A micro ultraviolet waste gas treatment device

Abstract

A kind of micro ultraviolet waste gas treatment device, it is characterized in that, including waste gas pipeline and the expansion guide groove connected with it, expansion guide groove outlet end is connected with processing and exhaust frame, processing and exhaust frame inlet end is divided into multiple spaces by partition, one waste gas treatment device is arranged in each space, the outlet end of waste gas treatment device is connected by aggregation exhaust pipe and is combined into multiple groups, recovery pipeline is arranged on each aggregation exhaust pipe, recovery pipeline is aggregated into recovery main pipe in waste gas pipeline intake end and is connected with waste gas pipeline.By expanding and guiding the waste gas of pipeline, the waste gas is guided to multiple independent processing spaces, and under the triple action of microwave superhigh frequency electromagnetic field pre-splitting of waste gas treatment device, bUVC ray bond breaking photolysis and hydroxyl oxidation group, organic matter is fully degraded, and degradation power can be preset to adjust according to pipeline flow, and degradation process can also be recycled and degraded again according to degradation quality, to achieve the purpose of full degradation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste gas treatment equipment, in particular to a micro-ultraviolet waste gas treatment device. BACKGROUND

[0002] VOCS waste gas and organic odor gas are key components of air pollution. At present, the main means of purifying organic waste gas is still RTO and RCO incineration method, but the incineration method has two shortcomings: 1. Consuming natural gas. 2. Insufficient temperature will produce a large amount of dioxin.

[0003] Using micro-ultraviolet light catalyst to degrade VOC waste gas and organic odor gas has high efficiency, long service life, no ozone generation, no consumption of natural gas, stable equipment operation, long service life and low maintenance cost, and is a relatively environmentally friendly and clean waste gas treatment technology. However, compared with incineration method, micro-ultraviolet degradation requires waste gas to fully combine with substances generated by ultraviolet excitation catalyst, and the efficiency is low at the corner position of the device because a good catalytic contact reaction cannot be generated. Moreover, the existing degradation method cannot adjust the degradation process and control the process according to the waste gas treatment result. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a micro-ultraviolet waste gas treatment device capable of fully degrading industrial VOCs waste gas and controlling the process and quality.

[0005] To solve the above technical problems, the technical solution adopted by the present application is:

[0006] A micro-ultraviolet waste gas treatment device, comprising a waste gas pipeline and an expansion guide groove connected thereto, an outlet end of the expansion guide groove and a treatment and exhaust frame, an inlet end of the treatment and exhaust frame is separated into multiple spaces by a partition plate, one waste gas treatment device is arranged in each space, the outlet ends of the waste gas treatment devices are connected to form multiple groups through polymerization exhaust pipes, a recovery pipeline is arranged on each polymerization exhaust pipe, the recovery pipelines are polymerized into a recovery main pipe at the inlet end of the waste gas pipeline and connected to the waste gas pipeline, a recovery air extractor is arranged on the recovery main pipe, a waste gas flow sensor is arranged on the waste gas pipeline, a recovery pipeline valve is arranged on each recovery pipeline, an exhaust quality sensor is arranged at the exhaust outlet end of the polymerization exhaust pipe, the waste gas treatment device degrades the waste gas by generating ultraviolet light and acting on the photocatalyst, and the degradation power of the waste gas treatment device is controlled and adjusted.

[0007] The treatment and exhaust frame is separated into an input end and an output end by a support plate, the waste gas treatment device is arranged at the input end and fixedly connected to the support plate, and the exhaust end of the waste gas treatment device extends out of the support plate into the output end and connected to the polymerization exhaust pipe.

[0008] The expansion guide groove is divided into two ends by the expansion partition plate, and the position of the expansion partition plate at the output end of the expansion guide groove corresponds to the position of the partition plate of the treatment and exhaust frame.

