Automobile body coating waste gas purification system

Abstract

The utility model relates to the technical field of waste gas treatment, and provides an automobile body coating waste gas purification system which comprises a first pipeline, a rotating wheel adsorption and desorption device, a second pipeline, a first incineration device, a third pipeline, a second incineration device and an exhaust device. The first end of the first pipeline is used for being connected with a spraying waste gas source, the second end of the first pipeline is connected with the exhaust device, and the rotating wheel adsorption and desorption device is arranged on the first pipeline. The first end of the second pipeline is connected with the runner adsorption and desorption device, the second end of the second pipeline is connected with the exhaust device, and the first incineration device is arranged on the second pipeline; the first end of the third pipeline is used for being connected with a drying waste gas source, the second end of the third pipeline is connected with the exhaust device, and the second incineration device is arranged on the third pipeline. According to the automobile body coating waste gas purification system, large-air-volume and low-concentration spraying waste gas and small-air-volume and high-concentration drying waste gas are subjected to purification treatment through different treatment procedures, so that the purification efficiency is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste gas treatment, in particular to a vehicle body coating waste gas purification system. BACKGROUND

[0002] In the production process of vehicle body coating, the surface of the vehicle body needs to be painted and dried. The spraying stage produces large volume and low concentration gas, and the drying stage produces small volume and high concentration gas.

[0003] In the related art, the large volume and low concentration gas produced in the spraying stage and the small volume and high concentration gas produced in the drying stage are mixed and then enter the waste gas purification system for adsorption and purification, which results in low purification efficiency. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the present application provides a vehicle body coating waste gas purification system to solve the problem of low purification efficiency.

[0005] The first aspect of the present application provides a vehicle body coating waste gas purification system, comprising a first pipeline, a rotary adsorption and desorption device, a second pipeline, a first incineration device, a third pipeline, a second incineration device, and an exhaust device; the first end of the first pipeline is used to connect a spraying waste gas source, the second end of the first pipeline is connected to the exhaust device, and the rotary adsorption and desorption device is arranged on the first pipeline; the first end of the second pipeline is connected to the rotary adsorption and desorption device, the second end of the second pipeline is connected to the exhaust device, and the first incineration device is arranged on the second pipeline; the first end of the third pipeline is used to connect a drying waste gas source, the second end of the third pipeline is connected to the exhaust device, and the second incineration device is arranged on the third pipeline.

[0006] The vehicle body coating waste gas purification system provided by the present application has the following advantages: the large volume and low concentration spraying waste gas is collected and then enters the rotary adsorption and desorption device, the organic matter is adsorbed in the rotary adsorption and desorption device, and the purified gas is discharged from the exhaust device; the small volume and high concentration spraying waste gas formed by the desorption of the rotary adsorption and desorption device enters the first incineration device for incineration and decomposition, and then is discharged from the exhaust device. The small volume and high concentration drying waste gas is collected and then enters the second incineration device for incineration and decomposition, and then is discharged from the exhaust device. Since the large volume and low concentration spraying waste gas and the small volume and high concentration drying waste gas are purified by different treatment processes, the purification efficiency is high.

[0007] In some embodiments, the vehicle body coating waste gas purification system further comprises a waste heat recovery device, wherein,

[0008] The waste heat recovery device is arranged on the third pipeline and downstream of the second incineration device; and / or, the waste heat recovery device is arranged on the second pipeline and downstream of the first incineration device.

[0009] The beneficial effects of the above technical solution are as follows: the waste heat recovery device arranged on the third pipeline and downstream of the second incineration device can utilize the heat of the gas discharged by the first incineration device and / or the second incineration device to reduce the operation cost of the system.

[0010] In some embodiments, the waste heat recovery device comprises a first heat exchanger, an inlet pipeline, an outlet pipeline and a driving pump, the first heat exchanger is arranged on the third pipeline and downstream of the second incineration device, the inlet pipeline and the outlet pipeline are connected to the first heat exchanger, and the driving pump is arranged on the inlet pipeline.

[0011] The beneficial effects of the above technical solution are as follows: the heat exchange efficiency of the first heat exchanger is relatively high, and the waste heat recovery through the first heat exchanger is conducive to the effective recovery of the heat of the gas discharged by the second incineration device.

