CN214747124U

CN214747124U - Multi-heat-source drying system

Info

Publication number: CN214747124U
Application number: CN202022876755.1U
Authority: CN
Inventors: 曾智勇; 梁荣; 张增添
Original assignee: Enesoon Shenzhen High End Intelligent Equipment Co ltd
Current assignee: Enesoon Shenzhen High End Intelligent Equipment Co ltd
Priority date: 2020-12-04
Filing date: 2020-12-04
Publication date: 2021-11-16
Anticipated expiration: 2030-12-04

Abstract

The utility model discloses a many heat sources drying system, include: the system comprises a drying chamber, a control unit, a solar heating device, an energy storage device and a heat pump heating device; a heat exchange device and a circulating fan are arranged in the drying chamber, and the solar heating device, the energy storage device and the heat pump heating device are communicated with the heat exchange device; the drying chamber is provided with an exhaust port and an air inlet; the control unit is electrically connected with the solar heating device, the energy storage device, the heat pump heating device and the circulating fan. Clean energy such as solar energy, air energy and electric energy is utilized to heat, zero pollution emission is generated in the operation process of the system, and multiple heating devices are complemented and combined for use, so that the operation cost of the system is reduced. The drying process is automatically controlled by the control unit, the drying requirements of various materials are met, the optimal working condition is realized, the temperature rise and the heat preservation can be ensured, and the humidity and the temperature of the drying chamber can be adjusted according to the change of the drying process requirements.

Description

Multi-heat-source drying system

Technical Field

The utility model relates to a drying system technical field especially relates to a many heat sources drying system.

Background

The existing drying technology mainly comprises: air energy drying, electric heating drying and coal-fired gas-fired boiler drying.

The air can be dried through the heat pump, will place the article in the relatively inclosed heat preservation board room, through the dry wind of closed ground with vapor condensation discharge board room on the cold piece or through opening board room fresh air valve and hydrofuge valve, put into the new trend, the wet air of discharge reaches the purpose of dehumidification drying. However, when the air energy dryer is operated, the temperature rise is slow at low temperature, the air side heat exchanger is easy to frost, the power consumption is high, the energy efficiency ratio is low, the long-time operation is required, and the intermediate down time is short. For some extremely cold areas in winter in the north, the solar energy-saving water heater can not be started to operate or can only operate with low energy efficiency ratio. When the unit operates at the temperature of more than 70 ℃ for a long time, the overall performance of the unit is influenced. The air energy drying unit is applied to the prior art, and still has the defects of low energy efficiency during low-temperature drying and easy frosting of a heat exchanger. And when drying at normal temperature, the improvement of energy-saving capability is limited due to the whole system factor.

The electric heating drying utilizes the heat emitted by power supply heating through the principle of heat exchange, and the materials in the closed heat insulation box are gradually dried through a thermal cycle process generated by continuous air suction of the air draft fan. However, the energy efficiency ratio of electric heating drying is far lower than that of an air energy drying system; and the heat is directly discharged into the air, and the energy loss is serious.

The coal-fired gas-fired boiler dries and releases heat through burning the coal cinder or gas and adds hot water, and high temperature hot water or steam after the heating are sent into the heat exchanger through the pipeline and then return the boiler heating again, and the continuous circulation uses axial fan constantly to blow the air through the heat exchanger, and the air is sent into the drying chamber through the wind channel after being heated and is dried the material, and humid air then discharges the drying chamber through the exhaust duct. However, the coal-fired gas-fired boiler has low heat energy utilization rate and high pollution; and the cost is high and the technology is immature.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

An object of the utility model is to the not enough of above-mentioned prior art, provide one kind and carry out reasonable combination to multiple heating device as required and provide the multi-heat source drying system of heat energy for the drying chamber.

(II) technical scheme

In order to solve the above problem, the utility model provides a many heat sources drying system, include: the system comprises a drying chamber, a control unit, a solar heating device, an energy storage device and a heat pump heating device; a heat exchange device and a circulating fan are arranged in the drying chamber, and the solar heating device, the energy storage device and the heat pump heating device are communicated with the heat exchange device; the drying chamber is provided with an exhaust port and an air inlet; the control unit is electrically connected with the solar heating device, the energy storage device, the heat pump heating device and the circulating fan.