[0009] The exhaust gas flow sensor and the exhaust gas mass sensor are electrically connected to the input end of the exhaust gas treatment controller, and the output end of the exhaust gas treatment controller is electrically connected to the exhaust gas treatment device, the recovery pipeline valve and the recovery air extractor.

[0010] The exhaust gas treatment controller is communicatively connected to the analog module, the exhaust gas flow sensor and the exhaust gas mass sensor are electrically connected to the input end of the analog module, and the output end of the analog module is electrically connected to the exhaust gas treatment device.

[0011] The exhaust gas treatment device includes an exhaust gas treatment frame, a microwave generating device is fixed on the exhaust gas treatment frame, the exhaust gas treatment frame is a frame with an internal passage, an air inlet filter plate and an air outlet plate are arranged at two ends of the exhaust gas treatment frame, a photocatalyst plate is arranged in the middle of the exhaust gas treatment frame, and ultraviolet lamp tubes electrically connected to the microwave generating device are arranged on both sides of the photocatalyst plate.

[0012] The polymeric exhaust pipe shares one microwave generating device with the exhaust gas treatment devices of the corresponding group, and the output end of the analog module is electrically connected to the microwave generating device.

[0013] The partition plate is composed of vertical and horizontal straight plates, which divide the input end of the treatment and exhaust frame into multiple cuboid spaces, and the exhaust gas treatment devices in the cuboid spaces of the same horizontal line form a group connected to the polymeric exhaust pipe.

[0014] The exhaust gas treatment controller is electrically connected and controlled through the control relay to the recovery pipeline valve and the recovery air extractor.

[0015] The exhaust gas treatment controller is communicatively connected to the display screen.

[0016] The exhaust gas treatment method using the above-mentioned micro-ultraviolet exhaust gas treatment device includes the following steps:

[0017] Step 1: VOCs exhaust gas enters the exhaust gas pipeline and passes through the expansion guide groove to reach the intake end of the treatment and exhaust frame, and the exhaust gas flow sensor senses the current exhaust gas flow;

[0018] Step 2: The exhaust gas treatment controller calculates the initial degradation power according to the flow transmitted by the exhaust gas flow sensor, and generates a control analog voltage / current to each microwave generating device;

[0019] Step three, the microwave generating device receives the control analog voltage / current, generates a microwave super high frequency electromagnetic field in the exhaust gas treatment frame, and generates bUVC rays from the ultraviolet lamp tube, the wavelength of the bUVC rays is nm, and the ultraviolet lamp tube adopts a mercury amalgam driven ultraviolet sterilization lamp;

[0020] Step four, the microwave super high frequency electromagnetic field pre-splits the exhaust gas VOCs molecules in the space separated by the partition plate and the support plate into small molecules;

[0021] Step five, the bUVC rays break the bond photolysis of the small molecule VOCs gas;

[0022] Step six, at the same time as steps four and five, the bUVC rays irradiate the TiO2 nano coating on the photocatalyst plate to catalytically generate hydroxyl oxidation groups -OH, and the hydroxyl oxidation groups -OH further break the bond of the exhaust gas to convert the VOCs gas into harmless water and CO2;

[0023] Step seven, the exhaust quality sensor at the polymer exhaust pipe detects the exhaust quality of each group and sends the detection result to the exhaust gas treatment controller, the exhaust gas treatment controller compares the detection result with the set value to determine whether the exhaust quality meets the standard, if all meet the standard, the exhaust gas treatment is completed, if the exhaust quality of a group does not meet the standard, step eight is entered; Step eight, the exhaust gas treatment controller controls the opening of the recovery pipeline valve of the group with non-standard exhaust quality, starts the recovery air extractor, recovers the exhaust gas in the polymer exhaust pipe of the non-standard group to the exhaust pipeline, and the exhaust gas treatment controller calculates the secondary degradation power data of each group according to the non-standard exhaust quality and generates control analog voltage / current to each microwave generating device, and repeats steps three to seven until all groups meet the standard, stops the recovery air extractor, and closes the recovery pipeline valve.

