CN107970751B - Novel method and device for treating organic waste gas - Google Patents
Novel method and device for treating organic waste gas Download PDFInfo
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- CN107970751B CN107970751B CN201711193529.XA CN201711193529A CN107970751B CN 107970751 B CN107970751 B CN 107970751B CN 201711193529 A CN201711193529 A CN 201711193529A CN 107970751 B CN107970751 B CN 107970751B
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- 239000007789 gas Substances 0.000 title claims abstract description 92
- 239000010815 organic waste Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 110
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 92
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 92
- 239000001301 oxygen Substances 0.000 claims abstract description 92
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 81
- 239000003463 adsorbent Substances 0.000 claims abstract description 48
- 238000001179 sorption measurement Methods 0.000 claims abstract description 25
- 239000002912 waste gas Substances 0.000 claims abstract description 24
- 238000005507 spraying Methods 0.000 claims abstract description 9
- 239000007921 spray Substances 0.000 claims description 33
- 229910052799 carbon Inorganic materials 0.000 claims description 25
- 238000012856 packing Methods 0.000 claims description 20
- 239000007800 oxidant agent Substances 0.000 claims description 15
- 230000001590 oxidative effect Effects 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 4
- 238000004064 recycling Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
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- 239000010962 carbon steel Substances 0.000 claims 1
- 239000011152 fibreglass Substances 0.000 claims 1
- 239000004800 polyvinyl chloride Substances 0.000 claims 1
- 239000010935 stainless steel Substances 0.000 claims 1
- 229910001220 stainless steel Inorganic materials 0.000 claims 1
- 239000002957 persistent organic pollutant Substances 0.000 abstract description 25
- 230000003647 oxidation Effects 0.000 abstract description 15
- 238000007254 oxidation reaction Methods 0.000 abstract description 15
- 230000008569 process Effects 0.000 abstract description 11
- 230000008929 regeneration Effects 0.000 abstract description 5
- 238000011069 regeneration method Methods 0.000 abstract description 5
- 238000004140 cleaning Methods 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 4
- 239000000126 substance Substances 0.000 abstract description 4
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 10
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 6
- 239000000945 filler Substances 0.000 description 6
- -1 color removal Chemical compound 0.000 description 4
- TUJKJAMUKRIRHC-UHFFFAOYSA-N hydroxyl Chemical compound [OH] TUJKJAMUKRIRHC-UHFFFAOYSA-N 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 2
- 238000007084 catalytic combustion reaction Methods 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- 238000009303 advanced oxidation process reaction Methods 0.000 description 1
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/38—Removing components of undefined structure
- B01D53/44—Organic components
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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
- B01D53/04—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
- B01D53/0407—Constructional details of adsorbing systems
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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
- B01D53/04—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
- B01D53/0407—Constructional details of adsorbing systems
- B01D53/0446—Means for feeding or distributing gases
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/75—Multi-step processes
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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
- B01D53/34—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
- B01D53/79—Injecting reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/10—Oxidants
- B01D2251/104—Ozone
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/10—Oxidants
- B01D2251/106—Peroxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
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Abstract
The invention relates to a novel method and a device for treating organic waste gas, which adopt a modified activated carbon adsorbent, and utilize the rapid adsorption capacity of the modified activated carbon adsorbent to rapidly and effectively adsorb organic matters in the organic waste gas and adsorb organic pollutants on the surface of the adsorbent. And then spraying and cleaning the modified activated carbon by using active oxygen water generated by an active oxygen generator, and carrying out advanced oxidation treatment on organic pollutants on the surface of the modified activated carbon, so that the organic pollutants are rapidly and thoroughly degraded into substances harmless to the environment. Meanwhile, organic pollutants adsorbed on the surface of the adsorbent are removed, so that the adsorbent is always in an unsaturated state, and the regeneration requirement is reduced. The device and the method do not need to backwash the adsorbent in the operation process, and can be combined with active oxygen water to quickly and effectively oxidize organic pollutants in the waste gas. The device has strong adaptability, high processing speed and greatly reduced occupied area.
Description
Technical Field
The invention relates to a novel treatment method and device for treating organic waste gas, and belongs to the technical field of waste gas treatment.
