CN113499661A - Treatment device and method for Volatile Organic Compounds (VOCs) - Google Patents

Treatment device and method for Volatile Organic Compounds (VOCs) Download PDF

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Publication number
CN113499661A
CN113499661A CN202110839715.6A CN202110839715A CN113499661A CN 113499661 A CN113499661 A CN 113499661A CN 202110839715 A CN202110839715 A CN 202110839715A CN 113499661 A CN113499661 A CN 113499661A
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vocs
communicated
liquid ring
buffer tank
organic compounds
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高怀荣
白小春
倪晓斌
韩启飞
李亚敏
秦广华
张海明
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Shaanxi Yanchang Petroleum Group Co Ltd
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Shaanxi Yanchang Petroleum Group Co Ltd
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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
    • B01D53/1487—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
    • B01D53/002—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 condensation
    • 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
    • B01D53/22—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 diffusion
    • B01D53/229—Integrated processes (Diffusion and at least one other process, e.g. adsorption, 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8678—Removing components of undefined structure
    • B01D53/8687—Organic components
    • 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
    • B01D53/22—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 diffusion
    • B01D2053/221—Devices
    • B01D2053/222—Devices with plates
    • 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
    • B01D2257/702—Hydrocarbons
    • 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

Abstract

The invention belongs to the technical field of Volatile Organic Compounds (VOCs) treatment, and particularly relates to a device and a method for treating Volatile Organic Compounds (VOCs). The treatment device comprises a collecting mechanism, an absorbing mechanism, a membrane separation assembly, a liquid ring vacuum pump, a buffer mechanism and a catalytic cracking regenerator; one end of the collecting mechanism is communicated with the VOCs release source, and the other end of the collecting mechanism is communicated with the absorbing mechanism; the membrane separation assembly is provided with a interception area and a permeation area, the interception area is communicated with the absorption mechanism, the upper part of the interception area is communicated with the input end of the buffer mechanism, and the bottom of the permeation area is communicated with the collection mechanism through a liquid ring vacuum pump; the output end of the buffer mechanism is communicated with the catalytic cracking regenerator. According to the invention, VOCs are oxidized by applying absorption or condensation, a membrane and a catalytic regenerator, heavy components in volatile matters are fully recovered, the emission limit value of VOCs is effectively reduced, and the device can operate stably. The invention has simple transformation process, low cost and short period.

Description

Treatment device and method for Volatile Organic Compounds (VOCs)
Technical Field
The invention belongs to the technical field of Volatile Organic Compounds (VOCs) treatment, and particularly relates to a device and a method for treating Volatile Organic Compounds (VOCs).
Background
The Volatile Organic Compounds (VOCs) refer to organic compounds with a saturated vapor pressure of more than 70.91Pa at normal temperature, a boiling point of 50-260 ℃ below under a standard atmospheric pressure of 101.3kPa and an initial boiling point of 250 ℃, or any volatile organic solid or liquid at normal temperature and normal pressure.
At present, VOCs treatment methods are numerous and can be divided into three types, namely oxidation technology, recovery technology and biotechnology. The recovery method includes absorption, adsorption, membrane separation, condensation, and the like, and the volatile organic compounds are generally concentrated and separated by a physical method. The oxidation method comprises direct combustion, thermal combustion, catalytic oxidation, heat accumulation combustion and the like, and mainly converts volatile organic compounds into harmless CO through chemical reaction2And H2O and other non-toxic inorganic compounds. The biological method comprises a biological washing method, a biological filtration method and a biological trickling filtration method, and VOCs are used as metabolic substrates by utilizing microorganisms to degrade and convert the VOCs into harmless substances.
At present, when a recovery treatment method is adopted, the influence of VOCs components is large, and when the components contain light components, the effect of 120mg/m cannot be basically achieved3An oxidation treatment method needs to be introduced, while the biotechnology has higher requirements on VOCs components, mainly aims at the treatment of VOCs in a sewage device, and compounds the componentsThe amount of impurities and coming water is unstable, oxygen is contained, VOCs cannot be stably discharged up to the standard, and potential safety hazards of operation exist.
Disclosure of Invention
The invention provides a device and a method for treating Volatile Organic Compounds (VOCs) in order to solve the problem that the treatment of multi-component or special-component volatile organic compounds does not reach the standard.
In order to achieve the purpose, the invention adopts the technical scheme that:
a treatment device for Volatile Organic Compounds (VOCs) comprises a collecting mechanism, an absorbing mechanism, a membrane separation assembly, a liquid ring vacuum pump, a buffer mechanism and a catalytic cracking regenerator; one end of the collecting mechanism is communicated with the VOCs release source, and the other end of the collecting mechanism is communicated with the absorbing mechanism; the membrane separation assembly is provided with a trapping region and a permeation region, the trapping region is communicated with the absorption mechanism, the upper part of the trapping region is communicated with the input end of the buffer mechanism, and the bottom of the permeation region is communicated with the collection mechanism through a liquid ring vacuum pump; the output end of the buffer mechanism is communicated with the catalytic cracking regenerator.