Optionally, the heat exchange device includes a first heat exchange device and a second heat exchange device, the first heat exchange device is communicated with the solar heating device and the energy storage device, and the second heat exchange device is communicated with the heat pump heating device.

Optionally, the multi-heat source drying system further comprises a heat energy recovery device, wherein the heat energy recovery device comprises a heat exchanger, and the heat exchanger is communicated with the drying chamber through the air outlet and the air inlet.

Optionally, the heat pump heating device comprises an air source heating device and/or a sewage source heating device.

Optionally, the solar heating device comprises a solar heat collector and a water storage tank, and the water storage tank is communicated with the first heat exchange device.

Optionally, the control unit is configured to select heating using the solar heating device and/or the energy storage device and/or the heat pump heating device according to a heat demand of the drying chamber.

Optionally, the control unit further includes a power supply, and the power supply provides electric energy for the solar heating device, the energy storage device, the heat pump heating device, and the circulating fan.

Optionally, a temperature sensor and a humidity sensor are arranged in the drying chamber, and the temperature sensor and the humidity sensor send collected temperature data and humidity data to the control unit.

Optionally, temperature sensors are arranged in the solar heating device, the energy storage device and the heat pump heating device, and the temperature sensors send collected temperature data of heat transfer media in the heating devices to the control unit.

Optionally, the solar heat collector further comprises a circulating water pump and an electromagnetic valve, wherein the circulating water pump and the electromagnetic valve are arranged on pipelines which are connected with the solar heating device, the energy storage device and the first heat exchange device.

(III) advantageous effects

The utility model provides a many heat sources drying system utilizes clean energy such as solar energy, air ability and electric energy to heat, and zero pollutant discharge in the system operation process, multiple heating device is complementary and the combined use has reduced the system operation cost. The heating device in the system can store heat energy, and can continuously and stably supply heat to the drying chamber even under extreme weather conditions. The energy storage system can reduce the defrosting time of the heat pump and reduce the power consumption of the system. The heating device is separated from the drying chamber, and the heat energy recovery device can also discharge damp and hot air and recover waste heat, so that the air for drying is only circulated in the drying chamber, and the system only needs to provide heat for material heating and heat dissipation of the curing barn. Therefore, the system power consumption is greatly reduced. In addition, the hot air circulates in the drying chamber completely, so that the dehumidifying heat is recovered, the loss of beneficial substances of the materials in the dehumidifying process is greatly reduced, and the drying quality of the materials is improved. The system adopts a plurality of heating device temperature-rising strategies, so that each heating device can ensure the best working condition, the heat efficiency is high, the temperature rise of the system can be ensured, and the service life of the system is long. The drying process is automatically controlled by the control unit, and the drying requirements of various materials are met. The control unit comprehensively controls each component in the system, realizes the optimal working condition, ensures the functions of temperature rise, heat preservation, moisture discharge and moisture preservation, and ensures that the humidity and the temperature of the drying chamber can be adjusted according to the change of the drying process requirement.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

Fig. 1 is a schematic structural view of a multi-heat source drying system in an embodiment of the present invention.

The reference numbers in the drawings are, in order:

1. the solar heat recovery system comprises a drying chamber, 101, an inner wall, 2, a control unit, 3, a solar heating device, 301, a solar heat collector, 302, a water storage tank, 4, an energy storage device, 5, a heat pump heating device, 6, a heat energy recovery device, 601, a heat exchanger, 602, an air inlet pipe, 603, an exhaust pipe, 7, a first heat exchange device, 8, a second heat exchange device, 9, a circulating fan, 10, a first electromagnetic valve, 11, a second electromagnetic valve, 12, a third electromagnetic valve, 13, a circulating water pump, 14, an air inlet valve, 15 and an exhaust valve.

Detailed Description

The following describes the present invention in further detail with reference to the following embodiments and the accompanying drawings. The following examples of the present invention are provided to illustrate the present invention, but are not intended to limit the scope of the present invention.

