A container drying system based on a heat pump distributed cluster and a control method thereof

Abstract

The application relates to a container drying system based on a heat pump distributed cluster and a control method, wherein the container drying system based on the heat pump distributed cluster comprises a tunnel type container drying tunnel, a peripheral carrier refrigerant heat exchange loop and a plurality of refrigeration heat pump units; the peripheral carrier refrigerant heat exchange loop is peripherally arranged outside the tunnel type container drying tunnel; the plurality of refrigeration heat pump units are arranged along the tunnel type container drying tunnel, and the plurality of refrigeration heat pump units are in heat exchange type connection with the peripheral carrier refrigerant heat exchange loop. Compared with the prior art, the application provides the container drying system and the control method which have high reliability, load balance, good expansibility, good applicability, good energy saving property and are convenient to maintain, and are favorable for improving the overall industry level and competitiveness of containers.

Description

TECHNICAL FIELD

[0001] The present application relates to a container drying system, in particular to a container drying system of a heat pump distributed cluster and a control method. BACKGROUND

[0002] A container is a standardized metal box used for transporting and storing goods. It has the characteristics of convenience and speed, and is widely used in different fields of freight transportation, energy storage, prefabricated buildings and facility agriculture. Containers have a wide range of applications in the Chinese market and play an important role in domestic and foreign trade and the logistics industry.

[0003] The coating and drying process of the container is an important process in production, which can improve the quality and service life of the container. Usually, the container is sprayed with primer, intermediate paint and topcoat. The function of primer is to enhance the adhesion and corrosion resistance of the surface, and the topcoat can enhance the appearance and weather resistance of the container surface. After coating, the container is placed in a drying room, and a high-temperature drying device is used to completely dry the surface to ensure that the coating can be firmly attached to the surface of the container.

[0004] The container paint drying process currently basically adopts a natural gas combustion heating drying process. The container enters from one side of the drying channel, moves uniformly in the drying channel, and after the surface paint is dried, it slides out from the other side to enter the next process. The drying channel is equipped with several natural gas hot air boilers and circulating fans to maintain a relatively uniform medium-high temperature environment (40-60℃) inside, so that the moisture on the surface of the container evaporates. When the relative humidity in the drying channel is detected to be too high, the dehumidification fan is turned on to exhaust hot and humid air, replace an equal amount of fresh air, and continue to dry by reheating.

[0005] The energy utilization rate of the traditional scheme of the above-mentioned hot air furnace heating + dehumidification fan dehumidification is not high, and there is a lot of heat dissipation, resulting in high energy consumption per container. The main heat loss channels include: (1) water vapor evaporated from the surface paint of the container contains a large amount of latent heat of vaporization, which is discharged through the dehumidification fan, so that this part of heat is completely discharged into the atmosphere and is not utilized; (2) the weight of a single container is as high as 2-4 tons, made of steel, with high heat capacity, and the temperature difference between the container entering and leaving the drying channel is more than 30℃, so there is a large heat capacity heat loss; (3) the air around the container when it enters and leaves the drying channel, as well as the air carried by the container itself, also acts like a dehumidification fan, representing part of the exhaust heat loss.

[0006] As a kind of high-efficiency heat recovery technology, heat pump drying technology has been widely used in many industrial and agricultural fields.For example, patent CN112050618A discloses a heat pump unit suitable for large-volume drying of sea tangle / seaweed, patent CN107130415A discloses a heat pump drying equipment in the field of clothes drying, and so on.However, these existing heat pump drying technologies all assume that the application scenarios have good heat preservation, for example, sea tangle drying is completed in a well-insulated drying room, and the box of clothes drying has good sealing.This condition suitable for the existing heat pump drying technology to play the advantage does not exist in container drying process.As described above, the container drying tunnel will cause a lot of heat dissipation with the entry and exit of the container, and additional heating is needed.Therefore, only relying on the existing heat pump technology cannot realize the internal stable heat and moisture balance.

[0007] Another reason why the existing heat pump drying technology is not suitable for container drying process is that the heat and moisture state distribution of the air inside the container drying tunnel is not uniform, and a unified form or centralized heat pump cannot be used for treatment.For example, the front section of the container drying tunnel is mainly used for rapid preheating of the container, and the rear section is concentrated on the evaporation of moisture on the surface paint of the container.Therefore, the temperature and humidity in the front section space are both low, while the temperature and humidity in the rear section are higher.If the heat pump drying technology is blindly used in the case of low temperature and humidity in the front section, it will result in extremely low energy efficiency and unstable operation state.

