Multi-heat-source coupled heat pump drying system

Abstract

The invention discloses a multi-heat-source coupled heat pump drying system, relates to the technical field of heat pump drying, and aims to solve the problem that existing drying equipment cannot meet heat supply requirements at different temperatures. The system comprises a plurality of heat pump drying modules, each heat pump drying module is connected with a compression module, each compression module comprises a compressor unit and a gas-liquid separator connected with the compressor unit, each heat pump drying module comprises a drying room and a heating evaporation assembly arranged in the drying room, and supercharging equipment is arranged between every two adjacent heat pump drying modules. The heating evaporation assembly communicates with the compressor unit and the gas-liquid separator through a heating loop. The characteristic that the pressure of the refrigerants in the compressor is gradually increased is utilized, refrigerants with different pressures are selectively extracted, heat pump sub-circulation is constructed, the heat supply flexibility of the heat pump system is improved, and meanwhile the heat supply requirements of different temperatures are met.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pump drying, and in particular to a heat pump drying system coupled with multiple heat sources. Background Art

[0002] Heat pump-based medium- and low-temperature drying technology (under 75°C) is mature, and high-temperature heat pump drying technology (above 75°C) is being widely adopted. As heat pump heating temperatures gradually increase, the temperature range between the heat source and heat sink gradually widens. This temperature range can be effectively utilized to simultaneously meet heating needs at different temperatures using the same heat pump.

[0003] The Chinese patent with publication number CN116951914A mainly relates to real-time monitoring and remote control of drying equipment, and cannot solve the above-mentioned technical problems. Summary of the Invention

[0004] The present invention solves the problem that current drying equipment cannot meet the heating needs of different temperatures, and proposes a heat pump drying system with multiple heat sources coupled to meet the heating needs of different temperatures.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solution: a multi-heat source coupled heat pump drying system, comprising a plurality of heat pump drying modules, each of which is connected to a compression module, the compression module comprising a compressor unit and a gas-liquid separator connected to the compressor unit, each of which comprises a drying room and a heating evaporation component arranged in the drying room, a boosting device is provided between adjacent heat pump drying modules, and the heating evaporation component is respectively connected to the compressor unit and the gas-liquid separator through a heating circuit.

[0006] In this technical solution, the heat pump drying module is connected to the compression module, and the joint action of the heat pump drying module and the compression module is used to achieve heating and drying in different temperature ranges. This application can utilize the characteristic of gradually increasing refrigerant pressure in the compressor to selectively extract refrigerants of different pressures, construct a heat pump sub-cycle, and improve the flexibility of heating supply of the heat pump system.

[0007] The present invention is further configured as follows: the heating and evaporation component includes a heating component and an evaporation component arranged in the drying room, the heating component includes an air heater and an air electric heater, an air circulation device is arranged around the air electric heater, one end of the air heater is connected to the outlet of the compressor unit, and the other end of the air heater is connected to the heating circuit.

[0008] In this technical solution, during the start-up phase of the drying mode, the corresponding electric air heater and the surrounding air circulation device are started until the temperature in the drying room reaches a preset value.

[0009] The present invention is further configured such that: the heating circuit includes a filter connected to the air heater, the other end of the filter is connected to an electronic expansion valve, and the other end of the electronic expansion valve is connected to an evaporation component.

[0010] In this technical solution, the heating circuit is arranged outside the drying room, the electronic expansion valve can play a throttling role, and the filter plays a filtering role.

[0011] The present invention is further configured as follows: the boosting device includes a first boosting device and a second boosting device, the first boosting device and the second boosting device are connected to each other, and the first boosting device and the second boosting device are both boosting pumps.

[0012] In this technical solution, by setting the above-mentioned boosting equipment, the waste heat of drying rooms with different temperatures can be used simultaneously to achieve energy saving effects.

[0013] The present invention is further configured as follows: the compressor group of the compression module includes several outlet ends and one inlet end, the different outlet ends of the compressor group are connected to different heat pump drying modules, the inlet end of the compressor group is connected to the gas-liquid separator, and the inlet end of the gas-liquid separator is connected to different heat pump drying modules.