[0012] In some embodiments, the waste heat recovery device further comprises a water tank and a return pipeline, the water tank is arranged on the inlet pipeline, the first end of the return pipeline is connected to the outlet pipeline, and the second end of the return pipeline is connected to the water tank.

[0013] The beneficial effects of the above technical solution are as follows: when the water temperature of the outlet pipeline does not reach the set temperature, the water discharged from the first heat exchanger can re-enter the water tank through the return pipeline and then re-enter the first heat exchanger, so as to realize the circulation heating of the water.

[0014] In some embodiments, the automobile body coating exhaust gas purification system further comprises a first temperature relief pipeline, a first temperature relief valve and a first gas mixing tank, the first gas mixing tank is arranged on the second pipeline and downstream of the first incineration device, the first end of the first temperature relief pipeline is connected to the first incineration device, the second end of the first temperature relief pipeline is connected to the first gas mixing tank, and the first temperature relief valve is arranged on the first temperature relief pipeline.

[0015] The beneficial effects of the above technical solution are as follows: when the temperature in the combustion chamber of the first incineration device exceeds the alarm value, the first temperature relief valve is opened to discharge part of the heat into the first gas mixing tank, so as to ensure that the temperature and pressure in the combustion chamber of the first incineration device are stabilized within a reasonable range.

[0016] In some embodiments, the automobile body coating exhaust gas purification system further comprises a heat extraction pipeline, a heat extraction valve and a second heat exchanger, the first end of the heat extraction pipeline is connected to the first incineration device, the second end of the heat extraction pipeline is connected to the first gas mixing box, the heat extraction valve and the second heat exchanger are both arranged on the heat extraction pipeline, and the heat extraction valve is upstream of the second heat exchanger; wherein the second heat exchanger is connected to the rotary adsorption device.

[0017] The beneficial effects of the above technical solution are as follows: in this way, the second heat exchanger can directly utilize the heat source of the first incineration device, without the need for additional heat sources, thereby simplifying the system and reducing costs.

[0018] In some embodiments, the automobile body coating exhaust gas purification system further comprises a second heat extraction pipeline, a second heat extraction valve and a second gas mixing box, the second gas mixing box is arranged on the third pipeline and downstream of the second incineration device, the first end of the second heat extraction pipeline is connected to the second incineration device, the second end of the second heat extraction pipeline is connected to the second gas mixing box, and the second heat extraction valve is arranged on the second heat extraction pipeline.

[0019] The beneficial effects of the above technical solution are as follows: when the temperature in the combustion chamber of the second incineration device exceeds the alarm value, the second heat extraction valve is opened to discharge part of the heat into the second gas mixing box, so as to ensure that the temperature and pressure in the combustion chamber of the second incineration device are stabilized within a reasonable range.

[0020] In some embodiments, the automobile body coating exhaust gas purification system further comprises a first purge pipeline and a first purge valve, the first end of the first purge pipeline is connected to the second pipeline and upstream of the first incineration device, and the second end of the first purge pipeline is connected to the first incineration device; and / or, the automobile body coating exhaust gas purification system further comprises a second purge pipeline and a second purge valve, the first end of the second purge pipeline is connected to the third pipeline and upstream of the second incineration device, and the second end of the second purge pipeline is connected to the second incineration device.

[0021] The beneficial effects of the above technical solution are as follows: by controlling the first purge valve to perform negative pressure purging on the heat storage chamber of the first incineration device, part of the residual exhaust gas temporarily stored in the heat storage chamber is pumped to the furnace of the first incineration device for incineration treatment, so as to improve the purification effect. By controlling the second purge valve to perform negative pressure purging on the heat storage chamber of the second incineration device, part of the residual exhaust gas temporarily stored in the heat storage chamber is pumped to the furnace of the second incineration device for incineration treatment, so as to improve the purification effect.

[0022] In some embodiments, the automobile body painting exhaust gas purification system further comprises a first filter arranged on the first pipeline, the first filter being upstream of the rotary adsorption and desorption device; and / or the automobile body painting exhaust gas purification system further comprises a second filter arranged on the third pipeline, the second filter being upstream of the second incineration device.

[0023] In some embodiments, the first incineration device and / or the second incineration device is a rotary incinerator.

[0024] The beneficial effects of the above technical solution are as follows: the rotary incinerator has a relatively small size, thereby reducing the floor area.

[0025] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clear, the embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following will describe the specific embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or conventional technical description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without any creative effort.

