CN111013324A - Concentration method of organic waste gas - Google Patents
Concentration method of organic waste gas Download PDFInfo
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- CN111013324A CN111013324A CN201911396760.8A CN201911396760A CN111013324A CN 111013324 A CN111013324 A CN 111013324A CN 201911396760 A CN201911396760 A CN 201911396760A CN 111013324 A CN111013324 A CN 111013324A
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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
- B01D53/02—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 adsorption, e.g. preparative gas chromatography
- B01D53/04—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 adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/0407—Constructional details of adsorbing systems
- B01D53/0446—Means for feeding or distributing gases
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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
- B01D53/02—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 adsorption, e.g. preparative gas chromatography
- B01D53/04—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 adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/0454—Controlling adsorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
- B01D2259/40088—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating
- B01D2259/4009—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating using hot gas
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- Treating Waste Gases (AREA)
Abstract
The invention relates to a method for concentrating organic waste gas, which adopts a treatment device consisting of a waste gas fan, an air distribution control device, a treatment part, a waste gas exhaust device, a desorption gas source, a desorption fan and a desorption gas collecting and treating mechanism to concentrate; wherein the treatment part comprises a plurality of treatment towers which are arranged in parallel; the method realizes the concentration of the waste gas by adjusting the opening and closing of the airflow inlet and outlet to ensure that the treatment tower rotates and passes through the processes of adsorption, desorption and natural cooling; the invention realizes the circulation of adsorption, desorption and cooling of the treatment tower by switching the air flow, thereby effectively converting the low-concentration waste gas with large air volume into the low-concentration waste gas with small air volume and high concentration; meanwhile, the multiple treatment towers are in different states of adsorption, desorption and cooling through the air distribution control device, so that the rotation of each treatment tower is realized, and the waste gas treatment efficiency is improved; the method can effectively improve the concentration efficiency and increase the concentration multiple through rotation.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a concentration method of organic waste gas.
Background
With the rapid development of industry, VOC is becoming the focus of people's attention and becoming a non-negligible harmful environmental pollutant. Industries such as painting, semiconductors, LEDs, etc., generate large air volume and low concentration organic waste gas in the production process. The conventional treatment method is that an active carbon tower or a zeolite rotating wheel carries out concentration adsorption and catalytic combustion. But concomitantly as: the problems of large occupied area, low concentration multiple, poor concentration efficiency and the like are used for serving as a solution.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the waste gas concentration method with good concentration effect and high concentration efficiency.
In order to achieve the purpose, the invention adopts the technical scheme that: the method for concentrating the organic waste gas is characterized by comprising the following steps: the following processing devices are adopted for concentration processing:
the processing device comprises: the device comprises a waste gas fan, an air distribution control device, a processing part, a waste gas exhaust device, a desorption gas source, a desorption fan and a desorption gas collecting and processing mechanism; the treatment part comprises a plurality of treatment towers; each treatment tower is provided with an independent waste gas inlet, an independent waste gas outlet, an independent desorption gas inlet and an independent desorption gas outlet; the waste gas inlet is communicated with a waste gas fan in parallel through a pipeline; the waste gas outlet is communicated with a waste gas exhaust device in a parallel connection mode through a pipeline; the desorption gas inlet is communicated with a desorption gas source through a pipeline in a parallel mode; the waste gas outlet is sequentially communicated with a desorption fan and a desorption gas collecting and processing mechanism in parallel through a pipeline; the treatment tower is provided with an adsorption part, and the flow directions of the waste gas and the desorbed gas through the adsorption part are opposite; the treatment towers are respectively provided with an independent thermometer and an independent pressure gauge;
the concentration method comprises the following steps:
starting a waste gas fan, wherein waste gas passes through an air distribution control device; after analyzing the waste gas, the air distribution control device controls a waste gas inlet valve and a waste gas outlet valve of the treatment tower to be opened in sequence, so that the waste gas enters each treatment tower in sequence for adsorption treatment;
when a pressure gauge on the treatment tower displays that the pressure in the treatment tower reaches a preset adsorption saturation pressure, closing valves of a waste gas inlet and a waste gas outlet; simultaneously opening valves of a desorption gas inlet and a desorption gas outlet, and starting a desorption fan; desorption gas starts from a desorption gas source and enters a treatment tower for desorption treatment;
when a pressure gauge on the treatment tower displays that the pressure in the treatment tower reaches a preset adsorption saturation pressure, a vacuumizing device is turned on for treatment;
closing valves of a desorption gas inlet and a desorption gas outlet, and simultaneously keeping the valves of a waste gas inlet and a waste gas outlet closed to naturally cool the treatment tower; and after the temperature in the treatment tower is displayed by the thermometer on the treatment tower and reaches the set temperature, the valves of the waste gas inlet and the waste gas outlet are opened for recycling again.
