Double-rotating-wheel type air dehumidification equipment with partial regeneration air circulation

Abstract

According to the structure of the equipment, the upstream of an air inlet duct is used for allowing fresh air to enter, and the downstream of the air inlet duct is sequentially connected with an adsorption area of a front-stage dehumidification rotating wheel, a processing fan and an adsorption area of a rear-stage dehumidification rotating wheel; an adsorption area outlet of the rear-stage dehumidification rotating wheel, a drying space of the production workshop and an inlet of the processing fan are connected through pipelines; the upstream of the regeneration air duct is connected with an outlet of the processing fan, the downstream of the regeneration air duct is sequentially connected with a cold blowing area of the rear-stage dehumidification rotating wheel, the first-stage heater and a regeneration area of the rear-stage dehumidification rotating wheel, an outlet of the regeneration area of the rear-stage dehumidification rotating wheel is divided into two paths, one path is sequentially connected with the second-stage heater, a regeneration area of the front-stage dehumidification rotating wheel and the regeneration fan through pipelines, and the other path is connected with the second-stage heater. And the other path is sequentially connected with the circulating fan and the inlet of the primary heater through pipelines. By means of the mode that part of regeneration air of the rear-stage dehumidification rotating wheel is circularly heated and regenerated, the newly-added fresh air amount needed by regeneration is greatly reduced, and energy consumption is greatly reduced.

Description

Technical Field

[0001] This application relates to the field of air dehumidification technology, and in particular to a dual-rotor air dehumidification device and process with partial regenerated air circulation, which is mainly used for dehumidifying atmospheric pressure air to produce low humidity air. Background Technology

[0002] Low humidity is a necessary condition for many industrial production processes, such as lithium-ion battery production, pharmaceutical manufacturing, and the production of biochemical products and testing instruments.

[0003] Taking the lithium-ion battery production process as an example, the dehumidification system is the core equipment to ensure the dew point of the environment during the lithium battery production process. However, its energy consumption is high, accounting for too high a proportion of the total energy consumption of lithium battery production. Moreover, the humidity requirements of the factory are directly proportional to the energy consumption of the dehumidification system. In the lithium battery processing process, humidity control is a very important link. Among the current dehumidification equipment, there are various dehumidification methods, but few have made good technological improvements in energy saving. Utility Model Content

[0004] In view of the above-mentioned technical problems existing in the prior art, the purpose of this application is to provide a dual-rotor air dehumidification device and process with partial regenerated air circulation.

[0005] The technical solution adopted in this application is as follows:

[0006] Partial regenerated air circulation dual-rotor air dehumidifiers include:

[0007] The pre-stage dehumidification impeller and the post-stage dehumidification impeller are arranged in sequence. The pre-stage dehumidification impeller includes an adsorption zone and a regeneration zone, and the post-stage dehumidification impeller includes an adsorption zone, a cold blowing zone, and a regeneration zone.

[0008] An air intake duct is provided upstream for the intake of fresh air, and downstream of the air intake duct is sequentially connected to the adsorption zone of the pre-stage dehumidification impeller, the processing fan, and the adsorption zone of the post-stage dehumidification impeller; the outlet of the adsorption zone of the post-stage dehumidification impeller, the drying space of the production workshop, and the inlet of the processing fan are sequentially connected by pipelines.

[0009] The regeneration air duct is connected upstream to the outlet of the processing fan to introduce a stream of cold air. Downstream, the regeneration air duct is sequentially connected to the cold air zone of the subsequent dehumidification rotor, the primary heater, and the regeneration zone of the subsequent dehumidification rotor. The outlet of the regeneration zone of the subsequent dehumidification rotor is divided into two paths. One path is connected to the secondary heater, the regeneration zone of the preceding dehumidification rotor, and the regeneration fan in sequence by a pipeline, and the outlet of the regeneration fan exhausts air to the atmosphere. The other path is connected to the circulating fan and the inlet of the primary heater in sequence by a pipeline, forming a regeneration air circulation loop.

