A VOCs treatment system

Abstract

This utility model belongs to the field of VOCs-containing waste gas purification and treatment technology, and discloses a VOCs treatment system, including a first activated carbon adsorption-desorption box. The first activated carbon adsorption-desorption box has a VOCs gas inlet, a treated gas outlet, a thermal desorption gas inlet, and a desorbed gas outlet. The VOCs gas inlet, treated gas outlet, thermal desorption gas inlet, and desorbed gas outlet are respectively equipped with a first, second, third, and fourth shut-off valve. The treated gas outlet is connected to an exhaust system, the desorbed gas outlet is connected to the gas inlet of a regenerative catalytic combustion chamber, the gas outlet of the regenerative catalytic combustion chamber is connected to the hot inlet of a heat exchanger, the cold inlet of the heat exchanger is connected to a fresh air system, and the cold outlet of the heat exchanger is connected to the hot desorption gas inlet. A second activated carbon adsorption-desorption box with the same structure is connected in parallel with the first activated carbon adsorption-desorption box. This utility model uses one catalytic combustion device to treat a larger volume of VOCs waste gas, reducing the overall investment of the catalytic combustion device.

Description

Technical Field

[0001] This utility model belongs to the field of VOCs-containing waste gas purification and treatment technology, specifically relating to a VOCs treatment system. Background Technology

[0002] In the end-of-pipe treatment of VOCs, adsorption technology is currently the mainstream technology for treating VOCs from typical industrial sources. Activated carbon adsorption is a mature production process with high gas purification efficiency, and it has many practical applications and cases in treating large volumes of VOCs-containing waste gas with low to medium concentrations. However, current activated carbon adsorption only enriches VOCs in activated carbon without decomposing or destroying them. Large amounts of saturated activated carbon become hazardous waste, causing serious secondary pollution to the environment, and frequent replacement of activated carbon leads to high operating costs. Therefore, the desorption and regeneration of saturated activated carbon is of great significance for environmental protection, economic benefits, and resource utilization. Activated carbon adsorption concentration catalytic combustion technology is one of the existing mature processes, suitable for treating low-concentration, large-volume organic waste gas, and can effectively remove various harmful substances. This technology features strong system stability, simple maintenance, and suitability for long-term operation. In practical applications, the configuration of the activated carbon in-situ regeneration system needs to be determined based on the air volume to determine the number of catalytic combustion devices. When dealing with large volumes of gas containing volatile organic compounds (VOCs), the number of catalytic combustion devices must be increased, increasing the overall investment cost of the purification equipment. Summary of the Invention

[0003] To address the problems existing in the prior art, the purpose of this utility model is to provide a VOCs treatment system. This utility model uses a catalytic combustion device to treat a larger volume of VOCs waste gas and reduce the overall investment in the catalytic combustion device.

[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution: A VOCs treatment system includes a first activated carbon adsorption-desorption box, which has a VOCs gas inlet, a treated gas outlet, a thermal desorption gas inlet, and a desorbed gas outlet. The VOCs gas inlet, treated gas outlet, thermal desorption gas inlet, and desorbed gas outlet are respectively equipped with a first shut-off valve, a second shut-off valve, a third shut-off valve, and a fourth shut-off valve. The VOCs gas inlet is connected to a VOCs waste gas source, the treated gas outlet is connected to an exhaust system, the desorbed gas outlet is connected to the gas inlet of a regenerative catalytic combustion chamber, the gas outlet of the regenerative catalytic combustion chamber is connected to the hot inlet of a heat exchanger, the cold inlet of the heat exchanger is connected to a fresh air system, and the cold outlet of the heat exchanger is connected to the thermal desorption gas inlet. A second activated carbon adsorption-desorption box is connected in parallel with the first activated carbon adsorption-desorption box, and the second activated carbon adsorption-desorption box has the same structure as the first activated carbon adsorption-desorption box.

