Coating system

Abstract

The utility model relates to a coating system, and belongs to the technical field of waste gas recovery, the coating system comprises a coating oven system, a heat exchange recovery system and a tail gas treatment system, the heat exchange recovery system comprises a waste heat recovery module and a heat pump module, the waste heat recovery module heats input gas flowing to the coating oven system for the first time through high-temperature waste gas exhausted by the coating oven system and converts the high-temperature waste gas into low-temperature waste gas, and the heat pump module is used for converting low-grade heat of the low-temperature waste gas into high-grade heat. The waste heat recovery module further utilizes high-grade heat to conduct secondary heating on input gas, and the tail gas treatment system is used for receiving and treating at least part of low-temperature waste gas. According to the coating system provided by the invention, the heat of the waste gas is fully utilized by the coating system to heat the input gas entering the coating oven system, so that the heat recycling rate of the coating system is improved, and the overall operation energy consumption of the coating system is reduced.

Description

Technical Field

[0001] This application relates to the technical field of waste gas recovery, and particularly to a coating system. Background Art

[0002] In the field of lithium battery manufacturing technology, coating machines generate a large amount of NMP (N-methylpyrrolidone) waste gas or high-temperature waste gas. Directly discharging the waste gas into the atmosphere will pollute the atmospheric environment, and usually, a waste heat recovery system is also required for recovery and treatment. In traditional systems, the waste gas discharged from the coating machine needs to be cooled before further treatment, while the gas entering the coating machine needs to be heated before entering the coating machine. The operating energy consumption of such a system is often relatively high. Summary of the Utility Model

[0003] Based on this, it is necessary to provide a coating system to solve the technical problem of high energy consumption in waste gas recovery of the coating system in the prior art.

[0004] To achieve the above object, this application provides a coating system, which includes:

[0005] A coating oven system;

[0006] A heat exchange and recovery system, including a waste heat recovery module and a heat pump module. The waste heat recovery module uses the high-temperature waste gas discharged from the coating oven system to heat the input gas flowing to the coating oven system for the first time and converts the high-temperature waste gas into low-temperature waste gas. The heat pump module is used to convert the low-grade heat of the low-temperature waste gas into high-grade heat. The waste heat recovery module also uses the high-grade heat to heat the input gas for the second time; and

[0007] An exhaust gas treatment system for receiving and treating at least part of the low-temperature waste gas.

[0008] Optionally, the coating oven system includes:

[0009] An oven body having a first exhaust port, a second exhaust port, and an air inlet. The air inlet is simultaneously connected to the second exhaust port and the waste heat recovery module;

[0010] A first exhaust fan for transporting the high-temperature waste gas discharged from the first exhaust port to the waste heat recovery module; and

[0011] A circulation fan for transporting the gas discharged from the second exhaust port and the input gas discharged from the waste heat recovery module to the air inlet.

[0012] Optionally, the coating oven system further includes a plurality of first air valves for controlling the air volume. First air valves are provided between the circulation fan and the second exhaust port, between the circulation fan and the waste heat recovery module, and between the circulation fan and the air inlet.

[0013] Optionally, the coating oven system further includes a heater for assisting in heating the input gas, and the heater is disposed between the circulation fan and the air inlet.

[0014] Optionally, multiple coating oven systems are provided, and a plurality of coating oven systems share a heat exchange recovery system.

[0015] Optionally, the waste heat recovery module is disposed at a suitable position such as the side of the coating oven system.

[0016] Optionally, the waste heat recovery module includes:

[0017] An air-to-air heat exchanger, whose inlet is connected to the first exhaust port of the coating oven system. The air-to-air heat exchanger has a first gas passage and a second gas passage. The high-temperature waste gas discharged from the coating oven system passes through the first gas passage, and the input gas flowing towards the air inlet of the coating oven system passes through the second gas passage. The high-temperature waste gas conducts the first heating on the input gas and converts the high-temperature waste gas into low-temperature waste gas;

[0018] A second exhaust fan, disposed between the air-to-air heat exchanger and the first exhaust port;

[0019] A return air fan, disposed between the air-to-air heat exchanger and the air inlet; and

[0020] A high-temperature heat exchanger, disposed between the return air fan and the air inlet. The high-temperature heat exchanger uses the heat of the low-temperature waste gas to conduct the second heating on the input gas.

[0021] Optionally, the input gas is low-temperature waste gas and / or fresh air from the external environment.

