A high-efficiency multi-stage drying system

Abstract

The embodiment of the present invention provides an efficient multi-stage drying system, which relates to the field of heat pump drying. The efficient multi-stage drying system includes a first drying area, a second drying area, a first air duct, a second air duct, a compressor, a throttling device, a first heat exchanger, a second heat exchanger, a first heat exchange component, a first fan and a second fan. A first gas flows in the first air duct, and the first fan is used to make the first gas start from the first drying area, flow along the first air duct, sequentially through the first heat exchange surface of the first heat exchange component, the first heat exchanger, and then flow into the first drying area; a second gas flows in the second air duct, and the second fan is used to make the second gas start from the second drying area, flow along the second air duct, sequentially through the second heat exchanger, the second heat exchange surface of the first heat exchange component, and then flow into the second drying area. The embodiment of the present invention can improve the energy efficiency of heat pump drying.

Description

Technical Field

[0001] The invention relates to the field of heat pump drying, and in particular to a high-efficiency multi-stage drying system. Background Art

[0002] In order to continuously improve the energy efficiency of heat pump drying, conventional technology often optimizes and improves a single heat pump drying unit by adjusting system design, heat exchanger design, control, air duct design, etc.; however, the improvement of the energy efficiency of heat pump drying by this technology is limited. Summary of the invention

[0003] The object of the present invention is to provide a high-efficiency multi-stage drying system, which can improve the energy efficiency of heat pump drying.

[0004] The embodiment of the present invention provides a high-efficiency multi-stage drying system, comprising a first drying area, a second drying area, a first air duct, a second air duct, a compressor, a throttling device, a first heat exchanger, a second heat exchanger, a first heat exchanging assembly, a first fan and a second fan; the exhaust port of the compressor is connected to the inlet of the first heat exchanger, the outlet of the first heat exchanger is connected to the inlet of the throttling device, the outlet of the throttling device is connected to the inlet of the second heat exchanger, the outlet of the second heat exchanger is connected to the air intake port of the compressor, the compressor, the first heat exchanger, the second heat exchanger and the throttling device are used for circulating refrigerant; the first drying area and the second drying area are both used for drying the objects to be dried, and the temperature of the first drying area is greater than the temperature of the second drying area; the first heat exchanging assembly has a first heat exchanging surface and a second heat exchanging surface, the first heat exchanging surface and the The second heat exchange surfaces can exchange heat with the gases flowing through each other, and the gas flowing through the first heat exchange surface does not contact the gas flowing through the second heat exchange surface; the inlet and outlet ends of the first air duct are respectively connected to the first drying area, and the first gas flows in the first air duct. The first fan is used to make the first gas start from the first drying area, flow along the first air duct, sequentially pass through the first heat exchange surface of the first heat exchange component and the first heat exchanger, and then flow into the first drying area, and circulate in this way; the inlet and outlet ends of the second air duct are respectively connected to the second drying area, and the second gas flows in the second air duct. The second fan is used to make the second gas start from the second drying area, flow along the second air duct, sequentially pass through the second heat exchanger and the second heat exchange surface of the first heat exchange component, and then flow into the second drying area, and circulate in this way.

[0005] In an optional embodiment, the high-efficiency multi-stage drying system also includes a first water receiving pan and a first water pipe, the first water receiving pan is arranged below the second heat exchanger, and the first water pipe is connected to the first water receiving pan for draining water in the first water receiving pan to the first drying area, the second drying area, the first air duct, and an area outside the second air duct.

[0006] In an optional embodiment, the high-efficiency multi-stage drying system also includes a second water pipe, which is used to drain the condensed water generated by the first heat exchange component to the first drying area, the second drying area, the first air duct and the area outside the second air duct.

[0007] In an optional embodiment, the first air duct is provided with a first bypass air duct, which connects the upstream and downstream of the first heat exchange surface of the first heat exchange component; and / or, the second air duct is provided with a second bypass air duct, which connects the upstream and downstream of the second heat exchanger.

[0008] In an optional embodiment, the high-efficiency multi-stage drying system also includes a third heat exchanger, which is located upstream of the second heat exchanger in the second air duct, and the second fan is used to make the second gas flow out from the second drying area along the second air duct, and flow into the second drying area along the third heat exchanger, the second heat exchanger, and the second heat exchange surface of the first heat exchange component in sequence.

[0009] In an optional embodiment, the high-efficiency multi-stage drying system also includes a first water receiving tray and a first water pipe, the first water receiving tray is arranged below the second heat exchanger, one end of the first water pipe is connected to the first water receiving tray, and the other end is connected to the inlet of the third heat exchanger, for draining the water in the first water receiving tray to the third heat exchanger.

[0010] In an optional embodiment, the high-efficiency multi-stage drying system also includes a fourth heat exchanger, which is located upstream of the first heat exchange surface of the first heat exchange component in the first air duct, and the first fan is used to make the first gas flow out from the first drying area along the first air duct, and flow through the fourth heat exchanger, the first heat exchange surface of the first heat exchange component, the first heat exchanger in sequence, and then flow into the first drying area, and thus circulate.

[0011] In an optional embodiment, the high-efficiency multi-stage drying system also includes a second water pipe, which is used to divert condensed water generated by the first heat exchange surface of the first heat exchange component to the fourth heat exchanger, and the outlet of the fourth heat exchanger is connected to the drying area and the area outside the air duct.

[0012] In an optional embodiment, the high-efficiency multi-stage drying system also includes a first water receiving pan and a first water pipe, wherein the first water receiving pan is arranged below the second heat exchanger, one end of the first water pipe is connected to the first water receiving pan, and the other end is connected to the inlet of the fourth heat exchanger, for draining the water in the first water receiving pan to the fourth heat exchanger, and the outlet of the fourth heat exchanger is connected to all drying areas and areas outside the air duct.

[0013] In an optional embodiment, the high-efficiency multi-stage drying system also includes a second heat exchange component, the second heat exchange component has a third heat exchange surface and a fourth heat exchange surface, the third heat exchange surface and the fourth heat exchange surface can exchange heat with the gas flowing through each other, and the gas flowing through the third heat exchange surface does not contact the gas flowing through the fourth heat exchange surface; the third heat exchange surface of the second heat exchange component is located downstream of the first heat exchange surface of the first heat exchange component in the first air duct, and the first fan is used to make the first gas start from the first drying area, along the first air duct, pass through the first heat exchange surface of the first heat exchange component, the third heat exchange surface of the second heat exchange component, the first heat exchanger in sequence, and return to the first drying area; the fourth heat exchange surface of the second heat exchange component is located upstream of the second heat exchanger in the second air duct, and the second fan is used to make the second gas start from the second drying area, flow through the fourth heat exchange surface of the second heat exchange component, the second heat exchanger, the second heat exchange surface of the first heat exchange component in sequence, and return to the second drying area.

[0014] In an optional embodiment, the first heat exchange component includes a first channel and a second channel that are not connected, a heat-conducting medium is arranged between the first channel and the second channel, the first channel forms the first heat exchange surface, and the second channel forms the second heat exchange surface; or, the first heat exchange component includes a first sub-heat exchanger and a second sub-heat exchanger, the second sub-heat exchanger is located higher than the first sub-heat exchanger, the first sub-heat exchanger and the second sub-heat exchanger are connected to form a closed cavity, the cavity is used to accommodate refrigerant, the outer surface of the first sub-heat exchanger is the first heat exchange surface, and the outer surface of the second sub-heat exchanger is the second heat exchange surface; or, the first heat exchange component includes a first sub-heat exchanger, a second sub-heat exchanger and a water pump, the first sub-heat exchanger and the second sub-heat exchanger are connected by a pipeline to form a closed circulation system, a medium flows in the closed circulation system, the water pump is arranged in the closed circulation system, and is used to circulate the medium in the system, the surface of the first sub-heat exchanger is the first heat exchange surface, and the outer surface of the second sub-heat exchanger is the second heat exchange surface.