[0005] Preferably, both the first and second activated carbon adsorption-desorption chambers are equipped with VOCs gas detectors at their gas outlets. The VOCs gas detectors, the first shut-off valve, the second shut-off valve, the third shut-off valve, and the fourth shut-off valve are connected to an electrical control cabinet. During operation, when the electrical control cabinet determines that the VOCs gas content detected by the VOCs gas detector exceeds a preset value, the electrical control cabinet controls the first and second shut-off valves to close and the third and fourth shut-off valves to open; otherwise, the electrical control cabinet controls the first and second shut-off valves to open and the third and fourth shut-off valves to close.

[0006] The preferred VOCs treatment system of this utility model further includes a third activated carbon adsorption-desorption box, which is set on a movable trolley. The third activated carbon adsorption-desorption box has the same structure as the first activated carbon adsorption-desorption box. When the third activated carbon adsorption-desorption box needs to be regenerated, the third activated carbon adsorption-desorption box is connected in parallel with the first activated carbon adsorption-desorption box.

[0007] Preferably, the first activated carbon adsorption-desorption box, the second activated carbon adsorption-desorption box, and the third activated carbon adsorption-desorption box all use standard activated carbon boxes.

[0008] Preferably, the pipeline connecting the VOCs gas inlet to the VOCs exhaust gas source is equipped with a filter for filtering VOCs gas particles.

[0009] Preferably, the filter is a dry filter.

[0010] Preferably, a flame arrestor filter is installed on the pipeline connecting the desorbed gas outlet and the gas inlet of the regenerative catalytic combustion chamber.

[0011] Preferably, a temperature sensor is installed on the pipeline connecting the cold outlet of the heat exchanger and the inlet of the hot desorbed gas, and a flow regulating valve is installed at the cold inlet of the heat exchanger. Both the temperature sensor and the flow regulating valve are connected to a controller. The controller is used to receive the temperature detection data from the temperature sensor and compare the temperature detection data with a preset temperature value. If the temperature detection data is less than the preset temperature value, the controller controls the flow regulating valve to reduce the flow rate. If the temperature detection data is greater than the preset temperature value, the controller controls the flow regulating valve to increase the flow rate. When the temperature detection data is equal to the preset temperature value, the controller controls the flow regulating valve to maintain its opening.

[0012] Preferably, the exhaust system includes an exhaust stack, and the treated gas outlet is connected to the exhaust stack via a pipeline.

[0013] Preferably, the gas outlet of the regenerative catalytic combustion chamber is connected to the exhaust stack.

[0014] This utility model has the following beneficial effects: When treating VOCs-containing waste gas using this novel VOCs treatment system, the VOCs gas enters the first activated carbon adsorption-desorption chamber. Once the chamber is saturated, a shut-off valve is switched, and clean air heated by a heat exchanger enters through the hot desorption gas inlet of the first activated carbon adsorption-desorption chamber. This causes the VOCs adsorbed by the activated carbon in the chamber to volatilize due to heat, thus achieving desorption and regeneration of the activated carbon. The gas carrying the volatilized VOCs after regeneration is then sent to a regenerative catalytic combustion chamber. The chamber efficiently decomposes the VOCs through catalytic combustion, converting them into high-temperature clean gas. This purified high-temperature gas is then used as a heat source in the heat exchanger to heat air. Alternatively, the purified high-temperature gas can be reintroduced into the first activated carbon adsorption-desorption chamber to regenerate the saturated activated carbon, forming a closed-loop purification and regeneration process. Or, the purified high-temperature gas can be used as a heat source for other purposes. This process not only significantly improves the purification efficiency and regeneration capacity of activated carbon, effectively extending its service life, but also further enhances the energy efficiency and environmental performance of the entire system by recycling high-temperature clean gas. In this invention, a second activated carbon adsorption-desorption box is connected in parallel to the first activated carbon adsorption-desorption box. The second activated carbon adsorption-desorption box has the same structure as the first activated carbon adsorption-desorption box. Therefore, while the first activated carbon adsorption-desorption box is performing desorption, the system can switch to the second activated carbon adsorption-desorption box to treat VOCs, thus ensuring the continuity of the entire VOCs treatment system. Furthermore, after both the first and second activated carbon adsorption-desorption boxes have completed desorption, they can be connected in parallel to treat VOCs gas together. Therefore, this invention uses a single catalytic combustion device to treat a larger volume of VOCs waste gas, reducing the overall investment in the catalytic combustion device. It also allows for the further connection of more activated carbon adsorption-desorption boxes in parallel to the first activated carbon adsorption-desorption box, enabling the treatment of even larger volumes of VOCs waste gas.