[0008] In summary, it is necessary to reform the heat and moisture management system of the container drying process to achieve significant energy saving. SUMMARY

[0009] The purpose of the present application is to overcome the defects of the prior art and provide a container drying system based on heat pump distributed cluster, which provides a container drying system and control method with high reliability, load balancing, good scalability, good applicability, good energy saving and easy maintenance, which is conducive to improving the overall industry level and competitiveness of containers.

[0010] The purpose of the present application can be realized by the following technical solutions:

[0011] The first purpose of the present application is to provide a container drying system based on heat pump distributed cluster, comprising a tunnel type container drying tunnel, a peripheral carrier refrigerant heat exchange loop and a plurality of refrigeration heat pump units, wherein specifically:

[0012] The peripheral carrier refrigerant heat exchange loop is peripherally arranged outside the tunnel type container drying tunnel;

[0013] The plurality of refrigeration heat pump units are arranged along the tunnel type container drying tunnel, and the plurality of refrigeration heat pump units are in heat exchange connection with the peripheral carrier refrigerant heat exchange loop.

[0014] Further, the container tunnel drying oven comprises an inlet and an outlet, and the inlet and the outlet are provided with electric rolling shutter doors, which are opened when the container passes through and closed when no container passes through. When stably running, there are several containers running at a constant speed in the drying oven, and the surfaces of the containers are coated with paint to be dried.

[0015] The outermost periphery of the drying oven is wrapped by the outer peripheral chilled carrier heat exchange loop, which adopts a closed loop and internally circulates the chilled carrier, and the chilled carrier is preferably water in actual application.

[0016] Further, the outer peripheral chilled carrier heat exchange loop is connected in heat exchange mode with the distributed refrigeration heat pump units through the refrigerant-chilled carrier heat exchangers. In the embodiment, the refrigeration heat pump units are connected in heat exchange mode with the inside of the drying oven through the refrigerant-air heat exchangers.

[0017] The refrigeration heat pump units can adopt different unit forms to adapt to the actual situation of the corresponding position. In actual application, a uniform configuration is preferably adopted.

[0018] Further, the refrigeration heat pump units are in the form of a distributed cluster and are arranged as needed along the two sides of the drying oven. A simple implementation is uniform arrangement.

[0019] Further, the refrigeration heat pump units are of a cold and heat dual-purpose type and have two modes of heating and heat and humidity recovery. When the units operate in the heating mode, the units take heat from the outer peripheral chilled carrier heat exchange loop and release heat to the air inside the drying oven. When the units operate in the heat and humidity recovery mode, the units cool and dehumidify the air inside the drying oven to achieve heat and humidity recovery of the sensible heat and latent heat of the air and release heat to the outer peripheral chilled carrier heat exchange loop. The switching of the two modes of the refrigeration heat pump units can be realized by switching of an internal four-way reversing valve to reverse the refrigerant flow path and thus change the heat exchange direction (heat absorption or heat release) in the refrigerant-air heat exchanger.

[0020] The operation process of the container drying heat and humidity management system of the heat pump distributed cluster is as follows: ①The container enters from one end of the drying oven, the moisture on the surface of the container is evaporated into the drying oven after rapid heating and preheating in the front section of the drying oven, and the container exits from the outlet after drying to enter the next process; ②The heat pump unit cluster distributed on the two sides of the drying oven adjusts as needed, and when the units operate in the heating mode, the heat in the outer peripheral chilled carrier heat exchange loop is transferred to the inside of the drying oven to achieve heat supplement to the inside of the drying oven; when the units operate in the heat and humidity recovery mode, the sensible heat of the air inside the drying oven and the vaporization latent heat released by the dehumidification of the air are recovered and then transferred to the outer peripheral chilled carrier heat exchange loop; ③Through the different division of labor of the distributed cluster heat pump units, multi-point heat supplement and heat extraction of the outer peripheral chilled carrier heat exchange loop are realized, and heat balance is maintained to achieve stable operation; similarly, multi-point heat supplement and heat extraction of the drying oven are realized to achieve heat balance in the drying oven; and the dehumidification process accompanying the heat extraction of the drying oven achieves humidity balance with the evaporation of moisture from the container.

