CN115487663B - VOCs waste gas purification system containing high-concentration aromatic hydrocarbon and purification method - Google Patents
VOCs waste gas purification system containing high-concentration aromatic hydrocarbon and purification method Download PDFInfo
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D53/32—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 electrical effects other than those provided for in group B01D61/00
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- 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
- B01D53/76—Gas phase processes, e.g. by using aerosols
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/84—Biological processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D—SEPARATION
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/869—Multiple step processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention relates to the technical field of VOCs waste gas purification, and discloses a VOCs waste gas purification system containing high-concentration aromatic hydrocarbon and a purification method, wherein the purification system comprises a washing tower, a primary biological deodorization device, a secondary biological deodorization device, a deep treatment device, a fan, an exhaust pipe and an activation energy generating device which are sequentially connected, a pretreatment water tank and a first activation catalytic device are connected on a spray water circulation pipeline of the washing tower, the primary water tank and a second activation catalytic device are connected on a spray water circulation pipeline of the primary biological deodorization device, the secondary water tank and a third activation catalytic device are connected on a spray water circulation pipeline of the secondary biological deodorization device, and the activation energy generating device is respectively connected with the first activation catalytic device, the second activation catalytic device and the third activation catalytic device. The purification method can effectively improve the purification efficiency of the VOCs waste gas with high aromatic hydrocarbon concentration, and can meet the increasingly-improved VOCs emission requirement.
Description
Technical Field
The invention relates to the technical field of VOCs waste gas purification, in particular to a VOCs waste gas purification system containing high-concentration aromatic hydrocarbon and a purification method.
Background
Volatile Organic Compounds (VOCs) generally refer to various organic compounds with boiling points below 260 ℃ at normal temperature, and mainly comprise aromatic hydrocarbons, alkanes, alkenes, halogenated hydrocarbons, esters, aldehydes, ketones and other organic compounds. The molecular structure of aromatic substances is stable and difficult to remove, and particularly aromatic benzene has extremely high stability. Aromatic substances have the following characteristics:
a. easy vaporization, easy escape, difficult dissolution and difficult capture and absorption by water;
b. the molecular structure is complex and stable, and is not easy to be destroyed, transformed and removed;
c. most aromatic substances have strong toxicity and are difficult to remove by biological purification.
The purification method of VOCs with high concentration of aromatic hydrocarbon is mostly incineration. The incineration device for the VOCs with the low enthalpy value relates to the control problem of dioxin products, and has the advantages of large investment, high operation cost, heavy enterprise burden, great consumption of a large amount of combustion substances for supporting the VOCs to be incinerated for a long time, great increase of carbon emission of flue gas, heavy environmental burden and certain danger.
The existing purification method of VOCs with high aromatic hydrocarbon concentration, such as UV photolysis, low-temperature plasma technology, active carbon adsorption and the like, not only needs full-flow treatment, but also has the advantages of huge treatment equipment, low efficiency, high investment, high maintenance rate, short catalyst life, extremely low operation guarantee rate and certain danger.
The biological purification method is a VOCs treatment method with the lowest running cost at present, but has extremely low purification efficiency on toxic and difficultly-dissolved and difficultly-degraded aromatic substances, and a purification system cannot effectively run when the concentration is high.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a VOCs waste gas purification system containing high-concentration aromatic hydrocarbon and a purification method.