As shown in fig. 1, an embodiment of the utility model provides a multi-heat source drying system, include: the system comprises a drying chamber 1, a control unit 2, a solar heating device 3, an energy storage device 4, a heat pump heating device 5 and a heat energy recovery device 6. A first heat exchange device 7, a second heat exchange device 8, and a circulating fan 9 are arranged in the drying chamber 1. The solar heating device 3 and the energy storage device 4 are communicated with the first heat exchange device 7, and the heat pump heating device 5 is communicated with the second heat exchange device 8. The drying chamber 1 is provided with an exhaust port and an air inlet, and the heat energy recovery device 6 is communicated with the drying chamber 1 through the exhaust port and the air inlet. The control unit 2 is electrically connected to the solar heating apparatus 3, the energy storage apparatus 4, the heat pump heating apparatus 5, the heat recovery apparatus 6, and the circulation fan 9. The control unit 2 further comprises a power supply which supplies electric energy to the solar heating device 3, the energy storage device 4, the heat pump heating device 5, the heat energy recovery device 6 and the circulating fan 9.

In this embodiment, as shown in fig. 1, a plurality of layers of platforms or shelves for placing the drying object are arranged in the drying chamber 1 from top to bottom, an inner wall 101 is arranged on the left side of the drying chamber 1, and a circulating fan 9, a first heat exchange device 7 and a second heat exchange device 8 are sequentially arranged between the inner wall 101 and the left side wall of the drying chamber 1 from top to bottom. In this embodiment, the first heat exchange device 7 and the second heat exchange device 8 are both fin heat exchangers. The top end and the bottom end of the right side wall of the drying chamber 1 are respectively provided with an exhaust port and an air inlet, an exhaust valve 15 is installed on the exhaust port, and an air inlet valve 14 is installed on the air inlet. After the circulation fan 9 is started, the air in the drying chamber 1 is driven to circularly flow as the path shown by the arrow in fig. 1. In the circulation process, the air absorbs the heat of the high-temperature heat transfer medium in the heat exchange device to be heated when flowing through the first heat exchange device 7 and the second heat exchange device 8. The heated air dries the drying object while flowing through the drying object. A temperature sensor and a humidity sensor are arranged in the drying chamber 1, and the temperature sensor and the humidity sensor send collected temperature data and humidity data in the drying chamber 1 to the control unit 2.

In this embodiment, a solar heating device 3 using water as a heat transfer medium is disposed on the top of the drying chamber 1, and includes a solar heat collector 301 and a water storage tank 302. As shown in fig. 1, the upper part of the water storage tank 302 is communicated with the solar heat collector 301; the solar heat collector 301 is connected with an inlet of the waterway fin heat exchanger as the first heat exchange device 7 through a pipeline. The lower part of the water storage tank 302 is connected with the outlet of the finned heat exchanger through a pipeline, and a first electromagnetic valve 10 and a circulating water pump 13 are arranged on the pipeline and are respectively used for controlling the flow speed and the flow of water and providing power for the circulation of the water. The water in the water storage tank 302 flows into the solar heat collector 301, is heated by solar energy, and is sent to the waterway fin heat exchanger through a pipeline to perform indirect heat exchange with the air in the drying chamber 1. Then, the water flows out from the outlet of the waterway fin heat exchanger, enters the circulating water pump 13 through a pipeline, and returns to the water storage tank 302 through the first electromagnetic valve 10, so that one circulation is completed. The water then flows from the storage tank 302 into the solar collector 301 for the next cycle. A temperature sensor is arranged in the solar collector 301 for acquiring temperature data of the water in the solar collector 301 and sending the temperature data to the control unit 2. The control unit 2 is electrically connected to the first solenoid valve 10 and the circulating water pump 13, and is capable of controlling start/stop and operation thereof.

Solar photo-thermal energy is a free renewable energy source, and the running cost of the system can be reduced when the system is operated in a period of sufficient solar illumination. Besides water, other fluids may be used as the heat transfer medium of the solar heating apparatus 3, and the embodiment of the present invention is not limited thereto.

