
The invention is further configured to: the controller is a PLC singlechip.
Through adopting above-mentioned technical scheme, utilize the controller to be the PLC singlechip, help receiving signals and sending corresponding instruction that parts such as miniature automatically controlled door, gas flowmeter, pressure regulator and temperature regulator transmitted to can assist the smooth processing and the recovery that realize quick-witted chemistry waste gas.
The invention is further configured to: the gas flowmeter is a thermal gas mass flowmeter.
By adopting the technical scheme, the thermal gas mass flowmeter adopts the thermal diffusion principle,
excellent performance and high reliability under severe conditions.
The invention is further configured to: the molecular sieve rotating wheel is a zeolite molecular sieve rotating wheel.
By adopting the technical scheme, the molecular sieve rotating wheel is used as the zeolite molecular sieve rotating wheel, which is beneficial to efficiently realizing the screening and concentration of organic chemical waste gas molecules so as to realize the condensation and crystallization of the waste gas.
In conclusion, the invention has the following beneficial effects: through processes such as absorption, condensation crystallization, UV photodissociation, catalytic combustion and gas collection burning, help realizing the hierarchical decomposition to organic chemistry waste gas, reduce the concentration of organic chemistry waste gas step by step to can effectively avoid carrying out recovery processing to the organic chemistry waste gas that has the reutilization value because of waste gas concentration is too high produced potential safety hazard in the combustion process, and, can the great degree, make the clean environmental protection of final combustion gas.
Drawings
FIG. 1 is a flowchart of a method of example 1 of the present invention;
FIG. 2 is a schematic view of the overall configuration of an organic chemical exhaust gas treatment device according to embodiment 2 of the present invention;
FIG. 3 is a schematic view of the internal structure of a condensation column in example 2 of the present invention.
In the figure: 1. a distilled water adsorption column; 2. an exhaust gas inlet pipe; 3. an exhaust gas outlet pipe; 4. a distilled water pool; 5. a water inlet; 6. a water outlet; 7. a fractionating column; 8. a collector; 9. a reactor; 10. a condensing tower; 11. a UV photolysis tower; 12. a catalytic combustor; 13. an induced draft fan; 14. a tower portion; 15. an air guide duct; 16. an air outlet channel; 17. a controller; 18. a filter; 19. a molecular sieve rotating wheel; 20. an adsorption fan; 21. a desorption fan; 22. a preheater; 23. a condensing chamber; 24. a micro electric control door; 25. a gas flow meter; 26. a pressure regulator; 27. a temperature regulator.
Detailed Description
The invention is described in further detail below with reference to the following figures and embodiments:
example 1: a method for treating and recycling volatile organic chemical waste gas is shown in figure 1, and comprises the following specific steps:
s1, distilled water adsorption:
A. introducing organic chemical waste gas into a distilled water adsorption tower 1 by using an induced draft device for organic waste gas adsorption, adsorbing water-soluble waste gas by using distilled water in the distilled water adsorption tower 1, and obtaining a solution I with adsorbed formaldehyde and unadsorbed waste gas I;
B. introducing the first solution into a fractionating tower 7, fractionating the first solution by using the fractionating tower 7, and separating water and formaldehyde;
C. introducing the formaldehyde component obtained by fractionation into a reactor 9 for copolymerization reaction to obtain copolyoxymethylene;
s2, condensation and crystallization: introducing the waste gas I into a condensing tower 10, separating the waste gas into acetone waste gas and waste gas III through a zeolite molecular sieve rotating wheel 19, sieving the acetone waste gas into a condensing chamber 23, and obtaining acetone crystals through temperature control and pressure control;
s3, UV photolysis: introducing the waste gas III into a UV photolysis tower 11, and performing UV photolysis on partial alkene and aromatic waste gas to obtain waste gas IV;
s4, catalytic combustion: introducing the exhaust gas IV into a catalytic combustion chamber 12, and carrying out catalytic combustion by using platinum or palladium as a catalyst;
s5, gas collection and combustion: the residual gas of the distilled water adsorption tower 1, the condensation tower 10 and the UV photolysis tower 11 is introduced to the catalytic combustor 12 by an air inducing device for ignition combustion, and then the purified gas is discharged through a purified gas discharge port.