In order to achieve the above object, the technical scheme of the present invention is as follows: the utility model provides a VOCs exhaust gas purification system who contains high concentration aromatic hydrocarbon, includes scrubbing tower, one-level biological deodorizing device, second grade biological deodorizing device, advanced treatment unit, fan and the aiutage that connects gradually, the VOCs exhaust gas pipeline is connected to the scrubbing tower air inlet, scrubbing tower, one-level biological deodorizing device and second grade biological deodorizing device all are equipped with spray water circulation pipeline, its characterized in that: the device also comprises an activation energy generating device, the spray water circulation pipeline of the washing tower is connected with the pretreatment water tank and the first activation catalytic device, the spray water circulation pipeline of the primary biological deodorization device is connected with the primary water tank and the second activation catalytic device, the second-stage biological deodorization device is connected with a second-stage water tank and a third activation catalytic device on a spray water circulation pipeline, and the activation energy generating device is respectively connected with the first activation catalytic device, the second activation catalytic device and the third activation catalytic device;
the first activation catalytic unit, the second activation catalytic unit and the third activation catalytic unit have the same structure, the first activation catalytic unit comprises a shell, a magnetic grid inlet and a magnetic grid outlet are respectively arranged at the left end and the right end of the shell, three groups of electrode frames are respectively arranged between the magnetic grid inlet and the magnetic grid outlet in the shell, a catalytic area is arranged between each group of electrode frames, a catalyst is filled in the catalytic area, electrode plates in the electrode frames are connected with an outer distribution box through an electrode guide rod, gas micropore distributors are arranged below the electrode frames and below the catalytic area in the shell, each gas micropore distributor comprises a main pipe, a circulating branch pipe is connected with an air inlet of the main pipe, and a plurality of exhaust ports are uniformly distributed on the main pipe and the circulating branch pipe.
Further; and the three groups of electrode frames form a weak current mixed electric field after being connected with a direct current power supply.
Further; the first activation catalytic device is connected to a connecting pipeline between the outlet of the pretreatment water tank and the spray water inlet of the washing tower, the second activation catalytic device is connected to a connecting pipeline between the outlet of the first water tank and the spray water inlet of the first biological deodorization device, and the third activation catalytic device is connected to a connecting pipeline between the outlet of the second water tank and the spray water inlet of the second biological deodorization device.
Further; the pretreatment water tank, the primary water tank and the secondary water tank are all provided with an activated water circulation pipeline, the activated water circulation pipeline of the pretreatment water tank is connected with a fourth activated catalytic device, the activated water circulation pipeline of the primary water tank is connected with a fifth activated catalytic device, the activated water circulation pipeline of the secondary water tank is connected with a sixth activated catalytic device, the structures of the fourth activated catalytic device, the fifth activated catalytic device and the sixth activated catalytic device are the same as those of the first activated catalytic device, and the activated energy generating device is respectively connected with the fourth activated catalytic device, the fifth activated catalytic device and the sixth activated catalytic device.
Further; and the spray water circulation pipeline and the activated water circulation pipeline are both provided with circulating water pumps.
Further; and guide barrels are connected outside the magnetic grid inlet and the magnetic grid outlet.
Further; the activation energy gas comprises a purge factor, the purge factor comprising: e, e - Hydroxyl radical, ozone, nascent oxygen, H 2 And a mixture of electron-carrying gas molecules and atoms.
The other technical scheme of the invention is as follows: the method for purifying the VOCs waste gas containing high-concentration aromatic hydrocarbon is characterized by comprising the following steps of:
1) Filling reclaimed water into the pretreatment water tank, the primary water tank and the secondary water tank, starting a pretreatment water tank activation water circulation pipeline, a circulating water pump on the primary water tank activation water circulation pipeline and the secondary water tank activation water circulation pipeline, starting a fourth activation catalysis device, a fifth activation catalysis device and a sixth activation catalysis device, and adjusting the voltage of a weak electric mixed electric field to be 12-36V and the current to be 1-2A;
2) Adding alkali liquor into the pretreatment water tank, and maintaining the pH value of reclaimed water in the pretreatment water tank to be 8.0-9.0;
3) Starting a spray water circulation pipeline of the washing tower, a spray water circulation pipeline of the primary biological deodorization device and a circulating water pump of the spray water circulation pipeline of the secondary biological deodorization device, and adjusting the circulating water flow to 20-25 m 3 Starting the first activation catalytic device, the second activation catalytic device and the third activation catalytic device, and adjusting the voltage of the weak electric mixed electric field to be 12-36V and the current to be 1-2A;
