VOCs waste gas treatment equipment and use method thereof

Abstract

The invention discloses VOCs waste gas treatment equipment and a use method thereof, the VOCs waste gas treatment equipment comprises a main body and a control module, and the main body is provided with a universal telescopic gas collection pipeline, a dual-channel PID detection module and an exhaust port; one end of the universal telescopic gas collecting pipeline is provided with a gas collecting hood, and the other end of the universal telescopic gas collecting pipeline is communicated with the interior of the main body; a filtering unit and an adsorption unit are arranged in the main body; a gas exhaust pipe is arranged in an area between the adsorption unit and the main body, and an exhaust fan is arranged on the gas exhaust pipe. A second gas collecting pipe is arranged on the inner side of the exhaust port; the dual-channel PID detection module and the exhaust fan are electrically connected with the control module; according to the VOCs waste gas treatment equipment and the using method thereof, compared with the VOCs treatment equipment, the waste gas emission condition can be monitored in real time, the working mode can be automatically adjusted according to the VOCs concentration change, instant starting and efficient operation of the equipment are achieved, and invalid treatment and energy waste are avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of waste gas treatment, and in particular relates to a VOCs waste gas treatment device and a use method thereof. Background Art

[0002] Existing VOCs treatment equipment is usually used for organized exhaust gas, or the exhaust gas collected from unorganized VOCs emissions in production workshops and production lines. Generally, the air volume is large and the emissions are continuous. Therefore, the treatment equipment is generally large in size, occupies a large area, is installed on the ground or roof, and cannot be moved. For the mechanical repair link of auto repair companies, the ink roller cleaning link of printing companies, the parts cleaning link of mechanical equipment processing companies, the road marking line spraying link, etc., VOCs exhaust gas is characterized by short-term and intermittent emissions, and the operating space is small and the position is not fixed. If the current VOCs treatment equipment is used for the collection and treatment of such exhaust gas, since the gas collection port is far from the exhaust gas generation point, air is collected part of the time, which will cause a lot of ineffective treatment in time and space, resulting in waste of resources and energy, low gas collection efficiency, and high treatment cost.

[0003] In addition, the start and stop of existing VOCs treatment equipment is generally controlled manually, and is determined according to the start and stop time of production operations. This is applicable to industrial enterprises with long-term production operations, but it is not applicable to process links with uncertain operation time and frequent start and stop. If the treatment equipment is always turned on, it will cause a lot of idle time and waste energy; if the start and stop of the treatment equipment is manually controlled according to the start and stop of production operations, on the one hand, it will increase a lot of workload, and on the other hand, it will easily cause the equipment to be started untimely, resulting in the inability to effectively collect and treat VOCs. Summary of the invention

[0004] In view of the deficiencies in the above-mentioned background technology, the present invention aims to provide a VOCs waste gas treatment device and a method of using the same, which solves the problems of high energy consumption and low gas collection efficiency of existing VOCs treatment equipment when treating small amounts of gas and intermittently emitting VOCs waste gas.

[0005] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is as follows:

[0006] Provides a VOCs waste gas treatment device,

[0007] It includes a main body and a control module, wherein a universal telescopic gas collection pipeline and a dual-channel PID detection module are arranged on the outer wall of one side of the main body, and an exhaust port is arranged on the outer wall of the other side of the main body;

[0008] The universal telescopic gas collection pipeline is provided with a gas collection cover at one end, and the other end is connected to the interior of the main body; a first gas collection pipe is provided in the universal telescopic gas collection pipeline;

[0009] A filter unit and an adsorption unit are sequentially arranged inside the main body from left to right; the other end of the universal telescopic gas collecting pipe is connected to the area between the filter unit and the main body, a gas exhaust pipe is arranged in the area between the adsorption unit and the main body, an exhaust fan is arranged on the gas exhaust pipe, and the end of the gas exhaust pipe is connected to the exhaust port; a second gas collecting pipe is arranged in the gas exhaust pipe; the first gas collecting pipe and the second gas discharge pipe are respectively connected to the dual-channel PID detection module; a filter device is arranged on the first gas collecting pipe, and the filter device filters and dehumidifies the gas in the first gas collecting pipe to avoid clogging the dual-channel PID detection module.

[0010] The dual-channel PID detection module and the exhaust fan are both electrically connected to the control module.