[0022] Optionally, the heat pump module includes:

[0023] A heat pump unit, including a low-temperature refrigerant heat exchanger, a high-temperature refrigerant heat exchanger, a low-temperature compressor, a high-temperature compressor, etc. The low-temperature refrigerant heat exchanger, the low-temperature compressor, and the high-temperature compressor convert the low-grade heat of the low-temperature waste gas into high-grade heat. A circulation flow path is formed between the high-temperature refrigerant heat exchanger and the high-temperature heat exchanger. The high-temperature refrigerant heat exchanger uses the high-grade heat to heat the liquid in the circulation flow path; and

[0024] A circulation pump, used to drive the liquid to flow in the circulation flow path.

[0025] Optionally, the heat pump module further includes a high-temperature buffer tank for heat storage. The high-temperature buffer tank is disposed between the inlet of the high-temperature refrigerant heat exchanger and the outlet of the high-temperature heat exchanger, and the circulation pump is disposed between the high-temperature buffer tank and the high-temperature refrigerant heat exchanger.

[0026] The beneficial effects of the coating system provided by this application are as follows: Compared with the prior art, the coating system of this application includes a coating oven system, a heat exchange and recovery system, and a tail gas treatment system. The heat exchange and recovery system includes a waste heat recovery module and a heat pump module. The waste heat recovery module uses the high-temperature waste gas discharged from the coating oven system to heat the input gas flowing into the coating oven system for the first time and converts the high-temperature waste gas into low-temperature waste gas. The heat pump module is used to convert the low-grade heat of the low-temperature waste gas into high-grade heat. The waste heat recovery module also uses the high-grade heat to heat the input gas for the second time, making full use of the heat of the waste gas to heat the input gas entering the coating oven system, improving the heat recovery utilization rate of the coating system and reducing the overall operating energy consumption of the coating system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0028] Figure 1 Structural schematic diagram of the coating system provided by the first embodiment of this application;

[0029] Figure 2 Structural schematic diagram of the coating oven system of the coating system provided by the first embodiment of this application;

[0030] Figure 3 Structural schematic diagram of the waste heat recovery module of the coating system provided by the first embodiment of this application;

[0031] Figure 4 Structural schematic diagram of the heat pump module of the coating system provided by the first embodiment of this application;

[0032] Figure 5 Structural schematic diagram of the coating system provided by the second embodiment of this application;

[0033] Figure 6 Structural schematic diagram of the coating oven system of the coating system provided by the second embodiment of this application;

[0034] Figure 7 Structural schematic diagram of the waste heat recovery module of the coating system provided by the second embodiment of this application;

[0035] Figure 8 Structural schematic diagram of the heat pump module of the coating system provided by the second embodiment of this application;

[0036] Figure 9Schematic structural diagram of the coating system provided by the third embodiment of the present application;

[0037] Figure 10 Schematic structural diagram of the coating oven system of the coating system provided by the third embodiment of the present application;

[0038] Figure 11 Schematic structural diagram of the waste heat recovery module of the coating system provided by the third embodiment of the present application;

[0039] Figure 12 Schematic structural diagram of the heat pump module of the coating system provided by the third embodiment of the present application;

[0040] Figure 13 Schematic structural diagram of the coating system provided by the fourth embodiment of the present application;

[0041] Figure 14 Schematic structural diagram of the coating oven system of the coating system provided by the fourth embodiment of the present application;

[0042] Figure 15 Schematic structural diagram of the waste heat recovery module of the coating system provided by the fourth embodiment of the present application;

[0043] Figure 16 Schematic structural diagram of the heat pump module of the coating system provided by the fourth embodiment of the present application.

[0044] Explanation of reference numerals:

[0045] 1. Coating oven system; 110. Oven body; 111. First exhaust port; 112. Second exhaust port; 113. Air inlet; 120. First exhaust fan; 130. Circulation fan; 140. First air valve; 150. Heater;

[0046] 2. Heat exchange recovery system; 210. Waste heat recovery module; 211. Gas-gas heat exchanger; 212. High-temperature heat exchanger; 213. Second exhaust fan; 214. Return air fan; 215. Low-temperature heat exchanger; 216. Demister; 217. Primary and secondary filters; 220. Heat pump module; 221. Heat pump unit; 2211. Low-temperature refrigerant heat exchanger; 2212. High-temperature refrigerant heat exchanger; 222. Circulation pump; 223. High-temperature buffer tank; 224. Second air valve; 225. Chiller;

[0047] 3. Tail gas treatment system. Detailed implementation manners

[0048] To make the above objects, features, and advantages of the present application more apparent and understandable, the following provides a detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings. Many specific details are set forth in the following description to facilitate a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0049] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0050] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0051] In the present application, unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0052] In the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over", and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath", and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0053] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation.

