Heat exchange recovery system and coating system

Abstract

The utility model relates to a heat exchange recovery system and a coating system, and belongs to the technical field of waste gas recovery, the heat exchange recovery system comprises a waste heat recovery module and a heat pump module, and the waste heat recovery module comprises a gas-gas heat exchanger and a high-temperature heat exchanger; the gas-gas heat exchanger conducts primary heating on input gas flowing to the high-temperature heat exchanger through high-temperature waste gas exhausted by the coating oven system and converts the high-temperature waste gas into low-temperature waste gas, the heat pump module is used for converting low-grade heat of the low-temperature waste gas into high-grade heat, and the high-temperature heat exchanger conducts secondary heating on the input gas. According to the heat exchange recovery system and the coating system provided by the invention, the heat exchange recovery system fully utilizes the heat of the high-temperature waste gas to heat the input gas entering the coating oven system, so that the heat recovery utilization rate of the heat exchange recovery system is improved, and the overall operation energy consumption of the heat exchange recovery system and the coating system is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of waste gas recovery, and in particular to a heat exchange recovery system and 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. Direct discharge of waste gas into the atmosphere will pollute the atmospheric environment, and usually requires the use of waste heat recovery systems for recovery and treatment. In traditional systems, the waste gas discharged by the coating machine needs to be cooled before the next step of treatment, while the gas entering the coating machine needs to be heated before entering the coating machine. The operating energy consumption of this system is often relatively high. Utility Model Content

[0003] Based on this, it is necessary to provide a heat exchange recovery system and 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 this end, according to one aspect of the present application, a heat exchange recovery system is provided, which is used to recover heat from high-temperature exhaust gas discharged from a coating oven system, and the heat exchange recovery system includes:

[0005] a waste heat recovery module, comprising an air-to-air heat exchanger and a high-temperature heat exchanger, the air-to-air heat exchanger being connected to a first exhaust port of the coating oven system, the air-to-air heat exchanger utilizing the high-temperature exhaust gas discharged from the coating oven system to perform a first heating of the input gas flowing to the high-temperature heat exchanger, and converting the high-temperature exhaust gas into a low-temperature exhaust gas, the high-temperature heat exchanger being connected to an air inlet of the coating oven system, and the high-temperature heat exchanger being used to perform a second heating of the input gas; and

[0006] The heat pump module is arranged between the gas-to-gas heat exchanger and the high-temperature heat exchanger. The heat pump module is used to convert the low-grade heat of the low-temperature exhaust gas into the high-grade heat required by the high-temperature heat exchanger.

[0007] Optionally, a circulation fan is arranged between the air inlet and the air-to-air heat exchanger, the high-temperature heat exchanger is arranged between the air-to-air heat exchanger and the circulation fan, or the high-temperature heat exchanger is arranged between the circulation fan and the air inlet.

[0008] Optionally, the heat pump module comprises:

[0009] A heat pump unit, including 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

[0010] A circulation pump is used to drive liquid to flow in a circulation path.

[0011] Optionally, the heat pump module also includes a high-temperature cache tank for heat storage, the high-temperature cache tank 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.

[0012] Optionally, multiple heat pump units are provided, and the multiple heat pump units share a circulation pump and a high-temperature cache tank.

[0013] Optionally, the low-temperature refrigerant heat exchanger is an evaporator, and the heat pump module further includes a second air valve arranged at the inlet of the low-temperature refrigerant heat exchanger, and the second air valve is used to control the air volume entering the low-temperature refrigerant heat exchanger.

[0014] Optionally, the waste heat recovery module also includes a low-temperature heat exchanger arranged between the gas-to-gas heat exchanger and the high-temperature heat exchanger, the gas-to-gas heat exchanger converts the high-temperature exhaust gas into a first-level low-temperature exhaust gas, and the low-temperature heat exchanger converts the first-level low-temperature exhaust gas into a second-level low-temperature exhaust gas. The heat pump module also includes a chiller arranged between the low-temperature heat exchanger and the heat pump unit.