[0014] The present invention is further configured such that a liquid storage tank is provided and connected between different outlet ends of the compressor unit of the compression module and the heat pump drying module.

[0015] Specifically, a first liquid storage tank is arranged between the first outlet end of the compressor group of the compression module and the first heat pump drying module, a second liquid storage tank is arranged between the second outlet end of the compressor group of the compression module and the second heat pump drying module, and a third liquid storage tank is arranged between the third outlet end of the compressor group of the compression module and the third heat pump drying module.

[0016] The present invention is further configured as follows: the compressor unit is specifically a first compressor, and the first compressor is provided with a plurality of outlet ports.

[0017] In this technical solution, the compressor unit may be a single first compressor.

[0018] The present invention is further configured as follows: the compressor group is specifically a compressor string, the compressor string includes a plurality of sub-compressors, the plurality of sub-compressors are connected in series, and connecting ports are provided between adjacent sub-compressors, and the connecting ports are all connected to the heat pump drying module.

[0019] In the present technical solution, the compressor unit can also be a compressor string composed of multiple sub-compressors, including a first sub-compressor, a second sub-compressor and a third sub-compressor. The first sub-compressor, the second sub-compressor and the third sub-compressor are connected in sequence. An outlet A is provided between the first sub-compressor and the second sub-compressor, and an outlet B is provided between the second sub-compressor and the third sub-compressor. Both outlet A and outlet B are connected to the heating and evaporation components in the drying room.

[0020] The present invention is further configured such that a third solenoid valve is provided between the heating circuit and the gas-liquid separator.

[0021] In this technical solution, the third solenoid valve can be controlled to open and close. When the third solenoid valve is opened, the high-temperature heating mode can be turned on.

[0022] The present invention is further configured as follows: the gas-liquid separator is further connected to a first solenoid valve and a second solenoid valve, and the second solenoid valve is directly connected to one of the heat pump drying modules.

[0023] In this technical solution, the heat pump mode can be switched by controlling the first solenoid valve and the second solenoid valve.

[0024] The present invention can bring the following beneficial effects: 1. The present invention relates to a heat pump drying system with multiple heat sources coupled. Utilizing the characteristic of gradually increasing refrigerant pressure in the compressor, the system selectively extracts refrigerants of different pressures to construct a heat pump sub-cycle, thereby improving the flexibility of the heat pump system in heating and meeting the requirements of different heating temperatures. 2. The multi-stage boosting technology is used to realize the simultaneous utilization of waste heat from drying rooms at different temperatures, thus achieving energy-saving effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is an overall schematic diagram of a multi-heat source coupled heat pump drying system of the present application.

[0026] Figure 2 This is a schematic diagram of a heat pump drying system compressor unit with multiple heat sources coupled in the present application, which consists of multiple sub-compressors.

[0027] Reference numerals: First solenoid valve 1, second solenoid valve 2, third solenoid valve 3, first booster pump 4, fourth solenoid valve 5, second booster pump 6, fifth solenoid valve 7, gas-liquid separator 8, first compressor 9, first liquid storage tank 10, second liquid storage tank 11, third liquid storage tank 12, first drying room 13, first evaporator 14, first electronic expansion valve 15, first filter 16, first air heater 17, first air circulation 18, sixth solenoid valve 19, second drying room 20, second evaporator 21, second solenoid expansion valve 22, second filter 23, second air heater 24, second air circulation 25, third drying room 26, third evaporator 27, fourth electronic expansion valve 28, third filter 29, third air heater 30, third air circulation 31, first air electric heater 32, second air electric heater 33, third air electric heater 34, first sub-compressor 35, second sub-compressor 36, third sub-compressor 37. DETAILED DESCRIPTION

[0028] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific implementation method described herein is only an optimal embodiment of the present invention, which is only used to explain the present invention and does not limit the scope of protection of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] Example 1 This embodiment proposes a heat pump drying system with multiple heat sources coupled. Figure 1 and Figure 2 It mainly includes multiple heat pump drying modules, each of which is connected to a compression module. The compression module includes a compressor unit and a gas-liquid separator 8. The gas-liquid separator 8 is connected to the compressor unit. Each heat pump drying module includes a drying room and a heating evaporation component. The heating evaporation component is arranged in the drying room. A booster device is provided between adjacent heat pump drying modules. The heating evaporation component is respectively connected to the compressor unit and the gas-liquid separator 8 through a heating circuit.

