CN112058021A - Low-temperature methanol washing tail gas VOCs treatment method and device - Google Patents
Low-temperature methanol washing tail gas VOCs treatment method and device Download PDFInfo
- Publication number
- CN112058021A CN112058021A CN202010801911.XA CN202010801911A CN112058021A CN 112058021 A CN112058021 A CN 112058021A CN 202010801911 A CN202010801911 A CN 202010801911A CN 112058021 A CN112058021 A CN 112058021A
- Authority
- CN
- China
- Prior art keywords
- tower
- washing
- tail gas
- pipeline
- washing tower
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005406 washing Methods 0.000 title claims abstract description 134
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 title claims abstract description 129
- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000002351 wastewater Substances 0.000 claims abstract description 30
- GBMDVOWEEQVZKZ-UHFFFAOYSA-N methanol;hydrate Chemical compound O.OC GBMDVOWEEQVZKZ-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000000926 separation method Methods 0.000 claims abstract description 7
- 238000001514 detection method Methods 0.000 claims abstract description 4
- 238000007599 discharging Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 68
- 239000007788 liquid Substances 0.000 claims description 26
- 230000001105 regulatory effect Effects 0.000 claims description 23
- 238000010521 absorption reaction Methods 0.000 claims description 13
- 230000008859 change Effects 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 10
- 238000005201 scrubbing Methods 0.000 claims description 10
- 238000007667 floating Methods 0.000 claims description 8
- 238000010612 desalination reaction Methods 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 65
- 239000000126 substance Substances 0.000 abstract description 6
- 239000002912 waste gas Substances 0.000 abstract description 5
- 230000002745 absorbent Effects 0.000 abstract description 4
- 239000002250 absorbent Substances 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 125000004122 cyclic group Chemical group 0.000 abstract 1
- 238000011033 desalting Methods 0.000 description 6
- 239000002253 acid Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 238000004868 gas analysis Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 206010010071 Coma Diseases 0.000 description 1
- 206010011224 Cough Diseases 0.000 description 1
- 206010019233 Headaches Diseases 0.000 description 1
- 206010019851 Hepatotoxicity Diseases 0.000 description 1
- 206010047700 Vomiting Diseases 0.000 description 1
- 231100000570 acute poisoning Toxicity 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000001299 aldehydes Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 231100000739 chronic poisoning Toxicity 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 208000002173 dizziness Diseases 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 231100000869 headache Toxicity 0.000 description 1
- 230000007686 hepatotoxicity Effects 0.000 description 1
- 231100000304 hepatotoxicity Toxicity 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 210000004185 liver Anatomy 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 210000000653 nervous system Anatomy 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 238000006864 oxidative decomposition reaction Methods 0.000 description 1
- 239000010908 plant waste Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 208000024891 symptom Diseases 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/20—Organic absorbents
- B01D2252/202—Alcohols or their derivatives
- B01D2252/2021—Methanol
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention belongs to the technical field of waste gas treatment of chemical plants, and particularly relates to a method and a device for treating VOCs (volatile organic compounds) in low-temperature methanol washing tail gas, which comprises a washing tower, wherein a waste water pipeline for discharging waste water is arranged at the bottom of the washing tower, a tower bottom temperature measuring element is arranged at the bottom of the washing tower, the detection end of the tower bottom temperature measuring element extends into the washing tower, the tower bottom temperature measuring element is fixedly connected with the washing tower, and the tail gas pipeline is connected to the lower part of the lowest layer tower plate of the washing tower; the device is washed to low temperature methyl alcohol influence is less, and the methyl alcohol in the waste water can be retrieved and circulate to low temperature methyl alcohol through methyl alcohol water separation unit and wash the unit reuse, and whole equipment area is little, and the throughput is good, adopts the device that the washing method was handled VOCs, absorbent cyclic utilization, and the working costs is little, and the energy consumption is little, and disposable investment is low, has better economic advantages.
Description
Technical Field
The invention belongs to the technical field of chemical plant waste gas treatment, and particularly relates to a method and a device for treating VOCs (volatile organic compounds) in low-temperature methanol washing tail gas.