[0015] An embodiment of the present invention provides a high-efficiency multi-stage drying system, comprising a first drying area, a second drying area, a first air duct, a second air duct, a compressor, a first heat exchange component, a throttling device, a first heat exchanger, a second heat exchanger, a first fan, a second fan, 1 to N intermediate air ducts, 1 to N intermediate drying areas, 1 to N intermediate heat exchange components, and 1 to N intermediate fans, wherein N is a positive integer greater than or equal to 1; the exhaust port of the compressor is connected to the inlet of the first heat exchanger, the outlet of the first heat exchanger is connected to the inlet of the throttling device, the outlet of the throttling device is connected to the inlet of the second heat exchanger, the outlet of the second heat exchanger is connected to the air intake port of the compressor, and the The compressor, the first heat exchanger, the second heat exchanger and the throttling device are used for circulating the refrigerant; the first drying area, the second drying area and the 1st to N intermediate drying areas are all used for drying the objects to be dried, the temperature of the first drying area is greater than that of the second drying area, and the temperature of the 1st to N intermediate drying areas is less than that of the first drying area and greater than that of the second drying area, and when N≥2, the temperature of the kth intermediate drying area is less than that of the k-1th intermediate drying area, wherein k is a positive integer and the value of k ranges from 2 to N; the first heat exchange component has a first heat exchange surface and a second heat exchange surface, and the first heat exchange surface and the The two heat exchange surfaces can exchange heat with the gases flowing through each other, and the gas flowing through the first heat exchange surface does not contact the gas flowing through the second heat exchange surface; the 1st to N intermediate heat exchange components each have a first intermediate heat exchange surface and a second intermediate heat exchange surface, the first intermediate heat exchange surface and the second intermediate heat exchange surface can exchange heat with the gases flowing through each other, and the gas flowing through the first intermediate heat exchange surface does not contact the gas flowing through the second intermediate heat exchange surface; when N=1: the 1st to N intermediate drying areas are the first intermediate drying areas, the 1st to N intermediate heat exchange components are the first intermediate heat exchange components, the 1st to N intermediate air ducts are the first intermediate air ducts, the 1st to N intermediate The fan is a first intermediate fan; the two ends of the first air duct are respectively connected to the first drying area, and the first fan causes the gas in the first drying area to start from the first drying area, flow along the first air duct, sequentially pass through the first intermediate heat exchange surface of the first intermediate heat exchange component and the first heat exchanger, and then flow into the first drying area, and circulate in this way; the two ends of the second air duct are respectively connected to the second drying area, and the second fan causes the gas in the second drying area to start from the second drying area, flow along the second air duct, sequentially pass through the second heat exchanger and the second heat exchange surface of the first heat exchange component, and then flow into the second drying area, and circulate in this way;The two ends of the first intermediate air duct are respectively connected to the first intermediate drying area, and the first intermediate fan is used to make the gas in the first intermediate drying area flow along the first intermediate air duct, sequentially through the first heat exchange surface of the first heat exchange component, the second intermediate heat exchange surface of the first intermediate heat exchange component, and then flow into the first intermediate drying area, and circulate in this way; when N≥2: the 1st to N intermediate drying areas include the i-th intermediate drying area, the 1st to N intermediate heat exchange components include the i-th intermediate heat exchange component, the 1st to N intermediate air ducts include the i-th intermediate air duct, and the 1st to N intermediate fans include the i-th intermediate fan, wherein 1≤i≤N-1; the two ends of the first air duct are respectively connected to the first drying area, and the first fan is used to make the first gas start from the first drying area, flow along the first air duct, sequentially through the first intermediate heat exchange surface of the first intermediate heat exchange component, the first heat exchanger, and then flow into the first drying area, and circulate in this way; the two ends of the second air duct The two ends of the i-th intermediate air duct are respectively connected to the second drying area, and the second fan is used to make the second gas start from the second drying area, flow through the second heat exchanger and the second heat exchange surface of the first heat exchange component in sequence along the second air duct, and then flow into the second drying area, and circulate in this way; the two ends of the i-th intermediate air duct are respectively connected to the i-th intermediate drying area, and the i-th intermediate fan is used to make the gas in the i-th intermediate drying area flow through the first intermediate heat exchange surface of the i+1th intermediate heat exchange component and the second intermediate heat exchange surface of the i-th intermediate heat exchange component in sequence along the i-th intermediate air duct, and then flow into the i-th intermediate drying area, and circulate in this way; the two ends of the N-th intermediate air duct are respectively connected to the N-th intermediate drying area, and the N-th intermediate fan is used to make the gas in the N-th intermediate drying area flow through the first heat exchange surface of the first heat exchange component and the second intermediate heat exchange surface of the N-th intermediate heat exchange component in sequence along the N-th intermediate air duct, and then flow into the first intermediate drying area, and circulate in this way. ;

[0016] In an optional embodiment, the high-efficiency multi-stage drying system also includes at least one pre-cooling heat exchanger, the inlet of the pre-cooling heat exchanger is used for the inflow of cooling medium, and the outlet is used to guide the cooling medium to the drying area and outside the air duct, and the cooling medium is used to exchange heat with the gas; the pre-cooling heat exchanger is located upstream of the first intermediate heat exchange surface of the first intermediate heat exchange component in the first air duct; and / or, the pre-cooling heat exchanger is located upstream of the second heat exchanger in the second air duct; and / or, the pre-cooling heat exchanger is located in at least one of the 1st to N-1 intermediate air ducts and upstream of the first intermediate heat exchange surface of the corresponding 2nd to N intermediate heat exchange components; and / or, the pre-cooling heat exchanger is located upstream of the first intermediate heat exchange surface of the first intermediate heat exchange component in the Nth intermediate air duct.

[0017] In an optional embodiment, the high-efficiency multi-stage drying system also includes at least one drain pipe; the at least one precooling heat exchanger includes an mth intermediate precooling heat exchanger, and when m=1, the mth intermediate precooling heat exchanger is the first intermediate precooling heat exchanger, and the first intermediate precooling heat exchanger is located upstream of the first intermediate heat exchange surface of the first intermediate heat exchange component in the first air duct; when m≥2, the mth intermediate precooling heat exchanger is located upstream of the first intermediate heat exchange surface of the mth intermediate heat exchange component in the m-1th intermediate air duct; the at least one drain pipe includes a jth intermediate drain pipe, the jth intermediate drain pipe is connected to the first intermediate heat exchange surface of the jth intermediate heat exchange component by water, and the jth intermediate drain pipe is connected to the inlet of the mth intermediate precooling heat exchanger, and is used to drain condensed water to the mth intermediate precooling heat exchanger , wherein m and j are positive integers, and 1≤m≤j≤N; and / or, the high-efficiency multi-stage drying system further comprises a water receiving pan, the water receiving pan is arranged below the second heat exchanger, the at least one drain pipe comprises a first drain pipe, the first drain pipe is respectively connected to the water receiving pan and the inlet of the precooling heat exchanger, and is used to drain the condensed water generated by the second heat exchanger to any one of the at least one precooling heat exchanger; and / or, the at least one drain pipe comprises a second drain pipe, the second drain pipe is connected to the water path of the first heat exchange component, and is connected to the inlet of the precooling heat exchanger corresponding to the first heat exchange component and located in the Nth intermediate air duct or the mth intermediate precooling heat exchanger, and is used to drain the condensed water generated by the first heat exchange component to the precooling heat exchanger corresponding to the first heat exchange component.

