Double-heat-source total heat recovery type heat pump drying system

Abstract

The utility model provides a double heat source total heat recovery type heat pump drying system which comprises an air source heat pump, an air cooling heat pump, an energy storage water tank, a water pump and at least one drying area, the air cooling heat pump is connected with the air source heat pump in parallel and communicated with the energy storage water tank, and the energy storage water tank is communicated with the at least one drying area. The air source heat pump, the air-cooled heat pump, the energy storage water tank and the drying area are communicated through a connecting pipeline, a water pump is arranged on the connecting pipeline, and the air-cooled heat pump is externally connected with a first hot water return pipeline and a first hot water supply pipeline; the air-cooled heat pump is further externally connected with a cold water return pipeline and a cold water supply pipeline and used for enabling cold generated by refrigeration of the air-cooled heat pump to flow to office and living quarters. According to the drying system, the air source heat pump and the air cooling heat pump are arranged in parallel to jointly provide heat energy for the drying area, heat discharged during refrigeration of the office and living quarters can be fully utilized, energy consumption during heat supply of the drying area is reduced, and the effects of saving energy and protecting the environment are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of drying, in particular to a dual-heat-source full-heat recovery type heat pump drying system. Background Art

[0002] Traditional drying uses coal as heat source, and the coal-fired drying system has the disadvantages of high ineffective energy consumption, low economic performance, and serious environmental pollution. The grain dryers currently under development still use coal-fired and oil-fired hot air furnaces with high energy consumption, high pollution, and low automation as the main heat source. Coal-fired and oil-fired grain dryers have high energy consumption, high emissions of pollutants such as smoke, carbon dioxide, and sulfur dioxide, resulting in energy waste and environmental pollution. This is inconsistent with the development goals of efficient agriculture, and is also inconsistent with my country's current concept of promoting energy conservation and emission reduction, protecting the ecological environment, and promoting sustainable development of the ecological environment. There are problems of high pressure on environmental protection and high production costs.

[0003] The drying of grain, tobacco, fruits and vegetables is mainly concentrated from May to October. During this period, there is a large demand for heating in the drying area of ​​the drying factory, and a large demand for cooling in the office and living area. The heat absorbed by the office and living area during the cooling process is often directly discharged into the outdoor air, resulting in heat waste. Summary of the invention

[0004] The utility model solves the problem of utilizing the heat generated in the refrigeration process of the office and living area as one of the heat sources, reducing energy consumption, and achieving the purpose of protecting the environment and saving energy.

[0005] In order to solve the above problems, the utility model provides a dual-heat source full heat recovery heat pump drying system, which uses a full heat recovery air-cooled heat pump and an air source heat pump connected in parallel as a dual heat source heating device to fully utilize the heat absorbed by the office and living area during the cooling process and reduce the energy consumption when heating the drying area. At the same time, only a smaller air source heat pump is needed to supplement the heat source for the drying area, reducing the investment in heating equipment for the drying area.

[0006] The utility model discloses a dual-heat-source full-heat recovery type heat pump drying system, which includes an air-source heat pump, an energy storage water tank, a water pump and at least one drying area, and also includes an air-cooled heat pump, the air-cooled heat pump is arranged in parallel with the air-source heat pump, and is connected to the energy storage water tank, the energy storage water tank is connected to at least one of the drying areas, the air-source heat pump, the air-cooled heat pump, the energy storage water tank and the drying area are connected through a connecting pipeline, a water pump is arranged on the connecting pipeline, which is used to drive the circulation of water in the energy storage water tank; the air-cooled heat pump is externally connected to a first hot water return pipeline and a first hot water supply pipeline, which is used to transmit the heat generated by the refrigeration of the air-cooled heat pump to the drying area through the connecting pipeline; the air-cooled heat pump is also externally connected to a cold water return pipeline and a cold water supply pipeline, which is used to flow the cold generated by the refrigeration of the air-cooled heat pump to the office and living area.

[0007] Furthermore, the air-cooled heat pump includes a first evaporator, a first compressor, a first throttle valve, and a first condenser, and the first evaporator, the first compressor, the first throttle valve, and the first condenser are connected through a first circulation pipeline.