Background
With the rapid development of industry and agricultural product deep processing industry, the variety and quantity of waste gas are rapidly increased, and the pollution to the atmosphere is also increasingly wide and serious, thereby threatening the health and safety of human beings. Among them, the treatment of organic waste gas is a great difficulty in the current environmental protection industry.
The organic waste gas is inflammable, explosive, toxic, harmful, insoluble in water and organic solvent, and has high treating difficulty. At present, various methods such as an organic waste gas activated carbon adsorption treatment method, a catalytic combustion method, a catalytic oxidation method, an acid-base neutralization method, a plasma method and the like are commonly adopted in the market.
However, the above methods have disadvantages: the plasma method adopts a high-voltage discharge mode, so that the safety can not be ensured in the treatment of flammable and explosive organic waste gas, and explosion events of the organic waste gas treated by the multi-plasma method already occur; the activated carbon adsorption method cannot solve the problem of regeneration after adsorption saturation; the catalytic combustion method and the catalytic oxidation method all need to heat the waste gas to the reaction temperature of the catalyst, have high energy consumption and also need to use a large amount of catalyst.
Under the premise, the invention provides the method and the device for treating the organic waste gas by combining the physical adsorption technology and the advanced oxidation technology at normal temperature, so that the problems of rapid adsorption and oxidation of the organic waste gas at normal temperature are effectively solved, the problem that the adsorption material cannot be regenerated is solved, and the defects in other methods are avoided.
Disclosure of Invention
The invention aims to overcome the problems and defects in the prior art and provides a method and a device for treating organic waste gas by combining physical adsorption technology and advanced oxidation technology at normal temperature. The method and the device adopt a modified activated carbon adsorbent, and utilize the quick adsorption capacity of the modified activated carbon adsorbent to quickly and effectively adsorb organic matters in the organic waste gas, so as to adsorb organic pollutants on the surface of the adsorbent. And then spraying and cleaning the modified activated carbon by using active oxygen water generated by an active oxygen generator, and carrying out advanced oxidation treatment on organic pollutants on the surface of the modified activated carbon, so that the organic pollutants are rapidly and thoroughly degraded into substances harmless to the environment. Meanwhile, organic pollutants adsorbed on the surface of the adsorbent are removed, so that the adsorbent is always in an unsaturated state, and the regeneration requirement is reduced. The treatment device and the treatment process do not need to backwash the adsorbent in the operation process, and can be combined with active oxygen water to quickly and effectively oxidize organic pollutants in the waste gas. The device has strong adaptability, high processing speed and greatly reduced occupied area.
The technical scheme of the invention is as follows:
the utility model provides a novel device of handling organic waste gas, includes purifying column, tube bank formula clarifier, gas distribution dish, packing layer, catch water, active oxygen water spray pipe, active oxygen water generator, circulation spray pump, its characterized in that: the top of the purifying tower is provided with an exhaust port, the lower part of the purifying tower is provided with an air inlet, the bottom of the purifying tower is provided with a water outlet, the steam-water separator, the packing layer, the tube bundle purifier and the gas distribution plate are respectively arranged in the purifying tower from top to bottom in sequence, and the gas distribution plate is positioned above the air inlet; the active oxygen water generator is arranged outside the purifying tower, the water outlet at the bottom of the purifying tower is connected with the water inlet of the circulating spray pump, the water outlet of the circulating spray pump is connected with the water inlet of the active oxygen water generator, the water outlet of the active oxygen water generator is connected with the active oxygen water spray pipe, the active oxygen water spray pipe is respectively connected to the upper part of the packing layer and the inside of the tube bundle type purifier, and the packing layer is sprayed and the modified active carbon adsorbent of the tube bundle type purifier is sprayed.
The gas distribution plate of the device effectively distributes the organic waste gas entering from the gas inlet of the purifying tower, so that the organic waste gas is uniformly distributed on the cross section of the whole purifying tower.
