Heat pump-rotor composite heat and moisture recovery enhanced fresh air dehumidifier unit for coating process

Abstract

This invention relates to a heat pump-rotor composite heat and humidity recovery enhanced fresh air dehumidifier unit for coating processes. It includes a fresh air filter, a rotary total heat exchanger, a first-stage heat pump unit, a dehumidification and reheat unit, a second-stage heat pump unit, and a supply air fan, all connected sequentially via a fresh air flow path. It also includes an exhaust air filter and an exhaust air fan, which are connected sequentially via an exhaust air flow path. Compared to existing technologies, this invention utilizes a rotary total heat exchanger and switchable air ducts to recover total heat from the exhaust gas from VOCs treatment devices in the coating workshop, effectively reducing the heat and humidity treatment load on the fresh air. Combined with a heat pump system employing cascaded intake and exhaust technology, it significantly improves the heat and humidity treatment efficiency of the fresh air, reduces the unit's operating energy consumption, and achieves energy conservation and emission reduction.

Description

Technical Field

[0001] This invention relates to the field of fresh air dehumidification technology, and in particular to a heat pump-rotor composite heat and moisture recovery enhanced fresh air dehumidification unit for coating processes. Background Technology

[0002] Industrial coating processes generate a large amount of harmful pollutants. To improve the working environment and protect workers' health, a common practice is to introduce fresh outdoor air to dilute the concentration of indoor pollutants. However, the introduction of fresh air brings a large heat and humidity load, and in coating workshops, fresh air dehumidification systems are generally used directly as air conditioners, resulting in huge energy consumption.

[0003] Currently, painting workshops mainly use rotary dehumidifiers for fresh air, such as the paint booth-specific air dehumidifier disclosed in CN105546668A. These dehumidifiers utilize the characteristics of the rotor to adsorb and desorb moisture at different temperatures to dehumidify the fresh air. However, the regeneration of the rotor requires a large amount of energy, and an additional temperature control module is needed to control the fresh air temperature, resulting in low overall system energy efficiency.

[0004] It is worth mentioning that, in order to control pollutant emissions and meet environmental protection requirements, painting workshops are usually also equipped with VOCs treatment devices (see...). Figure 1 Currently, the most common form is the combination of zeolite rotor and RTO equipment. The principle is to use the zeolite rotor to enrich the VOCs in the exhaust air, and then pass the VOCs-enriched air into the RTO equipment for combustion. Finally, the clean flue gas is discharged outdoors from the flue.

[0005] During the VOCs treatment process, a large amount of hot and dry air is stored in the device and is directly discharged outdoors without being utilized. How to build a device to recover heat and moisture from this air and use it for the heat and moisture treatment of fresh air is a technical problem that urgently needs to be solved. This can effectively improve the operating efficiency of the fresh air dehumidification system, significantly reduce the energy consumption of the unit, and achieve the goal of energy conservation and emission reduction. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a heat pump-rotor composite heat and humidity recovery efficiency-enhancing fresh air dehumidifier for coating processes. It recovers the total heat from the exhaust gas of the VOCs treatment device in the coating workshop through a rotary total heat exchanger and switchable air duct, effectively reducing the heat and humidity treatment load of the fresh air. Combined with a heat pump system that adopts cascade intake and exhaust technology, it greatly improves the heat and humidity treatment efficiency of the fresh air, reduces the unit's operating energy consumption, and achieves the goal of energy saving and emission reduction.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] This invention provides a heat pump-rotor composite heat and moisture recovery enhanced fresh air dehumidifier unit for coating process, comprising a fresh air filter, a rotary total heat exchanger, a first-stage heat pump unit, a dehumidification and reheat unit, a second-stage heat pump unit, and a supply fan connected in sequence through a fresh air flow path;

[0009] It also includes an exhaust filter and an exhaust fan, wherein the exhaust filter, the rotary total heat exchanger and the exhaust fan are connected in sequence through an exhaust flow path.

[0010] Furthermore, the first-stage heat pump unit includes a first-stage heat pump unit compressor, a first-stage heat pump unit four-way reversing valve, a first-stage heat pump unit external heat exchanger, a first-stage heat pump unit throttling element, and a first-stage heat pump unit internal heat exchanger, which are connected in sequence through refrigerant pipelines.