[0054] According to one aspect of the present application, embodiments of the present application provide a coating system. Please refer to Figures 1 to 16 , the coating system includes a coating oven system 1, a heat exchange recovery system 2 and an exhaust gas treatment system 3. The heat exchange recovery system 2 includes a waste heat recovery module 210 and a heat pump module 220. The waste heat recovery module 210 uses the high-temperature exhaust gas discharged from the coating oven system 1 to perform the first heating on the input gas flowing to the coating oven system 1 and converts the high-temperature exhaust gas into low-temperature exhaust gas. The heat pump module 220 is used to convert the low-grade heat of the low-temperature exhaust gas into high-grade heat. The waste heat recovery module 210 also uses the high-grade heat to perform the second heating on the input gas; the exhaust gas treatment system 3 is used to receive and treat at least part of the low-temperature exhaust gas.

[0055] It can be understood that the coating machine is divided into a positive electrode coating machine and a negative electrode coating machine. The positive electrode coating machine generates NMP exhaust gas, and the negative electrode coating machine generates high-temperature exhaust gas. The coating system of the present application can be used for both the positive electrode coating machine to treat the NMP exhaust gas and the negative electrode coating machine to treat the high-temperature exhaust gas.

[0056] In the embodiments of the present application, the coating system includes a coating oven system 1, a heat exchange recovery system 2 and an exhaust gas treatment system 3. The heat exchange recovery system 2 includes a waste heat recovery module 210 and a heat pump module 220. The waste heat recovery module 210 uses the high-temperature exhaust gas discharged from the coating oven system 1 to perform the first heating on the input gas flowing to the coating oven system 1 and converts the high-temperature exhaust gas into low-temperature exhaust gas. The heat pump module 220 is used to convert the low-grade heat of the low-temperature exhaust gas into high-grade heat. The waste heat recovery module 210 also uses the high-grade heat to perform the second heating on the input gas, fully utilizing the heat of the exhaust gas to heat the input gas entering the coating oven system 1, improving the heat recovery utilization rate of the coating system and reducing the overall operating energy consumption of the coating system.

[0057] In one embodiment, please refer to Figure 2 , Figure 6 , Figure 10 and Figure 14, the coating oven system 1 includes an oven body 110, a first exhaust fan 120, and a circulation fan 130. The oven body 110 has a first exhaust port 111, a second exhaust port 112, and an air inlet 113. The air inlet 113 is connected to both the second exhaust port 112 and the waste heat recovery module 210; the first exhaust fan 120 is used to convey the high-temperature waste gas discharged from the first exhaust port 111 to the waste heat recovery module 210; the circulation fan 130 is used to convey the gas discharged from the second exhaust port 112 and the input gas discharged from the waste heat recovery module 210 to the air inlet 113.

[0058] In one embodiment, please refer to Figure 2 , Figure 6 , Figure 10 and Figure 14 together. The coating oven system 1 further includes a plurality of first air valves 140 for controlling the air volume. First air valves 140 are provided between the circulation fan 130 and the second exhaust port 112, between the circulation fan 130 and the waste heat recovery module 210, and between the circulation fan 130 and the air inlet 113. The air volume returned to the oven body 110 is controlled by the first air valves 140.

[0059] In one embodiment, please refer to Figure 2 , Figure 6 , Figure 10 and Figure 14 together. The coating oven system 1 further includes a heater 150 for assisting in heating the input gas. The heater 150 is provided between the circulation fan 130 and the air inlet 113.

[0060] Furthermore, since the required return air temperature of each coating oven system 1 is different, the heaters 150 of each coating oven system 1 are all connected to a heat transfer oil system or a steam system to assist in heating the return air, so as to achieve the purpose of heating and temperature control.

[0061] In one embodiment, please refer to Figure 2 , Figure 6 , Figure 10 and Figure 14 together. A plurality of coating oven systems 1 are provided, and a plurality of coating oven systems 1 share a heat exchange and recovery system 2.

[0062] Among them, in Figure 2 , Figure 6 , Figure 10 and Figure 14 , the C port is connected to the return air duct of the subsequent coating oven system 1, and the D port is connected to the exhaust duct of the subsequent coating oven system 1.

[0063] In one embodiment, if a plurality of coating oven systems 1 share a heat exchange and recovery system 2, the waste heat recovery module 210 is arranged at a suitable position such as the side of the coating oven system 1.

[0064] Alternatively, if there are multiple coating oven systems 1, and if one coating oven system 1 uses one heat exchange recovery system 2, the waste heat recovery module 210 can be arranged above the coating oven system 1 to improve the space utilization rate.