[0015] Optionally, the liquid in the circulation flow path is heat transfer oil.

[0016] Optionally, the high-temperature refrigerant heat exchanger heats the heat transfer oil in the circulation flow path to 130°C.

[0017] According to another aspect of the present application, a coating system is provided, which includes the heat exchange recovery system as described above.

[0018] The beneficial effects of the heat recovery system and coating system provided by the present application are as follows: compared with the prior art, the heat recovery system of the present application includes a waste heat recovery module and a heat pump module, the waste heat recovery module includes an air-to-air heat exchanger and a high-temperature heat exchanger, the air-to-air heat exchanger utilizes the high-temperature exhaust gas discharged from the coating oven system to perform a first heating of the input gas flowing to the high-temperature heat exchanger, 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 high-temperature heat exchanger heats the input gas for a second time, the heat recovery system of the present application fully utilizes the heat of the high-temperature exhaust gas to heat the input gas entering the coating oven system, thereby improving the heat recovery utilization rate of the heat recovery system and reducing the overall operating energy consumption of the heat recovery system and the coating system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the structure of a coating system provided in the first embodiment of the present application;

[0021] Figure 2 A schematic structural diagram of a coating oven system of a coating system provided in the first embodiment of the present application;

[0022] Figure 3 A schematic diagram of the structure of a waste heat recovery module of a coating system provided in the first embodiment of the present application;

[0023] Figure 4 A schematic diagram of the structure of a heat pump module of a coating system provided in the first embodiment of the present application;

[0024] Figure 5 A schematic diagram of the structure of a coating system provided in a second embodiment of the present application;

[0025] Figure 6 A schematic structural diagram of a coating oven system of a coating system provided in a second embodiment of the present application;

[0026] Figure 7 A schematic structural diagram of a waste heat recovery module of a coating system provided in a second embodiment of the present application;

[0027] Figure 8 A schematic structural diagram of a heat pump module of a coating system provided in a second embodiment of the present application;

[0028] Fig. 9 A schematic structural diagram of a coating system provided in a third embodiment of the present application;

[0029] Fig.10 A schematic structural diagram of a coating oven system of a coating system provided in a third embodiment of the present application;

[0030] Fig.11 A schematic diagram of the structure of a waste heat recovery module of a coating system provided in a third embodiment of the present application;

[0031] Fig.12 A schematic structural diagram of a heat pump module of a coating system provided in a third embodiment of the present application;

[0032] Fig.13A schematic structural diagram of a coating system provided in a fourth embodiment of the present application;

[0033] Fig.14 A schematic structural diagram of a coating oven system of a coating system provided in a fourth embodiment of the present application;

[0034] Fig.15 A schematic structural diagram of a waste heat recovery module of a coating system provided in a fourth embodiment of the present application;

[0035] Fig.16 A schematic structural diagram of a heat pump module of a coating system provided in the fourth embodiment of the present application.

[0036] Description of reference numerals:

[0037] 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;

[0038] 2. Heat exchange recovery system; 210. Waste heat recovery module; 211. Air-to-air heat exchanger; 212. High-temperature heat exchanger; 213. Second exhaust fan; 214. Return fan; 215. Low-temperature heat exchanger; 216. Demister; 217. Primary and secondary filter; 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; 226. Chiller circulation pump;

[0039] 3. Exhaust gas treatment system. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full 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 violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0041] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0043] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0045] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0046] According to one aspect of the present application, an embodiment of the present application provides 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 of 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 heat the input gas for a second time; the exhaust gas treatment system 3 is used to receive and process at least part of the low-temperature exhaust gas.