[0008] Furthermore, the air-cooled heat pump also includes a heat recovery device, and the first condenser and the heat recovery device are arranged in parallel, wherein the first circulation pipeline includes a condenser branch and a heat recovery device branch, the condenser branch is provided with a first stop valve, and the heat recovery device branch is provided with a second stop valve; the first evaporator exchanges heat with the cold water return pipeline and the cold water supply pipeline, and is used to transport the cold energy generated by the air-cooled heat pump when it is working to the office and living area; the heat recovery device exchanges heat with the first hot water return pipeline and the first hot water supply pipeline, and is used to transfer the heat generated by the refrigeration of the air-cooled heat pump to the drying area.

[0009] Furthermore, the air source heat pump includes a second condenser, a second compressor, a second evaporator and a second throttle valve, and the second condenser, the second compressor, the second evaporator and the second throttle valve are connected through a second circulation pipeline; the second condenser exchanges heat with the second hot water return pipeline and the second hot water supply pipeline, so as to transfer the heat generated by the refrigeration of the air source heat pump to the drying area.

[0010] Furthermore, the energy storage water tank includes a hot water tank and a return water tank, the hot water tank is provided with a first temperature sensor, and the return water tank is provided with a second temperature sensor.

[0011] Furthermore, the water inlet of the hot water tank is connected to the air-cooled heat pump via the first hot water supply pipeline, and the water inlet of the hot water tank is connected to the air source heat pump via the second hot water supply pipeline, and the first hot water supply pipeline and the second hot water supply pipeline are provided with independently controlled third stop valve and fourth stop valve; the water outlet of the hot water tank is connected to the fan water inlet pipeline of the drying area, and the fan water inlet pipeline is provided with a seventh stop valve.

[0012] Furthermore, the water outlet of the return water tank is connected to the air-cooled heat pump via the first hot water return pipe, and the water outlet of the return water tank is connected to the air source heat pump via the second hot water return pipe. The first hot water return pipe and the second hot water return pipe are provided with independently controlled fifth stop valve and sixth stop valve; the water inlet of the return water tank is connected to the fan return pipe of the drying area, and the fan return pipe is provided with an eighth stop valve.

[0013] Furthermore, a heat dissipation coil is provided in the drying area, a water inlet end of the heat dissipation coil is connected to the water inlet pipeline of the fan, a water outlet end of the heat dissipation coil is connected to the water return pipeline of the fan, and a fan is provided on one side of the heat dissipation coil.

[0014] Furthermore, a third temperature sensor is provided in the drying area for detecting the temperature in the drying area.

[0015] Furthermore, the water pump includes a first water pump, a second water pump, and a third water pump. The first water pump is arranged on the first hot water return pipe, the second water pump is arranged on the second hot water return pipe, and the third water pump is arranged on the fan water inlet pipe. The first water pump, the second water pump, and the third water pump are all variable frequency water pumps.

[0016] Compared with the prior art, the dual-heat-source full-heat recovery heat pump drying system described in the utility model has the following advantages:

[0017] 1. By connecting an air source heat pump and an air-cooled heat pump in parallel to provide heat energy for the drying area, the heat emitted during cooling of the office and living area can be fully utilized, the energy consumption during heating of the drying area can be reduced, energy can be saved, and the environment can be protected. At the same time, only a smaller air source heat pump is needed to supplement the heat source for the drying area, reducing the investment in heating equipment for the drying area. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0019] Figure 1 This is a flow chart of the utility model system;

[0020] Figure 2 This is a flow chart of the air-cooled heat pump system of the utility model;

[0021] Figure 3 This is a flow chart of the air source heat pump system of the utility model;

[0022] Figure 4 This is a system flow chart of Embodiment 2 of the present utility model;

[0023] Description of reference numerals:

[0024] 1. Air-cooled heat pump; 11. First evaporator; 12. First compressor; 13. First condenser; 14. First throttle valve; 151. First hot water return pipeline; 152. First hot water supply pipeline; 16. First circulation pipeline; 161. Condenser branch; 162. Heat recovery branch; 17. Heat recovery; 18. Cold water circuit; 181. Cold water return pipeline; 182. Cold water supply pipeline; 191. First stop valve; 192. Second stop valve; 2. Air source heat pump; 21. Second condenser; 22. Second compressor; 23. Second evaporator; 24. Second throttle valve; 251. Second hot water return pipeline; 252. Second hot water supply pipeline; 26. First Second circulation pipeline; 3. Energy storage water tank; 31. Hot water tank; 32. Return water tank; 311. Third stop valve; 312. Fourth stop valve; 313. Seventh stop valve; 314. Ninth stop valve; 321. Fifth stop valve; 322. Sixth stop valve; 323. Eighth stop valve; 324. Tenth stop valve; 4. Drying area; 41. Heat dissipation coil; 42. Fan; 431. Fan water inlet pipeline; 432. Fan water return pipeline; 5. Water pump; 501. First water pump; 502. Second water pump; 503. Third water pump; 6. Temperature sensor; 601. First temperature sensor; 602. Second temperature sensor; 603. Third temperature sensor; 7. Connecting pipeline. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. The specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0026] A dual-heat-source full-heat recovery heat pump drying system according to an embodiment of the utility model will be described in detail below in conjunction with the accompanying drawings.

[0027] Example 1

[0028] like Figure 1-3As shown, this embodiment provides a dual-heat source full-heat recovery heat pump drying system, including an air source heat pump 2, an energy storage water tank 3, a water pump 5 and at least one drying area 4, and also includes an air-cooled heat pump 1, the air-cooled heat pump 1 is arranged in parallel with the air source heat pump 2, and is connected to the energy storage water tank 3, the energy storage water tank 3 is connected to at least one drying area 4, the air source heat pump 2, the air-cooled heat pump 1, the energy storage water tank 3 and the drying area 4 are connected through a connecting pipe 7, and a water pump 5 is arranged on the connecting pipe 7 to drive the circulation of water in the energy storage water tank 3; the air-cooled heat pump 1 is externally connected to a first hot water return pipe 151 and a first hot water supply pipe 152, which are used to transfer the heat generated by the refrigeration of the air-cooled heat pump 1 to the drying area 4 through the connecting pipe 7; the air-cooled heat pump 1 is also externally connected to a cold water return pipe 181 and a cold water supply pipe 182, which are used to flow the cold generated by the refrigeration of the air-cooled heat pump 1 to the office and living area.

[0029] This setting makes full use of the heat emitted during cooling of the office and living area, and uses it as the heat source of the drying area 4, reducing the energy consumption of the drying area 4; a dual-source heat pump drying system in which an air-cooled heat pump 1 and an air-source heat pump 2 are operated in parallel is used to heat the drying area 4. The air-cooled heat pump 1 provides cooling capacity for the office and living area through the cold water loop 18, while using the full heat recovery technology to produce a large amount of hot water, which is used as the heat source for drying. When the recovered heat source is not enough to meet the heating demand of the drying area 4, the air-source heat pump 2 is turned on, and the two heat sources work together. This process can make full use of the heat emitted during cooling of the office and living area, reducing the energy consumption of the drying area; at the same time, only a smaller air-source heat pump is needed to supplement the heat source for the drying area, reducing the investment in heating equipment for the drying area.

[0030] Specifically, the air-cooled heat pump 1 includes a first evaporator 11, a first compressor 12, a first throttle valve 14, and a first condenser 13. The first evaporator 11, the first compressor 12, the first throttle valve 14, and the first condenser 13 are connected by a first circulation pipeline 16; when the air-cooled heat pump 1 starts working, the refrigerant absorbs heat and evaporates in the first evaporator 11, and is then compressed by the first compressor 12 to increase its temperature and pressure, and then releases heat in the first condenser 13, returns to a liquid state, and finally reduces the pressure through the expansion valve and enters the first evaporator 11 again.

[0031] Specifically, the air-cooled heat pump 1 also includes a heat recovery device 17, and the first condenser 13 and the heat recovery device 17 are arranged in parallel, wherein the first circulation pipeline 16 includes a condenser branch 161 and a heat recovery device branch 162, the condenser branch 161 is provided with a first stop valve 191, and the heat recovery device branch 162 is provided with a second stop valve 192; the first evaporator 11 exchanges heat with the cold water return pipeline 181 and the cold water supply pipeline 182, and is used to transfer the cold energy generated by the air-cooled heat pump 1 when it is working to the office and living area; the heat recovery device 17 exchanges heat with the first hot water return pipeline 151 and the first hot water supply pipeline 152, and is used to transfer the heat generated by the refrigeration of the air-cooled heat pump 1 to the drying area 4.