[0015] Furthermore, the installation location of the backup activated carbon box (i.e., the third activated carbon adsorption-desorption box) is used for the desorption of other standardized activated carbon boxes. Using a single catalytic combustion device can handle a larger volume of VOCs waste gas, reducing the overall investment in the catalytic combustion device. In this way, the overall treatment capacity and regeneration efficiency of the system can be improved without increasing additional investment. At the same time, the continuity and reliability of waste gas treatment throughout the entire area can be further improved. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the VOCs treatment system in an embodiment of this utility model; Figure 2This is a schematic diagram of the structure of the standard activated carbon box used in the embodiments of this utility model.

[0017] In the diagram, 1-VOCs exhaust gas inlet, 2-filter, 3-first activated carbon adsorption-desorption box, 4-second activated carbon adsorption-desorption box, 8-VOCs gas detector alarm, 9-exhaust stack, 10-online monitoring device, 11-temperature sensor, 12-flame arrestor filter, 13-regenerative catalytic combustion chamber, 14-electrical control cabinet, 15-heat exchanger, 16-fresh air inlet, 17-first shut-off valve, 18-second shut-off valve, 19-third shut-off valve, 20-fourth shut-off valve, 21-VOCs gas inlet, 22-treated gas outlet, 23-thermal desorption gas inlet, 24-desorption gas outlet. Detailed Implementation

[0018] The detailed explanations provided below are exemplary and intended to provide a more in-depth analysis of this utility model. Unless otherwise specified, all technical and scientific terms used in this utility model should be consistent with their meanings commonly understood by those skilled in the art.

[0019] See Figure 1 and Figure 2The VOCs treatment system in this embodiment includes a first activated carbon adsorption-desorption box 3. The first activated carbon adsorption-desorption box 3 has a VOCs gas inlet 21, a treated gas outlet 22, a thermal desorption gas inlet 23, and a desorption gas outlet 24. The VOCs gas inlet 21, the treated gas outlet 22, the thermal desorption gas inlet 23, and the desorption gas outlet 24 are respectively equipped with a first shut-off valve 17, a second shut-off valve 18, a third shut-off valve 19, and a fourth shut-off valve 20. The VOCs gas inlet 21 is used to connect to a VOCs waste gas source. The treated gas outlet 22 is connected to an exhaust system. The desorption gas outlet 24 is connected to the gas inlet of a regenerative catalytic combustion chamber 13. The gas outlet of the regenerative catalytic combustion chamber 13 is connected to the hot inlet of a heat exchanger 15. The cold inlet of the heat exchanger 15 is connected to a fresh air system. The cold outlet of the heat exchanger 15 is connected to the thermal desorption gas inlet 23. The first activated carbon adsorption-desorption box 3 is connected in parallel with the second activated carbon adsorption-desorption box 4. The second activated carbon adsorption-desorption box 4 has the same structure as the first activated carbon adsorption-desorption box 3. Therefore, the connection relationship between the first activated carbon adsorption-desorption box 3 and the second activated carbon adsorption-desorption box 4 is exactly the same. If necessary, more activated carbon adsorption-desorption boxes can be connected in parallel to further treat a larger volume of VOCs waste gas. This embodiment only uses the parallel connection of two activated carbon adsorption-desorption boxes (i.e., the first activated carbon adsorption-desorption box 3 and the second activated carbon adsorption-desorption box 4) as an example for illustration. The working principle of this embodiment is as follows: The waste gas containing VOCs to be treated is fed from the VOCs gas inlet 21 into the first activated carbon adsorption-desorption box 3 and the second activated carbon adsorption-desorption box 4 (at this time, the first stop valve 17 and the second stop valve 18 are both open, and the third stop valve 19 and the fourth stop valve 20 are both closed). The first activated carbon adsorption-desorption box 3 and the second activated carbon adsorption-desorption box 4 adsorb the VOCs in the waste gas, and the waste gas after VOCs adsorption is discharged from the treated gas outlet 22. When the first activated carbon adsorption-desorption box 3 or the second activated carbon adsorption-desorption box 4 is saturated (the following explanation uses the example of the first activated carbon adsorption-desorption box 3 being saturated but the second activated carbon adsorption-desorption box 4 not yet saturated), the waste gas from the first activated carbon adsorption-desorption box 3 is... The first shut-off valve 17 and the second shut-off valve 18 are closed, and the third shut-off valve 19 and the fourth shut-off valve 20 on the first activated carbon adsorption-desorption box 3 are opened. At this time, the second activated carbon adsorption-desorption box 4 is still working normally (i.e., it is adsorbing the waste gas normally). At this time, the heat exchanger 15 uses the high-temperature gas generated by the regenerative catalytic combustion chamber 13 to heat the fresh air entering from the cold inlet of the heat exchanger 15. The heated fresh air flows out from the cold outlet of the heat exchanger 15 and enters the first activated carbon adsorption-desorption box 3 from the hot desorption gas inlet 23 to desorb the first activated carbon adsorption-desorption box 3. The gas containing VOCs generated after desorption flows out from the desorption gas outlet 24 and enters the regenerative catalytic combustion chamber 13 to decompose the VOCs and convert them into high-temperature clean gas.During the above process, at least one activated carbon adsorption-desorption box (first activated carbon adsorption-desorption box 3 or second activated carbon adsorption-desorption box 4) is always working normally. Therefore, this device has continuous processing capacity. At the same time, compared with one activated carbon adsorption-desorption box, this device can handle a larger volume of VOCs waste gas.