Example 2: a volatile organic chemical waste gas treatment and recovery device, as shown in fig. 2 and fig. 3, the outer side wall of a distilled water adsorption tower 1 is respectively connected with a waste gas inlet pipe 2 and a waste gas outlet pipe 3, and the waste gas inlet pipe 2 and the waste gas outlet pipe 3 are utilized to facilitate the organic chemical waste gas to enter the distilled water adsorption tower 1 or to be discharged from the distilled water adsorption tower 1; the bottom in the distilled water adsorption tower 1 is provided with a distilled water tank 4, and the distilled water tank 4 is used for facilitating the placement of distilled water and the absorption of water-soluble waste gas; the distilled water pool 4 is respectively connected with a water inlet 5 and a water outlet 6; the introduction of distilled water into the distilled water pool 4 is facilitated by the water inlet 5; the use of the water outlet 6 facilitates the removal of the distilled water from the distillation water sump 4 and introduction into the fractionation column 7 to enable separation of water and adsorbed components in the distillation column.
The water outlet 6 is communicated with a fractionating tower 7, the fractionating tower 7 is connected with a collector 8, and the bottom end of the collector 8 is connected with a reactor 9; the introduction of the adsorbed component into the collector 8 and the reactor 9 in this order helps to enable the copolymerization of the adsorbed component in the reactor 9, so that a polymer one having excellent overall properties can be obtained, which can be widely used in various industries after processing. Distilled water adsorption tower 1, condensing tower 10, UV photolysis tower 11 and catalytic combustion chamber 12 all link to each other in proper order, and distilled water adsorption tower 1, condensing tower 10, UV photolysis tower 11 and catalytic combustion chamber 12 all are equipped with draught fan 13.
The condensing tower 10 comprises a tower part 14, an air guide channel 15 fixedly connected with the tower part 14, an air outlet channel 16 fixedly connected with the tower part 14 and a controller 17; the air guide duct 15 and the air outlet duct 16 are used to help guide the volatile organic chemical waste gas into the condensing tower 10 and discharge the treated waste gas out of the condensing tower 10. A filter 18 is arranged in the air guide duct 15, and the filter 18 is utilized to be beneficial to filtering large water drops so as to smoothly realize condensation and crystallization of the ketone waste gas; a zeolite molecular sieve rotating wheel 19 parallel to the horizontal plane is arranged in the middle of the inner wall of the tower part 14; the top inner wall of tower portion 14 is equipped with adsorption fan 20, desorption fan 21 and pre-heater 22, and adsorption fan 20, desorption fan 21 and pre-heater 22 are located zeolite molecular sieve runner 19 top, and the height of desorption fan 21 is higher than the height of pre-heater 22.
The zeolite molecular sieve rotating wheel 19 is divided into an adsorption area, a desorption area and a regeneration area, when the zeolite molecular sieve rotating wheel 19 rotates to parts of different areas, the adsorption, desorption and regeneration processes of waste gas are respectively executed, in the using process, the zeolite molecular sieve rotating wheel 19 is always in a rotating state, the part of the adsorption area can rotate to the desorption area and the regeneration area and then returns to the adsorption area, and the adsorption area is reciprocated, so that the purpose of continuously adsorbing the waste gas is realized; and the waste gas enters a condensing chamber 23 after passing through a zeolite molecular sieve rotating wheel 19 for cooling and crystallization; the use of an adsorption fan 20 helps to direct the organic chemical off-gas entering the column section 14 to the zeolite molecular sieve wheel 19; the preheater 22 is used to help heat the exhaust gas molecules adsorbed on the zeolite molecular sieve rotor 19, the adsorption capacity of the zeolite molecular sieve rotor 19 is changed by the temperature rise, and the exhaust gas molecules to be desorbed are guided to the direction of the condensing chamber 23 by the desorption fan 21.
A condensing chamber 23 is arranged at one end of the tower part 14 close to the bottom surface of the zeolite molecular sieve rotating wheel 19, a miniature electric control door 24 is arranged at the top of the condensing chamber 23, and a thermal gas mass flowmeter 25 is arranged between the outer bottom surface of the zeolite molecular sieve rotating wheel 19 and the top surface of the condensing chamber 23; a pressure regulator 26 and a temperature regulator 27 are arranged in the condensing chamber 23, and the micro electric control door 24, the thermal gas mass flow meter 25, the pressure regulator 26 and the temperature regulator 27 are all connected with the PLC singlechip 17. The thermal gas mass flow meter 25 is used for measuring the flow of the exhaust gas molecules desorbed from the zeolite molecular sieve rotating wheel 19 and determining the time point for condensation and crystallization; the use of electrically controlled micro-doors 24 helps to form a closed space for the condensation chamber 23, allowing temperature and pressure regulation, and is achieved by means of pressure regulators 26 and temperature regulators 27.