[0021] A second object of the present application is to protect a control method of the container drying and heat and humidity management system of the heat pump distributed cluster.

[0022] The control method of the container drying and heat and humidity management system of the heat pump distributed cluster comprises the following steps: ①collecting weather data of the day by the cluster controller, and obtaining return air state data of corresponding locations collected by the units from the distributed heat pump sub-controllers; ②completing iterative update of the internal drying tunnel simulation model of the cluster controller based on the input data; ③calculating the load demand of each point by using the drying tunnel model updated by the data of the last moment, and issuing the load demand to the sub-controllers of the distributed heat pumps at the points; ④determining the operating state of each distributed heat pump sub-controller according to the load demand, specifically, when the wet load in the drying tunnel exceeds the set threshold, the heat and humidity recovery mode is run; when the heat load in the drying tunnel exceeds the set threshold, the heating mode is run.

[0023] The present application also includes another embodiment, which adopts a single mode heat pump unit, and according to the characteristics that the front section of the container tunnel drying tunnel needs to be preheated and rapidly heated, and the rear section needs to be fully dehumidified, the heat pump unit in the heating mode is more arranged in the front half section close to the entrance of the drying tunnel, and the heat pump unit in the heat and humidity recovery mode is more arranged in the rear half section of the drying tunnel. In addition, in order to achieve the heat balance in the rear half section of the drying tunnel, the present embodiment is also indirectly arranged with a plurality of terminal heat exchange devices, which include a carrier refrigerant loop and a circulating fan inside the drying tunnel, and are connected with the peripheral carrier refrigerant loop in a heat exchange mode through a carrier refrigerant-carrier refrigerant heat exchanger.

[0024] The operation process of the another embodiment of the present application is as follows: ①the heat pump unit in the front section of the drying tunnel is in the heating mode, the heat in the peripheral carrier refrigerant heat exchange loop is transferred to the inside of the drying tunnel, the rapid heating of the front section of the drying tunnel is realized, and the containers entering from one end of the drying tunnel are preheated; ②the heat pump unit in the rear section of the drying tunnel is in the heat and humidity recovery mode, the sensible heat of the air inside the drying tunnel and the latent heat released by the dehumidification of the air are recovered and then transferred to the peripheral carrier refrigerant heat exchange loop; ③the indirectly distributed terminal heat exchange device takes heat from the peripheral carrier refrigerant heat exchange loop to supplement the inside of the drying tunnel, especially to maintain the internal air temperature of the rear section of the drying tunnel, and to ensure the rapid precipitation of moisture in the paint on the surface of the container.

[0025] The control method of the another embodiment of the present application is as follows: ①the cluster controller collects weather data of the day, and obtains return air state data of corresponding locations from the sub-controllers of the distributed heat pumps and the terminal heat exchange devices; ②iterative update of the internal drying tunnel simulation model of the cluster controller is completed based on the input data; ③the load rate of each distributed heat pump unit and terminal heat exchange device is obtained by using the drying tunnel model updated by the data of the last moment, and the output degree is determined, and when the value is negative, the unit is closed; otherwise, the compressor speed and / or fan speed of each unit are adjusted according to the load rate.

[0026] Compared with the prior art, the application has the following structural characteristics and beneficial effects:

[0027] 1. High reliability. The distributed heat pump cluster realizes multi-point guarantee for stable and reliable operation of the system. When a node heat pump unit fails, another node heat pump unit takes over the function, and the upper cluster controller quickly completes task redistribution of the lower node unit. At this time, the failed unit can be quickly repaired without affecting the stable operation of the whole.

[0028] 2. Load balancing. The upper cluster controller distributes the overall heat and humidity load in the drying channel to the lower heat pump node units in a reasonable and balanced manner, so that each unit can operate in the high-efficiency range.

[0029] 3. Good scalability. The uniform refrigerant loop distributed along the periphery of the container in the application plays a good role in energy storage, transfer, distribution and balance. The number and installation position of the node devices connected by heat exchange are not limited and can be freely arranged in the required area to maximize the adaptation to the production process conditions.

[0030] 4. Good applicability. Since the form of the uniform refrigerant loop and the arrangement position of the corresponding node devices in the application are not restricted, the application can be easily adjusted for container drying processes with certain differences (such as dry cargo containers and refrigerated containers), and the connection position of the node heat pump unit can be changed as needed.