[0011] Furthermore, the filter unit includes a primary filter material and a secondary filter material horizontally spaced inside the main body, and both the primary filter material and the secondary filter material include a first metal frame arranged inside the main body, and a filter plate is movably arranged inside each first metal frame, and the cross section of each filter plate is the same as the cross section inside the main body; the other end of the gas collection pipe is connected to the area between the primary filter material and the main body. Specifically, the filter plate is made of metal wire mesh or porous woven fabric. The pores of the filter plates in the primary filter material and the secondary filter material are inconsistent. The pores of the filter plate of the primary filter material are relatively large, which can achieve the function of filtering coarse particles. Conversely, the pores of the filter plate of the secondary filter material are relatively small, which can achieve the function of filtering fine particles.

[0012] Furthermore, the adsorption unit includes a second metal frame arranged inside the main body, and an adsorption material is movably arranged inside the second metal frame. Specifically, the adsorption material is made of activated carbon or zeolite. The cross section of the adsorption material is the same as the cross section inside the main body.

[0013] Furthermore, a notch penetrating the top of the main body is provided at the top of the first metal frame and the second metal frame, and the filter plate and the adsorption material are respectively provided in the first metal frame and the second metal frame through the notch. When replacing the filter unit and the adsorption unit, the filter unit and the adsorption unit can be replaced by taking the first metal frame and the second metal frame out of the main body.

[0014] Furthermore, a universal pulley is provided at the bottom of the main body, and the VOCs waste gas treatment equipment can be moved by providing the universal pulley, thereby improving the flexibility of use. The hood opening shape of the gas hood is a circular, oval or rectangular structure. The gas hood is made of stainless steel, and the appropriate hood opening type can be selected according to the waste gas emission point. The hood opening area should be slightly larger than the production operation surface. The gas hood and the gas collection pipe are connected by a quick connector for easy disassembly and assembly.

[0015] Furthermore, the wind speed of the cross section of the air collecting hood opening is 0.4m / s to 0.5m / s.

[0016] Furthermore, the control module includes a controller, a control panel and a main switch which are arranged on the main body and electrically connected to each other; pressure sensors are installed on the front and rear sides of the primary filter material and the secondary filter material; a timer is arranged in the adsorption unit; the pressure sensor and the timer are electrically connected to the controller; a display area and indicator lights are arranged on the control panel; the display area includes a concentration display area before gas purification, a concentration display area after gas purification, a primary pressure difference display area and a secondary pressure difference display area; the indicator lights include a start indicator light electrically connected to the controller, an adsorption unit replacement indicator light, a primary filter material replacement indicator light and a secondary filter material replacement indicator light.

[0017] The main switch is used to start the entire VOCs waste gas treatment equipment, and the start indicator light is used to indicate the opening state of the entire main switch; the dual-channel PID detection module monitors the exhaust gas concentration at the exhaust gas emission point, and can be displayed in real time through the concentration display area before gas purification; the dual-channel PID detection module is also used to monitor the gas concentration at the exhaust port, and can be displayed in real time through the concentration display area after gas purification; the pressure sensor monitors the pressure difference between the front and rear sides of the primary filter material and the secondary filter material, and the pressure difference is displayed through the primary pressure difference display area and the secondary pressure difference display area, and it can be judged whether to replace the primary filter material and the secondary filter material based on the pressure difference. After the primary filter material and the secondary filter material reach their service life, the primary filter material replacement indicator light and the secondary filter material replacement indicator light are used to remind replacement. The timer is used to time the service life of the adsorption unit, and after reaching the service life, the adsorption unit replacement indicator light is used to remind replacement.

[0018] The present invention also provides a method for using a VOCs waste gas treatment device, which comprises:

[0019] Step 1: Move the main body to the vicinity of the exhaust gas discharge point with small gas volume and intermittent discharge, and adjust the universal telescopic gas collection pipe so that the gas collection cover at its end is aligned with the exhaust gas discharge point;

[0020] Step 2: The dual-channel PID detection module collects and monitors the VOCs concentration value of the gas in the air in real time, and transmits the monitored VOCs concentration value of the gas to the control module;

[0021] Step 3: The control module obtains the VOCs concentration value of the gas in the air in real time. When the VOCs concentration value of the gas in the air is greater than the preset value, it is determined that waste gas appears in the environment, and the control module starts the exhaust fan and enters step 4, otherwise the exhaust fan does not work;