[0010] Furthermore, a fresh air filter and a front surface cooler are installed on the air intake duct at the adsorption zone inlet of the pre-stage dehumidification impeller.

[0011] Furthermore, a medium surface cooler is installed on the air intake duct between the outlet of the processing fan and the inlet of the adsorption zone of the subsequent dehumidification rotor, and the upstream of the regeneration duct is connected to the outlet of the medium surface cooler.

[0012] Furthermore, a post-cooler, a medium-efficiency filter, and a first humidity control meter are installed on the adsorption zone outlet pipe of the post-stage dehumidification impeller. The first humidity control meter is interlocked with the signal of the first-stage heater.

[0013] Furthermore, a second humidity control meter is installed on the air intake duct between the adsorption zone outlet of the pre-stage dehumidification impeller and the inlet of the treatment fan, and the second humidity control meter is interlocked with the signal of the secondary heater.

[0014] Furthermore, a regulating valve is installed on the pipeline between the outlet of the circulating fan and the inlet of the primary heater.

[0015] Compared with the prior art, the beneficial effects achieved by this application are:

[0016] 1) After the drying air is used in the production workshop, the humidity of the outlet air is usually significantly lower than that of the fresh air. This application reuses the drying outlet air from the production workshop, which can effectively save energy consumption for dehumidification by the downstream dehumidification rotor. In addition, the outlet air from the adsorption zone of the upstream dehumidification rotor is mixed with the reused air from the production workshop, and a portion is used to dehumidify the downstream dehumidification rotor and regenerate the upstream dehumidification rotor, resulting in relatively low regeneration energy consumption.

[0017] 2) The dual-rotor air dehumidifier with partial regeneration air circulation in this application further adopts a process of partial regeneration air circulation and heating regeneration in the rear dehumidifier rotor, which greatly reduces the amount of new fresh air required for regeneration. The regeneration air volume required by the rear dehumidifier rotor is less than 1 / 10 of the required low-humidity air volume. That is, the amount of new fresh air used for regeneration is less than 1 / 10 of the low-humidity air volume required by the production workshop. Moreover, the inlet air temperature of the rear dehumidifier rotor can be as high as 30°C or more, and the dew point of the low-humidity air sent into the production workshop can be as low as -70°C or less. Therefore, the energy consumption of cooling and heating regeneration is greatly reduced. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the dual-rotor air dehumidifier in Example 1.

[0019] Figure 2 This is a schematic diagram of the structure of the dual-rotor air dehumidifier with partial regenerated air circulation in this application. Detailed Implementation

[0020] The present application will be further described below with reference to specific embodiments, but the scope of protection of the present application is not limited thereto.

[0021] Example: Comparison Figure 2

[0022] A dual-rotor air dehumidifier with partial regeneration air circulation includes: a pre-stage dehumidifier 3 and a post-stage dehumidifier 6 arranged sequentially. The pre-stage dehumidifier 3 includes an adsorption zone and a regeneration zone, and the post-stage dehumidifier 6 includes an adsorption zone, a cold blowing zone, and a regeneration zone.

[0023] The air intake duct is used for the intake of fresh air. The downstream of the air intake duct is connected in sequence to the adsorption zone of the pre-stage dehumidification impeller 3, the processing fan 4, and the adsorption zone of the post-stage dehumidification impeller 6. The outlet of the adsorption zone of the post-stage dehumidification impeller 6, the drying space of the production workshop, and the inlet of the processing fan 4 are connected in sequence by pipelines.