[0027] Figure 1 is a structural schematic diagram of an automobile body painting exhaust gas purification system provided by some embodiments of the present application;

[0028] Figure 2 is a structural schematic diagram of an automobile body painting exhaust gas purification system provided by some embodiments of the present application;

[0029] Figure 3 is Figure 1 is a structural schematic diagram of a waste heat recovery device in the embodiment;

[0030] Figure 4 is a structural schematic diagram of a waste heat recovery device provided by some other embodiments of the present application.

[0031] The meanings of the marks in the drawings are as follows:

[0032] 100, automobile body painting exhaust gas purification system;

[0033] 1, first pipeline; 2, rotating adsorption and desorption device; 3, second pipeline; 4, first incineration device; 5, third pipeline; 6, second incineration device; 7, exhaust device; 8, waste heat recovery device; 9, first temperature relief pipeline; 10, first temperature relief valve; 11, first gas mixing box; 12, heat extraction pipeline; 13, heat extraction valve; 14, second heat exchanger; 15, second temperature relief pipeline; 16, second temperature relief valve; 17, second gas mixing box; 18, first purge pipeline; 19, first purge valve; 20, second purge pipeline; 21, second purge valve; 22, first filter; 23, second filter; 24, first fan; 25, second fan; 26, third fan; 27, fourth fan; 28, desorption control valve; 29, desorption temperature control valve; 81, first heat exchanger; 82, liquid inlet pipeline; 83, liquid outlet pipeline; 84, drive pump; 85, water tank; 86, liquid return pipeline; 87, liquid inlet valve; 88, liquid outlet valve; 89, liquid return valve. DETAILED DESCRIPTION

[0034] The embodiments of the technical scheme of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0036] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0037] In this paper, "embodiment" means that the specific features, structures or properties described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments. The skilled person in the art explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0038] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0039] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0040] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0041] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0042] An embodiment of the first aspect of this application provides a vehicle body painting exhaust gas purification system. Please refer to... Figure 1 The automotive body painting exhaust gas purification system 100 includes a first pipeline 1, a rotary suction desorption device 2, a second pipeline 3, a first incineration device 4, a third pipeline 5, a second incineration device 6, and an exhaust device 7. The first end of the first pipeline 1 is connected to the spraying exhaust gas source, and the second end of the first pipeline 1 is connected to the exhaust device 7. The rotary suction desorption device 2 is mounted on the first pipeline 1. The first end of the second pipeline 3 is connected to the rotary suction desorption device 2, and the second end of the second pipeline 3 is connected to the exhaust device 7. The first incineration device 4 is mounted on the second pipeline 3. The first end of the third pipeline 5 is connected to the drying exhaust gas source, and the second end of the third pipeline 5 is connected to the exhaust device 7. The second incineration device 6 is mounted on the third pipeline 5.

[0043] The rotary adsorption-desorption device 2 includes an adsorption zone, a desorption zone, and a cooling zone. The spraying exhaust gas enters the adsorption zone through the first pipe 1. Most of the spraying exhaust gas is purified by adsorption in the adsorption zone and then discharged through the exhaust device 7, meeting emission standards. A small portion of the unpurified spraying exhaust gas acts as cooling air to cool the desorption zone of the rotary adsorption-desorption device 2. This portion of the spraying exhaust gas is heated to approximately 110°C after passing through the desorption zone. Powered by the second fan 25 on the second pipe 3, it is then heated to approximately 200°C by the second heat exchanger 14, performing high-temperature desorption on the rotary adsorption-desorption device 2. The resulting high-concentration, low-volume spraying exhaust gas is powered by the third fan 26 and enters the first incineration device 4 through the second pipe 3 for high-temperature incineration before being discharged through the exhaust device 7, meeting emission standards. The rotary adsorption-desorption device 2 can be a zeolite rotor or an activated carbon rotor.

[0044] Optionally, the rotary suction desorption device 2 can control the concentration ratio to 15-25 times depending on the air volume, composition and concentration of the spraying exhaust gas.

[0045] Optionally, the desorption pipeline of the rotary suction desorption device 2 is equipped with a desorption control valve 28 and a desorption temperature control valve 29. The desorption control valve 28 controls the desorption process of the rotary suction desorption device 2, and the desorption temperature control valve 29 controls the temperature of the desorption zone entering the rotary suction desorption device 2. When the temperature of the desorption zone is too high, the opening of the desorption temperature control valve 29 is controlled to regulate the temperature and ensure that the temperature of the desorption zone is stable.