[0011] Furthermore, the fresh air flow path is connected to the air flow path of the heat exchanger in the first-stage heat pump unit;

[0012] The first-stage heat pump unit also includes a first-stage heat pump unit condenser fan located on the external heat exchanger of the first-stage heat pump unit.

[0013] Furthermore, the second-stage heat pump unit includes a second-stage heat pump unit compressor, a second-stage heat pump unit four-way reversing valve, a second-stage heat pump unit external heat exchanger, a second-stage heat pump unit throttling element, and a second-stage heat pump unit internal heat exchanger, which are connected in sequence through a refrigerant circuit.

[0014] Furthermore, the fresh air flow path is connected to the air flow path of the heat exchanger in the second-stage heat pump unit;

[0015] The second-stage heat pump unit also includes a second-stage heat pump unit condenser fan located on the external heat exchanger of the second-stage heat pump unit.

[0016] Furthermore, the external heat exchangers of the first-stage heat pump unit and the second-stage heat pump unit are located outside the fresh air flow path to exchange heat with the outdoor air.

[0017] Furthermore, the dehumidification and reheat unit includes a dehumidification and reheat unit compressor, a reheat condenser, a dehumidification and reheat unit throttling element, and a dehumidification evaporator, which are connected in sequence through refrigerant pipelines.

[0018] Furthermore, the fresh air flow path is sequentially connected to the air flow path of the dehumidifying evaporator, the air flow path of the heat exchanger in the second-stage heat pump unit, the air flow path of the reheat condenser, and the air supply fan.

[0019] Furthermore, the heat pump-rotor composite heat and humidity recovery enhanced fresh air dehumidifier unit also includes a three-way valve connected to the exhaust air filter through the exhaust air flow path. The adjustment of the three-way valve realizes the switching of the exhaust air intake position between the zeolite rotor exhaust port and the RTO exhaust port.

[0020] Furthermore, half of the rotary total heat exchanger is placed in the fresh air flow path and the other half is placed in the exhaust air flow path. The rotary wheel is driven by a motor to rotate between the fresh air flow path and the exhaust air flow path.

[0021] Furthermore, the rotary heat exchanger used in this solution differs from the dehumidification rotary wheel used in traditional painting workshops. Its rotary wheel operates at a high speed and has a low water vapor desorption temperature, thereby achieving the best heat and moisture recovery efficiency.

[0022] Furthermore, when the heat pump-rotor composite heat and moisture recovery enhanced fresh air dehumidifier is in cooling dehumidification mode, the first-stage heat pump unit is turned on and runs in cooling mode, and the second-stage heat pump unit is turned on and runs in cooling mode.

[0023] On the fresh air flow path side, the air supply fan is turned on, driving the high temperature and high humidity of the outdoor fresh air to be introduced. After being purified by the fresh air filter, it passes through the rotary total heat exchanger, and then sequentially through the heat exchanger in the first stage heat pump unit, the dehumidifying evaporator, and the heat exchanger in the second stage heat pump unit. In this way, the air is cooled and dehumidified in stages to meet the humidity requirements of the supply air. Then it flows through the reheat condenser to be reheated to meet the temperature requirements of the supply air, and finally it is sent into the painting workshop by the air supply fan.

[0024] On the exhaust flow path side, the three-way valve switches to the zeolite rotor exhaust port, the exhaust fan starts, and the dry exhaust air after the zeolite rotor is introduced. It first passes through the exhaust filter for purification, then flows through the rotor-type total heat exchanger, carrying away the heat and adsorbed moisture on the rotor-type total heat exchanger, and finally enters the exhaust flue through the exhaust fan.

[0025] Furthermore, when the heat pump-rotor composite heat and moisture recovery enhanced fresh air dehumidifier is in heating mode, the first-stage heat pump unit is turned on and runs in heating mode, and the second-stage heat pump unit is turned on and runs in heating mode.

[0026] On the side of the fresh air flow path, the air supply fan in the fresh air flow path is turned on, driving the introduction of low-temperature outdoor fresh air. After being purified by the fresh air filter, it passes through the rotary total heat exchanger, and then passes through the heat exchanger in the first-stage heat pump unit and the heat exchanger in the second-stage heat pump unit in sequence to be heated step by step to meet the air supply temperature requirements. Finally, it is sent into the painting workshop by the air supply fan.