[0047] It is understandable that the coating machine is divided into a positive electrode coating machine and a negative electrode coating machine, the positive electrode coating machine produces NMP waste gas, and the negative electrode coating machine produces high-temperature waste gas. The coating system of the present application can be used for both the positive electrode coating machine to treat the NMP waste gas and the negative electrode coating machine to treat the high-temperature waste gas.

[0048] In an embodiment 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 a first heating of the input gas flowing to the coating oven system 1, and converts the high-temperature exhaust gas into a 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 heat the input gas for a second time, and fully utilizes the heat of the exhaust gas to heat the input gas entering the coating oven system 1, thereby improving the heat recovery utilization rate of the coating system and reducing the overall operating energy consumption of the coating system.

[0049] In one embodiment, please refer to Figure 2 , Figure 6 , Fig.10 and Fig.14The coating oven system 1 includes an oven body 110, a first exhaust fan 120 and a circulating 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 the second exhaust port 112 and the waste heat recovery module 210 at the same time; the first exhaust fan 120 is used to transport the high-temperature exhaust gas discharged from the first exhaust port 111 to the waste heat recovery module 210; the circulating fan 130 is used to transport 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.

[0050] In one embodiment, please refer to Figure 2 , Figure 6 , Fig.10 and Fig.14 The coating oven system 1 also includes a plurality of first air valves 140 for controlling the air volume. First air valves 140 are arranged between the circulating fan 130 and the second exhaust port 112, between the circulating fan 130 and the waste heat recovery module 210, and between the circulating fan 130 and the air inlet 113. The air volume returning to the oven body 110 is controlled by the first air valves 140.

[0051] In one embodiment, please refer to Figure 2 , Figure 6 , Fig.10 and Fig.14 The coating oven system 1 further includes a heater 150 for auxiliary heating of input gas, and the heater 150 is disposed between the circulation fan 130 and the air inlet 113 .

[0052] Furthermore, since the return air temperature requirements of each coating oven system 1 are different, the heater 150 of each coating oven system 1 is connected to a thermal oil system or a steam system to perform auxiliary heating on the return air to achieve the purpose of heating and temperature control.

[0053] In one embodiment, please refer to Figure 2 , Figure 6 , Fig.10 and Fig.14 The coating oven system 1 is provided with multiple coating oven systems 1 , and the multiple coating oven systems 1 share one heat exchange recovery system 2 .

[0054] Among them, Figure 2 , Figure 6 , Fig.10 and Fig.14 In the embodiment, the C ports are connected to the return air duct of the subsequent coating oven system 1, and the D ports are connected to the exhaust air duct of the subsequent coating oven system 1.

[0055] In one embodiment, if a plurality of coating oven systems 1 share one heat exchange recovery system 2 , the waste heat recovery module 210 is disposed at a suitable position such as a side of the coating oven system 1 .

[0056] Alternatively, a plurality of coating oven systems 1 are provided. If one coating oven system 1 uses one heat exchange recovery system 2, the waste heat recovery module 210 can be provided above the coating oven system 1 to improve space utilization.

[0057] According to another aspect of this application, please also refer to Figures 1 to 16 The embodiment of the present application further provides a heat exchange recovery system 2, which is used to recover heat from the high-temperature exhaust 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 an air-to-air heat exchanger 211 and a high-temperature heat exchanger 212. 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 uses the high-temperature exhaust gas discharged from the coating oven system 1 to recover heat from the high-temperature exhaust gas discharged from the coating oven system 1. The warm exhaust gas heats the input gas flowing to the high-temperature heat exchanger 212 for the first time and converts the high-temperature exhaust gas into low-temperature exhaust gas. The high-temperature heat exchanger 212 is connected to the air inlet 113 of the coating oven system 1, and the high-temperature heat exchanger 212 is used to heat the input gas for the second time; the heat pump module 220 is arranged between the air-to-air heat exchanger 211 and the high-temperature heat exchanger 212, and the heat pump module 220 is used to convert the low-grade heat of the low-temperature exhaust gas into the high-grade heat required by the high-temperature heat exchanger 212.