[0032] When there is a demand for cooling in the living and office area of ​​the drying factory, the air-cooled heat pump 1 performs cooling work, the first stop valve 191 is closed, the second stop valve 192 is opened, the condenser branch 161 is closed, the heat recovery branch 162 is opened, and the cold water return pipe 181 completes the heat release and cooling process in the first evaporator 11. After the refrigerant is heated in the first evaporator 11, it is driven by the first compressor 12 to enter the heat recovery branch 162, and then enters the heat recovery device 17. The hot water return water is driven by the first water pump 501, and heat is exchanged with the first hot water return pipe 151 and the first hot water supply pipe 152 in the heat recovery device 17. After the heat of the refrigerant is recovered, it flows into the hot water tank 31.

[0033] Specifically, the air source heat pump 2 includes a second condenser 21, a second compressor 22, a second evaporator 23 and a second throttle valve 24. The second condenser 21, the second compressor 22, the second evaporator 23 and the second throttle valve 24 are connected through a second circulation pipeline 26; the second condenser 21 exchanges heat with the second hot water return pipeline 251 and the second hot water supply pipeline 252, so as to transfer the heat generated by the refrigeration of the air source heat pump 2 to the drying area 4.

[0034] This arrangement ensures that when the cooling demand in the office and living area is insufficient, the hot water return is driven by the second water pump 502, enters the second condenser 21 through the second hot water return pipe 251, and after heating is completed, flows to the hot water tank 31 through the second hot water supply pipe 252 to replenish the hot water in the energy storage tank 3, thereby ensuring the heat demand in the drying area 4.

[0035] Specifically, the energy storage water tank 3 includes a hot water tank 31 and a return water tank 32. The hot water tank 31 is provided with a first temperature sensor 601, and the return water tank 32 is provided with a second temperature sensor 602. This configuration ensures that when the drying area 4 is working, the energy storage water tank 3 has sufficient hot water, and by monitoring the temperature change of the hot water, the heating process is reasonably controlled to meet the heat demand under various working conditions, thereby avoiding insufficient heat supply caused by fluctuations in the cooling demand of the office and living area, which affects the drying effect.

[0036] Specifically, the water inlet of the hot water tank 31 is connected to the air-cooled heat pump 1 via the first hot water supply pipeline 152, and the water inlet of the hot water tank 31 is connected to the air source heat pump 2 via the second hot water supply pipeline 252. The first hot water supply pipeline 152 and the second hot water supply pipeline 252 are provided with independently controlled third stop valves 311 and fourth stop valves 312; the water outlet of the hot water tank 31 is connected to the fan water inlet pipeline 431 of the drying area 4, and the fan water inlet pipeline 431 is provided with a seventh stop valve 313.

[0037] By setting the stop valves on each pipeline, the system can control the water inlet and outlet of the hot water tank 31, maintain the stability of the hot water volume inside the hot water tank 31, ensure the smooth operation of the drying area 4, which is beneficial to improving the heat utilization rate of the dryer and environmental protection, and reducing production costs.

[0038] Specifically, the water outlet of the return water tank 32 is connected to the air-cooled heat pump 1 via the first hot water return pipe 151, and the water outlet of the return water tank 32 is connected to the air source heat pump 2 via the second hot water return pipe 251. The first hot water return pipe 151 and the second hot water return pipe 251 are provided with independently controlled fifth stop valves 321 and sixth stop valves 322; the water inlet of the return water tank 32 is connected to the fan return pipe 432 of the drying area 4, and the fan return pipe 432 is provided with an eighth stop valve 323.

[0039] By controlling the opening and closing of the stop valve, the water to be heated in the return water tank 32 can be controlled to pass through one or all of the air-cooled heat pump 1 and the air source heat pump 2, thereby heating the stored water. After the heating is completed, it flows into the hot water tank 31, which can effectively play the function of the air-cooled heat pump 1 pipeline, reduce energy consumption, and realize the refined control of each pipeline. The various circuits of the dryer operate smoothly, which is beneficial to improving the heat utilization rate and environmental protection of the dryer and reducing production costs.