[0018] The beneficial effects of the embodiments of the present invention are as follows: Under normal circumstances, the heat pump drying unit provides a cooling capacity Q and consumes a power of P. The corresponding cooling capacity Q can be the condensation of moisture in the gas in the dried area, so that the total energy efficiency can be roughly evaluated and calculated using Q / P, or water output / power consumption. In this solution, the cooling capacity Q is provided in the corresponding refrigeration cycle, that is, the cooling capacity for the second gas treatment is Q. Through the heat exchange between the first gas and the second gas, the cooling capacity Q can be provided to the first gas. The increase in the power consumption of the fan caused by the heat exchange between the first gas and the second gas in this solution is calculated as P1. Then, the energy efficiency of this solution is 2Q / (P+P1), and in general, P is greater than P1, and in actual reference, P can be greater than 3 times P1, or even greater than 10 times P1. Then the energy efficiency of this solution is greater than 1.5Q / P, which is more than 50% higher than the energy efficiency of the conventional solution. In another form of the present invention, that is, a solution including an intermediate drying area and its intermediate fan, intermediate heat exchange assembly and intermediate air duct, the overall drying energy efficiency is further improved due to the use of more intermediate drying areas. The embodiment of the present invention provides a more efficient and energy-saving heat pump drying system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 A schematic diagram of the structure of a high-efficiency multi-stage drying system provided by an embodiment of the present invention;

[0021] Figure 2 for Figure 1 A schematic diagram of a structure in which the high-efficiency multi-stage drying system includes a first bypass air duct and a second bypass air duct;

[0022] Figure 3 for Figure 1 A schematic diagram of the structure of the high-efficiency multi-stage drying system including a third heat exchanger;

[0023] Figure 4 for Figure 1 A schematic diagram of the structure of the high-efficiency multi-stage drying system including a fourth heat exchanger;

[0024] Figure 5 for Figure 1 A schematic diagram of a structure in which the high-efficiency multi-stage drying system includes a third heat exchanger and a fourth heat exchanger;

[0025] Figure 6 for Figure 1 A schematic diagram of the structure of the high-efficiency multi-stage drying system including a second heat exchange component;

[0026] Figure 7 for Figure 1 A schematic diagram of a first possible structural form of the first heat exchange component in;

[0027] Figure 8 for Figure 1 A schematic diagram of a second possible structural form of the first heat exchange component;

[0028] Fig. 9 for Figure 1 A schematic diagram of a third possible structural form of the first heat exchange component;

[0029] Fig.10 The high-efficiency multi-stage drying system provided by the embodiment of the present invention includes a structural schematic diagram of a first intermediate drying area;

[0030] Fig.11A high-efficiency multi-stage drying system provided by an embodiment of the present invention includes a schematic structural diagram of two intermediate drying areas;

[0031] Fig.12 for Fig.10 The schematic diagram of the structure of the intermediate precooling heat exchanger is included;

[0032] Fig.13 for Fig.12 Another structural schematic diagram including an intermediate precooling heat exchanger;

[0033] Fig.14 for Fig.10 The schematic diagram of the structure of the precooling heat exchanger is included.

[0034] Icons: 100-high-efficiency multi-stage drying system; 101-first drying area; 102-second drying area; 103-first air duct; 104-second air duct; 105-compressor; 106-throttling device; 107-first heat exchanger; 108-second heat exchanger; 109-first heat exchange component; 1091-first sub-heat exchanger; 1092-second sub-heat exchanger; 1093-water pump; 110-first fan; 111-second fan; 112-first water tray; 113-first water pipe; 114-second water pipe; 115-first bypass air duct; 116-second bypass air duct; 1 17-third heat exchanger; 118-fourth heat exchanger; 119-second heat exchange assembly; 120-first intermediate drying area; 121-first intermediate heat exchange assembly; 122-first intermediate air duct; 123-first intermediate fan; 124-second intermediate drying area; 125-second intermediate heat exchange assembly; 126-second intermediate air duct; 127-second intermediate fan; 128-first intermediate precooling heat exchanger; 129-first intermediate drain pipe; 130-second intermediate precooling heat exchanger; 131-second intermediate drain pipe; 132-first drain pipe; 133-water tray; 134-second drain pipe. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0038] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0039] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0040] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] See also Figure 1 The embodiment of the present invention provides a high-efficiency multi-stage drying system 100. The high-efficiency multi-stage drying system 100 has a higher efficiency and energy-saving effect than the conventional solution. The high-efficiency multi-stage drying system 100 provided by the embodiment of the present invention makes full use of multi-stage heat exchange, can use fewer refrigeration compressors 105 cycles, achieve more overall cooling capacity and heating capacity, achieve the purpose of consuming less power, generating more cooling capacity, and discharging more moisture, and achieve higher energy efficiency of the overall drying system.

[0042] In an embodiment of the present invention, the high-efficiency multi-stage drying system 100 includes a first drying area 101, a second drying area 102, a first air duct 103, a second air duct 104, a compressor 105, a throttling device 106, a first heat exchanger 107, a second heat exchanger 108, a first heat exchange component 109, a first fan 110 and a second fan 111.

[0043] Among them, the exhaust port of the compressor 105 is connected to the inlet of the first heat exchanger 107, the outlet of the first heat exchanger 107 is connected to the inlet of the throttling device 106, the outlet of the throttling device 106 is connected to the inlet of the second heat exchanger 108, the outlet of the second heat exchanger 108 is connected to the suction port of the compressor 105, the compressor 105, the first heat exchanger 107, the second heat exchanger 108, and the throttling device 106 are used to supply the circulation of refrigerant; the first drying area 101 and the second drying area 102 are both used to dry the objects to be dried, and the temperature of the first drying area 101 is greater than the temperature of the second drying area 102.

[0044] In the embodiment of the present invention, the first heat exchange component 109 has a first heat exchange surface and a second heat exchange surface, and the first heat exchange surface and the second heat exchange surface can exchange heat with the gas flowing through each other, and the gas flowing through the first heat exchange surface does not contact the gas flowing through the second heat exchange surface;

[0045] In an embodiment of the present invention, both ends of the inlet and outlet of the first air duct 103 are respectively connected to the first drying area 101, a first gas circulates in the first air duct 103, and the first fan 110 is used to allow the first gas to start from the first drying area 101, flow along the first air duct 103, sequentially pass through the first heat exchange surface of the first heat exchange component 109, the first heat exchanger 107, and then flow into the first drying area 101; both ends of the inlet and outlet of the second air duct 104 are respectively connected to the second drying area 102, a second gas circulates in the second air duct 104, and the second fan 111 is used to allow the second gas to start from the second drying area 102, flow along the second air duct 104, sequentially pass through the second heat exchanger 108 and the second heat exchange surface of the first heat exchange component 109, and then flow into the second drying area 102.

[0046] Optionally, the first heat exchange surface of the first heat exchange assembly 109 and the first heat exchanger 107 are both disposed in the first air duct 103, or are used to form the first air duct 103; similarly, the second heat exchanger 108 and the second heat exchange surface of the first heat exchange assembly 109 are both disposed in the second air duct 104, or are used to form the second air duct 104. The first fan 110 may be located in the first air duct 103, and the second fan 111 may be located in the second air duct 104.

[0047] It should be noted that the working principle of the embodiment of the present invention is: compression refrigeration cycle, providing cold capacity Q through the second heat exchanger 108, overall power consumption P, the second gas is cooled after passing through the second heat exchanger 108, releasing heat energy Q, and a part of the water is condensed and discharged, the second gas is heated after passing through the first heat exchange component 109 and exchanging heat with the first gas, absorbing heat Q, the first gas is cooled after the heat exchange process, releasing heat energy Q, and a part of the water is condensed, the second gas continues to flow along the second air duct 104 into the second drying area 102, the first gas continues to flow along the first air duct 103 through the first heat exchanger 107 and is heated, and then flows into the first drying area 101, forming a cycle. During the treatment process, the first gas and the second gas are generally cooled, releasing 2Q of heat energy, which is twice the cold capacity Q provided by the conventional compression refrigeration cycle, and the power consumption increased by the process is very limited, only the power consumption of the heat exchange between the first gas and the second gas is increased, and the power consumption is much less than the above-mentioned overall power consumption P. The embodiment of the present invention forms a more efficient and energy-saving heat pump drying system.

[0048] According to calculations, the high-efficiency multi-stage drying system 100 improves energy efficiency by more than 50% compared to conventional solutions. Calculation process:

[0049] Under normal circumstances, the heat pump drying unit provides cooling capacity Q and consumes power P. The corresponding cooling capacity Q can be the condensation of moisture in the gas in the dried area. In this way, the total energy efficiency can be roughly evaluated and calculated using Q / P, or water output / power consumption.