4) The activation energy generating device is started to provide activation energy gas for the first activation catalytic device, the second activation catalytic device, the third activation catalytic device, the fourth activation catalytic device, the fifth activation catalytic device and the sixth activation catalytic device respectively, and the air supply amounts are respectively 1.0-2.0 m 3 And/h, the activation energy gas comprises a purification factor, and the purification factor comprises: e-, hydroxyl radical, ozone, nascent oxygen, H 2 And a mixture of gas molecules and atoms carrying electrons, wherein the activation energy gas respectively enters the first activation catalytic device to the sixth activation catalytic device through the gas micropore distributor;
5) VOCs waste gas is introduced into the washing tower, part of the waste gas is entrained and absorbed by spray water in the washing tower and enters a pretreatment water tank, then enters a first activation catalytic device and a fourth activation catalytic device through a spray water circulation pipeline and an activation water circulation pipeline, weak electric mixing electric fields in the first activation catalytic device and the fourth activation catalytic device are used for carrying out catalytic decomposition on the entrained insoluble waste gas in the spray water, so that the stability of the waste gas is destroyed, the catalyst in the catalytic region is used for carrying out further catalytic decomposition on the entrained insoluble waste gas, the waste gas which is not entrained, absorbed and escaped by the spray water enters a first-stage biological deodorization device, after being sprayed by the spray water in the device, the insoluble waste gas entrained by the spray water is catalyzed and decomposed by a second activation catalytic device and a fifth activation catalytic device, and the waste gas which is not entrained, absorbed and escaped by the spray water is subjected to biological degradation in the first-stage biological deodorization device; after the biodegraded waste gas enters a secondary biological deodorization device and is sprayed by spray water in the device, the indissolvable waste gas carried by the spray water is catalyzed and decomposed by a third activation and catalysis device and a sixth activation and catalysis device through water circulation, and the waste gas which is not carried, absorbed and escaped by the spray water is biodegraded in the secondary biological deodorization device; and the waste gas after biodegradation enters an advanced treatment device, and the waste gas is discharged after advanced treatment.
The invention has the beneficial effects that:
the invention adds an activation energy generating device and an activation catalytic device on the basis of the original biological purification VOCs peculiar smell treatment device, and the activation energy gas generated by the activation energy generating device comprises a purification factor which comprises: e, e - Hydroxyl radical, ozone, nascent oxygen, H 2 And the mixture of gas molecules and atoms carrying electrons, wherein the activated energy gas enters an activated catalytic device through a gas micropore distributor to treat waste gas pollutants, has strong polarity of a purifying factor and good net capturing effect, is favorable for dissolving, purifying and decomposing the waste gas pollutants, and directly decomposes VOCs (volatile organic compounds) which are carried in water and are difficult to be dissolved by water into carbon dioxide and water under the action of the purifying factor or is decomposed into intermediate products which are easy to be biodegraded to be assimilated and removed.
The three groups of electrode frames in the activation catalytic device are connected with a direct current power supply to form a weak current mixed electric field, and the weak current mixed electric field can destroy the stability of VOCs pollutants which are carried in water and are difficult to be dissolved by water, so that the effects of being decomposed and purified are achieved, the secondary escape property of the VOCs is weakened, the degradation resistance of the VOCs is reduced, and the toxicity and the stable structure of aromatic substances are reduced.
The purification method can effectively improve the purification efficiency of the VOCs with high aromatic hydrocarbon concentration, has low investment, low running cost and high stability, and can meet the increasingly-improved VOCs emission requirement.
Drawings
FIG. 1 is a system block diagram of embodiment 1 of the present invention;
FIG. 2 is a schematic view of the first catalytic activation device according to embodiment 1 of the present invention;
FIG. 3 is a schematic diagram of a gas microporous distributor according to example 1 of the present invention;
FIG. 4 is a system block diagram of comparative example 1;
FIG. 5 is a weak current waveform diagram of a primary electrode frame;
FIG. 6 is a weak current waveform diagram of a secondary electrode frame;
FIG. 7 is a weak current waveform diagram of a three stage electrode frame;
FIG. 8 is a schematic diagram of a decontamination factor treatment of a contaminant;
FIG. 9 is a schematic diagram of the decomposition and conversion of phenol in exhaust gas by weak electric mixing field;
fig. 10 is a schematic diagram of the reaction of ozone in the purification factor with benzene in the exhaust gas.
In the figure: 1. a housing; 2. a magnetic grid inlet; 3. a magnetic grille outlet; 4. an electrode frame; 41. a primary electrode frame; 42. a secondary electrode frame; 43. a three-stage electrode frame; 5. a catalytic zone; 6. a gas micropore distributor; 61. a main pipe; 62. a circulation branch pipe; 7. a guide cylinder.