[0024] The micro-ultraviolet exhaust gas treatment device provided by the application can expand and guide the exhaust gas in the pipeline, guide the exhaust gas to multiple independent treatment spaces, and make the organic matter be fully degraded under the triple action of the microwave super high frequency electromagnetic field, the bond breaking photolysis of the bUVC rays and the hydroxyl oxidation group of the exhaust gas treatment device, and the degradation power can be preset and adjusted according to the pipeline flow, and the degradation process can be recycled and degraded again according to the degradation quality, so that the purpose of full degradation is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0025] The application will be further described below in combination with the drawings and examples:

[0026] Figure 1 It is a structural schematic view of the micro-ultraviolet exhaust gas treatment device of the application;

[0027] Figure 2 It is a front view of the structure of the treatment and exhaust frame of the application;

[0028] Figure 3 for Figure 2 sectional view of B-B;

[0029] Figure 4 for the structure of the invention processing and exhaust frame rear view;

[0030] Figure 5 for the structure of the invention expansion guide slot Figure 1 ;

[0031] Figure 6 for the structure of the invention expansion guide slot Figure 2 ;

[0032] Figure 7 for the structure of the exhaust pipe schematic diagram;

[0033] Figure 8 for the structure of the exhaust treatment device schematic diagram;

[0034] Figure 9 for the sectional view of the exhaust treatment device;

[0035] Figure 10 for the electrical schematic diagram of the invention.

[0036] Wherein: processing and exhaust frame 1, expansion guide slot 2, expansion baffle 21, exhaust pipe 3, polymer exhaust pipe 4, recovery pipeline 5, recovery pipeline valve 6, exhaust flow sensor 7, recovery main pipe 8, recovery air extractor 9, exhaust mass sensor 10, support plate 11, exhaust treatment device 12, exhaust treatment frame body 121, microwave generating device 122, air inlet filter plate 123, air outlet plate 124, photocatalyst plate 125, ultraviolet lamp 126, baffle 13, exhaust treatment controller 14, display screen 15, analog module 16, control relay 17. DETAILED DESCRIPTION

[0037] The technical scheme of the invention is described in detail below in combination with the drawings and examples.

[0038] As Figures 1-10As shown in the figure, a micro ultraviolet waste gas treatment device includes a waste gas pipeline 3 and an expansion guide groove 2 connected therewith, an outlet end of the expansion guide groove 2 is connected with a treatment and exhaust frame 1, an inlet end of the treatment and exhaust frame 1 is separated into multiple spaces by a partition plate 13, one waste gas treatment device 12 is arranged in each space, outlet ends of the waste gas treatment devices 12 are connected to form multiple groups through aggregation of exhaust pipes 4, a recovery pipeline 5 is arranged on each exhaust pipe 4, the recovery pipelines 5 are aggregated into a recovery main pipe 8 at an inlet end of the waste gas pipeline 3 and are connected with the waste gas pipeline 3, a recovery air extractor 9 is arranged on the recovery main pipe 8, a waste gas flow sensor 7 is arranged on the waste gas pipeline 3, a recovery pipeline valve 6 is arranged on each recovery pipeline 5, an exhaust quality sensor 10 is arranged at an exhaust outlet end of the exhaust pipe 4, the waste gas treatment device 12 degrades the waste gas through ultraviolet light and photocatalyst, and the degradation power of the waste gas treatment device 12 is controlled and adjusted.

[0039] The VOCs waste gas at the waste gas pipeline 3 is guided to the treatment and exhaust frame 1 through the expansion guide groove 2, enters the independent spaces separated by the partition plate 13, and reacts with TiO2 on the photocatalyst through the ultraviolet light generated by the waste gas treatment device 12 in each independent space to generate hydroxyl oxidation group -OH, breaks the organic matter in the waste gas, and then discharges harmless water and CO2.