[0065] According to another aspect of the present application, please also refer to Figures 1 to 16 , an embodiment of the present application further provides a heat exchange recovery system 2, which is used for recovering the heat of the high-temperature waste gas discharged from the coating oven system 1. The heat exchange recovery system 2 includes a waste heat recovery module 210 and a heat pump module 220. The waste heat recovery module 210 includes a gas-gas heat exchanger 211 and a high-temperature heat exchanger 212. The gas-gas heat exchanger 211 is connected to the first exhaust port 111 of the coating oven system 1. The gas-gas heat exchanger 211 uses the high-temperature waste gas discharged from the coating oven system 1 to perform the first heating on the input gas flowing to the high-temperature heat exchanger 212 and converts the high-temperature waste gas into low-temperature waste gas. The high-temperature heat exchanger 212 is connected to the air inlet 113 of the coating oven system 1. The high-temperature heat exchanger 212 is used for performing the second heating on the input gas; the heat pump module 220 is arranged between the gas-gas heat exchanger 211 and the high-temperature heat exchanger 212, and the heat pump module 220 is used for converting the low-grade heat of the low-temperature waste gas into the high-grade heat required by the high-temperature heat exchanger 212.

[0066] In one embodiment, please also refer to Figure 2 and Figure 3 , Figure 6 and Figure 7 , Figure 10 and Figure 11 as well as Figure 14 and Figure 15 , a circulation fan 130 is arranged between the air inlet 113 and the gas-gas heat exchanger 211. The high-temperature heat exchanger 212 is arranged between the gas-gas heat exchanger 211 and the circulation fan 130, or the high-temperature heat exchanger 212 is arranged between the circulation fan 130 and the air inlet 113. The position of the high-temperature heat exchanger 212 can be flexibly selected according to actual design requirements and is not uniquely limited herein.

[0067] It can be understood that when the high-temperature heat exchanger 212 is arranged between the circulation fan 130 and the air inlet 113, it can be regarded as the high-temperature heat exchanger 212 being installed in the oven body 110 of the coating oven system 1, which improves the integration degree of the system.

[0068] In one embodiment, please also refer to Figure 3 and Figure 4 , Figure 7 and Figure 8 , Figure 11 and Figure 12 as well as Figure 15 andFigure 16 , the heat pump module 220 includes a heat pump unit 221 and a circulation pump 222. The heat pump unit 221 includes a low-temperature refrigerant heat exchanger 2211, a high-temperature refrigerant heat exchanger 2212, a low-temperature compressor, a high-temperature compressor, etc. The low-temperature refrigerant heat exchanger 2211, the low-temperature compressor, and the high-temperature compressor convert the low-grade heat of the low-temperature exhaust gas into high-grade heat. A circulation flow path is formed between the high-temperature refrigerant heat exchanger 2212 and the high-temperature heat exchanger 212. The high-temperature refrigerant heat exchanger 2212 uses the high-grade heat to heat the liquid in the circulation flow path. The circulation pump 222 is used to drive the liquid to flow in the circulation flow path.

[0069] In one embodiment, please refer to Figure 4 , Figure 8 , Figure 12 and Figure 16 , the heat pump module 220 further includes a high-temperature buffer tank 223 for heat storage. The high-temperature buffer tank 223 is arranged between the inlet of the high-temperature refrigerant heat exchanger 2212 and the outlet of the high-temperature heat exchanger 212. The high-temperature buffer tank 223 can store heat for the hot water in the pipeline. The circulation pump 222 is arranged between the high-temperature buffer tank 223 and the high-temperature refrigerant heat exchanger 2212.

[0070] In one embodiment, please refer to Figure 4 , Figure 8 , Figure 12 and Figure 16 , multiple heat pump units 221 are provided. Multiple heat pump units 221 share a circulation pump 222 and a high-temperature buffer tank 223, saving energy and improving the integration of the device.

[0071] In one embodiment, please refer to Figure 4 and Figure 8 , the waste heat recovery module 210 further includes a low-temperature heat exchanger 215 arranged between the gas-gas heat exchanger 211 and the high-temperature heat exchanger 212. The gas-gas heat exchanger 211 converts the high-temperature exhaust gas into primary low-temperature exhaust gas. The low-temperature heat exchanger 215 converts the primary low-temperature exhaust gas into secondary low-temperature exhaust gas. The heat pump module 220 further includes a chiller 225 arranged between the low-temperature heat exchanger 215 and the heat pump unit 221. At this time, the low-temperature refrigerant heat exchanger 2211 serves as the evaporator of the heat pump unit 221, and absorbs low-grade heat to produce chilled water at about 7°C to supply to the chiller 225.