[0020] In addition, a switching valve can be installed on the cold outlet pipeline of heat exchanger 15. When desorption is required for a certain activated carbon adsorption-desorption box, the pipeline between the cold outlet of heat exchanger 15 and the hot desorption gas inlet 23 of the activated carbon adsorption-desorption box is connected. When all activated carbon adsorption-desorption boxes do not need desorption, the switching valve can be used to switch the hot air from the cold outlet of heat exchanger 15 to other places where it is needed.

[0021] In a preferred embodiment of this utility model, in this embodiment, the processing gas outlet 22 of both the first activated carbon adsorption-desorption box 3 and the second activated carbon adsorption-desorption box 4 is equipped with a VOCs gas detection alarm 8. The VOCs gas detection alarm 8, the first shut-off valve 17, the second shut-off valve 18, the third shut-off valve 19, and the fourth shut-off valve 20 are connected to an electrical control cabinet 14. During operation, when the electrical control cabinet 14 determines that the VOCs gas content detected by the VOCs gas detection alarm 8 exceeds a preset value (i.e., indicating that a certain activated carbon adsorption-desorption box is saturated), the electrical control cabinet 14 controls the first shut-off valve 17 and the second shut-off valve 18 to close, and the third shut-off valve 19 and the fourth shut-off valve 20 to open. At this time, the saturated activated carbon adsorption-desorption box is desorbed. Otherwise, the electrical control cabinet 14 controls the first shut-off valve 17 and the second shut-off valve 18 to open, and the third shut-off valve 19 and the fourth shut-off valve 20 to close. At this time, the activated carbon adsorption-desorption box that has completed desorption continues to operate.

[0022] As a preferred embodiment of this utility model, this embodiment also includes a third activated carbon adsorption-desorption box (the third activated carbon adsorption-desorption box generally refers to an activated carbon adsorption-desorption box that is saturated with adsorption. If other workstations have activated carbon adsorption-desorption boxes that are saturated with adsorption that cannot be processed, they can be transported to this device as third activated carbon adsorption-desorption boxes for desorption treatment. After desorption, they are sent away for use). Specifically, the third activated carbon adsorption-desorption box is set on a movable trolley. The third activated carbon adsorption-desorption box has the same structure as the first activated carbon adsorption-desorption box 3. When the third activated carbon adsorption-desorption box needs to be regenerated, it is connected in parallel with the first activated carbon adsorption-desorption box 3.