[0030] In this technical solution, the heat pump drying module is connected to the compression module, and the joint action of the heat pump drying module and the compression module is used to achieve heating and drying in different temperature ranges. This application can utilize the characteristic of gradually increasing refrigerant pressure in the compressor to selectively extract refrigerants of different pressures, construct a heat pump sub-cycle, and improve the flexibility of heating supply of the heat pump system.

[0031] In this embodiment, there are three heat pump drying modules. Figure 1 , from top to bottom are the first heat pump drying module, the second heat pump drying module and the third heat pump drying module.

[0032] Each heat pump drying module corresponds to a corresponding drying room, namely the first drying room 13 , the second drying room 20 and the third drying room 26 .

[0033] The heating and evaporation components mainly include a heating component and an evaporation component. The above-mentioned heating component and evaporation component are both arranged in the drying room. The heating component includes an air heater and an air electric heater. An air circulation device is arranged around the air electric heater. One end of the air heater is connected to the outlet of the compressor unit, and the other end of the air heater is connected to the heating circuit.

[0034] In this technical solution, during the start-up phase of the drying mode, the corresponding electric air heater and the surrounding air circulation device are started until the temperature in the drying room reaches a preset value.

[0035] The first heat pump drying module includes a first heating component and a first evaporation component. The first heating component includes a first heating evaporation component. The first heating evaporation component specifically includes a first air heater 17 and a first air electric heater 32. The first air heater 17 and the first air electric heater 32 are both arranged in the first drying room 13.

[0036] A first air circulation system 18 is provided around the first electric air heater 32 . One end of the first air heater 17 is connected to the compressor unit, and the other end of the first air heater 17 is connected to the refrigeration circuit.

[0037] The second heat pump drying module includes a second heating component and a second evaporation component. The second heating component includes a second heating evaporation component. The second heating evaporation component specifically includes a second air heater 24 and a second air electric heater 33. The second air heater 24 and the second air electric heater 33 are both arranged in the second drying room 20.

[0038] A second air circulation 25 is provided around the second electric air heater 33 , one end of the second air heater 24 is connected to the compressor unit, and the other end of the second air heater 24 is connected to the refrigeration circuit.

[0039] The third heat pump drying module includes a third heating component and a third evaporation component. The third heating component includes a third heating evaporation component. The third heating evaporation component specifically includes a third air heater 30 and a third air electric heater 34. The third air heater 30 and the third air electric heater 34 are both arranged in the third drying room 26.

[0040] A second air circulation 25 is provided around the third electric air heater 33 , one end of the second air heater 24 is connected to the compressor unit, and the other end of the second air heater 24 is connected to the refrigeration circuit.

[0041] The above-mentioned evaporation component is specifically an evaporator, the first evaporation component is specifically the first evaporator 14 , the second evaporation component is specifically the second evaporator 21 , and the third evaporation component is specifically the third evaporator 27 .

[0042] The heating circuit includes a filter, one end of the filter is connected to the air heater, the other end of the filter is connected to the electronic expansion valve, and the other end of the electronic expansion valve is connected to the evaporation component.

[0043] In this technical solution, the heating circuit is arranged outside the drying room, the electronic expansion valve can play a throttling role, and the filter plays a filtering role.

[0044] In this embodiment, a heating circuit corresponds to each heating evaporation component, and includes a first heating circuit, a second heating circuit, and a third heating circuit.

[0045] Among them, the first heating circuit includes a first filter 16, one end of the first filter 16 is connected to the first air heater 17, the other end of the first filter 16 is connected to the first electronic expansion valve 15, the end of the first electronic expansion valve 15 away from the first filter 16 is connected to the first evaporator 14, and the other end of the first evaporator 14 is connected to the compression module.

[0046] The second heating circuit includes a second filter 23 , one end of the second filter 23 is connected to the second air heater 22 , the other end of the second filter 23 is connected to the second evaporator 21 , and the other end of the second evaporator 21 is connected to the compression module via a booster device.

