CN116672842A - Treatment method and control system for waste gas - Google Patents
Treatment method and control system for waste gas Download PDFInfo
- Publication number
- CN116672842A CN116672842A CN202310421857.XA CN202310421857A CN116672842A CN 116672842 A CN116672842 A CN 116672842A CN 202310421857 A CN202310421857 A CN 202310421857A CN 116672842 A CN116672842 A CN 116672842A
- Authority
- CN
- China
- Prior art keywords
- waste gas
- gas
- catalytic oxidation
- temperature
- washing tower
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000002912 waste gas Substances 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000007789 gas Substances 0.000 claims abstract description 69
- 229910021536 Zeolite Inorganic materials 0.000 claims abstract description 33
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000010457 zeolite Substances 0.000 claims abstract description 33
- 238000005406 washing Methods 0.000 claims abstract description 28
- 239000010815 organic waste Substances 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000001914 filtration Methods 0.000 claims abstract description 16
- 239000007921 spray Substances 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 12
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 9
- 239000002585 base Substances 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 239000003513 alkali Substances 0.000 claims abstract description 4
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 3
- 230000003472 neutralizing effect Effects 0.000 claims abstract description 3
- 230000003197 catalytic effect Effects 0.000 claims description 49
- 230000003647 oxidation Effects 0.000 claims description 42
- 238000007254 oxidation reaction Methods 0.000 claims description 42
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 24
- 238000004321 preservation Methods 0.000 claims description 15
- 238000001179 sorption measurement Methods 0.000 claims description 14
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 12
- 230000000694 effects Effects 0.000 claims description 11
- 239000000428 dust Substances 0.000 claims description 10
- 239000001569 carbon dioxide Substances 0.000 claims description 9
- 239000003054 catalyst Substances 0.000 claims description 9
- 238000003795 desorption Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 8
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 claims description 8
- 238000009530 blood pressure measurement Methods 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 6
- 229920000742 Cotton Polymers 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 6
- 239000000835 fiber Substances 0.000 claims description 6
- 239000003546 flue gas Substances 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 6
- 238000000746 purification Methods 0.000 claims description 6
- 238000007084 catalytic combustion reaction Methods 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910000510 noble metal Inorganic materials 0.000 claims description 4
- 231100000572 poisoning Toxicity 0.000 claims description 4
- 230000000607 poisoning effect Effects 0.000 claims description 4
- 239000012855 volatile organic compound Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000006555 catalytic reaction Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000000084 colloidal system Substances 0.000 claims description 3
- 238000010924 continuous production Methods 0.000 claims description 3
- 238000004880 explosion Methods 0.000 claims description 3
- 238000002203 pretreatment Methods 0.000 claims description 3
- 230000002265 prevention Effects 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- 206010053615 Thermal burn Diseases 0.000 claims description 2
- 238000005485 electric heating Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 239000010865 sewage Substances 0.000 claims description 2
- 238000004886 process control Methods 0.000 claims 3
- 239000000126 substance Substances 0.000 abstract description 2
- 238000009835 boiling Methods 0.000 abstract 1
- 239000003344 environmental pollutant Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000003915 air pollution Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000013618 particulate matter Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/60—Combinations of devices covered by groups B01D46/00 and B01D47/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0002—Casings; Housings; Frame constructions
- B01D46/0012—In-line filters
-
- 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
- B01D53/04—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 stationary adsorbents
-
- 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
- B01D53/26—Drying gases or vapours
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/38—Removing components of undefined structure
- B01D53/44—Organic components
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/3491—Regenerating or reactivating by pressure treatment
-
- 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
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention relates to the technical field of waste gas treatment, in particular to a treatment method and a control system for waste gas, which comprises a spray washing tower, wherein the spray washing tower is used for purifying waste gas by adopting alkali liquor such as sodium hydroxide and the like which is easy to dissolve in water or high in boiling point according to an acid-base neutralization reaction principle, the acid-base waste gas is led out from an air pipe and enters the waste gas washing tower, a filter material tower and water spray are arranged in the washing tower, and a circulating water pump is arranged outside the washing tower; upward flowing to the filter material layer to contact and react with the neutralizing liquid sprayed out by the nozzle; the invention can establish a relatively finished treatment method of the filtering and impurity removing structure through the arrangement of the dry type filtering and filtering box, the spray washing tower and the demister, thereby achieving the purposes of absorbing and removing particulate matters and organic components of the organic waste gas, reducing and dissolving the concentration of the organic waste gas, desorbing the VO component of chemical components contained in the organic waste gas in zeolite through the zeolite fixed bed, and achieving the aim of purifying the organic waste gas and achieving the standard of standard emission of the organic waste gas.