[0023] In a preferred embodiment of this utility model, the first activated carbon adsorption-desorption box 3, the second activated carbon adsorption-desorption box 4, and the third activated carbon adsorption-desorption box are all standard activated carbon boxes.

[0024] As a preferred embodiment of this utility model, in this embodiment, a filter 2 for filtering VOCs gas particles is provided on the pipeline connecting the VOCs gas inlet 21 and the VOCs waste gas source. This can minimize the impact of particulate matter in the waste gas clogging the pores of the activated carbon and affecting the adsorption effect.

[0025] Preferably, a temperature sensor 11 is installed on the pipeline connecting the cold outlet of the heat exchanger 15 and the hot desorption gas inlet 23, and a flow regulating valve is installed at the cold inlet of the heat exchanger 15. Both the temperature sensor 11 and the flow regulating valve are connected to a controller. The controller is used to receive the temperature detection data from the temperature sensor 11 and compare the temperature detection data with a preset temperature value. If the temperature detection data is less than the preset temperature value, the controller controls the flow regulating valve to reduce the flow rate. If the temperature detection data is greater than the preset temperature value, the controller controls the flow regulating valve to increase the flow rate. When the temperature detection data is equal to the preset temperature value, the controller controls the flow regulating valve to maintain its opening.

[0026] In a preferred embodiment of this invention, the exhaust system includes an exhaust stack 9, and the treated gas outlet 22 is connected to the exhaust stack 9 via a pipeline. Furthermore, the gas outlet of the regenerative catalytic combustion chamber 13 can be connected to the exhaust stack 9.

[0027] Example This embodiment of the VOCs treatment system includes a first activated carbon adsorption-desorption box 3, a second activated carbon adsorption-desorption box 4, a third activated carbon adsorption-desorption box, a VOCs gas detection alarm 8, an exhaust stack 9, an online monitoring device 10, a flame arrestor filter 12, a regenerative catalytic combustion device 13, and an electrical control cabinet 14. The first activated carbon adsorption-desorption box 3, the second activated carbon adsorption-desorption box 4, and the third activated carbon adsorption-desorption box all use standard activated carbon boxes. Specifically, the VOCs exhaust gas inlet 1 is connected to the VOCs gas inlet 21 of the first activated carbon adsorption-desorption box 3 and the second activated carbon adsorption-desorption box 4 via a pipeline to achieve gas flow. For ease of operation and control, the VOCs gas inlet 21 of the first activated carbon adsorption-desorption box 3, the second activated carbon adsorption-desorption box 4, and the third activated carbon adsorption-desorption box is equipped with a first shut-off valve 17, the treated gas outlet 22 is equipped with a second shut-off valve 18, the thermal desorption gas inlet 23 is equipped with a third shut-off valve 19, and the desorption gas outlet 24 is equipped with a fourth shut-off valve 19. The first activated carbon adsorption-desorption chamber 3 and the second activated carbon adsorption-desorption chamber 4 are connected in parallel.

[0028] A flame arrestor filter 12 is installed on the pipeline between the regenerative catalytic combustion device 13 and the desorbed gas outlet 20. A heat exchanger 15 is also installed between the regenerative catalytic combustion device 13 and the air inlet 16. The gas outlet of the regenerative catalytic combustion chamber 13 is connected to the hot inlet of the heat exchanger 15, the cold inlet of the heat exchanger 15 is connected to a fresh air system, and the cold outlet of the heat exchanger 15 is connected to the hot desorbed gas inlet 23. The regenerative catalytic combustion device 13 and the flame arrestor filter 12 are both based on existing technology; therefore, detailed descriptions of them will not be repeated in this invention. A mobile trolley is installed below the spare activated carbon box.