[0024] The regeneration air duct is connected upstream to the outlet of the processing fan 4 to introduce a stream of cold air. Downstream, the regeneration air duct is sequentially connected to the cold air zone of the downstream dehumidifier 6, the primary heater 9, and the regeneration zone of the downstream dehumidifier 6. The outlet of the regeneration zone of the downstream dehumidifier 6 is divided into two paths. One path is connected to the secondary heater 10, the regeneration zone of the upstream dehumidifier 3, and the regeneration fan 11 in sequence by pipelines. The outlet of the regeneration fan 11 exhausts air to the atmosphere. The other path is connected to the circulating fan 17 and the inlet of the primary heater 9 in sequence by pipelines to form a regeneration air circulation loop.

[0025] A fresh air filter 1 and a pre-cooler 2 are installed on the air intake duct of the adsorption zone of the pre-dehumidification impeller 3.

[0026] A medium surface cooler 5 is installed on the air inlet duct between the outlet of the processing fan 4 and the inlet of the adsorption zone of the subsequent dehumidification rotor 6. The upstream of the regeneration air duct is connected to the outlet of the medium surface cooler 5. The cooling temperature of the medium surface cooler 5 is regulated by the medium surface cooler outlet air temperature control instrument 14.

[0027] A post-cooler 7, a medium-efficiency filter 8, and a first humidity control meter 16 are installed on the outlet pipe of the adsorption zone of the post-dehumidification impeller 6. The cooling temperature of the post-cooler 7 is regulated by the post-cooler outlet air temperature control instrument 15. The first humidity control meter 16 is signal-interlocked with the first-stage heater 9. The heating temperature of the first-stage heater 9 on the regeneration air is regulated according to the humidity of the exhaust air at the outlet of the adsorption zone of the post-dehumidification impeller 6. When the humidity of the air entering the production workshop is high, the heating temperature of the first-stage heater 9 is increased accordingly, and vice versa.

[0028] A second humidity control meter 13 is installed on the air intake duct between the adsorption zone outlet of the pre-stage dehumidification rotor 3 and the inlet of the treatment fan 4. The second humidity control meter 13 is signal-interlocked with the secondary heater 10.

[0029] A regulating damper 18 is installed on the pipeline between the outlet of the circulating fan 17 and the inlet of the primary heater 9.

[0030] The process of the dual-rotor air dehumidifier with partial regenerated air circulation in this application includes the following steps:

[0031] S1: Fresh air from the atmosphere is filtered and cooled to below 20°C and below 8.5g / kg. It then enters the adsorption zone of the pre-dehumidification rotor 3 for dehumidification treatment, so that the humidity of the dehumidified gas reaches 0.8-1.8g / kg and the temperature reaches 35-46°C. It is then mixed with the exhaust air from the low-humidity dry space of the production workshop. The humidity of the mixed air is 0.3-0.8g / kg and the temperature is 25-32°C.

[0032] S2: The mixed air from step S1 is transported by the processing fan 4 and cooled to 12-30℃ before being divided into two paths. The air volume of the first path is less than 1 / 10 of the total air volume. The first path of air is blown into the cold blowing zone of the downstream dehumidification rotor 6 to cool the downstream dehumidification rotor 6. The second path of air is blown into the adsorption zone of the downstream dehumidification rotor 6 for further dehumidification. After dehumidification, the air is sent into the low-humidity drying space of the production workshop and then returns to mix with the exhaust air from the adsorption zone of the upstream dehumidification rotor 3.

[0033] S3: The air outlet from the cold blowing zone of the dehumidifying impeller 6 after step S2 is mixed with the regenerated air from the circulating fan 17. After being heated to 100-135℃ by the primary heater 9, it is blown into the regeneration zone of the dehumidifying impeller 6. Then it is divided into two paths. The air volume of the first path of regeneration air is 1 / 5-4 / 5 of the total air volume. The first path of regeneration air is drawn in and pressurized by the circulating fan 17 and then returned to the inlet of the primary heater 9. The second path of regeneration air is heated to 100-135℃ again by the secondary heater 10 and then enters the regeneration zone of the pre-dehumidifying impeller 3, and then is discharged.