[0047] The third heating circuit includes a third filter 29, one end of the third filter 29 is connected to the third air heater 28, the other end of the third air heater 28 is connected to the third evaporator 27, and the other end of the third evaporator 27 is connected to the compression module through a boosting device.

[0048] The above-mentioned boosting equipment includes a first boosting device and a second boosting device, the first boosting device and the second boosting device are connected to each other, and the first boosting device and the second boosting device are both boosting pumps.

[0049] In this technical solution, by setting the above-mentioned boosting equipment, the waste heat of drying rooms with different temperatures can be used simultaneously to achieve energy saving effects.

[0050] In this embodiment, the first boosting device is provided between the first heat pump drying module and the second heat pump drying module, and the second boosting device is provided between the second heat pump drying module and the third heat pump drying module.

[0051] The first boosting device is specifically a first boosting pump 4 , the second boosting device is specifically a second boosting pump 6 , and a fourth solenoid valve 5 is provided between the first boosting pump 4 and the second boosting pump 6 .

[0052] The compressor unit of the compression module includes several outlet ends and one inlet end. The different outlet ends of the compressor unit are connected to different heat pump drying modules. The inlet end of the compressor unit is connected to the gas-liquid separator 8, and the inlet end of the gas-liquid separator 8 is connected to different heat pump drying modules.

[0053] Liquid storage tanks are arranged and connected between different outlet ends of the compressor unit of the compression module and the heat pump drying module.

[0054] Specifically, a first liquid storage tank 10 is arranged between the first outlet end of the compressor group of the compression module and the first heat pump drying module, a second liquid storage tank 11 is arranged between the second outlet end of the compressor group of the compression module and the second heat pump drying module, and a third liquid storage tank 11 is arranged between the third outlet end of the compressor group of the compression module and the third heat pump drying module.

[0055] As one of the implementation methods, refer to Figure 1 The compressor unit is specifically a first compressor 8, and the first compressor 8 is provided with several outlet ports.

[0056] As another way, refer to Figure 2 The compressor group is specifically a compressor string, which includes several sub-compressors, which are connected in series, and connecting ports are provided between adjacent sub-compressors, and the connecting ports are all connected to the heat pump drying module.

[0057] In this embodiment, the compressor group can also be a compressor string composed of multiple sub-compressors. Figure 2 It includes a first sub-compressor 35, a second sub-compressor 36 and a third sub-compressor 37. The first sub-compressor 35, the second sub-compressor 36 and the third sub-compressor 37 are connected in sequence. An outlet A is provided between the first sub-compressor 35 and the second sub-compressor 36, and an outlet B is provided between the second sub-compressor 36 and the third sub-compressor 37. Both outlets A and B are connected to the heating and evaporation components in the drying room.

[0058] The first compressor 9 can be a variable-frequency compressor of a scroll, screw, or centrifugal type. Different refrigerant pressures can be utilized by opening holes at different locations on the same compressor. Alternatively, a compressor train consisting of a first sub-compressor 35, a second sub-compressor 36, and a third sub-compressor 37 can be used. The positions of ports A and B are selected based on actual temperature requirements. This technology can utilize 1 to 10 pressure gradients, meaning that 0 to 9 pressure holes can be opened on the compressor, or a compressor train consisting of 1 to 10 sub-compressors can be used.

[0059] A third electromagnetic valve 3 is further provided between the heating circuit and the gas-liquid separator 8. The gas-liquid separator 8 is further connected to the first electromagnetic valve 1 and the second electromagnetic valve 2, and the second electromagnetic valve 2 is directly connected to one of the heat pump drying modules.

[0060] The outlet end of the second evaporator 21 of the second heat pump drying module is connected to the sixth solenoid valve 19, the other end of the sixth solenoid valve 19 is respectively connected to the fourth solenoid valve 5 and the first solenoid valve 1, the other end of the fourth solenoid valve 5 is connected to the first booster pump 4, and the other end of the first solenoid valve 1 is connected to the gas-liquid separator 8.