[0027] On the exhaust flow path side, the three-way valve switches to the RTO exhaust port, the exhaust fan starts, and the high-temperature exhaust air of the RTO is introduced. It first passes through the exhaust filter for purification, then flows through and heats the rotary total heat exchanger, and finally enters the exhaust flue through the exhaust fan.

[0028] Compared with the prior art, the present invention has the following technical advantages:

[0029] 1. This invention employs a rotary total heat exchanger for heat and moisture recovery from exhaust air, and the exhaust duct features a switchable design. In summer, ambient-temperature, dry exhaust air is drawn from the rear exhaust vent of the zeolite rotor to remove some moisture from the fresh air, effectively reducing the dehumidification load on the heat pump. In winter, high-temperature exhaust air is drawn from the RTO exhaust vent to increase the heat pump's inlet air temperature while reducing humidity, thus reducing the heating load on the heat pump or even providing free heating, resulting in drier airflow and higher coating drying efficiency. During transitional seasons, the heat recovery rotor can be operated as needed to reduce the heat pump's dehumidification load, or the heat pump dehumidification module can be operated independently to achieve efficient dehumidification of fresh air. By fully utilizing the exhaust air from each part of the VOCs treatment equipment, the annual operating energy efficiency of the fresh air dehumidifier is significantly improved.

[0030] 2. This invention applies cascaded intake and exhaust technology, and sets up a multi-stage heat pump unit in the fresh air flow path after the rotary total heat exchanger to form a cascaded heat and humidity treatment for the fresh air, which improves the uniformity of the heat exchange temperature difference distribution between the refrigerant and the fresh air, reduces irreversible losses in the heat exchange process, and further improves the system energy efficiency.

[0031] 3. This invention incorporates a dehumidification and reheat unit. A dehumidification evaporator cools and dehumidifies the fresh air, recovering its sensible and latent heat. This recovered heat is then used in a reheat condenser to reheat the fresh air, eliminating the additional power consumption required for reheating the fresh air. Furthermore, the reheat condenser's intake air is cooled and dehumidified at a low temperature, effectively reducing the condensation temperature of the dehumidification and reheat unit and significantly improving cycle efficiency.

[0032] 4. This invention includes a multi-stage heat pump unit and a dehumidification and reheat unit, and each unit uses a variable frequency compressor, allowing for flexible overall unit operation and adjustment. Each unit can operate independently, and a failure in one unit will not affect the normal operation of the remaining units, giving the system good fault tolerance and reliability.

[0033] 5. This invention draws air downstream of the main operating components of the VOCs treatment equipment, without affecting the normal operation of the upstream VOCs treatment equipment, thus ensuring that emission requirements are met. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the principle of VOCs treatment equipment system in the existing technology.

[0035] Figure 2 This is a schematic diagram of the system principle in Embodiment 1 of the present invention.

[0036] Figure 3 This is a schematic diagram of the system principle in Embodiment 2 of the present invention.

[0037] In the diagram, 1 represents outdoor fresh air, 2 represents workshop air supply, 3 represents zeolite rotor exhaust, 4 represents RTO exhaust, 5 represents flue exhaust, 6 represents rotor-type total heat exchanger, 7-1 represents the compressor of the first-stage heat pump unit, 7-2 represents the external heat exchanger of the first-stage heat pump unit, 7-3 represents the throttling element of the first-stage heat pump unit, 7-4 represents the internal heat exchanger of the first-stage heat pump unit, 7-5 represents the condenser fan of the first-stage heat pump unit, 7-6 represents the four-way reversing valve of the first-stage heat pump unit, 8-1 represents the compressor of the second-stage heat pump unit, 8-2 represents the external heat exchanger of the second-stage heat pump unit, 8-3 represents the throttling element of the second-stage heat pump unit, and 8-4 represents the internal heat exchanger of the second-stage heat pump unit. Heat exchanger, 8-5 is the condenser fan of the second-stage heat pump unit, 8-6 is the four-way reversing valve of the second-stage heat pump unit, 9-1 is the compressor of the dehumidification and reheat unit, 9-2 is the condenser of the dehumidification and reheat unit, 9-3 is the throttling element of the dehumidification and reheat unit, 9-4 is the evaporator of the dehumidification and reheat unit, 10 is the supply fan, 11 is the exhaust fan, 12 is the three-way valve, 13 is the fresh air filter, 14 is the exhaust filter, 15 is the workshop return air filter, 16 is the workshop return air fan, 17 is the zeolite rotor, 18 is the RTO inlet fan, 19 is the RTO equipment (regenerative thermal oxidizer), 20 is the heat exchanger, 21 is the exhaust flue. Detailed Implementation

[0038] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Component models, material names, connection structures, control methods, algorithms, and other features not explicitly described in this technical solution are considered common technical features disclosed in the prior art.