Description
Technical Field
The invention relates to the technical field of image recognition, in particular to a treatment method and a control system for waste gas.
Background
According to workshop technological process and equipment actual conditions, the waste gas (dust) collecting scheme is provided, the workshop is guaranteed to be free of peculiar smell and dust and is diffused, the waste gas (dust) is treated according to the waste gas (dust) collecting condition, the waste gas is guaranteed to be safely discharged up to standard, and the workshop clean and safe production is realized.
The method for treating the organic waste gas is characterized in that the organic waste gas is decomposed into carbon dioxide and water in an incineration mode to enable the carbon dioxide and the water to reach emission standards, the influence on human bodies or the environment is avoided, although the incineration can generate heat energy through waste gas combustion and generate new solid substances, the waste gas is discharged after the filtration treatment, more pollutants are still contained, the air pollution is caused, the health of workers is threatened, and the method aims to collect and treat the waste gas in an unorganized and organized manner in the workshop part according to the technical route of collection, alkali washing, adsorption concentration and catalytic oxidation, so that the emission standards of relevant environmental protection regulations in China and places are met, and the pollution of the waste gas to the environment and station operating environment is furthest lightened by organic waste gas high-efficiency treatment equipment.
Therefore, a method and a control system for treating waste gas are needed to solve the problem in the prior art that the organic waste gas is discharged after only being filtered during treatment, and the organic waste gas still contains more pollutants, so that the air pollution purifying effect is poor.
Disclosure of Invention
The present invention is directed to a method and a control system for treating exhaust gas, which solve the above-mentioned drawbacks of the prior art.
The technical scheme adopted by the invention is as follows:
provided are a treatment method and a control system for exhaust gas, comprising the steps of:
s1, conveying and extracting organic waste gas generated in a workshop through an induced draft fan to perform induced draft operation, and collecting and conveying the waste gas under the action of a pipeline;
s2, organic waste gas conveyed through a pipeline enters a corresponding dry pre-filtering box, a coarse filter is arranged in the dry pre-filtering box, a spray washing tower is added for treatment after dry pre-treatment, a demister is added after the washing tower, and liquid water in the waste gas is effectively removed;
s3, enabling the filtered waste gas to enter a 1-set zeolite fixed bed for adsorption purification, wherein VOCs components are adsorbed in zeolite;
s4, according to the fact that the gas desorbed by the zeolite fixed bed enters a catalytic oxidation furnace for catalysis under the action of a desorption fan, the desorbed gas forms high-concentration organic gas which is decomposed through catalytic oxidation to form carbon dioxide and water, and the carbon dioxide and water reach the emission standard;
s5, the gas subjected to catalytic oxidation is subjected to adsorption again, secondary filtering operation is carried out on the gas, and then the gas reaching the standard is discharged.
As a preferred technical scheme of the invention: the coarse effect filter removes impurities such as particulate matters and colloid in waste gas, the spray tower can further remove dust to the particulate matters, meanwhile, partial organic components with better water solubility can be absorbed, the concentration of waste gas is reduced, the purification efficiency and the service life of a zeolite adsorption bed are guaranteed, the demister mainly comprises a first stage which is a wire mesh demister, a condensing device is additionally arranged at the bottom of the first stage, the demisting efficiency of fog drops with the particle size of more than 3 mu m can reach more than 98%, and a F9-level filter is arranged at the second stage, so that dust entering the zeolite adsorption bed is guaranteed to meet the requirements.
As a preferred technical scheme of the invention: the spray washing tower is used for purifying waste gas by adopting alkali solution such as sodium hydroxide and the like according to an acid-base neutralization reaction principle, wherein the acid-base waste gas is led out from an air pipe and enters the waste gas washing tower, a filter material tower and water spray are arranged in the washing tower, and a circulating water pump is arranged outside the washing tower; and the washing liquid flows upwards to a filter material layer to be in contact reaction with the neutralizing liquid sprayed out of the nozzle, the washing liquid flowing down from the tower is lifted to the top of the tower through a circulating water pump and is continuously recycled, and the washing liquid is discharged to a sewage treatment station after reaching a certain concentration.
As a preferred technical scheme of the invention: the zeolite fixed bed is made of Q235 steel plates, and the outer layer of the zeolite fixed bed is provided with heat insulation, scald prevention and heat loss reduction effects, and the size is determined according to the field conditions.