As shown in fig. 1, the control unit 2 is electrically connected to the energy storage device 4, and provides electric energy to the energy storage device 4 for heating the phase change energy storage material disposed in the energy storage device 4 to store heat in the energy storage device 4; and also controls the start/stop and operation of the energy storage device 4. In this embodiment, the energy storage tank 4 uses water as a heat transfer medium, and a temperature sensor is arranged in the energy storage device 4, and is used for acquiring temperature data of the phase change energy storage material and the water in the energy storage device 4, and sending the temperature data to the control unit 2. The energy storage device 4 is connected with an inlet of the waterway fin heat exchanger through a pipeline provided with a second electromagnetic valve 11, and water heated by the heat energy stored in the energy storage device 4 is conveyed into the waterway fin heat exchanger to carry out indirect heat exchange with the air in the drying chamber 1; then, the water flows out from the outlet of the waterway fin heat exchanger, enters the circulating water pump 13 through a pipeline, and enters the energy storage device 4 through a pipeline provided with a third electromagnetic valve 12, so that one circulation is completed. Then, the water flows into the waterway fin heat exchanger through the energy storage device 4, and enters the next circulation. The control unit 2 is electrically connected to the second electromagnetic valve 11 and the third electromagnetic valve 12, and controls the start/stop and operation thereof. Indirect heat exchange is performed between the phase change energy storage material in the energy storage device 4 and water as a heat transfer medium.

In this embodiment, the solar heating device 3 and the energy storage device 4 both use water as a heat transfer medium, and therefore the first heat exchange device 7 connected to the solar heating device 3 and the energy storage device 4 is a water channel fin heat exchanger. When the solar heating device 3 and the energy storage device 4 use other fluids as heat transfer media, heat exchangers of corresponding types can be adopted, and the embodiment of the present invention is not particularly limited to this.

As shown in fig. 1, the control unit 2 is electrically connected to the heat pump heating device 5, and supplies electric energy to the heat pump heating device 5, and compresses refrigerant (for example, fluorine) in the heat pump heating device 5 into high-temperature and high-pressure gas by starting a compressor in the heat pump heating device 5, and transmits the gas to the second heat exchange device 8 through a pipeline to perform indirect heat exchange with air in the drying chamber 1. The control unit 2 also controls the start/stop and operation of the heat pump heating apparatus 5. A temperature sensor is provided in the heat pump heating device 5, and is configured to collect temperature data of fluorine in the heat pump heating device 5 and can transmit the temperature data to the control unit 2. The heat pump heating device 5 is connected with the inlet and the outlet of the fluorine path fin heat exchanger as the second heat exchange device 8 through two pipelines respectively. Fluorine of the heat pump heating device 5 flows into the fluorine path fin heat exchanger through a pipeline after being heated, and indirectly exchanges heat with air in the drying chamber 1; then, the water flows out from the outlet of the fluorine path fin heat exchanger and flows back to the heat pump heating device 5, and the primary circulation is completed. Then, the fluorine flows into the fluorine path fin heat exchanger from the heat pump heating apparatus 5, and enters the next cycle.

As shown in fig. 1, a heat energy recovery device 6 is provided at the right side of the drying chamber 1, the heat energy recovery device 6 is communicated with the drying chamber 1 through an exhaust port and an intake port, an exhaust valve 15 is provided at the exhaust port, and an intake valve 14 is provided at the intake port. The heat energy recovery device 6 comprises a heat exchanger 601, wherein the left side of the heat exchanger 601 is provided with two air pipes which are respectively communicated with an air outlet and an air inlet of the drying chamber 1; two pipes are provided on the right side of the heat exchanger 601, one is an intake pipe 602 for sucking in new air, and the other is an exhaust pipe 603 for exhausting humid air in the drying chamber 1. The control unit 2 is electrically connected to the heat exchanger 601, the exhaust valve 15, and the intake valve 14, and controls the start/stop and operation thereof. When the control unit 2 detects that the humidity in the drying chamber 1 reaches a set humidity value through a humidity sensor arranged in the drying chamber 1, the control unit 2 starts the heat exchanger 601 and opens the air inlet valve 14 first, so that the air inlet pipe 602 connected with the heat exchanger 601 sucks new air and conveys the new air to the heat exchanger 601; the exhaust valve 15 is opened again so that the hot and humid air in the drying chamber 1 enters the heat exchanger 601 through the air duct connected to the exhaust port. The hot humid air exchanges heat with the new air sucked in the heat exchanger 601, transfers heat to the new air sucked in, and is discharged from the exhaust pipe 603; the heated fresh air enters the drying chamber 1 through the air inlet. When the control unit 2 detects that the humidity in the drying chamber 1 is lower than the set humidity, the exhaust valve 15 is closed first, and then the intake valve 14 is closed, thereby completing the dehumidification process. When the control unit 2 detects again that the humidity in the drying chamber 1 reaches the set humidity, the heat exchanger 601 is started again, and the intake valve 14 and the exhaust valve 15 are opened to proceed to the next exhaust process.