[0046] The first incineration device 4 and the second incineration device 6 can be the same or different.

[0047] When the first incineration device 4 and the second incineration device 6 are the same, the first incineration device 4 will be used as an example for explanation.

[0048] Optionally, the first incineration device 4 is a regenerative thermal oxidizer (RTO). The first incineration device 4 includes a regenerator chamber, a rotary valve, a combustion chamber, etc. The regenerator chamber is divided into five heat release zones, five heat storage zones, one dead zone, and one purging zone according to its function. The twelve zones are evenly distributed on the circumference. The intake, exhaust, and purging processes are controlled by the rotary valve. The pressure fluctuation of the rotary valve is small during rotation, which has little impact on the entire system.

[0049] Optionally, the heat storage material in the heat storage chamber can be plate-type honeycomb ceramic, which is used in conjunction with ceramic saddle rings. The heat storage ceramic has a large heat melting capacity, high product density, good thermal shock resistance, and is not easily damaged. Moreover, the heat recovery efficiency can reach more than 95%. The heat storage material can store most of the heat after the waste gas is burned for preheating the inlet waste gas, so that the temperature difference between the inlet and outlet of the first incineration device 4 is controlled within 40°C, resulting in significant energy saving effect.

[0050] The first incineration unit 4 is heated by a burner within the combustion chamber, with the combustion temperature controlled between 760-850℃ and the exhaust gas residence time ≥1s to ensure complete combustion and decomposition. A low-NOx burner is used to reduce the generation of secondary pollutants, NOx. Fuel is supplied to the first incineration unit 4 after filtration and pressure reduction, and an auxiliary combustion fan provides air for combustion. The air-fuel ratio is controlled by a proportional motor, achieving a burner-to-gas ratio of up to 1:40, thus reducing energy consumption.

[0051] Optionally, the exhaust device 7 is a chimney.

[0052] The beneficial effects of the automotive body painting exhaust gas purification system 100 provided in this application embodiment are as follows: Large-volume, low-concentration spraying exhaust gas is collected and first enters the rotary desorption device 2, where organic matter is adsorbed. The purified gas is then powered by the first fan 24 and discharged from the exhaust device 7 in compliance with standards. The small-volume, high-concentration spraying exhaust gas formed by desorption from the rotary desorption device 2 then enters the first incineration device 4 for incineration and decomposition, and is then powered by the fourth fan 27 and discharged from the exhaust device 7 in compliance with standards. Small-volume, high-concentration drying exhaust gas is collected and enters the second incineration device 6 for incineration and decomposition, and is then discharged from the exhaust device 7 in compliance with standards. Because the large-volume, low-concentration spraying exhaust gas and the small-volume, high-concentration drying exhaust gas are purified through different treatment processes, the purification efficiency is high and stable, and there is no risk of exceeding standards.

[0053] Please refer to Figure 1 In some embodiments, the vehicle body painting exhaust gas purification system 100 further includes a waste heat recovery device 8, which is located on the third pipeline 5 and downstream of the second incineration device 6.

[0054] The waste heat recovery device 8 is located downstream of the second incineration device 6. That is, the gas with heat discharged from the second incineration device 6 passes through the waste heat recovery device 8 and is then discharged from the exhaust device 7.

[0055] By adopting the above technical solution, and by setting up a waste heat recovery device 8 downstream of the second incineration device 6 on the third pipeline 5, the heat of the gas discharged from the second incineration device 6 can be utilized to reduce the operating cost of the system.

[0056] In other embodiments, the waste heat recovery device 8 may be installed on the second pipeline 3 and downstream of the first incineration device 4, such as... Figure 2 As shown. Alternatively, there are two waste heat recovery devices 8, one of which is located on the third pipeline 5 and downstream of the second incineration device 6, and the other of which is located on the second pipeline 3 and downstream of the first incineration device 4.

[0057] Please refer to Figure 4In some embodiments, the waste heat recovery device 8 includes a first heat exchanger 81, an inlet pipe 82, an outlet pipe 83, and a drive pump 84. The first heat exchanger 81 is located on the third pipe 5 and downstream of the second incineration device 6. The inlet pipe 82 and the outlet pipe 83 are both connected to the first heat exchanger 81, and the drive pump 84 is located on the inlet pipe 82.

