CN112691513A - VOC waste gas pretreatment system and technology - Google Patents
VOC waste gas pretreatment system and technology Download PDFInfo
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- CN112691513A CN112691513A CN202011398304.XA CN202011398304A CN112691513A CN 112691513 A CN112691513 A CN 112691513A CN 202011398304 A CN202011398304 A CN 202011398304A CN 112691513 A CN112691513 A CN 112691513A
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- 239000002912 waste gas Substances 0.000 title claims abstract description 60
- 238000005516 engineering process Methods 0.000 title description 2
- 238000005406 washing Methods 0.000 claims abstract description 88
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 53
- 239000007789 gas Substances 0.000 claims abstract description 52
- 238000004065 wastewater treatment Methods 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 29
- 238000001816 cooling Methods 0.000 claims abstract description 16
- 238000011084 recovery Methods 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 3
- 239000003960 organic solvent Substances 0.000 claims description 20
- 239000002904 solvent Substances 0.000 claims description 15
- 239000003507 refrigerant Substances 0.000 claims description 6
- 239000002351 wastewater Substances 0.000 claims description 6
- 239000010865 sewage Substances 0.000 abstract description 20
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 57
- 239000012855 volatile organic compound Substances 0.000 description 50
- 239000002826 coolant Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 239000002250 absorbent Substances 0.000 description 4
- 230000002745 absorbent Effects 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 244000005700 microbiome Species 0.000 description 4
- 239000010815 organic waste Substances 0.000 description 4
- 239000010802 sludge Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 238000005273 aeration Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000000813 microbial effect Effects 0.000 description 2
- 235000015097 nutrients Nutrition 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000001546 nitrifying effect Effects 0.000 description 1
- 238000006864 oxidative decomposition reaction Methods 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1406—Multiple stage absorption
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1412—Controlling the absorption process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1487—Removing organic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/305—Nitrification and denitrification treatment characterised by the denitrification
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/10—Inorganic absorbents
- B01D2252/103—Water
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/20—Organic absorbents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- 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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
Abstract
A VOC waste gas pretreatment system and a process thereof, wherein the system comprises an exhaust fan, a gas heat exchanger, a washing tower and a water washing tower; the exhaust fan is connected with the gas heat exchanger, and the exhaust end of the gas heat exchanger is connected with the lower end of the water washing tower; the lower end of the gas heat exchanger is connected with the lower end of the washing tower, and the upper end of the washing tower is connected with the lower end of the gas heat exchanger; the exhaust end of the water washing tower is communicated with the waste gas treatment unit; the lower end of the water washing tower is communicated with a biochemical wastewater treatment device through a liquid-rich pump. The process comprises a recovery step, a cooling step, a deep cooling washing step and a secondary washing step. The invention has the advantages that the pretreatment system changes the high-concentration VOC waste gas into the low-concentration VOC waste gas, and simultaneously, the terminal sewage device is used for consuming excrement generated by the pretreated VOC waste gas, thereby realizing zero emission and laying a good foundation for the complete treatment of the subsequent VOC waste gas.
Description
Technical Field
The invention relates to a VOC waste gas pretreatment process, in particular to a VOC waste gas pretreatment system and a VOC waste gas pretreatment process.
Background
The national society pays more and more attention to the protection of the atmospheric environment. GB 37822-2019 volatile organic compound unorganized emission control standard issued in 2019 is officially implemented in 7/1 of 2020. Volatile Organic Compounds (VOCs) have to be treated inorganically. A common VOC organic waste gas purification treatment method comprises the following steps: preferably selects the waste gas purification treatment method which has high safety, is not easy to cause explosion, has low energy consumption and has no secondary pollution. Generally, petrochemical enterprises perform purification treatment of exhaust gas by methods such as absorption and combustion due to the particularity of their production activities, with high exhaust gas concentration. In order to ensure the safety of the treatment schemes of up-to-standard gas emission, absorption, combustion and the like, the collected and consumed VOC organic waste gas must be pretreated.