Use the embodiment of the utility model provides an in during multi-heat source drying system, start control unit 2, control unit 2 acquires the temperature data and the humidity data that set up the temperature sensor and humidity transducer collection in drying chamber 1 to start circulating fan 9 and make the air circulation in drying chamber 1 flow. Meanwhile, the control unit 2 also obtains temperature data of the corresponding heat transfer media collected by temperature sensors arranged in the solar heating device 3, the energy storage device 4 and the heat pump heating device 5. To determine the temperature of the water in the solar heating means 3 and the energy storage means 4, and the temperature of the fluorine in the heat pump heating means 5 at the present moment. The temperature sensors and the humidity sensors arranged in the drying chamber 1 and the temperature sensors arranged in the heating devices can transmit the collected temperature data and humidity data to the control unit 2 in a wired or wireless mode; also, data may be collected at set time intervals, for example, every 10 seconds. The embodiment of the present invention is not limited to this embodiment.

When the temperature in the drying chamber 1 is lower than the set temperature, the control unit 2 starts the solar heating device 3 and/or the energy storage device 4 and/or the heat pump heating device 5, and heats the air in the drying chamber 1 through the first heat exchange device 7 and/or the second heat exchange device 8.

The control unit 2 sets the energy storage device 4 to heat the phase change energy storage material in the energy storage device 4 with electric energy for a set period of time. For example, the energy storage is set to utilize valley electricity in a time period when the electricity fee is relatively low at night, the heat energy stored by the phase change energy storage material is used for heating water in the daytime, and the hot water is conveyed to the first heat exchange device to heat the circulating air in the drying chamber. Therefore, the system power consumption cost can be saved.

When the heating device is started, the control unit 2 starts one or a plurality of the solar heating device 3, the energy storage device 4 and the heat pump heating device 5 according to the set conditions.

Specifically, when the temperature in the drying chamber 1 is lower than a set temperature, the control unit 2 determines whether the current temperature of the heat transfer medium in each heating device meets the set temperature according to the temperature data acquired by the temperature sensors in the solar heating device 3, the energy storage device 4 and the heat pump heating device 5;

if the temperatures of the heat transfer media in the solar heating device 3, the energy storage device 4 and the heat pump heating device 5 all accord with the set temperature, the solar heating device 3 is started firstly, then the energy storage device 4 is started, and finally the heat pump heating device 5 is started;

if only part of the temperatures of the heat transfer media in the solar heating device 3, the energy storage device 4 and the heat pump heating device 5 meet the set temperature, starting the devices meeting the temperature requirements according to the starting sequence;

if the heat energy provided by any one of the solar heating device 3, the energy storage device 4 and the heat pump heating device 5 is insufficient when the solar heating device is started, a plurality of devices which meet the temperature condition among the solar heating device 3, the energy storage device 4 and the heat pump heating device 5 can be started simultaneously according to the starting sequence.

When the humidity in the drying chamber 1 is higher than the set humidity, the control unit 2 activates the heat energy recovery device 6, discharges the hot and humid air in the drying chamber 1, inputs new air into the drying chamber 2, and transfers the heat of the discharged hot and humid air to the input new air in the heat exchanger 601. The control unit 2 determines whether to activate the thermal energy recovery device 6 according to humidity data transmitted from a humidity sensor provided in the drying chamber 1.

The heating process and the process of discharging the hot and humid air described above may be performed simultaneously. The above process is continuously circulated until the drying object in the drying chamber 1 is dried to a desired state.

Use the embodiment of the utility model provides an in many heats source drying system stoving tobacco leaf for the example. It can be seen that, by referring to the data in the following table, the cost is significantly reduced by adopting the multi-heat source drying system of the utility model, which is less than half of the traditional coal-fired technology. In the aspect of social benefit, compared with the traditional coal-fired baking, the emission of CO can be reduced by 3800kg of tobacco leaves in one furnace₂About 1120.06kg, reduced SO emissions₂About 67.9kg, and the emission of NOx is reduced by 33.9 kg. The economic benefit and the social benefit are very obvious.

