CN116440647A - Multistage distributed low-boiling-point VOCs combined adsorption box - Google Patents

Multistage distributed low-boiling-point VOCs combined adsorption box Download PDF

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Publication number
CN116440647A
CN116440647A CN202310313155.XA CN202310313155A CN116440647A CN 116440647 A CN116440647 A CN 116440647A CN 202310313155 A CN202310313155 A CN 202310313155A CN 116440647 A CN116440647 A CN 116440647A
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CN
China
Prior art keywords
pipe
adsorption
distribution pipe
box
waste gas
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310313155.XA
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Chinese (zh)
Inventor
徐永生
李玉成
王新平
孙荣敏
王丽萍
杨建伟
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Shandong Mosu Ecology Co ltd
Shandong Moris Environmental Industry Co ltd
Original Assignee
Shandong Mosu Ecology Co ltd
Shandong Moris Environmental Industry Co ltd
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Priority to CN202310313155.XA priority Critical patent/CN116440647A/en
Publication of CN116440647A publication Critical patent/CN116440647A/en
Pending legal-status Critical Current

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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
    • 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
    • B01D53/0438—Cooling or heating systems
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/102—Carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/116—Molecular sieves other than zeolites
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

The invention discloses a multistage distributed low-boiling-point VOCs combined adsorption box, which relates to the technical field of VOCs treatment and comprises a box body, core adsorption units and auxiliary adsorption units, wherein a plurality of core adsorption units are arranged in the box body, the auxiliary adsorption units are arranged between the core adsorption units and the box body, each core adsorption unit comprises a distribution pipe, a molecular sieve buffer layer arranged in the distribution pipe, an isolation screen layer sleeved outside the distribution pipe and a carbon fiber layer arranged between the distribution pipe and the isolation screen layer, the top end of each distribution pipe is connected with a cooling air inlet pipe, the cooling air inlet pipe is connected with a cold air gun, the bottom end of each distribution pipe is connected with a regeneration medium/waste gas inlet pipe, a plurality of through holes are formed in the peripheral surface of each distribution pipe, a regeneration medium outlet pipe and a waste gas outlet pipe are arranged at the top of the box body, and a cooling air outlet pipe is arranged at the bottom of the box body. The invention can reduce the cooling time after regeneration and improve the adsorption effect.