[0029] VOCs gas inlet 1 is connected to a VOCs source, which is the collection point of the plant's pipeline that generates VOCs gas. A filter 2 is installed on the VOCs gas inlet 1 pipeline to prevent fine particulate matter from clogging the pores of the activated carbon in the activated carbon adsorption-desorption box.

[0030] Both the first activated carbon adsorption-desorption chamber 3 and the second activated carbon adsorption-desorption chamber 4 are equipped with VOCs gas detectors 8 after the treated gas outlet 22. The VOCs gas detectors 8 are connected to the PLC in the electrical control cabinet 14. When the first activated carbon adsorption-desorption chamber 3 is performing adsorption, the VOCs gas inlet 21 and the treated gas outlet 22 of the first activated carbon adsorption-desorption chamber 3 are opened. When the VOCs gas detector 8 detects that the VOCs concentration at the treated gas outlet 22 exceeds the standard, it will alarm. At this time, the VOCs gas inlet 21 and the treated gas outlet 22 of the first activated carbon adsorption-desorption chamber 3 are closed, and the VOCs gas inlet 21 and the treated gas outlet 22 of the standard activated carbon chamber 4 are opened, switching to the second activated carbon adsorption-desorption chamber 4 for adsorption. Simultaneously, the hot desorption gas inlet 23 and desorption gas outlet 24 of the first activated carbon adsorption-desorption chamber 3 are opened. The high-temperature clean gas generated by the regenerative catalytic combustion device 13 is heated by the heat exchanger 15 and then blown into the first activated carbon adsorption-desorption chamber 3, causing the VOCs in the first activated carbon adsorption-desorption chamber 3 to volatilize due to heat, thus desorbing the activated carbon. The volatilized VOCs enter the regenerative catalytic combustion chamber 13, where the regenerative catalytic combustion device 13 decomposes the VOCs, thereby regenerating the activated carbon in the first activated carbon adsorption-desorption chamber 3, extending the service life of the first activated carbon adsorption-desorption chamber 3. After the desorption and regeneration of the first activated carbon adsorption-desorption chamber 3 is completed, cold air is introduced to cool the first activated carbon adsorption-desorption chamber 3. When the second activated carbon adsorption-desorption chamber 4 is saturated, the adsorption is similarly switched to the first activated carbon adsorption-desorption chamber 3 to perform adsorption and regeneration of the second activated carbon adsorption-desorption chamber 4. In addition, the first activated carbon adsorption-desorption chamber 3 and the second activated carbon adsorption-desorption chamber 4 can adsorb alternately or simultaneously.

[0031] Temperature sensors 11 are installed upstream of the hot desorption gas inlets 23 of the first activated carbon adsorption-desorption chamber 3 and the second activated carbon adsorption-desorption chamber 4. These sensors are also connected to the PLC of the electrical control cabinet 14 and are controlled by the electrical control cabinet 14. When the temperature of the hot air passing through the heat exchanger 15 is too high, the electrical control cabinet 14 controls the use of cold air to cool the hot air.

[0032] When the VOCs gas detector 8 installed at the gas outlet 22 of the activated carbon adsorption-desorption box detects that the VOCs concentration exceeds the standard, an alarm is triggered. At this time, the movable standard activated carbon adsorption box is installed at the backup third activated carbon adsorption-desorption box. After the regeneration and cooling of the first activated carbon adsorption-desorption box 3 are completed, the reserved backup third activated carbon adsorption-desorption box is desorbed and regenerated. The high-temperature clean gas generated by the regenerative catalytic combustion device 13 is heated by the heat exchanger 15 and then blown into the third activated carbon adsorption-desorption box, causing the VOCs in the third activated carbon adsorption-desorption box to volatilize due to heat, thus desorbing the activated carbon. The desorbed VOCs enter the regenerative catalytic combustion chamber 13, where the regenerative catalytic combustion device 13 decomposes the VOCs, thereby regenerating the activated carbon in the third activated carbon adsorption-desorption box, extending the life of the third activated carbon adsorption-desorption box. The number of standard activated carbon boxes to be reserved is determined based on the number of other activated carbon adsorption and desorption boxes in the plant area and the desorption, regeneration and cooling time of each standard activated carbon box, so as to ensure the continuous operation of the catalytic combustion device 13 and achieve the effect of energy saving and reducing operating costs.