Background
VOCs are organic compounds that are easily volatile at room temperature. The Volatile Organic Compounds (VOCs) are mainly in incomplete combustion in a chemical process, process discharge of a chemical preparation unit, oil volatilization, volatilization in a solvent use process and the like, and common VOCs are hydrocarbons, benzene systems, aldehydes and alcohols. When the concentration of VOCs in the air is too high, acute poisoning is easily caused, mild patients can have symptoms such as headache, dizziness, cough, nausea and vomiting, severe patients can cause hepatotoxicity or even coma, and chronic poisoning and damage to the liver and nervous system can be caused in long-term life under the environment.
The treatment method of VOCs mainly takes preventive measures for mainly preventing leakage and treatment process measures for mainly treating tail ends, and common treatment technologies comprise process substitution, oxidative decomposition, biodegradation, absorption and adsorption.
The method is characterized in that the coal-to-synthesis gas is a first step for preparing chemical products by taking coal as a raw material, the raw synthesis gas contains a large amount of redundant acid gases such as CO2, a small amount of H2S and COS, the acid gases are unfavorable for production and need to be removed, low-temperature methanol washing is an important operation unit in the coal chemical industry process, the core function of the method is an acid gas removal technology, methanol is mainly used as an absorbent, the excellent characteristic that the methanol has extremely high solubility on the acid gases (CO2, H2S, COS and the like) at low temperature is utilized to remove the acid gases in the raw material gas, the product gas rich in CO2 and separated in the low-temperature absorption and washing process contains a large amount of methanol, the methanol in the tail gas belongs to the VOCs treatment category, a large amount of methanol can be recycled through the VOCs treatment technology, and the VOCs in the tail gas can be treated at the same time to.
Disclosure of Invention
To solve the problems set forth in the background art described above. The invention provides a method and a device for treating VOCs in low-temperature methanol washing tail gas, and has the characteristics of reliable process performance, convenience in operation and wide application prospect.
In order to achieve the purpose, the invention provides the following technical scheme: a low-temperature methanol washing tail gas VOCs treatment device comprises a washing tower, wherein a waste water pipeline for discharging waste water is arranged at the bottom of the washing tower, a tower bottom temperature measuring element is arranged at the bottom of the washing tower, the detection end of the tower bottom temperature measuring element extends into the washing tower, the tower bottom temperature measuring element is fixedly connected with the washing tower, the tail gas pipeline is connected below the lowest layer of a tower plate of the washing tower, the end part of the tail gas pipeline penetrates through the washing tower and is fixedly connected with the washing tower, a layer-by-layer downcomer is arranged in the washing tower, namely, the upper part of the tail gas pipeline is close to the inner part of the washing tower, the downcomer is fixedly connected with the washing tower and is connected with a float valve tower plate, the float valve tower plate is fixed in the washing tower, a wire mesh demister is arranged above the float valve tower plate, and is fixedly arranged on the inner side wall of the washing tower, the water washing device comprises a water washing tower, a water outlet pipeline and a water outlet pipeline, wherein the top end of the outer side wall of the water washing tower is provided with a desalting water pipeline, the desalting water pipeline is positioned between a floating valve tower plate and a wire mesh demister, the desalting water pipeline is fixedly connected with the water washing tower, the top of the water washing tower is provided with the air outlet pipeline, and the air outlet pipeline is fixedly connected with the water washing tower.
Preferably, the input of waste water pipeline is equipped with the tower bottom drain pump, the tower bottom drain pump and external power source electric connection, just the tower bottom drain pump with waste water pipeline sealing connection, the input of tower bottom drain pump is equipped with waste water pipeline flow control valve, waste water pipeline flow control valve with the tower bottom drain pump electric connection.
Preferably, be equipped with pressure differential liquid level transmitter on the bottom lateral wall of washing tower, pressure differential liquid level transmitter's input, output all run through the washing tower to stretch into extremely the inside of washing tower, pressure differential liquid level transmitter with washing tower fixed connection.
Preferably, the input end of the tail gas pipeline is provided with a tail gas pipeline flow regulating valve, and the tail gas pipeline flow regulating valve is fixedly connected with the tail gas pipeline.