The collecting mechanism comprises a collecting pipeline and a raw material buffer tank; one end of the collecting pipeline is communicated with the VOCs release source, and the other end of the collecting pipeline is communicated with the raw material buffer tank; the bottom of the raw material buffer tank is connected with a first nitrogen control valve, and the top of the raw material buffer tank is communicated with the absorption mechanism.
The absorption mechanism comprises a first liquid ring compressor and an absorption tower; the input end of the first liquid ring compressor is connected with the collecting mechanism through a pipeline, and the output end of the first liquid ring compressor is communicated with the absorption tower; the top of the absorption tower is communicated with the membrane separation component, the bottom of the absorption tower is provided with an output port, and the side wall of the upper part of the absorption tower is provided with an absorbent input port.
And a pipeline for connecting the first liquid ring compressor and the collecting mechanism is connected with an emergency evacuation valve, a first concentration detector and a self-protection control system.
The buffer mechanism comprises a buffer tank and a second hydraulic ring compressor; the buffer tank is communicated with the membrane separation assembly, the top of the buffer tank is communicated with the catalytic cracking regenerator through a second liquid ring compressor, and the bottom of the buffer tank is connected with a second nitrogen control valve.
The second hydraulic ring compressor is provided with a pressure self-protection control valve and a check valve on a pipeline communicated with the catalytic cracking regenerator; a second concentration detector and a self-protection control system are arranged on a pipeline between the second hydraulic ring compressor and the pressure self-protection control valve; and a pressure detection system is arranged on the pressure self-protection control valve.
The device also comprises a protection one-way valve; the protection one-way valve is arranged on a pipeline connected with the buffer mechanism and the catalytic cracking regenerator and is close to a connecting port of the catalytic cracking regenerator.
The device also comprises a controller; the controller is respectively connected with the collection mechanism, the absorption mechanism, the membrane separation assembly, the liquid ring vacuum pump, the protection one-way valve and the buffer mechanism through electric signals.
A treatment method of a treatment device for Volatile Organic Compounds (VOCs) is characterized by comprising the following steps,
the method comprises the following steps: the controller closes an emergency evacuation valve, a first nitrogen control valve and a second nitrogen valve in the Volatile Organic Compounds (VOCs) treatment device;
step two: the controller controls the first liquid ring compressor and the second liquid ring compressor to start, and the collecting mechanism collects VOCs of VOCs release sources; the controller obtains a test value of the first concentration detector and a self-protection control system, when the test values of the first concentration detector and the self-protection control system exceed a preset value, the controller controls the first nitrogen control valve to be opened, nitrogen is injected into the raw material buffer tank, if the first concentration detector and the self-protection control system display that the concentration exceeds the preset value, the controller controls the emergency emptying valve to be opened, and the first liquid ring compressor and the second liquid ring compressor are interlocked and stopped;
step three: the Volatile Organic Compounds (VOCs) collected by the collecting mechanism enter an absorption tower in the absorption mechanism, an absorbent is sprayed from the upper part of the absorption tower, the absorbent absorbs hydrocarbons which can be absorbed in the Volatile Organic Compounds (VOCs), the absorbed hydrocarbons are collected at the bottom liquid phase layer of the absorption tower for temporary storage, and the hydrocarbons are discharged after being collected to a preset amount; a part of hydrocarbon and inert gas which cannot be absorbed enter the membrane separation assembly through the upper part of the absorption tower;
step four: performing membrane treatment on Volatile Organic Compounds (VOCs) entering a membrane separation assembly; wherein hydrocarbon hydrocarbons are enriched in a permeation area through a permeation membrane, return to a raw material buffer tank through the suction effect of a liquid ring vacuum pump, and reenter an absorption tower through a first liquid ring compressor for absorption; the lean hydrocarbon gas flow trapped in the trapping area enters a buffer tank;
step five: the gas entering the buffer tank enters a catalytic cracking regenerator through a second liquid ring compressor after being buffered by the buffer tank; when the concentration values of the second concentration detector and the self-protection control system obtained by the controller exceed the preset values, the controller controls to open a second nitrogen control valve and inject nitrogen into the buffer tank; when the concentration values of the second concentration detector and the self-protection control system obtained by the controller exceed preset values, the first liquid ring compressor and the second liquid ring compressor are interlocked and stopped, and meanwhile, an emergency emptying valve is opened; when the pressure value of the pressure detection system is lower than a preset value, closing the pressure self-protection control valve;
step six: and (4) the gas treated in the fifth step enters a catalytic cracking regenerator through a distributor, and the gas treated by the catalytic cracking regenerator is discharged.