As a preferred technical scheme of the invention: the catalytic furnace adopts negative pressure desorption, one end of the oxidation catalytic furnace is connected with a high-efficiency plate heat exchanger, heat exchange is carried out with combusted waste flue gas through the high-efficiency plate heat exchanger, heat is recovered, hot gas at about 250 ℃ is obtained, the hot gas is introduced into a zeolite fixed bed to be desorbed, one end of the catalytic oxidation furnace is connected with an electric heater, desorption waste gas enters the catalytic oxidation furnace to be catalytically combusted after being heated by a burner or electric heating, the temperature is 280 ℃ after being started, the normal working condition is 350-450 ℃, the maximum temperature is 650 ℃, the waste gas component is decomposed into CO2 and H2O, and the temperature of the flue gas is increased.
As a preferred technical scheme of the invention: the catalytic oxidation furnace is characterized in that a high-aluminum silicate fiber heat preservation module is adopted in the box body of the catalytic oxidation furnace, the maximum heat preservation thickness is about 250mm, the heat preservation effect is superior to that of common aluminum or high-purity fiber cotton, after heat preservation, the contact part of the box body and a gas medium in the equipment is isolated by high-performance heat preservation cotton, the temperature resistance is 1200-1300 ℃, the temperature of the outer surface of the box body is less than 80 ℃, and a warning mark is arranged on the high-temperature part.
As a preferred technical scheme of the invention: the catalytic oxidation furnace adopts a high-performance poisoning-resistant noble metal type catalyst, the ignition temperature is only 280 ℃, the catalytic activity is high, the service life is long, the airspeed is high (12,000 h-1), the pressure loss is small, the use amount is small, and the occupied area of equipment is reduced.
As a preferred technical scheme of the invention: the system comprises a PLC automatic control system, wherein the operation state of key equipment units, the temperature and the pressure of key points are monitored, and the automatic record is carried out, so that the operation condition of equipment is conveniently evaluated; reserving a DCS interface to a central control room, and adapting to the operation requirements of intermittent and continuous production modes;
the temperature measuring module monitors the temperature generated by the waste gas during treatment and ensures that the temperature of the waste gas during treatment is within a normal range value;
the pressure measuring module is used for carrying out pressure relief and pressurization treatment on the inside of the equipment according to the pressure value generated when the waste gas is treated and the pipeline is carried out, so that the pressure in the equipment is ensured to be normal;
the fan control module is used for controlling the frequency of the fan according to the change of the air quantity and the measured pressure change of the pipeline, changing the air quantity of the fan, saving energy and reducing consumption and ensuring the stability of a production line in a user range;
and the power supply control module is used for carrying out safety protection devices such as power failure protection, overload protection, line fault protection, misoperation and the like on the whole power supply circuit according to the running state of the equipment, all the electric equipment is reliably grounded, the safety of the system in a special state is ensured, and the insulation resistance of an electric appliance loop is not less than 24 megaohms at the relative humidity of 80 percent.
As a preferred technical scheme of the invention: the pressure measurement module is including setting up in the inside forced blowing procedure setting of driving of catalytic oxidation stove, and forced blowing time is not less than 5min to guarantee that furnace and pipeline do not have any residual waste gas, catalytic oxidation stove's top and pipeline outside all are provided with the rupture disk, prevent that organic waste gas concentration from being too high, appear explosion danger, through the mode of pressure release, ensure safety.
As a preferred technical scheme of the invention: one end of the power supply control module is connected with an LEL on-line detection unit, the concentration of the control waste gas entering the catalytic combustion is less than 25% LEL, a secondary alarm point is set, the primary alarm point is 15% LEL, the secondary alarm point is 20% LEL, the primary alarm point is reached to prompt the system to check, when the secondary alarm point is reached, the fresh air valve is opened through linkage control, when the alarm lasts for 20 seconds, the system is stopped in an emergency, and the on-line detection unit is connected with the pressure measurement module.
Compared with the prior art, the treatment method and the control system for the waste gas have the beneficial effects that:
the invention establishes a relatively finished treatment method of a filtering and impurity removing structure through the arrangement of the dry type filtering and filtering box, the spray washing tower and the demister, achieves the purposes of absorbing and removing particulate matters and organic components of organic waste gas, reducing and dissolving the concentration of the organic waste gas, desorbing VO components which are contained in the organic waste gas in zeolite through a zeolite fixed bed, achieving the aim of purifying the organic waste gas, achieving the standard of standard discharge of the organic waste gas, and enabling high-concentration waste gas after the desorption of the zeolite fixed bed to enter a catalytic oxidation furnace for catalytic oxidation, wherein the organic gas is decomposed through catalytic oxidation to form carbon dioxide and water, and the standard discharge can be achieved, and meanwhile, the heat generated by the catalytic oxidation can reduce the auxiliary fuel consumption of a system.