Description

Multistage distributed low-boiling-point VOCs combined adsorption box
Technical Field
The invention relates to the technical field of VOCs treatment, in particular to a multistage distributed low-boiling-point VOCs combined adsorption box.
Background
The adsorption recovery technology is the widest technology adopted at present for chemical waste gas, the effect of the adsorption equipment for treating the tail gas is greatly affected by the adsorbent, but the internal structure of the adsorption device is directly related to the treatment efficiency of the adsorption device on the tail gas, the existing adsorber has a certain capability of adsorbing and recovering VOCs, and the basic thinking about VOCs treatment is to recover the waste gas and recycle the waste gas according to the resource attribute and the energy attribute of volatile gas of the VOCs in consideration of recycling. The core principle of removing VOCs by using an absorber in the adsorption method is as follows: and the adsorbent with a porous structure and a very large specific surface area in the adsorber is used for trapping VOCs molecules. As the exhaust gas passes through the adsorbent bed, VOCs are adsorbed within the pores, allowing the gas to be purified. The adsorber is generally used for controlling VOCs in a physical adsorption mode, the adsorption process is reversible, after the adsorption reaches saturation, the adsorbent can be desorbed by using water vapor, and the VOCs are recovered by condensation and distillation after the desorption, so that the adsorbent can be recycled after regeneration. The adsorption effect is mainly dependent on the nature of the adsorbent, the type and concentration of VOCs, the operating temperature, humidity, pressure, etc. of the adsorption system.
The existing adsorbers mainly have the following problems:
1. the carbon fiber is slowly cooled after regeneration, and a long period of cooling time is required;
2. the carbon fiber of the conventional adsorption box is incompletely applied during adsorption, the adsorption is incomplete, and the adsorption effect can be reduced.
Disclosure of Invention
The invention aims to provide a multistage distributed low-boiling-point VOCs combined adsorption box, so as to solve the problems in the prior art, reduce the cooling time after regeneration and improve the adsorption effect.
In order to achieve the above object, the present invention provides the following solutions:
the invention provides a multistage distributed low-boiling-point VOCs combined adsorption box which comprises a box body, a core adsorption unit and auxiliary adsorption units, wherein a plurality of core adsorption units are arranged in the box body, the auxiliary adsorption units are arranged between the core adsorption units and the box body, each core adsorption unit comprises a distribution pipe, a molecular sieve buffer layer arranged in the distribution pipe, an isolation screen layer sleeved outside the distribution pipe and a carbon fiber layer arranged between the distribution pipe and the isolation screen layer, the top end of each distribution pipe is connected with a cooling air inlet pipe, the cooling air inlet pipe is connected with a cold air gun, the bottom end of each distribution pipe is connected with a regeneration medium/waste gas inlet pipe, a plurality of through holes are formed in the peripheral surface of each distribution pipe, a regeneration medium outlet pipe and a waste gas outlet pipe are arranged at the top of the box body, and a cooling air outlet pipe is arranged at the bottom of the box body.
Preferably, the bottom of the box body is also provided with a liquid seal U-shaped pipe, one end of the liquid seal U-shaped pipe is communicated with the inside of the box body, and the other end of the liquid seal U-shaped pipe is communicated with the outside.
Preferably, the auxiliary adsorption unit is a polymer adsorption material.
Preferably, the isolation screen layer is a metallic material.
Preferably, each of the through holes is uniformly distributed on the outer circumferential surface of the distribution pipe.
Preferably, the top end and the bottom end of the distribution pipe are respectively connected with the cooling air inlet pipe and the regeneration medium/exhaust gas inlet pipe through sleeve openings.
Preferably, the box body is assembled and spliced by adopting a spliced structure.
Compared with the prior art, the invention has the following technical effects:
the invention provides a multistage distributed low-boiling-point VOCs combined adsorption box, VOCs waste gas enters a core adsorption unit from a regeneration medium/waste gas inlet pipe, a molecular sieve buffer layer carries out preliminary pretreatment on the waste gas, the air speed is reduced, the waste gas is distributed more uniformly, then an outer carbon fiber layer is used for further adsorbing the waste gas, the application of the carbon fiber is complete, the waste gas is adsorbed through an auxiliary adsorption unit after passing through the carbon fiber layer, the waste gas is distributed more uniformly through layer-by-layer buffering and adsorption, the adsorption is more complete, the low-boiling-point VOCs are completely treated, and the adsorption effect is improved. When the carbon fiber layer is subjected to regeneration treatment, introducing a regeneration medium into a core adsorption unit through a regeneration medium/waste gas inlet pipe, carrying out desorption regeneration on the carbon fiber layer, and recovering VOCs through subsequent treatment after the desorption; after desorption, cooling is carried out, cooling air enters the distribution pipe after being cooled by the cold air gun, all parts are cooled from inside to outside, and the cooling time after regeneration is reduced by distributing the cold air in the cold air gun for a plurality of times.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are 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 other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a multistage distributed low-boiling-point VOCs combined adsorption tank provided by the invention;
FIG. 2 is a top partial cross-sectional view of a multi-stage distributed low boiling point VOCs combination adsorption tank provided by the invention;
FIG. 3 is a schematic diagram of a core adsorption unit according to the present invention;
FIG. 4 is a partial cross-sectional view of a core adsorption unit according to the present invention;