[0034] In step S1, the outlet air temperature of the low-humidity drying space in the production workshop is 20-25℃, and the humidity is below 0.0775g / kg (i.e., below the dew point of -40℃).

[0035] In step S2, the humidity of the dehumidified air at the outlet of the adsorption zone of the subsequent dehumidification rotor 6 is below 0.0063 g / kg.

[0036] In step S3, the outlet air temperature of the regeneration zone of the downstream dehumidifier rotor 6 is 60-75℃ and the outlet air humidity is 5-9g / kg; the outlet air temperature of the regeneration zone of the upstream dehumidifier rotor 3 is 60-80℃ and the outlet air humidity is above 15g / kg, preferably 15-23g / kg.

[0037] like Figure 2 As shown, taking the hot and humid summer as an example, the temperature and humidity of the air in summer can reach 35℃ and 25g / kg, respectively. The fresh air from the atmosphere is cooled to 12-15℃ after passing through the fresh air filter 1 and the front surface cooler 2. After being dehumidified by the front dehumidification wheel 3, the humidity reaches 0.8-1.8g / kg and the temperature reaches 35-45℃. The mixed air after mixing with the return air in the workshop has a humidity of 0.3-0.8g / kg and a temperature of 25-30℃. The mixed air is transported by the handling fan 4 and cooled to 12-30℃ by the middle surface cooler 5 before entering the rear dehumidification wheel 6. The outlet air humidity after being dehumidified by the rear dehumidification wheel 6 can reach below 0.0015g / kg (i.e., the dew point can reach below -70℃). The temperature of the low-humidity air sent to the workshop can be adjusted by the rear surface cooler 7.

[0038] Part of the mixed air cooled by the intermediate surface cooler 5 is used as cold blowing inlet air (less than 1 / 10 of the low humidity air volume) and enters the cold blowing zone of the subsequent dehumidifying impeller 6 after passing through the regeneration zone to cool the subsequent dehumidifying impeller 6. Part of the regeneration outlet air of the subsequent dehumidifying impeller is used as the regeneration circulation air of the subsequent dehumidifying impeller (1 / 5-4 / 5 of the regeneration outlet air volume of the subsequent dehumidifying impeller, temperature is usually 70-100℃). After being pressurized by the regeneration circulation fan 17, it is mixed with the cold blowing outlet air with a higher temperature (usually 60-90℃), and then heated by the regeneration heater 9 of the subsequent dehumidifying impeller (temperature is usually 100-135℃) and used as the regeneration inlet air of the subsequent dehumidifying impeller to regenerate the subsequent dehumidifying impeller 6. Another portion of the exhaust air from the regenerated dehumidifier rotor (1 / 5 to 4 / 5 of the exhaust air volume from the regenerated dehumidifier rotor, usually at a temperature of 70-100℃) is heated by the regenerated heater 10 of the pre-dehumidifier rotor (usually at a temperature of 100-135℃) and then goes to regenerate the pre-dehumidifier rotor 3. The exhaust air from the regenerated dehumidifier rotor is then discharged into the atmosphere via the regeneration fan 11.

[0039] The key feature of this application is the adoption of a regeneration and circulation air method using a post-stage dehumidifier rotor, with the addition of a regeneration circulation fan 17. This allows for more thorough regeneration of the post-stage dehumidifier rotor 6, while the amount of fresh air discharged from the pre-stage dehumidifier rotor for regeneration is less than 1 / 10 of the low-humidity air volume required in the production workshop. This significantly reduces the energy consumption for fresh air cooling and dehumidification. Simultaneously, the reduction in the inlet / outlet air volume of the pre-stage dehumidifier rotor avoids excessive regeneration air volume and energy waste due to excessively high outlet air temperature. Because the post-stage dehumidifier rotor 6 can be regenerated more thoroughly, even at higher temperatures (up to 30°C), it can produce low-humidity air with a dew point below -70°C. Example 1