Disclosure of Invention
The invention provides a VOC waste gas pretreatment system and a treatment method, wherein the pretreatment system enables high-concentration VOC waste gas to be changed into low-concentration VOC waste gas, and simultaneously, a terminal sewage device is used for consuming excrement generated by the pre-treated VOC waste gas, so that zero emission is realized, and a good foundation is laid for the complete treatment of the subsequent VOC waste gas.
The technical scheme of the invention is that the VOC waste gas pretreatment system comprises an exhaust fan, a gas heat exchanger, a washing tower and a water washing tower;
the exhaust fan is connected with the gas heat exchanger, and the exhaust end of the gas heat exchanger is connected with the lower end of the water washing tower;
the lower end of the gas heat exchanger is connected with the lower end of the washing tower, and the upper end of the washing tower is connected with the lower end of the gas heat exchanger;
the exhaust end of the water washing tower is communicated with the waste gas treatment unit;
the lower end of the water washing tower is communicated with the biochemical wastewater treatment device through a liquid-rich pump.
Further, VOC waste gas pretreatment system still includes the cryogenic cooler, the scrubbing tower upper end pass through the cryogenic cooler with the gas heat exchanger lower extreme is connected.
Furthermore, the solvent used by the washing tower is a water-soluble organic solvent.
And further, a COD data acquisition sensor is arranged in the biochemical wastewater treatment device, the acquisition sensor is connected with the deep cooler medium supply equipment through a controller, and the controller controls the medium supply quantity of the deep cooler medium supply equipment to the deep cooler according to the data of the acquisition sensor.
Furthermore, the biochemical wastewater treatment device is connected with the upper part of the water washing tower through a water return pump.
The VOC waste gas pretreatment process comprises a recovery step, a cooling step, a deep cooling washing step and a secondary washing step;
the recovery step is to centralize or collect the VOC waste gas;
the temperature reduction step is to carry out primary temperature reduction on the VOC waste gas;
the deep cooling washing step is to input the cooled VOC waste gas into a washing tower, use a water-soluble organic solvent in the washing tower, and enter the secondary washing step after the VOC waste gas is deeply processed by a deep cooler after being contacted with the water-soluble organic solvent;
and in the secondary washing step, water is used as a solvent in a water washing tower, the VOC waste gas is discharged after contacting with the water, the water is collected and flows back to a biochemical wastewater treatment device, and the biochemical wastewater treatment device recovers the water-soluble organic solvent.
And further, the biochemical wastewater treatment device adopts a biochemical treatment mode for treatment.
Furthermore, in the deep cooling washing step, the temperature of the VOC waste gas is between 70 ℃ below zero and 40 ℃ after being cooled by a deep cooler. .
Furthermore, the refrigerant usage amount of the deep cooler is adjusted according to the total COD of the external wastewater received by the biochemical wastewater treatment device.
Furthermore, the deep cooler adjusts the loss amount of the water-soluble organic solvent of the washing tower through the amount of the refrigerant, and controls the amount of the water-soluble organic solvent brought into the biochemical wastewater treatment device.
The invention has the advantages that 1, the invention relates to a VOC waste gas pretreatment system and a VOC waste gas pretreatment process, which can effectively reduce the concentration of VOC waste gas, reduce the concentration of the waste gas from 200g/m3 to below 10g/m3, ensure the safe and stable operation of post-treatment equipment, and ensure the standard discharge.
2. VOC waste gas pretreatment system and process: according to the requirement, the components in the waste gas can be recovered, and the recovery rate reaches 99%.
3. VOC waste gas pretreatment system and process: can effectively capture part of the waste gas with high melting point. The problem of blocking the pretreatment equipment after condensation does not exist.
4. VOC waste gas pretreatment system and process: no secondary waste gas (washing absorption solvent) is generated, the concentration of volatilized solvent is controllable (1-17% volume fraction), and the volatilized solvent can be absorbed by the reclaimed water.
5. VOC waste gas pretreatment system and process: fresh water is not used, and reclaimed water treated by a biochemical sewage device is used as an absorbent, so that no additional waste water is generated.
6. VOC waste gas pretreatment system and process: the washing absorption solvent (methanol) absorbed by water is a carbon source of the biochemical sewage device and the activated sludge, and can effectively reduce the methanol consumption of the biochemical sewage device.