[0033] By setting up a backup third activated carbon adsorption-desorption box, it can be shared by other activated carbon adsorption devices in a pre-defined area (such as an industrial park or enterprise) during sequential regeneration. The backup activated carbon box is shared by other activated carbon adsorption devices in the area (industrial park, enterprise) during sequential regeneration; the number of reserved locations for the backup activated carbon box can be flexibly adjusted according to the actual needs of the number of other activated carbon adsorption devices in the area (industrial park, enterprise) to adapt to the workload and waste gas treatment needs of different factories within the area. The number of standard activated carbon boxes in the activated carbon adsorption unit can be adjusted according to the VOCs waste gas intake volume to adapt to the workload and waste gas treatment needs of different factories. The standard activated carbon box has identification information, including built-in activated carbon parameters, and records, tracking, and query functions for purchase, use, replacement, regeneration, collection, and disposal information. The flexibility of a caster trailer (i.e., a mobile trolley) allows the reserved backup activated carbon box to be moved, enabling it to sequentially purify multiple activated carbon adsorption devices. This design not only greatly facilitates the movement and deployment of equipment but also improves the efficiency and flexibility of purification work and reduces investment in catalytic combustion devices. This makes the entire system demonstrate greater practical value in real-world applications.

[0034] In the above scheme, VOCs gas, after pretreatment, enters the activated carbon adsorption device. When the standardized activated carbon box in the adsorption device becomes saturated, the valve is switched to allow the VOCs waste gas to enter a fresh activated carbon box. By blowing high-temperature clean air into the device, the VOCs adsorbed by the activated carbon are heated and volatilized, thereby achieving desorption and regeneration of the activated carbon. Subsequently, these volatilized VOCs are sent to the catalytic combustion device under the strong drive of the exhaust fan. This device uses catalytic combustion to efficiently decompose the VOCs and convert them into high-temperature clean gas. This purified high-temperature gas is then heated in a heat exchanger and reintroduced into the activated carbon adsorption device to regenerate the saturated activated carbon box, forming a closed-loop purification and regeneration process. This process not only significantly improves the purification efficiency and regeneration capacity of the activated carbon and effectively extends its service life, but also further improves the energy efficiency and environmental performance of the entire system by recycling the high-temperature clean gas. The spare activated carbon box is installed in a location for desorption from other standardized activated carbon boxes. Using a single catalytic combustion unit can handle larger volumes of VOCs waste gas, reducing the overall investment in the catalytic combustion unit. In this way, the overall treatment capacity and regeneration efficiency of the system can be improved without additional investment, while further enhancing the continuity and reliability of waste gas treatment throughout the area.

[0035] By employing the above technical solution, combined with dispersed adsorption and activated carbon adsorption concentration catalytic combustion technology, organic pollutants in waste gas can be effectively treated, emission concentrations reduced, and efficient regeneration and recycling of activated carbon within the activated carbon adsorption unit achieved. Compared to traditional treatment facilities, the overall treatment capacity of the catalytic combustion system can be improved without additional investment.

[0036] The above description is merely a preferred embodiment of this utility model and is intended to demonstrate, not limit, its application scope. For those skilled in the art, this utility model possesses broad flexibility and variability, allowing for various adjustments, equivalent substitutions, and performance improvements. Therefore, any modifications, substitutions, or improvements that adhere to the core concepts and basic principles of this utility model should be considered to fall within its protection scope.