Drawings
FIG. 1 is a flow chart of a method of a preferred embodiment of the present invention;
FIG. 2 is a system flow diagram of a preferred embodiment of the present invention;
FIG. 3 is a process diagram of a method in a preferred embodiment of the invention.
Detailed Description
It should be noted that, under the condition of no conflict, the embodiments of the present embodiments and features in the embodiments may be combined with each other, and the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and obviously, the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-3, a preferred embodiment of the present invention provides a treatment method and control system for exhaust gas, comprising the steps of:
s1, conveying and extracting organic waste gas generated in a workshop through an induced draft fan to perform induced draft operation, and collecting and conveying the waste gas under the action of a pipeline;
s2, organic waste gas conveyed through a pipeline enters a corresponding dry pre-filtering box, a coarse filter is arranged in the dry pre-filtering box, a spray washing tower is added for treatment after dry pre-treatment, a demister is added after the washing tower, and liquid water in the waste gas is effectively removed;
s3, enabling the filtered waste gas to enter a 1-set zeolite fixed bed for adsorption purification, wherein VOCs components are adsorbed in zeolite;
s4, according to the fact that the gas desorbed by the zeolite fixed bed enters a catalytic oxidation furnace for catalysis under the action of a desorption fan, the desorbed gas forms high-concentration organic gas which is decomposed through catalytic oxidation to form carbon dioxide and water, and the carbon dioxide and water reach the emission standard;
s5, the gas subjected to catalytic oxidation is subjected to adsorption again, secondary filtering operation is carried out on the gas, and then the gas reaching the standard is discharged.
In this embodiment, coarse effect filter gets rid of impurity such as particulate matter, colloid in the waste gas, it can further carry out dust removal treatment to the particulate matter to cross the spray column, can absorb the better organic component of partial water solubility simultaneously, reduces waste gas concentration, guarantees the purification efficiency and the life-span of zeolite adsorption bed, defroster mainly structure is first level and is wire mesh defroster, and first level bottom increases and arranges the congealing device, to the fog droplet more than 3 mu m, and its defogging removal efficiency can reach more than 98%, and the second level sets up the filter of F9 level, guarantees that the dust that gets into the zeolite fixed bed satisfies the requirement, carries the transmission to gas through the adsorption fan.
The zeolite fixed bed is made of Q235 steel plates, the zeolite fixed bed is provided with heat insulation on the outer layer, scalding prevention and heat loss reduction effects, the size and the size are determined according to the site conditions, and the size of the zeolite aperture are tidy and uniform, so that when the solid surface is contacted with gas, VOCs gas molecules can be adsorbed, concentrated and kept on the solid surface, pollutants are adsorbed, a large amount of adsorbents are adsorbed after the zeolite is used for a period of time, the zeolite gradually tends to be saturated, the working capacity gradually decays, and the filter layer is penetrated when the working capacity is seriously, and the zeolite is regenerated or replaced at the moment.
One end of the oxidation catalytic furnace is connected with a high-efficiency plate heat exchanger, heat exchange is carried out with combusted waste flue gas through the high-efficiency plate heat exchanger, heat is recovered, hot gas at about 250 ℃ is obtained, the hot gas is introduced into a zeolite fixed bed to desorb the hot gas, one end of the catalytic oxidation furnace is connected with an electric heater, desorbed waste gas enters the catalytic oxidation furnace to be catalytically combusted after being heated by a burner or electric heater, the temperature of the waste gas is 280 ℃ after being raised, the normal working condition is 350-450 ℃, the maximum temperature of the waste gas is 650 ℃, the waste gas component is decomposed into CO2 and H2O, and the temperature of the flue gas is raised.
The catalytic oxidation furnace is characterized in that a high-aluminum silicate fiber heat preservation module is adopted in the box body of the catalytic oxidation furnace, the maximum heat preservation thickness is about 250mm, the heat preservation effect is superior to that of common aluminum or high-purity fiber cotton, after heat preservation, the contact part of the box body and a gas medium in the equipment is isolated by the high-performance heat preservation cotton, the temperature resistance is 1200-1300 ℃, the temperature of the outer surface of the box body is less than 80 ℃, a warning mark is arranged at the high-temperature part, a butterfly valve is adopted in the catalytic oxidation furnace system, a butterfly plate can be separated from a valve seat immediately after the valve is opened, unnecessary excessive extrusion and scraping phenomena of the butterfly plate and the valve seat are eliminated greatly, the opening resistance is reduced, the abrasion is reduced, the service life of the valve seat is prolonged, the filter flame arrester is arranged through the connection pipeline of the catalytic oxidation furnace, the unexpected occurrence is prevented, the flame is prevented from spreading to a customer production line, and the warning mark is arranged at the high temperature or rotating equipment parts of all equipment, and the personal safety of operators is ensured.