[0039] Example 1

[0040] See Figure 2 In this embodiment, the heat pump + rotary wheel composite heat and moisture recovery enhanced fresh air dehumidifier unit for coating process includes an air flow path, which has a fresh air flow path and an exhaust air flow path; the fresh air flow path is sequentially connected to a fresh air filter 13, a rotary wheel total heat exchanger 6, a first-stage heat pump unit, a dehumidification and reheat unit, a second-stage heat pump unit, and a supply air fan 10; the exhaust air flow path is sequentially connected to a three-way valve 12, an exhaust air filter 14, a rotary wheel total heat exchanger 6, and an exhaust air fan 11.

[0041] In specific implementation, the first-stage heat pump unit has a first-stage heat pump unit compressor 7-1, a first-stage heat pump unit four-way reversing valve 7-6, a first-stage heat pump unit external heat exchanger 7-2, a first-stage heat pump unit throttling element 7-3, and a first-stage heat pump unit internal heat exchanger 7-4 arranged in sequence. Each component is connected in sequence through refrigerant pipelines to form the refrigerant circuit of the first-stage heat pump unit. In addition, the first-stage heat pump unit is also equipped with a first-stage heat pump unit condenser fan 7-5 to assist the external heat exchanger in heat dissipation.

[0042] In specific implementation, the second-stage heat pump unit has a second-stage heat pump unit compressor 8-1, a second-stage heat pump unit four-way reversing valve 8-6, a second-stage heat pump unit external heat exchanger 8-2, a second-stage heat pump unit throttling element 8-3, and a second-stage heat pump unit internal heat exchanger 8-4 arranged in sequence. Each component is connected in sequence through refrigerant pipelines to form the refrigerant circuit of the second-stage heat pump unit. In addition, the second-stage heat pump unit is also equipped with a second-stage heat pump unit condenser fan 8-5 to assist the external heat exchanger in heat dissipation.

[0043] In specific implementation, the dehumidification and reheat unit includes a dehumidification and reheat unit compressor 9-1, a reheat condenser 9-2, a dehumidification and reheat unit throttling element 9-3, and a dehumidification evaporator 9-4 arranged in sequence. Each component is connected in sequence through a refrigerant pipeline to form a refrigerant circuit for the dehumidification and reheat unit.

[0044] In specific implementation, the heat exchanger 7-4, the dehumidifying evaporator 9-4, the heat exchanger 8-4, and the reheat condenser 9-2 in the first-stage heat pump unit are arranged in sequence in the fresh air flow path and placed between the rotary total heat exchanger 6 and the air supply fan 10.

[0045] In practice, the external heat exchanger 7-2 of the first-stage heat pump unit and the external heat exchanger 8-2 of the second-stage heat pump unit are installed outside the fresh air flow path to exchange heat with the outdoor air.

[0046] The exhaust flow path is a switchable air duct, and the air intake position of the exhaust flow path can be switched between the zeolite rotor exhaust port 3 and the RTO exhaust port 4 by adjusting the three-way valve 12.

[0047] In specific implementation, half of the rotary total heat exchanger 6 is placed in the fresh air flow path and the other half is placed in the exhaust air flow path. The rotary wheel is driven by a motor to rotate between the fresh air flow path and the exhaust air flow path.

[0048] The rotary heat exchanger used in this patent differs from the dehumidifying rotary heat exchanger used in traditional painting workshops. Its rotary heat exchanger operates at a high speed (10-20 rpm, while the dehumidifying rotary heat exchanger operates at only 15-30 rpm) and has a low water vapor desorption temperature (50-70°C for the rotary heat exchanger, while 90-120°C for the dehumidifying rotary heat exchanger), thus achieving the best heat and moisture recovery efficiency.