[0072] Among them, the chiller 225 can not only be used to balance the system energy, ensure the tail gas discharge temperature and concentration of the NMP exhaust gas, but also produce cold air to cool the coating oven system 1 when the coating oven system 1 stops.

[0073] In other embodiments, please refer to Figure 12 and Figure 16When the heat pump module 220 is not provided with a chiller 225, the low-temperature waste gas discharged from the air-to-air heat exchanger 211 is directly transmitted to the low-temperature refrigerant heat exchanger 2211. The low-temperature refrigerant heat exchanger 2211 serves as the evaporator of the heat pump unit 221, and the heat of the low-temperature waste gas discharged from the air-to-air heat exchanger 211 is recovered again.

[0074] In one embodiment, please refer to Figure 12 and Figure 16 When the heat pump module 220 is not provided with a chiller 225, the low-temperature refrigerant heat exchanger 2211 is an evaporator. The heat pump module 220 further includes a second air valve 224 disposed at the inlet of the low-temperature refrigerant heat exchanger 2211, and the second air valve 224 is used to control the air volume entering the low-temperature refrigerant heat exchanger 2211.

[0075] In one embodiment, the liquid in the circulation flow path is hot water.

[0076] In one embodiment, the high-temperature refrigerant heat exchanger 2212 heats the hot water in the circulation flow path to 130 °C.

[0077] In other embodiments, the liquid in the circulation flow path can also be heat-conducting oil, and the type of the liquid is selected according to actual needs and is not uniquely limited herein.

[0078] According to another aspect of the present application, please refer to Figures 1 to 16 The embodiment of the present application further provides a waste heat recovery module 210. The waste heat recovery module 210 includes an air-to-air heat exchanger 211, a second exhaust air fan 213, a return air fan 214, and a high-temperature heat exchanger 212. The inlet of the air-to-air heat exchanger 211 is connected to the first exhaust port 111 of the coating oven system 1. The air-to-air heat exchanger 211 has a first gas channel and a second gas channel. The high-temperature waste gas discharged from the coating oven system 1 passes through the first gas channel, and the input gas flowing to the air inlet 113 of the coating oven system 1 passes through the second gas channel. The high-temperature waste gas performs the first heating on the input gas and converts the high-temperature waste gas into low-temperature waste gas. The second exhaust air fan 213 is disposed between the air-to-air heat exchanger 211 and the first exhaust port 111. The return air fan 214 is disposed between the air-to-air heat exchanger 211 and the air inlet 113. The high-temperature heat exchanger 212 is disposed between the return air fan 214 and the air inlet 113, and the high-temperature heat exchanger 212 uses the heat of the low-temperature waste gas to perform the second heating on the input gas.

[0079] In one embodiment, please refer to Figure 3 , Figure 7 , Figure 11 and Figure 15 The input gas is low-temperature waste gas and / or fresh air from the external environment.

[0080] In one embodiment, please refer toFigure 3 and Figure 7 When the input gas is low-temperature waste gas, the outlet of the first gas channel is connected to the inlet of the second gas channel. The waste heat recovery module 210 further includes a low-temperature heat exchanger 215, and the low-temperature heat exchanger 215 is arranged between the outlet of the first gas channel and the inlet of the second gas channel.

[0081] In one embodiment, please refer to Figure 3 and Figure 7 together. The waste heat recovery module 210 further includes a demister 216. The demister 216 is arranged between the low-temperature heat exchanger 215 and the inlet of the second gas channel, and the demister 216 is used to intercept and collect NMP condensed droplets.

[0082] In one embodiment, please refer to Figure 3 and Figure 7 together. The gas-gas heat exchanger 211 converts high-temperature waste gas into primary low-temperature waste gas, the low-temperature heat exchanger 215 converts the primary low-temperature waste gas into secondary low-temperature waste gas, part of the secondary low-temperature waste gas is transported to the second gas channel, and the remaining secondary low-temperature waste gas is transported to the tail gas treatment system 3.

[0083] In one embodiment, 90%-95% of the secondary low-temperature waste gas is transported to the waste heat recovery module 210, and 5%-10% of the secondary low-temperature waste gas is transported to the tail gas treatment system 3.

[0084] In one embodiment, the temperature of the primary low-temperature waste gas is 30°C - 40°C, and the temperature of the secondary low-temperature waste gas is 15°C - 18°C.