The tube bundle purifier consists of several single tubes, each single tube includes one casing, one swirl vane and one modified active carbon adsorbent, the swirl vane is installed in the air inlet in the lower part of the casing, the modified active carbon adsorbent is filled inside the casing, and the inserted active oxygen water spraying pipe is installed inside each single tube. In the working process, the active oxygen water spray pipe effectively sprays and cleans the modified active carbon adsorbent in a 360-degree direction. The cyclone blades enable gas to enter the tube bundle type purifier in a cyclone mode, so that the gas can be fully and effectively contacted with ozone water and modified activated carbon adsorbent left on the wall surface of a single tube, and the contact time is prolonged.
A novel method for treating organic waste gas, which is characterized by comprising the following steps:
step 1: the organic waste gas is sent to the air inlet of the purifying tower through a pipeline, after entering the tower through the air inlet, the organic waste gas is subjected to gas distribution at the gas distribution plate, so that the organic waste gas is uniformly distributed on the cross section of the whole purifying tower body and is in first contact with active oxygen water flowing out of the tube bundle purifier at a uniform speed, and part of organic matters in the waste gas are oxidized by an oxidant in the active oxygen water;
step 2: after organic waste gas passing through the gas distribution plate is sprayed and oxidized once by active oxygen water, the organic waste gas enters the tube bundle type purifier uniformly and uniformly, when the gas passes through the shell of each single tube, the gas firstly passes through the cyclone blades and rotates along with the direction of the cyclone blades, the gas is fully and effectively contacted with modified active carbon adsorption in a tangential rotation mode, organic matters in the waste gas are adsorbed on the active carbon adsorption surface through the adsorption capacity of the modified active carbon adsorbent, then the surface of the modified active carbon adsorbent is washed in a 360-degree direction through the active oxygen water spraying tube inserted into the tube bundle type purifier, and the organic matters adsorbed on the surface of the modified active carbon are deeply oxidized and removed through the oxidant in the active oxygen water; after the unreacted completely active oxygen water flows out of the tube-bundle purifier, the active oxygen water contacts with organic waste gas passing through a gas distribution plate to continue reaction;
step 3: if the purified waste gas treated by the tube bundle type purifier is not completely treated, the common activated carbon layer is filled by the filler layer at the moment, and a small amount of organic waste gas which is not completely purified is removed under the adsorption action of the common activated carbon; part of the organic waste gas is oxidized again by the active oxygen water sprayed from the upper part of the packing layer, and is removed, so that organic matters in the gas discharged from the purifying tower are removed. The filler layer is arranged on the upper part of the tube bundle type purifier, and the common activated carbon layer filled is arranged as a security layer.
Step 4: the active oxygen water flowing to the bottom of the purifying tower consumes most of the oxidant, and is injected into the active oxygen water generator again through a spray circulating pump and a pipeline, and after the active oxygen water is generated again, the active oxygen water generator is connected with an inserted active oxygen water spray pipe in the tube bundle type purifier and the active oxygen water spray pipe at the upper part of the packing layer through the pipeline for recycling.
The invention adopts a modified activated carbon adsorbent, and utilizes the quick adsorption capacity of the modified activated carbon adsorbent to quickly and effectively adsorb organic matters in organic waste gas and adsorb organic pollutants on the surface of the adsorbent. And then spraying and cleaning the modified activated carbon by using the active oxygen water generated by the active oxygen water generator, and carrying out advanced oxidation treatment on organic pollutants on the surface of the modified activated carbon, so that the organic pollutants are rapidly and thoroughly degraded into substances harmless to the environment. Meanwhile, organic pollutants adsorbed on the surface of the modified activated carbon are removed, so that the modified activated carbon is always in an unsaturated state, and the regeneration requirement is reduced. The treatment device and the treatment process do not need to backwash the modified activated carbon, and can be combined with active oxygen water to quickly and effectively oxidize organic pollutants in the waste gas during operation. The device has strong adaptability, high processing speed and greatly reduced occupied area.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic view of a single tube structure of the tube bundle type purifier of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, the device of the invention comprises a purifying tower 1, a tube bundle type purifier 2, a gas distribution plate 3, a packing layer 4, a steam-water separator 5, an active oxygen water spray pipe 6, an active oxygen water generator 7 and a circulating spray pump 8, and is characterized in that: the top of the purifying tower 1 is provided with an exhaust port, the lower part of the purifying tower 1 is provided with an air inlet, the bottom of the purifying tower 1 is provided with a water outlet, the steam-water separator 5, the packing layer 4, the tube bundle purifier 2 and the gas distribution plate 3 are respectively arranged in the purifying tower 1 from top to bottom in sequence, and the gas distribution plate 3 is positioned above the air inlet; the active oxygen water generator 7 is arranged outside the purifying tower 1, the water outlet at the bottom of the purifying tower 1 is connected with the water inlet of the circulating spray pump 8, the water outlet of the circulating spray pump 8 is connected with the water inlet of the active oxygen water generator 7, the water outlet of the active oxygen water generator 7 is connected with the active oxygen water spray pipe 6, the active oxygen water spray pipe 6 is respectively connected to the upper part of the packing layer 4 and the inside of the tube bundle type purifier 2, and the packing layer 4 is sprayed and the modified active carbon adsorbent of the tube bundle type purifier 2 is sprayed. The gas distribution plate 3, the steam-water separator 5 and the active oxygen water generator 7 are of the existing structure, the filler layer 4 is filled with common active carbon, and the tube-bundle purifier 2 is filled with modified active carbon adsorbent.