Has the advantages that:
(1) according to the invention, after the Volatile Organic Compounds (VOCs) are subjected to absorption or condensation, membrane and catalytic regenerator oxidation, heavy components in the volatile organic compounds are fully recovered, the emission limit value of the Volatile Organic Compounds (VOCs) is effectively reduced, and the device can run stably.
(2) The invention has simple transformation process, low cost and short period.
The foregoing is merely an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to be implemented in accordance with the content of the description, the following is a detailed description of preferred embodiments of the present invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic view of the apparatus of the present invention.
In the figure: 1-a source of release of VOCs; 2-a raw material buffer tank; 3-emergency evacuation valve; 4-a first nitrogen control valve; 5-a first liquid ring compressor; 6-an absorption tower; 7-a membrane separation module; 8-a buffer tank; 9-a second liquid ring compressor; 10-a second nitrogen control valve; 11-pressure self-protection control valve; 12-a catalytic cracking regenerator; 13-liquid ring vacuum pump; 14-a first concentration detector and a self-protection control system; 15-a second concentration detector and a self-protection control system; 16-a pressure detection system; 17-a check valve; 18-protection of the one-way valve.
The foregoing is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clear and clear, and to implement them in accordance with the content of the description, the following is a detailed description of preferred embodiments of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood 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.
The first embodiment is as follows:
referring to fig. 1, the device for treating volatile organic compounds VOCs includes a collecting mechanism, an absorbing mechanism, a membrane separation assembly 7, a liquid ring vacuum pump 13, a buffer mechanism and a catalytic cracking regenerator 12; one end of the collecting mechanism is communicated with the VOCs release source 1, and the other end of the collecting mechanism is communicated with the absorbing mechanism; the membrane separation assembly 7 is provided with a trapping region and a permeation region, the trapping region is communicated with the absorption mechanism, the upper part of the trapping region is communicated with the input end of the buffer mechanism, and the bottom of the permeation region is communicated with the collection mechanism through a liquid ring vacuum pump 13; the output end of the buffer mechanism is communicated with the catalytic cracking regenerator 12.
In specific application, the collection mechanism collects Volatile Organic Compounds (VOCs) of the VOCs release source 1; then, the Volatile Organic Compounds (VOCs) collected by the collecting mechanism enter an absorbing mechanism, the absorbing mechanism sprays an absorbent, the absorbent absorbs hydrocarbons which can be absorbed in the Volatile Organic Compounds (VOCs), the hydrocarbons are absorbed by the absorbent and collected in a tower bottom liquid phase layer of an absorbing tower 6 in the absorbing mechanism for temporary storage, and the hydrocarbons are discharged after being collected to a preset amount; a part of hydrocarbon and inert gas which cannot be absorbed enter a membrane separation assembly 7 through the upper part of an absorption tower 6; performing membrane treatment on Volatile Organic Compounds (VOCs) entering the membrane separation component 7; wherein hydrocarbon compounds pass through a permeation membrane in the membrane separation assembly 7, are enriched in a permeation region, are returned to the raw material buffer tank 2 through the suction effect of a liquid ring vacuum pump 13, and then enter the absorption tower 6 again for absorption; the lean hydrocarbon gas flow trapped in the trapping area enters a buffer tank 8 in the buffer mechanism; the gas entering the buffer tank 8 enters a catalytic cracking regenerator 12 after being buffered; the gas treated by the catalytic cracking regenerator 12 is discharged.
According to the invention, after the Volatile Organic Compounds (VOCs) are oxidized by absorption or condensation, a membrane and a catalytic regenerator, heavy components in the volatile organic compounds are fully recovered, the emission limit value of the Volatile Organic Compounds (VOCs) is effectively reduced, the device can run stably, and the mg-level emission reaching the standard is finally realized. The invention has simple transformation process, low cost and short period.