[0050] In this scheme, the cooling capacity Q is provided in the corresponding refrigeration cycle, that is, the cooling capacity processed for the second gas is Q. The cooling capacity Q can be provided to the first gas through the heat exchange between the first gas and the second gas. The increase in the fan power consumption caused by the heat exchange between the first gas and the second gas in this scheme is calculated as P1. Then, the energy efficiency of this scheme is 2Q / (P+P1). In general, P is greater than P1, and in actual reference, P can be greater than 3 times P1, or even greater than 10 times P1. Then, the energy efficiency of this scheme is greater than 1.5Q / P, which is more than 50% higher than the energy efficiency of the conventional scheme.

[0051] In an optional embodiment, the high-efficiency multi-stage drying system 100 may also include a first water receiving tray 112 and a first water pipe 113. The first water receiving tray 112 is arranged below the second heat exchanger 108. The first water pipe 113 is connected to the first water receiving tray 112 and is used to drain the water in the first water receiving tray 112 to the first drying area 101, the second drying area 102, the first air duct 103 and the second air duct 104. Area outside.

[0052] In an optional embodiment, the high-efficiency multi-stage drying system 100 may also include a second water pipe 114, which is used to drain the condensed water generated by the first heat exchange component 109 to areas outside the first drying area 101, the second drying area 102, the first air duct 103 and the second air duct 104.

[0053] It should be understood that the first heat exchange surface of the first heat exchange component 109 will produce condensed water during the heat exchange process, and the second water pipe 114 can drain the condensed water to an area outside the air duct and the drying area. Optionally, the second water pipe 114 can be connected to the first heat exchange surface of the first heat exchange component 109 to directly drain the condensed water; or, the second water pipe 114 is connected to the air duct near the first heat exchange component 109, and the condensed water flows from the first heat exchange surface along the air duct to the second water pipe 114.

[0054] See also Figure 2 In an optional embodiment, the first air duct 103 is provided with a first bypass air duct 115, which connects the upstream and downstream of the first heat exchange surface; and / or the second air duct 104 is provided with a second bypass air duct 116, which connects the upstream and downstream of the second heat exchanger 108.

[0055] It should be noted that the function of the first bypass air duct 115 is to regulate the air volume flowing through the first heat exchanger 107, so as to improve the heat exchange efficiency of the first heat exchanger 107 and reduce the condensation temperature of the compression refrigeration cycle, thereby reducing power consumption and improving energy efficiency; the function of the second bypass air duct 116 is to regulate the air volume flowing through the second heat exchange surface of the first heat exchange component 109, so as to improve the heat exchange efficiency of the first heat exchange component 109, so that the heat exchange energy of the first gas and the second gas can reach the set heat exchange amount, and can also further control the temperature of the second gas after flowing through the second heat exchange surface of the first heat exchange component 109.

[0056] Optionally, air valves are provided in the first bypass air duct 115 and the second bypass air duct 116 to adjust the air volume of the first bypass air duct 115 and the second bypass air duct 116 .

[0057] See also Figure 3 In an optional embodiment, the high-efficiency multi-stage drying system 100 also includes a third heat exchanger 117, which is located upstream of the second heat exchanger 108 in the second air duct 104. The second fan 111 is used to make the second gas flow out of the second drying area 102 along the second air duct 104, and flow into the second drying area 102 along the third heat exchanger 117, the second heat exchanger 108, and the second heat exchange surface of the first heat exchange component 109 in sequence.

[0058] It should be understood that the third heat exchanger 117 can pre-cool the gas. After the second gas is pre-cooled by the third heat exchanger 117, the amount of the second gas cooled can be further increased to achieve more condensation and drainage of the second gas. For the entire system, in some operating conditions, since the heat of the refrigeration cycle is greater than the coldness, and there are differences in the state of the dried objects in the drying area, a certain amount of coldness is required to supplement the system to achieve balance. In this way, the required coldness is used as pre-cooling for the gas to achieve the purpose of condensing and discharging water when the coldness is maximized.

[0059] Furthermore, the high-efficiency multi-stage drying system 100 also includes a first water receiving tray 112 and a first water pipe 113. The first water receiving tray 112 is arranged below the second heat exchanger 108. One end of the first water pipe 113 is connected to the first water receiving tray 112, and the other end is connected to the inlet of the third heat exchanger 117, which is used to drain the water in the first water receiving tray 112 to the third heat exchanger 117.

[0060] Optionally, the condensed water in the first water receiving pan 112 can be pumped into the third heat exchanger 117 by the water pump 1093; or, the third heat exchanger 117 is arranged below the first water receiving pan 112, and the water is drained to the third heat exchanger 117 under the action of gravity. Of course, the cold source of the third heat exchanger 117 can also come from an external flowable medium, such as cooling water in a cooling tower.

[0061] See also Figure 4 In an optional embodiment, the high-efficiency multi-stage drying system 100 also includes a fourth heat exchanger 118, which is located upstream of the first heat exchange surface of the first heat exchange component 109 in the first air duct 103. The first fan 110 is used to make the first gas flow out of the first drying area 101 along the first air duct 103, and flow through the fourth heat exchanger 118, the first heat exchange surface of the first heat exchange component 109, and the first heat exchanger 107 in sequence, and then flow into the first drying area 101, and circulate in this way.

[0062] It should be understood that the fourth heat exchanger 118 can pre-cool the first gas. After the first gas is pre-cooled by the fourth heat exchanger 118, the amount of the first gas cooled can be further increased to achieve more condensation and drainage of the first gas. For the entire system, in some operating conditions, since the heat of the refrigeration cycle is greater than the coldness, and there are differences in the state of the dried objects in the drying area, a certain amount of coldness is required to supplement the system to achieve balance. In this way, the required coldness is used as pre-cooling for the gas to achieve the purpose of condensing and discharging water from the gas when the coldness is maximized.

[0063] Furthermore, the high-efficiency multi-stage drying system 100 may also include a second water pipe 114, one end of which is connected to the first heat exchange surface of the first heat exchange component 109 or to the air duct connected to the first heat exchange surface of the first heat exchange component 109, and the other end of the second water pipe 114 is connected to the inlet of the fourth heat exchanger 118, which is used to drain the condensed water generated by the first heat exchange component 109 to the fourth heat exchanger 118, and the outlet of the fourth heat exchanger 118 is connected to the area outside the drying area and the air duct. In other words, the second water pipe 114 is used to drain the condensed water generated by the first heat exchange component 109 to the fourth heat exchanger 118, which is used for the fourth heat exchanger 118 to heat the gas; and after the heat exchange, the condensed water is discharged to the outside of the air duct and the drying area. Of course, the cold source of the fourth heat exchanger 118 can also come from an external flowable medium, such as cooling water in a cooling tower.

[0064] In an optional embodiment, the high-efficiency multi-stage drying system 100 also includes a first water receiving tray 112 and a first water pipe 113. The first water receiving tray 112 is arranged below the second heat exchanger 108. One end of the first water pipe 113 is connected to the first water receiving tray 112, and the other end is connected to the inlet of the fourth heat exchanger 118, which is used to drain the water in the first water receiving tray 112 to the fourth heat exchanger 118. The outlet of the fourth heat exchanger 118 is connected to all drying areas and areas outside the air duct.

[0065] See also Figure 5 At the same time, it should be noted that in an embodiment of the present invention, the above-mentioned third heat exchanger 117 and fourth heat exchanger 118 can be set at the same time; at this time, the condensed water in the first water receiving tray 112 can be drained to the third heat exchanger 117 and the fourth heat exchanger 118 at the same time, and a valve can also be set to control the drainage of the condensed water to the third heat exchanger 117 or the fourth heat exchanger 118.