[0061] The outlet end of the third evaporator 27 of the third heat pump drying module is connected to the fifth solenoid valve 7 and the second solenoid valve 2 respectively, the other end of the fifth solenoid valve 7 is connected to the second booster pump 6, and the other end of the second booster pump 6 is connected to the fourth solenoid valve 5.

[0062] In this embodiment, the heat pump has a high temperature heating mode, a medium temperature heating mode, a low temperature heating mode, a high temperature-medium temperature heating mode, a high temperature-medium temperature-low temperature heating mode, and a medium temperature-low temperature heating mode.

[0063] For the high-temperature heating mode, in this mode, the third solenoid valve 3 is opened; the refrigerant in the low-temperature, low-pressure, saturated state enters the first evaporator 14, absorbs heat and becomes a low-pressure superheated gas, then enters the gas-liquid separator 8, and is then compressed into a high-temperature, high-pressure gas by the first compressor 9, and then enters the first air heater 17 to absorb heat and cool down to a medium-temperature, high-pressure liquid, and then passes through the first filter 16, and is then throttled by the first electronic expansion valve 15, becoming a refrigerant in the low-temperature, low-pressure, saturated state, and then starts the next cycle.

[0064] For the medium-temperature heating mode, in this mode, the first solenoid valve 1 and the sixth solenoid valve 19 are open. The refrigerant in a low-temperature, low-pressure, saturated state enters the second evaporator 21, absorbs heat and becomes a low-pressure superheated gas, then enters the gas-liquid separator 8, is compressed by the first compressor 9 into a high-temperature, high-pressure gas, flows out from port B, enters the second air heater 24, absorbs heat and is cooled into a medium-temperature, high-pressure liquid, then passes through the second filter 23, is throttled by the second solenoid expansion valve 22, becomes a low-temperature, low-pressure, saturated refrigerant, and then begins the next cycle.

[0065] In the low-temperature heating mode, the first solenoid valve 1 and the second solenoid valve 2 are open. The refrigerant in a low-temperature, low-pressure, saturated state enters the third evaporator 27, absorbs heat and becomes a low-pressure, superheated gas, then enters the gas-liquid separator 8, is compressed by the first compressor 9 into a high-temperature, high-pressure gas, flows out from port A, enters the third air heater 30, absorbs heat and is cooled into a medium-temperature, high-pressure liquid, then passes through the third filter 29, is throttled by the fourth electronic expansion valve 28, becomes a low-temperature, low-pressure, saturated refrigerant, and then begins the next cycle.

[0066] For the high-temperature-medium-temperature heating mode, the high-temperature heating mode is first operated, and then the fourth solenoid valve 5 and the sixth solenoid valve 19 are opened. The partially compressed refrigerant flows out of the B port of the first compressor 9, then enters the second air heater 24 to absorb heat and cool to a medium-temperature high-pressure liquid, then passes through the second filter 23, and is throttled by the second solenoid expansion valve 22 to become a low-temperature, low-pressure, saturated refrigerant, then enters the second evaporator 21 to absorb heat and become a low-pressure superheated gas, then is pressurized by the first booster pump 4 to the same pressure as the refrigerant at the outlet of the first evaporator 14, and after mixing with the refrigerant, flows into the gas-liquid separator 8, and finally flows into the first compressor 9 to start the next cycle.

[0067] For the high-temperature-medium-temperature heating mode, the high-temperature-medium-temperature heating mode is first operated, and then the fifth solenoid valve 7 is opened. The partially compressed refrigerant flows out of port A of the first compressor 9, enters the third air heater 30, absorbs heat and cools to a medium-temperature, high-pressure liquid, then passes through the third filter 29, is throttled by the fourth electronic expansion valve 28, and becomes a low-temperature, low-pressure, saturated refrigerant. It then enters the third evaporator 27, absorbs heat and becomes a low-pressure, superheated gas. It is then pressurized by the second booster pump 6 to the same pressure as the refrigerant at the outlet of the second evaporator 21, mixed with it, and flows into the first booster pump 4. It is pressurized to the same pressure as the refrigerant at the outlet of the first evaporator 14, mixed with it, and flows into the gas-liquid separator 8. Finally, it flows into the first compressor 9 to start the next cycle.