7. VOC waste gas pretreatment system and process: is favorable for the stable operation of the biochemical sewage device. The amount of absorbent off-gas entering the water scrubber can be controlled by the chiller. The required amount of the washing absorbent as the carbon source is determined by the operation condition of the biochemical sewage device. The optimal balance of cold energy, the loss amount of the washing solvent and the biochemical sewage device is achieved. Ensures that the biochemical sewage device runs stably under the condition that COD of the biochemical sewage device fluctuates.
Drawings
Fig. 1 is a schematic diagram of a VOC exhaust gas pretreatment system.
FIG. 2 is a schematic view of a VOC waste gas pretreatment system.
Fig. 3 is a schematic diagram of the preferred structure of fig. 1.
As shown in the figure, an exhaust fan 1, a gas heat exchanger 2, a washing tower 3, a deep cooler 4, a water washing tower 5, a rich liquor pump 6, a biochemical wastewater treatment device 7, a water return pump 8, a data acquisition sensor 9, a controller 10, a deep cooler medium supply device 11, a recovery step A, a cooling step B, a deep cooling washing step C and a secondary washing step D.
Detailed Description
As shown in fig. 1, a VOC exhaust gas pretreatment system includes an exhaust fan 1, a gas heat exchanger 2, a scrubber 3, a water scrubber 5; the exhaust fan 1 is connected with the gas heat exchanger 2, the exhaust end of the gas heat exchanger 2 is connected with the lower end of the water washing tower 5, preferably, the VOC waste gas pretreatment system further comprises a deep cooler 4, the upper end of the washing tower 3 is connected with the lower end of the gas heat exchanger 2 through the deep cooler 4, and the VOC waste gas passing through the gas heat exchanger 2 is cooled by using cold air discharged by the deep cooler 4;
the lower end of the gas heat exchanger 2 is connected with the lower end of the washing tower 3, and the upper end of the washing tower 3 is connected with the lower end of the gas heat exchanger 2;
the exhaust end of the water washing tower 5 is communicated with an exhaust gas treatment unit;
the lower end of the water washing tower 5 is communicated with the biochemical wastewater treatment device 7 through a rich liquor pump 6, preferably, the biochemical wastewater treatment device 7 is connected with the upper part of the water washing tower 5 through a water return pump 8, and the water washing tower 5 is connected with the biochemical wastewater treatment device 7, the rich liquor pump 6, the water return pump 8 and a pipeline to form an absorbent loop.
Preferably, the solvent used in the washing tower is a water-soluble organic solvent, and further preferably, the water-soluble organic solvent is one or a combination of alcohols.
Preferably, as shown in fig. 3, a COD data collecting sensor 9 is disposed in the biochemical wastewater treatment device 7, the COD data collecting sensor 9 collects the concentration of COD in the biochemical wastewater treatment device 7 in real time, the collecting sensor 9 is connected to the chiller medium supply device 11 through a controller 10, the controller 10 controls the medium supply amount of the chiller medium supply device 11 to the chiller 4 according to the data of the collecting sensor 9, the supply amount of the medium increased by the chiller medium supply device 11 increases the absolute temperature reduction of the chiller 4, the supply amount of the medium decreased by the chiller medium supply device 11 decreases the absolute temperature reduction of the chiller 4, COD is chemical oxygen demand, which is the amount of oxidant consumed by oxidative decomposition of reducing substances in water under the action of an additional strong oxidant under a certain strict condition, expressed by mg/L of oxygen, if COD indicates that organic matter content is high, if the COD is low, the organic matter content is low.