The membrane separation assembly in the embodiment adopts the prior art, the interior of the membrane separation assembly is of a columnar arrangement structure, the number of columnar membranes is set according to the concentration of VOCs, the interior of the membrane separation assembly is a dense multi-base separation membrane, and separation is carried out according to the difference of the membrane velocity of hydrocarbon and non-hydrocarbon substances; each columnar membrane can be divided into a trapping area and a permeation area; a through hole connected with the absorption mechanism is formed in the side wall of the interception area, and a through hole connected with the buffer mechanism is formed in the top of the interception area; the bottom of the infiltration area is provided with a through hole connected with a liquid ring vacuum pump. In practical use, after the primarily treated Volatile Organic Compounds (VOCs) enter the membrane separation assembly 7, pressure difference exists between two sides of the permeation membrane under the suction effect of the liquid ring vacuum pump 13. Wherein, the hydrocarbon with larger molecular weight preferentially permeates through the permeation membrane, is enriched in the permeation area, returns to the compressor 5 through the suction effect of the liquid ring vacuum pump 13 and enters the absorption tower 6 again for absorption; the trapped gas is the gas flow which is low in trapped hydrocarbon and mainly comprises air and a small amount of hydrocarbon, most of the hydrocarbon in the trapped gas is reduced through the separation process, and then the gas flow enters a buffer tank 8 for buffering, enters a liquid ring compressor 9 after being buffered by the buffer tank 8, and enters a catalytic cracking regenerator unit after being compressed and pressurized. By adopting the technical scheme, the concentration of the Volatile Organic Compounds (VOCs) is greatly reduced, the concentration control is stable, no impact is caused on catalytic operation when the Volatile Organic Compounds (VOCs) enter a catalytic regenerator for oxidation, the oxidized Volatile Organic Compounds (VOCs) can completely meet the emission limit requirement, and the problem that the emission of the volatile organic compounds does not reach the standard is effectively solved.
Example two:
referring to fig. 1, in a device for treating VOCs, on the basis of the first embodiment, the collecting mechanism includes a collecting pipeline and a raw material buffer tank 2; one end of the collecting pipeline is communicated with the VOCs release source 1, and the other end of the collecting pipeline is communicated with the raw material buffer tank 2; the bottom of the raw material buffer tank 2 is connected with a first nitrogen control valve 4, and the top of the raw material buffer tank 2 is communicated with an absorption mechanism.
When in actual use, the volatile organic compounds VOCs that VOCs release source 1 released gathers in raw materials buffer tank 2 through collecting the pipeline, and when the volatile organic compounds VOCs concentration in raw materials buffer tank 2 was greater than the default, open first nitrogen control valve 4, supply nitrogen gas in to raw materials buffer tank 2 to reduce volatile organic compounds VOCs concentration, ensure that volatile organic compounds VOCs administers the process safety and goes on.
Example three:
referring to fig. 1, in a treatment device for VOCs, on the basis of the first embodiment, the absorption mechanism includes a first liquid ring compressor 5 and an absorption tower 6; the input end of the first liquid ring compressor 5 is connected with the collecting mechanism through a pipeline, and the output end of the first liquid ring compressor 5 is communicated with the absorption tower 6; the top of the absorption tower 6 is communicated with the membrane separation component 7, the bottom of the absorption tower 6 is provided with an output port, and the side wall of the upper part of the absorption tower 6 is provided with an absorbent input port.
Furthermore, an emergency evacuation valve 3, a first concentration detector and a self-protection control system 14 are connected to a pipeline connecting the first liquid ring compressor 5 and the collecting mechanism.
During actual use, the Volatile Organic Compounds (VOCs) collected by the collecting mechanism enter the absorption tower (6), the upper part of the absorption tower (6) sprays the absorbent on the Volatile Organic Compounds (VOCs) in the absorption tower (6), the absorbent is fully contacted with the Volatile Organic Compounds (VOCs) to absorb hydrocarbon in the Volatile Organic Compounds (VOCs), the absorbed volatile organic compounds are collected in a liquid phase layer at the bottom of the absorption tower (6) for temporary storage, and the volatile organic compounds are discharged after being collected to a preset amount; a part of hydrocarbon and inert gas which cannot be absorbed enter the membrane separation component 7 through the upper part of the absorption tower 6, and primary treatment of the Volatile Organic Compounds (VOCs) is completed.
The absorbent can also be replaced by gasoline or diesel or other absorbents.
The absorption column 6 in this embodiment may be replaced by condensation.
Example four:
referring to fig. 1, a device for treating VOCs is shown, in which on the basis of the first embodiment: the buffer mechanism comprises a buffer tank 8 and a second hydraulic ring compressor 9; the buffer tank 8 is communicated with the membrane separation component 7, the top of the buffer tank 8 is communicated with the catalytic cracking regenerator 12 through a second hydraulic ring compressor 9, and the bottom of the buffer tank 8 is connected with a second nitrogen control valve 10.
Further, the second liquid ring compressor 9 is provided with a pressure self-protection control valve 11 and a check valve 17 on a pipeline communicated with the catalytic cracking regenerator 12; a second concentration detector and a self-protection control system 15 are arranged on a pipeline between the second hydraulic ring compressor 9 and the pressure self-protection control valve 11; the pressure self-protection control valve 11 is provided with a pressure detection system 16.
When in actual use, this technical scheme's adoption for volatile organic compounds VOCs's improvement device can the safe operation.