[0066] See also Figure 6In an optional embodiment, the high-efficiency multi-stage drying system 100 may further include a second heat exchange component 119, the second heat exchange component 119 having a third heat exchange surface and a fourth heat exchange surface, the third heat exchange surface and the fourth heat exchange surface are capable of exchanging heat with the gas flowing through each other, and the gas flowing through the third heat exchange surface does not contact the gas flowing through the fourth heat exchange surface. The third heat exchange surface of the second heat exchange component 119 is located downstream of the third heat exchanger 117 in the first air duct 103, and the first fan 110 is used to make the first gas start from the first drying area 101, along the first air duct 103, pass through the first heat exchange surface, the third heat exchange surface of the second heat exchange component 119, the first heat exchanger 107 in sequence, and return to the first drying area 101. The fourth heat exchange surface of the second heat exchange component 119 is located upstream of the second heat exchanger 108 in the second air duct 104, and the second fan 111 is used to make the second gas start from the second drying area 102, flow through the fourth heat exchange surface of the second heat exchange component 119, the second heat exchanger 108, the second heat exchange surface of the first heat exchange component 109 in sequence, and return to the second drying area 102.

[0067] It should be noted that the second heat exchange component 119 can further recover waste heat. The first gas is cooled after being cooled by the first heat exchange component 109. The temperature after cooling can be lower than the temperature of the second drying area 102 and the temperature of the second gas flowing out of the second area. After the first gas and the second gas exchange heat through the second heat exchange component 119, the first gas is heated and the second gas is cooled. The first gas is further heated by the first heat exchanger 107, and the second gas is further cooled by the second heat exchanger 108. The total amount of the second gas cooled will be greater than the cooling capacity of the refrigeration cycle, achieving higher cooling capacity operation, further driving the first gas to achieve greater cooling capacity through the first heat exchange component 109, thereby achieving higher energy efficiency and more energy-saving operation.

[0068] It should be understood that the first heat exchange assembly 109 and the second heat exchange assembly 119 can have a variety of structural forms. Figures 7 to 9 , several structural forms of the first heat exchange component 109 are briefly described below. Correspondingly, the structural form of the second heat exchange component 119 can refer to the first heat exchange component 109.

[0069] See also Figure 7 Optionally, the first heat exchange component 109 includes a first channel and a second channel that are not connected, a heat-conducting medium is arranged between the first channel and the second channel, the first channel forms a first heat exchange surface, and the second channel forms a second heat exchange surface; wherein the heat-conducting medium can be a metal with good thermal conductivity.

[0070] See also Figure 8Alternatively, the first heat exchange component 109 includes a first sub-heat exchanger 1091 and a second sub-heat exchanger 1092, the second sub-heat exchanger 1092 is located higher than the first sub-heat exchanger 1091, the first sub-heat exchanger 1091 and the second sub-heat exchanger 1092 are connected to form a closed cavity, the cavity is used to accommodate the refrigerant, the surface of the first sub-heat exchanger 1091 is the first heat exchange surface, and the outer surface of the second sub-heat exchanger 1092 is the second heat exchange surface;

[0071] See also Fig. 9 Alternatively, the first heat exchange component 109 includes a first sub-heat exchanger 1091, a second sub-heat exchanger 1092 and a water pump 1093. The first sub-heat exchanger 1091 and the second sub-heat exchanger 1092 are connected by a pipeline to form a closed circulation system. A medium flows in the closed circulation system. The water pump 1093 is arranged in the closed circulation system to circulate the medium in the system. The outer surface of the first sub-heat exchanger 1091 is a first heat exchange surface, and the outer surface of the second sub-heat exchanger 1092 is a second heat exchange surface.

[0072] It should be noted that the first heat exchange component 109 and the second heat exchange component 119 can adopt the same or similar structure. That is, the second heat exchange component 119 can also be the above three situations, and the first heat exchange component 109 and the second heat exchange component 119 can be different structures. That is, when the first heat exchange component 109 adopts the above first structure, the second heat exchange component 119 can adopt any one of the above three structures, for example, the second heat exchange component 119 adopts the above second structure.

[0073] See also Figures 10 to 14 An embodiment of the present invention provides a high-efficiency multi-stage drying system 100, which includes a first drying area 101, a second drying area 102, a first air duct 103, a second air duct 104, a compressor 105, a first heat exchange component 109, a throttling device 106, a first heat exchanger 107, a second heat exchanger 108, a first fan 110, a second fan 111, 1st to N intermediate air ducts, 1st to N intermediate drying areas, 1st to N intermediate heat exchange components, and 1st to N intermediate fans, wherein N is a positive integer greater than or equal to 1.

[0074] The exhaust port of the compressor 105 is connected to the inlet of the first heat exchanger 107, the outlet of the first heat exchanger 107 is connected to the inlet of the throttling device 106, the outlet of the throttling device 106 is connected to the inlet of the second heat exchanger 108, the outlet of the second heat exchanger 108 is connected to the air intake port of the compressor 105, and the compressor 105, the first heat exchanger 107, the second heat exchanger 108 and the throttling device 106 are used to circulate the refrigerant. The first drying area 101, the second drying area 102, and the 1st to Nth intermediate drying areas are all used to dry the objects to be dried. The temperature of the first drying area 101 is greater than that of the second drying area 102, and the temperature of the 1st to Nth intermediate drying areas is less than that of the first drying area 101 and greater than that of the second drying area 102; when N≥2, the temperature of the kth intermediate drying area is less than that of the k-1th intermediate drying area, wherein k is a positive integer, and k takes values ​​from 2 to N.

[0075] The first heat exchange component 109 has a first heat exchange surface and a second heat exchange surface. The first heat exchange surface and the second heat exchange surface can exchange heat with the gas flowing through each other, and the gas flowing through the first heat exchange surface does not contact the gas flowing through the second heat exchange surface.

[0076] The 1st to Nth intermediate heat exchange components all have a first intermediate heat exchange surface and a second intermediate heat exchange surface, which can exchange heat with the gases flowing through them respectively, and the gas flowing through the first intermediate heat exchange surface does not contact the gas flowing through the second intermediate heat exchange surface.

[0077] When N=1: the 1st to N intermediate drying areas are the first intermediate drying areas 120 , the 1st to N intermediate heat exchange components are the first intermediate heat exchange components 121 , the 1st to N intermediate air ducts are the first intermediate air ducts 122 , and the 1st to N intermediate fans are the first intermediate fans 123 .

[0078] Both ends of the first air duct 103 are connected to the first drying area 101 respectively. The first fan 110 allows the gas in the first drying area 101 to start from the first drying area 101, flow along the first air duct 103, successively pass through the first intermediate heat exchange surface of the first intermediate heat exchange component 121 and the first heat exchanger 107, and then flow into the first drying area 101, and circulate in this way.

[0079] Both ends of the second air duct 104 are connected to the second drying area 102 respectively. The second fan 111 allows the gas in the second drying area 102 to start from the second drying area 102, flow along the second air duct 104, pass through the second heat exchanger 108, the second heat exchange surface of the first heat exchange component 109 in sequence, and then flow into the second drying area 102, and circulate in this way.

[0080] The two ends of the first intermediate air duct 122 are respectively connected to the first intermediate drying area 120. The first intermediate fan 123 is used to make the gas in the first intermediate drying area 120 flow along the first intermediate air duct 122, sequentially through the first heat exchange surface of the first heat exchange component 109, the second intermediate heat exchange surface of the first intermediate heat exchange component 121, and then flow into the first intermediate drying area 120, and circulate in this way.

[0081] When N≥2: the 1st to N intermediate drying areas include the i-th intermediate drying area, the 1st to N intermediate heat exchange components include the i-th intermediate heat exchange component, the 1st to N intermediate air ducts include the i-th intermediate air duct, and the 1st to N intermediate fans include the i-th intermediate fan, wherein i is a positive integer and the value of i ranges from 1 to N-1.

[0082] Both ends of the first air duct 103 are connected to the first drying area 101 respectively. The first fan 110 is used to allow the first gas to start from the first drying area 101, flow along the first air duct 103, sequentially pass through the first intermediate heat exchange surface of the first intermediate heat exchange component 121, the first heat exchanger 107, and then flow into the first drying area 101, and circulate in this way.