The catalytic oxidation furnace adopts a high-performance poisoning-resistant noble metal type catalyst, the ignition temperature is only 280 ℃, the catalytic activity is high, the service life is long, the airspeed is high (12,000 h-1), the pressure loss is small, the use amount is small, the occupied space size of equipment is reduced, in order to prevent corrosion, the main characteristics of the poisoning-resistant noble metal type catalyst are that the main body, the pipeline, the accessories, the supporting hanger and the platform staircase of the catalytic oxidation furnace are sprayed with paint:
(1) The catalytic removal efficiency is high (more than 98 percent@1g and m), the reaction activation energy is obviously reduced, and the catalyst is operated at medium and low temperatures; the heat resistance is good, the heat shock resistance is strong, and the maximum working temperature is about 700 ℃;
(2) High space velocity (12000-15000 h-1), space velocity being more than 2-3 times of that of common catalyst, low pressure loss, compact structure of catalytic bed, and low operation and maintenance cost;
(3) The catalyst uses alumina carrier stabilized at high temperature to ensure that the catalyst is not sintered, and the specific surface area, mechanical strength and thermal stability of the catalyst with high activity are maintained.
The system comprises a PLC automatic control system, wherein the operation state of key equipment units, the temperature and the pressure of key points are monitored, and the automatic record is carried out, so that the operation condition of equipment is conveniently evaluated; the DCS interface is reserved to a central control room, so that the control system is suitable for operation requirements of intermittent and continuous production modes, the control system is provided with a gas-break protection measure when detecting catalytic oxidation points, and a selected single-acting actuator can ensure that a fresh air valve is in an open state and an emergency evacuation valve is in an open state under a gas-break state, so that the safety of the system is ensured; the exhaust valve of the air outlet equipment is automatically opened even under the condition of power failure, and waste gas enters the catalytic combustion valve to be automatically closed;
the temperature measuring module monitors the temperature generated by the waste gas during treatment and ensures that the temperature of the waste gas during treatment is within a normal range value;
the pressure measuring module is used for carrying out pressure relief and pressurization treatment on the inside of the equipment according to the pressure value generated when the waste gas is treated and the pipeline is carried out, so that the pressure in the equipment is ensured to be normal;
the fan control module is used for controlling the frequency of the fan according to the change of the air quantity and the measured pressure change of the pipeline, changing the air quantity of the fan, saving energy and reducing consumption and ensuring the stability of a production line in a user range; in the system, all fans of the system adopt a fireproof design such as a copper sheet inlaid at a suction inlet or a cast aluminum impeller and the like, the safety of equipment of the system in flammable and explosive environments is enhanced, each fan motor is provided with a low-voltage circuit breaker with overload protection, and a feedback contact is fed into a PLC (programmable logic controller) to perform phase protection and cut-off control on the motors. All fans are operated, signals such as faults are displayed in real time, audible and visual alarms are given out when faults occur, the waste gas fans are adjusted in a variable frequency mode and are linked with waste gas pressure, waste gas emission of a production line of an owner is smooth, normal production is guaranteed, meanwhile, the adsorption fans and the desorption fans are all configured in a variable frequency mode through VFD, parts of non-variable frequency motors are not adopted in the system, and 2-level energy efficiency identification products are adopted.
The power control module is used for carrying out safety protection devices such as power failure protection, overload protection, line fault protection, misoperation and the like on the whole power circuit according to the running state of the equipment, all the electric equipment is reliably grounded, the safety of the system in a special state is ensured, and the insulation resistance of an electric appliance loop is not less than 24 megaohms at the relative humidity of 80%; by charging the devices involved in the present system:
(1) The electrified body is sealed by adopting a non-conductive insulating material, or isolated by adopting a shielding, a protecting cover and the like, and the electric equipment is arranged according to an electric safety clearance to prevent the electric equipment from contacting or approaching the electrified body;
(2) And (3) setting a leakage protection device: when electric equipment and lines leak electricity or electric shock occurs, an alarm signal can be immediately sent out and the current can be automatically cut off;
(3) The safety voltage is adopted: according to the characteristics of production and operation places, adopting safety voltage with corresponding grade;
(4) A safety chain protection device is arranged for preventing electric shock accidents caused by misoperation, mistaken entering of an electrified interval and the like.