Preferably, be equipped with pressure transmitter at the bottom of the tower on the bottom lateral wall of washing tower, pressure transmitter at the bottom of the tower with washing tower fixed connection, pressure transmitter and external power source electric connection at the bottom of the tower.
Preferably, the output end of the desalted water pipeline is provided with a desalted water pipeline flow regulating valve, the desalted water pipeline flow regulating valve is fixedly connected with the desalted water pipeline, and the desalted water pipeline flow regulating valve is electrically connected with an external power supply.
Preferably, the top of the washing tower is respectively provided with a tower top pressure transmitter and a tower top temperature measuring element, and the tower top pressure transmitter and the tower top temperature measuring element are fixedly connected with the washing tower.
Preferably, the output end of the air outlet pipeline is fixedly connected with an air outlet pipeline flow regulating valve, and the air outlet pipeline flow regulating valve is electrically connected with an external power supply.
A method for treating VOCs in low-temperature methanol washing tail gas comprises the following steps:
step S1, enabling the tail gas rich in VOCs from the low-temperature methanol washing tail gas pipeline to enter the bottom of the water washing tower, and enabling the tail gas to move from bottom to top through a valve hole of a float valve tray of the water washing tower;
step S2, enabling desalted water to enter the upper part of the water washing tower from a desalted water pipeline, enabling the desalted water to flow to the bottom of the tower from top to bottom along the S shape of the float valve tower tray and the downcomer, enabling tail gas and the desalted water to perform gas-liquid exchange on the float valve tower tray, and enabling the desalted water to absorb VOCs in the tail gas;
and S3, allowing the purified tail gas to enter a discharge system from an air outlet pipeline, allowing the wastewater at the bottom of the tower for absorbing the VOCs to enter a methanol-water separation system from a drainage pump at the bottom of the tower, arranging a pressure transmitter and a temperature measuring element at the top of the washing tower in the absorption process, arranging the pressure transmitter and the temperature measuring element at the bottom of the tower to measure the pressure change of the washing tower, the pressure drop and the temperature change of the whole tower at any time, and arranging a differential pressure liquid level transmitter at the bottom of the tower to monitor the liquid level.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the low-temperature methanol washing tail gas VOCs is applied to the washing tower for treatment, the process is simple, the operation is convenient, the environmental effect is good, the treated tail gas meets the requirements of national standards, the content of methanol in the waste gas discharged by the low-temperature methanol washing of the purification device is not more than 50mg/Nm3, the influence on the low-temperature methanol washing device is small, the methanol in the waste gas can be recovered through the methanol-water separation unit and recycled to the low-temperature methanol washing unit for reuse, the whole device has small floor area and good treatment capacity, the absorption agent is recycled by adopting the washing method to treat the VOCs, the operation cost is low, the energy consumption is low, the one-time investment is low, the economic advantage is good, the device is applied to a complete set of devices for treating the chemical tail gas with high risk, the operation condition is normal temperature, the operation hidden danger of high temperature and other safety accidents easily caused.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural diagram of the present invention.
In the figure: 1. washing the tower with water; 2. a float valve tray; 3. a downcomer; 4. a wire mesh demister; 5. a desalted water line; 6. an exhaust gas pipeline; 7. a waste water conduit; 8. an air outlet pipe; 9. a tower top pressure transmitter; 10. a tower top temperature measuring element; 11. a tower bottom pressure transmitter; 12. a tower bottom temperature measuring element; 13. a flow regulating valve of the desalted water pipeline; 14. a tail gas pipeline flow regulating valve; 15. a waste water pipeline flow regulating valve; 16. a flow regulating valve of the air outlet pipeline; 17. a tower bottom draining pump; 18. differential pressure liquid level transmitter.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides the following technical solutions: a low-temperature methanol washing tail gas VOCs treatment device comprises a washing tower 1, a waste water pipeline 7 for discharging waste water is arranged at the bottom of the washing tower 1, a tower bottom temperature measuring element 12 is arranged at the bottom of the washing tower 1, a detection end of the tower bottom temperature measuring element 12 extends into the washing tower 1, the tower bottom temperature measuring element 12 is fixedly connected with the washing tower 1, a tail gas pipeline 6 is connected below the lowermost tower plate of the washing tower 1, the end part of the tail gas pipeline 6 penetrates through the washing tower 1 and is fixedly connected with the washing tower 1, a down pipe 3 is arranged inside the washing tower 1, namely above the tail gas pipeline 6, the down pipe 3 is fixedly connected with the washing tower 1, the down pipe 3 is connected with a floating valve tower plate 2, the floating valve tower plate 2 is fixed inside the washing tower 1, a silk screen foam remover 4 is arranged above the floating valve tower plate 2, the silk screen foam remover 4 is fixedly arranged on the inner side wall of the washing tower 1, a desalting water pipeline 5 is arranged at the top end of the outer side, desalting water pipe 5 is located between float valve column plate 2, silk screen demister 4, desalting water pipe 5 and washing tower 1 fixed connection, and the top of washing tower 1 is equipped with outlet duct 8, outlet duct 8 and washing tower 1 fixed connection.