[0058] In one embodiment, please refer to Figure 2 and Figure 3 , Figure 6 and Figure 7 , Fig.10 and Fig.11 as well as Fig.14 and Fig.15 A circulating fan 130 is arranged between the air inlet 113 and the air-to-air heat exchanger 211, and a high-temperature heat exchanger 212 is arranged between the air-to-air heat exchanger 211 and the circulating fan 130, or the high-temperature heat exchanger 212 is arranged between the circulating fan 130 and the air inlet 113. The position of the high-temperature heat exchanger 212 is flexibly selected according to actual design requirements and is not limited here.

[0059] It is understandable that when the high temperature heat exchanger 212 is disposed between the circulation fan 130 and the air inlet 113, it can be considered that the high temperature heat exchanger 212 is installed in the oven body 110 of the coating oven system 1, thereby improving the system integration.

[0060] In one embodiment, please refer to Figure 3 and Figure 4 , Figure 7 and Figure 8 , Fig.11 and Fig.12 as well as Fig.15 and Fig.16 The heat pump module 220 includes a heat pump unit 221 and a circulating 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 and 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 circulating 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 circulating flow path. The circulating pump 222 is used to drive the liquid to flow in the circulating flow path.

[0061] In one embodiment, please refer to Figure 4 , Figure 8 , Fig.12 and Fig.16 The heat pump module 220 also includes a high-temperature cache tank 223 for heat storage. The high-temperature cache 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 cache tank 223 can store heat for hot water in the pipeline. The circulating pump 222 is arranged between the high-temperature cache tank 223 and the high-temperature refrigerant heat exchanger 2212.

[0062] In one embodiment, please refer to Figure 4 , Figure 8 , Fig.12 and Fig.16 The heat pump units 221 are provided with multiple ones, and the multiple heat pump units 221 share a circulation pump 222 and a high-temperature buffer tank 223, which saves energy and improves the integration of the device.

[0063] In one embodiment, please refer to Figure 4 and Figure 8 The waste heat recovery module 210 also includes a low-temperature heat exchanger 215 arranged between the gas-to-gas heat exchanger 211 and the high-temperature heat exchanger 212. The gas-to-gas heat exchanger 211 converts the high-temperature exhaust gas into a first-level low-temperature exhaust gas, and the low-temperature heat exchanger 215 converts the first-level low-temperature exhaust gas into a second-level low-temperature exhaust gas. The heat pump module 220 also 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 an evaporator of the heat pump unit 221, and produces chilled water at about 7°C by absorbing low-grade heat to provide it to the chiller 225.

[0064] The chiller 225 can not only be used to balance the system energy and ensure the tail exhaust temperature and concentration of the NMP waste gas, but also can produce cold air to cool the coating oven system 1 when the coating oven system 1 is shut down.

[0065] For other embodiments, please refer to Fig.12 and Fig.16When the heat pump module 220 is not provided with a chiller 225, the low-temperature exhaust gas discharged by the gas-to-gas heat exchanger 211 is directly transmitted to the low-temperature refrigerant heat exchanger 2211. The low-temperature refrigerant heat exchanger 2211 serves as an evaporator of the heat pump unit 221 to recover the heat of the low-temperature exhaust gas discharged by the gas-to-gas heat exchanger 211.

[0066] In one embodiment, please refer to Fig.12 and Fig.16 When the heat pump module 220 is not provided with a chiller 225, the low-temperature refrigerant heat exchanger 2211 is an evaporator, and the heat pump module 220 also includes a second air valve 224 arranged 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.

[0067] In one embodiment, the liquid in the circulation circuit is hot water.

[0068] In one embodiment, the high temperature refrigerant heat exchanger 2212 heats the hot water in the circulation circuit to 130°C.

[0069] In other embodiments, the liquid in the circulation flow path may also be heat transfer oil. The type of liquid is selected according to actual needs and is not limited here.

