CN212974661U - Low temperature methyl alcohol washes tail gas VOCs processing apparatus - Google Patents
Low temperature methyl alcohol washes tail gas VOCs processing apparatus Download PDFInfo
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- CN212974661U CN212974661U CN202021656713.0U CN202021656713U CN212974661U CN 212974661 U CN212974661 U CN 212974661U CN 202021656713 U CN202021656713 U CN 202021656713U CN 212974661 U CN212974661 U CN 212974661U
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Abstract
The utility model belongs to the technical field of chemical plant waste gas treatment, in particular to a low-temperature methanol washing tail gas VOCs treatment device, which comprises a washing tower, wherein the bottom of the washing tower is provided with a waste water pipeline for discharging waste water, the bottom of the washing tower is provided with a tower bottom temperature measurement element, the detection end of the tower bottom temperature measurement element extends into the washing tower, the tower bottom temperature measurement element is fixedly connected with the washing tower, and the tail gas pipeline is connected below the lowest layer of 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 utility model belongs to the technical field of chemical plant exhaust-gas treatment, concretely relates to tail gas VOCs processing apparatus is washed to low temperature methyl alcohol.
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.
SUMMERY OF THE UTILITY MODEL
To solve the problems set forth in the background art described above. The utility model provides a tail gas VOCs processing apparatus is washed to low temperature methyl alcohol has that the processing property is reliable, convenient operation, characteristics that application prospect is wide.
In order to achieve the above object, the utility model provides a 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, a tail gas pipeline is arranged at the bottom end 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 downcomer is arranged in the washing tower and is close to the upper part of the tail gas pipeline, the downcomer is fixedly connected with the washing tower, a float valve tower plate is arranged above the downcomer, a float valve 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.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses in, the washing tower is used low temperature methyl alcohol to wash tail gas VOCs and is handled, simple process, convenient operation, environmental effect is better, and tail gas after the processing satisfies national standard's requirement, and purifier low temperature methyl alcohol washes and to be not more than 50mg Nm3 in the waste gas of emptying, the utility model discloses wash the device influence less to low temperature methyl alcohol, methyl alcohol in the waste water passes through methyl alcohol water separating unit and can retrieve and circulate to low temperature methyl alcohol and wash the unit reuse, and complete equipment area is little, and throughput is good, adopts the washing method to carry out the device of handling to VOCs, absorbent cyclic utilization, and the working costs is little, and the energy consumption is little, and disposable investment is low, has better economic advantage, and this set of device is applied to the complete equipment who handles dangerous high chemical tail gas, and operating condition is the normal atmospheric temperature, does not relate to the easy operation hidden danger that takes place the incident such as high temperature, and.
Drawings
The accompanying drawings 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 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 described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to 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 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 down-flow pipe 3 is arranged in the washing tower 1 and close to the upper part of the tail gas pipeline 6, the down-flow pipe 3 is fixedly connected with the washing tower 1, a floating valve tower plate 2 is arranged above the down-flow pipe 3, the floating valve tower plate 2 is fixed in 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, 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 modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. 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) and a tail gas pipeline (6), wherein 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), 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), the tail gas pipeline (6) is connected below the lowermost layer 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 downcomer (3) is arranged above the tail gas pipeline (6) close to the inside of the washing tower (1), the downcomer (3) is fixedly connected with the washing tower (1), a floating valve tower plate (2) is arranged above the downcomer (3), the water washing device is characterized in that the float valve tower plate (2) is fixed inside the water washing tower (1), a wire mesh demister (4) is arranged above the float valve tower plate (2), the wire mesh demister (4) is fixedly installed on the inner side wall of the water washing tower (1), a desalting water pipeline (5) is arranged at the top end of the outer side wall of the water washing tower (1), the desalting water pipeline (5) is located between the float valve tower plate (2) and the wire mesh demister (4), the desalting water pipeline (5) is fixedly connected with the water washing tower (1), a gas outlet pipeline (8) is arranged at the top of the water washing tower (1), and the gas 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.
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CN112058021A (en) * | 2020-08-11 | 2020-12-11 | 陕西大秦环境科技有限公司 | Low-temperature methanol washing tail gas VOCs treatment method and device |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN112058021A (en) * | 2020-08-11 | 2020-12-11 | 陕西大秦环境科技有限公司 | Low-temperature methanol washing tail gas VOCs treatment method and device |
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