[0022] Step 4: The exhaust fan generates negative pressure, and the exhaust gas is adsorbed into the main body through the air collecting hood and the universal telescopic air collecting pipe. The filter unit and the adsorption unit filter and adsorb the exhaust gas inside the main body, and the treated exhaust gas is discharged through the exhaust port, completing the exhaust gas treatment work;

[0023] Step 5. The dual-channel PID detection module monitors the VOCs concentration of the exhaust gas at the exhaust port in real time through the second gas collection pipe. When the VOCs concentration of the exhaust gas exceeds the preset value, the control module issues an adsorption unit replacement warning and lights up the adsorption unit replacement indicator.

[0024] The beneficial effects of the present invention are:

[0025] 1. Compared with VOCs treatment equipment, the VOCs waste gas treatment equipment and its use method in the present invention can monitor the waste gas emission in real time, automatically adjust the working mode according to the change of VOCs concentration, realize the instant startup and efficient operation of the equipment, and avoid ineffective treatment and energy waste.

[0026] 2. A VOCs waste gas treatment device in the present invention is moved by setting a universal pulley to improve the flexibility of use; by setting a universal telescopic gas collection pipe and a gas collection hood, the length and direction can be adjusted as needed to ensure that the gas collection port is closely close to the waste gas emission point, thereby maximizing the waste gas collection efficiency and reducing air mixing.

[0027] 3. A VOCs waste gas treatment device in the present invention can monitor the use status of the filter unit and the adsorption unit online without manual monitoring, which facilitates timely replacement of the filter unit and the adsorption unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a structural schematic diagram of a VOCs waste gas treatment device.

[0029] Figure 2 Schematic diagram of the internal structure of the main body.

[0030] Figure 3 A schematic diagram of the structure of the control panel.

[0031] Among them, 1. main body; 2. universal telescopic gas collection pipeline; 3. dual-channel PID detection module; 4. exhaust port; 5. gas collection hood; 6. first gas collection pipe; 7. filter unit; 701. primary filter material; 702. secondary filter material; 8. adsorption unit; 9. gas exhaust pipe; 91. second gas collection pipe; 10. exhaust fan; 11. universal pulley; 12. control panel; 13. main switch; 14. concentration display area before gas purification; 15. concentration display area after gas purification; 16. primary pressure difference display area; 17. secondary pressure difference display area; 18. start indicator light; 19. adsorption unit replacement indicator light; 20. primary filter material replacement indicator light; 21. secondary filter material replacement indicator light. DETAILED DESCRIPTION

[0032] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0033] like Figure 1 to Figure 3 As shown, the present invention provides a VOCs waste gas treatment device, which includes a main body 1 and a control module, a universal telescopic gas collecting pipe 2 and a dual-channel PID detection module 3 are arranged on the outer wall of one side of the main body 1, and an exhaust port 4 is arranged on the outer wall of the other side of the main body 1; a gas collecting hood 5 is arranged at one end of the universal telescopic gas collecting pipe 2, and the other end is connected with the interior of the main body 1; a first gas collecting pipe 6 is arranged inside the universal telescopic gas collecting pipe 2; the arrangement of the universal telescopic gas collecting pipe 2 and the gas collecting hood 5 can adjust the length and direction as needed to ensure that the gas collecting port is closely close to the waste gas emission point, thereby maximizing the waste gas collection efficiency and reducing air mixing.

[0034] The inside of the main body 1 is provided with a filter unit 7 and an adsorption unit 8 in sequence from left to right; the other end of the universal telescopic gas collecting pipe 2 is connected to the area between the filter unit 7 and the main body 1, and a gas exhaust pipe 9 is provided in the area between the adsorption unit 8 and the main body 1, and an exhaust fan 10 is provided on the gas exhaust pipe 9, and the end of the gas exhaust pipe 9 is connected to the exhaust port 4; a second gas collection pipe 91 is provided in the gas exhaust pipe 9; the first gas collection pipe 6 and the second gas exhaust pipe 91 are respectively connected to the dual-channel PID detection module 3;

[0035] The dual-channel PID detection module 3 and the exhaust fan 10 are both electrically connected to the control module.