Example five:
referring to fig. 1, a device for treating VOCs is shown, in which on the basis of the first embodiment: also included is a protective check valve 18; the protection check valve 18 is arranged on a pipeline connecting the buffer mechanism and the catalytic cracking regenerator 12 and is close to a connecting port of the catalytic cracking regenerator 12.
In practical use, the protection one-way valve 18 is arranged for back blowing, so that the potential safety hazard caused by the fact that the check valve 17 is blocked by the poured catalyst in the chemical cracking regenerator 12 is avoided.
Example six:
referring to fig. 1, a device for treating VOCs is shown, in which on the basis of the first embodiment: the device also comprises a controller; the controller is respectively connected with the collecting mechanism, the absorbing mechanism, the membrane separation component 7, the liquid ring vacuum pump 13, the protection one-way valve 18 and the buffer mechanism through electric signals.
When in actual use, the technical scheme is adopted, so that the treatment process is automatic, the manpower is greatly saved, and the safety and the stability of operation are ensured.
Example seven:
referring to fig. 1, a device for treating VOCs is shown, in which on the basis of the first embodiment: also included are a protective check valve 18 and a controller; the collecting mechanism comprises a collecting pipeline and a raw material buffer tank 2; one end of the collecting pipeline is communicated with the VOCs release source 1, and the other end of the collecting pipeline is communicated with the raw material buffer tank 2; the bottom of the raw material buffer tank 2 is connected with a first nitrogen control valve 4, and the top of the raw material buffer tank 2 is communicated with an absorption mechanism; the absorption mechanism comprises a first liquid ring compressor 5 and an absorption tower 6; the input end of the first liquid ring compressor 5 is connected with the collecting mechanism through a pipeline, and the output end of the first liquid ring compressor 5 is communicated with the absorption tower 6; the top of the absorption tower 6 is communicated with the membrane separation component 7, the bottom of the absorption tower 6 is provided with an output port, and the side wall of the upper part of the absorption tower 6 is provided with an absorbent input port; the pipeline connecting the first liquid ring compressor 5 and the collecting mechanism is connected with an emergency evacuation valve 3, a first concentration detector and a self-protection control system 14; the buffer mechanism comprises a buffer tank 8 and a second hydraulic ring compressor 9; the buffer tank 8 is communicated with the membrane separation component 7, the top of the buffer tank 8 is communicated with the catalytic cracking regenerator 12 through a second hydraulic ring compressor 9, and the bottom of the buffer tank 8 is connected with a second nitrogen control valve 10; the second hydraulic ring compressor 9 is provided with a pressure self-protection control valve 11 and a check valve 17 on a pipeline communicated with the catalytic cracking regenerator 12; a second concentration detector and a self-protection control system 15 are arranged on a pipeline between the second hydraulic ring compressor 9 and the pressure self-protection control valve 11; the pressure self-protection control valve 11 is provided with a pressure detection system 16; the protection one-way valve 18 is arranged on a pipeline connecting the buffer mechanism and the catalytic cracking regenerator 12 and is close to a connecting port of the catalytic cracking regenerator 12; the controller is respectively connected with the collecting mechanism, the absorbing mechanism, the membrane separation component 7, the liquid ring vacuum pump 13, the protection one-way valve 18 and the buffer mechanism through electric signals.
In actual use, the emergency evacuation valve 3 and the first nitrogen control valve 4 in the Volatile Organic Compounds (VOCs) treatment device are closed by the controller, and the second nitrogen valve 10 is closed; then the controller controls the first liquid ring compressor 5 and the second liquid ring compressor 9 to start, and the collection mechanism collects the Volatile Organic Compounds (VOCs) of the VOCs release source 1; the controller obtains a test value of the first concentration detector and the self-protection control system 14, when the test value of the first concentration detector and the self-protection control system 14 exceeds a preset value, the controller controls the first nitrogen control valve 4 to be opened, nitrogen is injected into the raw material buffer tank 2, if the first concentration detector and the self-protection control system 14 display that the concentration exceeds the preset value, the controller controls the emergency evacuation valve 3 to be opened, and the first liquid ring compressor 5 and the second liquid ring compressor 9 are stopped at the same time; the Volatile Organic Compounds (VOCs) collected by the collecting mechanism enter an absorption tower (6) in the absorption mechanism, an absorbent is sprayed from the upper part of the absorption tower (6), the absorbent absorbs hydrocarbons which can be absorbed by the Volatile Organic Compounds (VOCs), the absorbed hydrocarbons are collected at the bottom of the absorption tower (6) for temporary storage, and the absorbed hydrocarbons are discharged after a preset amount of the absorbed hydrocarbons is collected; a part of hydrocarbon and inert gas which cannot be absorbed enter a membrane separation assembly 7 through the upper part of an absorption tower 6; performing membrane treatment on Volatile Organic Compounds (VOCs) entering the membrane separation component 7; wherein, the hydrocarbon with larger molecular weight passes through a permeation membrane to be enriched in a permeation region, returns to the raw material buffer tank 2 under the suction action of a liquid ring vacuum pump 13, and enters the absorption tower 6 again for absorption through a first liquid ring compressor 5; while the hydrocarbon-lean gas stream, which is trapped in the trapping zone, enters the buffer tank 8. The gas entering the buffer tank 8 enters a catalytic cracking regenerator 12 through a second liquid ring compressor 9 after being buffered by the buffer tank 8; when the concentration values of the second concentration detector and the self-protection control system 15 obtained by the controller exceed the preset values, the controller controls to open the second nitrogen control valve 10, and nitrogen is injected into the buffer tank 8 to reduce the concentration of Volatile Organic Compounds (VOCs) in the buffer tank 8; when the concentration values of the second concentration detector and the self-protection control system 15 obtained by the controller exceed the preset values, the first liquid ring compressor 5 and the second liquid ring compressor 9 are interlocked and stopped, and the emergency emptying valve 3 is opened; when the pressure value of the pressure detection system 16 is lower than the preset value, the pressure self-protection control valve 11 is closed.