Claims

1. A VOCs treatment system, characterized by, The system includes a first activated carbon adsorption-desorption box (3), which has a VOCs gas inlet (21), a treated gas outlet (22), a thermal desorption gas inlet (23), and a desorption gas outlet (24). The VOCs gas inlet (21), the treated gas outlet (22), the thermal desorption gas inlet (23), and the desorption gas outlet (24) are respectively equipped with a first shut-off valve (17), a second shut-off valve (18), a third shut-off valve (19), and a fourth shut-off valve (20). The VOCs gas inlet (21) is used to connect to the VOCs waste gas source. Next, the processing gas outlet (22) is connected to an exhaust system, the desorbed gas outlet (24) is connected to the gas inlet of a regenerative catalytic combustion chamber (13), the gas outlet of the regenerative catalytic combustion chamber (13) is connected to the hot inlet of a heat exchanger (15), the cold inlet of the heat exchanger (15) is connected to a fresh air system, and the cold outlet of the heat exchanger (15) is connected to the hot desorbed gas inlet (23); the first activated carbon adsorption desorption box (3) is connected in parallel with the second activated carbon adsorption desorption box (4), and the second activated carbon adsorption desorption box (4) has the same structure as the first activated carbon adsorption desorption box (3).

2. The VOCs treatment system of claim 1, wherein, The processing gas outlets (22) of the first activated carbon adsorption-desorption box (3) and the second activated carbon adsorption-desorption box (4) are equipped with VOCs gas detection alarms (8). The VOCs gas detection alarms (8), the first shut-off valve (17), the second shut-off valve (18), the third shut-off valve (19) and the fourth shut-off valve (20) are connected to an electrical control cabinet (14). During operation, when the electrical control cabinet (14) determines that the VOCs gas detection alarms (8) have detected that the VOCs gas content exceeds the preset value, the electrical control cabinet (14) controls the first shut-off valve (17) and the second shut-off valve (18) to close and the third shut-off valve (19) and the fourth shut-off valve (20) to open. Otherwise, the electrical control cabinet (14) controls the first shut-off valve (17) and the second shut-off valve (18) to open and the third shut-off valve (19) and the fourth shut-off valve (20) to close.

3. The VOCs treatment system of claim 1, wherein, It also includes a third activated carbon adsorption-desorption box, which is set on a movable trolley. The third activated carbon adsorption-desorption box has the same structure as the first activated carbon adsorption-desorption box (3). When the third activated carbon adsorption-desorption box needs to be regenerated, the third activated carbon adsorption-desorption box and the first activated carbon adsorption-desorption box (3) are connected in parallel.

4. The VOCs treatment system of claim 3, wherein, The first activated carbon adsorption-desorption box (3), the second activated carbon adsorption-desorption box (4), and the third activated carbon adsorption-desorption box all use standard activated carbon boxes.

5. The VOCs treatment system of claim 1, wherein, The VOCs gas inlet (21) is connected to the VOCs exhaust gas source by a filter (2) for filtering VOCs gas particles.

6. The VOCs treatment system of claim 5, wherein, The filter (2) is a dry filter.

7. The VOCs treatment system of claim 1, wherein, A flame arrestor filter (12) is provided on the pipeline connecting the desorption gas outlet (24) and the gas inlet of the regenerative catalytic combustion chamber (13).

8. The VOCs treatment system of claim 1, wherein, A temperature sensor (11) is installed on the pipeline connecting the cold outlet of the heat exchanger (15) and the hot desorption gas inlet (23). A flow regulating valve is installed at the cold inlet of the heat exchanger (15). Both the temperature sensor (11) and the flow regulating valve are connected to a controller. The controller is used to receive the temperature detection data from the temperature sensor (11) and compare the temperature detection data with the preset temperature value. If the temperature detection data is less than the preset temperature value, the controller controls the flow regulating valve to reduce the flow rate. If the temperature detection data is greater than the preset temperature value, the controller controls the flow regulating valve to increase the flow rate. When the temperature detection data is equal to the preset temperature value, the controller controls the flow regulating valve to maintain its opening.

9. The VOCs treatment system of claim 1, wherein, The exhaust system includes an exhaust stack (9), and a gas processing outlet (22) is connected to the exhaust stack (9) via a pipeline.

10. The VOCs treatment system of claim 9, wherein, The gas outlet of the regenerative catalytic combustion chamber (13) is connected to the exhaust stack (9).

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