Detailed Description
The activation energy generating device is purchased from Hui Quan Beijing as an environmental management engineering Limited liability company, and the model is HQC-AGS-20.
In the activation energy generating device, raw material gas is subjected to freeze dehydration, filtration and purification, and after denitrification and oxygen enrichment, gas molecules are ionized into electrons, photons, ions, free radicals, active atoms, excited atoms, active molecular fragments and the like through a strong ionization discharge field, so that a purification factor with low energy consumption is provided for a directional reaction cavity.
Example 1:
as shown in fig. 1 to 3, a high-concentration aromatic hydrocarbon-containing VOCs waste gas purification system comprises a washing tower, a primary biological deodorization device, a secondary biological deodorization device, an advanced treatment device, a fan, an exhaust pipe and an activation energy generation device which are sequentially connected, wherein an air inlet of the washing tower is connected with a VOCs waste gas pipeline, spray water circulation pipelines are respectively arranged on the washing tower, the primary biological deodorization device and the secondary biological deodorization device, a pretreatment water tank and a first activation catalysis device are connected on the spray water circulation pipeline of the washing tower, a primary water tank and a second activation catalysis device are connected on the spray water circulation pipeline of the primary biological deodorization device, a secondary water tank and a third activation catalysis device are connected on the spray water circulation pipeline of the secondary biological deodorization device, and the activation energy generation device is respectively connected with the first activation catalysis device, the second activation catalysis device and the third activation catalysis device.
The first activation catalytic device, the second activation catalytic device and the third activation catalytic device are identical in structure, the first activation catalytic device comprises a shell 1, a magnetic grid inlet 2 and a magnetic grid outlet 3 are respectively arranged at the left end and the right end of the shell 1, three groups of electrode frames 4 are respectively arranged between the magnetic grid inlet 2 and the magnetic grid outlet 3 in the shell 1, a catalytic zone 5 is arranged between each group of electrode frames 4, a catalyst is filled in the catalytic zone 5, electrode plates in the electrode frames 4 are connected with an external distribution box through an electrode guide rod, a gas micropore distributor 6 is arranged below the electrode frames 4 and below the catalytic zone 5 in the shell 1, the gas micropore distributor 6 comprises a main pipe 61, a circulating branch pipe 62 is connected in a penetrating manner outside the main pipe 61, the main pipe 61 is connected with an activation energy generating device, and a plurality of exhaust ports are uniformly distributed on the main pipe 61 and the circulating branch pipe 62.
The three groups of electrode frames 4 form a weak current mixed electric field after being connected with a direct current power supply.
The first activation catalytic device is connected to a connecting pipeline between the outlet of the pretreatment water tank and the spray water inlet of the washing tower, the second activation catalytic device is connected to a connecting pipeline between the outlet of the first water tank and the spray water inlet of the first biological deodorization device, and the third activation catalytic device is connected to a connecting pipeline between the outlet of the second water tank and the spray water inlet of the second biological deodorization device.
The pretreatment water tank, the primary water tank and the secondary water tank are all provided with an activated water circulation pipeline, the activated water circulation pipeline of the pretreatment water tank is connected with a fourth activated catalytic device, the activated water circulation pipeline of the primary water tank is connected with a fifth activated catalytic device, the activated water circulation pipeline of the secondary water tank is connected with a sixth activated catalytic device, the structures of the fourth activated catalytic device, the fifth activated catalytic device and the sixth activated catalytic device are the same as those of the first activated catalytic device, and the activated energy generating device is respectively connected with the fourth activated catalytic device, the fifth activated catalytic device and the sixth activated catalytic device.
And the spray water circulation pipeline and the activated water circulation pipeline are both provided with circulating water pumps.
The magnetic grating inlet 2 and the magnetic grating outlet 3 are both connected with the guide cylinder 7, and the magnetic grating inlet 2 and the magnetic grating outlet 3 are both provided with two layers of magnetic gratings crossing at 90 degrees, so that magnetic lines of force are uniformly distributed.