[0085] In one embodiment, please refer to Figure 11 and Figure 15 together. When the input gas is fresh air from the external environment, a primary and secondary filter 217 is arranged at the inlet of the second gas channel. The primary and secondary filter 217 is mainly used to filter particulate dust and various suspended matters in the fresh air to improve the quality of the gas entering the coating oven system 1.

[0086] In summary, in the embodiments of the present application, the coating system includes the heat exchange recovery system 2. The heat exchange recovery system 2 includes the waste heat recovery module 210. The waste heat recovery module 210 includes the air-air heat exchanger 211, the second exhaust air fan 213, the return air fan 214, and the high-temperature heat exchanger 212. The high-temperature waste gas in the first gas passage of the air-air heat exchanger 211 heats the input gas in the second gas passage for the first time and converts the high-temperature waste gas into low-temperature waste gas. The high-temperature heat exchanger 212 uses the heat of the low-temperature waste gas to heat the input gas for the second time. The waste heat recovery module 210 of the present application makes full use of the heat of the high-temperature waste gas to heat the input gas entering the coating oven system 1, improves the heat recovery utilization rate of the waste heat recovery module 210, and reduces the overall operating energy consumption of the waste heat recovery module 210, the heat exchange recovery system 2, and the coating system.

[0087] In the first embodiment of the present application, please refer to Figures 1 to 4 together. The coating system of this embodiment is applied to a positive electrode coater. In this embodiment, the input gas flowing to the coating oven system 1 is the recycled low-temperature waste gas. The high-temperature heat exchanger 212 of the waste heat recovery module 210 is arranged between the air-air heat exchanger 211 and the circulation fan 130. A chiller 225 is provided in the heat pump module 220 to supply cold water to the air-air heat exchanger 211 and the tail gas treatment system 3.

[0088] In this embodiment, Figure 2 The A port in Figure 3 is connected to the A port in Figure 2 to return the low-temperature waste gas processed by the air-air heat exchanger 211 to the coating oven system 1; Figure 3 The B port in Figure 2 is connected to the B port in Figure 2 to transport the high-temperature waste gas discharged from the coating oven system 1 to the air-air heat exchanger 211; Figure 3 The C port in Figure 4 is used to connect to the return air duct of the subsequent coating oven system 1, Figure 3 The D port in Figure 4 is used to connect to the exhaust air duct of the subsequent coating oven system 1; Figure 3 The E port in Figure 4 is connected to the E port in Figure 3 to transport the cold water whose temperature has risen after being used by the air-air heat exchanger 211 and the tail gas treatment system 3 to the low-temperature refrigerant heat exchanger 2211 for re-cooling; Figure 4The H port in it is used to transport the hot water whose temperature has decreased after the high-temperature heat exchanger 212 is used to the high-temperature buffer tank 223 of the heat pump module 220 for storage; Figure 3 The I port in it is connected to the NMP waste liquid temporary storage tank to transport the NMP waste liquid generated by the demister 216 and the tail gas treatment system 3 to the NMP waste liquid temporary storage tank; Figure 3 The J port in it is connected to the external environment to emit the environmentally friendly tail gas after being treated by the tail gas treatment system 3 at a high altitude.

[0089] In the second embodiment of the present application, please refer to Figures 5 to 8 together. The coating system of this embodiment is applied to a positive electrode coater. In this embodiment, the input gas flowing to the coating oven system 1 uses the refluxed low-temperature waste gas. The high-temperature heat exchanger 212 of the waste heat recovery module 210 is arranged between the circulation fan 130 and the heater 150. A chiller 225 is arranged in the heat pump module 220 to provide cold water for the gas-gas heat exchanger 211 and the tail gas treatment system 3.