In the embodiment, a low-temperature methanol washing tail gas containing VOCs gas is absorbed by adopting an absorption method of a washing tower 1, desalted water is adopted as an absorbent to avoid introducing new impurities, the methanol in the tail gas is absorbed and washed to reduce the methanol content, so that the tail gas reaches the emission index, the washing tower 1 adopts a floating valve tower plate 2 and a single overflow arch downcomer 3 tower internal part, the low-temperature methanol washing tail gas and desalted water are in gas-liquid contact on the tower plate, the gas-liquid mass transfer effect of the floating valve tower plate 2 is good, the low-temperature methanol washing tail gas has the advantages of high absorption efficiency, large operation elasticity, strong blocking prevention capability, good treatment capability and the like, a pressure transmitter 9 and a temperature measuring element 10 are arranged at the top of the washing tower 1, a pressure transmitter 11 and a temperature measuring element 12 are arranged at the bottom of the tower to measure the pressure change, the pressure drop and the temperature change of the whole tower at any, set up flow control valve respectively at desalination pipeline 5 and tail gas pipeline 6, guarantee VOCs treatment effect and system's even running through control switch and mediation valve aperture, waste water after absorption tower 1 washing is sent into methanol-water separation tower system by tower bottom drain pump 17, absorb the methyl alcohol in the waste water, the methyl alcohol of absorption can return to low temperature methanol washing unit and recycle, CO2 product gas after the washing treatment sets up online gas analysis monitoring system before getting into the discharge system, VOCs content and treatment effect in the waste gas can real-time detection, so that in time adjustment operating parameter.
Specifically, the input of waste water pipeline 7 is equipped with tower bottom drain pump 17, and tower bottom drain pump 17 and external power source electric connection, and tower bottom drain pump 17 and waste water pipeline 7 sealing connection, the input of tower bottom drain pump 17 is equipped with waste water pipeline flow control valve 15, waste water pipeline flow control valve 15 and tower bottom drain pump 17 electric connection.
Specifically, be equipped with pressure differential liquid level transmitter 18 on the bottom lateral wall of scrubbing tower 1, the input of pressure differential liquid level transmitter 18, output all run through scrubbing tower 1 to stretch into the inside to scrubbing tower 1, pressure differential liquid level transmitter 18 and scrubbing tower 1 fixed connection.
Specifically, the input end of the tail gas pipeline 6 is provided with a tail gas pipeline flow regulating valve 14, and the tail gas pipeline flow regulating valve 14 is fixedly connected with the tail gas pipeline 6.
Specifically, be equipped with pressure transmitter 11 at the bottom of the tower on the bottom lateral wall of scrubbing tower 1, pressure transmitter 11 at the bottom of the tower and scrubbing tower 1 fixed connection, pressure transmitter 11 at the bottom of the tower and external power source electric connection.
Specifically, the output end of the desalted water pipeline 5 is provided with a desalted water pipeline flow regulating valve 13, the desalted water pipeline flow regulating valve 13 is fixedly connected with the desalted water pipeline 5, and the desalted water pipeline flow regulating valve 13 is electrically connected with an external power supply.
Specifically, a tower top pressure transmitter 9 and a tower top temperature measuring element 10 are respectively installed at the top of the water washing tower 1, and the tower top pressure transmitter 9 and the tower top temperature measuring element 10 are both fixedly connected with the water washing tower 1.