Preferably, the desorption gas is compressed nitrogen, return air or air.
Preferably, the treatment device further comprises an exhaust gas pretreatment mechanism.
As a more preferable mode, the exhaust gas pretreatment mechanism includes a preliminary dust collector, a filter, and a dehumidifier.
Preferably, the adsorption part is formed of a cylindrical unit packed with a porous medium material.
More preferably, the adsorption part is annular and fixed by upper and lower supports centering on a central axis of the treatment tower.
Preferably, the desorption gas source is provided with a heating device.
Preferably, the treatment apparatus is further provided with a branch pipe for reintroducing the desorption gas concentrated with the organic waste into the treatment tower for desorption again.
As a preferable scheme, the flow rate of the desorption gas when being introduced into the treatment tower is 0.05-0.15 time of the air volume of the waste gas.
Preferably, the time for opening the vacuum extractor for processing is 2-12 hours.
The invention has the beneficial technical effects that: the waste gas concentration method has good concentration effect and high concentration efficiency. The invention realizes the circulation of adsorption, desorption and cooling of the treatment tower by switching the air flow, thereby effectively converting the low-concentration waste gas with large air volume into the low-concentration waste gas with small air volume and high concentration; meanwhile, the multiple treatment towers are in different states of adsorption, desorption and cooling through the air distribution control device, so that the rotation of each treatment tower is realized, and the waste gas treatment efficiency is improved; the method can effectively improve the concentration efficiency and increase the concentration multiple through rotation, and can be applied to organic waste gas generated in various industrial production such as coating, printing semiconductors, medicines and the like.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic structural diagram of a processing apparatus according to the present invention.
FIG. 2 is a diagram showing the relationship of the streams of four treatment columns according to the present invention.
FIG. 3 is a schematic view of a first tower according to the present invention.
FIG. 4 is a schematic view of the gas stream flow trajectory of a single tower of the present invention.
Fig. 5 is a schematic view of an exhaust gas discharge device of the present invention.
In the figure: 1 is an exhaust gas pretreatment mechanism, 2 is an exhaust gas fan, 3 is a treatment part, 31 is a first treatment tower, 32 is a second treatment tower, 33 is a third treatment tower, 34 is a fourth treatment tower, 301 is an exhaust gas inlet, 302 is an exhaust gas outlet, 303 is a desorption gas inlet, 304 is a desorption gas outlet, 305 is an adsorption part, 306 is an upper bracket, 307 is a lower bracket, 4 is an exhaust gas exhaust device, 5 is a desorption gas source, 6 is a desorption fan, 7 is a desorption gas collection treatment mechanism, 8 is a vacuumizing device, 9 is an air distribution control device, 10 is a branch pipe, D1 is a first inlet valve, D2 is a first outlet valve, D3 is a second inlet valve, D865 4 is a second outlet valve, D5 is a third inlet valve, D6 is a third outlet valve, D7 is a fourth inlet valve, D8 is a fourth outlet valve, D9 is a fifth inlet valve, D10 is a fifth outlet valve, D3874 is a sixth inlet valve, D6 is a seventh inlet valve, D12 is a seventh inlet valve, D13 is a seventh inlet valve, D366, D14 is the seventh outlet valve, D15 is the eighth inlet valve, D16 is the eighth outlet valve.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings and examples, which are given by way of illustration only, and not by way of limitation, and are not intended to limit the scope of the invention. The structures, connections and methods not described in detail in this patent are all understood to be common general knowledge in the art. It should also be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
As shown in fig. 1-5, a method for concentrating organic waste gas, which adopts the following processing devices to perform concentration treatment:
the processing device includes: the device comprises a waste gas fan 2, a waste gas pretreatment mechanism 1, an air distribution control device 9, a treatment part 3, a waste gas exhaust device 4, a desorption gas source 5, a desorption fan 6 and a desorption gas collection treatment mechanism 7; the treatment section 3 includes four treatment towers, i.e., a first treatment tower 31, a second treatment tower 32, a third treatment tower 33, and a fourth treatment tower 34.