[0070] According to another aspect of this application, please also refer to Figures 1 to 16 The embodiment of the present application further provides a waste heat recovery module 210, which includes an air-to-air heat exchanger 211, a second exhaust 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 exhaust gas discharged from the coating oven system 1 flows to the air inlet 111 of the coating oven system 1 through the first gas channel. The input gas of 3 passes through the second gas channel, and 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; the second exhaust fan 213 is arranged between the air-to-air heat exchanger 211 and the first exhaust port 111; the return air fan 214 is arranged between the air-to-air heat exchanger 211 and the air inlet 113; the high-temperature heat exchanger 212 is arranged 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 exhaust gas to heat the input gas for the second time.

[0071] In one embodiment, please refer to Figure 3 , Figure 7 , Fig.11 and Fig.15 The input gas is low-temperature exhaust gas and / or fresh air from the external environment.

[0072] In one embodiment, please refer to Figure 3 and Figure 7 When the input gas is low-temperature exhaust gas, the outlet of the first gas channel is connected to the inlet of the second gas channel, and the waste heat recovery module 210 also includes a low-temperature heat exchanger 215, which is arranged between the outlet of the first gas channel and the inlet of the second gas channel.

[0073] In one embodiment, please refer to Figure 3 and Figure 7 The waste heat recovery module 210 further includes a demister 216, which is disposed between the low-temperature heat exchanger 215 and the inlet of the second gas channel. The demister 216 is used to intercept and collect small condensed droplets of NMP.

[0074] In one embodiment, please refer to Figure 3 and Figure 7 The gas-to-gas heat exchanger 211 converts the high-temperature exhaust gas into a first-level low-temperature exhaust gas, and the low-temperature heat exchanger 215 converts the first-level low-temperature exhaust gas into a second-level low-temperature exhaust gas. Part of the second-level low-temperature exhaust gas is transported to the second gas channel, and the remaining second-level low-temperature exhaust gas is transported to the exhaust gas treatment system 3.

[0075] In one embodiment, 90%-95% of the secondary low-temperature exhaust gas is delivered to the waste heat recovery module 210 , and 5%-10% of the secondary low-temperature exhaust gas is delivered to the tail gas treatment system 3 .

[0076] In one embodiment, the temperature of the primary low-temperature exhaust gas is 30°C-40°C, and the temperature of the secondary low-temperature exhaust gas is 15°C-18°C.

[0077] In one embodiment, please refer to Fig.11 and Fig.15 When the input gas is fresh air from the external environment, a primary and secondary efficiency filter 217 is provided at the entrance of the second gas channel. The primary and secondary efficiency filter 217 is mainly used to filter particulate dust and various suspended matter in the fresh air to improve the quality of the gas entering the coating oven system 1.

[0078] In summary, in the embodiment of the present application, the coating system includes the heat recovery system 2, the heat recovery system 2 includes the waste heat recovery module 210, the waste heat recovery module 210 includes an air-to-air heat exchanger 211, a second exhaust fan 213, a return air fan 214 and a high-temperature heat exchanger 212. The high-temperature exhaust gas of the first gas channel of the air-to-air heat exchanger 211 heats the input gas of the second gas channel for the first time, and converts the high-temperature exhaust gas into low-temperature exhaust gas. The high-temperature heat exchanger 212 uses the heat of the low-temperature exhaust gas to heat the input gas for the second time. The waste heat recovery module 210 of the present application fully utilizes the heat of the high-temperature exhaust gas to heat the input gas entering the coating oven system 1, thereby improving the heat recovery utilization rate of the waste heat recovery module 210 and reducing the overall operating energy consumption of the waste heat recovery module 210, the heat recovery system 2 and the coating system.