[0036] The basic principle of a VOCs waste gas treatment device of the present invention is: move the main body 1 to the vicinity of the waste gas emission point, and adjust the universal telescopic gas collection pipe 2 so that the gas collection cover 5 at its end is aligned with the waste gas emission point. The dual-channel PID detection module 33 collects the VOCs concentration value of the gas in the air in real time, and transmits the collected VOCs concentration value of the gas to the control module; the control module obtains the VOCs concentration value of the gas in the air in real time. When the VOCs concentration value of the gas in the air is greater than the preset value, it is determined that waste gas appears in the environment and the control module starts the exhaust fan 10 to work, otherwise the exhaust fan 10 does not work. The exhaust fan 10 generates negative pressure, and absorbs the waste gas into the main body through the gas collection cover 5 and the universal telescopic gas collection pipe 2. The filter unit 7 and the adsorption unit 8 filter and adsorb the waste gas inside the main body, and discharge the treated waste gas through the exhaust port 4 to complete the waste gas treatment work.

[0037] In summary, compared with VOCs treatment equipment, a VOCs waste gas treatment equipment in the present invention can monitor waste gas emissions in real time, automatically adjust the working mode according to changes in VOCs concentration, realize instant startup and efficient operation of the equipment, and avoid ineffective treatment and energy waste.

[0038] Specifically, the filter unit 7 includes a primary filter material 701 and a secondary filter material 702 which are horizontally spaced inside the main body 1. Both the primary filter material 701 and the secondary filter material 702 include a first metal frame arranged inside the main body 1. A filter plate is movably arranged inside each first metal frame. The cross section of each filter plate is the same as the cross section inside the main body 1. The other end of the gas collection pipe 6 is connected to the area between the primary filter material 701 and the main body 1. Specifically, the filter plate is made of a metal mesh or a porous woven fabric. The pores of the filter plates in the primary filter material 701 and the secondary filter material 702 are inconsistent. The pores of the filter plate of the primary filter material 701 are relatively large, which can achieve the function of filtering coarse particles. On the contrary, the pores of the filter plate of the secondary filter material 702 are relatively small, which can achieve the function of filtering fine particles.

[0039] Preferably, but not limited to, the adsorption unit 8 includes a second metal frame disposed inside the main body 1, and an adsorption material is movably disposed inside the second metal frame. Specifically, the adsorption material is made of activated carbon or zeolite. The cross section of the adsorption material is the same as the cross section inside the main body 1.

[0040] Preferably, the top of the first metal frame and the second metal frame are both provided with a notch penetrating the top of the main body 1, and the filter plate and the adsorption material are respectively provided in the first metal frame and the second metal frame through the notch. When replacing the filter unit 7 and the adsorption unit 8, the filter unit 7 and the adsorption unit 8 can be replaced by taking out the first metal frame and the second metal frame from the main body 1. At the same time, the replaced filter unit 7 and the adsorption unit 8 are transferred and disposed of as hazardous waste, and the adsorption unit 8 can be regenerated by "desorption + catalytic combustion" and then continued to be used.

[0041] Furthermore, a universal pulley 11 is provided at the bottom of the main body 1, and the universal pulley 11 is provided to realize the movement of the VOCs waste gas treatment equipment, thereby improving the flexibility of use. The hood opening of the gas hood 5 is circular, oval or rectangular, and the gas hood 5 is made of stainless steel. When the gas hood 5 is used specifically, a suitable hood opening type can be selected according to the waste gas emission point. The hood opening area of ​​the gas hood 5 should be slightly larger than the production operation surface. The gas hood 5 is connected to the gas collection pipe 6 by a quick connector for easy disassembly and assembly.

[0042] Furthermore, the control module includes a controller, a control panel 12 and a main switch 13 which are arranged on the main body 1 and electrically connected to each other; pressure sensors are installed on the front and rear sides of the primary filter material 701 and the secondary filter material 702; a timer is arranged in the adsorption unit 8; the gas concentration sensor, the pressure sensor and the timer are electrically connected to the controller; a display area and an indicator light are arranged on the control panel 12; the display area includes a concentration display area 14 before gas purification, a concentration display area 15 after gas purification, a primary pressure difference display area 16 and a secondary pressure difference display area 17; the indicator lights include a start indicator light 18 electrically connected to the controller, an adsorption unit replacement indicator light 19, a primary filter material replacement indicator light 20 and a secondary filter material replacement indicator light 21.