As shown in fig. 2, the VOC exhaust gas pretreatment process includes a recovery step a, a temperature reduction step B, a cryogenic washing step C, and a secondary washing step D;
the recovery step A is to concentrate or collect the VOC waste gas and concentrate or collect the VOC waste gas by using an exhaust fan 1;
in the cooling step B, the VOC waste gas is cooled for the first time, generally the VOC waste gas is cooled by more than 35% by using the gas heat exchanger 2, and the cooling can be adjusted according to the process requirement;
the deep cooling washing step C is to input the cooled VOC waste gas into a washing tower 3, a water-soluble organic solvent is used in the washing tower 3, the VOC waste gas is contacted with the water-soluble organic solvent, then the VOC waste gas is deeply processed by a deep cooler 4 and then enters the secondary washing step C, and the preferable VOC waste gas is cooled by the deep cooler 4 and then is at the temperature of-70 ℃ to 40 ℃;
in the secondary washing step D, water acts on the solvent in the water washing tower 5, the VOC exhaust gas is discharged after contacting the water, the water is collected and returned to the biochemical wastewater treatment device 7, the biochemical wastewater treatment device 7 recovers the water-soluble organic solvent, preferably, the biochemical wastewater treatment device 7 adopts a biochemical treatment mode to treat, and the biochemical treatment mode is as follows: the A/O process is also called anaerobic-aerobic process, and the anaerobic section is mainly used for treating few nitrogen oxides in the wastewater by nitrifying bacteria without aeration. The aerobic section mainly treats organic matters (such as methanol) by bacterial microorganisms, air is required to be introduced for aeration, the biochemical treatment of the biochemical wastewater treatment device 7 is realized by using the methanol, and the water-soluble organic solvent (methanol) added into the washing tower 3 in the deep cooling washing step C can be consumed in the biochemical treatment process of the biochemical wastewater treatment device 7, so that the environmental pollution is avoided.
Preferably, the usage amount of the refrigerant of the deep cooler 4 is adjusted according to the total COD of the external wastewater received by the biochemical wastewater treatment device 7, and the deep cooler 4 adjusts the loss amount of the water-soluble organic solvent (methanol) of the washing tower 3 according to the usage amount of the refrigerant, so as to control the amount of the water-soluble organic solvent brought into the biochemical wastewater treatment device 7. The working principle is that when the factory production is stable and the content of sewage organic matters (COD) received by the biochemical wastewater treatment device 7 of the sewage treatment station is low (namely less than or equal to a set value), in order to maintain the normal population quantity of microorganisms, organic matters such as methanol and the like are required to be manually put in as nutrients of active microorganisms, so that the consumption of a cooling medium of the deep cooler 4 can be reduced, the temperature of gas entering the water washing tower 5 from the exhaust end of the washing tower 3 is increased, the quantity of condensed reflux solvent (methanol) is reduced, the quantity of solvent (methanol) brought into the water washing tower 5 is increased, and the COD of water entering the biochemical wastewater treatment device 7 from the water washing tower 5 is increased; if the content of sewage organic matters (COD) received by the sewage treatment station is increased (namely when the content is larger than a set value), organic matters such as methanol and the like do not need to be manually put in as nutrients of active microorganisms, the using amount of a cooling medium of the deep cooler 4 can be increased, the temperature of gas entering the water washing tower 5 from the exhaust end of the washing tower 3 is raised, the amount of a solvent (methanol) in condensation reflux is increased, the amount of the solvent (methanol) brought into the water washing tower 5 is reduced, and the COD of water entering the biochemical wastewater treatment device 7 from the water washing tower 5 is reduced.
The COD content in the biochemical wastewater treatment device 7 is subjected to data acquisition through an artificial or inductor and then is conveyed to a control unit of the coolant amount of the deep cooler 4 in a remote wireless or wired or artificial mode, if the COD content is less than a set value, the coolant amount of the deep cooler 4 is reduced to increase the temperature of the gas discharged by the washing tower 3 and increase the methanol discharge amount, so that the methanol entering the biochemical wastewater treatment device 7 is increased, the methanol is added into the biochemical wastewater treatment device 7, the normal microbial population of the biochemical wastewater treatment device 7 is maintained, if the COD content is more than the set value, the coolant amount of the deep cooler 4 is increased to reduce the temperature of the gas discharged by the washing tower 3 and reduce the methanol discharge amount, the biochemical wastewater entering the biochemical wastewater treatment device 7 is reduced, and the biochemical wastewater treatment device 7 does not need to increase the methanol to maintain the normal microbial population of the biochemical wastewater treatment device The number of the cells.