Example 2:
a method for purifying VOCs waste gas containing high-concentration aromatic hydrocarbon comprises the following steps:
1) Filling reclaimed water into a pretreatment water tank, a primary water tank and a secondary water tank, wherein the reclaimed water is waste water discharged from a sewage plant after reaching standards, starting a pretreatment water tank activation water circulation pipeline, a primary water tank activation water circulation pipeline and a secondary water tank activation water circulation pipeline to activate a circulating water pump on the water circulation pipeline, starting a fourth activation catalytic device, a fifth activation catalytic device and a sixth activation catalytic device, and adjusting the voltage and the current of a weak electric mixed electric field to be between 12 and 36V and 1 to 2A;
2) Adding alkali liquor into the pretreatment water tank, wherein the alkali liquor is sodium hydroxide solution, and maintaining the pH value of reclaimed water in the pretreatment water tank to be 8.0-9.0;
3) Starting a spray water circulation pipeline of the washing tower, a spray water circulation pipeline of the primary biological deodorization device and a circulating water pump of the spray water circulation pipeline of the secondary biological deodorization device, and adjusting the circulating water flow to 25m 3 Starting the first activation catalytic device, the second activation catalytic device and the third activation catalytic device, and adjusting the voltage of the weak electric mixed electric field to be 12-36V and the current to be 1-2A;
the three groups of electrode frames 4 are a primary electrode frame 41, a secondary electrode frame 42 and a tertiary electrode frame 43 from the magnetic grid inlet 2 to the magnetic grid outlet 3 respectively, weak current waveforms of the primary electrode frame 41 are shown in fig. 5, weak current waveforms of the secondary electrode frame 42 are shown in fig. 6, and weak current waveforms of the tertiary electrode frame 43 are shown in fig. 7;
4) The activation energy generating device is respectively a first activation catalytic device, a second activation catalytic device, a third activation catalytic device, a fourth activation catalytic device and a fifth activation catalytic deviceThe device and the sixth activation and catalysis device provide activation energy gas, and the gas supply amounts are respectively 2.0m 3 And/h, the activation energy gas comprises a purification factor, and the purification factor comprises: e, e - Hydroxyl radical, ozone, nascent oxygen, H 2 And a mixture of gas molecules and atoms carrying electrons, wherein the activation energy gas respectively enters the first activation catalytic device to the sixth activation catalytic device through the gas micropore distributor; the principle of the purification factor for treating pollutants is shown in fig. 8;
5) VOCs waste gas is introduced into the washing tower, part of the waste gas is absorbed by spray water in the washing tower and enters a pretreatment water tank, then enters a first activation catalytic device and a fourth activation catalytic device through a spray water circulation pipeline and an activation water circulation pipeline, weak electric mixed electric fields in the first activation catalytic device and the fourth activation catalytic device carry out catalytic decomposition on insoluble waste gas carried in the spray water, pollutants in the waste gas undergo the activation catalytic effect of the weak electric mixed electric fields, and the stability is destroyed, so that the pollutants are decomposed and absorbed; the principle of the decomposition and conversion of phenol in the waste gas by weak electric mixing electric field is shown in figure 9; the purification factors released by the gas micropore distributor decompose and convert pollutants in the waste gas, so that the capturing and purifying efficiency of spray water on the waste gas is improved, and the secondary escape is reduced; the schematic diagram of the reaction of ozone in the purification factors and benzene in the exhaust gas is shown in figure 10;
meanwhile, the catalyst in the catalytic zone can further catalyze and decompose the waste gas, the decomposed waste gas is dissolved in spray water, the waste gas which is not entrained, absorbed and escaped by the spray water enters the first-stage biological deodorization device, after being sprayed by the spray water in the device, the waste gas which is entrained and absorbed by the spray water is catalyzed and decomposed by the second activating and catalyzing device and the fifth activating and catalyzing device through water circulation, and the waste gas which is not entrained, absorbed and escaped by the spray water is biodegraded in the first-stage biological deodorization device; the waste gas after biodegradation enters a secondary biological deodorization device, after being sprayed by spray water in the device, the waste gas which is entrained and absorbed by the spray water is catalyzed and decomposed by a third activation and catalysis device and a sixth activation and catalysis device through water circulation, and the waste gas which is not entrained, absorbed and escaped by the spray water is biodegraded in the secondary biological deodorization device; the waste gas after biodegradation enters a deep treatment device, and is introduced into an exhaust barrel to reach the standard for emission through a fan after the waste gas is subjected to deep treatment.