[0043] The main switch 13 is used to start the entire VOCs waste gas treatment equipment, and the start indicator light 18 is used to indicate the opening state of the entire main switch 13; the dual-channel PID detection module 3 monitors the exhaust gas concentration at the exhaust gas emission point, and can be displayed in real time through the concentration display area 14 before gas purification; the dual-channel PID detection module 3 is also used to monitor the gas concentration at the exhaust port 4, and can be displayed in real time through the concentration display area 15 after gas purification; the pressure sensor monitors the pressure difference between the front and rear sides of the primary filter material 701 and the secondary filter material 702, and the pressure difference is displayed through the primary pressure difference display area 16 and the secondary pressure difference display area 17, and it can be judged whether to replace the primary filter material 701 and the secondary filter material 702 according to the pressure difference. After the primary filter material 701 and the secondary filter material 702 reach their service life, the primary filter material replacement indicator light 20 and the secondary filter material replacement indicator light 21 remind them to replace them. The timer is used to count the service life of the adsorption unit 8, and after reaching the service life, the adsorption unit replacement indicator light 19 reminds them to replace it. The use status of the filter unit 7 and the adsorption unit 8 can be monitored online without manual monitoring, which is convenient for timely replacement of the filter unit 7 and the adsorption unit 8.

[0044] The present invention also provides a method for using a VOCs waste gas treatment device, which comprises:

[0045] Step 1: Move the main body 1 to the vicinity of the exhaust gas discharge point with small volume and intermittent discharge, and adjust the universal telescopic gas collection pipe 2 so that the gas collection cover 5 at its end is aligned with the exhaust gas discharge point;

[0046] Step 2, the dual-channel PID detection module 3 collects and monitors the VOCs concentration value of the gas in the air in real time, and transmits the monitored VOCs concentration value of the gas to the control module;

[0047] Step 3: The control module obtains the VOCs concentration value of the gas in the air in real time. When the VOCs concentration value of the gas in the air is greater than a preset value, it is determined that waste gas appears in the environment, and the control module starts the exhaust fan 10 to work and enters step 4, otherwise the exhaust fan 10 does not work;

[0048] Step 4: The exhaust fan 10 generates negative pressure, and absorbs the exhaust gas into the main body 1 through the air collecting hood 5 and the universal telescopic air collecting pipe 2. The filter unit 7 and the adsorption unit 8 filter and adsorb the exhaust gas inside the main body 1, and discharge the treated exhaust gas through the exhaust port 4, thereby completing the exhaust gas treatment work;

[0049] Step 5, the dual-channel PID detection module 3 monitors the VOCs concentration of the exhaust gas at the exhaust port in real time through the second gas collection pipe 91. When the VOCs concentration of the exhaust gas exceeds a preset value, the control module issues an adsorption unit 8 replacement warning and lights up the adsorption unit replacement indicator 19.

[0050] In specific applications, for example, in the painting operation of an auto repair company, once the VOCs concentration is detected to rise to a preset threshold, the device starts immediately, and the exhaust fan 10 works to efficiently collect exhaust gas. After the operation is completed, the device automatically enters the standby state and waits for the next start-up instruction. The entire process does not require manual intervention, which not only improves the processing efficiency, but also reduces the difficulty of operation and energy consumption.

[0051] In summary, the VOCs waste gas treatment equipment and the use method thereof in the present invention are used for the use scenarios of short-term and intermittent emission of VOCs waste gas. Through miniaturization, intelligence and modular design, they effectively solve the limitations of existing VOCs treatment equipment in specific application scenarios, realize efficient utilization of resources and friendly protection of the environment, and have significant social benefits and economic value.

Claims

1. A VOCs waste gas treatment device, characterized in that: It includes a main body and a control module, wherein a universal telescopic gas collection pipeline and a dual-channel PID detection module are arranged on the outer wall of one side of the main body, and an exhaust port is arranged on the outer wall of the other side of the main body; The universal telescopic gas collection pipeline is provided with a gas collection cover at one end, and the other end is connected to the interior of the main body; a first gas collection pipe is provided in the universal telescopic gas collection pipeline; A filter unit and an adsorption unit are sequentially arranged inside the main body from left to right; the other end of the universal telescopic gas collecting pipe is connected to the area between the filter unit and the main body, a gas exhaust pipe is arranged in the area between the adsorption unit and the main body, a blower is arranged on the gas exhaust pipe, and the end of the gas exhaust pipe is connected to the exhaust port; a second gas collection pipe is arranged in the gas exhaust pipe; the first gas collection pipe and the second gas exhaust pipe are respectively connected to the dual-channel PID detection module; The dual-channel PID detection module and the exhaust fan are both electrically connected to the control module.