[0040] The waste gas in the waste gas pipeline 3 is degraded by the waste gas treatment device 12 after volume expansion, and multiple waste gas treatment devices 12 can improve the degradation efficiency. Compared with the overall degradation device, the degradation quality will not be low due to the fact that the waste gas in the pipeline does not react in some parts of the device, and the degradation power of the waste gas treatment device 12 can be adjusted by detecting the flow of the waste gas, so as to reasonably match, prevent waste of power consumption due to excessive reaction of the device, and incomplete degradation due to insufficient catalytic reaction.

[0041] The exhaust quality sensor 10 arranged at the exhaust pipe 4 can detect the degraded organic matter to judge the degradation quality, when the degradation is not up to standard, the recovery air extractor 9 is started, the corresponding recovery pipeline valve 6 is opened, the off-standard treated gas is recovered for reprocessing, and the degradation power of the waste gas treatment device 12 corresponding to the off-standard group is increased to improve the degradation efficiency.

[0042] The treatment and exhaust frame 1 is separated into an input end and an output end by a support plate 11, the waste gas treatment device 12 is arranged at the input end and is fixedly connected with the support plate 11, an exhaust end of the waste gas treatment device 12 extends out of the support plate 11 into the output end and is connected with the exhaust pipe 4.

[0043] The support plate 11 plays a role of mounting and supporting the waste gas treatment device 12 and separates the treatment and exhaust frame 1 into multiple independent spaces together with the partition plate 13 and the inner wall of the treatment and exhaust frame 1, and each space can degrade and treat the waste gas.

[0044] The expansion guide groove 2 is divided into two ends by the expansion partition plate 21, and the position of the expansion partition plate 21 at the output end of the expansion guide groove 2 corresponds to the position of the partition plate 13 of the treatment and exhaust frame 1.

[0045] The exhaust gas pipeline 3 inputs the exhaust gas into the expansion guide groove 2 through the expansion partition plate 21, and enters the multiple independent spaces divided by the partition plate 13, and is degraded by the exhaust gas treatment device 12 in the space, which can effectively increase the reaction area of the exhaust gas and improve the catalytic reaction efficiency.

[0046] The exhaust gas flow sensor 7 and the exhaust gas quality sensor 10 are electrically connected to the input end of the exhaust gas treatment controller 14, and the output end of the exhaust gas treatment controller 14 is electrically connected to the exhaust gas treatment device 12, the recovery pipeline valve 6 and the recovery air extractor 9.

[0047] The exhaust gas treatment controller 14 controls the exhaust gas treatment device 12 to generate corresponding degradation power in advance according to the exhaust gas flow data transmitted by the exhaust gas flow sensor 7, and then detects the degradation quality according to the exhaust gas quality sensor 10 at the polymerization exhaust pipeline 4. When the degradation quality at a certain polymerization exhaust pipeline 4 does not meet the standard, the recovery air extractor 9 is started and the corresponding recovery pipeline valve 6 is opened to recover and degrade the exhaust gas again, and the degradation power data should be increased according to the degradation quality data and the exhaust gas treatment device 12 is controlled to increase to the specified power.

[0048] The exhaust gas treatment controller 14 is communicatively connected to the analog module 16, the exhaust gas flow sensor 7 and the exhaust gas quality sensor 10 are electrically connected to the input end of the analog module 16, and the output end of the analog module 16 is electrically connected to the exhaust gas treatment device 12.

[0049] The transmitters of the exhaust gas flow sensor 7 and the exhaust gas quality sensor 10 convert the flow and organic matter data into corresponding analog voltage or current into the analog module 16, the analog module 16 converts the analog quantity into corresponding digital quantity value to calculate the current flow and organic matter value and transmits it to the exhaust gas treatment controller 14, the exhaust gas treatment controller 14 calculates the required degradation power value and adjusts the power value and sends it to the analog module 16, and the analog module 16 converts it into control analog voltage or current and sends it to the exhaust gas treatment device 12.