[0090] In this embodiment, Figure 6 The A port in it is connected to Figure 7 the A port in it to reflux the low-temperature waste gas after being treated by the gas-gas heat exchanger 211 to the coating oven system 1; Figure 6 The B port in it is connected to Figure 3 the B port in it to transport the high-temperature waste gas discharged from the coating oven system 1 to the gas-gas heat exchanger 211; Figure 6 The C port in it is used to connect to the return air duct of the subsequent coating oven system 1, Figure 6 The D port in it is used to connect to the exhaust air duct of the subsequent coating oven system 1, Figure 6 The E port in it is used to connect to the water outlet of the subsequent high-temperature heat exchanger 212, Figure 6 The F port in it is used to connect to the water inlet of the subsequent high-temperature heat exchanger 212; Figure 6 The G port in it is connected to Figure 8 the G port in it to transport the hot water whose temperature has decreased after the high-temperature heat exchanger 212 is used to the high-temperature buffer tank 223 of the heat pump module 220 for storage; Figure 6 The H port in it is connected to Figure 8 the H port in it to transport the 130°C hot water prepared by the high-temperature refrigerant heat exchanger 2212 to the high-temperature heat exchanger 212; Figure 7 The I port in it is connected to Figure 8 the I port in it to transport the cold water whose temperature has risen after the gas-gas heat exchanger 211 and the tail gas treatment system 3 are used to the low-temperature refrigerant heat exchanger 2211 to be cooled again; Figure 7 The J port in it is connected to Figure 8 the J port in it to transport the cold water of about 7°C prepared by the low-temperature refrigerant heat exchanger 2211 to the gas-gas heat exchanger 211 and the tail gas treatment system 3 for use, Figure 7The K port in it is connected to the NMP waste liquid temporary storage tank to transport the NMP waste liquid generated by the demister 216 and the tail gas treatment system 3 to the NMP waste liquid temporary storage tank; Figure 7 The L port in it is connected to the external environment to discharge the environmentally friendly tail gas after being treated by the tail gas treatment system 3 at a high altitude.

[0091] In the third embodiment of the present application, please refer to Figures 9 to 12 , the coating system of this embodiment is applied to the negative electrode coater. In this embodiment, the input gas flowing to the coating oven system 1 adopts fresh air. The high-temperature heat exchanger 212 of the waste heat recovery module 210 is arranged between the gas-gas heat exchanger 211 and the circulation fan 130. The low-temperature waste gas discharged from the gas-gas heat exchanger 211 is directly transported to the low-temperature refrigerant heat exchanger 2211 of the heat pump module 220 for secondary heat recovery.

[0092] In this embodiment, Figure 10 The A port of Figure 11 is connected to the A port in Figure 10 to transport the fresh air treated by the gas-gas heat exchanger 211 to the coating oven system 1; Figure 11 The B port in Figure 10 is connected to the B port in Figure 10 to transport the high-temperature waste gas discharged from the coating oven system 1 to the gas-gas heat exchanger 211; Figure 11 The C port in Figure 12 is used to connect the return air duct of the subsequent coating oven system 1, Figure 11 The D port in Figure 12 is used to connect the exhaust duct of the subsequent coating oven system 1; Figure 10 The E port in Figure 12 is connected to the E port in

[0093] In the fourth embodiment of the present application, please refer to Figures 13 to 16 , the coating system of this embodiment is applied to the negative electrode coater. In this embodiment, the input gas flowing to the coating oven system 1 adopts fresh air. The high-temperature heat exchanger 212 of the waste heat recovery module 210 is arranged between the circulation fan 130 and the heater 150. The low-temperature waste gas discharged from the gas-gas heat exchanger 211 is directly transported to the low-temperature refrigerant heat exchanger 2211 of the heat pump module 220 for secondary heat recovery.

[0094] In this embodiment, Figure 14 The A port ofFigure 15 The A port in it is used to convey the fresh air processed by the air-air heat exchanger 211 to the coating oven system 1; Figure 14 The B port in it is connected to Figure 15 The B port in it is used to convey the high-temperature waste gas discharged from the coating oven system 1 to the air-air heat exchanger 211; Figure 14 The C port in it is used to connect to the return air duct of the subsequent coating oven system 1, Figure 14 The D port in it is used to connect to the exhaust air duct of the subsequent coating oven system 1, Figure 14 The E port in it is used to connect to the water outlet of the subsequent high-temperature heat exchanger 212, Figure 14 The F port in it is used to connect to the water inlet of the subsequent high-temperature heat exchanger 212; Figure 14 The G port in it is connected to Figure 16 The G port in it is used to convey the hot water with a slightly decreased temperature after being used by the high-temperature heat exchanger 212 to the high-temperature storage tank 223 of the heat pump module 220 for storage; Figure 14 The H port in it is connected to Figure 16 The H port in it is used to convey the hot water at 130°C prepared by the high-temperature refrigerant heat exchanger 2212 to the high-temperature heat exchanger 212; Figure 15 The I port in it is connected to Figure 16 The I port in it is used to convey the low-temperature waste gas discharged from the air-air heat exchanger 211 to the low-temperature refrigerant heat exchanger 2211 of the heat pump module 220 for secondary heat recovery.

[0095] Optionally, generally, the waste gas discharged from the negative electrode coater is mainly water vapor, and the harmful substances contained can be ignored or even contain no harmful substances. In this case, the coating system can not set up the tail gas treatment system 3 to achieve the purpose of cost reduction; when the waste gas discharged from the negative electrode coater contains more harmful substances, the coating system at this time needs to set up the tail gas treatment system 3 to purify the waste gas to ensure that the waste gas will not pollute the environment.