A VOC waste gas pretreatment system and a process are suitable for high-concentration or easily solidified or post-treated VOC organic waste gas which is not easy to reach the standard and is qualified. Chemical enterprises are provided with terminal sewage devices, the terminal sewage devices mostly adopt a biochemical treatment (activated sludge) process, and when COD (chemical oxygen demand) of the activated sludge in sewage is low, organic matters such as methanol and the like are required to be put in as carbon sources. In combination with a biochemical sewage treatment device, methanol is required to be consumed as a carbon source of the activated sludge, and the biochemical sewage treatment device is required to discharge reclaimed water. The washing tower and the water washing tower are integrated with a biochemical sewage treatment device, and the environment-friendly, efficient and reliable VOC organic waste gas pretreatment process is developed.
Claims (10)
1. The utility model provides a VOC waste gas pretreatment system which characterized in that: the system comprises an exhaust fan, a gas heat exchanger, a washing tower and a water washing tower;
the exhaust fan is connected with the gas heat exchanger, and the exhaust end of the gas heat exchanger is connected with the lower end of the water washing tower;
the lower end of the gas heat exchanger is connected with the lower end of the washing tower, and the upper end of the washing tower is connected with the lower end of the gas heat exchanger;
the exhaust end of the water washing tower is communicated with the waste gas treatment unit;
the lower end of the water washing tower is communicated with the biochemical wastewater treatment device through a liquid-rich pump.
2. A VOC exhaust gas pretreatment system according to claim 1, wherein: the system also comprises a deep cooler, and the upper end of the washing tower is connected with the lower end of the gas heat exchanger through the deep cooler.
3. A VOC exhaust gas pretreatment system according to claim 1, wherein: the solvent used by the washing tower is water-soluble organic solvent.
4. A VOC exhaust pretreatment system according to claim 2, wherein: setting up COD data acquisition inductor in the biochemical wastewater treatment device, the acquisition inductor pass through the controller with the deep cooler medium supply equipment be connected, the controller is according to gathering inductor data control deep cooler medium supply equipment to the medium supply volume of deep cooler.
5. A VOC exhaust gas pretreatment system according to claim 1, wherein: the biochemical wastewater treatment device is connected with the upper part of the water washing tower through a water return pump.
6. A VOC exhaust gas pretreatment process using a VOC exhaust gas pretreatment system according to any one of claims 1 to 5, wherein: the treatment process comprises a recovery step, a cooling step, a deep cooling washing step and a secondary washing step;
the recovery step is to centralize or collect the VOC waste gas;
the temperature reduction step is to carry out primary temperature reduction on the VOC waste gas;
the deep cooling washing step is to input the cooled VOC waste gas into a washing tower, use a water-soluble organic solvent in the washing tower, and enter the secondary washing step after the VOC waste gas is deeply processed by a deep cooler after being contacted with the water-soluble organic solvent;
and in the secondary washing step, water is used as a solvent in a water washing tower, the VOC waste gas is discharged after contacting with the water, the water is collected and flows back to a biochemical wastewater treatment device, and the biochemical wastewater treatment device recovers the water-soluble organic solvent.
7. A VOC exhaust gas pretreatment as claimed in claim 6, wherein: the biochemical wastewater treatment device adopts a biochemical treatment mode for treatment.
8. A VOC exhaust gas pretreatment process according to claim 6, characterized by: in the deep cooling washing step, the temperature of the VOC waste gas is between 70 ℃ below zero and 40 ℃ after being cooled by a deep cooler.
9. A VOC exhaust gas pretreatment process according to claim 6, characterized by: the refrigerant usage amount of the deep cooler is adjusted according to the total COD of the external wastewater received by the biochemical wastewater treatment device.
10. A VOC exhaust gas pretreatment process according to claim 6, characterized by: the deep cooler adjusts the loss amount of the water-soluble organic solvent of the washing tower through the amount of the refrigerant, and controls the amount of the water-soluble organic solvent brought into the biochemical wastewater treatment device.
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| CN202011398304.XA CN112691513A (en) | 2020-12-03 | 2020-12-03 | VOC waste gas pretreatment system and technology |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023117754A1 (en) | 2021-12-23 | 2023-06-29 | Röhm Gmbh | Process for producing alkyl methacrylates with higher yields and reduced emissions of volatile organic compounds |
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