[0058] The first heat exchanger 81 is located downstream of the second incineration device 6, meaning that the heated gas discharged from the second incineration device 6 passes through the first heat exchanger 81 and is then discharged from the exhaust device 7.

[0059] Both the inlet pipe 82 and the outlet pipe 83 are connected to the first heat exchanger 81. This can be understood as follows: under the drive of the drive pump 84, the liquid enters the first heat exchanger 81 through the inlet pipe 82 and then flows out through the outlet pipe 83. The liquid is heated when it passes through the first heat exchanger 81, that is, the liquid temperature in the outlet pipe 83 is higher than the liquid temperature in the inlet pipe 82.

[0060] By adopting the above technical solution, the heat exchange efficiency of the first heat exchanger 81 is relatively high. The recovery of waste heat through the first heat exchanger 81 is beneficial to the effective recovery of heat from the gas discharged from the second incineration device 6.

[0061] Please refer to Figure 3 In some embodiments, the waste heat recovery device 8 further includes a water tank 85 and a return liquid pipeline 86. The water tank 85 is located on the inlet liquid pipeline 82, the first end of the return liquid pipeline 86 is connected to the outlet liquid pipeline 83, and the second end of the return liquid pipeline 86 is connected to the water tank 85.

[0062] The system includes an inlet valve 87 on the inlet pipe 82, an outlet valve 88 on the outlet pipe 83, and a return valve 89 on the return pipe 86. During normal operation, the inlet valve 87 and outlet valve 88 are opened, and the return valve 89 is closed. Water first enters the water tank 85 through the inlet pipe 82, then enters the first heat exchanger 81 under the action of the drive pump 84, and is discharged from the outlet pipe 83. When the water temperature has not reached the set temperature, the inlet valve 87 and outlet valve 88 are closed, and the return valve 89 is opened. Under the action of the drive pump 84, water enters the first heat exchanger 81, and then flows back to the water tank 85 through the return pipe 86. This cycle continues until the water temperature reaches the set temperature.

[0063] By adopting the above technical solution, when the water temperature in the outlet pipe 83 does not reach the set temperature, the water coming out of the first heat exchanger 81 can be re-entered into the water tank 85 through the return pipe 86 and then re-enter the first heat exchanger 81 to achieve water circulation heating.

[0064] Please refer to Figure 1In some embodiments, the automotive body painting exhaust gas purification system 100 further includes a first unloading pipe 9, a first unloading valve 10, and a first mixing box 11. The first mixing box 11 is located on the second pipe 3 and downstream of the first incineration device 4. The first end of the first unloading pipe 9 is connected to the first incineration device 4, and the second end of the first unloading pipe 9 is connected to the first mixing box 11. The first unloading valve 10 is located on the first unloading pipe 9.

[0065] By adopting the above technical solution, when the temperature inside the combustion chamber of the first incineration device 4 exceeds the alarm value, the first heat relief valve 10 opens to release some heat into the first mixing chamber 11, so as to ensure that the temperature and pressure inside the combustion chamber of the first incineration device 4 are stable within a reasonable range.

[0066] Please refer to Figure 1 In some embodiments, the automotive body painting exhaust gas purification system 100 further includes a heat extraction pipeline 12, a heat extraction valve 13, and a second heat exchanger 14. The first end of the heat extraction pipeline 12 is connected to the first incineration device 4, and the second end of the heat extraction pipeline 12 is connected to the first mixing box 11. The heat extraction valve 13 and the second heat exchanger 14 are both located on the heat extraction pipeline 12, and the heat extraction valve 13 is located upstream of the second heat exchanger 14. The second heat exchanger 14 is connected to the rotary desorption device 2.

[0067] Specifically, the hot-side inlet of the second heat exchanger 14 is connected to the first incineration device 4, and the heat extracted from the first incineration device 4 is controlled by the heat extraction valve 13. The hot-side outlet of the second heat exchanger 14 is connected to the first mixing box 11. The cold-side inlet of the second heat exchanger 14 is connected to the cooling zone outlet of the rotary suction desorption device 2. The cold-side outlet of the second heat exchanger 14 is connected to the desorption zone inlet of the rotary suction desorption device 2. The cooling air can be heated from about 110°C to about 200°C through the second heat exchanger 14, and then the rotary suction desorption device 2 is desorbed at high temperature.