[0068] For the medium-temperature-low-temperature heating mode, the medium-temperature heating mode is first operated, and then the fifth solenoid valve 7 is opened. The partially compressed refrigerant flows out of the A port of the first compressor 9, enters the third air heater 30, absorbs heat and cools to a medium-temperature high-pressure liquid, then passes through the third filter 29, is throttled by the fourth electronic expansion valve 28, and becomes a low-temperature, low-pressure, saturated refrigerant. It then enters the third evaporator 27, absorbs heat, and becomes a low-pressure superheated gas. It is then pressurized by the second booster pump 6 to the same pressure as the refrigerant at the outlet of the second evaporator 21, mixed with the refrigerant, and flows into the gas-liquid separator 8 together, and finally flows into the first compressor 9 to start the next cycle.

[0069] The system of this embodiment has high-temperature drying, medium-temperature drying, low-temperature drying, high-medium-temperature drying, high-medium-temperature drying, and medium-temperature drying modes. Each mode has a startup phase and a normal operation phase. The first drying room 13 is used for drying temperatures greater than 100°C, the second drying room 20 is used for drying temperatures between 75°C and 100°C, and the third drying room 26 is used for drying temperatures between 40°C and 75°C.

[0070] The high temperature drying mode includes a startup phase and a normal operation phase. In the startup phase, the first electric air heater 32 and the first air circulation 18 are started until the temperature of the first drying chamber 13 reaches 100°C.

[0071] Normal operation stage: The heat pump operates in high-temperature heating mode. After the air absorbs heat from the materials in the first drying chamber 13 and is cooled and humidified, it enters the first evaporator 14 and is further cooled and dehumidified, and then heated by the first air heater 17.

[0072] The medium-temperature drying mode includes a startup phase and a normal operation phase. During the startup phase, the second electric air heater 33 and the second air circulation system 25 are activated until the temperature in the second drying chamber 20 reaches 75°C. During the normal operation phase, the heat pump operates in a medium-temperature heating mode. After absorbing heat from the materials in the second drying chamber 20, the air is cooled and humidified. It then flows into the second evaporator 21, where it is further cooled and dehumidified, and then heated by the second air heater 24.

[0073] The low-temperature drying mode includes a startup phase and a normal operation phase. During the startup phase, the third air circulation system 31 and the third electric air heater 34 operate until the temperature in the third drying chamber 26 reaches 40°C. During the normal operation phase, the heat pump operates in a low-temperature heating mode. After the air absorbs heat from the materials in the third drying chamber 26, it is cooled and humidified. The air then flows into the third evaporator 27, where it is further cooled and dehumidified, and then heated by the third air heater 30.

[0074] For the high-temperature-medium-temperature drying mode, it includes a startup phase and a normal operation phase; startup phase: the first electric air heater 32 and the first air circulation 18 are started until the temperature of the first drying room 13 reaches 100°C. The second electric air heater 33 and the second air circulation 25 are started until the temperature of the second drying room 20 reaches 75°C. Normal operation phase: the heat pump operates in a high-temperature-medium-temperature heating mode. After the air in the first drying room 13 is cooled and humidified by the material, it passes into the first evaporator 14, is further cooled and dehumidified, and then is heated by the first air heater 17. After the air in the second drying room 20 is cooled and humidified by the material, it passes into the second evaporator 21, is further cooled and dehumidified, and then is heated by the second air heater 24.

[0075] The high-temperature-medium-temperature-low-temperature drying mode includes a startup phase and a normal operating phase. During the startup phase, the first electric air heater 32 and the first air circulation system 18 are activated until the temperature in the first drying chamber 13 reaches 100°C. The second electric air heater 33 and the second air circulation system 25 are activated until the temperature in the second drying chamber 20 reaches 75°C. The third air circulation system 31 and the third electric air heater 34 are activated until the temperature in the third drying chamber 26 reaches 40°C. During the normal operating phase, the heat pump operates in a high-temperature-medium-temperature-low-temperature heating mode. After the air in the first drying chamber 13 absorbs heat and becomes humidified by the material, it passes through the first evaporator 14 for further cooling and dehumidification, and is then heated by the first air heater 17. After the air in the second drying chamber 20 absorbs heat and becomes humidified by the material, it passes through the second evaporator 21 for further cooling and dehumidification, and is then heated by the second air heater 24. After the air in the third drying chamber 26 absorbs heat and becomes humidified by the material, it passes through the third evaporator 27 for further cooling and dehumidification, and is then heated by the third air heater 30.