[0031] 5. Good energy saving. The distributed cluster heat and humidity management system based on heat pump heat recovery technology in the application recovers and rebalances the heat of the overall drying channel, greatly reducing the energy loss caused by exhaust and humidity removal and container entry and exit in traditional schemes. The overall scheme has good energy saving and technical economy.

[0032] 6. Easy maintenance. The application sets a uniform refrigerant flow path on the periphery of the drying channel, which can use water and other easily accessible refrigerants. The peripheral refrigerant heat exchange flow path and the distributed heat pump unit adopt indirect connection by heat exchange, which is convenient for maintenance and management in practical applications. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a schematic diagram of the container drying heat and humidity management system of the heat pump distributed cluster in embodiment 1 of the application;

[0034] Figure 2 is a schematic diagram of the container drying heat and humidity management system of the heat pump distributed cluster in embodiment 2 of the application.

[0035] Figure: 1, container tunnel type drying channel; 2, drying channel entrance; 3, drying channel exit; 4, container; 10, peripheral coolant heat exchange loop; 11, refrigeration heat pump unit (including A refrigerant-air heat exchanger, B compressor, C refrigerant-coolant heat exchanger, D throttling element, E four-way reversing valve); 12, terminal heat exchange device (including A coolant loop, B fan, C coolant-coolant heat exchanger). DETAILED DESCRIPTION

[0036] The present application will be described in detail below with reference to the accompanying drawings and specific examples. In this technical solution, if the structure / module name, control mode, algorithm, etc. are not explicitly stated, they are considered to be common technical features disclosed in the prior art.

[0037] Example 1

[0038] In this embodiment, the structure of the container drying and humidification management system of the heat pump distributed cluster refers to Figure 1 , which includes a tunnel type container drying channel 1, a peripheral coolant heat exchange loop 10, and a plurality of refrigeration heat pump units 11.

[0039] In this embodiment, the container tunnel type drying channel 1 includes an entrance 2 and an exit 3, and the entrance and exit are provided with electric roller shutters. The roller shutters are opened when the container 4 passes through and closed when there is no container 4 passing through. When operating stably, there are several containers 4 running at a constant speed in the drying channel 1, and the surface of the containers 4 is coated with paint to be dried.

[0040] In this embodiment, the peripheral coolant heat exchange loop 10 wraps around the outermost part of the drying channel 1, and adopts a closed loop. The inside is a circulating coolant, and in actual application, the coolant is preferably water.

[0041] In this embodiment, the peripheral coolant heat exchange loop 10 and the distributed refrigeration heat pump unit 11 are connected by the refrigerant-coolant heat exchanger 11-C. In this embodiment, the refrigeration heat pump unit 11 is connected to the inside of the drying channel 1 by the refrigerant-air heat exchanger 11-A.

[0042] In this embodiment, the refrigeration heat pump unit 11 can adopt different unit forms to adapt to the actual situation of the corresponding position. In practice, a unified configuration is preferred. The refrigeration heat pump unit 11 includes a refrigerant-air heat exchanger 11-A, a compressor 11-B, a refrigerant-coolant heat exchanger 11-C, a throttling element 11-D, and a four-way reversing valve 11-E. The components are connected in sequence. The four interfaces of the four-way reversing valve 11-E are respectively connected to the refrigerant-air heat exchanger 11-A, the suction port of the compressor 11-B, the refrigerant-coolant heat exchanger 11-C, and the exhaust port of the compressor 11-B.

[0043] The refrigeration heat pump unit 11 in this embodiment is in the form of a distributed cluster, arranged as needed along both sides of the drying channel 1. A simple implementation is uniform arrangement. The refrigeration heat pump unit 11 in this embodiment is a dual-purpose cold and heat type, having both heating and heat and humidity recovery modes. When it operates in the heating mode, the unit 11 takes heat from the peripheral carrier refrigerant heat exchange loop 10 and releases heat to the air inside the drying channel 1. When it operates in the heat and humidity recovery mode, the unit 11 cools and dehumidifies the air inside the drying channel 1, achieving heat and humidity recovery of the sensible heat and latent heat of the air, and releases heat to the peripheral carrier refrigerant heat exchange loop 10. The switching of the two modes of the unit 11 can be achieved by switching the internal four-way reversing valve 11-E, reversing the refrigerant flow path, and thus changing the heat exchange direction (heat absorption or heat release) in the refrigerant-air heat exchanger 11-A.