As shown in figure 2, the tube-bundle purifier consists of a plurality of single tubes, each single tube comprises a shell 2-1, swirl vanes 2-3 and a modified activated carbon adsorbent 2-2, the swirl vanes 2-3 are arranged at the air inlet at the lower part in the shell 2-1, the modified activated carbon adsorbent 2-2 is filled in the shell 2-1, and an inserted active oxygen water spray tube 6 is arranged in each single tube. In the working process, the active oxygen water spray pipe effectively sprays and cleans the modified active carbon adsorbent in a 360-degree direction. The cyclone blades 2-3 enable gas to enter in a cyclone mode when entering the tube bundle type purifier 2, so that the gas can be fully and effectively contacted with ozone water and modified activated carbon adsorbent left on the wall surface of a single tube, and the contact time is increased.
The gas distribution plate of the device effectively distributes the organic waste gas entering from the gas inlet of the purifying tower, so that the organic waste gas is uniformly distributed on the cross section of the whole purifying tower.
A novel method for treating organic waste gas, which is characterized by comprising the following steps:
step 1: the organic waste gas is sent to the air inlet of the purifying tower through a pipeline, after entering the tower through the air inlet, the organic waste gas is subjected to gas distribution at the gas distribution plate, so that the organic waste gas is uniformly distributed on the cross section of the whole purifying tower body and is in first contact with active oxygen water flowing out of the tube bundle purifier at a uniform speed, and part of organic matters in the waste gas are oxidized by an oxidant in the active oxygen water;
step 2: after organic waste gas passing through the gas distribution plate is sprayed and oxidized once by active oxygen water, the organic waste gas enters the tube bundle type purifier uniformly and uniformly, when the gas passes through the shell of each single tube, the gas firstly passes through the cyclone blades and rotates along with the direction of the cyclone blades, the gas is fully and effectively contacted with modified active carbon adsorption in a tangential rotation mode, organic matters in the waste gas are adsorbed on the active carbon adsorption surface through the adsorption capacity of the modified active carbon adsorbent, then the surface of the modified active carbon adsorbent is washed in a 360-degree direction through the active oxygen water spraying tube inserted into the tube bundle type purifier, and the organic matters adsorbed on the surface of the modified active carbon are deeply oxidized and removed through the oxidant in the active oxygen water; after the unreacted completely active oxygen water flows out of the tube-bundle purifier, the active oxygen water contacts with organic waste gas passing through a gas distribution plate to continue reaction;
step 3: if the purified waste gas treated by the tube bundle type purifier is not completely treated, the common activated carbon filled in the filler layer is removed by the filler layer, and a small amount of organic waste gas which is not completely purified is removed under the adsorption action of the common activated carbon; part of the organic waste gas is oxidized again by the active oxygen water sprayed from the upper part of the packing layer, and is removed, so that organic matters in the gas discharged from the purifying tower are removed. The filler layer is arranged on the upper part of the tube bundle type purifier, and the filled common activated carbon is used as a security layer.