The gas treated by the catalytic cracking regenerator 12 is directly discharged.
During actual use, the dispersed Volatile Organic Compounds (VOCs) are collected and enter the catalytic cracking regenerator 12 for oxidation after absorption and membrane treatment, so that the emission concentration of the Volatile Organic Compounds (VOCs) is greatly reduced, and the concentration of the Volatile Organic Compounds (VOCs) can be reduced to 30mg/m3The following. The heavy components of the Volatile Organic Compounds (VOCs) after absorption pretreatment can be recovered in a large amount, the emission concentration of the Volatile Organic Compounds (VOCs) after membrane treatment can be stabilized without being influenced by source amount fluctuation, the catalytic cracking regenerator 12 is not impacted, and the mg-level emission up to the standard is finally realized.
Example nine:
a treatment method of a treatment device for Volatile Organic Compounds (VOCs) comprises the following steps,
the method comprises the following steps: the controller closes the emergency evacuation valve 3, the first nitrogen control valve 4 and the second nitrogen valve 10 in the Volatile Organic Compounds (VOCs) treatment device;
step two: the controller controls the first liquid ring compressor 5 and the second liquid ring compressor 9 to start, and the collection mechanism collects Volatile Organic Compounds (VOCs) of the VOCs release source 1; the controller obtains a test value of the first concentration detector and the self-protection control system 14, when the test value of the first concentration detector and the self-protection control system 14 exceeds a preset value, the controller controls the first nitrogen control valve 4 to be opened, nitrogen is injected into the raw material buffer tank 2, if the first concentration detector and the self-protection control system 14 display that the concentration exceeds the preset value, the controller controls the emergency evacuation valve 3 to be opened, and the first liquid ring compressor 5 and the second liquid ring compressor 9 are stopped in an interlocking mode;
step three: the Volatile Organic Compounds (VOCs) collected by the collecting mechanism enter an absorption tower (6) in the absorption mechanism, an absorbent is sprayed from the upper part of the absorption tower (6), the absorbent absorbs hydrocarbons which can be absorbed by the Volatile Organic Compounds (VOCs), the absorbed hydrocarbons are collected at the bottom of the absorption tower (6) for temporary storage, and the absorbed hydrocarbons are discharged after a preset amount of the absorbed hydrocarbons is collected; a part of hydrocarbon and inert gas which cannot be absorbed enter a membrane separation assembly 7 through the upper part of an absorption tower 6;
step four: performing membrane treatment on Volatile Organic Compounds (VOCs) entering the membrane separation component 7; wherein, the hydrocarbon with larger molecular weight passes through a permeation membrane to be enriched in a permeation region, returns to the raw material buffer tank 2 under the suction action of a liquid ring vacuum pump 13, and enters the absorption tower 6 again for absorption through a first liquid ring compressor 5; the lean hydrocarbon gas flow trapped in the trapping area enters a buffer tank 8;
step five: the gas entering the buffer tank 8 enters a catalytic cracking regenerator 12 through a second liquid ring compressor 9 after being buffered by the buffer tank 8; when the concentration values of the second concentration detector and the self-protection control system 15 obtained by the controller exceed the preset values, the controller controls to open the second nitrogen control valve 10 and inject nitrogen into the buffer tank 8; when the concentration values of the second concentration detector and the self-protection control system 15 obtained by the controller exceed the preset values, the first liquid ring compressor 5 and the second liquid ring compressor 9 are interlocked and stopped, and the emergency emptying valve 3 is opened; when the pressure value of the pressure detection system 16 is lower than the preset value, closing the pressure self-protection control valve 11;
step six: and (4) the gas treated in the fifth step enters the catalytic cracking regenerator 12 through a distributor, and the gas treated by the catalytic cracking regenerator 12 is discharged.