[0044] The operation process of the heat and humidity management system in this embodiment is as follows: ①The container 4 enters from one end 2 of the drying channel, and after rapid temperature rise preheating in the front section of the drying channel 1, the moisture on its surface is heated and evaporated into the drying channel, and after drying, it exits from the outlet 3 to enter the next process; ②The distributed heat pump unit cluster on both sides of the drying channel adjusts as needed. When it operates in the heating mode, it transfers the heat inside the peripheral carrier refrigerant heat exchange loop 10 to the inside of the drying channel 1, achieving heat supplement to the inside of the drying channel 1. When it operates in the heat and humidity recovery mode, it recovers the sensible heat of the air inside the drying channel 1 and the vaporization latent heat released by the dehumidification of the air, and then transfers it to the peripheral carrier refrigerant heat exchange loop 10. ③Through the different division of labor of the distributed cluster heat pump unit 11, multi-point heat supplement and heat extraction of the peripheral carrier refrigerant heat exchange loop 10 are achieved, and heat balance is maintained for stable operation; similarly, multi-point heat supplement and heat extraction of the drying channel 1 are achieved, heat balance in the drying channel is achieved, and humidity balance with the evaporated moisture of the container is achieved along with the dehumidification process of heat extraction in the drying channel 1.

[0045] The control method of the container drying heat and humidity management system of the heat pump distributed cluster in this embodiment is as follows: ①The cluster controller collects the weather data of the day and obtains the return air state data of the corresponding place collected by the unit from the distributed heat pump 11; ②Based on these input data, the iteration update of the drying channel simulation model inside the cluster controller is completed; ③Using the drying channel model updated with the data of the last moment, the load demand of each point is calculated and sent to the sub-controller of the distributed heat pump 11 at the point; ④The sub-controllers of the distributed heat pumps 11 determine the operating state according to the load demand, specifically, when the humidity load in the drying channel exceeds the set threshold, it operates in the heat and humidity recovery mode; when the heat load in the drying channel exceeds the set threshold, it operates in the heating mode.

[0046] Embodiment 2

[0047] The structure of the container drying heat and humidity management system of the heat pump distributed cluster in this embodiment is shown in Figure 2 .

[0048] The scheme in embodiment 1 has high flexibility and high energy saving. The heat pump unit 11 of the distributed cluster matches the optimal heat and humidity distribution in the drying channel by running in different modes of heating mode or heat and humidity recovery mode, so that maximum energy saving can be achieved. In addition, the integration of the control algorithm of this embodiment is higher. If a black box model such as machine learning / deep learning is used, the designer's professional experience of the heat and humidity distribution in the drying channel can not be relied on too much, and adaptive control logic adjustment can be realized. On the other hand, the intelligent level of the algorithm and the robustness of the anti-interference are also higher, and the implementation difficulty is increased.

[0049] In comparison, the overall principle of the system of embodiment 2 is similar to that of embodiment 1, but based on the prior knowledge of the designer, the scheme is simplified to a certain extent without departing from the spirit of the application, which loses part of the energy saving, but also greatly reduces the control difficulty.

[0050] Specifically, the heat pump unit 11 of this embodiment adopts a single mode, and according to the characteristics that the front section of the container tunnel type drying channel 1 needs to be preheated and rapidly heated, and the rear section needs to be fully dehumidified, the heat pump unit in heating mode is more arranged near the front half of the entrance of the drying channel 1, and the heat pump unit in heat and humidity recovery mode is more arranged in the rear half of the drying channel 1. In addition, in order to achieve the heat balance in the rear section of the drying channel, this embodiment also indirectly arranges a plurality of terminal heat exchange devices 12, which include a refrigerant loop 12-A inside the drying channel and a circulating fan 12-B, and are connected to the peripheral refrigerant heat exchange loop 10 through a refrigerant-refrigerant heat exchanger 12-C.