The utility model provides a many heat sources drying system utilizes clean energy such as solar energy, air ability and electric energy to heat, and zero pollutant discharge in the system operation process, the complementary and rational utilization of multiple energy has reduced the system operation cost. The energy storage device in the system can store heat energy, and can continuously and stably supply heat to the drying chamber even under extreme weather conditions. The energy storage system can reduce the defrosting time of the heat pump and reduce the power consumption of the system. The heating device and the heat storage device are arranged separately from the drying chamber, and the heat energy recovery device can also discharge damp and hot air and recover waste heat, so that the air for drying is only circulated in the drying chamber, and the system only needs to provide heat for material heating and heat dissipation of the curing barn. Therefore, the system power consumption is greatly reduced. In addition, the hot air circulates in the drying chamber completely, so that the dehumidifying heat is recovered, the loss of beneficial substances of the materials in the dehumidifying process is greatly reduced, and the drying quality of the materials is improved. The system adopts a strategy of heating by a plurality of heating devices, and each heating device can independently operate and is not influenced mutually, so that each heating device can ensure the best working condition, the heat efficiency is high, the system can be ensured to heat, and the service life of the system is long. The drying process can be automatically controlled by the control unit, and the drying requirements of various materials are met. The control unit comprehensively controls each component in the system, realizes the optimal working condition, ensures the functions of temperature rise, heat preservation, moisture discharge and moisture preservation, and ensures that the humidity and the temperature of the drying chamber can be adjusted according to the change of the drying process requirement.

In the present invention, the terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, and are only the terms determined for convenience of describing the structural relationship of each component or element of the present invention, and are not specific to any component or element of the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. To those skilled in the art, the specific meaning of the above terms in the present invention can be understood in specific cases, and should not be construed as limiting the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The above embodiments are merely illustrative, and not restrictive, of 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 various combinations, modifications or equivalent substitutions may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all of the technical solutions should be covered by the scope of the claims of the present invention.

Claims

1. A multi-heat source drying system is characterized by comprising: the system comprises a drying chamber, a control unit, a solar heating device, an energy storage device and a heat pump heating device;

a heat exchange device and a circulating fan are arranged in the drying chamber, and the solar heating device, the energy storage device and the heat pump heating device are communicated with the heat exchange device;

the drying chamber is provided with an exhaust port and an air inlet;

the control unit is electrically connected with the solar heating device, the energy storage device, the heat pump heating device and the circulating fan.

2. The multi-heat-source drying system of claim 1, wherein the heat exchanging device comprises a first heat exchanging device and a second heat exchanging device, the first heat exchanging device is communicated with the solar heating device and the energy storage device, and the second heat exchanging device is communicated with the heat pump heating device.

3. A multi-heat-source drying system according to claim 1, further comprising a heat energy recovery device in communication with the drying chamber through the air outlet and the air inlet.

4. A multi-heat-source drying system according to claim 1, wherein the heat pump heating device comprises an air-source heating device and/or a sewage-source heating device.

5. A multi-heat-source drying system according to claim 2, wherein the solar heating device comprises a solar heat collector and a water storage tank, and the water storage tank is communicated with the first heat exchanging device.

6. A multi-heat-source drying system according to claim 1, wherein the control unit is configured to select heating using the solar heating device and/or the energy storage device and/or the heat pump heating device according to a heat demand of the drying chamber.

7. The multi-heat-source drying system of claim 3, wherein the control unit further comprises a power supply that provides electrical energy to the solar heating device, the energy storage device, the heat pump heating device, the heat energy recovery device, and the circulating fan.

8. The multi-heat-source drying system according to claim 1, wherein a temperature sensor and a humidity sensor are arranged in the drying chamber, and the temperature sensor and the humidity sensor transmit collected temperature data and humidity data to the control unit.

9. The multi-heat-source drying system of claim 1, wherein temperature sensors are disposed in the solar heating device, the energy storage device and the heat pump heating device, and the temperature sensors transmit collected temperature data of heat transfer media in the heating devices to the control unit.

10. The multi-heat-source drying system of claim 2, further comprising a circulating water pump and a solenoid valve, wherein the circulating water pump and the solenoid valve are arranged on a pipeline connecting the solar heating device and the energy storage device with the first heat exchange device.