[0040] Taking a "partially regenerated air circulation dual-rotor air dehumidifier" installed at a company in Chengdu on March 12, 2025 as an example, it adopts the following... Figure 2 The equipment described above performs dehumidification and drying. The low-humidity airflow rate of the equipment is 11000 m³ / h. 3 / h (that is, the air volume output from the dehumidification rotor treatment area, which is also the drying air volume supplied to the workshop is 11000m³) 3 / h), the fresh air volume used for regeneration of the downstream dehumidifier rotor 6 and the upstream dehumidifier rotor 3 is 1100 m³ / h. 3 The fresh air temperature from the atmosphere is 18.7℃ and the humidity is 7.4g / h. Since the equipment does not use chilled water, the fresh air remains unchanged after passing through the pre-cooler 2. After dehumidification by the pre-dehumidification rotor 3, the air temperature is 46℃ and the humidity is 1.0g / kg. After mixing with the return air from the low-humidity dry space of the production workshop and passing through the treatment fan 4 and the intermediate cooler 5, the air temperature is 32℃ and the humidity is 0.36g / kg. The outlet air volume of the treatment fan 4 and the intermediate cooler 5 is 12100 m³ / h. 3 / h, of which the air volume entering the cooling zone of the subsequent dehumidification rotor 6 is 1100 m³ / h. 3 / h, the air volume entering the adsorption zone of the sixth stage dehumidifier is 11000m³ / h. 3 / h. After dehumidification by the adsorption zone of the subsequent dehumidification rotor 6, the low moisture dew point reaches -72℃, that is, the humidity reaches 0.0011g / kg, and the temperature is 33℃.

[0041] The regeneration air volume of the post-dehumidification rotor is 600m³. 3 / h, meaning the regenerated air return air volume from the circulating fan 17 is 600m³ / h. 3 / h, it mixes with the cold air output from the subsequent dehumidifying impeller 6, and the mixed air volume is 1700 m³ / h. 3 / h, humidity is approximately 4.2g / kg.

[0042] During this process, the average regeneration inlet air temperature of the downstream and upstream dehumidification rotors is 125℃. The regeneration outlet air temperature of the downstream dehumidification rotor 6 is 75℃, and the outlet air humidity is 8.7g / kg. The regeneration outlet air temperature of the upstream dehumidification rotor is 74℃, and the outlet air humidity is 23g / kg. Therefore, under the condition that no cooling energy is consumed, the energy consumption of the downstream dehumidification rotor regeneration heater 9 is 27.2kW, the energy consumption of the upstream dehumidification rotor regeneration heater 10 is 18.3kW, and the total regeneration energy consumption is 45.5kW.

[0043] Compare with Example 1:

[0044] Adopting such Figure 1The device described above performs dehumidification and drying. The difference between the drying device in Comparative Example 1 and the drying device in Example 1 is that Comparative Example 1 does not have a circulating fan 17, and the air outlet of the regeneration zone of its downstream dehumidification rotor 6 is not recycled.