[0083] Both ends of the second air duct 104 are respectively connected to the second drying area 102, and the second fan 111 is used to make the second gas start from the second drying area 102, flow along the second air duct 104, pass through the second heat exchanger 108, the second heat exchange surface of the first heat exchange component 109 in sequence, and then flow into the second drying area 102, and circulate in this way.

[0084] The two ends of the ith intermediate air duct are respectively connected to the ith intermediate drying area, and the ith intermediate fan is used to make the gas in the ith intermediate drying area flow along the ith intermediate air duct, sequentially through the first intermediate heat exchange surface of the i+1th intermediate heat exchange component and the second intermediate heat exchange surface of the ith intermediate heat exchange component, and then flow into the ith intermediate drying area, and circulate in this way. For example, when i=2, the two ends of the second intermediate air duct 126 are connected to the second intermediate drying area 124, and the second intermediate fan 127 is used to make the gas in the second intermediate drying area 124 flow along the second intermediate air duct 126, sequentially through the first intermediate heat exchange surface of the third intermediate heat exchange component and the second intermediate heat exchange surface of the second intermediate heat exchange component 125, and then flow into the second intermediate drying area 124, and circulate in this way.

[0085] The two ends of the Nth intermediate air duct are respectively connected to the Nth intermediate drying area. The Nth intermediate fan is used to make the gas in the Nth intermediate drying area flow along the Nth intermediate air duct, sequentially through the first heat exchange surface of the first heat exchange component 109 and the second intermediate heat exchange surface of the Nth intermediate heat exchange component, and then flow into the first intermediate drying area 120, and circulate in this way.

[0086] See also Figure 12 to Figure 14In an optional embodiment, the high-efficiency multi-stage drying system 100 further includes at least one precooling heat exchanger, the inlet of the precooling heat exchanger is used for the cooling medium to flow in, and the outlet is used for guiding the cooling medium to the drying area and the outside of the air duct, and the cooling medium is used for heat exchange with the gas. The precooling heat exchanger has the following three situations, and in the embodiment of the present invention, at least one of the following three situations is included:

[0087] The precooling heat exchanger is located upstream of the first intermediate heat exchange surface of the first intermediate heat exchange component 121 in the first air duct 103;

[0088] And / or, the precooling heat exchanger is located upstream of the second heat exchanger 108 in the second air duct 104; and / or, the precooling heat exchanger is located in at least one of the 1st to N-1 intermediate air ducts and upstream of the first intermediate heat exchange surface of the corresponding 2nd to N intermediate heat exchange components; for example, the precooling heat exchanger is located in the first intermediate air duct 122 and upstream of the first intermediate heat exchange surface of the second intermediate heat exchange component 125, or the precooling heat exchanger is located in the second intermediate air duct 126 and upstream of the first intermediate heat exchange surface of the third intermediate heat exchange component, etc.

[0089] And / or, the precooling heat exchanger is located upstream of the first intermediate heat exchange surface of the first intermediate heat exchange component 121 in the Nth intermediate air duct.

[0090] It should be understood that the pre-cooling heat exchanger can achieve pre-cooling of the gas, further improving efficiency.

[0091] In an optional implementation, the high-efficiency multi-stage drying system 100 further includes at least one drainage pipe, which in an embodiment of the present invention may include at least one of the following situations.

[0092] First case: Please refer to Fig.12 and Fig.13 , at least one precooling heat exchanger includes an mth intermediate precooling heat exchanger, when m=1, the mth intermediate precooling heat exchanger is the first intermediate precooling heat exchanger 128, and the first intermediate precooling heat exchanger 128 is located upstream of the first intermediate heat exchange surface of the first intermediate heat exchange component 121 in the first air duct 103; when m≥2, the mth intermediate precooling heat exchanger is located upstream of the first intermediate heat exchange surface of the mth intermediate heat exchange component in the m-1th intermediate air duct; at least one drain pipe includes a jth intermediate drain pipe, the jth intermediate drain pipe is connected to the first intermediate heat exchange surface of the jth intermediate heat exchange component by water, and the jth intermediate drain pipe is connected to the inlet of the mth intermediate precooling heat exchanger, and is used to drain condensed water to the mth intermediate precooling heat exchanger, wherein m and j are positive integers, and 1≤m≤j≤N;

[0093] The figure shows the situation when m=2. At this time, the second intermediate precooling heat exchanger 130 is located in the first intermediate air duct 122 and upstream of the first intermediate heat exchange surface of the second intermediate heat exchange component 125; at this time, the jth intermediate water pipe can be the first intermediate drain pipe 129 and / or the second intermediate drain pipe 131, and the jth intermediate heat exchange component includes the first intermediate heat exchange component 121 and the second intermediate heat exchange component 125.

[0094] When m=2, there are two cases:

[0095] First, j=1: the first intermediate drainage pipe 129 is connected to the first intermediate heat exchange surface or the nearby air duct of the first intermediate heat exchange component 121, and is used to drain the condensed water thereof to the first intermediate precooling heat exchanger 128;

[0096] Second, j=2: the second intermediate drainage pipe 131 is connected to the first intermediate heat exchange surface or the nearby air duct of the second intermediate heat exchange component 125, and is used to drain its condensed water to the first intermediate precooling heat exchanger 128 and / or the second intermediate precooling heat exchanger 130.

[0097] And / or, in the second case: see Fig.14 The high-efficiency multi-stage drying system 100 also includes a water receiving pan 133, which is arranged below the second heat exchanger 108. At least one drain pipe includes a first drain pipe 132, and the first drain pipe 132 is respectively connected to the water receiving pan 133 and the inlet of the precooling heat exchanger, and is used to drain the condensed water generated by the second heat exchanger 108 to any one of the at least one precooling heat exchangers; the precooling heat exchanger here can be a precooling heat exchanger at any position, including the precooling heat exchangers in the first case and the third case.

[0098] And / or, the third case: continue to refer to Fig.14 , at least one drain pipe includes a second drain pipe 134, the second drain pipe 134 is connected to the water circuit of the first heat exchange component 109, and is connected to the inlet of the precooling heat exchanger corresponding to the first heat exchange component 109 and located in the Nth intermediate air duct or the above-mentioned mth intermediate precooling heat exchanger, and is used to drain the condensed water generated by the first heat exchange component 109 to the precooling heat exchanger corresponding to the first heat exchange component 109; the precooling heat exchanger here can be any of the above-mentioned intermediate precooling heat exchangers, or a precooling heat exchanger located in the Nth intermediate air duct.

[0099] The high-efficiency multi-stage drying system 100 provided by the embodiment of the present invention has the following beneficial effects: the compression refrigeration cycle provides cold capacity Q through the second heat exchanger 108, and the overall power consumption is P. After the second gas passes through the second heat exchanger 108, it is cooled and releases heat energy Q. A part of the water is condensed and discharged. After the second gas passes through the first heat exchange component 109 and exchanges heat with the first gas, the second gas is heated and absorbs heat Q. After the first gas passes through the heat exchange process, it is cooled and releases heat energy Q. A part of the water is condensed. The second gas continues to flow into the second drying area 102 along the second air duct 104. The first gas continues to flow through the first heat exchanger 107 along the first air duct 103 and is heated, and then flows into the first drying area 101 to form a cycle. During the processing, the first gas and the second gas are cooled as a whole and release 2Q of heat energy, which is twice the cold capacity Q provided by the conventional compression refrigeration cycle. Moreover, the power consumption increased by the process is very limited, and only the power consumption of the heat exchange between the first gas and the second gas is increased, which is much less than the above-mentioned overall power consumption P. The embodiment of the present invention provides a more efficient and energy-saving heat pump drying system.