Comparative example 1:
as shown in FIG. 4, the VOCs waste gas purification system is an original biological purification VOCs peculiar smell treatment device, and comprises a washing tower, a primary biological deodorization device, a secondary biological deodorization device, an advanced treatment device, a fan and an exhaust pipe which are sequentially connected, wherein an air inlet of the washing tower is connected with a VOCs waste gas pipeline, the washing tower, the primary biological deodorization device and the secondary biological deodorization device are all provided with spray water circulation pipelines, a pretreatment water tank is connected on the spray water circulation pipeline of the washing tower, a primary water tank is connected on the spray water circulation pipeline of the primary biological deodorization device, and a secondary water tank is connected on the spray water circulation pipeline of the secondary biological deodorization device.
A method for purifying exhaust gas from VOCs, comprising the steps of:
1) Fresh water is filled into the pretreatment water tank, the primary water tank and the secondary water tank, alkali liquor is added into the pretreatment water tank, the alkali liquor is sodium hydroxide solution, and the PH of water in the pretreatment water tank is maintained to be 8.0-9.0;
2) Starting a spray water circulation pipeline of the washing tower, a spray water circulation pipeline of the primary biological deodorization device and a circulating water pump of the spray water circulation pipeline of the secondary biological deodorization device, and adjusting the circulating water flow to 25m 3 /h；
3) VOCs waste gas is introduced into the washing tower, and is introduced into the exhaust barrel through the fan for discharge after being treated by the washing tower, the primary biological deodorization device, the secondary biological deodorization device and the advanced treatment device in sequence.
Comparison test:
VOCs waste gas is treated by 20000m 3 The flow rate/h was compared with the purification methods of example 2 and comparative example 1, respectively, and the structures of the washing tower, the primary biological deodorization device, the secondary biological deodorization device, the advanced treatment device, the pretreatment water tank, the primary water tank, the secondary water tank, the fan and the exhaust pipe in comparative example 1 were the same as those in example 2. The results of comparison are shown in Table 1, table 2 shows that the VOCs waste gas is mainly containedAnd measuring the content of the organic pollutants.
TABLE 1 comparison of VOCs discharge concentration
TABLE 2 determination of the content of Main organic pollutants in VOCs exhaust gas
| Detecting items | First measurement (mg/m) 3 ） | Second measurement (mg/m) 3 ） | Third measurement (mg/m) 3 ） |
| Acetone (acetone) | 12 | 12.7 | 9.56 |
| Isopropyl alcohol | 0.062 | 0.039 | 0.03 |
| N-hexane | 1.33 | 12.4 | 8.34 |
| Acetic acid ethyl ester | 0.06 | 0.248 | 0.197 |
| Hexamethyldisiloxane | 0.054 | 0.05 | 0.023 |
| Benzene | 222 | 855 | 825 |
| N-heptane | 0.617 | 10.9 | 6.91 |
| 3-pentanone | 0.008 | 0.18 | 0.091 |
| Toluene (toluene) | 0.104 | 0.07 | 0.057 |
| Butyl acetate | ND | 0.009 | 0.008 |
| Cyclopentanone (CNG) | 0.018 | 0.024 | 0.016 |
| Lactic acid ethyl ester | ND | ND | ND |
| Ethylbenzene (ethylbenzene) | 0.021 | 0.045 | 0.034 |
| Propylene glycol monomethyl ether acetate | ND | ND | ND |
| Para-meta-xylene | 0.027 | 0.032 | 0.02 |
| Ortho-xylene | 0.017 | 0.024 | 0.012 |
| Styrene | 0.023 | 0.027 | 0.011 |
| 2-heptanone | ND | ND | ND |
| Anisole (anisole) | ND | ND | ND |
| 1-decene | 0.031 | 0.034 | 0.013 |
| Benzaldehyde | ND | ND | ND |
| 2-nonone | ND | ND | ND |
| 1-dodecene | ND | ND | ND |
| VOCs | 236 | 892 | 850 |
Note that: "ND" means: the detection limit is less than or equal to the detection limit.