[0068] Based on the above scheme, the second heat exchanger 14 can directly utilize the heat source of the first incineration device 4 without the need for an additional heat source, which is more energy-efficient and can simplify the system and reduce costs.

[0069] Please refer to Figure 1 In some embodiments, the automotive body painting exhaust gas purification system 100 further includes a second unloading pipe 15, a second unloading valve 16, and a second mixing chamber 17. The second mixing chamber 17 is located on the third pipe 5 and downstream of the second incineration device 6. The first end of the second unloading pipe 15 is connected to the second incineration device 6, and the second end of the second unloading pipe 15 is connected to the second mixing chamber 17. The second unloading valve 16 is located on the second unloading pipe 15.

[0070] By adopting the above technical solution, when the temperature in the combustion chamber of the second incineration device 6 exceeds the alarm value, the second heat relief valve 16 opens to release some heat into the second mixing box 17, so as to ensure that the temperature and pressure in the combustion chamber of the second incineration device 6 are stable within a reasonable range.

[0071] Please refer to Figure 1 In some embodiments, the vehicle body painting exhaust gas purification system 100 further includes a first purge pipe 18 and a first purge valve 19. The first end of the first purge pipe 18 is connected to the second pipe 3 and is located upstream of the first incineration device 4. The second end of the first purge pipe 18 is connected to the first incineration device 4.

[0072] By controlling the first purge valve 19 to purge the heat storage chamber of the first incineration device 4 under negative pressure, some of the residual unpurified waste gas temporarily stored in the heat storage chamber is drawn into the furnace of the first incineration device 4 for incineration treatment, so as to improve the purification effect.

[0073] In some embodiments, the vehicle body painting exhaust gas purification system 100 further includes a second purge pipe 20 and a second purge valve 21. The first end of the second purge pipe 20 is connected to the third pipe 5 and is located upstream of the second incineration device 6. The second end of the second purge pipe 20 is connected to the second incineration device 6.

[0074] By controlling the second purge valve 21 to purge the regenerator chamber of the second incineration device 6 under negative pressure, some of the residual unpurified waste gas temporarily stored in the regenerator chamber is drawn into the furnace of the second incineration device 6 for incineration treatment, so as to improve the purification effect.

[0075] Please refer to Figure 1 In some embodiments, the automotive body painting exhaust gas purification system 100 further includes a first filter 22 disposed on the first pipeline 1, the first filter 22 being located upstream of the rotary suction desorption device 2; the automotive body painting exhaust gas purification system 100 further includes a second filter 23 disposed on the third pipeline 5, the second filter 23 being located upstream of the second incineration device 6.

[0076] The first filter 22 can filter out large particulate dust such as paint mist in the spraying exhaust gas.

[0077] Optionally, the first filter 22 includes four stages of filtration: G4, F7, F9, and H10, to filter particulate matter in the spraying exhaust gas. After passing through the first filter 22, the size of particulate matter in the spraying exhaust gas can be controlled to below 1 μm. This prevents particulate matter in the spraying exhaust gas from clogging the adsorption pores of the adsorption medium during subsequent adsorption treatment by the rotary adsorption desorption device 2, and helps the adsorption medium maintain a high adsorption effect for a long time.

[0078] The air filtration levels, from lowest to highest, are: G1, G2, G3, G4, F5, F6, F7, F8, F9, H10, H11, H12, H13, and H14. Levels G1 to G4 are suitable for general air filters, levels F5 to F9 are suitable for high-efficiency air filters, and levels H10 to H14 are suitable for ultra-high-efficiency air filters.

[0079] The second filter 23 can filter out large particles of dust such as grease in the drying exhaust gas.

[0080] In some embodiments, the first incineration device 4 and / or the second incineration device 6 are rotary incinerators.

[0081] It can be understood that the first incineration device 4 and the second incineration device 6 are both rotary incinerators; or, the first incineration device 4 is a rotary incinerator and the second incineration device 6 is an incinerator of other types; or, the first incineration device 4 is an incinerator of other types and the second incineration device 6 is a rotary incinerator.

[0082] Based on the above scheme, the rotary incinerator is relatively small in size, which can reduce the floor space required.