[0045] In comparison to Example 1, the device used for dehumidifying atmospheric air to low humidity in industrial production is a dual-rotor air dehumidifier, the structural diagram of which is shown below. Figure 1 The pre-stage dehumidifier rotor 3 is divided into a treatment zone and a regeneration zone. During operation, the pre-stage dehumidifier rotor 3 rotates at a certain speed, thus continuously cycling from the adsorption zone to the regeneration zone and back to the adsorption zone. The post-stage dehumidifier rotor 6 also operates at a certain speed. The post-stage dehumidifier rotor 6 is divided into an adsorption zone, a regeneration zone, and a cold blowing zone, continuously cycling from the adsorption zone to the regeneration zone to the cold blowing zone and back to the adsorption zone. Humid air is dehumidified to a lower humidity level by passing through the adsorption zone of the pre-stage dehumidifier rotor 3, and then further dehumidified to an even lower humidity level by passing through the adsorption zone of the post-stage dehumidifier rotor 6. The regeneration of the pre-stage dehumidifier rotor 3 and the post-stage dehumidifier rotor 6 is achieved by heating the regeneration air with the post-stage dehumidifier rotor regeneration heater 9 and the pre-stage dehumidifier rotor regeneration heater 10. In this process, a large volume of fresh air is required for regeneration, resulting in high energy consumption for cooling and heating regeneration. Simultaneously, the large volume of fresh air increases the humidity of the air entering the subsequent dehumidifying rotor, thus increasing the humidity of the air exiting the rotor. Typically, to achieve low-humidity air with a dew point below -60℃, the regeneration air volume required by the subsequent dehumidifying rotor 6 is approximately 1 / 6 of the low-humidity air volume required in the production workshop. That is, due to regeneration, the increased fresh air volume is approximately 1 / 6 of the low-humidity air volume, and the inlet air temperature of the subsequent dehumidifying rotor 6 is required to be below 12℃. Generally, this regeneration air volume is excessive for the preceding dehumidifying rotor 3.

[0046] Compared with Example 1, the following method is used: Figure 1 When the aforementioned "dual-rotor air dehumidifier" is performing dehumidification and drying, the low-humidity air volume of the equipment is 11,000 m³ / h. 3 / h (that is, the air volume output from the dehumidification rotor treatment area, which is also the drying air volume supplied to the workshop is 11000m³) 3 To achieve the goal of a low dew point of -70℃ after dehumidification in the adsorption zone of the subsequent dehumidification rotor ( / h), the following technical conditions must be met:

[0047] 1) The temperature of the fresh air from the atmosphere is 18.7℃, the humidity is 7.4 g / h, and the fresh air volume for regeneration is at least 1700 m³ / h. 3 / h, the pre-cooler 2 needs to cool the incoming air to 12°C before the pre-dehumidification rotor 3 can dehumidify the incoming air to a humidity of 1.0g / kg, at which point the air temperature is 43°C.

[0048] 2) The air dehumidified by the pre-dehumidification rotor 3 is mixed with the return air from the low-humidity dry space of the production workshop. After passing through the treatment fan 4, the temperature is 25℃ and the humidity is 0.47g / kg. The outlet air volume of the treatment fan 4 is 12700 m³ / h. 3 / h, of which the air volume entering the cooling zone of the 6th stage dehumidifier rotor is 1700 m³ / h. 3 / h. At this time, the intermediate surface cooler 5 needs to cool the air intake of the downstream dehumidifier to 12°C so that the dew point of the low-humidity air after dehumidification by the downstream dehumidifier 6 can reach below -70°C. At this time, the outlet temperature of the low-humidity air after dehumidification by the adsorption zone of the downstream dehumidifier 6 is 17°C.

[0049] 3) During this process, the average regeneration inlet air temperature of the downstream dehumidifier rotor and the upstream dehumidifier rotor is 125℃, the cold air outlet temperature of the downstream dehumidifier rotor 6 is 60℃, the regeneration outlet air temperature of the downstream dehumidifier rotor 6 is 68℃, and the regeneration outlet air temperature of the upstream dehumidifier rotor 3 is 81℃. Therefore, the energy consumption of the downstream dehumidifier rotor regeneration heater 9 is 36.8kW, the energy consumption of the upstream dehumidifier rotor regeneration heater 10 is 32.3kW, the total regeneration energy consumption is 69.1kW, the cooling capacity consumption of the upstream surface cooler 2 is 3.3kW, the cooling capacity consumption of the intermediate surface cooler 5 is 42.3kW, and the total cooling capacity consumption is 45.6kW.

[0050] Compared with the "dual-rotor air dehumidifier" in Comparative Example 1, the "partially regenerated air circulation dual-rotor air dehumidifier" of Example 1 of this application reduces the total regeneration energy consumption from 69.1 kW to 45.6 kW, a reduction of 34%. Furthermore, it eliminates the need for refrigeration equipment to provide chilled water for much of the year, which is particularly significant for some special industrial applications. Even in applications requiring control of lower workshop temperatures, it can significantly reduce cooling energy consumption.

[0051] Embodiment 1 of this application, "Partial Regenerative Air Circulation Dual-Rotator Air Dehumidifier," only adds a regenerative circulation fan 17, a regulating valve 18, and air ducts, etc., resulting in relatively low investment and energy consumption for the new project. Since the regenerative circulation air volume is not sensitive to the output air humidity after reaching a certain amount, adjusting the regenerative circulation air volume by regulating the air valve is very simple.

[0052] The contents described in this specification are merely an enumeration of the implementation forms of the application concept, and the scope of protection of this application should not be regarded as limited to the specific forms described in the embodiments.

Claims

1. A dual-rotor air dehumidifier with partial regenerated air circulation, characterized in that, include: The pre-stage dehumidification impeller (3) and the post-stage dehumidification impeller (6) are arranged in sequence. The pre-stage dehumidification impeller (3) includes an adsorption zone and a regeneration zone, and the post-stage dehumidification impeller (6) includes an adsorption zone, a cold blowing zone and a regeneration zone. The air intake duct is used for the intake of fresh air. The downstream of the air intake duct is connected in sequence to the adsorption zone of the front dehumidification impeller (3), the processing fan (4), and the adsorption zone of the rear dehumidification impeller (6). The outlet of the adsorption zone of the rear dehumidification impeller (6), the drying space of the production workshop, and the inlet of the processing fan (4) are connected in sequence by pipelines. The regeneration air duct is connected upstream to the outlet of the processing fan (4) to introduce a cold blowing air. Downstream of the regeneration air duct is connected in sequence to the cold blowing zone of the downstream dehumidification impeller (6), the primary heater (9), and the regeneration zone of the downstream dehumidification impeller (6). The outlet of the regeneration zone of the downstream dehumidification impeller (6) is divided into two paths. One path is connected in sequence to the secondary heater (10), the regeneration zone of the upstream dehumidification impeller (3), and the regeneration fan (11) via pipelines. The outlet of the regeneration fan (11) exhausts air to the atmosphere. The other path is connected in sequence to the circulating fan (17) and the inlet of the primary heater (9) via pipelines to form a regeneration air circulation loop.

2. The dual-rotor air dehumidifier with partial regenerated air circulation as described in claim 1, characterized in that, The air intake duct of the adsorption zone of the pre-stage dehumidification impeller (3) is equipped with a fresh air filter (1) and a pre-cooler (2).

3. The dual-rotor air dehumidifier with partial regenerated air circulation as described in claim 1, characterized in that, A medium surface cooler (5) is installed on the air intake duct between the outlet of the processing fan (4) and the inlet of the adsorption zone of the downstream dehumidification impeller (6), and the upstream of the regeneration duct is connected to the outlet of the medium surface cooler (5).

4. The dual-rotor air dehumidifier with partial regenerated air circulation as described in claim 1, characterized in that, The adsorption zone outlet pipe of the post-stage dehumidification impeller (6) is equipped with a post-cooler (7), a medium-efficiency filter (8) and a first humidity control meter (16), and the first humidity control meter (16) is signal-interlocked with the first-stage heater (9).

5. The dual-rotor air dehumidifier with partial regenerated air circulation as described in claim 1, characterized in that, A second humidity control meter (13) is installed on the air intake duct between the adsorption zone outlet of the pre-stage dehumidification impeller (3) and the inlet of the treatment fan (4). The second humidity control meter (13) is signal-interlocked with the secondary heater (10).

6. The dual-rotor air dehumidifier with partial regenerated air circulation as described in claim 1, characterized in that, A regulating valve (18) is installed on the pipeline between the outlet of the circulating fan (17) and the inlet of the primary heater (9).

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