The above-described embodiments are merely preferred embodiments of the present invention, and the present invention is not limited in any way, and other variations and modifications may be made without departing from the technical aspects set forth in the claims.
In the description of the present invention, it should be understood that the terms "orientation" or "positional relationship" are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and to simplify the description, rather than to indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.
Claims (5)
1. The utility model provides a VOCs exhaust gas purification system who contains high concentration aromatic hydrocarbon, includes scrubbing tower, one-level biological deodorizing device, second grade biological deodorizing device, advanced treatment unit, fan and the aiutage that connects gradually, the VOCs exhaust gas pipeline is connected to the scrubbing tower air inlet, scrubbing tower, one-level biological deodorizing device and second grade biological deodorizing device all are equipped with spray water circulation pipeline, its characterized in that: the device also comprises an activation energy generating device for providing activation energy gas, wherein the spray water circulation pipeline of the washing tower is connected with the pretreatment water tank and the first activation catalytic device, the spray water circulation pipeline of the primary biological deodorization device is connected with the primary water tank and the second activation catalytic device, the second-stage biological deodorization device is connected with a second-stage water tank and a third activation catalytic device on a spray water circulation pipeline, and the activation energy generating device is respectively connected with the first activation catalytic device, the second activation catalytic device and the third activation catalytic device;
the first activation catalytic device, the second activation catalytic device and the third activation catalytic device have the same structure, the first activation catalytic device comprises a shell, a magnetic grid inlet and a magnetic grid outlet are respectively arranged at the left end and the right end of the shell, three groups of electrode frames are respectively arranged between the magnetic grid inlet and the magnetic grid outlet in the shell, a catalytic area is arranged between each group of electrode frames, a catalyst is filled in the catalytic area, electrode plates in the electrode frames are connected with an external distribution box through an electrode guide rod, gas micropore distributors are arranged below the electrode frames in the shell and below the catalytic area, each gas micropore distributor comprises a main pipe, a circulating branch pipe is connected outside the main pipe in a penetrating way, an air inlet of the main pipe is connected with an activation energy generating device, and a plurality of exhaust ports are uniformly distributed on the main pipe and the circulating branch pipe;
the first activation catalytic device is connected to a connecting pipeline between the outlet of the pretreatment water tank and the spray water inlet of the washing tower, the second activation catalytic device is connected to a connecting pipeline between the outlet of the first water tank and the spray water inlet of the first biological deodorization device, and the third activation catalytic device is connected to a connecting pipeline between the outlet of the second water tank and the spray water inlet of the second biological deodorization device;
the pretreatment water tank, the primary water tank and the secondary water tank are all provided with an activated water circulation pipeline, a fourth activated catalytic device is connected to the activated water circulation pipeline of the pretreatment water tank, a fifth activated catalytic device is connected to the activated water circulation pipeline of the primary water tank, a sixth activated catalytic device is connected to the activated water circulation pipeline of the secondary water tank, the structures of the fourth activated catalytic device, the fifth activated catalytic device and the sixth activated catalytic device are the same as those of the first activated catalytic device, and the activated energy generating device is respectively connected with the fourth activated catalytic device, the fifth activated catalytic device and the sixth activated catalytic device;
the activation energy gas comprises a purge factor, the purge factor comprising: e, e - Hydroxyl radical, ozone, nascent oxygen, H 2 And a mixture of electron-carrying gas molecules and atoms.
2. The high-concentration aromatic hydrocarbon-containing VOCs exhaust gas purification system according to claim 1, wherein: and the three groups of electrode frames form a weak current mixed electric field after being connected with a direct current power supply.
3. The high-concentration aromatic hydrocarbon-containing VOCs exhaust gas purification system according to claim 1, wherein: and the spray water circulation pipeline and the activated water circulation pipeline are both provided with circulating water pumps.
4. The high-concentration aromatic hydrocarbon-containing VOCs exhaust gas purification system according to claim 1, wherein: and guide barrels are connected outside the magnetic grid inlet and the magnetic grid outlet.