[0040] Specifically, a heat dissipation coil 41 is provided in the drying area 4 , the water inlet end of the heat dissipation coil 41 is connected to the fan water inlet pipeline 431 , the water outlet end of the heat dissipation coil 41 is connected to the fan water return pipeline 432 , and a fan 42 is provided on one side of the heat dissipation coil 41 .

[0041] This arrangement enables hot water to be driven by the third water pump 503, enter the heat dissipation coil 41 through the fan water inlet pipe 431, and be driven by the fan 42 to send the heat in the heat dissipation coil 41 into the drying area 4, and then enter the return water tank 32 through the fan return water pipe 432, thereby improving the drying efficiency in the drying area 4.

[0042] Specifically, a third temperature sensor 603 is provided in the drying area 4. This arrangement is conducive to temperature control in the drying area 4, so that the dryer operates within a reasonable temperature range, meets the drying needs of products such as grain, tobacco, fruits and vegetables, improves drying efficiency, and achieves a good drying effect.

[0043] Specifically, the water pump 5 includes a first water pump 501, a second water pump 502, and a third water pump 503. The first water pump 501 is arranged on the first hot water return pipe 151, the second water pump 502 is arranged on the second hot water return pipe 251, and the third water pump 503 is arranged on the fan water inlet pipe 431. The first water pump 501, the second water pump 502, and the third water pump 503 are all variable frequency water pumps. This arrangement can realize the precise control of the water flow in each circuit, which is conducive to improving the overall efficiency of the drying system, reducing the operating cost, and saving energy.

[0044] Specifically, a heat-insulating layer is arranged outside the connecting pipeline 7. This arrangement is conducive to further saving energy and reducing waste.

[0045] Example 2

[0046] When multiple drying areas 4 are provided, the hot water tank 31 can be provided with multiple outlets, each outlet is controlled by a separate ninth stop valve 314, etc., and each drying area 4 is provided with a temperature sensor 6, which can realize a single drying area working alone or multiple drying areas working simultaneously, and meet various drying requirements. At the same time, the return water tank 32 is provided with multiple water inlets, and each water inlet is separately provided with a tenth stop valve 324, etc.

[0047] This arrangement is conducive to setting up multiple drying areas 4 according to the actual needs of the factory and products, etc., which can realize the drying of various types of products and meet the temperature requirements for drying different types of products. At the same time, it is convenient to install drying equipment according to actual conditions to achieve good drying effects.

[0048] It should be noted that all terms used in the present invention for directional and positional indications, such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "inner", "outer", "top", "lower", "head end", "tail end", "center", etc., are only used to explain the relative positional relationship and connection conditions between the components in a certain state, and are only for the convenience of describing the present invention, rather than requiring the present invention to be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features.

[0049] Although the utility model is disclosed as above, the utility model is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model. Therefore, the protection scope of the utility model shall be subject to the scope defined by the claims.

Claims

1. A dual-heat source full heat recovery heat pump drying system, comprising an air source heat pump (2), an energy storage water tank (3), a water pump (5) and at least one drying area (4), characterized in that: The system further comprises an air-cooled heat pump (1), wherein the air-cooled heat pump (1) is arranged in parallel with the air-source heat pump (2) and is connected to the energy storage water tank (3), wherein the energy storage water tank (3) is connected to at least one of the drying areas (4), and the air-source heat pump (2), the air-cooled heat pump (1), the energy storage water tank (3) and the drying area (4) are connected via a connecting pipe (7), and a water pump (5) is arranged on the connecting pipe (7) for driving the energy storage water tank (3) circulating flow of water; the air-cooled heat pump (1) is externally connected to a first hot water return pipeline (151) and a first hot water supply pipeline (152), and is used to transfer the heat generated by the refrigeration of the air-cooled heat pump (1) to the drying area (4) through a connecting pipeline (7); the air-cooled heat pump (1) is also externally connected to a cold water return pipeline (181) and a cold water supply pipeline (182), and is used to transfer the cold generated by the refrigeration of the air-cooled heat pump (1) to the office and living area.

2. A dual-heat-source full-heat recovery heat pump drying system according to claim 1, characterized in that: The air-cooled heat pump (1) comprises a first evaporator (11), a first compressor (12), a first throttle valve (14), and a first condenser (13); the first evaporator (11), the first compressor (12), the first throttle valve (14), and the first condenser (13) are connected via a first circulation pipeline (16).