[0050] The exhaust gas treatment device 12 includes an exhaust gas treatment frame 121, a microwave generating device 122 fixed on the exhaust gas treatment frame 121, the exhaust gas treatment frame 121 is a frame with an internal through hole, the exhaust gas treatment frame 121 is provided with an air inlet filter plate 123 and an air outlet plate 124 at both ends, and a photocatalyst plate 125 is arranged in the middle of the exhaust gas treatment frame 121. The photocatalyst plate 125 is provided with an ultraviolet lamp 126 electrically connected to the microwave generating device 122 on both sides.

[0051] The VOCs exhaust gas is filtered by the gas inlet filter plate 123, and then enters the exhaust gas treatment frame 121. The microwave generating device 122 controls the ultraviolet lamp 126 to generate bUVC rays with a wavelength of 253.7 nm, and generates a microwave super high frequency electromagnetic field. The microwave super high frequency electromagnetic field pre-splits the VOCs molecules, cuts them into small molecules, and then the bUVC rays break the bonds of the small molecule VOCs gas, and the bUVC rays irradiate the TiO2 nano coating on the photocatalyst plate 125 to generate hydroxyl oxidation group -OH. The bond dissociation energy (BDE) of the hydroxyl oxidation group -OH is 13 times that of ozone (O3), so the photocatalytic efficiency is higher, and the bond breaking is more complete, converting the VOCs gas into harmless water and CO2.

[0052] The above-mentioned polymeric exhaust pipe 4 corresponds to a group of exhaust gas treatment devices 12, and a microwave generating device 122 is shared by the group. The output end of the analog module 16 is electrically connected to the microwave generating device 122.

[0053] The exhaust gas treatment devices 12 connected by the polymeric exhaust pipe 4 of the same group form a control whole, and the exhaust gas quality sensor 10 is used to determine whether to increase the degradation power of the exhaust gas treatment device 12 of the group.

[0054] The above-mentioned partition plate 13 is composed of vertical and horizontal straight plates, which divides the input end of the treatment and exhaust frame 1 into multiple cuboid spaces. The exhaust gas treatment devices 12 in the cuboid spaces of the same horizontal line form a group connected with the polymeric exhaust pipe 4.

[0055] The input end of the treatment and exhaust frame 1 is divided into substantially identical cuboid spaces, and the exhaust gas in each space is degraded by the exhaust gas treatment device 12. The exhaust gas in the pipeline is guided to the independent space for treatment, avoiding the reduction of treatment efficiency caused by the difficulty of the whole treatment to contact the corners.

[0056] The above-mentioned exhaust gas treatment controller 14 is electrically connected and controlled with the recovery pipeline valve 6 and the recovery air extractor 9 through the control relay 17.

[0057] The above-mentioned exhaust gas treatment controller 14 is communicatively connected with the display screen 15.

[0058] The display screen 15 is a touch screen, which can be used for parameter setting and degradation process display.

[0059] The above-mentioned exhaust gas treatment method using a micro ultraviolet exhaust gas treatment device has the following steps:

[0060] Step one, the VOCs exhaust gas enters the exhaust gas pipeline 3 and passes through the expansion guide groove 2 to reach the intake end of the treatment and exhaust frame 1, and the exhaust gas flow sensor 7 senses the current exhaust gas flow;

[0061] Step two, the exhaust gas treatment controller 14 calculates the primary degradation power according to the flow rate transmitted by the exhaust gas flow rate sensor 7, and generates control analog voltage / current to each microwave generating device 122;

[0062] Step three, the microwave generating device 122 receives the control analog voltage / current, generates microwave super high frequency electromagnetic field in the exhaust gas treatment frame 121, and generates bUVC rays with wavelength of 253.7 nm by the ultraviolet lamp 126 which is a mercury amalgam driven ultraviolet sterilization lamp;

[0063] Step four, the microwave super high frequency electromagnetic field pre-splits the VOCs molecules in the space separated by the partition plate 13 and the support plate 11 into small molecules;