[0079] In the first embodiment of this application, please refer to Figures 1 to 4 In this embodiment, the input gas flowing to the coating oven system 1 adopts the reflux low-temperature exhaust gas, the high-temperature heat exchanger 212 of the waste heat recovery module 210 is arranged between the gas-to-gas heat exchanger 211 and the circulating fan 130, and the heat pump module 220 is provided with a chiller 225 to provide cold water for the gas-to-gas heat exchanger 211 and the exhaust gas treatment system 3.

[0080] In this embodiment, Figure 2 A port connection Figure 3 A port in the coating oven system 1 is used to return the low-temperature exhaust gas treated by the gas-to-gas heat exchanger 211 to the coating oven system 1; Figure 2 Port B connection Figure 3 Port B in the coating oven system 1 is used to transport the high-temperature exhaust gas discharged from the coating oven system 1 to the gas-to-gas heat exchanger 211; Figure 2 Port C in the coating oven system is used to connect the return air duct of the subsequent coating oven system 1. Figure 2 The D port is used to connect the exhaust duct of the subsequent coating oven system 1; Figure 3 E port connection Figure 4 The E port in the middle is used to transport the cold water whose temperature has risen after being used in the gas-to-gas heat exchanger 211 and the tail gas treatment system 3 to the low-temperature refrigerant heat exchanger 2211 for re-cooling; Figure 3 F port connection Figure 4 The F port in the middle is used to transport the cold water at about 7°C prepared by the low-temperature refrigerant heat exchanger 2211 to the gas-to-gas heat exchanger 211 and the exhaust gas treatment system 3 for use; Figure 3 G port connection Figure 4 The G port in the high temperature refrigerant heat exchanger 2212 is used to transport the 130°C hot water prepared by the high temperature refrigerant heat exchanger 2212 to the high temperature heat exchanger 212; Figure 3 H port connection Figure 4The H port in the heat exchanger 212 is used to transport the hot water whose temperature has dropped after use to the high-temperature cache tank 223 of the heat pump module 220 for storage; Figure 3 Port I in the NMP waste liquid temporary storage tank is connected 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 the exhaust gas treatment system is connected to the external environment so as to discharge the environmentally friendly exhaust gas treated by the exhaust gas treatment system 3 into the air.

[0081] In the second embodiment of this application, please refer to Figures 5 to 8 In this embodiment, the input gas flowing to the coating oven system 1 adopts the reflux low-temperature exhaust gas, the high-temperature heat exchanger 212 of the waste heat recovery module 210 is arranged between the circulating fan 130 and the heater 150, and the heat pump module 220 is provided with a chiller 225 to provide cold water for the gas-to-gas heat exchanger 211 and the exhaust gas treatment system 3.

[0082] In this embodiment, Figure 6 A port connection Figure 7 A port in the coating oven system 1 is used to return the low-temperature exhaust gas treated by the gas-to-gas heat exchanger 211 to the coating oven system 1; Figure 6 Port B connection Figure 3 Port B in the coating oven system 1 is used to transport the high-temperature exhaust gas discharged from the coating oven system 1 to the gas-to-gas heat exchanger 211; Figure 6 Port C in the coating oven system is used to connect the return air duct of the subsequent coating oven system 1. Figure 6 Port D in the coating oven system is used to connect the exhaust duct of the subsequent coating oven system 1. Figure 6 The E port in the middle is used to connect the water outlet of the subsequent high-temperature heat exchanger 212. Figure 6 The F port in the middle is used to connect the water inlet of the subsequent high-temperature heat exchanger 212; Figure 6 G port connection Figure 8 The G port in the heat exchanger 212 is used to transport the hot water whose temperature has dropped after use to the high-temperature cache tank 223 of the heat pump module 220 for storage; Figure 6 H port connection Figure 8 The H port in the high temperature refrigerant heat exchanger 2212 is used 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 I port connection Figure 8 Port I in the middle is used to transport the cold water whose temperature has risen after being used in the gas-to-gas heat exchanger 211 and the tail gas treatment system 3 to the low-temperature refrigerant heat exchanger 2211 for re-cooling; Figure 7 J port connection Figure 8 The J port in the middle is used to transport the cold water of about 7°C prepared by the low-temperature refrigerant heat exchanger 2211 to the gas-to-gas heat exchanger 211 and the exhaust gas treatment system 3 for use. Figure 7The K port in the middle 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 the exhaust gas treatment system is connected to the external environment so as to discharge the environmentally friendly exhaust gas treated by the exhaust gas treatment system 3 to high altitude.