Step 4: the active oxygen water flowing to the bottom of the purifying tower consumes most of the oxidant, and is injected into the active oxygen water generator again through a spray circulating pump and a pipeline, and after the active oxygen water is generated again, the active oxygen water generator is connected with an inserted active oxygen water spray pipe in the tube bundle type purifier and the active oxygen water spray pipe at the upper part of the packing layer through the pipeline for recycling.
Working principle and characteristics:
the invention adopts a modified activated carbon adsorbent, and utilizes the quick adsorption capacity of the modified activated carbon adsorbent to quickly and effectively adsorb organic matters in organic waste gas and adsorb organic pollutants on the surface of the adsorbent. Then the active oxygen water (active oxygen comprises ozone, oxygen, hydrogen peroxide and hydroxyl radical (O) 3 ,O,H 2 O 2 OH) spraying and cleaning the modified activated carbon adsorbent, and deeply oxidizing organic pollutants on the surface of the modified activated carbon adsorbent to quickly and thoroughly degrade the organic pollutants into substances harmless to the environment. Meanwhile, organic pollutants adsorbed on the surface of the modified activated carbon adsorbent are removed, so that the modified activated carbon adsorbent is always in an unsaturated state, and the regeneration requirement is reduced. The treatment device and the treatment process do not need to backwash the adsorbent in the operation process, can combine active oxygen in the operation process, rapidly and effectively oxidize organic pollutants in the waste gas, and are adaptiveThe method is strong, the treatment speed is high, and the occupied area is greatly reduced.
According to the property and treatment target of the waste gas, the traditional activated carbon can be subjected to surface modification by using a specific medicament to prepare a modified activated carbon adsorbent for treating the symptom, so that the modified activated carbon adsorbent can be used for removing organic matters in the waste gas in a selective way. After modification, the original surface structure and pores of the activated carbon are unchanged, so that the modified activated carbon adsorbent still has the inherent characteristics of the activated carbon such as color removal, deodorization and the like.
The active oxygen water mainly comprises ozone, oxygen, hydrogen peroxide and hydroxyl free radical (O) 3 ,O,H 2 O 2 OH) as the primary oxidant. It is known that the higher the oxidation potential of an oxidant, the more oxidizing properties thereof. The oxidation potential of some oxidants is shown in Table 1, and the higher the oxidation potential, the stronger the capability of decomposing organic matters. The active oxygen water contains ozone, oxygen, hydrogen peroxide and hydroxyl radical (OH), and as can be seen from Table 1, the hydroxyl radical (OH) is a stronger oxidant than ozone, and all reactions that degrade organic pollutants with (OH) are called advanced oxidation processes. Therefore, in the oxidation process of the organic matters in the waste gas, under the combined action of ozone, oxygen, hydrogen peroxide and hydroxyl radicals (OH), the purification capability of the organic matters in the waste gas is better than that of the traditional other modes.
TABLE 1 oxidation potential of some oxidants
In addition, table 2 compares the reaction rates (unit: M) of ozone and hydroxyl radicals (. OH) for oxidative decomposition of some organics -1 ·sec -1 M is molar):
TABLE 2O 3 Reaction Rate with OH to decompose some organic pollutants
Therefore, the invention adopts a plurality of oxidants in the active oxygen water containing ozone, oxygen, hydrogen peroxide and hydroxyl free radicals (OH) to remove a plurality of complex organic matters in the gas by very rapid and effective oxidation. There are incomparable advantages over other exhaust treatment schemes.
According to the treatment device and the treatment process which are combined by the physical adsorption technology and the advanced oxidation technology, on one hand, organic pollutants in the waste gas can be quickly and effectively transferred to the surface of the physical adsorbent, so that the waste gas can be purified in the shortest time; on the other hand, the active oxygen water can thoroughly treat the organic pollutants adsorbed on the surface of the modified active carbon adsorbent in the waste gas in a harmless way. By the combination mode, the device can be continuously used, and physical adsorption is always in an unsaturated state, so that shutdown backwashing is not needed.
The device can be used for carrying out online acquisition on data through an online monitor according to the characteristics of organic pollutants in the waste gas, and carrying out treatment through a PLC, so that indexes such as the spraying active oxygen water quantity, the active oxygen generation quantity and the like of a regulating system can be adapted to various different organic waste gases.