The exhaust gas pretreatment mechanism 1 includes: the device comprises a primary dust collector for removing large granular substances and oil stains, a HEPA filter for further removing particulate matters, a dehumidifier for reducing the moisture content of the waste gas and other conventional treatment equipment according to actual requirements, and is used for pretreating the waste gas and reducing the pressure of a post-treatment tower.
Each treatment tower is of a cylindrical structure and is provided with an independent waste gas inlet 301, an independent waste gas outlet 302, an independent desorption gas inlet 303 and an independent desorption gas outlet 304; wherein, the waste gas inlet 301 and the desorption gas outlet 304 are arranged at the bottom of the tower, and the waste gas outlet 302 and the desorption gas inlet 303 are arranged at the top of the tower.
The four waste gas inlets 301 are communicated with the waste gas fan 2 in a parallel manner through pipelines (i.e. the four treatment towers are communicated with the waste gas fan 2 in a parallel manner); the four waste gas outlets 302 are communicated with the waste gas exhaust device 4 in a parallel manner through pipelines (namely, the four treatment towers are communicated with the waste gas exhaust device 4 in a parallel manner); the four desorption gas inlets 303 are communicated with the desorption gas source 5 through pipelines in a parallel manner (i.e. the four treatment towers are communicated with the desorption gas source 5 in a parallel manner); the four desorption gas outlets 304 are sequentially communicated with the desorption fan 6 and the desorption gas collecting and processing mechanism 7 through pipelines in a parallel connection manner (namely, the four processing towers are sequentially communicated with the desorption fan 6 and the desorption gas collecting and processing mechanism 7 in a parallel connection manner); and the four desorption gas outlets 304 are also connected in parallel with the vacuum extractor 8 through pipes (i.e. the four process columns are connected in parallel with the vacuum extractor 8).
Each inlet and outlet is respectively provided with a control valve; the method specifically comprises the following steps: the waste gas inlet 301 of the first treatment tower 31 is provided with a first inlet valve D1, the waste gas outlet 302 thereof is provided with a first outlet valve D2, the desorption gas inlet 303 thereof is provided with a second inlet valve D3, and the desorption gas outlet 304 thereof is provided with a second outlet valve D4; the waste gas inlet 301 of the second treatment tower 32 is provided with a third inlet valve D5, the waste gas outlet 302 thereof is provided with a third outlet valve D6, the desorption gas inlet 303 thereof is provided with a fourth inlet valve D7, and the desorption gas outlet 304 thereof is provided with a fourth outlet valve D8; the waste gas inlet 301 of the third treatment tower 33 is provided with a fifth inlet valve D9, the waste gas outlet 302 thereof is provided with a fifth outlet valve D10, the desorption gas inlet 303 thereof is provided with a sixth inlet valve D11, and the desorption gas outlet 304 thereof is provided with a sixth outlet valve D12; the waste gas inlet 301 of the fourth processing tower 34 is provided with a seventh inlet valve D13, the waste gas outlet 302 thereof is provided with a seventh outlet valve D14, the desorption gas inlet 303 thereof is provided with an eighth inlet valve D15, and the desorption gas outlet 304 thereof is provided with an eighth outlet valve D16.
Each treatment tower is provided with a plurality of adsorption parts 305, and the flow directions of the waste gas and the desorbed gas through the adsorption parts 305 are opposite; the adsorption part 305 is constituted by a cylindrical unit composed of a porous medium material; the porous medium material can be zeolite molecular sieve, activated carbon, carbon fiber and the like, and the zeolite molecular sieve and the activated carbon are preferably filled in a combined mode in the embodiment; the adsorption part 305 is formed in a ring shape, and is fixed by an upper holder 306 and a lower holder 307 around the central axis of the treatment tower. Each treatment tower is also provided with a temperature meter, a pressure meter and a flow meter to control the conditions in the tower.