[0100] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-efficiency multi-stage drying system, characterized in that: It comprises a first drying area (101), a second drying area (102), a first air duct (103), a second air duct (104), a compressor (105), a throttling device (106), a first heat exchanger (107), a second heat exchanger (108), a first heat exchange component (109), a first fan (110) and a second fan (111); The exhaust port of the compressor (105) is connected to the inlet of the first heat exchanger (107), the outlet of the first heat exchanger (107) is connected to the inlet of the throttling device (106), the outlet of the throttling device (106) is connected to the inlet of the second heat exchanger (108), the outlet of the second heat exchanger (108) is connected to the suction port of the compressor (105), and the compressor (105), the first heat exchanger (107), the second heat exchanger (108), and the throttling device (106) are used to supply the circulation of the refrigerant; The first drying area (101) and the second drying area (102) are both used for drying objects to be dried, and the temperature of the first drying area (101) is greater than the temperature of the second drying area (102); The first heat exchange component (109) has a first heat exchange surface and a second heat exchange surface, the first heat exchange surface and the second heat exchange surface are capable of exchanging heat with gases flowing through them respectively, and the gas flowing through the first heat exchange surface does not contact the gas flowing through the second heat exchange surface; The inlet and outlet ends of the first air duct (103) are respectively connected to the first drying area (101); a first gas flows in the first air duct (103); the first fan (110) is used to make the first gas start from the first drying area (101), flow along the first air duct (103), sequentially pass through the first heat exchange surface of the first heat exchange component (109), the first heat exchanger (107), and then flow into the first drying area (101), and circulate in this way; The inlet and outlet ends of the second air duct (104) are respectively connected to the second drying area (102), and a second gas flows in the second air duct (104). The second fan (111) is used to make the second gas start from the second drying area (102), flow along the second air duct (104), pass through the second heat exchanger (108), the second heat exchange surface of the first heat exchange component (109) in sequence, and then flow into the second drying area (102), and circulate in this way.

2. The high-efficiency multi-stage drying system according to claim 1, characterized in that: The high-efficiency multi-stage drying system (100) further comprises a first water receiving pan (112) and a first water pipe (113); the first water receiving pan (112) is arranged below the second heat exchanger (108); the first water pipe (113) is connected to the first water receiving pan (112) and is used to drain water in the first water receiving pan (112) to areas outside the first drying area (101), the second drying area (102), the first air duct (103) and the second air duct (104).

3. The high-efficiency multi-stage drying system according to claim 1, characterized in that: The high-efficiency multi-stage drying system (100) further comprises a second water pipe (114), wherein the second water pipe (114) is used to guide condensed water generated by the first heat exchange component (109) to areas outside the first drying area (101), the second drying area (102), the first air duct (103) and the second air duct (104).

4. The high-efficiency multi-stage drying system according to any one of claims 1 to 3, characterized in that: The first air duct (103) is provided with a first bypass air duct (115), and the first bypass air duct (115) is connected to the upstream and downstream of the first heat exchange surface of the first heat exchange component (109); And / or, the second air duct (104) is provided with a second bypass air duct (116), and the second bypass air duct (116) is connected to the upstream and downstream of the second heat exchanger (108).

5. The high-efficiency multi-stage drying system according to claim 1, characterized in that: The high-efficiency multi-stage drying system (100) also includes a third heat exchanger (117), which is located upstream of the second heat exchanger (108) in the second air duct (104), and the second fan (111) is used to make the second gas flow out from the second drying area (102) along the second air duct (104), and flow into the second drying area (102) along the third heat exchanger (117), the second heat exchanger (108), and the second heat exchange surface of the first heat exchange component (109) in sequence.

6. The high-efficiency multi-stage drying system according to claim 5, characterized in that: The high-efficiency multi-stage drying system (100) further comprises a first water receiving tray (112) and a first water pipe (113), wherein the first water receiving tray (112) is arranged below the second heat exchanger (108), one end of the first water pipe (113) is connected to the first water receiving tray (112), and the other end is connected to the inlet of the third heat exchanger (117), so as to drain the water in the first water receiving tray (112) to the third heat exchanger (117).

7. The high-efficiency multi-stage drying system according to claim 1, 5 or 6, characterized in that: The high-efficiency multi-stage drying system (100) also includes a fourth heat exchanger (118), which is located upstream of the first heat exchange surface of the first heat exchange component (109) in the first air duct (103). The first fan (110) is used to make the first gas flow out from the first drying area (101) along the first air duct (103), flow through the fourth heat exchanger (118), the first heat exchange surface of the first heat exchange component (109), the first heat exchanger (107) in sequence, and then flow into the first drying area (101), and thus circulate.

8. The high-efficiency multi-stage drying system according to claim 7, characterized in that: The high-efficiency multi-stage drying system (100) also includes a second water pipe (114), which is used to divert condensed water generated by the first heat exchange surface of the first heat exchange component (109) to the fourth heat exchanger (118), and the outlet of the fourth heat exchanger (118) is connected to the drying area and the area outside the air duct.

9. The high-efficiency multi-stage drying system according to claim 8, characterized in that: The high-efficiency multi-stage drying system (100) further comprises a first water receiving tray (112) and a first water pipe (113), wherein the first water receiving tray (112) is arranged below the second heat exchanger (108), one end of the first water pipe (113) is connected to the first water receiving tray (112), and the other end is connected to the inlet of the fourth heat exchanger (118), so as to drain the water in the first water receiving tray (112) to the fourth heat exchanger (118), and the outlet of the fourth heat exchanger (118) is connected to all drying areas and areas outside the air duct.

10. The high-efficiency multi-stage drying system according to any one of claims 1 to 3, characterized in that: The high-efficiency multi-stage drying system (100) further comprises a second heat exchange component (119), wherein the second heat exchange component (119) comprises a third heat exchange surface and a fourth heat exchange surface, wherein the third heat exchange surface and the fourth heat exchange surface are capable of exchanging heat with gases flowing through the third heat exchange surface and the gas flowing through the fourth heat exchange surface does not contact each other; The third heat exchange surface of the second heat exchange component (119) is located downstream of the first heat exchange surface of the first heat exchange component (109) in the first air duct (103); the first fan (110) is used to allow the first gas to start from the first drying area (101), along the first air duct (103), sequentially pass through the first heat exchange surface of the first heat exchange component (109), the third heat exchange surface of the second heat exchange component (119), the first heat exchanger (107), and return to the first drying area (101); The fourth heat exchange surface of the second heat exchange component (119) is located upstream of the second heat exchanger (108) in the second air duct (104), and the second fan (111) is used to make the second gas start from the second drying area (102), flow through the fourth heat exchange surface of the second heat exchange component (119), the second heat exchanger (108), the second heat exchange surface of the first heat exchange component (109) in sequence, and return to the second drying area (102).

11. The high-efficiency multi-stage drying system according to any one of claims 1 to 3, characterized in that: The first heat exchange component (109) comprises a first channel and a second channel which are not connected, a heat conducting medium is arranged between the first channel and the second channel, the first channel forms the first heat exchange surface, and the second channel forms the second heat exchange surface; Alternatively, the first heat exchange component (109) comprises a first sub-heat exchanger (1091) and a second sub-heat exchanger (1092), the second sub-heat exchanger (1092) being located higher than the first sub-heat exchanger (1091), the first sub-heat exchanger (1091) and the second sub-heat exchanger (1092) being connected to form a closed cavity, the cavity being used to accommodate a refrigerant, the outer surface of the first sub-heat exchanger (1091) being the first heat exchange surface, and the outer surface of the second sub-heat exchanger (1092) being the second heat exchange surface; Alternatively, the first heat exchange component (109) includes a first sub-heat exchanger (1091), a second sub-heat exchanger (1092) and a water pump (1093); the first sub-heat exchanger (1091) and the second sub-heat exchanger (1092) are connected by a pipeline to form a closed circulation system, in which a medium flows; the water pump (1093) is arranged in the closed circulation system to circulate the medium in the system; the surface of the first sub-heat exchanger (1091) is the first heat exchange surface, and the outer surface of the second sub-heat exchanger (1092) is the second heat exchange surface.