Specifically, the output end of the air outlet pipe 8 is fixedly connected with an air outlet pipe flow regulating valve 16, and the air outlet pipe flow regulating valve 16 is electrically connected with an external power supply.
Absorbing VOCs in low-temperature methanol washing tail gas by adopting a washing method, wherein an absorbent is desalted water, absorbing methanol in the tail gas and reducing the content of the VOCs in the low-temperature methanol washing tail gas so as to enable the tail gas to reach a discharge index, a washing tower 1 adopts a multi-stage float valve tower with a single overflow bow-shaped falling liquid plate, a multi-stage float valve tower plate 2 is used as an interface of gas-liquid contact mass transfer, the float valve tower has the advantages of good gas-liquid mass transfer effect, high treatment capacity and the like, meanwhile, the absorption efficiency is high, the operation elasticity is high, a tower top pressure transmitter 9 and a tower top temperature measuring element 10 are arranged at the tower bottom of the washing tower 1, the pressure change of the washing tower 1, the pressure drop and the temperature change of the whole tower are measured at any time, a differential pressure liquid level transmitter 18 is arranged at the tower bottom, the liquid level change at the tower bottom is monitored, flow regulating valves are respectively arranged at, the rich first waste water after absorption tower 1 washing is sent into methanol-water separation tower system, and the methyl alcohol in the absorption waste water can return to low temperature methyl alcohol washing unit and reuse, sets up online gas analysis monitoring system before CO2 product gas after the washing processing gets into discharge system, can detect VOCs content and treatment effect in the waste gas in real time to in time adjust operating parameter.
A method for treating VOCs in low-temperature methanol washing tail gas comprises the following steps:
step S1, enabling the tail gas rich in VOCs from the low-temperature methanol washing tail gas pipeline 6 to enter the bottom of the water washing tower 1, and enabling the tail gas to move from bottom to top through a valve hole of a float valve tower plate 2 of the water washing tower 1;
step S2, enabling desalted water to enter the upper part of a washing tower 1 from a desalted water pipeline 5, enabling the desalted water to flow to the bottom of the tower along the float tray 2 and a downcomer 3S shape from top to bottom, enabling tail gas and desalted water to carry out gas-liquid exchange on the float valve tray 2, and enabling the desalted water to absorb VOCs in the tail gas;
step S3, the purified tail gas enters a discharge system from an air outlet pipeline, the wastewater at the bottom of the tower for absorbing VOCs enters a methanol-water separation system from a drainage pump 17 at the bottom of the tower, a pressure transmitter 9 and a temperature measuring element 10 are arranged at the top of the washing tower 1 in the absorption process, a pressure transmitter 11 and a temperature measuring element 12 are arranged at the bottom of the tower to measure the pressure change of the washing tower 1, the pressure drop and the temperature change of the whole tower at any time, and a differential pressure liquid level transmitter 18 is arranged at the bottom of the tower to monitor the liquid level change at.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a tail gas VOCs processing apparatus is washed to low temperature methyl alcohol which characterized in that: comprises a washing tower (1), wherein a wastewater pipeline (7) used for discharging wastewater is arranged at the bottom of the washing tower (1), a tower bottom temperature measuring element (12) is arranged at the bottom of the washing tower (1), the detection end of the tower bottom temperature measuring element (12) extends into the washing tower (1), the tower bottom temperature measuring element (12) is fixedly connected with the washing tower (1), a tail gas pipeline (6) is arranged at the bottom end of the washing tower (1), the end part of the tail gas pipeline (6) penetrates through the washing tower (1) and is fixedly connected with the washing tower (1), a layer-by-layer downcomer (3) is arranged in the washing tower (1), namely, a space above the tail gas pipeline (6), the downcomer (3) is fixedly connected with the washing tower (1), the downcomer (3) is connected with a float valve (2), and the float valve (2) is fixed in the washing tower (1), the upper layer of the floating valve tower plate (2) is provided with a wire mesh demister (4), the wire mesh demister (4) is fixedly installed on the inner side wall of the water washing tower (1), the top end of the outer side wall of the water washing tower (1) is provided with a desalted water pipeline (5), the desalted water pipeline (5) is located between the floating valve tower plate (2) and the wire mesh demister (4), the desalted water pipeline (5) is fixedly connected with the water washing tower (1), the top of the water washing tower (1) is provided with an air outlet pipeline (8), and the air outlet pipeline (8) is fixedly connected with the water washing tower (1).