[0083] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. An automobile body coating exhaust gas purification system characterized by comprising: The automobile body coating exhaust gas purification system comprises a first pipeline, a rotary adsorption and desorption device, a second pipeline, a first incineration device, a third pipeline, a second incineration device and an exhaust device; a first end of the first pipeline is used for connecting a spray exhaust gas source, a second end of the first pipeline is connected to the exhaust device, and the rotary adsorption and desorption device is arranged on the first pipeline; a first end of the second pipeline is connected to the rotary adsorption and desorption device, a second end of the second pipeline is connected to the exhaust device, and the first incineration device is arranged on the second pipeline; a first end of the third pipeline is used for connecting a drying exhaust gas source, a second end of the third pipeline is connected to the exhaust device, and the second incineration device is arranged on the third pipeline.

2. The automobile body coating exhaust gas purification system according to claim 1, characterized by: The automobile body coating exhaust gas purification system further comprises a waste heat recovery device, wherein the waste heat recovery device is arranged on the third pipeline and downstream of the second incineration device; and / or the waste heat recovery device is arranged on the second pipeline and downstream of the first incineration device.

3. The automobile body coating exhaust gas purification system according to claim 2, characterized by: The waste heat recovery device comprises a first heat exchanger, a liquid inlet pipeline, a liquid outlet pipeline and a driving pump; the first heat exchanger is arranged on the third pipeline and downstream of the second incineration device; the liquid inlet pipeline and the liquid outlet pipeline are both connected to the first heat exchanger; and the driving pump is arranged on the liquid inlet pipeline.

4. The automobile body coating exhaust gas purification system according to claim 3, characterized by: The waste heat recovery device further comprises a water tank and a liquid return pipeline; the water tank is arranged on the liquid inlet pipeline; a first end of the liquid return pipeline is connected to the liquid outlet pipeline; and a second end of the liquid return pipeline is connected to the water tank.

5. The automobile body coating exhaust gas purification system according to claim 1, wherein: The automobile body coating exhaust gas purification system further comprises a first temperature relief pipeline, a first temperature relief valve and a first gas mixing box; the first gas mixing box is arranged on the second pipeline and downstream of the first incineration device; a first end of the first temperature relief pipeline is connected to the first incineration device; a second end of the first temperature relief pipeline is connected to the first gas mixing box; and the first temperature relief valve is arranged on the first temperature relief pipeline.

6. The automobile body coating exhaust gas purification system according to claim 5, wherein: The automobile body coating exhaust gas purification system further comprises a heat extraction pipeline, a heat extraction valve and a second heat exchanger; a first end of the heat extraction pipeline is connected to the first incineration device; a second end of the heat extraction pipeline is connected to the first gas mixing box; the heat extraction valve and the second heat exchanger are both arranged on the heat extraction pipeline, and the heat extraction valve is upstream of the second heat exchanger; and the second heat exchanger is connected to the rotary adsorption and desorption device.

7. The automobile body coating exhaust gas purification system according to claim 1, wherein: The automobile body coating exhaust gas purification system further comprises a second temperature relief pipeline, a second temperature relief valve and a second gas mixing box; the second gas mixing box is arranged on the third pipeline and downstream of the second incineration device; a first end of the second temperature relief pipeline is connected to the second incineration device; a second end of the second temperature relief pipeline is connected to the second gas mixing box; and the second temperature relief valve is arranged on the second temperature relief pipeline.

8. The automobile body coating exhaust gas purification system according to any one of claims 1 to 7, characterized by: The automobile body coating exhaust gas purification system further comprises a first purging pipeline and a first purging valve, a first end of the first purging pipeline is connected with the second pipeline and is upstream of the first incineration device, and a second end of the first purging pipeline is connected with the first incineration device; and / or the automobile body coating exhaust gas purification system further comprises a second purging pipeline and a second purging valve, a first end of the second purging pipeline is connected with the third pipeline and is upstream of the second incineration device, and a second end of the second purging pipeline is connected with the second incineration device.

9. The automobile body coating exhaust gas purification system according to any one of claims 1 to 7, characterized by: The automobile body coating exhaust gas purification system further comprises a first filter arranged on the first pipeline, and the first filter is upstream of the rotary adsorption and desorption device; and / or the automobile body coating exhaust gas purification system further comprises a second filter arranged on the third pipeline, and the second filter is upstream of the second incineration device.

10. The automobile body coating exhaust gas purification system according to any one of claims 1 to 7, characterized by: The first incineration device and / or the second incineration device is a rotary incineration furnace.

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