[0064] Step five, the bUVC rays break the bonds of the small molecule VOCs gas;

[0065] Step six, at the same time of step four and step five, the bUVC rays irradiate the TiO2 nano-coating on the photocatalyst plate 125 to catalytically generate hydroxyl oxidation group -OH, which further breaks the bonds of the exhaust gas to convert the VOCs gas into harmless water and CO2;

[0066] Step seven, the exhaust gas quality sensor 10 at the polymer exhaust pipe 4 detects the quality of each group of exhaust gas and sends the detection results to the exhaust gas treatment controller 14, which compares the detection results with the set value to determine whether the exhaust gas quality meets the standard. If all groups meet the standard, the exhaust gas treatment is completed. If the exhaust gas quality of a group does not meet the standard, go to step eight;

[0067] Step eight, the exhaust gas treatment controller 14 controls the recovery pipeline valve 6 of the group with exhaust gas quality not meeting the standard to open, starts the recovery air extractor 9, and recovers the exhaust gas in the polymer exhaust pipe 4 of the group with exhaust gas quality not meeting the standard to the exhaust gas pipeline 3. The exhaust gas treatment controller 14 recalculates the secondary degradation power data of each group according to the exhaust gas quality data not meeting the standard, and generates control analog voltage / current to each microwave generating device 122. Repeat steps three to seven until the exhaust gas quality of all groups meets the standard, stop the recovery air extractor 9, and close the recovery pipeline valve 6.

Claims

1. A micro-UV waste gas treatment device, characterized in that, The application relates to a waste gas treatment device, which comprises a waste gas pipeline (3) and an expansion guide groove (2) connected with the waste gas pipeline (3), the outlet end of the expansion guide groove (2) is connected with a treatment and exhaust frame (1), the inlet end of the treatment and exhaust frame (1) is divided into multiple spaces by a partition plate (13), one waste gas treatment device (12) is arranged in each space, the outlet ends of the waste gas treatment devices (12) are connected to form multiple groups through a combined exhaust pipeline (4), a recovery pipeline (5) is arranged on each combined exhaust pipeline (4), the recovery pipelines (5) are combined into a recovery main pipeline (8) at the inlet end of the waste gas pipeline (3) and are connected with the waste gas pipeline (3), a recovery air extractor (9) is arranged on the recovery main pipeline (8), a waste gas flow sensor (7) is arranged on the waste gas pipeline (3), a recovery pipeline valve (6) is arranged on each recovery pipeline (5), an exhaust quality sensor (10) is arranged at the exhaust outlet end of the combined exhaust pipeline (4), the waste gas treatment device (12) degrades the waste gas through the ultraviolet ray and the photocatalyst, and the degradation power of the waste gas treatment device (12) is controlled and adjusted. The expansion guide groove (2) is divided into two ends by an expansion partition plate (21), and the position of the expansion partition plate (21) at the outlet end of the expansion guide groove (2) corresponds to the position of the partition plate (13) of the treatment and exhaust frame (1). The waste gas treatment device (12) comprises a waste gas treatment frame body (121), a microwave generating device (122) is fixed on the waste gas treatment frame body (121), the waste gas treatment frame body (121) is a frame body penetrating through the inside, air inlet filter plates (123) and air outlet plates (124) are arranged at the two ends of the waste gas treatment frame body (121), a photocatalyst plate (125) is arranged at the middle of the waste gas treatment frame body (121), and ultraviolet lamp tubes (126) electrically connected with the microwave generating device (122) are arranged at the two sides of the photocatalyst plate (125). The partition plate (13) is composed of vertical and horizontal straight plate materials, divides the input end of the treatment and exhaust frame (1) into multiple cuboid spaces, and the waste gas treatment devices (12) in the cuboid spaces of the same horizontal line form a group and are connected with the combined exhaust pipeline (4).