12. An efficient multi-stage drying system, characterized in that: The invention comprises a first drying area (101), a second drying area (102), a first air duct (103), a second air duct (104), a compressor (105), a first heat exchange component (109), a throttling device (106), a first heat exchanger (107), a second heat exchanger (108), a first fan (110), a second fan (111), first to N intermediate air ducts, first to N intermediate drying areas, first to N intermediate heat exchange components, and first to N intermediate fans, wherein N is a positive integer greater than or equal to 1; The exhaust port of the compressor (105) is connected to the inlet of the first heat exchanger (107), the outlet of the first heat exchanger (107) is connected to the inlet of the throttling device (106), the outlet of the throttling device (106) is connected to the inlet of the second heat exchanger (108), and the outlet of the second heat exchanger (108) is connected to the suction port of the compressor (105); the compressor (105), the first heat exchanger (107), the second heat exchanger (108) and the throttling device (106) are used to circulate the refrigerant; The first drying area (101), the second drying area (102), and the first to N intermediate drying areas are all used to dry the objects to be dried, the temperature of the first drying area (101) is greater than the temperature of the second drying area (102), and the temperature of the first to N intermediate drying areas is less than the temperature of the first drying area (101) and greater than the temperature of the second drying area (102), and when N≥2, the temperature of the kth intermediate drying area is less than the temperature of the k-1th intermediate drying area, wherein k is a positive integer and the value of k ranges from 2 to N; The first heat exchange component (109) has a first heat exchange surface and a second heat exchange surface, the first heat exchange surface and the second heat exchange surface are capable of exchanging heat with gases flowing through them respectively, and the gas flowing through the first heat exchange surface does not contact the gas flowing through the second heat exchange surface; The first to N intermediate heat exchange components each have a first intermediate heat exchange surface and a second intermediate heat exchange surface, the first intermediate heat exchange surface and the second intermediate heat exchange surface are capable of exchanging heat with the gas flowing through each other, and the gas flowing through the first intermediate heat exchange surface does not contact the gas flowing through the second intermediate heat exchange surface; When N=1: The first to N intermediate drying areas are first intermediate drying areas (120), the first to N intermediate heat exchange components are first intermediate heat exchange components (121), the first to N intermediate air ducts are first intermediate air ducts (122), and the first to N intermediate fans are first intermediate fans (123); The two ends of the first air duct (103) are respectively connected to the first drying area (101); the first fan (110) causes the gas in the first drying area (101) to start from the first drying area (101), flow along the first air duct (103), sequentially pass through the first intermediate heat exchange surface of the first intermediate heat exchange component (121) and the first heat exchanger (107), and then flow into the first drying area (101), thereby circulating; The two ends of the second air duct (104) are respectively connected to the second drying area (102); the second fan (111) causes the gas in the second drying area (102) to start from the second drying area (102), flow along the second air duct (104), sequentially pass through the second heat exchanger (108), the second heat exchange surface of the first heat exchange component (109), and then flow into the second drying area (102), thereby circulating; The two ends of the first intermediate air duct (122) are respectively connected to the first intermediate drying area (120); the first intermediate fan (123) is used to make the gas in the first intermediate drying area (120) flow along the first intermediate air duct (122), sequentially pass through the first heat exchange surface of the first heat exchange component (109), the second intermediate heat exchange surface of the first intermediate heat exchange component (121), and then flow into the first intermediate drying area (120), thereby circulating; When N ≥ 2: The 1st to Nth intermediate drying areas include the i-th intermediate drying area, the 1st to Nth intermediate heat exchange components include the i-th intermediate heat exchange component, the 1st to Nth intermediate air ducts include the i-th intermediate air duct, and the 1st to Nth intermediate fans include the i-th intermediate fan, wherein i is a positive integer, and the value of i ranges from 1 to N-1; The two ends of the first air duct (103) are respectively connected to the first drying area (101); the first fan (110) is used to make the first gas in the first drying area (101) start from the first drying area (101), flow along the first air duct (103), sequentially pass through the first intermediate heat exchange surface of the first intermediate heat exchange component (121), the first heat exchanger (107), and then flow into the first drying area (101), and circulate in this way; The two ends of the second air duct (104) are respectively connected to the second drying area (102), and the second fan (111) is used to make the second gas in the second drying area (102) start from the second drying area (102), flow along the second air duct (104), sequentially pass through the second heat exchanger (108), the second heat exchange surface of the first heat exchange component (109), and then flow into the second drying area, and circulate in this way; The two ends of the i-th intermediate air duct are respectively connected to the i-th intermediate drying area, and the i-th intermediate fan is used to make the gas in the i-th intermediate drying area flow along the i-th intermediate air duct, sequentially through the first intermediate heat exchange surface of the i+1th intermediate heat exchange component, the second intermediate heat exchange surface of the i-th intermediate heat exchange component, and then flow into the i-th intermediate drying area, and circulate in this way; The two ends of the Nth intermediate air duct are respectively connected to the Nth intermediate drying area. The Nth intermediate fan is used to make the gas in the Nth intermediate drying area flow along the Nth intermediate air duct, sequentially through the first heat exchange surface of the first heat exchange component (109) and the second intermediate heat exchange surface of the Nth intermediate heat exchange component, and then flow into the first intermediate drying area (120), and circulate in this way.

13. The high-efficiency multi-stage drying system according to claim 12, characterized in that: The high-efficiency multi-stage drying system (100) further comprises at least one pre-cooling heat exchanger, wherein the inlet of the pre-cooling heat exchanger is used for the cooling medium to flow in, and the outlet is used for guiding the cooling medium to the drying area and outside the air duct, and the cooling medium is used for exchanging heat with the gas; The precooling heat exchanger is located upstream of the first intermediate heat exchange surface of the first intermediate heat exchange component (121) in the first air duct (103); and / or, the precooling heat exchanger is located upstream of the second heat exchanger (108) in the second air duct (104); and / or, the precooling heat exchanger is located in at least one of the 1st to N-1st intermediate air ducts and upstream of the first intermediate heat exchange surface of the corresponding 2nd to Nth intermediate heat exchange components; And / or, the precooling heat exchanger is located upstream of the first intermediate heat exchange surface of the first intermediate heat exchange component (121) in the Nth intermediate air duct.

14. The high-efficiency multi-stage drying system according to claim 13, characterized in that: The high-efficiency multi-stage drying system (100) further comprises at least one drainage pipe; The at least one precooling heat exchanger includes an mth intermediate precooling heat exchanger, and when m=1, the mth intermediate precooling heat exchanger is a first intermediate precooling heat exchanger (128), and the first intermediate precooling heat exchanger (128) is located upstream of a first intermediate heat exchange surface of the first intermediate heat exchange component (121) in the first air duct (103); when m≥2, the mth intermediate precooling heat exchanger is located upstream of a first intermediate heat exchange surface of the mth intermediate heat exchange component in an (m-1)th intermediate air duct; the at least one drain pipe includes a jth intermediate drain pipe, the jth intermediate drain pipe is in water communication with the first intermediate heat exchange surface of the jth intermediate heat exchange component, the jth intermediate drain pipe is connected to an inlet of the mth intermediate precooling heat exchanger, and is used to drain condensed water to the mth intermediate precooling heat exchanger, wherein m and j are positive integers, and 1≤m≤j≤N; And / or, the high-efficiency multi-stage drying system (100) further comprises a water receiving pan (133), the water receiving pan (133) being arranged below the second heat exchanger (108), the at least one drain pipe comprising a first drain pipe (132), the first drain pipe (132) being respectively connected to the water receiving pan (133) and the inlet of the precooling heat exchanger, and being used for draining condensed water generated by the second heat exchanger (108) to any one of the at least one precooling heat exchanger; And / or, the at least one drain pipe includes a second drain pipe (134), the second drain pipe (134) is connected to the water circuit of the first heat exchange component (109), and is connected to the inlet of the precooling heat exchanger located in the Nth intermediate air duct or the mth intermediate precooling heat exchanger corresponding to the first heat exchange component (109), and is used to drain the condensed water generated by the first heat exchange component (109) to the precooling heat exchanger corresponding to the first heat exchange component (109).

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