[0096] Exemplarily, please refer to Figure 9 and Figure 13 , the coating system applied to the negative electrode coater in the embodiment of the present application is provided with the tail gas treatment system 3.

[0097] Therefore, Figure 12 The low-temperature waste gas after being processed by the low-temperature refrigerant heat exchanger 2211 in it is conveyed to the tail gas treatment system 3 for treatment, Figure 16 The low-temperature waste gas after being processed by the low-temperature refrigerant heat exchanger 2211 in it is conveyed to the tail gas treatment system 3 for treatment.

[0098] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0099] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A coating system, characterized in that: include: Coating oven system; a heat exchange recovery system, comprising a waste heat recovery module and a heat pump module, wherein the waste heat recovery module utilizes the high-temperature exhaust gas discharged from the coating oven system to perform a first heating of the input gas flowing to the coating oven system and converts the high-temperature exhaust gas into low-temperature exhaust gas, the heat pump module is used to convert the low-grade heat of the low-temperature exhaust gas into high-grade heat, and the waste heat recovery module also utilizes the high-grade heat to perform a second heating of the input gas; and The tail gas treatment system is used to receive and treat at least part of the low-temperature exhaust gas.

2. The coating system according to claim 1, characterized in that: The coating oven system comprises: The oven body has a first exhaust port, a second exhaust port and an air inlet, wherein the air inlet is connected to the second exhaust port and the waste heat recovery module at the same time; a first exhaust fan, configured to transport the high-temperature exhaust gas discharged from the first exhaust port to the waste heat recovery module; and A circulation fan is used to transport the gas exhausted from the second exhaust port and the input gas exhausted from the waste heat recovery module to the air inlet.

3. The coating system according to claim 2, characterized in that: The coating oven system further includes a plurality of first air valves for controlling air volume, and the first air valves are arranged between the circulation fan and the second exhaust port, between the circulation fan and the waste heat recovery module, and between the circulation fan and the air inlet.

4. The coating system according to claim 2, characterized in that: The coating oven system further includes a heater for auxiliary heating of the input gas, wherein the heater is disposed between the circulation fan and the air inlet.

5. The coating system according to claim 1, characterized in that: The coating oven systems are provided in plurality, and the plurality of coating oven systems share one heat exchange recovery system.

6. The coating system according to any one of claims 1 to 5, characterized in that: The waste heat recovery module comprises: An air-to-air heat exchanger, whose inlet is connected to the first exhaust port of the coating oven system, the air-to-air heat exchanger has a first gas channel and a second gas channel, the high-temperature exhaust gas discharged from the coating oven system passes through the first gas channel, and the input gas flowing to the air inlet of the coating oven system passes through the second gas channel, the high-temperature exhaust gas heats the input gas for the first time and converts the high-temperature exhaust gas into low-temperature exhaust gas; a second exhaust fan, disposed between the air-to-air heat exchanger and the first exhaust port; a return air fan, disposed between the air-to-air heat exchanger and the air inlet; and A high temperature heat exchanger is arranged between the return air fan and the air inlet, and the high temperature heat exchanger utilizes the heat of the low temperature exhaust gas to perform a second heating on the input gas.

7. The coating system according to claim 6, characterized in that: The input gas is the low-temperature exhaust gas and / or fresh air from the external environment.

8. The coating system according to claim 6, characterized in that: The heat pump module comprises: A heat pump unit, comprising a low-temperature refrigerant heat exchanger, a high-temperature refrigerant heat exchanger, a low-temperature compressor and a high-temperature compressor, wherein the low-temperature refrigerant heat exchanger, the low-temperature compressor and the high-temperature compressor convert low-grade heat of low-temperature exhaust gas into high-grade heat, a circulation flow path is formed between the high-temperature refrigerant heat exchanger and the high-temperature heat exchanger, and the high-temperature refrigerant heat exchanger uses the high-grade heat to heat liquid in the circulation flow path; and A circulation pump is used to drive the liquid to flow in the circulation flow path.

9. The coating system according to claim 8, characterized in that: The heat pump module also includes a high-temperature cache tank for heat storage, which is arranged between the inlet of the high-temperature refrigerant heat exchanger and the outlet of the high-temperature heat exchanger, and the circulating pump is arranged between the high-temperature cache tank and the high-temperature refrigerant heat exchanger.

10. The coating system according to claim 8, characterized in that: The heat pump units are provided in plurality, and the plurality of heat pump units share one circulation pump and one high-temperature cache tank.

Images