The pressure measurement module is including setting up in the inside forced blowing procedure setting that drives of catalytic oxidation stove, and forced blowing time is not less than 5min to guarantee that furnace and pipeline do not have any residual waste gas, catalytic oxidation stove's top and pipeline outside all are provided with the rupture disk, prevent that organic waste gas concentration from being too high, appear explosion hazard, through the mode of pressure release, ensure safety, through the detection of pressure measurement module, under abnormal conditions, if catalytic combustion or fan appear unusual and lead to pressure to increase, the rupture disk can be leaked and exploded voluntarily, reduce the damage to system equipment.
One end of the power supply control module is connected with an LEL on-line detection unit, the concentration of the control waste gas entering the catalytic combustion is less than 25% LEL, a secondary alarm point is set, the primary alarm point is 15% LEL, the secondary alarm point is 20% LEL, the primary alarm point is reached to prompt the system to check, when the secondary alarm point is reached, the fresh air valve is opened through linkage control, when the alarm lasts for 20 seconds, the system is stopped emergently, the on-line detection unit is connected with the pressure measurement module, and the system is reinforced through the instrument for detecting various display data.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (10)
1. A method for treating exhaust gas, characterized by: the method comprises the following steps:
s1, conveying and extracting organic waste gas generated in a workshop through an induced draft fan to perform induced draft operation, and collecting and conveying the waste gas under the action of a pipeline;
s2, organic waste gas conveyed through a pipeline enters a corresponding dry pre-filtering box, a coarse filter is arranged in the dry pre-filtering box, a spray washing tower is added for treatment after dry pre-treatment, a demister is added after the washing tower, and liquid water in the waste gas is effectively removed;
s3, enabling the filtered waste gas to enter a 1-set zeolite fixed bed for adsorption purification, wherein VOCs components are adsorbed in zeolite;
s4, according to the fact that the gas desorbed by the zeolite fixed bed enters a catalytic oxidation furnace for catalysis under the action of a desorption fan, the desorbed gas forms high-concentration organic gas which is decomposed through catalytic oxidation to form carbon dioxide and water, and the carbon dioxide and water reach the emission standard;
s5, the gas subjected to catalytic oxidation is subjected to adsorption again, secondary filtering operation is carried out on the gas, and then the gas reaching the standard is discharged.
2. A treatment method for exhaust gas according to claim 1, characterized in that: the coarse effect filter removes impurities such as particulate matters and colloid in waste gas, the spray tower can further remove dust to the particulate matters, meanwhile, partial organic components with better water solubility can be absorbed, the concentration of waste gas is reduced, the purification efficiency and the service life of a zeolite adsorption bed are guaranteed, the demister mainly comprises a first stage which is a wire mesh demister, a condensing device is additionally arranged at the bottom of the first stage, the demisting efficiency of fog drops with the particle size of more than 3 mu m can reach more than 98%, and a F9-level filter is arranged at the second stage, so that dust entering the zeolite adsorption bed is guaranteed to meet the requirements.
3. A treatment method for exhaust gas according to claim 1, characterized in that: the spray washing tower is used for purifying waste gas by adopting alkali solution such as sodium hydroxide and the like according to an acid-base neutralization reaction principle, wherein the acid-base waste gas is led out from an air pipe and enters the waste gas washing tower, a filter material tower and water spray are arranged in the washing tower, and a circulating water pump is arranged outside the washing tower; and the washing liquid flows upwards to a filter material layer to be in contact reaction with the neutralizing liquid sprayed out of the nozzle, the washing liquid flowing down from the tower is lifted to the top of the tower through a circulating water pump and is continuously recycled, and the washing liquid is discharged to a sewage treatment station after reaching a certain concentration.
4. A treatment method for exhaust gas according to claim 3, characterized in that: the zeolite fixed bed is made of Q235 steel plates, and the outer layer of the zeolite fixed bed is provided with heat insulation, scald prevention and heat loss reduction effects, and the size is determined according to the field conditions.
5. A method for treating exhaust gas according to claim 4, characterized in that: the catalytic furnace adopts negative pressure desorption, one end of the oxidation catalytic furnace is connected with a high-efficiency plate heat exchanger, heat exchange is carried out with combusted waste flue gas through the high-efficiency plate heat exchanger, heat is recovered, hot gas at about 250 ℃ is obtained, the hot gas is introduced into a zeolite fixed bed to be desorbed, one end of the catalytic oxidation furnace is connected with an electric heater, desorption waste gas enters the catalytic oxidation furnace to be catalytically combusted after being heated by a burner or electric heating, the temperature is 280 ℃ after being started, the normal working condition is 350-450 ℃, the maximum temperature is 650 ℃, the waste gas component is decomposed into CO2 and H2O, and the temperature of the flue gas is increased.