[0049] The operation process of this invention is as follows:

[0050] To meet the usage needs of different seasons, this invention has two operating modes: cooling and dehumidification, and heating.

[0051] (1) Cooling and dehumidification mode

[0052] On the refrigerant flow path side, the first-stage heat pump unit is turned on and operates in cooling mode. Ports D and C of the four-way reversing valve 7-6 of the first-stage heat pump unit are connected, as are ports S and E. In the refrigerant circuit, the two-phase refrigerant absorbs heat from the fresh air and evaporates into a low-temperature, low-pressure superheated gas in the heat exchanger 7-4 within the first-stage heat pump unit. This superheated gas is then drawn into the compressor 7-1 of the first-stage heat pump unit and compressed into a high-temperature, high-pressure refrigerant gas. It then enters the external heat exchanger 7-2 of the first-stage heat pump unit to dissipate heat to the outdoor air, becoming a subcooled refrigerant liquid. Afterward, it is throttled by the throttling element 7-3 of the first-stage heat pump unit into a low-temperature, low-pressure two-phase refrigerant, returning to the internal heat exchanger 7-4 of the first-stage heat pump unit. The second-stage heat pump unit is also turned on and operates in cooling mode. Ports D and C of the four-way reversing valve 8-6 of the second-stage heat pump unit are connected, as are ports S and E. The working process of this refrigerant circuit is the same as that of the first-stage heat pump unit. When the dehumidification and reheat unit is turned on, the two-phase refrigerant in the refrigerant circuit absorbs heat from the fresh air and evaporates into a low-temperature, low-pressure superheated gas in the dehumidification evaporator 9-4. After being drawn into the dehumidification and reheat unit compressor 9-1, it is compressed into a high-temperature, high-pressure refrigerant gas. Then, it enters the reheat condenser 9-2 to dissipate heat to the dehumidified fresh air and becomes a subcooled refrigerant liquid. After that, it is throttled by the dehumidification and reheat unit throttling element 9-3 into a low-temperature, low-pressure two-phase refrigerant and returns to the dehumidification evaporator 9-4.

[0053] On the airflow path side, the fresh air supply fan 10 in the fresh air flow path is turned on, driving the introduction of high-temperature and high-humidity outdoor fresh air 1. After being purified by the fresh air filter 13, it then passes through the rotary total heat exchanger 6, where part of the heat and humidity load is removed. It then sequentially passes through the heat exchanger 7-4 in the first-stage heat pump unit, the dehumidifying evaporator 9-4, and the heat exchanger 8-4 in the second-stage heat pump unit, where it is progressively cooled and dehumidified to meet the required supply air humidity. Next, it flows through the reheat condenser 9-2, where it is reheated to meet the required supply air temperature, and finally, it is delivered into the painting workshop by the supply air fan 10. On the exhaust air flow path side, the three-way valve 12 switches to the zeolite rotary exhaust port 3, and the exhaust fan 11 starts, driving the introduction of dried exhaust air after the zeolite rotary wheel. This air first passes through the exhaust filter 14 for purification, then flows through the rotary total heat exchanger 6, where the heat and adsorbed moisture are removed, and finally, it enters the exhaust flue through the exhaust fan 11.

[0054] (2) Heating mode

[0055] On the refrigerant flow path side, the first-stage heat pump unit is turned on and operates in heating mode. Ports D and E of the four-way reversing valve 7-6 of the first-stage heat pump unit are connected, as are ports S and C. In the refrigerant circuit, the two-phase refrigerant absorbs heat from the outdoor air and evaporates into a low-temperature, low-pressure superheated gas in the external heat exchanger 7-2 of the first-stage heat pump unit. This superheated gas is then drawn into the compressor 7-1 of the first-stage heat pump unit and compressed into a high-temperature, high-pressure refrigerant gas. It then enters the internal heat exchanger 7-4 of the first-stage heat pump unit, releasing heat to the fresh air and becoming a subcooled refrigerant liquid. Afterward, it is throttled by the throttling element 7-3 of the first-stage heat pump unit into a low-temperature, low-pressure two-phase refrigerant, returning to the external heat exchanger 7-2. The second-stage heat pump unit is also turned on and operates in heating mode. Ports D and E of the four-way reversing valve 8-6 of the second-stage heat pump unit are connected, as are ports S and C. The refrigerant circuit operation is the same as that of the first-stage heat pump unit. The dehumidification and reheat unit is not activated.