During actual use, the dispersed Volatile Organic Compounds (VOCs) are collected and enter the catalytic cracking regenerator 12 for oxidation after absorption and membrane treatment, so that the emission concentration of the Volatile Organic Compounds (VOCs) is greatly reduced, and the concentration of the Volatile Organic Compounds (VOCs) can be reduced to 30mg/m3In the following, the discharge of VOCs was not increased. The Volatile Organic Compounds (VOCs) heavy components after absorption pretreatment can be recovered in a large quantity, and the emission concentration of the Volatile Organic Compounds (VOCs) after membrane treatment can be stabilized without being influenced by source amount fluctuation, so that the catalytic cracking regenerator 12 is not impacted.
During specific operation, the amount of the absorbent is generally designed absorption amount, can be adjusted on the left and right sides of the designed absorption amount, and the specifically designed absorbent amount is obtained by comprehensively calculating the material balance, the heat balance, the number of tower plates, the tower height and the like according to the VOCs components entering the absorption tower and the VOCs components exiting the theoretical tower. The absorption technology is adopted as the pretreatment technology, the one-time relative investment is low, and the operation reliability is strong. The injected nitrogen is industrial nitrogen which can meet the operation requirement.
The distributor in this embodiment is of the prior art.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
In the case of no conflict, a person skilled in the art may combine the related technical features in the above examples according to actual situations to achieve corresponding technical effects, and details of various combining situations are not described herein.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
The foregoing is illustrative of the preferred embodiments of the present invention, and the present invention is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. Any simple modification, equivalent change and modification of the above embodiments according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.

Claims (9)

1. The utility model provides a volatile organic compounds VOCs's improvement device which characterized in that: comprises a collecting mechanism, an absorbing mechanism, a membrane separation component (7), a liquid ring vacuum pump (13), a buffer mechanism and a catalytic cracking regenerator (12); one end of the collecting mechanism is communicated with the VOCs release source (1), and the other end of the collecting mechanism is communicated with the absorbing mechanism; the membrane separation assembly (7) is provided with a trapping area and a permeation area, the trapping area is communicated with the absorption mechanism, the upper part of the trapping area is communicated with the input end of the buffer mechanism, and the bottom of the permeation area is communicated with the collection mechanism through a liquid ring vacuum pump (13); the output end of the buffer mechanism is communicated with a catalytic cracking regenerator (12).
2. The apparatus according to claim 1, wherein the apparatus further comprises: the collecting mechanism comprises a collecting pipeline and a raw material buffer tank (2); one end of the collecting pipeline is communicated with the VOCs release source (1), and the other end of the collecting pipeline is communicated with the raw material buffer tank (2); the bottom of the raw material buffer tank (2) is connected with a first nitrogen control valve (4), and the top of the raw material buffer tank (2) is communicated with an absorption mechanism.
3. The apparatus according to claim 1, wherein the apparatus further comprises: the absorption mechanism comprises a first liquid ring compressor (5) and an absorption tower (6); the input end of the first liquid ring compressor (5) is connected with the collecting mechanism through a pipeline, and the output end of the first liquid ring compressor (5) is communicated with the absorption tower (6); the top of the absorption tower (6) is communicated with the membrane separation component (7), the bottom of the absorption tower (6) is provided with an output port, and the side wall of the upper part of the absorption tower (6) is provided with an absorbent input port.
4. The apparatus according to claim 3, wherein the apparatus further comprises: and a pipeline for connecting the first liquid ring compressor (5) and the collecting mechanism is connected with an emergency evacuation valve (3), a first concentration detector and a self-protection control system (14).
5. The apparatus according to claim 1, wherein the apparatus further comprises: the buffer mechanism comprises a buffer tank (8) and a second hydraulic ring compressor (9); the buffer tank (8) is communicated with the membrane separation assembly (7), the top of the buffer tank (8) is communicated with the catalytic cracking regenerator (12) through a second liquid ring compressor (9), and the bottom of the buffer tank (8) is connected with a second nitrogen control valve (10).
6. The apparatus according to claim 5, wherein the apparatus further comprises: a pipeline of the second hydraulic ring compressor (9) communicated with the catalytic cracking regenerator (12) is provided with a pressure self-protection control valve (11) and a check valve (17); a second concentration detector and a self-protection control system (15) are arranged on a pipeline between the second hydraulic ring compressor (9) and the pressure self-protection control valve (11); the pressure self-protection control valve (11) is provided with a pressure detection system (16).