6. A treatment method for exhaust gas according to claim 5, characterized in that: the catalytic oxidation furnace is characterized in that a high-aluminum silicate fiber heat preservation module is adopted in the box body of the catalytic oxidation furnace, the maximum heat preservation thickness is about 250mm, the heat preservation effect is superior to that of common aluminum or high-purity fiber cotton, after heat preservation, the contact part of the box body and a gas medium in the equipment is isolated by high-performance heat preservation cotton, the temperature resistance is 1200-1300 ℃, the temperature of the outer surface of the box body is less than 80 ℃, and a warning mark is arranged on the high-temperature part.
7. A treatment method for exhaust gas according to claim 1, characterized in that: the catalytic oxidation furnace adopts a high-performance poisoning-resistant noble metal type catalyst, the ignition temperature is only 280 ℃, the catalytic activity is high, the service life is long, the airspeed is high (12,000 h-1), the pressure loss is small, the use amount is small, and the occupied area of equipment is reduced.
8. A process control system for exhaust gas according to claim 7, wherein: the system comprises a PLC automatic control system, wherein the operation state of key equipment units, the temperature and the pressure of key points are monitored, and the automatic record is carried out, so that the operation condition of equipment is conveniently evaluated; reserving a DCS interface to a central control room, and adapting to the operation requirements of intermittent and continuous production modes;
the temperature measuring module monitors the temperature generated by the waste gas during treatment and ensures that the temperature of the waste gas during treatment is within a normal range value;
the pressure measuring module is used for carrying out pressure relief and pressurization treatment on the inside of the equipment according to the pressure value generated when the waste gas is treated and the pipeline is carried out, so that the pressure in the equipment is ensured to be normal;
the fan control module is used for controlling the frequency of the fan according to the change of the air quantity and the measured pressure change of the pipeline, changing the air quantity of the fan, saving energy and reducing consumption and ensuring the stability of a production line in a user range;
and the power supply control module is used for carrying out safety protection devices such as power failure protection, overload protection, line fault protection, misoperation and the like on the whole power supply circuit according to the running state of the equipment, all the electric equipment is reliably grounded, the safety of the system in a special state is ensured, and the insulation resistance of an electric appliance loop is not less than 24 megaohms at the relative humidity of 80 percent.
9. A process control system for exhaust gas according to claim 8, wherein: the pressure measurement module is including setting up in the inside forced blowing procedure setting of driving of catalytic oxidation stove, and forced blowing time is not less than 5min to guarantee that furnace and pipeline do not have any residual waste gas, catalytic oxidation stove's top and pipeline outside all are provided with the rupture disk, prevent that organic waste gas concentration from being too high, appear explosion danger, through the mode of pressure release, ensure safety.
10. A process control system for exhaust gas according to claim 9, wherein: one end of the power supply control module is connected with an LEL on-line detection unit, the concentration of the control waste gas entering the catalytic combustion is less than 25% LEL, a secondary alarm point is set, the primary alarm point is 15% LEL, the secondary alarm point is 20% LEL, the primary alarm point is reached to prompt the system to check, when the secondary alarm point is reached, the fresh air valve is opened through linkage control, when the alarm lasts for 20 seconds, the system is stopped in an emergency, and the on-line detection unit is connected with the pressure measurement module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310421857.XA CN116672842B (en) | 2023-04-19 | 2023-04-19 | Treatment method and control system for waste gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310421857.XA CN116672842B (en) | 2023-04-19 | 2023-04-19 | Treatment method and control system for waste gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116672842A true CN116672842A (en) | 2023-09-01 |
| CN116672842B CN116672842B (en) | 2024-04-12 |
Family
ID=87777691