[0056] On the airflow path side, the supply fan 10 in the fresh air flow path is turned on, driving the low-temperature outdoor fresh air 1 to be introduced. After being purified by the fresh air filter 13, it flows through the rotary total heat exchanger 6 and is heated by the rotary total heat exchanger 6. Then, it passes through the heat exchanger 7-4 in the first-stage heat pump unit and the heat exchanger 8-4 in the second-stage heat pump unit in turn, being heated step by step to meet the supply air temperature requirements. Finally, it is sent into the painting workshop by the supply fan. On the exhaust air flow path side, the three-way valve 12 is switched to the RTO exhaust port 4, and the exhaust fan 11 is started, driving the high-temperature exhaust air of the RTO to be introduced. It first passes through the exhaust filter 14 for purification, then flows through the rotary total heat exchanger 6 and is heated by the rotary total heat exchanger 6. Finally, it enters the exhaust flue through the exhaust fan 11.

[0057] Example 2

[0058] This embodiment also uses a rotary total heat exchanger combined with a multi-stage series high-efficiency heat pump to achieve heat and humidity treatment of fresh air. The system principle is described in [link to system description]. Figure 3 .

[0059] Compared to Example 1, Example 2 only omits the switchable air duct design; the system draws air solely from the exhaust port of the zeolite rotor. In practical use, only in heating mode, because the exhaust air from the zeolite rotor is colder than the RTO exhaust air, the temperature rise of the fresh air after passing through the rotor-type total heat exchanger is lower than in Example 1. Therefore, the heat pump needs to handle a greater heating load, resulting in a slightly lower energy efficiency in heating mode compared to Example 1. However, due to the elimination of the switchable air duct design, Example 2 offers the advantage of easier engineering installation compared to Example 1. Otherwise, the system structure, operating mode, and working process are identical to Example 1.

[0060] The above embodiments do not fully demonstrate all components of the refrigerant cycle and air duct. In practice, common refrigeration accessories such as high-pressure liquid receivers, oil separators, filters, and dryers are installed in the refrigerant circuit, and air handling accessories such as filters, baffles, silencers, humidifiers, and sterilization devices are installed in the fresh air duct. Different air supply nozzles and air inlet grilles are selected, the fan position is changed, the dehumidification evaporator position is changed, or heat pump cycles, dehumidification reheat cycles, fans, and air valves are added without departing from the spirit of the technical solution of this invention. These are not considered as substantial improvements to this invention and should fall within the protection scope of this invention.