The exhaust gas discharge device 4 is a discharge pipe.
The desorption gas used by the desorption gas source 5 is compressed nitrogen, and return air or air can also be used. And a heating device is arranged on a pipeline between the desorption gas source 5 and the treatment tower and is used for heating desorption gas, so that the desorption efficiency is improved.
A branch 10 is additionally provided to reintroduce the stripping gas enriched with organic waste into the treatment column for desorption again.
The organic waste gas concentration method comprises the following steps:
(1) starting the waste gas fan 2, treating the organic waste gas from a waste gas source by the waste gas pretreatment mechanism 1, and then feeding the organic waste gas into the air distribution control device 12; the air distribution control device 12 is controlled by a PLC, analyzes the intake air amount, whether the pollutant discharge is continuous, the pollutant concentration and the like by a conventional means, and then controls to open the valves (D1, D5, D9, D13) of the waste gas inlets and the valves (D2, D6, D10, D14) of the waste gas outlets of the first treating tower 31, the second treating tower 32, the third treating tower 33 and the fourth treating tower 34 in sequence according to the analysis result, thereby reasonably allocating the waste gas to each treating tower for treatment.
(2) Firstly, carrying out adsorption treatment on waste gas in a treatment tower; when a pressure gauge on the treatment tower displays that the pressure in the treatment tower reaches a preset adsorption saturation pressure, valves of the waste gas inlet 301 and the waste gas outlet 302 are closed; simultaneously opening valves of a desorption gas inlet 303 and a desorption gas outlet 304, and starting a desorption fan 6 and a heating device; the desorption gas starts from a desorption gas source 5, and enters a treatment tower for desorption treatment after being heated; controlling the flow rate of the desorption gas to be introduced into the treatment tower at 0.05-0.15 times of the air volume of the waste gas, and enabling the desorption gas (namely organic concentrated gas) with concentrated organic waste to leave the treatment tower and enter a desorption gas collection and treatment mechanism 7 for further treatment; the flow of the desorption gas is controlled to be 0.05-0.1 time of the air quantity of the waste gas, and the pollutant concentration is 15-20 times of the initial waste gas pollutant concentration; in addition, the desorbed gas with part of the concentrated organic waste is returned to the treatment tower through the branch pipe 10, and the desorption process is continued, so that the waste gas is concentrated in multiples.
(3) And when the pressure gauge on the treatment tower displays that the pressure in the treatment tower reaches the preset adsorption saturation pressure, opening the vacuumizing device 8 and treating for 2-12 hours.
(4) Closing valves of a desorption gas inlet 303 and a desorption gas outlet 304, and simultaneously keeping the valves of an exhaust gas inlet 301 and an exhaust gas outlet 302 closed, so that the treatment tower is naturally cooled; when the temperature in the treatment tower is shown to reach the room temperature by the thermometer on the treatment tower, the valves of the waste gas inlet 301 and the waste gas outlet 302 are opened for the circulation again.
Due to the arrangement of the air distribution control device 9, the waste gas reasonably enters the first treatment tower 31, the second treatment tower 32, the third treatment tower 33 and the fourth treatment tower 34 in sequence; therefore, when the system runs stably, each treatment tower is in different states of adsorption, desorption and cooling, the rotation of each treatment tower is realized, and the waste gas treatment efficiency is improved.