2. The device for treating VOCs in the low-temperature methanol-washing tail gas according to claim 1, characterized in that: the input of waste water pipeline (7) is equipped with bottom of the tower drain pump (17), bottom of the tower drain pump (17) and external power source electric connection, just bottom of the tower drain pump (17) with waste water pipeline (7) sealing connection, the input of bottom of the tower drain pump (17) is equipped with waste water pipeline flow control valve (15), waste water pipeline flow control valve (15) with bottom of the tower drain pump (17) electric connection.
3. The device for treating VOCs in the low-temperature methanol-washing tail gas according to claim 2, characterized in that: be equipped with pressure differential liquid level changer (18) on the bottom lateral wall of scrubbing tower (1), the input of pressure differential liquid level changer (18), output all run through scrubbing tower (1) to stretch into extremely the inside of scrubbing tower (1), pressure differential liquid level changer (18) with scrubbing tower (1) fixed connection.
4. The device for treating VOCs in the low-temperature methanol-washing tail gas according to claim 3, wherein: the input end of the tail gas pipeline (6) is provided with a tail gas pipeline flow regulating valve (14), and the tail gas pipeline flow regulating valve (14) is fixedly connected with the tail gas pipeline (6).
5. The device of claim 4, wherein the device for treating VOCs in the low-temperature methanol-washing tail gas comprises: be equipped with pressure transmitter (11) at the bottom of the tower on the bottom lateral wall of washing tower (1), pressure transmitter (11) at the bottom of the tower with washing tower (1) fixed connection, pressure transmitter (11) and external power source electric connection at the bottom of the tower.
6. The device for treating VOCs in the low-temperature methanol-washing tail gas according to claim 5, wherein: the output of desalination water pipe way (5) is equipped with desalination water pipe way flow control valve (13), desalination water pipe way flow control valve (13) with desalination water pipe way (5) fixed connection, desalination water pipe way flow control valve (13) and external power source electric connection.
7. The device of claim 6, wherein the device for treating VOCs in the low-temperature methanol-washing tail gas comprises: the top of the washing tower (1) is respectively provided with a tower top pressure transmitter (9) and a tower top temperature measuring element (10), and the tower top pressure transmitter (9) and the tower top temperature measuring element (10) are fixedly connected with the washing tower (1).
8. The device for treating VOCs in the low-temperature methanol-washing tail gas according to claim 7, wherein: the output end of the air outlet pipeline (8) is fixedly connected with an air outlet pipeline flow regulating valve (16), and the air outlet pipeline flow regulating valve (16) is electrically connected with an external power supply.