[0083] In the third embodiment of this application, please refer to Figures 9 to 12 In this embodiment, the input gas flowing to the coating oven system 1 adopts fresh air, and the high-temperature heat exchanger 212 of the waste heat recovery module 210 is arranged between the air-to-air heat exchanger 211 and the circulating fan 130. The low-temperature exhaust gas discharged from the air-to-air heat exchanger 211 is directly transported to the low-temperature refrigerant heat exchanger 2211 of the heat pump module 220 for secondary heat recovery.

[0084] In this embodiment, Fig.10 A port connection Fig.11 A port in the coating oven system 1 is used to deliver the fresh air treated by the air-to-air heat exchanger 211 to the coating oven system 1; Fig.10 Port B connection Fig.11 Port B in the coating oven system 1 is used to transport the high-temperature exhaust gas discharged from the coating oven system 1 to the gas-to-gas heat exchanger 211; Fig.10 Port C in the coating oven system is used to connect the return air duct of the subsequent coating oven system 1. Fig.10 The D port is used to connect the exhaust duct of the subsequent coating oven system 1; Fig.11 E port connection Fig.12 Port E in the high temperature refrigerant heat exchanger 2212 is used to transport the 130°C hot water prepared by the high temperature refrigerant heat exchanger 2212 to the high temperature heat exchanger 212; Fig.11 F port connection Fig.12 The F port in the heat exchanger 212 is used to transport the hot water whose temperature has dropped after use to the high-temperature cache tank 223 of the heat pump module 220 for storage; Fig.10 G port connection Fig.12 The G port in the heat pump module 220 is used to transport the low-temperature exhaust gas discharged from the gas-to-gas heat exchanger 211 to the low-temperature refrigerant heat exchanger 2211 of the heat pump module 220 for secondary heat recovery.

[0085] In the fourth embodiment of this application, please refer to Figures 13 to 16 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 circulating fan 130 and the heater 150, and the low-temperature exhaust gas discharged from the air-to-air heat exchanger 211 is directly transported to the low-temperature refrigerant heat exchanger 2211 of the heat pump module 220 for secondary heat recovery.

[0086] In this embodiment, Fig.14 A port connection Fig.15A port in the coating oven system 1 is used to deliver the fresh air treated by the air-to-air heat exchanger 211 to the coating oven system 1; Fig.14 Port B connection Fig.15 Port B in the coating oven system 1 is used to transport the high-temperature exhaust gas discharged from the coating oven system 1 to the gas-to-gas heat exchanger 211; Fig.14 Port C in the coating oven system is used to connect the return air duct of the subsequent coating oven system 1. Fig.14 Port D in the coating oven system is used to connect the exhaust duct of the subsequent coating oven system 1. Fig.14 The E port in the middle is used to connect the water outlet of the subsequent high-temperature heat exchanger 212. Fig.14 The F port in the middle is used to connect the water inlet of the subsequent high-temperature heat exchanger 212; Fig.14 G port connection Fig.16 The G port in the heat exchanger 212 is used to transport the hot water whose temperature has dropped after use to the high-temperature cache tank 223 of the heat pump module 220 for storage; Fig.14 H port connection Fig.16 The H port in the high temperature refrigerant heat exchanger 2212 is used to transport the 130°C hot water prepared by the high temperature refrigerant heat exchanger 2212 to the high temperature heat exchanger 212; Fig.15 I port connection Fig.16 The I port in the heat pump module 220 is used to transport the low-temperature exhaust gas discharged from the gas-to-gas heat exchanger 211 to the low-temperature refrigerant heat exchanger 2211 of the heat pump module 220 for secondary heat recovery.