In light of the foregoing description of the preferred embodiment of the present invention, it is to be understood that various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. A method for concentrating organic waste gas is characterized in that: the following processing devices are adopted for concentration processing:
the processing device comprises: the device comprises a waste gas fan, an air distribution control device, a processing part, a waste gas exhaust device, a desorption gas source, a desorption fan and a desorption gas collecting and processing mechanism; the treatment part comprises a plurality of treatment towers; each treatment tower is provided with an independent waste gas inlet, an independent waste gas outlet, an independent desorption gas inlet and an independent desorption gas outlet; the waste gas inlet is communicated with a waste gas fan in parallel through a pipeline; the waste gas outlet is communicated with a waste gas exhaust device in a parallel connection mode through a pipeline; the desorption gas inlet is communicated with a desorption gas source through a pipeline in a parallel mode; the waste gas outlet is sequentially communicated with a desorption fan and a desorption gas collecting and processing mechanism in parallel through a pipeline; the treatment tower is provided with an adsorption part, and the flow directions of the waste gas and the desorbed gas through the adsorption part are opposite; the treatment towers are respectively provided with an independent thermometer and an independent pressure gauge;
the concentration method comprises the following steps:
starting a waste gas fan, wherein waste gas passes through an air distribution control device; after analyzing the waste gas, the air distribution control device controls a waste gas inlet valve and a waste gas outlet valve of the treatment tower to be opened in sequence, so that the waste gas enters each treatment tower in sequence for adsorption treatment;
when a pressure gauge on the treatment tower displays that the pressure in the treatment tower reaches a preset adsorption saturation pressure, closing valves of a waste gas inlet and a waste gas outlet; simultaneously opening valves of a desorption gas inlet and a desorption gas outlet, and starting a desorption fan; desorption gas starts from a desorption gas source and enters a treatment tower for desorption treatment;
when a pressure gauge on the treatment tower displays that the pressure in the treatment tower reaches a preset adsorption saturation pressure, a vacuumizing device is turned on for treatment;
closing valves of a desorption gas inlet and a desorption gas outlet, and simultaneously keeping the valves of a waste gas inlet and a waste gas outlet closed to naturally cool the treatment tower; and after the temperature in the treatment tower is displayed by the thermometer on the treatment tower and reaches the set temperature, the valves of the waste gas inlet and the waste gas outlet are opened for recycling again.
2. The method for concentrating an organic waste gas according to claim 1, wherein: the desorption gas is compressed nitrogen, return air or air.
3. The method for concentrating an organic waste gas according to claim 1, wherein: the treatment device also comprises an exhaust gas pretreatment mechanism.
4. The method for concentrating organic waste gas according to claim 3, characterized in that: the waste gas pretreatment mechanism comprises a primary dust remover, a filter and a dehumidifier.
5. The method for concentrating an organic waste gas according to claim 1, wherein: the adsorption part is composed of cylindrical units filled with porous medium materials.
6. The method for concentrating an organic waste gas according to claim 5, wherein: the adsorption part is annular, takes the central axis of the treatment tower as the center and is fixed by an upper bracket and a lower bracket.
7. The method for concentrating an organic waste gas according to claim 1, wherein: the desorption gas source is provided with a heating device.
8. The method for concentrating an organic waste gas according to claim 1, wherein: the treatment apparatus is further provided with a branch pipe for reintroducing the desorption gas concentrated with the organic waste into the treatment tower for desorption again.
9. The method for concentrating an organic waste gas according to claim 1, wherein: the flow rate of the desorption gas when being introduced into the treatment tower is 0.05-0.15 time of the air volume of the waste gas.
10. The method for concentrating an organic waste gas according to claim 1, wherein: the time for opening the vacuumizing device to process is 2-12 hours.
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| CN201911396760.8A CN111013324A (en) | 2019-12-30 | 2019-12-30 | Concentration method of organic waste gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112892166A (en) * | 2021-01-22 | 2021-06-04 | 西安交通大学 | System and method for eliminating harmful gas in closed space |
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| CN208824192U (en) * | 2018-08-02 | 2019-05-07 | 中南大学 | A kind of VOCs exhaust-gas efficient adsorption/desorption catalyzing burning processing system |
| CN209341276U (en) * | 2018-12-29 | 2019-09-03 | 东莞市恒升环保科技有限公司 | A kind of organic exhaust gas adsorption desorption catalyzing burner |
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2019
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| CA1339833C (en) * | 1987-03-04 | 1998-04-21 | Dusanka Filipovic | Process for the recovery of halogenated hydrocarbons in a gas stream |
| EP3075433A1 (en) * | 2015-04-03 | 2016-10-05 | Ingersoll-Rand Company | Blower purge dryer with cooling apparatus and methology |
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Application publication date: 20200417 |