A method for treating VOCs in low-temperature methanol washing tail gas is characterized by comprising the following steps: low temperature methanol washing tail gas VOCs processing apparatus, include the following step:
step S1, enabling the tail gas rich in VOCs from the low-temperature methanol washing tail gas pipeline (6) to enter the bottom of the water washing tower (1), and enabling the tail gas to move from bottom to top through a valve hole of a float valve tower plate (2) of the water washing tower (1);
step S2, enabling desalted water to enter the upper part of a water washing tower (1) from a desalted water pipeline (5), enabling the desalted water to flow to the bottom of the tower from top to bottom along an S shape of a float valve tray (2) and a downcomer (3), enabling tail gas and the desalted water to perform gas-liquid exchange on the float valve tray (2), and enabling the desalted water to absorb VOCs in the tail gas;
and S3, enabling the purified tail gas to enter a discharge system from an air outlet pipeline, enabling the tower bottom wastewater for absorbing the VOCs to enter a methanol-water separation system from a tower bottom drainage pump (17), arranging a pressure transmitter (9) and a temperature measuring element (10) on the top of a washing tower (1) in the absorption process, arranging a pressure transmitter (11) and a temperature measuring element (12) on the bottom of the tower to measure the pressure change of the washing tower, the pressure drop and the temperature change of the whole tower at any time, arranging a differential pressure liquid level transmitter (18) on the bottom of the tower, and monitoring the liquid level change at the bottom of the tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010801911.XA CN112058021A (en) | 2020-08-11 | 2020-08-11 | Low-temperature methanol washing tail gas VOCs treatment method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010801911.XA CN112058021A (en) | 2020-08-11 | 2020-08-11 | Low-temperature methanol washing tail gas VOCs treatment method and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112058021A true CN112058021A (en) | 2020-12-11 |
Family
ID=73661131
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010801911.XA Pending CN112058021A (en) | 2020-08-11 | 2020-08-11 | Low-temperature methanol washing tail gas VOCs treatment method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112058021A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113058388A (en) * | 2021-03-25 | 2021-07-02 | 金能科技股份有限公司 | Bubble tower device for treating methanol waste gas and using method |
| CN116425114A (en) * | 2023-04-21 | 2023-07-14 | 中船(邯郸)派瑞氢能科技有限公司 | Water washing tower circulating system and method in methanol pyrolysis hydrogen production process |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3888955A (en) * | 1973-04-04 | 1975-06-10 | Saburo Maruko | Connection device |
| CN1110868A (en) * | 1993-06-17 | 1995-10-25 | 代尔·E·纳特尔 | High capacity tray for gas-liquid contact apparatus |
| CN101541397A (en) * | 2006-10-06 | 2009-09-23 | 林德股份公司 | Washing column with reduced construction height |
| CN105056706A (en) * | 2015-08-19 | 2015-11-18 | 常州大学 | Methanol waste gas recycling system based on secondary absorption |
| CN204933204U (en) * | 2015-07-31 | 2016-01-06 | 常州一烃环保科技有限公司 | A kind of methanol waste gas recovery system |
| CN106268191A (en) * | 2016-09-13 | 2017-01-04 | 中国天辰工程有限公司 | A kind of low-temperature methanol washing tail-gas water washing device and process thereof |
| CN206721142U (en) * | 2017-05-22 | 2017-12-08 | 天脊煤化工集团股份有限公司 | A kind of tandem low-temp methanol washes the purification separation device of cooled coal gas |
| CN207941381U (en) * | 2018-01-11 | 2018-10-09 | 中石化南京工程有限公司 | A kind of packed tower tail gas absorbing system of double section liquid phase feedings |
| CN207941363U (en) * | 2018-01-11 | 2018-10-09 | 中石化南京工程有限公司 | A kind of plate column tail gas absorbing system of double section liquid phase feedings |
| CN209108890U (en) * | 2018-11-07 | 2019-07-16 | 中石化南京工程有限公司 | A kind of tail gas absorbing system being self-regulated |
| CN210522190U (en) * | 2019-06-14 | 2020-05-15 | 中石化宁波工程有限公司 | Tail gas washing and purifying system |
| CN210964542U (en) * | 2019-11-06 | 2020-07-10 | 南京诚志清洁能源有限公司 | Methanol rectification noncondensable gas-liquid recovery device |
| CN212974661U (en) * | 2020-08-11 | 2021-04-16 | 陕西大秦环境科技有限公司 | Low temperature methyl alcohol washes tail gas VOCs processing apparatus |
-
2020