3. A dual-heat-source full-heat recovery heat pump drying system according to claim 2, characterized in that: The air-cooled heat pump (1) also includes a heat recovery device (17), wherein the first condenser (13) and the heat recovery device (17) are arranged in parallel, wherein the first circulation pipeline (16) includes a condenser branch (161) and a heat recovery device branch (162), wherein the condenser branch (161) is provided with a first stop valve (191), and the heat recovery device branch (162) is provided with a second stop valve (192); the first evaporator (11) exchanges heat with the cold water return pipeline (181) and the cold water supply pipeline (182) to transfer the cold energy generated by the refrigeration of the air-cooled heat pump (1) to the office and living area; the heat recovery device (17) exchanges heat with the first hot water return pipeline (151) and the first hot water supply pipeline (152) to transfer the heat generated by the refrigeration of the air-cooled heat pump (1) to the drying area (4).

4. A dual-heat-source full-heat recovery heat pump drying system according to claim 1, characterized in that: The air source heat pump (2) comprises a second condenser (21), a second compressor (22), a second evaporator (23) and a second throttle valve (24); the second condenser (21), the second compressor (22), the second evaporator (23) and the second throttle valve (24) are connected via a second circulation pipeline (26); the second condenser (21) exchanges heat with a second hot water return pipeline (251) and a second hot water supply pipeline (252) to transfer the heat generated by the refrigeration of the air source heat pump (2) to the drying area (4).

5. A dual-heat-source full-heat recovery heat pump drying system according to claim 4, characterized in that: The energy storage water tank (3) comprises a hot water tank (31) and a return water tank (32); the hot water tank (31) is provided with a first temperature sensor (601), and the return water tank (32) is provided with a second temperature sensor (602).

6. A dual-heat-source full-heat recovery heat pump drying system according to claim 5, characterized in that: The water inlet of the hot water tank (31) is connected to the air-cooled heat pump (1) via the first hot water supply pipeline (152), and the water inlet of the hot water tank (31) is connected to the air-source heat pump (2) via the second hot water supply pipeline (252). The first hot water supply pipeline (152) and the second hot water supply pipeline (252) are provided with independently controlled third stop valves (311) and fourth stop valves (312); the water outlet of the hot water tank (31) is connected to the fan water inlet pipeline (431) of the drying area (4), and the fan water inlet pipeline (431) is provided with a seventh stop valve (313).

7. A dual-heat-source full-heat recovery heat pump drying system according to claim 6, characterized in that: The water outlet of the return water tank (32) is connected to the air-cooled heat pump (1) via the first hot water return water pipeline (151), and the water outlet of the return water tank (32) is connected to the air-source heat pump (2) via the second hot water return water pipeline (251). The first hot water return water pipeline (151) and the second hot water return water pipeline (251) are provided with an independently controlled fifth stop valve (321) and a sixth stop valve (322); the water inlet of the return water tank (32) is connected to the fan return water pipeline (432) of the drying area (4), and the fan return water pipeline (432) is provided with an eighth stop valve (323).

8. A dual-heat-source full-heat recovery heat pump drying system according to claim 7, characterized in that: A heat dissipation coil (41) is provided in the drying area (4); a water inlet end of the heat dissipation coil (41) is connected to the fan water inlet pipeline (431); a water outlet end of the heat dissipation coil (41) is connected to the fan water return pipeline (432); and a fan (42) is provided on one side of the heat dissipation coil (41).

9. A dual-heat-source full-heat recovery heat pump drying system according to claim 8, characterized in that: The drying area (4) is provided with a third temperature sensor (603) for detecting the temperature in the drying area (4).

10. A dual-heat-source full-heat recovery heat pump drying system according to claim 8, characterized in that: The water pump (5) comprises a first water pump (501), a second water pump (502), and a third water pump (503); the first water pump (501) is arranged on the first hot water return pipeline (151); the second water pump (502) is arranged on the second hot water return pipeline (251); the third water pump (503) is arranged on the fan water inlet pipeline (431); the first water pump (501), the second water pump (502), and the third water pump (503) are all variable frequency water pumps.

Images