In the above embodiment of the present invention, the processes of adsorption, condensation crystallization, UV photolysis, catalytic combustion, gas-collecting combustion, etc. are used to help to realize the staged decomposition of the organic chemical waste gas and to gradually reduce the concentration of the organic chemical waste gas, so as to effectively avoid the potential safety hazard generated in the combustion process due to the excessively high concentration of the waste gas, and to recycle the organic chemical waste gas having secondary utilization value to a greater extent, so that the finally discharged gas is clean and environment-friendly.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (6)
1. A method for treating and recycling volatile organic chemical waste gas is characterized by comprising the following steps:
s1, distilled water adsorption:
A. introducing organic chemical waste gas into a distilled water adsorption tower (1) by using an induced draft device for organic waste gas adsorption, wherein distilled water in the distilled water adsorption tower (1) adsorbs water-soluble waste gas, and a solution I and unadsorbed waste gas I are obtained;
B. introducing the first solution into a fractionating tower (7), and fractionating the first solution by using the fractionating tower (7) to separate water and adsorption components;
C. introducing the adsorption component into a reactor (9) for copolymerization reaction to obtain a polymer I;
s2, condensation and crystallization: introducing the waste gas I into a condensing tower (10), separating the waste gas into a waste gas II and a waste gas III through a molecular sieve rotating wheel (19), sieving the waste gas II into a condensing chamber (23), and obtaining crystals through temperature control and pressure control;
s3, UV photolysis: introducing the waste gas III into a UV photolysis tower (11), and obtaining a waste gas IV after UV photolysis;
s4, catalytic combustion: introducing the exhaust gas four into a catalytic combustion chamber (12) for catalytic combustion;
s5, gas collection and combustion: residual gas of the distilled water adsorption tower (1), the condensation tower (10) and the UV photolysis tower (11) is led to a catalytic combustion chamber (12) through an air inducing device for ignition and combustion, and then purified gas is discharged through a purified gas outlet.
2. The apparatus of claim 1, wherein the apparatus comprises: the outer side wall of the distilled water adsorption tower (1) is respectively connected with a waste gas inlet pipe (2) and a waste gas outlet pipe (3), the bottom in the distilled water adsorption tower (1) is provided with a distilled water pool (4), and the distilled water pool (4) is respectively connected with a water inlet (5) and a water outlet (6); the water outlet (6) is communicated with a fractionating tower (7), the fractionating tower (7) is connected with a collector (8), and the bottom end of the collector (8) is connected with a reactor (9); distilled water adsorption tower (1), condensing tower (10), UV photodissociation tower (11) and catalytic combustion chamber (12) all link to each other in proper order, distilled water adsorption tower (1), condensing tower (10), UV photodissociation tower (11) and catalytic combustion chamber (12) all are equipped with draught fan (13).
3. The apparatus of claim 2, wherein the apparatus comprises: the condensing tower (10) comprises a tower part (14), an air guide channel (15) fixedly connected with the tower part (14), an air outlet channel (16) fixedly connected with the tower part (14) and a controller (17); a filter (18) is arranged in the air guide duct (15), and a molecular sieve rotating wheel (19) parallel to the horizontal plane is arranged in the middle of the inner wall of the tower part (14); an adsorption fan (20), a desorption fan (21) and a preheater (22) are arranged on the inner wall of the top of the tower part (14), the adsorption fan (20), the desorption fan (21) and the preheater (22) are positioned at the top end of the molecular sieve rotating wheel (19), and the desorption fan (21) is higher than the preheater (22);
a condensing chamber (23) is arranged at one end of the tower part (14) close to the bottom surface of the molecular sieve rotating wheel (19), a miniature electric control door (24) is arranged at the top of the condensing chamber (23), and a gas flowmeter (25) is arranged between the outer bottom surface of the molecular sieve rotating wheel (19) and the top surface of the condensing chamber (23); the condensing chamber (23) is internally provided with a pressure regulator (26) and a temperature regulator (27), and the miniature electric control door (24), the gas flowmeter (25), the pressure regulator (26) and the temperature regulator (27) are all connected with the controller (17).
4. The apparatus of claim 3, wherein the apparatus comprises: the controller is a PLC singlechip.
5. The apparatus of claim 3, wherein the apparatus comprises: the gas flowmeter is a thermal gas mass flowmeter.
6. The apparatus of claim 3, wherein the apparatus comprises: the molecular sieve rotating wheel is a zeolite molecular sieve rotating wheel.
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