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310421857.XA Active CN116672842B (en) | 2023-04-19 | 2023-04-19 | Treatment method and control system for waste gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116672842B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5096680A (en) * | 1987-07-29 | 1992-03-17 | Waagner-Biro Aktiengesellschaft | Method for waste gas treatment |
| JP2002089240A (en) * | 2000-09-08 | 2002-03-27 | Nissan Motor Co Ltd | Exhaust emission control device and exhaust emission control method using this |
| CN107998820A (en) * | 2017-12-28 | 2018-05-08 | 中科天龙（厦门）环保股份有限公司 | Furniture lacquer spraying waste gas processing unit |
| CN211274117U (en) * | 2019-11-21 | 2020-08-18 | 佛山绿曦环境工程有限公司 | Paint spraying line waste gas adsorption concentration catalytic combustion processing system |
| CN113368652A (en) * | 2021-07-16 | 2021-09-10 | 云南富滇环保科技有限公司 | Treatment method of sulfur-containing organic waste gas in phosphorization industry |
| CN214914699U (en) * | 2021-02-11 | 2021-11-30 | 广州点蓝环保设备有限公司 | Zeolite fixed bed catalytic combustion clean system for paint spraying field |
| CN217549391U (en) * | 2022-04-29 | 2022-10-11 | 广东煜丰实业(集团)有限公司 | Volatile organic waste gas treatment device |
| CN115970466A (en) * | 2023-01-29 | 2023-04-18 | 紫科装备股份有限公司 | Lithium power battery electrolyte waste gas treatment process |
-
2023
- 2023-04-19 CN CN202310421857.XA patent/CN116672842B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5096680A (en) * | 1987-07-29 | 1992-03-17 | Waagner-Biro Aktiengesellschaft | Method for waste gas treatment |
| JP2002089240A (en) * | 2000-09-08 | 2002-03-27 | Nissan Motor Co Ltd | Exhaust emission control device and exhaust emission control method using this |
| CN107998820A (en) * | 2017-12-28 | 2018-05-08 | 中科天龙（厦门）环保股份有限公司 | Furniture lacquer spraying waste gas processing unit |
| CN211274117U (en) * | 2019-11-21 | 2020-08-18 | 佛山绿曦环境工程有限公司 | Paint spraying line waste gas adsorption concentration catalytic combustion processing system |
| CN214914699U (en) * | 2021-02-11 | 2021-11-30 | 广州点蓝环保设备有限公司 | Zeolite fixed bed catalytic combustion clean system for paint spraying field |
| CN113368652A (en) * | 2021-07-16 | 2021-09-10 | 云南富滇环保科技有限公司 | Treatment method of sulfur-containing organic waste gas in phosphorization industry |
| CN217549391U (en) * | 2022-04-29 | 2022-10-11 | 广东煜丰实业(集团)有限公司 | Volatile organic waste gas treatment device |
| CN115970466A (en) * | 2023-01-29 | 2023-04-18 | 紫科装备股份有限公司 | Lithium power battery electrolyte waste gas treatment process |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116672842B (en) | 2024-04-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN207221597U (en) | A kind of VOCs adsoption catalysises burning processing system automatically controlled | |
| CN107511019B (en) | Volatile organic pollutant's processing apparatus | |
| CN107998820A (en) | Furniture lacquer spraying waste gas processing unit | |
| CN111939719A (en) | Device and method for treating automobile maintenance spraying waste gas through activated carbon adsorption, desorption and catalytic combustion | |
| CN2579505Y (en) | Organic waste gas purifying device | |
| CN206617949U (en) | Lacquer spraying waste gas charcoal absorption desorption catalyzing burner | |
| CN115430259A (en) | Efficient and energy-saving waste gas purification system and method for circuit board oven | |
| CN116672842B (en) | Treatment method and control system for waste gas | |
| CN107687662A (en) | A kind of modularization lampblack purifying system | |
| CN211098327U (en) | VOCs processing system with preliminary treatment, zeolite runner and RTO | |
| CN113368652A (en) | Treatment method of sulfur-containing organic waste gas in phosphorization industry | |
| CN212119479U (en) | Zeolite runner adsorbs desorption catalytic combustion all-in-one | |
| CN203605241U (en) | Heat accumulating type thermal force incinerator structure | |
| CN215233307U (en) | High-efficient processing system of volatile organic compounds | |
| CN111589265A (en) | Adsorption desorption catalytic oxidation control processing system | |
| CN215742727U (en) | Movable desorption catalytic combustion equipment | |
| CN214389584U (en) | Rubber flue gas treatment device | |
| CN206081963U (en) | Novel organic waste gas is concentrated device | |
| CN214233346U (en) | Waste gas treatment equipment | |
| CN213348301U (en) | Device for treating automobile maintenance spraying waste gas through activated carbon adsorption, desorption and catalytic combustion | |
| CN213433700U (en) | Organic waste gas treatment equipment | |
| CN209423276U (en) | A kind of lacquer spraying waste gas processing unit | |
| CN209679804U (en) | A kind of adsorption/desorption catalyzing burning waste gas purification device containing security system | |
| CN106422651A (en) | Inert gas protection system for industrial adsorber and operation control method thereof | |
| CN208694662U (en) | A kind of photooxidation catalytic waste gas processing unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |