Double-rotor low-dew-point dehumidifier and production device dehumidification system using the same

Abstract

The application relates to a double-rotor low-dew-point dehumidifier and a production device dehumidification system using the dehumidifier. The double-rotor low-dew-point dehumidifier adopts a series two-stage dehumidification adsorption rotor, circulating airflow does not need to pass through two-stage adsorption, the airflow transportation distance of large-flow circulating airflow is reduced, energy consumption is saved, and the temperature of air supplied in the whole season can be ensured to be lower than 20 DEG C. Meanwhile, the airflow passing amount of the first adsorption rotor assembly is reduced, so that the first adsorption rotor assembly can not be provided with a cooling area, the first adsorption rotor assembly is miniaturized, and production cost is saved. In addition, the regenerated airflow generated by the second adsorption rotor assembly can be recycled, waste heat utilization can be strengthened, energy waste is avoided to the maximum extent, production cost is saved, and market application is facilitated.

Description

Technical Field

[0001] This invention relates to a dual-rotor low dew point dehumidifier and a dehumidification system for a production unit using the dehumidifier, particularly a solution for achieving low dew point dehumidification of a production unit by combining dual rotors with a circulating air path. Background Technology

[0002] The humidity of the air in the production environment of some precision products (such as lithium batteries) has a significant impact on product quality. Therefore, production needs to be carried out in a drying room. Drying rooms are also widely used in the pharmaceutical, hospital, electronics, computer, and food industries. These drying rooms are generally located in low dew point environments with a dew point temperature below -40℃. Currently, common low dew point drying rooms mainly use rotary adsorption dehumidifiers to treat the air. To achieve better dehumidification effects, manufacturers often use two-stage rotary adsorption systems connected in series, such as... Figure 1 As shown, in the prior art, the fresh air and the circulating gas from the drying room 3000 are mixed and then pass through the first rotor 1000 and the second rotor 2000 in sequence. The mixed gas passes through the first rotor adsorption zone 1010 and the second rotor adsorption zone 2010 of the first rotor 1000 and the second rotor 2000 in sequence for two-stage dehumidification to obtain dry low dew point gas, which is then supplied to the drying room 3000. At the same time, regeneration gas is formed upstream of the two-stage rotors to cool the cooling zones (1020, 2020) and regenerate the regeneration zones (1030, 2030) of the first and second rotors, and then is discharged to the external environment.

[0003] The scheme has a simple structure and can form low dew point air supply in the drying room. However, since the large flow of circulating gas needs to pass through two stages of rotors, the energy consumption cost of air transport and processing is high. In addition, the temperature of the regenerated gas is still high after passing through the regeneration zone of the rotor, and direct discharge will cause waste of gas heat. Summary of the Invention

[0004] Given the high energy consumption costs and significant waste of waste heat associated with the transport and processing of airflow in existing rotary adsorption dehumidifiers, the main objective of this invention is to provide a dual-rotor low dew point dehumidifier and a dehumidification system for production equipment using this dehumidifier.

[0005] To achieve the above objectives, the present invention provides, in a first aspect, a dual-rotor low dew point dehumidifier, comprising:

[0006] Fresh air inlet;

[0007] Air intake fan;

[0008] A dehumidifying fresh air exhaust port is connected to the air passage of the production unit.

[0009] Exhaust fan;

[0010] Aftercooling device;

[0011] Its characteristic is that it further includes at least:

[0012] The first adsorption rotor assembly comprises at least one first adsorption zone, at least one first regeneration zone, and a first heating and regeneration device.

[0013] The second adsorption rotor assembly includes at least a second adsorption zone, a second regeneration zone, and a second heating and regeneration device.

[0014] The first adsorption zone is connected to the second adsorption zone via gas path, so that the fresh air flowing in from the fresh air inlet passes through the first adsorption zone and the second adsorption zone in sequence, and is cooled by the post-cooling device before flowing into the production device from the dehumidified fresh air exhaust port; the second regeneration zone is connected to the first regeneration zone via gas path, so that the regeneration gas generated from the second regeneration zone corresponds to the regeneration heating source of the first regeneration zone.

[0015] A circulating air inlet duct connects the production device to the second adsorption zone of the second adsorption wheel;

[0016] A regeneration air circulation pipe is provided, which connects the outlet of the second regeneration zone to the inlet of the second heating and regeneration device.

[0017] Optionally, the second adsorption wheel device may further include at least one cooling zone.

[0018] Optionally, a portion of the fresh air after adsorption and dehumidification in the first adsorption zone passes through the cooling zone of the second adsorption rotor device and is used as a gas heating source for the second regeneration zone under the heating of the second heating regeneration device.

[0019] Optionally, a portion of the fresh air that has been adsorbed, dehumidified, and cooled by the second adsorption zone and the post-cooling device passes through the cooling zone of the second adsorption rotor device, mixes with the fresh air that has been adsorbed, dehumidified, and cooled by the first adsorption zone, and then recirculates into the second adsorption zone.

[0020] Optionally, a portion of the fresh air that has been adsorbed and dehumidified in the second adsorption zone but has not been cooled by the post-cooling device is mixed with a portion of the regenerated gas generated by heating in the second regeneration zone and used again as the gas heating source for the second heating and regeneration device.

[0021] Furthermore, it also includes a pre-cooling device located upstream of the first adsorption rotor assembly and connected to the gas path of the first adsorption zone.

[0022] Furthermore, it also includes an intermediate cooling device disposed between the first adsorption rotor assembly and the second adsorption rotor assembly, and connected to the gas path of the first adsorption zone and the second adsorption zone.

[0023] Preferably, the first adsorption rotor assembly consists only of a first adsorption zone, a first regeneration zone, and a first heating and regeneration device.

[0024] In a second aspect, the present invention provides a dehumidification system for a production apparatus, comprising a production apparatus and the aforementioned dual-rotor low dew point dehumidifier connected to the air passage of the production apparatus.

[0025] Based on the above design, the beneficial effects of this invention are as follows: First, after the fresh air passes through the first-stage adsorption, it mixes with the circulating airflow of the production unit and then undergoes a second adsorption. The circulating airflow does not need to pass through two stages of adsorption, reducing the airflow transport distance of the large-volume circulating airflow, saving energy, and only one fan is needed to transport the circulating airflow and fresh air. Second, since the circulating airflow of the production unit does not pass through the first adsorption rotor, the airflow of the first adsorption rotor assembly is small, and it can consist of only one adsorption zone and one regeneration zone, which can achieve miniaturization of the first adsorption rotor assembly and save production costs. Third, the regenerated airflow generated by the second adsorption rotor assembly of this invention can be recycled. This invention can enhance waste heat utilization and minimize energy waste. Fourth, the invention can be equipped with a three-stage cooling device (front, middle, and rear) to ensure that the temperature of the supplied dry air (SA) is below 20°C throughout the year. Finally, a portion of the low dew point dry air from the adsorption outlet of the second adsorption rotor is mixed with a portion of the air from the regeneration outlet and a portion of the outdoor air (the outdoor air may not be mixed) and then sent to the inlet of the regeneration heater of the second adsorption rotor. Since the regeneration temperature of the second adsorption rotor is reduced, it does not need to have a cooling zone, thus achieving miniaturization of the second adsorption rotor assembly, facilitating transportation, further saving production costs, and promoting market application. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structural principle of an existing rotary adsorption dehumidifier;

[0027] Figure 2 This is a schematic diagram illustrating the structural principle of the first embodiment of the dual-rotor low dew point dehumidifier of the present invention;

[0028] Figure 3 This is a schematic diagram illustrating the structural principle of the second embodiment of the dual-rotor low dew point dehumidifier of the present invention;

[0029] Figure 4 This is a schematic diagram of the structural principle of the third embodiment of the dual-rotor low dew point dehumidifier of the present invention;

[0030] Explanation of reference numerals in the attached figures

[0031] 100. First adsorption rotor assembly; 101. First adsorption zone; 103. First regeneration zone; 104. First heating and regeneration device; 200. Second adsorption rotor assembly; 201. Second adsorption zone; 202. Second cooling zone; 203. Second regeneration zone; 204. Second heating and regeneration device; 300. Inlet fan; 400. Exhaust fan; 501. Pre-cooling device; 502. Intermediate cooling device; 503. Post-cooling device; 600. Circulating air inlet duct; 700. Regeneration air circulation duct; 1000. First rotor; 1010. First rotor adsorption zone; 1020. First rotor cooling zone; 1030. First rotor regeneration zone; 2000. Second rotor; 2010. Second rotor adsorption zone; 2020. Second rotor cooling zone; 2030. Second rotor regeneration zone; 3000. Drying room. Detailed Implementation

[0032] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. However, it should be noted that these embodiments are not intended to limit the present invention, and any equivalent changes or substitutions in function, method, or structure made by those skilled in the art based on these embodiments are all within the protection scope of the present invention.

[0033] Furthermore, the descriptions of orientations in this specification, such as up, down, left, right, front, back, inside, outside, longitudinal, transverse, vertical, and horizontal, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the purpose of facilitating the description of the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0034] Furthermore, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances, and they should not be construed as limiting the invention.

[0035] For ease of description, the preferred embodiments of the present invention select a lithium battery drying room as the production device. However, it should be understood that the production device described in the present invention is not limited to a lithium battery drying room. Any production device that requires low-temperature drying and air supply during production, such as drying rooms in the paper industry, solar photovoltaic cell production process, automotive painting flash drying room, semiconductor manufacturing, pharmaceutical, and food production industries, can be used in conjunction with the dual-rotor low dew point dehumidifier of the present invention. The lithium battery drying room should not be construed as a limitation on the production device in the claims.

[0036] Figure 2 The diagram shown is a schematic representation of the structure and principle of the first embodiment of the dual-rotor low dew point dehumidifier of the present invention. The dual-rotor low dew point dehumidifier includes a fresh air inlet, a first adsorption rotor assembly 100, a second adsorption rotor assembly 200, an air intake fan 300, an exhaust fan 400, a dehumidified fresh air exhaust outlet, a pre-cooling device 501, an intermediate cooling device 502, a post-cooling device 503, and a circulating air inlet duct 600. In this embodiment, the first adsorption rotor assembly 100 consists of a first adsorption zone 101, a first regeneration zone 103, and a first heating and regeneration device 104. The second adsorption rotor assembly 200 consists of a second adsorption zone 201, a second cooling zone 202, a second regeneration zone 203, and a second heating and regeneration device 204. The pre-cooling device 501, the intermediate cooling device 502, and the post-cooling device 503 are preferably at least one of a low-temperature chilled water surface cooler, a low-temperature antifreeze liquid, or a refrigerant direct evaporator. Although this embodiment uses two sets of adsorption rotor assemblies, and each adsorption rotor assembly has one adsorption zone, it should be understood that this is only a preferred embodiment of the present invention. Those skilled in the art can set more adsorption rotor assemblies connected in series and / or set multiple adsorption zones on each adsorption rotor assembly according to the needs of fresh air dryness. In addition, although this embodiment uses a three-stage cooling device (pre-cooling, intermediate cooling, and post-cooling), it should be understood that this only represents a preferred embodiment. The pre-cooling device 501 and the intermediate cooling device 502 are not essential components for solving the technical problem of the present invention, and they should not be construed as limiting the scope of protection of the claims.

[0037] like Figure 2As shown, the first adsorption zone 101 and the second adsorption zone 201 are connected by an air path, so that the fresh air flowing in from the fresh air inlet and cooled by the pre-cooling device 501 passes sequentially through the first adsorption zone 101, the intermediate cooling device 502, and the second adsorption zone 201, and is further cooled by the post-cooling device 503 before flowing into the production device 3000 from the dehumidified fresh air exhaust port. After two-stage adsorption dehumidification and three-stage cooling, the humidity of the fresh air entering the production device can be reduced to 0.024 g / kg (-50℃ DP), and the temperature can be reduced to 15℃, which fully meets the drying requirements. In order to minimize the airflow of the first adsorption rotor assembly 100 and save energy, this embodiment also provides a circulating air inlet duct 600. The circulating air inlet duct 600 connects the production device 3000 and the second adsorption zone 201 of the second adsorption rotor assembly 200. Thus, the fresh air mixes with the circulating airflow in the circulating air inlet duct 600 after the first stage of adsorption and then passes through the second stage of adsorption. The circulating airflow does not need to undergo two stages of adsorption, reducing the airflow transport distance of the large-volume circulating airflow and saving energy. The transportation of circulating airflow and fresh air can be achieved using only one air intake fan 300. In addition, since the circulating airflow mixes with the fresh air before the second adsorption rotor assembly 200, the airflow at the second adsorption rotor assembly 200 is sufficiently guaranteed. The first adsorption rotor assembly 100 does not need an excessive airflow. Therefore, the first adsorption rotor assembly 100 does not need to be equipped with a cooling zone, but only needs to be equipped with an adsorption zone and a regeneration zone, thereby reducing its size and realizing the miniaturization of the first adsorption rotor assembly 100. Furthermore, the second regeneration zone 203 of the second adsorption rotor assembly 200 is connected to the first regeneration zone 103 of the first adsorption rotor assembly 100 via a gas path, so that the regenerated gas generated from the second regeneration zone 203 serves as the regeneration heating source for the first regeneration zone 103. This arrangement maximizes the utilization of gas waste heat and reduces the power consumption of the heating and regeneration device. To further improve the utilization of gas waste heat, this embodiment also includes a second circulating gas flow path, which connects the outlet of the second regeneration zone 203 to the inlet of the second heating and regeneration device 204 via a regeneration air circulation pipe 700. That is, a portion of the regenerated gas generated by heating and regeneration in the second regeneration zone 203 is circulated back to the second regeneration zone, mixed with a portion of fresh air that has been adsorbed and dehumidified in the first adsorption zone and heated by the second cooling zone 202, and then circulated again through the second heating and regeneration device 204 as the gas heating source for the second regeneration zone 203. This second circulating gas flow path recycles the regenerated airflow generated by the second adsorption rotor assembly 200, which enhances waste heat utilization and minimizes energy waste. However, it should be understood that the second circulating gas flow path in this embodiment may not be mixed with outside fresh air, and the second circulating gas flow path only represents a preferred embodiment and is not a necessary component for solving the technical problem of this invention, and should not be construed as limiting the scope of protection of the claims.

[0038] Figure 3 The diagram shown illustrates the structural principle of the second embodiment of the dual-rotor low dew point dehumidifier of the present invention. Compared with the first embodiment, the main difference lies in the manner in which the fresh air passes through the second cooling zone 202 of the second adsorption rotor assembly 200. In this embodiment, a third circulating gas flow path is added. Specifically, a portion of the low-temperature, low-dew-point dry air, after being adsorbed, dehumidified, and cooled by the second adsorption zone 201 and the post-cooling device 503, is sent into the second cooling zone 202 in the opposite direction to the adsorption air. This air mixes with the fresh air after being adsorbed, dehumidified, and cooled by the first adsorption zone 101 and the return air from the production device 3000, and then recirculates into the second adsorption zone 201 of the second adsorption rotor assembly 200. Compared with the first embodiment, the airflow passing through the post-cooling device 503 in this embodiment is a low-temperature, dry airflow, resulting in a better cooling effect on the second cooling zone 202.

[0039] Figure 4 The diagram shown is a schematic representation of the structural principle of the third embodiment of the dual-rotor low dew point dehumidifier of the present invention. Compared with the first and second embodiments, this embodiment uses a portion of the low dew point dry air that has been adsorbed and dehumidified by the second adsorption zone 201 of the second adsorption rotor assembly 200 and has not been cooled by the post-cooling device 503, mixed with a portion of the regenerated gas generated by heating in the second regeneration zone 202 and a portion of outdoor air, and then used as the gas heating source for the second heating regeneration device 204. In this embodiment, because the regeneration temperature of the second adsorption regeneration rotor assembly 200 is reduced, the second adsorption regeneration rotor assembly 200 does not need to be equipped with a cooling zone, thereby achieving miniaturization of the second adsorption rotor assembly, facilitating transportation, further saving production costs, and benefiting market application. However, it should be understood that in this embodiment, the second circulating gas flow path may not mix with outside fresh air. Instead, a portion of low dew point dry air that has been adsorbed and dehumidified by the second adsorption zone 201 of the second adsorption rotor assembly 200 and has not been cooled by the post-cooling device 503 is mixed with a portion of regenerated gas generated by heating in the second regeneration zone 202 as a gas heating source. The outside fresh air should not be regarded as a limitation on the scope of protection of the claims of this invention. In conjunction with specific data from the above three embodiments, outdoor fresh air flows into the pre-cooling device 501 with an initial temperature of 35°C, an air volume of 6600 m³ / h, and a humidity of 28.92 g / kg. After primary cooling by the pre-cooling device 501, the fresh air enters the first adsorption zone 101 of the first adsorption wheel assembly 100 with a temperature of 15°C, an air volume of 6600 m³ / h, and a humidity of 10.11 g / kg. After dehumidification and adsorption by the first adsorption zone 101, the humidity of the outlet air becomes 4 g / kg. After secondary cooling by the intermediate cooling device 502, the outlet air temperature will be further reduced to 15°C.

[0040] In Example 1, the low-temperature, low-dew-point gas exiting the intermediate cooling device 502 is mixed with circulating gas from the production device (temperature 20°C, airflow 7800 m³ / h, humidity 0.388 g / kg) introduced through the circulating air inlet duct 600 to form a mixed gas. One stream of this mixed gas flows into the second adsorption zone 201 at a temperature of 20.4°C, an airflow of 14400 m³ / h, and a humidity of 2.044 g / kg. After secondary dehumidification adsorption in the second adsorption zone 201 and tertiary cooling in the post-cooling device 503, it is introduced into the production device at a temperature of 15°C, an airflow of 12000 m³ / h, and a humidity of 0.024 g / kg. The other stream of the mixed gas flows into the second cooling zone 202 at a temperature of 20.4°C, an airflow of 2400 m³ / h, and a humidity of 2.044 g / kg. The heated exhaust air from the cooling zone 202 mixes with a portion of the regenerated gas (second circulating gas) from the second regeneration zone and the outside air. The mixture, at a temperature of 67.5°C, a flow rate of 3432 m³ / h, and a humidity of 6.39 g / kg, flows into the second regeneration heating device 204 for reheating to 115°C before being sent to the second regeneration zone 203 for regeneration. Meanwhile, the remaining portion of the regenerated gas from the outlet of the second regeneration zone that does not enter the circulating circulation serves as the gas heating source for the regeneration zone 103 of the first adsorption rotor assembly 100. Under the heating of the first regeneration heating device 104, it generates regenerated gas at a temperature of 115°C, a flow rate of 2400 m³ / h, and a humidity of 16.49 g / kg, which is then sent to the first regeneration zone 103. The exhaust gas from the first regeneration zone 103, with its humidity rising to 33.3 g / kg, is then discharged into the outside atmosphere.

[0041] In Example 2, the low-temperature, low-dew-point gas exiting the intermediate cooling device 502 mixes with the first circulating gas and the circulating gas in the third circulating gas path (hereinafter referred to as the third circulating gas) introduced into the production device through the circulating air inlet duct 600 to form a mixed gas. This mixed gas flows into the second adsorption zone 201 at a temperature of 25.5°C, a flow rate of 13200 m³ / h, and a humidity of 1.51 g / kg. After secondary dehumidification adsorption in the second adsorption zone 201 and tertiary cooling by the post-cooling device 503, one stream is introduced into the production device at a temperature of 15°C, a flow rate of 12000 m³ / h, and a humidity of 0.024 g / kg. Following internal drying within the production device, the temperature, flow rate, and humidity of the first circulating gas entering the circulating air inlet duct 600 change sequentially to 25°C, 7800 m³ / h, and 0.388 g / kg. Meanwhile, the third circulating gas, after being heated by the second cooling zone 202, also changes sequentially to 65°C, 1200 m³ / h, and 1.51 g / kg. m³ / h, 0.024 g / kg. A portion of the regenerated gas (second circulating gas) from the second regeneration zone is mixed with outside air and flows into the second regeneration heating device 204 at a temperature of 45℃, a flow rate of 3771 m³ / h, and a humidity of 30.3 g / kg, where it undergoes further heating and regeneration. The remaining portion of the regenerated gas from the second regeneration zone that does not enter the circulating flow serves as the gas heating source for the regeneration zone of the first adsorption rotor assembly 100. Under the heating of the first regeneration heating device 104, it generates regenerated gas at a temperature of 115℃, a flow rate of 3000 m³ / h, and a humidity of 35.48 g / kg, which enters the first regeneration zone 103, regenerates the first rotor 100, and is then discharged into the outside atmosphere.

[0042] In Example 3, the low-temperature, low-dew-point gas exiting the intermediate cooling device 502 mixes with the first circulating gas introduced into the production device through the circulating air inlet duct 600 to form a mixed gas. This mixed gas flows into the second adsorption zone 201 at a temperature of 20.6°C, a flow rate of 14000 m³ / h, and a humidity of 1.988 g / kg. After secondary dehumidification adsorption in the second adsorption zone 201, it flows into the post-cooling device 503 at a temperature of 29°C, a flow rate of 12000 m³ / h, and a humidity of 0.024 g / kg. After tertiary cooling, it is introduced into the production device at a temperature of 15°C, a flow rate of 12000 m³ / h, and a humidity of 0.024 g / kg. Following internal drying within the production device, the temperature, flow rate, and humidity of the first circulating gas entering the circulating air inlet duct 600 subsequently change to 25°C, 7800 m³ / h, and 7800 m³ / h, respectively. m³ / h, 0.388g / kg; while another stream flows directly to the second regeneration zone 203, where it mixes with the regeneration gas (second circulating gas) circulated back from the second regeneration zone and the outside air, thus flowing into the second regeneration heating device 204 at a temperature of 55℃, an air volume of 4000 m³ / h, and a humidity of 12g / kg, and undergoes regeneration again; while the other part of the regeneration gas in the second regeneration zone that does not enter the second circulating gas serves as the gas heating source for the regeneration zone of the first adsorption rotor assembly 100. Under the heating of the first regeneration heating device 104, it generates regeneration gas at a temperature of 115℃, an air volume of 3000 m³ / h, and a humidity of 18.87g / kg, which enters the first regeneration zone 103 and regenerates the first rotor 100, becoming gas at a temperature of 68℃, an air volume of 3000 m³ / h, and a humidity of 31.5g / kg, which is then discharged into the outside atmosphere.

[0043] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0044] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. A dual-rotor low dew point dehumidifier, comprising: Fresh air inlet; Air intake fan; A dehumidifying fresh air exhaust port is connected to the air passage of the production unit. Exhaust fan; Aftercooling device; Its characteristic is that it further includes at least: The first adsorption rotor assembly comprises at least one first adsorption zone, at least one first regeneration zone, and a first heating and regeneration device. The second adsorption rotor assembly includes at least a second adsorption zone, a second regeneration zone, and a second heating and regeneration device. The first adsorption zone is connected to the second adsorption zone via gas path, so that the fresh air flowing in from the fresh air inlet passes through the first adsorption zone and the second adsorption zone in sequence, and is cooled by the post-cooling device before flowing into the production device from the dehumidified fresh air exhaust port; the second regeneration zone is connected to the first regeneration zone via gas path, so that the regeneration gas generated from the second regeneration zone corresponds to the regeneration heating source of the first regeneration zone. A circulating air inlet duct connects the production device to the second adsorption zone of the second adsorption wheel; The regeneration air circulation duct connects the outlet of the second regeneration zone to the inlet of the second heating and regeneration device. The second adsorption rotor device further includes at least one cooling zone. A portion of the fresh air after being adsorbed, dehumidified, and cooled by the second adsorption zone and the post-cooling device is sent into the cooling zone of the second adsorption rotor device in the opposite direction to the adsorption air. It is then mixed with the fresh air after being adsorbed, dehumidified by the first adsorption zone and the return air from the production device, and then recirculated into the second adsorption zone.

2. The dual-rotor low dew point dehumidifier as described in claim 1, characterized in that: It also includes a pre-cooling device located upstream of the first adsorption rotor assembly and connected to the gas path of the first adsorption zone.

3. The dual-rotor low dew point dehumidifier as described in claim 1 or 2, characterized in that: It also includes an intermediate cooling device disposed between the first adsorption rotor assembly and the second adsorption rotor assembly, and connected to the gas path of the first adsorption zone and the second adsorption zone.

4. The dual-rotor low dew point dehumidifier as described in claim 1, characterized in that: The first adsorption rotor assembly consists of only a first adsorption zone, a first regeneration zone, and a first heating and regeneration device.

5. A dehumidification system for a production facility, characterized in that: The device includes a production unit and a dual-rotor low dew point dehumidifier as described in any one of claims 1-4, which is connected to the air circuit of the production unit.

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