5. An exhaust gas purifying method of the high-concentration aromatic hydrocarbon-containing VOCs exhaust gas purifying system according to any one of claims 1 to 4, comprising the steps of:
1) Filling reclaimed water into the pretreatment water tank, the primary water tank and the secondary water tank, starting a pretreatment water tank activation water circulation pipeline, a circulating water pump on the primary water tank activation water circulation pipeline and the secondary water tank activation water circulation pipeline, starting a fourth activation catalysis device, a fifth activation catalysis device and a sixth activation catalysis device, and adjusting the voltage of a weak electric mixed electric field to be 12-36V and the current to be 1-2A;
2) Adding alkali liquor into the pretreatment water tank, and maintaining the pH value of reclaimed water in the pretreatment water tank to be 8.0-9.0;
3) Starting a spray water circulation pipeline of the washing tower, a spray water circulation pipeline of the primary biological deodorization device and a circulating water pump of the spray water circulation pipeline of the secondary biological deodorization device, and adjusting the circulating water flow to 20-25 m 3 Starting the first activation catalytic device, the second activation catalytic device and the third activation catalytic device, and adjusting the voltage of the weak electric mixed electric field to be 12-36V and the current to be 1-2A;
4) The activation energy generating device is started to provide activation energy gas for the first activation catalytic device, the second activation catalytic device, the third activation catalytic device, the fourth activation catalytic device, the fifth activation catalytic device and the sixth activation catalytic device respectively, and the air supply amounts are respectively 1.0-2.0 m 3 And/h, the activation energy gas comprises a purification factor, and the purification factor comprises: e, e - Hydroxyl radical, ozone, nascent oxygen, H 2 And a mixture of gas molecules and atoms carrying electrons, wherein the activation energy gas respectively enters the first activation catalytic device to the sixth activation catalytic device through the gas micropore distributor;
5) VOCs waste gas is introduced into the washing tower, part of the waste gas is entrained and absorbed by spray water in the washing tower and enters a pretreatment water tank, then enters a first activation catalytic device and a fourth activation catalytic device through a spray water circulation pipeline and an activation water circulation pipeline, weak electric mixing electric fields in the first activation catalytic device and the fourth activation catalytic device are used for carrying out catalytic decomposition on the entrained insoluble waste gas in the spray water, so that the stability of the waste gas is destroyed, the catalyst in the catalytic region is used for carrying out further catalytic decomposition on the entrained insoluble waste gas, the waste gas which is not entrained, absorbed and escaped by the spray water enters a first-stage biological deodorization device, after being sprayed by the spray water in the device, the insoluble waste gas entrained by the spray water is catalyzed and decomposed by a second activation catalytic device and a fifth activation catalytic device, and the waste gas which is not entrained, absorbed and escaped by the spray water is subjected to biological degradation in the first-stage biological deodorization device; after the biodegraded waste gas enters a secondary biological deodorization device and is sprayed by spray water in the device, the indissolvable waste gas carried by the spray water is catalyzed and decomposed by a third activation and catalysis device and a sixth activation and catalysis device through water circulation, and the waste gas which is not carried, absorbed and escaped by the spray water is biodegraded in the secondary biological deodorization device; and the waste gas after biodegradation enters an advanced treatment device, and the waste gas is discharged after advanced treatment.
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| CN203048653U (en) * | 2012-11-07 | 2013-07-10 | 河海大学 | Equipment for efficiently processing refractory organic wastewater |
| CN204841398U (en) * | 2015-08-18 | 2015-12-09 | 杭州中兵环保股份有限公司 | Degradation device who contains low concentration VOCs waste gas |
| CN108609798A (en) * | 2018-06-20 | 2018-10-02 | 北京市惠全成环境治理工程有限责任公司 | A kind of activity magnetic catalytic separation device |
| CN110013760A (en) * | 2019-03-15 | 2019-07-16 | 江门市依潺环保科技有限公司 | A kind of method that electrocatalytic oxidation administers VOCs |
| CN112843992A (en) * | 2020-12-25 | 2021-05-28 | 深圳德蓝生态环境有限公司 | VOCs waste gas treatment system and treatment method |
| CN215048905U (en) * | 2021-05-20 | 2021-12-07 | 江苏羟源环能科技有限公司 | Treatment system for electrocatalysis coupling ozone micro-aeration |
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