in the figure: 1-box, 2-core adsorption unit, 3-auxiliary adsorption unit, 4-distribution pipe, 5-molecular sieve buffer layer, 6-isolation screen layer, 7-carbon fiber layer, 8-cooling air inlet pipe, 9-air gun, 10-regeneration medium/waste gas intake pipe, 11-through hole, 12-regeneration medium outlet pipe, 13-waste gas outlet pipe, 14-cooling air outlet pipe, 15-liquid seal U-shaped pipe, 16-sleeve mouth.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a multistage distributed low-boiling-point VOCs combined adsorption box, which solves the problems in the prior art, can reduce the cooling time after regeneration and improves the adsorption effect.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
As shown in fig. 1-4, this embodiment provides a multi-stage distributed low boiling point VOCs combined adsorption box, which comprises a box body 1, a core adsorption unit 2 and an auxiliary adsorption unit 3, wherein a plurality of core adsorption units 2 are arranged in the box body 1, the auxiliary adsorption unit 3 is arranged between the core adsorption unit 2 and the box body 1, the core adsorption unit 2 comprises a distribution pipe 4, a molecular sieve buffer layer 5 arranged in the distribution pipe 4, an isolation screen layer 6 sleeved outside the distribution pipe 4 and a carbon fiber layer 7 arranged between the distribution pipe 4 and the isolation screen layer 6, the top ends of the distribution pipes 4 are connected with cooling air inlet pipes 8, the cooling air inlet pipes 8 are connected with air guns 9, the bottom ends of the distribution pipes 4 are connected with regeneration medium/waste gas inlet pipes 10, a plurality of through holes 11 are arranged on the peripheral surface of the distribution pipes 4, a regeneration medium outlet pipe 12 and a waste gas outlet pipe 13 are arranged at the top of the box body 1, and a cooling air outlet pipe 14 is arranged at the bottom of the box body 1.
When adsorbing, VOCs waste gas gets into core adsorption unit 2 by regeneration medium/waste gas intake pipe 10, preliminary treatment is carried out to the waste gas to molecular sieve buffer layer 5, make waste gas distribution more even when reducing the wind speed, then carry out further absorption to the waste gas by outer carbon fiber layer 7, use completely when guaranteeing carbon fiber and adsorb, waste gas behind carbon fiber layer 7, residual VOCs adsorbs through supplementary adsorption unit 3, through layer upon layer buffering and the absorption to the waste gas, make waste gas distribution more even, adsorb more fully, realize handling completely to low boiling point VOCs, improve the adsorption effect, after the absorption is accomplished, waste gas is discharged by waste gas outlet pipe 13. When the carbon fiber layer 7 is subjected to regeneration treatment, a regeneration medium is introduced into the core adsorption unit 2 through the regeneration medium/waste gas inlet pipe 10, desorption regeneration is carried out on the carbon fiber layer 7, after the desorption, the regeneration medium is discharged through the regeneration medium outlet pipe 12 and then subjected to post-treatment, and VOCs are recovered; after desorption, cooling is performed, cooling air enters the distribution pipe 4 after being cooled by the cold air gun 9, all parts are cooled from inside to outside, the cooling air is discharged from the cooling air outlet pipe 14 at the bottom, and the cooling time after regeneration is reduced by distributing the cooling air in the cold air gun 9 for a plurality of times.
Wherein, the regeneration medium can be hot nitrogen or steam, and is preferably hot nitrogen. Most of the activated carbon has hydrophobicity, but because the water vapor has higher relative pressure and smaller molecular weight than VOCs, the water vapor is easier to diffuse and is preferentially adsorbed by the activated carbon column, and the measurement result of the gas concentration at the outlet of the adsorption column obtained by using the thermal conductivity detector shows that the water vapor penetrates through the adsorption column earlier than the VOCs and leaves a highest point on the penetration curve of the water vapor. Therefore, in the binary competitive adsorption of VOCs, water vapor and activated carbon, the adsorption of water vapor is dominant. The binary adsorption balance of VOCs, water vapor and active carbon can be simplified into two steps that (1) water vapor is preferentially adsorbed on active carbon; (2) VOCs adsorb and replace part of the water on the activated carbon which has adsorbed the water vapor. And the problem of high humidity can not occur when hot nitrogen is selected for desorption. And heating nitrogen in the desorption system to the temperature required by desorption through a heater, then enabling the nitrogen to enter the core adsorption unit 2 for reverse desorption, condensing and recycling the desorbed gas through a condenser, and sending the uncondensed gas back to the heater through a circulating fan for heating and then desorbing. The amount of material adsorbed decreases with increasing temperature, and increasing the temperature of the adsorbent causes the adsorbed components to desorb, also known as temperature swing desorption.
The core adsorption unit 2 and the box body adopt detachable loop structures, so that maintenance and replacement are convenient.
In this embodiment, the bottom of the box 1 is further provided with a liquid seal U-shaped tube 15, one end of the liquid seal U-shaped tube 15 is communicated with the inside of the box 1, and the other end is communicated with the outside. In the desorption stage, the waste liquid generated by the steam can be discharged through the liquid seal U-shaped pipe 15, and the waste liquid can be discharged while the tightness of the equipment is ensured.
In this embodiment, the auxiliary adsorption unit 3 is a polymer adsorption material, and has a good adsorption effect on VOCs.
In this embodiment, the isolation screen layer 6 is a metallic material, preferably 304 stainless steel, which is corrosion resistant.
In this embodiment, the through holes 11 are uniformly distributed on the outer peripheral surface of the distribution pipe 4, so that the exhaust gas is more uniformly distributed.
In this embodiment, the top and bottom ends of the distribution pipe 4 are connected to the cooling air inlet pipe 8 and the regeneration medium/exhaust gas inlet pipe 10 through the cuffs 16, respectively, and the connection is performed by using the cuffs, which is convenient and quick to install.
In this embodiment, the box 1 adopts the concatenation formula structure to assemble the concatenation, can select the number of installing the box according to amount of wind, concentration, and the installation mode is more convenient, and the selection type of equipment is more nimble.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.

Claims (7)

1. Multistage distributed low boiling VOCs combination adsorption case, its characterized in that: including box, core adsorption unit and auxiliary adsorption unit, set up a plurality of in the box the core adsorption unit, the core adsorption unit with set up between the box auxiliary adsorption unit, the core adsorption unit include the distribution pipe, set up in molecular sieve buffer layer in the distribution pipe, the cover locate the outer isolation screen layer of distribution pipe and set up in the distribution pipe with the carbon fiber layer between the isolation screen layer, each the cooling air inlet pipe is connected to the distribution pipe top, be connected with the cold air rifle on the cooling air inlet pipe, each the regeneration medium/waste gas intake pipe is connected to the distribution pipe bottom, each be equipped with a plurality of through-holes on the distribution pipe outer peripheral face, the box top sets up regeneration medium outlet pipe and waste gas outlet pipe, the box bottom sets up the cooling air outlet pipe.
2. The multi-stage distributed low boiling VOCs combined adsorption box according to claim 1, wherein: the box bottom is also provided with a liquid seal U-shaped pipe, one end of the liquid seal U-shaped pipe is communicated with the inside of the box, and the other end of the liquid seal U-shaped pipe is communicated with the outside.
3. The multi-stage distributed low boiling VOCs combined adsorption box according to claim 1, wherein: the auxiliary adsorption unit is made of a polymer adsorption material.
4. The multi-stage distributed low boiling VOCs combined adsorption box according to claim 1, wherein: the isolation screen layer is made of metal materials.
5. The multi-stage distributed low boiling VOCs combined adsorption box according to claim 1, wherein: the through holes are uniformly distributed on the peripheral surface of the distribution pipe.
6. The multi-stage distributed low boiling VOCs combined adsorption box according to claim 1, wherein: the top end and the bottom end of the distribution pipe are respectively connected with the cooling air inlet pipe and the regeneration medium/waste gas inlet pipe through sleeve openings.
7. The multi-stage distributed low boiling VOCs combined adsorption box according to claim 1, wherein: the box adopts the concatenation formula structure to assemble the concatenation.
CN202310313155.XA 2023-03-28 2023-03-28 Multistage distributed low-boiling-point VOCs combined adsorption box Pending CN116440647A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310313155.XA CN116440647A (en) 2023-03-28 2023-03-28 Multistage distributed low-boiling-point VOCs combined adsorption box

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310313155.XA CN116440647A (en) 2023-03-28 2023-03-28 Multistage distributed low-boiling-point VOCs combined adsorption box

Publications (1)

Publication Number Publication Date
CN116440647A true CN116440647A (en) 2023-07-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
CN (1) CN116440647A (en)

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