[0087] Optionally, under normal circumstances, the exhaust gas discharged by the negative electrode coating machine is mainly water vapor, and the harmful substances contained in it can be ignored or even do not contain any harmful substances. In this case, the coating system does not need to set up an exhaust gas treatment system 3 to achieve the purpose of reducing costs; when the exhaust gas discharged by the negative electrode coating machine contains more harmful substances, the coating system at this time needs to set up an exhaust gas treatment system 3 to purify the exhaust gas to ensure that the exhaust gas does not pollute the environment.

[0088] For example, please refer to Fig. 9 and Fig.13 The coating system applied to the negative electrode coating machine of the embodiment of the present application is provided with an exhaust gas treatment system 3.

[0089] therefore, Fig.12 The low-temperature exhaust gas after being treated by the low-temperature refrigerant heat exchanger 2211 is transported to the exhaust gas treatment system 3 for treatment. Fig.16 The low-temperature exhaust gas after being treated by the low-temperature refrigerant heat exchanger 2211 is transported to the exhaust gas treatment system 3 for treatment.

[0090] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0091] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A heat exchange recovery system, characterized in that: Used to recover heat from high-temperature exhaust gas discharged from the coating oven system, the heat exchange recovery system includes: a waste heat recovery module, comprising an air-to-air heat exchanger and a high-temperature heat exchanger, wherein the air-to-air heat exchanger is connected to a first exhaust port of the coating oven system, the air-to-air heat exchanger utilizes the high-temperature exhaust gas discharged from the coating oven system to perform a first heating of the input gas flowing to the high-temperature heat exchanger, and converts the high-temperature exhaust gas into a low-temperature exhaust gas, the high-temperature heat exchanger is connected to an air inlet of the coating oven system, and the high-temperature heat exchanger is used to perform a second heating of the input gas; and The heat pump module is arranged between the gas-to-gas heat exchanger and the high-temperature heat exchanger, and is used to convert the low-grade heat of the low-temperature exhaust gas into the high-grade heat required by the high-temperature heat exchanger.

2. The heat exchange recovery system according to claim 1, characterized in that: A circulation fan is arranged between the air inlet and the air-to-air heat exchanger, the high-temperature heat exchanger is arranged between the air-to-air heat exchanger and the circulation fan, or the high-temperature heat exchanger is arranged between the circulation fan and the air inlet.

3. The heat exchange recovery system according to claim 1, 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.

4. The heat exchange recovery system according to claim 3, 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.

5. The heat exchange recovery system according to claim 4, 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.

6. The heat exchange recovery system according to claim 3, characterized in that: The waste heat recovery module further includes a low-temperature heat exchanger disposed between the gas-to-gas heat exchanger and the high-temperature heat exchanger, and the heat pump module further includes a chiller disposed between the low-temperature heat exchanger and the heat pump unit.

7. The heat exchange recovery system according to any one of claims 3 to 6, characterized in that: The low-temperature refrigerant heat exchanger is an evaporator, and the heat pump module further includes a second air valve disposed at the inlet of the low-temperature refrigerant heat exchanger, wherein the second air valve is used to control the air volume entering the low-temperature refrigerant heat exchanger.

8. The heat exchange recovery system according to any one of claims 3 to 6, characterized in that: The liquid in the circulation flow path is heat transfer oil.

9. The heat exchange recovery system according to claim 8, characterized in that: The high-temperature refrigerant heat exchanger heats the heat transfer oil in the circulation flow path to 130°C.

10. A coating system, characterized in that: It comprises a heat exchange recovery system as described in any one of claims 1 to 9.

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