2. A micro-UV waste gas treatment device according to claim 1, characterized in that, The treatment and exhaust frame (1) is divided into an input end and an output end by a support plate (11), the waste gas treatment devices (12) are arranged at the input end and are fixedly connected with the support plate (11), the exhaust end of the waste gas treatment device (12) extends out of the support plate (11) into the output end and is connected with the combined exhaust pipeline (4).

3. A micro-UV waste gas treatment device according to claim 2, characterized in that, The waste gas flow sensor (7) and the exhaust quality sensor (10) are electrically connected with the input end of a waste gas treatment controller (14), and the output end of the waste gas treatment controller (14) is electrically connected with the waste gas treatment device (12), the recovery pipeline valve (6) and the recovery air extractor (9).

4. A micro-UV waste gas treatment device according to claim 3, characterized in that, The waste gas treatment controller (14) is communicatively connected with an analog quantity module (16), the waste gas flow sensor (7) and the exhaust quality sensor (10) are electrically connected with the input end of the analog quantity module (16), and the output end of the analog quantity module (16) is electrically connected with the waste gas treatment device (12).

5. A micro-UV waste gas treatment device according to claim 4, characterized in that, The polymeric exhaust pipe (4) corresponds to a group of waste gas treatment devices (12) sharing a microwave generating device (122), and the output end of the analog module (16) is electrically connected with the microwave generating device (122).

6. A micro-UV waste gas treatment device according to claim 5, wherein The waste gas treatment controller (14) is electrically connected and controlled with the recovery pipeline valve (6) and the recovery air extractor (9) through the control relay (17), and is in communication connection with the display screen (15).

7. A method of treating exhaust gas using the micro-UV exhaust gas treatment device according to claim 6, characterized by, The processing steps are: Step one, the VOCs waste gas enters the waste gas pipeline (3) and passes through the expansion guide groove (2) to reach the intake end of the processing and exhaust frame (1), and the waste gas flow sensor (7) senses the current waste gas flow; Step two, the waste gas treatment controller (14) calculates the initial degradation power according to the flow transmitted by the waste gas flow sensor (7), and generates control analog voltage / current to each microwave generating device (122); Step three, the microwave generating device (122) receives the control analog voltage / current, generates a microwave ultrahigh frequency electromagnetic field in the waste gas treatment frame (121), and generates bUVC rays from the ultraviolet lamp tube (126), the wavelength of the bUVC rays is 253.7nm, and the ultraviolet lamp tube (126) adopts a mercury amalgam driven ultraviolet sterilization lamp; Step four, the microwave ultrahigh frequency electromagnetic field pre-splits the waste gas VOCs molecules in the space separated by the partition plate (13) and the support plate (11) into small molecules; Step five, the bUVC rays break the bonds of the small molecule VOCs gas; Step six, at the same time of step four and step five, the bUVC rays irradiate the TiO2 nano coating catalytic layer on the photocatalyst plate (125) to generate hydroxyl oxidation group -OH, and the hydroxyl oxidation group -OH further breaks the bonds of the waste gas to convert the VOCs gas into harmless water and CO2; Step seven, the exhaust quality sensor (10) at the polymeric exhaust pipe (4) detects the exhaust quality of each group, and sends the detection result to the waste gas treatment controller (14), the waste gas treatment controller (14) compares the detection result with the set value to determine whether the exhaust quality meets the standard, if all meet the standard, the waste gas treatment is completed, if the exhaust quality of a group does not meet the standard, step eight is entered; Step eight, the waste gas treatment controller (14) controls the recovery pipeline valve (6) of the group with non-standard exhaust quality to open, starts the recovery air extractor (9), recycles the exhaust gas in the polymeric exhaust pipe (4) of the group with non-standard exhaust quality to the waste gas pipeline (3), the waste gas treatment controller (14) recalculates the secondary degradation power data of each group according to the non-standard exhaust quality, and generates control analog voltage / current to each microwave generating device (122), and repeats steps three to seven until the exhaust quality of all groups meets the standard, stops the recovery air extractor (9), and closes the recovery pipeline valve (6).

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