[0061] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A heat pump-rotor composite heat and moisture recovery enhanced fresh air dehumidifier unit for coating processes, characterized in that, It includes a fresh air filter (13), a rotary heat exchanger (6), a first-stage heat pump unit, a dehumidification and reheat unit, a second-stage heat pump unit, and a supply fan (10) connected in sequence through a fresh air flow path. It also includes an exhaust filter (14) and an exhaust fan (11), wherein the exhaust filter (14), the rotary total heat exchanger (6) and the exhaust fan (11) are connected in sequence through an exhaust flow path; The heat pump-rotor composite heat and humidity recovery enhanced fresh air dehumidifier unit also includes a three-way valve (12) connected to the exhaust filter (14) through the exhaust flow path. The three-way valve (12) adjusts to switch the air intake position of the exhaust flow path between the zeolite rotor exhaust port (3) and the RTO exhaust port (4). When the heat pump-rotor composite heat and moisture recovery enhanced fresh air dehumidifier is in cooling and dehumidification mode, the first-stage heat pump unit is turned on and runs in cooling mode, and the second-stage heat pump unit is turned on and runs in cooling mode. On the fresh air flow path side, the air supply fan (10) is turned on, driving the high temperature and high humidity fresh air (1) to be introduced. After being purified by the fresh air filter (13), it passes through the rotary total heat exchanger (6), and then passes through the heat exchanger (7-4) in the first stage heat pump unit, the dehumidifying evaporator (9-4), and the heat exchanger (8-4) in the second stage heat pump unit in sequence. In this way, the air supply humidity is met by cooling and dehumidifying in stages. Then it flows through the reheat condenser (9-2) and is reheated to meet the air supply temperature requirements. Finally, it is sent into the painting workshop by the air supply fan (10). On the exhaust flow path side, the three-way valve (12) is switched to the zeolite rotor exhaust port (3), the exhaust fan (11) is started, and the dry exhaust air after the zeolite rotor is introduced. It is first purified by the exhaust filter (14), and then flows through the rotor total heat exchanger (6), which takes away the heat and adsorbed moisture on the rotor total heat exchanger (6). Finally, it enters the exhaust flue through the exhaust fan (11). When the heat pump-rotor composite heat and moisture recovery enhanced fresh air dehumidifier is in heating mode, the first-stage heat pump unit is turned on and runs in heating mode, and the second-stage heat pump unit is turned on and runs in heating mode. On the side of the fresh air flow path, the air supply fan (10) in the fresh air flow path is turned on, driving the low-temperature fresh air (1) to be introduced. After being purified by the fresh air filter (13), it passes through the rotary total heat exchanger (6), and then passes through the heat exchanger (7-4) in the first stage heat pump unit and the heat exchanger (8-4) in the second stage heat pump unit to be heated step by step to meet the air supply temperature requirements. Finally, it is sent into the painting workshop by the air supply fan. On the exhaust flow path side, the three-way valve (12) is switched to the RTO exhaust port (4), the exhaust fan (11) is started, and the high-temperature exhaust air of the RTO is introduced. It is first purified by the exhaust filter (14), then flows through and heats the rotary total heat exchanger (6), and finally enters the exhaust flue through the exhaust fan (11).

2. The heat pump-rotor composite heat and moisture recovery enhanced fresh air dehumidifier unit for coating process according to claim 1, characterized in that, The first-stage heat pump unit includes a first-stage heat pump unit compressor (7-1), a first-stage heat pump unit four-way reversing valve (7-6), a first-stage heat pump unit external heat exchanger (7-2), a first-stage heat pump unit throttling element (7-3), and a first-stage heat pump unit internal heat exchanger (7-4), which are connected in sequence through refrigerant pipelines.

3. The heat pump-rotor composite heat and moisture recovery enhanced fresh air dehumidifier unit for coating process according to claim 2, characterized in that, The fresh air flow path is connected to the air flow path of the heat exchanger (7-4) in the first-stage heat pump unit; The first-stage heat pump unit also includes a first-stage heat pump unit condenser fan (7-5) located on the external heat exchanger (7-2) of the first-stage heat pump unit.

4. The heat pump-rotor composite heat and moisture recovery enhanced fresh air dehumidifier unit for coating process according to claim 3, characterized in that, The second-stage heat pump unit includes a second-stage heat pump unit compressor (8-1), a second-stage heat pump unit four-way reversing valve (8-6), a second-stage heat pump unit external heat exchanger (8-2), a second-stage heat pump unit throttling element (8-3), and a second-stage heat pump unit internal heat exchanger (8-4), which are connected in sequence through a refrigerant circuit.

5. The heat pump-rotor composite heat and moisture recovery enhanced fresh air dehumidifier unit for coating process according to claim 4, characterized in that, The fresh air flow path is connected to the air flow path of the heat exchanger (8-4) in the second-stage heat pump unit; The second-stage heat pump unit also includes a second-stage heat pump unit condenser fan (8-5) located on the external heat exchanger (8-2) of the second-stage heat pump unit.

6. The heat pump-rotor composite heat and moisture recovery enhanced fresh air dehumidifier unit for coating process according to claim 5, characterized in that, The dehumidification and reheat unit includes a dehumidification and reheat unit compressor (9-1), a reheat condenser (9-2), a dehumidification and reheat unit throttling element (9-3), and a dehumidification evaporator (9-4) connected in sequence through refrigerant pipelines.

7. A heat pump-rotor composite heat and moisture recovery enhanced fresh air dehumidifier unit for coating processes according to claim 6, characterized in that, The fresh air flow path is sequentially connected to the air flow path of the dehumidifying evaporator (9-4), the air flow path of the heat exchanger (8-4) in the second-stage heat pump unit, the air flow path of the reheat condenser (9-2), and the air supply fan (10).

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