Rotary wheel dehumidification system

Abstract

The utility model discloses a rotary wheel dehumidification system, which belongs to the technical field of rotary wheel dehumidification and comprises a dehumidification rotary wheel, a dehumidification air supply flow path, a heating regeneration flow path, a low-temperature refrigerant circulation loop and a medium-temperature refrigerant circulation loop. The dehumidification air supply flow path and the heating regeneration flow path both pass through the dehumidification rotating wheel, the dehumidification rotating wheel is used for adsorbing moisture in the dehumidification air supply flow path, and the heating regeneration flow path is used for generating regeneration air to perform regeneration treatment on the dehumidification rotating wheel; the low-temperature refrigerant circulation loop exchanges heat with the dehumidification air supply flow path and is used for recovering heat in the dehumidification air supply flow path; the medium-temperature refrigerant circulation loop exchanges heat with the low-temperature refrigerant circulation loop and the heating regeneration flow path and is used for recycling regenerated air exhaust heat and heat transmitted by the low-temperature refrigerant circulation loop and preheating regenerated air, the heat exchange temperature difference is reduced as much as possible through graded recycling of heat, the stability of a heat source is improved, and the heat exchange efficiency is improved. And the total amount of available heat energy is greatly increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of rotary dehumidification, in particular to a rotary dehumidification system. Background Art

[0002] The lithium battery production process places stringent requirements on workshop humidity, with some workshops requiring a dew point below -40°C. Battery production yield is closely linked to workshop humidity. Problems such as battery bulging and leakage are all related to excessive moisture in the air. Maintaining workshop humidity within a reasonable range is crucial to improving production yield and reducing costs.

[0003] Among various dehumidification solutions, rotary dehumidification is the most widely used in the lithium battery production industry. It offers advantages such as a wide dehumidification temperature range, strong deep dehumidification capabilities, and a simple structure. Moist air flowing through the rotary wheel, under the influence of the water vapor pressure difference, is fully absorbed by the special material of the rotary wheel, achieving deep dehumidification. To ensure continuous and stable dehumidification, the rotary wheel must be regenerated.

[0004] Conventional heat pump direct expansion coupling schemes can use the heat absorbed by the front surface cooler to preheat the regeneration air. However, this scheme has a low upper limit on the preheating temperature and is significantly constrained by ambient temperature and fresh air volume, resulting in limited heating effectiveness at low temperatures. For example, Chinese patent application number 2014200389763 discloses a low-temperature dryer that couples a compression heat pump with a rotary adsorption dehumidifier. The dryer comprises at least one refrigeration system and an adsorption dehumidifier rotary system. This system relies on atmospheric cooling for supercooling, which, while effective, has limited preheating effect on the regeneration air. Summary of the Invention

[0005] The utility model provides a rotary dehumidification system, which designs a low-temperature refrigerant circulation loop to absorb heat in the rotary dehumidification process, and designs a medium-temperature refrigerant circulation loop to recover heat in the low-temperature refrigerant circulation loop and heats the waste heat of the regeneration air exhaust in the regeneration flow path, thereby preheating the regeneration air, improving the stability of the heat source, and greatly increasing the total amount of available regeneration air preheating thermal energy.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] The utility model provides a rotary dehumidification system, comprising: a dehumidification rotary wheel, a dehumidification air supply flow path, a heating and regeneration flow path, a low-temperature refrigerant circulation circuit and a medium-temperature refrigerant circulation circuit;

[0008] The dehumidification air supply flow path and the heating and regeneration flow path are both connected to the dehumidification wheel. The dehumidification wheel is used to absorb moisture in the dehumidification air supply flow path, and the heating and regeneration flow path is used to generate regeneration air to regenerate the dehumidification wheel.

[0009] The low-temperature refrigerant circulation loop exchanges heat with the dehumidification air supply flow path to recover heat in the dehumidification air supply flow path;

[0010] The medium-temperature refrigerant circulation circuit exchanges heat with the low-temperature refrigerant circulation circuit and the heating regeneration flow circuit respectively, so as to recover the exhaust heat of the regeneration air and the heat transferred by the low-temperature refrigerant circulation circuit, and preheat the regeneration air.

[0011] The low-temperature refrigerant circulation circuit absorbs the heat in the dehumidification air supply flow path, and the medium-temperature refrigerant circulation circuit absorbs the waste heat of the regeneration air exhaust in the heating regeneration flow path. The medium-temperature refrigerant circulation circuit also absorbs the heat transmitted by the low-temperature refrigerant circulation circuit, and recovers the heat in a graded manner, thereby increasing the source of regeneration air preheating heat energy, reducing overall energy consumption, and realizing an efficient dehumidification and rotor regeneration process.

[0012] Optionally, the low-temperature refrigerant circulation loop is connected to a condenser evaporator, a primary evaporator and a secondary evaporator;

[0013] The low-temperature refrigerant circulation circuit exchanges heat with the dehumidification air supply flow path through the primary evaporator and the secondary evaporator, and exchanges heat with the medium-temperature refrigerant circulation circuit through the condensing evaporator, wherein the low-temperature refrigerant circulation circuit is connected to the hot end of the condensing evaporator.

[0014] The low-temperature refrigerant circulation loop realizes the effective recovery of heat in the dehumidification air supply flow path through the setting of multi-stage evaporators, and exchanges heat with the medium-temperature refrigerant circulation loop. This multi-stage heat exchange process improves the utilization rate of thermal energy and realizes the cascade utilization of energy.

[0015] Optionally, the low-temperature refrigerant circulation loop is further connected to a primary expansion valve, a secondary expansion valve and a low-temperature compressor;

[0016] The primary evaporator is connected to its matching primary expansion valve to form a primary loop, and the secondary evaporator is connected to its matching secondary expansion valve to form a secondary loop. The primary loop and the secondary loop are connected in parallel.

[0017] The inlets of the first-stage expansion valve and the second-stage expansion valve are respectively connected to the hot end outlet of the condenser evaporator;

[0018] The inlet of the low-temperature compressor is connected to the cold end outlet of the first evaporator and the cold end outlet of the second evaporator respectively, and the outlet of the low-temperature compressor is connected to the hot end inlet of the condensing evaporator.

[0019] The setting of the first-stage expansion valve and the second-stage expansion valve enables precise control of the refrigerant flow rate and optimizes the efficiency of the refrigeration cycle; the use of a low-temperature compressor improves the cooling capacity of the system, and the parallel design of each evaporator and its supporting expansion valve with the condensing evaporator increases the flexibility and reliability of the system.

[0020] Optionally, the medium-temperature refrigerant circulation circuit is connected to a condenser evaporator and a condenser;

[0021] The medium-temperature refrigerant circulation circuit exchanges heat with the low-temperature refrigerant circulation circuit through the condenser evaporator, and exchanges heat with the heating and regeneration flow path through the condenser and the condenser evaporator, wherein the medium-temperature refrigerant circulation circuit is connected to the cold end of the condenser evaporator.

[0022] Through the setting of the condensing evaporator and the condenser, the effective recovery of heat in the low-temperature refrigerant circulation circuit and the heating regeneration flow path is achieved. The configuration of the medium-temperature refrigerant circulation circuit improves the system's utilization efficiency of high-temperature heat.

[0023] Optionally, the medium-temperature refrigerant circulation circuit is further connected to a medium-temperature compressor and a medium-temperature expansion valve;

[0024] The cold end outlet of the condenser evaporator is connected to the medium temperature compressor, the hot end of the condenser, and the inlet of the medium temperature expansion valve in sequence. The outlet of the medium temperature expansion valve is connected to the cold end inlet of the condenser evaporator to form a loop.

[0025] The use of medium-temperature compressors and medium-temperature expansion valves enables precise control of the medium-temperature refrigerant cycle, optimizes the performance of the heat pump system, and performs two-stage compression based on the heat grade using low-temperature compressors and medium-temperature compressors, further increasing the compressor temperature rise and reducing the electric heater temperature rise, thereby reducing the energy consumption of the dehumidification system.

[0026] Optionally, the dehumidification wheel is a two-stage dehumidification wheel, including a primary wheel and a secondary wheel;

[0027] The primary rotor has a primary rotor adsorption area and a primary rotor regeneration area;

[0028] The secondary rotor has a secondary rotor adsorption zone, a secondary rotor regeneration zone and a secondary rotor heat recovery zone;

[0029] The dehumidification air supply flow path passes through the primary rotor adsorption zone and the secondary rotor adsorption zone in sequence, and the heating regeneration flow path passes through the secondary rotor heat recovery zone, the secondary rotor regeneration zone and the primary rotor regeneration zone in sequence.

[0030] By setting up a first-stage rotor and a second-stage rotor, graded adsorption of moisture in the air is achieved, thereby improving the dehumidification efficiency. At the same time, by setting up an adsorption zone and a regeneration zone, sustainable and stable operation of the rotor is achieved.

[0031] Optionally, the dehumidification air supply flow path includes an air flow path between the fresh air inlet A and the air supply outlet C and an air flow path between the return air inlet B and the air supply outlet C;

[0032] The fresh air inlet A is opened at the input end of the dehumidification air supply flow path, the return air inlet B is opened on the dehumidification air supply flow path between the first-level rotor adsorption area and the second-level rotor adsorption area, and the air supply outlet C is opened at the output end of the dehumidification air supply flow path. The fresh air enters the flow path from the fresh air inlet A, is processed by the first-level rotor adsorption area, and merges with the return air entering the flow path from the return air inlet B. After being processed by the second-level rotor adsorption area, it flows out from the air supply outlet C.

[0033] Through the reasonable layout of the fresh air inlet A, return air inlet B and supply air inlet C, the effective mixing and processing of fresh air and return air is achieved, the dehumidification effect is improved, and the uniformity and continuity of the air flow are guaranteed through the setting of the supply air fan.

[0034] Optionally, the dehumidification air supply flow path further includes an air supply fan and a surface cooler, and the fresh air flows from the fresh air inlet A in sequence through the hot end of the first-stage evaporator, the first-stage rotor adsorption area, the air supply fan, the hot end of the second-stage evaporator, the second-stage rotor adsorption area and the surface cooler to reach the air supply outlet C;

[0035] The return air port B is connected to the inlet of the air supply fan.

[0036] Optionally, the heating and regeneration flow path includes an air flow path between the regeneration air inlet D and the exhaust port E;

[0037] The regeneration air inlet D is connected to the hot end outlet of the secondary evaporator, and the exhaust port E is opened at the output end of the heating and regeneration flow path. The regeneration air flows in from the regeneration air inlet D, passes through the secondary rotor hot zone and the condenser for preheating, and is further heated by the primary electric heater. After reaching the regeneration temperature, it passes through the secondary rotor regeneration zone and the primary rotor regeneration zone in sequence and flows out from the exhaust port E.

[0038] By setting the regeneration air inlet D upstream of the secondary rotor heat return zone, the heating regeneration flow path can absorb the heat of the secondary rotor. Combined with the heating capacity of the condenser, more effective preheating of the regeneration air is achieved, ensuring the effective regeneration of the rotor. Combined with the use of an electric heater, the temperature of the regeneration air is further increased, ensuring the efficiency of the rotor regeneration.

[0039] Optionally, the heating and regeneration flow path further includes a regeneration fan and a secondary electric heater;

[0040] The inlet of the regeneration fan is connected to the secondary rotor regeneration zone, and the outlet of the regeneration fan is connected to the primary rotor regeneration zone via the secondary electric heater.

[0041] Compared with the prior art, the present invention achieves the following beneficial effects: heat is recovered from the supply air dehumidification flow path during the dehumidification process at a relatively low temperature by the low-temperature refrigerant circulation loop, and heat is recovered from the regeneration exhaust air at a relatively high temperature by the medium-temperature refrigerant circulation loop. Simultaneously, the medium-temperature refrigerant circulation loop also absorbs heat transferred by the low-temperature refrigerant circulation loop. The heat exchange temperature difference is minimized as much as possible through the graded heat recovery, greatly improving heat utilization efficiency. This not only improves the stability of the heat source but also significantly increases the total amount of available thermal energy. The low-temperature compressor and the medium-temperature compressor form a cascade compressor, which can heat the air at the condenser end to above 90°C, a higher temperature rise than conventional compressors, reducing the temperature rise of the electric heater, thereby increasing the preheating temperature of the regeneration air and reducing the regeneration heating energy consumption. Two parallel evaporators and a condensing evaporator absorb the heat of the fresh air, the heat of the mixed air before the secondary rotor, and the waste heat of the regeneration exhaust air, respectively, and preheat the regeneration air through the condenser. The preheated regeneration air is then heated by the primary electric heater to gradually reach the regeneration temperature. In scenarios with large temperature rises, the above components achieve graded heating, reducing the temperature difference of a single heating, and further improving energy utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 Shown is a structural schematic diagram of a rotary dehumidification system in an embodiment of the present invention.

[0043] In the figure: 100, medium-temperature refrigerant circulation circuit; 200, low-temperature refrigerant circulation circuit; 1, first-stage rotor; 1-1, first-stage rotor adsorption zone; 1-2, first-stage rotor regeneration zone; 2, second-stage rotor; 2-1, second-stage rotor adsorption zone; 2-2, second-stage rotor regeneration zone; 2-3, second-stage rotor heat return zone; 3, condenser evaporator; 4, first-stage expansion valve; 5, second-stage expansion valve; 6, first-stage evaporator; 7, second-stage evaporator; 8, low-temperature compressor; 9, medium-temperature compressor; 10, condenser; 11, medium-temperature expansion valve; 12, air supply fan; 13, rear surface cooler; 14, first-stage electric heater; 15, regeneration fan; 16, second-stage electric heater. DETAILED DESCRIPTION

[0044] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are not intended to limit the scope of protection of the present invention.

[0045] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0046] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0047] Example 1

[0048] This embodiment provides a rotary dehumidification system, comprising:

[0049] Dehumidification wheel, dehumidification air supply flow path, heating and regeneration flow path, low-temperature refrigerant circulation circuit 200 and medium-temperature refrigerant circulation circuit 100;

[0050] The dehumidification air supply flow path and the heating and regeneration flow path are both connected to the dehumidification wheel. The dehumidification wheel is used to absorb moisture in the dehumidification air supply flow path, and the heating and regeneration flow path is used to generate regeneration air to regenerate the dehumidification wheel.

[0051] The low-temperature refrigerant circulation loop 200 exchanges heat with the dehumidification air supply flow path to recover heat in the dehumidification air supply flow path;

[0052] The medium-temperature refrigerant circulation circuit 100 exchanges heat with the low-temperature refrigerant circulation circuit 200 and the heating and regeneration flow path respectively, for recovering the exhaust heat of the regeneration air and the heat transferred by the low-temperature refrigerant circulation circuit 200, and preheating the regeneration air.

[0053] Example 2

[0054] Based on Example 1, this example also makes the following design.

[0055] Reference Figure 1 In this embodiment, the low-temperature refrigerant circulation loop 200 exchanges heat with the dehumidification air supply flow path through the parallel primary evaporator 6 and the secondary evaporator 7, so as to recover the heat in the dehumidification air supply flow path; the low-temperature refrigerant circulation loop 200 transports heat to the medium-temperature refrigerant circulation loop 100 through the condensing evaporator 3; the medium-temperature refrigerant circulation loop 100 exchanges heat with the heating and regeneration flow path through the condensing evaporator 3 and the condenser 10, mainly for recovering the waste heat of the regeneration air exhaust and the heat of the low-temperature refrigerant circulation loop 200, and preheating the heating and regeneration flow path, wherein the temperature range of the low-temperature refrigerant circulation loop 200 is approximately -5°C ~ 50°C, and the temperature range of the medium-temperature refrigerant circulation loop 100 is approximately 50°C ~ 90°C.

[0056] In this embodiment, the low-temperature refrigerant circulation loop 200 includes a condenser evaporator 3, a first-level expansion valve 4, a second-level expansion valve 5, a first-level evaporator 6, a second-level evaporator 7 and a low-temperature compressor 8. The condenser evaporator 3 includes a hot end and a cold end. The first-level evaporator 6 and its matching first-level expansion valve 4 and the second-level evaporator 7 and its matching second-level expansion valve 5 are connected in parallel. The hot end outlet of the condenser evaporator 3, that is, the condenser outlet of the condenser evaporator 3, is respectively connected to the inlets of the first-level expansion valve 4 and the second-level expansion valve 5. The inlet of the low-temperature compressor 8 is respectively connected to the outlet of the first-level evaporator 6 and the outlet of the second-level evaporator 7. The outlet of the low-temperature compressor 8 is connected to the hot end inlet of the condenser evaporator 3.

[0057] In the low-temperature refrigerant circulation loop 200, the refrigerant absorbs heat and evaporates in the primary evaporator 6 and the secondary evaporator 7 respectively, wherein the primary evaporator 6 absorbs the heat of the fresh air, and the secondary evaporator 7 absorbs the heat of the mixed air of the fresh air and the return air. The two refrigerants merge and enter the low-temperature compressor 8 for compression. The compressed refrigerant enters the hot end of the condensing evaporator 3 for condensation and heat release, and transfers the heat to the medium-temperature refrigerant circulation loop 100. After condensation, the refrigerant is divided into two paths and enters the primary expansion valve 4 and the secondary expansion valve 5 respectively. After expansion, it returns to the primary evaporator 6 and the secondary evaporator 7 respectively to form a loop.

[0058] In this embodiment, the medium-temperature refrigerant circulation loop 100 includes a condenser evaporator 3, a medium-temperature compressor 9, a condenser 10 and a medium-temperature expansion valve 11 connected in sequence to form a loop. The cold end outlet of the condenser evaporator 3, that is, the evaporator outlet in the condenser evaporator 3, is connected in sequence to the medium-temperature compressor 9, the condenser 10 and the inlet of the medium-temperature expansion valve 11, and the outlet of the medium-temperature expansion valve 11 is connected to the cold end inlet of the condenser evaporator 3, that is, the evaporator inlet in the condenser evaporator 3.

[0059] In the medium-temperature refrigerant circulation loop 100, the refrigerant evaporates at the cold end of the condenser evaporator 3 and absorbs heat. The heat sources are the moist and hot regenerated exhaust air and the heat at the hot end of the condenser evaporator 3. The refrigerant after absorbing heat enters the medium-temperature compressor 9 for compression, and the high-temperature and high-pressure refrigerant enters the condenser 10 for condensation and heat release. Finally, it expands through the medium-temperature expansion valve 11 and returns to the condenser evaporator 3 to evaporate and absorb heat.

[0060] In this embodiment, the dehumidification wheel includes a first-stage wheel 1 and a second-stage wheel 2. The first-stage wheel 1 includes an adsorption zone 1-1 and a regeneration zone 1-2. The second-stage wheel 2 includes an adsorption zone 2-1, a regeneration zone 2-2 and a heat recovery zone 2-3. The dehumidification air supply flow path passes through the first-stage wheel adsorption zone 1-1 and the second-stage wheel adsorption zone 2-1 in sequence, and the heating and regeneration flow path passes through the second-stage wheel heat recovery zone 2-3, the second-stage wheel regeneration zone 2-2 and the first-stage wheel regeneration zone 1-2 in sequence.

[0061] The dehumidification air supply flow path includes an air flow path between the fresh air inlet A and the air supply outlet C, and the return air flows into the dehumidification air supply flow path from the return air inlet B. From the fresh air inlet A to the air supply outlet C, the first-level evaporator 6, the first-level rotor adsorption area 1-1, the air supply fan 12, the second-level evaporator 7, the second-level rotor adsorption area 2-1 and the rear surface cooler 13 are arranged and connected in sequence, and the return air inlet B is connected to the inlet of the air supply fan 12.

[0062] The heating and regeneration flow path includes an air flow path between the regeneration air inlet D and the exhaust port E, and is sequentially arranged and connected with the secondary rotor heat recovery zone 2-3, the condenser 10, the primary electric heater 14, the secondary rotor regeneration zone 2-2, the regeneration fan 15, the secondary electric heater 16, the primary rotor regeneration zone 1-2 and the condensing evaporator 3, and the outlet of the regeneration air inlet D and the secondary evaporator 7.

[0063] In this embodiment, in the dehumidification air supply path, fresh air passes through the primary evaporator 6 and is cooled to below 12°C, reaching the required dehumidification temperature. After the mixed air passes through the secondary evaporator 7, its temperature is also cooled to below 12°C, reaching the required dehumidification temperature. Compared to conventional dehumidification units, this system eliminates the need for additional chilled water cooling, saving dehumidification energy.

[0064] In this embodiment, the low-temperature refrigerant circulation circuit 200 recovers heat from the fresh air and mixed air via the primary evaporator 6 and the secondary evaporator 7, and transfers this heat to the medium-temperature refrigerant circulation circuit 100 through heat exchange between the hot and cold ends of the condensing evaporator 3. Simultaneously, the cold end of the condensing evaporator 3 recovers heat from the regenerated exhaust air, and both heat components are used to preheat the regenerated air via the medium-temperature compressor 9 and the condenser 10. Compared to conventional dehumidification units, this significantly reduces the heating temperature rise of the electric heater and significantly reduces dehumidifier power consumption. Compared to conventional heat pump-coupled dehumidifiers, this system increases the stability of the heat source, allowing the heat from the fresh air, mixed air, and regenerated exhaust air to be utilized separately, thereby improving the operating efficiency of the heat pump.

[0065] Example 3

[0066] This embodiment provides a lithium battery production workshop, which applies the heat pump coupled rotary dehumidification system described in Example 2.

[0067] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A rotary dehumidification system, characterized in that: include: A dehumidification wheel, a dehumidification air supply flow path, a heating and regeneration flow path, a low-temperature refrigerant circulation circuit (200), and a medium-temperature refrigerant circulation circuit (100); The dehumidification air supply flow path and the heating and regeneration flow path are both connected to the dehumidification wheel. The dehumidification wheel is used to absorb moisture in the dehumidification air supply flow path, and the heating and regeneration flow path is used to generate regeneration air to regenerate the dehumidification wheel. The low-temperature refrigerant circulation circuit (200) exchanges heat with the dehumidification air supply flow path to recover heat in the dehumidification air supply flow path; The medium-temperature refrigerant circulation circuit (100) exchanges heat with the low-temperature refrigerant circulation circuit (200) and the heating and regeneration flow path, respectively, to recover the heat of the regeneration air exhaust and the heat transferred by the low-temperature refrigerant circulation circuit (200), and to preheat the regeneration air; The dehumidification wheel comprises a primary wheel (1) and a secondary wheel (2); The primary rotor (1) comprises a primary rotor adsorption zone (1-1) and a primary rotor regeneration zone (1-2); The secondary rotor (2) comprises a secondary rotor adsorption zone (2-1), a secondary rotor regeneration zone (2-2) and a secondary rotor heat recovery zone (2-3); The dehumidification air supply flow path passes through the first-stage rotor adsorption zone (1-1) and the second-stage rotor adsorption zone (2-1) in sequence, and the heating and regeneration flow path passes through the second-stage rotor heat return zone (2-3), the second-stage rotor regeneration zone (2-2) and the first-stage rotor regeneration zone (1-2) in sequence.

2. The rotary dehumidification system according to claim 1, characterized in that: The low-temperature refrigerant circulation circuit (200) is connected to a condenser evaporator (3), a primary evaporator (6), and a secondary evaporator (7); The low-temperature refrigerant circulation circuit (200) exchanges heat with the dehumidification air supply flow path through the primary evaporator (6) and the secondary evaporator (7), and exchanges heat with the medium-temperature refrigerant circulation circuit (100) through the condensing evaporator (3), wherein the low-temperature refrigerant circulation circuit (200) is connected to the hot end of the condensing evaporator (3).

3. The rotary dehumidification system according to claim 2, characterized in that: The low-temperature refrigerant circulation circuit (200) is further connected to a primary expansion valve (4), a secondary expansion valve (5) and a low-temperature compressor (8); The primary evaporator (6) is connected to its matching primary expansion valve (4) to form a primary loop, and the secondary evaporator (7) is connected to its matching secondary expansion valve (5) to form a secondary loop, and the primary loop and the secondary loop are connected in parallel; The inlets of the first-stage expansion valve (4) and the second-stage expansion valve (5) are respectively connected to the hot end outlet of the condenser evaporator (3); The inlet of the low-temperature compressor (8) is connected to the cold end outlet of the first-stage evaporator (6) and the cold end outlet of the second-stage evaporator (7), respectively, and the outlet of the low-temperature compressor (8) is connected to the hot end inlet of the condensing evaporator (3).

4. The rotary dehumidification system according to claim 3, characterized in that: The medium-temperature refrigerant circulation circuit (100) is connected to a condenser evaporator (3) and a condenser (10); The medium-temperature refrigerant circulation circuit (100) exchanges heat with the low-temperature refrigerant circulation circuit (200) through the condenser evaporator (3), and exchanges heat with the heating and regeneration flow path through the condenser (10) and the condenser evaporator (3), wherein the medium-temperature refrigerant circulation circuit (100) is connected to the cold end of the condenser evaporator (3).

5. The rotary dehumidification system according to claim 4, characterized in that: The medium-temperature refrigerant circulation circuit (100) is further connected to a medium-temperature compressor (9) and a medium-temperature expansion valve (11); The cold end outlet of the condenser evaporator (3) is connected in sequence to the medium-temperature compressor (9), the hot end of the condenser (10), and the inlet of the medium-temperature expansion valve (11), and the outlet of the medium-temperature expansion valve (11) is connected to the cold end inlet of the condenser evaporator (3) to form a loop.

6. The rotary dehumidification system according to claim 1, characterized in that: The dehumidification air supply flow path includes the air flow path between the fresh air inlet A and the air supply outlet C and the air flow path between the return air inlet B and the air supply outlet C; The fresh air inlet A is opened at the input end of the dehumidification air supply flow path, the return air inlet B is opened on the dehumidification air supply flow path between the first-stage rotor adsorption area (1-1) and the second-stage rotor adsorption area (2-1), and the air supply outlet C is opened at the output end of the dehumidification air supply flow path. Fresh air enters the flow path from the fresh air inlet A, is processed by the first-stage rotor adsorption area (1-1), and then merges with the return air entering the flow path from the return air inlet B. After being processed by the second-stage rotor adsorption area (2-1), it flows out from the air supply outlet C.

7. The rotary dehumidification system according to claim 6, characterized in that: The dehumidification air supply flow path also includes an air supply fan (12) and a surface cooler (13), and fresh air flows from the fresh air inlet A through the hot end of the first-stage evaporator (6), the first-stage rotor adsorption area (1-1), the air supply fan (12), the hot end of the second-stage evaporator (7), the second-stage rotor adsorption area (2-1) and the surface cooler (13) to reach the air supply outlet C; The return air port B is connected to the inlet of the air supply fan (12).

8. The rotary dehumidification system according to claim 7, characterized in that: The heating and regeneration flow path includes an air flow path between the regeneration air inlet D and the exhaust port E; The regeneration air inlet D is connected to the hot end outlet of the secondary evaporator (7), and the exhaust port E is opened at the output end of the heating and regeneration flow path. The regeneration air flows in from the regeneration air inlet D, passes through the secondary rotor heat zone (2-3), is preheated by the condenser (10), and is further heated by the primary electric heater (14). After reaching the regeneration temperature, it passes through the secondary rotor regeneration zone (2-2) and the primary rotor regeneration zone (1-2) in sequence and flows out from the exhaust port E.

9. The rotary dehumidification system according to claim 8, characterized in that: The heating and regeneration flow path further includes a regeneration fan (15) and a secondary electric heater (16); The inlet of the regeneration fan (15) is connected to the secondary rotor regeneration zone (2-2), and the outlet of the regeneration fan (15) is connected to the primary rotor regeneration zone (1-2) via the secondary electric heater (16).

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