Claims (2)
1. The utility model provides a novel device of handling organic waste gas, includes purifying column, tube bank formula clarifier, gas distribution dish, packing layer, catch water, active oxygen water spray pipe, active oxygen water generator, circulation spray pump, its characterized in that: the top of the purifying tower is provided with an exhaust port, the lower part of the purifying tower is provided with an air inlet, the bottom of the purifying tower is provided with a water outlet, the steam-water separator, the packing layer, the tube bundle purifier and the gas distribution plate are respectively arranged in the purifying tower from top to bottom in sequence, and the gas distribution plate is positioned above the air inlet; the active oxygen water generator is arranged outside the purifying tower, the water outlet at the bottom of the purifying tower is connected with the water inlet of the circulating spray pump, the water outlet of the circulating spray pump is connected with the water inlet of the active oxygen water generator, the water outlet of the active oxygen water generator is connected with the active oxygen water spray pipe, the active oxygen water spray pipe is respectively connected to the upper part of the packing layer and the inside of the tube-bundle purifier, and the packing layer is sprayed and the modified active carbon adsorbent of the tube-bundle purifier is sprayed;
the tube bundle purifier consists of a plurality of single tubes, each single tube comprises a shell, a swirl vane and a modified activated carbon adsorbent, the swirl vane is arranged at an air inlet at the lower part in the shell, the modified activated carbon adsorbent is filled in the shell, and an inserted active oxygen water spray tube is arranged in each single tube;
the purifying tower is made of carbon steel, stainless steel, glass fiber reinforced plastic, PVC or PP materials.
2. A novel method for treating organic waste gas, which is characterized by comprising the following steps: step 1: the organic waste gas is sent to the air inlet of the purifying tower through a pipeline, after entering the tower through the air inlet, the organic waste gas is subjected to gas distribution at the gas distribution plate, so that the organic waste gas is uniformly distributed on the cross section of the whole purifying tower body and is in first contact with active oxygen water flowing out of the tube bundle purifier at a uniform speed, and part of organic matters in the waste gas are oxidized by an oxidant in the active oxygen water; step 2: after organic waste gas passing through the gas distribution plate is sprayed and oxidized once by active oxygen water, the organic waste gas uniformly and uniformly enters the tube bundle type purifier, when the gas passes through the shell of each single tube, the gas firstly passes through the cyclone blades, rotates along with the direction of the cyclone blades, contacts with modified active carbon adsorption in a tangential rotation mode, adsorbs organic matters in the waste gas to the active carbon adsorption surface through the adsorption capacity of the modified active carbon adsorbent, then washes the surface of the modified active carbon adsorbent in a 360-degree direction through the active oxygen water spraying tube inserted in the tube bundle type purifier, and deeply oxidizes and removes the organic matters adsorbed on the surface of the modified active carbon through the oxidant in the active oxygen water; after the unreacted completely active oxygen water flows out of the tube-bundle purifier, the active oxygen water contacts with organic waste gas passing through a gas distribution plate to continue reaction; step 3: the purified waste gas treated by the tube bundle type purifier is treated by a packing layer, the packing layer is filled with a common activated carbon layer, and a small amount of organic waste gas which is not completely purified is removed under the adsorption action of the common activated carbon; part of the organic waste gas is oxidized and removed again by the active oxygen water sprayed from the upper part of the packing layer, so that organic matters in the gas discharged out of the purifying tower are removed; step 4: the active oxygen water flowing to the bottom of the purifying tower consumes most of the oxidant, and is injected into the active oxygen water generator again through a spray circulating pump and a pipeline, and after the active oxygen water is generated again, the active oxygen water generator is connected with an inserted active oxygen water spray pipe in the tube bundle type purifier and the active oxygen water spray pipe at the upper part of the packing layer through the pipeline for recycling.
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| TWI767416B (en) * | 2020-11-19 | 2022-06-11 | 濾能股份有限公司 | Activated carbon modification method, filter mesh structure and use thereof, filter material regeneration method |
| CN113499665A (en) * | 2021-02-23 | 2021-10-15 | 浙江省农业科学院 | Livestock manure composting deodorization method, device and system by using manure-based biochar |
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