[0051] The operation process of this embodiment is as follows: ①The heat pump unit in the front section of the drying channel 1 is in heating mode, and the heat in the peripheral refrigerant heat exchange loop 10 is transferred to the inside of the drying channel 1, realizing rapid heating of the front section of the drying channel 1, and preheating the container 4 entering from one end 2 of the drying channel; ②The heat pump unit in the rear section of the drying channel 1 is in heat and humidity recovery mode, and the sensible heat of the air in the drying channel 1 and the latent heat released by the dehumidification of the air are recovered and transferred to the peripheral refrigerant heat exchange loop 10; ③The indirectly distributed terminal heat exchange device 12 takes heat from the peripheral refrigerant heat exchange loop 10 and supplements into the inside of the drying channel 1, especially maintains the internal air temperature of the rear section of the drying channel, and ensures the rapid precipitation of water in the surface paint of the container.

[0052] The control method of the embodiment is: ① the cluster controller collects the weather data of the day, and obtains the return air state data of the corresponding place from each sub-controller of the distributed heat pump 11 and the terminal heat exchange device 12; ② based on these input data, the iteration update of the internal drying channel simulation model of the cluster controller is completed; ③ using the drying channel model updated by the data of the last moment, the load rate of each distributed heat pump unit 11 and terminal heat exchange device 12 is obtained, and the output degree is determined, and when the value is negative, the unit is closed; otherwise, adjust the compressor speed and / or fan speed of each unit according to the load rate.

[0053] The controller in the technical solution is one of a single-chip microcomputer or an x86 architecture, an ARM architecture, and a RISC-V architecture processor.

[0054] The above description of the embodiments is for the convenience of the ordinary skilled person in the art to understand and use the invention. Those skilled in the art can easily make various modifications to these embodiments, and apply the general principles described herein to other embodiments without creative labor. Therefore, the present application is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art without departing from the scope of the present application should be within the scope of protection of the present application.

Claims

1. A heat pump based distributed cluster based container drying system, characterized in that, The application relates to a tunnel type container drying tunnel (1), a peripheral carrier refrigerant heat exchange loop (10) arranged around the tunnel type container drying tunnel (1), a plurality of refrigeration heat pump units (11) arranged along the tunnel type container drying tunnel (1), and a single mode heat pump unit. The refrigeration heat pump unit (11) is arranged in a single mode heat pump unit, wherein 90-100% of the heat pump units in a heating mode are arranged in the front half of the entrance of the drying tunnel, and 90-100% of the heat pump units in a heat and humidity recovery mode are arranged in the rear half of the drying tunnel. The heat pump distributed cluster container drying system further comprises a terminal heat exchange device, the terminal heat exchange device comprises a carrier refrigerant loop inside the drying tunnel and a circulating fan, and the carrier refrigerant loop is in heat exchange connection with the peripheral carrier refrigerant loop through a carrier refrigerant-carrier refrigerant heat exchanger. The refrigeration heat pump unit (11) in the front section transfers heat in the peripheral carrier refrigerant heat exchange loop to the inside of the drying tunnel, realizes rapid heating of the front section of the drying tunnel, and is used for preheating containers entering from one end of the drying tunnel. The refrigeration heat pump unit (11) in the rear section recovers and transfers the sensible heat of air in the drying tunnel and the latent heat of vaporization released by dehumidification of the air to the peripheral carrier refrigerant heat exchange loop. The indirectly distributed terminal heat exchange device takes heat from the peripheral carrier refrigerant heat exchange loop and supplements the inside of the drying tunnel, so as to promote rapid precipitation of water in the paint on the surface of the container. The refrigeration heat pump units (11) are uniformly arranged along the tunnel type container drying tunnel (1). The peripheral carrier refrigerant heat exchange loop (10) is wrapped on the outermost periphery of the drying tunnel to form a closed loop, and the peripheral carrier refrigerant heat exchange loop (10) is internally filled with circulating carrier refrigerant. The application further relates to a method for controlling the heat pump distributed cluster container drying system.

2. The container drying system based on heat pump distributed cluster according to claim 1, characterized in that, The application further relates to a method for controlling the heat pump distributed cluster container drying system.

3. The container drying system based on heat pump distributed cluster according to claim 1, characterized in that, The application further relates to a method for controlling the heat pump distributed cluster container drying system.

4. A control method of a container drying system based on a heat pump distributed cluster according to any one of claims 1 to 3, characterized in that, The application further relates to a method for controlling the heat pump distributed cluster container drying system. ​ ​ ​

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