- 2020-08-11 CN CN202010801911.XA patent/CN112058021A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3888955A (en) * | 1973-04-04 | 1975-06-10 | Saburo Maruko | Connection device |
| CN1110868A (en) * | 1993-06-17 | 1995-10-25 | 代尔·E·纳特尔 | High capacity tray for gas-liquid contact apparatus |
| CN101541397A (en) * | 2006-10-06 | 2009-09-23 | 林德股份公司 | Washing column with reduced construction height |
| CN204933204U (en) * | 2015-07-31 | 2016-01-06 | 常州一烃环保科技有限公司 | A kind of methanol waste gas recovery system |
| CN105056706A (en) * | 2015-08-19 | 2015-11-18 | 常州大学 | Methanol waste gas recycling system based on secondary absorption |
| CN106268191A (en) * | 2016-09-13 | 2017-01-04 | 中国天辰工程有限公司 | A kind of low-temperature methanol washing tail-gas water washing device and process thereof |
| CN206721142U (en) * | 2017-05-22 | 2017-12-08 | 天脊煤化工集团股份有限公司 | A kind of tandem low-temp methanol washes the purification separation device of cooled coal gas |
| CN207941381U (en) * | 2018-01-11 | 2018-10-09 | 中石化南京工程有限公司 | A kind of packed tower tail gas absorbing system of double section liquid phase feedings |
| CN207941363U (en) * | 2018-01-11 | 2018-10-09 | 中石化南京工程有限公司 | A kind of plate column tail gas absorbing system of double section liquid phase feedings |
| CN209108890U (en) * | 2018-11-07 | 2019-07-16 | 中石化南京工程有限公司 | A kind of tail gas absorbing system being self-regulated |
| CN210522190U (en) * | 2019-06-14 | 2020-05-15 | 中石化宁波工程有限公司 | Tail gas washing and purifying system |
| CN210964542U (en) * | 2019-11-06 | 2020-07-10 | 南京诚志清洁能源有限公司 | Methanol rectification noncondensable gas-liquid recovery device |
| CN212974661U (en) * | 2020-08-11 | 2021-04-16 | 陕西大秦环境科技有限公司 | Low temperature methyl alcohol washes tail gas VOCs processing apparatus |
Non-Patent Citations (1)
| Title |
|---|
| 许开天: "酒精蒸馏技术", 30 November 1990, 中国轻工业出版社, pages: 141 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113058388A (en) * | 2021-03-25 | 2021-07-02 | 金能科技股份有限公司 | Bubble tower device for treating methanol waste gas and using method |
| CN116425114A (en) * | 2023-04-21 | 2023-07-14 | 中船(邯郸)派瑞氢能科技有限公司 | Water washing tower circulating system and method in methanol pyrolysis hydrogen production process |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9975085B2 (en) | Container-type biogas purification film method purification system | |
| CN100518892C (en) | Method and device for removing hydrogen sulphide from mixture gas containing low-concentration hydrogen sulphide | |
| CN101143297B (en) | Sewage storage tank exhaust air-release purification processing method | |
| CN203556260U (en) | Recovery device of easily volatile organic solvent in wastewater or waste gas | |
| CN112058021A (en) | Low-temperature methanol washing tail gas VOCs treatment method and device | |
| CN201643967U (en) | Industrial waste gas treatment and recycling device | |
| CN212974661U (en) | Low temperature methyl alcohol washes tail gas VOCs processing apparatus | |
| CN203874635U (en) | Device for recycling tank field heavy polluted oil waste gas | |
| CN102908882B (en) | Treatment method for emissions of sour water storage tank | |
| CN203598691U (en) | Device for recovering and purifying organic exhaust gases by adsorption-photocatalytic method | |
| CN210751969U (en) | Naphthalene-containing waste gas treatment system | |
| CN209771772U (en) | Landfill gas pressure boost deep purification system | |
| CN111992014A (en) | Macroporous resin adsorption, desorption, condensation and recovery system | |
| CN215539670U (en) | Carbon dioxide production exhaust treatment device | |
| CN113528196B (en) | Shifted gas treatment or improvement process and low-temperature methanol washing device and process | |
| CN213556250U (en) | System for treating malodorous gas on top of acidic water tank | |
| CN214862443U (en) | Gaseous processing apparatus of VOCs who contains tar sewage | |
| CN211612236U (en) | Paraquat exhaust treatment device | |
| CN209791257U (en) | plasticizer VOCs photolysis system | |
| CN112221324A (en) | Process for removing carbonyl sulfide in liquefied gas | |
| CN220918659U (en) | Washing system for reducing methanol content in low-temperature methanol washing tail gas | |
| CN221107616U (en) | Acid vapour purifier | |
| CN217092778U (en) | Device for treating organic waste gas of lactone synthetic spice by combined process | |
| CN208757255U (en) | Rectisol system and its Mathanol regenerating unit | |
| CN109504477B (en) | Gas field single well liquid desulfurization device and process method based on non-regenerated solution |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |