CN114699913A - Photocatalytic oxidation waste gas treatment equipment and control method thereof - Google Patents

Photocatalytic oxidation waste gas treatment equipment and control method thereof Download PDF

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CN114699913A
CN114699913A CN202210473719.1A CN202210473719A CN114699913A CN 114699913 A CN114699913 A CN 114699913A CN 202210473719 A CN202210473719 A CN 202210473719A CN 114699913 A CN114699913 A CN 114699913A
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chamber
gas
plate
adsorption
activated carbon
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CN114699913B (en
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林小英
齐崇辉
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Fujian University of Technology
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Fujian University of Technology
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    • 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
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    • B01D—SEPARATION
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    • B01D53/30—Controlling by gas-analysis apparatus
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    • 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
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    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract

The invention relates to photocatalytic oxidation waste gas treatment equipment which comprises a treatment chamber, an adsorption system, an air inlet system, an air outlet system, a desorption system, a circulating system, a catalytic system and an oxidation system, wherein the air inlet system and the air outlet system are respectively arranged at two sides of the adsorption system, and activated carbon in the desorption system is sucked into the circulation chamber by the circulating system through an air pump and falls into the adsorption system; VOC gas is from air intake system input adsorption system by activated carbon adsorption, and the gas after the purification is got rid of from the system of giving vent to anger, and absorbent activated carbon falls into desorption system, by ozone desorption play gas, sinks into catalytic system, discharges after catalytic oxidation, and the technical scheme above adopting need not the combustion chamber, and absorption, desorption, catalysis and oxidation go on simultaneously, and cyclic utilization activated carbon's photocatalytic oxidation exhaust-gas treatment equipment.

Description

Photocatalytic oxidation waste gas treatment equipment and control method thereof
Technical Field
The invention relates to the field of VOC gas recovery, and particularly relates to photocatalytic oxidation waste gas treatment equipment and a control method thereof.
Background
Volatile Organic Compounds (VOC) are common and ubiquitous atmospheric pollutants in the atmosphere. The common components include hydrocarbons, benzenes, alcohols, ketones, phenols, aldehydes, esters, amines, nitriles (cyanides), and the like. VOC (volatile organic compounds) undergoes a photochemical reaction under the action of illumination, can cause photochemical smog, secondary organic aerosol and increase of atmospheric organic acid, can destroy the ozone layer, is an important reason for forming haze weather (PM2.5), and can also show certain toxicity, irritation and carcinogenicity, thereby causing great influence on human health.
The industrial waste gas in the existing air pollution prevention and control law of the people's republic of China is defined as the waste gas containing volatile organic compounds which is discharged by related enterprises for producing, importing, selling and using raw materials and products containing the volatile organic compounds, and the waste gas treatment is to treat the waste gas by using chemical, physical, biological and other methods, so that the waste gas can meet the requirements in the comprehensive emission standard of air pollutants.
The existing VOC adsorption catalysis equipment has overlarge volume, and can rarely realize the integration of adsorption, desorption and catalysis and simultaneously carry out. And the existing VOC adsorption catalysis equipment comprises a combustion chamber, which is not environment-friendly.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the photocatalytic oxidation waste gas treatment equipment which does not need a combustion chamber, can simultaneously carry out adsorption, desorption, catalysis and oxidation and can circularly utilize activated carbon.
The invention relates to a photocatalytic oxidation waste gas treatment device, which adopts the following technical scheme: it includes:
a processing chamber;
the adsorption system is arranged in the treatment chamber and comprises a top plate, a bottom plate, a cylinder and activated carbon, wherein the top plate and the bottom plate are respectively abutted and connected with the side wall of the treatment chamber to form an adsorption chamber; the top plate and the bottom plate are respectively hinged on the side wall of the treatment chamber, activated carbon is placed on the top plate and the bottom plate, the air cylinders are respectively arranged at the bottoms of the top plate and the bottom plate, the fixed ends of the air cylinders are fixedly connected with the side wall of the treatment chamber, and the movable ends are respectively hinged with the bottoms of the top plate and the bottom plate;
the gas inlet system is arranged outside the treatment cavity and comprises a gas inlet pipe and a gas filter, wherein a first gas valve is arranged on the gas inlet pipe, the gas inlet pipe is communicated with a gas inlet of the gas filter, and a gas outlet of the gas filter is communicated with one side of the adsorption cavity;
the gas outlet system is arranged outside the treatment cavity and comprises a gas outlet pipe and a VOC concentration detector, wherein a gas inlet of the VOC concentration detector is communicated with the other side of the adsorption cavity, a gas outlet of the VOC concentration detector is communicated with the gas outlet pipe, and a gas valve II is arranged on the gas outlet pipe;
the desorption system is arranged in the treatment cavity, is positioned below the adsorption cavity and comprises a funnel-shaped placing plate, an ozone vent pipe and an ozone generator; the funnel-shaped placing plate comprises an expanding opening, a reducing opening and an inclined side plate, the expanding opening corresponds to the bottom plate of the adsorption system, the edge of the expanding opening is fixedly connected with the side wall of the treatment chamber, a switch valve is arranged at the reducing opening, and the bottom plate of the adsorption system, the funnel-shaped placing plate and the side wall of the treatment chamber form a desorption chamber; a plurality of vent holes are formed in the inclined side plate, and the inner diameter of each vent hole is smaller than the outer diameter of the activated carbon; the ozone generator is arranged outside the treatment cavity; one end of the ozone vent pipe is communicated with the air outlet of the ozone generator, and the other end of the ozone vent pipe is communicated with the desorption chamber through the side wall of the treatment chamber;
the circulating system is arranged in the processing chamber and comprises a communicating pipe and an air pump, and a top plate of the adsorption system, a top wall of the processing chamber and a side wall of the processing chamber form a circulating chamber; active carbon is placed on the top plate; one end of the communicating pipe is connected with a switch valve of the desorption system, and the other end of the communicating pipe is communicated with the circulating chamber through an air pump;
the catalytic system is arranged in the treatment chamber and is positioned below the desorption chamber, and a funnel-shaped placing plate of the desorption system, the side wall of the treatment chamber and the bottom wall of the treatment chamber form a catalytic chamber; an ultraviolet lamp post, a heating lamp tube, a catalyst and a catalyst placing plate are arranged in the catalysis chamber; the ultraviolet lamp post is fixed on the bottom wall of the processing chamber; the catalyst placing plate is a spiral plate surrounding the ultraviolet lamp post, the inner side of the catalyst placing plate is connected with the ultraviolet lamp post in an abutting mode, the outer side of the catalyst placing plate is connected with the side wall of the treatment chamber in an abutting mode, and a catalyst is placed on the catalyst placing plate; a plurality of heating lamp tubes are arranged on the side wall of the treatment chamber at intervals with the connection of the outer side of the catalyst placing plate, and a water outlet is formed in the bottom wall of the treatment chamber corresponding to the bottom of the spiral plate;
the oxidation system is arranged outside the treatment cavity and comprises a carbon dioxide absorption chamber and an ozone degradation chamber, wherein the air inlet of the carbon dioxide absorption chamber corresponds to the bottom of the spiral plate and is communicated with the catalysis cavity, the air outlet of the carbon dioxide absorption chamber is communicated with the air inlet of the ozone degradation chamber, and the air outlet of the ozone degradation chamber is communicated with the atmosphere.
The gas filter further comprises an ear chamber, the ear chamber is arranged between the gas outlet of the gas filter and one side of the adsorption chamber, one side of the ear chamber is communicated with the gas outlet, the other side of the ear chamber is communicated with the adsorption chamber, and the top wall and the bottom wall of the ear chamber are respectively flush with the top plate and the bottom plate; the earchamber is provided with a non-uniform porous plate corresponding to the adsorption chamber, and the aperture of the non-uniform porous plate is gradually increased along the direction from the center to the periphery.
Further, the uneven porous plate is arranged corresponding to the shape of the side wall of the processing chamber, and the periphery of the uneven porous plate is connected with the top wall, the bottom wall and the side wall of the ear chamber.
Further, the uneven porous plate is provided with small holes, medium holes and large holes along the direction from the center to the periphery.
Further, the aperture ratio of the uneven porous plate was 38.8%, the aperture of the large hole was 50mm, the aperture of the medium hole was 30mm, and the aperture of the small hole was 15 mm.
Further, roof and bottom plate are along a plurality of platelet concatenation shaping of center partition setting, the lateral wall of lateral wall one side articulated processing chamber of processing chamber is corresponded to the platelet, the cylinder stiff end is articulated with the lateral wall fixed connection of processing chamber, and the expansion end is articulated with the platelet bottom.
Further, the amount of the activated carbon placed on the bottom plate and the top plate is equal.
Further, the catalyst is TiO2。
Further, the system also comprises a control system, wherein the control system comprises a first photoelectric sensor, a second photoelectric sensor, a concentration sensor and a PLC; the first photoelectric sensor and the concentration sensor are arranged at the bottom of the adsorption chamber and are respectively and fixedly connected to the side wall of the treatment chamber; the photoelectric sensor II is arranged at the bottom of the circulating chamber and is fixedly connected to the side wall of the processing chamber; the PLC is respectively and electrically connected with the first photoelectric sensor, the second photoelectric sensor, the concentration sensor, the cylinder, the first air valve, the second air valve, the VOC concentration detector, the air pump, the switch valve, the ozone generator and the air filter.
A control method of a photocatalytic oxidation exhaust gas treatment device, which applies the photocatalytic oxidation exhaust gas treatment device, comprises the following steps:
s1, opening a first air valve of the air inlet pipe and the gas filter under the control of the PLC, filtering the VOC gas by the gas filter, and then feeding the filtered VOC gas into an ear chamber, wherein the filtered VOC gas enters an adsorption chamber through a non-uniform porous plate;
s2, detecting the concentration of the filtered VOC gas in the adsorption cavity by a concentration sensor, and when the concentration of the filtered VOC gas reaches an activated carbon adsorption saturation value, transmitting a signal to a PLC (programmable logic controller), wherein the PLC controls a gas valve I of a gas inlet pipe and a gas filter to be closed;
s3, adsorbing the filtered VOC gas by using activated carbon, detecting the content of the filtered VOC gas in the adsorption chamber by using a VOC concentration detector, and when the content is lower than a dischargeable standard, transmitting a signal to a PLC (programmable logic controller), wherein the PLC controls a second air valve of an air outlet pipe to be opened to discharge the purified gas; meanwhile, the PLC controls the cylinder connected with the bottom plate to contract, and the activated carbon falls onto the funnel-shaped placing plate in the desorption chamber;
s4, after all the activated carbon on the bottom plate falls, the first photoelectric sensor transmits signals to the PLC, the PLC controls the cylinder connected with the bottom plate to extend, then controls the second air valve of the air outlet pipe to close, and controls the cylinder connected with the top plate to contract, so that the activated carbon on the top plate falls onto the bottom plate, when all the activated carbon on the top plate falls, the second photoelectric sensor transmits signals to the PLC, and the PLC controls the cylinder connected with the top plate to extend;
s5, the PLC controls the ozone generator to be started, ozone is conveyed to the desorption chamber through the ozone vent pipe, filtered VOC gas in the activated carbon is desorbed, and the desorbed gas sinks into the catalysis chamber through the vent holes in the funnel-shaped placing plate;
s6, making the desorbed gas sink into the catalytic chamber pass through a catalyst placing plate with a catalyst, and oxidizing the desorbed gas into CO under the illumination of an ultraviolet lamp post and a heating lamp tube2And H2O，CO2And the residual ozone is absorbed by the carbon dioxide absorption chamber and degraded by the ozone degradation chamber, H2And O is discharged from a water outlet below, and the PLC controls to open the switch valve and the air pump so as to convey the activated carbon on the funnel-shaped placing plate to a top plate of the circulating chamber.
Compared with the prior art, the invention has the following beneficial effects:
1. the air pump is matched with the pipeline to recycle the activated carbon, so that the activated carbon is recycled, a combustion chamber is not required to be arranged, and the adsorption, desorption, catalysis and oxidation functions are integrated, so that the energy consumption is greatly reduced, and the resources are saved;
2. the catalysis chamber is a spiral placing layer, an ultraviolet lamp post is arranged in the middle, and a heating lamp is arranged on the side wall, so that the photocatalysis efficiency is greatly accelerated;
3. the inlet is provided with an uneven porous plate structure, air flow in the adsorption cavity is uniformly distributed, the conditions that the flow velocity is large in the middle and the flow velocities on the two sides are small are changed, and the utilization efficiency of the activated carbon is improved.
Drawings
The accompanying drawings, which are described herein to provide a further understanding of the application, are included in the following description:
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic diagram of a non-uniform cellular board structure according to an embodiment of the present invention;
FIG. 3 is a block diagram of a control system according to an embodiment of the present invention;
fig. 4 is a flowchart of a control method according to an embodiment of the invention.
Detailed Description
Referring to one of fig. 1 to 4, an embodiment is a photocatalytic oxidation exhaust gas treatment apparatus including:
a processing chamber 1;
the adsorption system is arranged in the processing chamber 1 and comprises a top plate 121, a bottom plate 122, a cylinder 123 and activated carbon, wherein the top plate 121 and the bottom plate 122 are respectively abutted against the side wall of the processing chamber 1 to form an adsorption chamber 12; the top plate 121 and the bottom plate 122 are respectively hinged to the side wall of the processing chamber 1, activated carbon is placed on the top plate 121 and the bottom plate 122, the air cylinders 123 are respectively arranged at the bottoms of the top plate 121 and the bottom plate 122, the fixed ends of the air cylinders 123 are fixedly connected with the side wall of the processing chamber 1, and the movable ends are respectively hinged to the bottoms of the top plate 121 and the bottom plate 122;
the gas inlet system is arranged outside the treatment chamber 1 and comprises a gas inlet pipe 21 and a gas filter 22, a first gas valve 23 is arranged on the gas inlet pipe 21, the gas inlet pipe 21 is connected with a gas inlet of the gas filter 22, and a gas outlet of the gas filter 22 is communicated with one side of the adsorption chamber 12;
the gas outlet system is arranged outside the treatment chamber 1 and comprises a gas outlet pipe 32 and a VOC concentration detector 31, a gas inlet of the VOC concentration detector 31 is communicated with the other side of the adsorption chamber 12, a gas outlet of the VOC concentration detector 31 is communicated with the gas outlet pipe 32, and a gas valve II 33 is arranged on the gas outlet pipe 32;
a desorption system which is arranged in the processing chamber 1 and below the adsorption chamber 12 and comprises a funnel-shaped placing plate 131, an ozone vent pipe 52 and an ozone generator 51; the funnel-shaped placing plate 131 comprises a flared opening, a reduced opening and inclined side plates, the flared opening corresponds to the bottom plate 52 of the adsorption system, the edge of the flared opening is fixedly connected with the side wall of the processing chamber 1, the reduced opening is provided with a switch valve 61, and the bottom plate 52 of the adsorption system, the funnel-shaped placing plate 131 and the side wall of the processing chamber 1 form a desorption chamber 13; a plurality of vent holes are formed in the inclined side plate, and the inner diameter of each vent hole is smaller than the outer diameter of the activated carbon; the ozone generator 51 is arranged outside the treatment chamber 1; one end of the ozone vent pipe 52 is communicated with the air outlet of the ozone generator 51, and the other end is communicated with the desorption chamber 13 through the side wall of the treatment chamber 1;
the circulating system is arranged in the processing chamber 1 and comprises a communicating pipe 62 and an air pump 63, and a top plate 121 of the adsorption system, the top wall of the processing chamber 1 and the side wall of the processing chamber 1 form a circulating chamber 11; one end of the communicating pipe 62 is connected with the switch valve 61 of the desorption system, and the other end is communicated with the circulating chamber 11 through the air pump 63;
the catalytic system is arranged in the processing chamber 1 and is positioned below the desorption chamber 13, and a funnel-shaped placing plate 131 of the desorption system, the side wall of the processing chamber 1 and the bottom wall of the processing chamber 1 form a catalytic chamber 14; an ultraviolet lamp post 71, a heating lamp tube 73, a catalyst and catalyst placing plate 72 are arranged in the catalysis chamber 14; the catalyst is TiO2The ultraviolet lamp post 71 is fixed on the bottom wall of the processing chamber 1; the catalyst placing plate 72 is a spiral plate surrounding the ultraviolet lamp post 71, the inner side of the catalyst placing plate 72 is connected with the ultraviolet lamp post 71 in an abutting mode, the outer side of the catalyst placing plate 72 is connected with the side wall of the treatment chamber 1 in an abutting mode, and a catalyst is placed on the catalyst placing plate 72; the heating lamp tubes 73 are arranged on the side wall of the treatment chamber 1 and at the connection intervals with the outer side of the catalyst placing plate 72, and the heating lamp tubes 73 and the ultraviolet lamp posts 71 are made of quartz glass, so that organic matters can be effectively prevented from being adhered; a water outlet 141 is formed in the bottom wall of the treatment chamber 1 corresponding to the bottom of the spiral plate;
the oxidation system is arranged outside the treatment chamber 1 and comprises a carbon dioxide absorption chamber 81 and an ozone degradation chamber 82, the air inlet of the carbon dioxide absorption chamber 81 is communicated with the catalysis chamber 14 corresponding to the bottom of the spiral plate 72, the air outlet of the carbon dioxide absorption chamber 81 is communicated with the air inlet of the ozone degradation chamber 82, and the air outlet of the ozone degradation chamber 82 is communicated with the atmosphere.
Further, the gas filter further comprises an ear chamber 4, the ear chamber 4 is arranged between the gas outlet of the gas filter 22 and one side of the adsorption chamber 12, one side of the ear chamber 4 is communicated with the gas outlet, the other side of the ear chamber is communicated with the adsorption chamber 12, and the top wall and the bottom wall of the ear chamber 4 are respectively flush with the top plate 121 and the bottom plate 122; the ear chamber 4 is provided with a nonuniform porous plate 41 corresponding to the adsorption chamber 12, the nonuniform porous plate 41 having a gradually increasing aperture in a direction from the center toward the outer periphery.
Further, the uneven porous plate 41 is disposed corresponding to the shape of the side wall of the processing chamber 12, and the periphery thereof is connected to the top wall, the bottom wall and the side wall of the ear chamber.
Further, the uneven porous plate 41 is provided with small holes 411, medium holes 412 and large holes 413 in the direction from the center to the outer periphery.
Further, the aperture ratio of the uneven porous plate 41 was 38.8%, the aperture of the large hole 413 was 50mm, the aperture of the medium hole 412 was 30mm, and the aperture of the small hole 411 was 15 mm.
Further, roof 121 and bottom plate 122 are along a plurality of platelet concatenation shaping of center partition setting, the lateral wall of the articulated processing chamber in lateral wall one side of the corresponding processing chamber of platelet 1, cylinder 123 stiff end and the lateral wall fixed connection of processing chamber 1, the expansion end is articulated bottom the platelet.
Further, the bottom plate 122 and the top plate 121 have an equal amount of activated carbon placed thereon.
Further, the system also comprises a control system, wherein the control system comprises a first photoelectric sensor 92, a second photoelectric sensor 93, a concentration sensor 91 and a PLC 94; the first photoelectric sensor 92 and the concentration sensor 91 are arranged at the bottom of the adsorption chamber 12 and are respectively and fixedly connected to the side wall of the processing chamber 1; the second photoelectric sensor 93 is arranged at the bottom of the circulating chamber and is fixedly connected to the side wall of the processing chamber 1; the PLC94 is electrically connected to the first photoelectric sensor 92, the second photoelectric sensor 93, the concentration sensor 91, the cylinder 123, the first air valve 23, the second air valve 33, the VOC concentration detector 31, the air pump 63, the switch valve 61, the ozone generator 51, and the air filter 22, respectively.
A control method of a photocatalytic oxidation exhaust gas treatment device, which applies the photocatalytic oxidation exhaust gas treatment device, comprises the following steps:
s1 and PLC94 control a first air valve 23 and a gas filter 22 of the air inlet pipe 21 to be opened, VOC gas enters the ear room 4 after being filtered by the gas filter 22, and the filtered VOC gas enters the adsorption chamber 12 through the uneven porous plate 41;
s2, detecting the concentration of the filtered VOC gas in the adsorption cavity 12 by the concentration sensor 91, and when the concentration of the filtered VOC gas reaches an activated carbon adsorption saturation value, transmitting a signal to a PLC94 by the concentration sensor 91, and controlling the first air valve 23 and the gas filter 22 of the air inlet pipe to be closed by the PLC 94;
s3, adsorbing the filtered VOC gas by using activated carbon, detecting the content of the filtered VOC gas in the adsorption chamber by using the VOC concentration detector 31, transmitting a signal to the PLC94 when the content is lower than a dischargeable standard, and controlling the second air valve 33 of the air outlet pipe 32 to be opened by the PLC94 so as to discharge the purified gas; meanwhile, the PLC94 controls the cylinder 123 connected with the bottom plate 122 to contract, and the activated carbon falls on the funnel-shaped placing plate 131 in the desorption chamber 13;
s4, after all the activated carbon on the bottom plate 122 falls down, the first photoelectric sensor 92 transmits signals to the PLC94, the PLC94 controls the cylinder 123 connected with the bottom plate 122 to extend out, then controls the air valve II 33 of the air outlet pipe 32 to close, and then controls the cylinder 123 connected with the top plate 121 to contract, so that the activated carbon on the top plate 121 falls down onto the bottom plate 122, when all the activated carbon on the top plate 121 falls down, the second photoelectric sensor 93 transmits signals to the PLC94, and the PLC94 controls the cylinder 123 connected with the top plate 232 to extend out;
s5, the PLC94 controls the ozone generator 51 to be started, ozone is conveyed to the desorption chamber 13 through the ozone vent pipe 52, filtered VOC gas in the activated carbon is desorbed, and the desorbed gas sinks into the catalytic chamber 14 through vent holes in the funnel-shaped placing plate 131;
s6, making the desorbed gas sinking into the catalytic chamber 14 pass through the catalyst placing plate 72 with catalyst, and oxidizing the desorbed gas into CO under the illumination of the ultraviolet lamp post 71 and the heating lamp tube 732And H2O，CO2And the remaining ozone is absorbed by the carbon dioxide absorption chamber 81 and degraded by the ozone degradation chamber 82, H2O is discharged from the lower water outlet 141, and the PLC94 controls to open the switching valve 61 and the air pump 63 to transfer the activated carbon on the funnel-shaped placing plate 131 to the top plate 121 of the circulation chamber 11.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. A photocatalytic oxidation exhaust gas treatment apparatus characterized in that: it includes:
a processing chamber;
the adsorption system is arranged in the treatment chamber and comprises a top plate, a bottom plate, a cylinder and activated carbon, wherein the top plate and the bottom plate are respectively abutted and connected with the side wall of the treatment chamber to form an adsorption chamber; the top plate and the bottom plate are respectively hinged on the side wall of the treatment chamber, activated carbon is placed on the top plate and the bottom plate, the air cylinders are respectively arranged at the bottoms of the top plate and the bottom plate, the fixed ends of the air cylinders are fixedly connected with the side wall of the treatment chamber, and the movable ends are respectively hinged with the bottoms of the top plate and the bottom plate;
the gas inlet system is arranged outside the treatment cavity and comprises a gas inlet pipe and a gas filter, wherein a first gas valve is arranged on the gas inlet pipe, the gas inlet pipe is communicated with a gas inlet of the gas filter, and a gas outlet of the gas filter is communicated with one side of the adsorption cavity;
the gas outlet system is arranged outside the treatment cavity and comprises a gas outlet pipe and a VOC concentration detector, wherein a gas inlet of the VOC concentration detector is communicated with the other side of the adsorption cavity, a gas outlet of the VOC concentration detector is communicated with the gas outlet pipe, and a gas valve II is arranged on the gas outlet pipe;
the desorption system is arranged in the treatment chamber, is positioned below the adsorption chamber and comprises a funnel-shaped placing plate, an ozone vent pipe and an ozone generator; the funnel-shaped placing plate comprises an expanding opening, a reducing opening and an inclined side plate, the expanding opening corresponds to the bottom plate of the adsorption system, the edge of the expanding opening is fixedly connected with the side wall of the treatment chamber, a switch valve is arranged at the reducing opening, and the bottom plate of the adsorption system, the funnel-shaped placing plate and the side wall of the treatment chamber form a desorption chamber; a plurality of vent holes are formed in the inclined side plate, and the inner diameter of each vent hole is smaller than the outer diameter of the activated carbon; the ozone generator is arranged outside the treatment cavity; one end of the ozone vent pipe is communicated with the air outlet of the ozone generator, and the other end of the ozone vent pipe is communicated with the desorption chamber through the side wall of the treatment chamber;
the circulating system is arranged in the processing chamber and comprises a communicating pipe and an air pump, and a top plate of the adsorption system, a top wall of the processing chamber and a side wall of the processing chamber form a circulating chamber; active carbon is placed on the top plate; one end of the communicating pipe is connected with a switch valve of the desorption system, and the other end of the communicating pipe is communicated with the circulating chamber through an air pump;
the catalytic system is arranged in the treatment chamber and is positioned below the desorption chamber, and a funnel-shaped placing plate of the desorption system, the side wall of the treatment chamber and the bottom wall of the treatment chamber form a catalytic chamber; an ultraviolet lamp post, a heating lamp tube, a catalyst and a catalyst placing plate are arranged in the catalysis chamber; the ultraviolet lamp post is fixed on the bottom wall of the processing chamber; the catalyst placing plate is a spiral plate surrounding the ultraviolet lamp post, the inner side of the catalyst placing plate is connected with the ultraviolet lamp post in an abutting mode, the outer side of the catalyst placing plate is connected with the side wall of the processing cavity in an abutting mode, and a catalyst is placed on the catalyst placing plate; a plurality of heating lamp tubes are arranged on the side wall of the treatment chamber at intervals with the connection of the outer side of the catalyst placing plate, and a water outlet is formed in the bottom wall of the treatment chamber corresponding to the bottom of the spiral plate;
the oxidation system is arranged outside the treatment cavity and comprises a carbon dioxide absorption chamber and an ozone degradation chamber, wherein the air inlet of the carbon dioxide absorption chamber corresponds to the bottom of the spiral plate and is communicated with the catalysis cavity, the air outlet of the carbon dioxide absorption chamber is communicated with the air inlet of the ozone degradation chamber, and the air outlet of the ozone degradation chamber is communicated with the atmosphere.
2. A photocatalytic oxidation exhaust gas treatment device according to claim 1, characterized in that: the ear chamber is arranged between the gas outlet of the gas filter and one side of the adsorption chamber, one side of the ear chamber is communicated with the gas outlet, the other side of the ear chamber is communicated with the adsorption chamber, and the top wall and the bottom wall of the ear chamber are respectively flush with the top plate and the bottom plate; the earmuffs are provided with uneven porous plates corresponding to the adsorption chambers, and the aperture of the uneven porous plates is gradually increased along the direction from the center to the periphery.
3. A photocatalytic oxidation exhaust gas treatment device according to claim 2, characterized in that: the uneven porous plate is arranged corresponding to the shape of the side wall of the processing chamber, and the periphery of the uneven porous plate is connected with the top wall, the bottom wall and the side wall of the ear chamber.
4. A photocatalytic oxidation exhaust gas treatment device according to claim 2, characterized in that: the uneven porous plate is provided with small holes, medium holes and large holes along the direction from the center to the periphery.
5. A photocatalytic oxidation exhaust gas treatment device according to claim 1, characterized in that: the aperture ratio of the uneven porous plate is 38.8%, the aperture of a large hole is 50mm, the aperture of a medium hole is 30mm, and the aperture of a small hole is 15 mm.
6. A photocatalytic oxidation exhaust gas treatment device according to claim 1, characterized in that: the roof and bottom plate are along a plurality of platelet concatenation shaping of center partition setting, the lateral wall of lateral wall one side articulated processing chamber of processing chamber is corresponded to the platelet, the lateral wall fixed connection of cylinder stiff end and processing chamber, the expansion end is articulated bottom the platelet.
7. A photocatalytic oxidation exhaust gas treatment device according to claim 1, characterized in that: the quantity of the activated carbon placed on the bottom plate is equal to that of the activated carbon placed on the top plate.
8. A photocatalytic oxidation exhaust gas treatment device according to claim 1, characterized in that: the catalyst is TiO2。
9. A photocatalytic oxidation exhaust gas treatment device according to claim 2, characterized in that: the system also comprises a control system, wherein the control system comprises a first photoelectric sensor, a second photoelectric sensor, a concentration sensor and a PLC; the first photoelectric sensor and the concentration sensor are arranged at the bottom of the adsorption chamber and are respectively and fixedly connected to the side wall of the treatment chamber; the photoelectric sensor II is arranged at the bottom of the circulating chamber and is fixedly connected to the side wall of the processing chamber; the PLC is respectively and electrically connected with the first photoelectric sensor, the second photoelectric sensor, the concentration sensor, the cylinder, the first air valve, the second air valve, the VOC concentration detector, the air pump, the switch valve, the ozone generator and the air filter.
10. A control method of a photocatalytic oxidation exhaust gas treatment apparatus to which the photocatalytic oxidation exhaust gas treatment apparatus of claim 9 is applied, characterized in that: which comprises the following steps:
s1, opening a first air valve of an air inlet pipe and a gas filter by PLC control, filtering the VOC gas by the gas filter and then entering an ear room, and entering the filtered VOC gas into an adsorption chamber through a non-uniform porous plate;
s2, detecting the concentration of the filtered VOC gas in the adsorption cavity by a concentration sensor, and when the concentration of the filtered VOC gas reaches an activated carbon adsorption saturation value, transmitting a signal to a PLC (programmable logic controller), wherein the PLC controls a gas valve I of a gas inlet pipe and a gas filter to be closed;
s3, adsorbing the filtered VOC gas by using activated carbon, detecting the content of the filtered VOC gas in the adsorption chamber by using a VOC concentration detector, and when the content is lower than a dischargeable standard, transmitting a signal to a PLC (programmable logic controller), wherein the PLC controls a second air valve of an air outlet pipe to be opened to discharge the purified gas; meanwhile, the PLC controls the cylinder connected with the bottom plate to contract, and the activated carbon falls onto the funnel-shaped placing plate in the desorption chamber;
s4, after all the activated carbon on the bottom plate falls, the first photoelectric sensor transmits signals to the PLC, the PLC controls the cylinder connected with the bottom plate to extend, then controls the second air valve of the air outlet pipe to close, and controls the cylinder connected with the top plate to contract, so that the activated carbon on the top plate falls onto the bottom plate, when all the activated carbon on the top plate falls, the second photoelectric sensor transmits signals to the PLC, and the PLC controls the cylinder connected with the top plate to extend;
s5, the PLC controls the ozone generator to be started, ozone is conveyed to the desorption chamber through the ozone vent pipe, filtered VOC gas in the activated carbon is desorbed, and the desorbed gas sinks into the catalysis chamber through the vent holes in the funnel-shaped placing plate;
s6, making the desorbed gas sink into the catalytic chamber pass through a catalyst placing plate with a catalyst, and oxidizing the desorbed gas into CO under the illumination of an ultraviolet lamp post and a heating lamp tube2And H2O，CO2And the residual ozone is absorbed by the carbon dioxide absorption chamber and degraded by the ozone degradation chamber, H2And O is discharged from a water outlet below, and the PLC controls to open the switch valve and the air pump so as to convey the activated carbon on the funnel-shaped placing plate to a top plate of the circulating chamber.
CN202210473719.1A 2022-04-29 2022-04-29 Photocatalytic oxidation waste gas treatment equipment and control method thereof Active CN114699913B (en)

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