7. The apparatus according to claim 1, wherein the apparatus further comprises: also comprises a protective one-way valve (18); the protection one-way valve (18) is arranged on a pipeline connected with the catalytic cracking regenerator (12) and close to a connecting port of the catalytic cracking regenerator (12).
8. The apparatus according to claim 1, wherein the apparatus further comprises: the device also comprises a controller; the controller is respectively connected with the collecting mechanism, the absorbing mechanism, the membrane separation assembly (7), the liquid ring vacuum pump (13), the protection one-way valve (18) and the buffer mechanism through electric signals.
9. The method of any one of claims 1 to 8, wherein the method comprises the steps of,
the method comprises the following steps: the controller closes an emergency evacuation valve (3), a first nitrogen control valve (4) and a second nitrogen valve (10) in the Volatile Organic Compounds (VOCs) treatment device;
step two: the controller controls the first liquid ring compressor (5) and the second liquid ring compressor (9) to start, and the collection mechanism collects Volatile Organic Compounds (VOCs) of the VOCs release source (1); the controller obtains a test value of the first concentration detector and a self-protection control system (14), when the test value of the first concentration detector and the self-protection control system (14) exceeds a preset value, the controller controls the first nitrogen control valve (4) to be opened, nitrogen is injected into the raw material buffer tank (2), if the first concentration detector and the self-protection control system (14) display that the concentration exceeds the preset value, the controller controls the emergency evacuation valve (3) to be opened, and the first liquid ring compressor (5) and the second liquid ring compressor (9) are stopped in an interlocking mode;
step three: the Volatile Organic Compounds (VOCs) collected by the collecting mechanism enter an absorption tower (6) in the absorption mechanism, an absorbent is sprayed from the upper part of the absorption tower (6), the absorbent absorbs hydrocarbons which can be absorbed by the Volatile Organic Compounds (VOCs), the absorbed hydrocarbons are collected at the bottom of the absorption tower (6) for temporary storage, and the hydrocarbons are discharged after being collected to a preset amount; a part of hydrocarbon and inert gas which cannot be absorbed enter a membrane separation assembly (7) through the upper part of an absorption tower (6);
step four: carrying out membrane treatment on Volatile Organic Compounds (VOCs) entering the membrane separation assembly (7); wherein, the hydrocarbon with larger molecular weight passes through a permeation membrane to be enriched in a permeation region, returns to the raw material buffer tank (2) through the suction effect of a liquid ring vacuum pump (13), and reenters the absorption tower (6) for absorption through a first liquid ring compressor (5); and the lean hydrocarbon gas flow trapped in the trapping area enters a buffer tank (8);
step five: the gas entering the buffer tank (8) enters a catalytic cracking regenerator (12) through a second liquid ring compressor (9) after being buffered by the buffer tank (8); when the concentration values of the second concentration detector and the self-protection control system (15) obtained by the controller exceed a preset value, the controller controls to open the second nitrogen control valve (10) and inject nitrogen into the buffer tank (8); when the concentration values of the second concentration detector and the self-protection control system (15) obtained by the controller exceed a preset value, the first liquid ring compressor (5) and the second liquid ring compressor (9) are interlocked and stopped, and meanwhile, the emergency emptying valve (3) is opened; when the pressure value of the pressure detection system (16) is lower than a preset value, closing the pressure self-protection control valve (11);
step six: and (4) the gas treated in the fifth step enters a catalytic cracking regenerator (12) through a distributor, and the gas treated by the catalytic cracking regenerator (12) is discharged.
CN202110839715.6A 2021-07-23 2021-07-23 Treatment device and method for Volatile Organic Compounds (VOCs) Pending CN113499661A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115301043A (en) * 2022-08-02 2022-11-08 陕西延长石油（集团）有限责任公司 Treatment device and method for Volatile Organic Compounds (VOCs) in storage tank area
CN116726696A (en) * 2023-08-03 2023-09-12 四川恒泰环境技术有限责任公司 Safe and efficient treatment system and process for production waste gas in fire-frying industry

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115301043A (en) * 2022-08-02 2022-11-08 陕西延长石油（集团）有限责任公司 Treatment device and method for Volatile Organic Compounds (VOCs) in storage tank area
CN115301043B (en) * 2022-08-02 2024-02-23 陕西延长石油（集团）有限责任公司 Device and method for treating volatile organic compounds VOCs in storage tank area
CN116726696A (en) * 2023-08-03 2023-09-12 四川恒泰环境技术有限责任公司 Safe and efficient treatment system and process for production waste gas in fire-frying industry
CN116726696B (en) * 2023-08-03 2024-03-26 四川恒泰环境技术有限责任公司 Safe and efficient treatment system and process for production waste gas in fire-frying industry

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