2. The VOCs waste gas treatment equipment according to claim 1, characterized in that: The filter unit includes a primary filter material and a secondary filter material horizontally spaced apart inside the main body, the primary filter material and the secondary filter material both include a first metal frame arranged inside the main body, each of the first metal frames is movably provided with a filter plate, and the cross-section of each filter plate is the same as the cross-section inside the main body; the other end of the gas collection pipe is connected to the area between the primary filter material and the main body.

3. The VOCs waste gas treatment equipment according to claim 2, characterized in that: The adsorption unit comprises a second metal frame arranged inside the main body, an adsorption material is movably arranged inside the second metal frame, and a cross section of the adsorption material is the same as a cross section inside the main body.

4. The VOCs waste gas treatment equipment according to claim 3, characterized in that: The top of the first metal frame and the top of the second metal frame are both provided with a notch penetrating the top of the main body, and the filter plate and the adsorption material are respectively arranged in the first metal frame and the second metal frame through the notch.

5. The VOCs waste gas treatment equipment according to claim 2, characterized in that: The first gas collecting pipe is provided with a filtering device; the filter plate is made of metal wire mesh or porous woven fabric.

6. The VOCs waste gas treatment equipment according to claim 3, characterized in that: The adsorption material is made of activated carbon or zeolite.

7. The VOCs waste gas treatment equipment according to claim 1, characterized in that: A universal pulley is arranged at the bottom of the main body; the hood opening of the air collecting hood is in a circular, elliptical or rectangular structure.

8. The VOCs waste gas treatment equipment according to claim 1, characterized in that: The wind speed of the cross section of the air collecting hood opening is 0.4m / s to 0.5m / s.

9. The VOCs waste gas treatment equipment according to claim 2, characterized in that: The control module includes a controller, a control panel and a main switch which are arranged on the main body and electrically connected to each other; Pressure sensors are installed on the front and rear sides of the primary filter material and the secondary filter material; a timer is provided in the adsorption unit; the gas concentration sensor, the pressure sensor and the timer are all electrically connected to the controller; The control panel is provided with a display area and indicator lights; the display area includes a gas concentration display area before purification, a gas concentration display area after purification, a primary pressure difference display area and a secondary pressure difference display area; the indicator lights include a start indicator light electrically connected to the controller, an adsorption unit replacement indicator light, a primary filter material replacement indicator light and a secondary filter material replacement indicator light.

10. A method for using the VOCs waste gas treatment equipment according to any one of claims 1 to 9, characterized in that: include: Step 1: Move the main body to the vicinity of the exhaust gas discharge point with small gas volume and intermittent discharge, and adjust the universal telescopic gas collection pipe so that the gas collection cover at its end is aligned with the exhaust gas discharge point; Step 2: The dual-channel PID detection module collects and monitors the VOCs concentration value of the gas in the air in real time, and transmits the monitored VOCs concentration value of the gas to the control module; Step 3: The control module obtains the VOCs concentration value of the gas in the air in real time. When the VOCs concentration value of the gas in the air is greater than the preset value, it is determined that waste gas appears in the environment, and the control module starts the exhaust fan and enters step 4, otherwise the exhaust fan does not work; Step 4: The exhaust fan generates negative pressure, and the exhaust gas is adsorbed into the main body through the air collecting hood and the universal telescopic air collecting pipe. The filter unit and the adsorption unit filter and adsorb the exhaust gas inside the main body, and the treated exhaust gas is discharged through the exhaust port, completing the exhaust gas treatment work; Step 5. The dual-channel PID detection module monitors the VOCs concentration of the exhaust gas at the exhaust port in real time through the second gas collection pipe. When the VOCs concentration of the exhaust gas exceeds the preset value, the control module issues an adsorption unit replacement warning and lights up the adsorption unit replacement indicator.

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