[0076] For the medium-temperature-low temperature drying mode, it includes a startup phase and a normal operation phase; the startup phase: the second air electric heater 33 and the second air circulation 25 are started until the temperature of the second drying room 20 reaches 75°C. The third air circulation 31 and the third air electric heater 34 are started until the temperature of the third drying room 26 reaches 40°C. Normal operation phase: the heat pump operates in a medium-temperature-low temperature heating mode. After the air in the second drying room 20 is cooled and humidified by the material, it passes into the second evaporator 21, is further cooled and dehumidified, and then is heated by the second air heater 24. After the air in the third drying room 26 is cooled and humidified by the material, it passes into the third evaporator 27, is further cooled and dehumidified, and then is heated by the third air heater 30.

[0077] Finally, it should be noted that the above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions to the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention and are intended to be encompassed by the claims of the present invention.

Claims

1. A multi-heat source coupled heat pump drying system, characterized in that: The invention comprises a plurality of heat pump drying modules, each of which is connected to a compression module, the compression module comprising a compressor unit and a gas-liquid separator (8) connected to the compressor unit, each of which comprises a drying room and a heating evaporation component arranged in the drying room, a boosting device is provided between adjacent heat pump drying modules, and the heating evaporation component is respectively connected to the compressor unit and the gas-liquid separator (8) through a heating circuit.

2. The multi-heat source coupled heat pump drying system according to claim 1, characterized in that: The heating and evaporation component includes a heating component and an evaporation component arranged in the drying room. The heating component includes an air heater and an electric air heater. An air circulation device is arranged around the electric air heater. One end of the air heater is connected to the outlet of the compressor unit, and the other end of the air heater is connected to the heating circuit.

3. The multi-heat source coupled heat pump drying system according to claim 2, characterized in that: The heating circuit includes a filter connected to the air heater, the other end of the filter is connected to an electronic expansion valve, and the other end of the electronic expansion valve is connected to an evaporation component.

4. A multi-heat source coupled heat pump drying system according to claim 1, 2 or 3, characterized in that: The boosting device includes a first boosting device and a second boosting device, the first boosting device and the second boosting device are connected to each other, and both the first boosting device and the second boosting device are boosting pumps.

5. The multi-heat source coupled heat pump drying system according to claim 1, characterized in that: The compressor unit of the compression module includes several outlet ends and one inlet end, and the different outlet ends of the compressor unit are connected to different heat pump drying modules. The inlet end of the compressor unit is connected to the gas-liquid separator (8), and the inlet end of the gas-liquid separator (8) is connected to different heat pump drying modules.

6. The multi-heat source coupled heat pump drying system according to claim 5, characterized in that: Liquid storage tanks are provided and connected between different outlet ends of the compressor unit of the compression module and the heat pump drying module.

7. A multi-heat source coupled heat pump drying system according to claim 1 or 5, characterized in that: The compressor unit is specifically a first compressor (8), and the first compressor (8) is provided with a plurality of outlet ports.

8. A multi-heat source coupled heat pump drying system according to claim 1 or 5, characterized in that: The compressor group is specifically a compressor string, which includes a plurality of sub-compressors connected in series, and connecting ports are provided between adjacent sub-compressors, and the connecting ports are all connected to the heat pump drying module.

9. The multi-heat source coupled heat pump drying system according to claim 3, characterized in that: A third solenoid valve (3) is also provided between the heating circuit and the gas-liquid separator (8).

10. The multi-heat source coupled heat pump drying system according to claim 1, characterized in that: The gas-liquid separator (8) is further connected to a first solenoid valve (1) and a second solenoid valve (2), and the second solenoid valve (2) is directly connected to one of the heat pump drying modules.

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