Single-stage rotating wheel low-dew-point air dehumidification equipment and process for partial regeneration air circulation

Abstract

The invention discloses partial regeneration air circulation single-stage rotating wheel low-dew-point air dehumidification equipment and process, the equipment comprises a dehumidification rotating wheel, a front surface air cooler and a processing fan, and the dehumidification rotating wheel comprises an adsorption area, a cold blowing area and a regeneration area; after being cooled by the front surface air cooler, fresh air of the atmosphere is divided into two paths to be discharged through the processing fan, the first path passes through an adsorption area of the dehumidification rotating wheel and an air channel of a production workshop and then returns to an inlet of the processing fan, and a drying air circulation loop is formed; the second path enters a regeneration area of the dehumidification rotating wheel through a cold blowing area of the dehumidification rotating wheel and a regeneration heater, an outlet of the regeneration area of the dehumidification rotating wheel is divided into two paths, one path is exhausted to the atmosphere, the other path is sucked back to an inlet of the regeneration heater through a regeneration air circulating fan, and a regeneration air circulating loop is formed. The equipment cost and the energy consumption of heating regeneration are reduced, the single-stage dehumidification rotating wheel is adopted, the regeneration air circulating fan is additionally arranged, the technology that part of regeneration air is circularly heated and regenerated is carried out, and the dew point of dehumidified low-humidity air can reach-55 DEG C or below.

Description

Technical Field

[0001] The present invention relates to the technical field of air dehumidification, and particularly to a single-stage rotary wheel low dew point air dehumidification device and process adopting partial regeneration air circulation, which are mainly used for dehumidifying atmospheric air to generate low-humidity air. Background Art

[0002] A low-humidity air environment is a necessary condition in many industrial production processes, such as the production process of lithium-ion batteries, the pharmaceutical industrial process, the production process of biochemical products and testing instruments, etc.

[0003] Taking the production process of lithium-ion batteries as an example, the dehumidification system is the core equipment to ensure the environmental dew point during the production of lithium batteries, but its energy consumption during use is relatively high, accounting for too high a proportion in the total energy consumption of lithium battery production, and the humidity requirement of the workshop is proportional to the energy consumption of the dehumidification system. During the processing of lithium batteries, the control of humidity is a relatively important link. Among the current dehumidification devices, there are various dehumidification methods, but little good technical improvement has been made in terms of energy conservation.

[0004] In the prior art, in order to improve the dehumidification effect, a method of combining two-stage dehumidification rotary wheels is often adopted, however, this results in a relatively high equipment investment cost. Summary of the Invention

[0005] Aiming at the above technical problems existing in the prior art, the purpose of the present application is to provide a single-stage rotary wheel low dew point air dehumidification device and process with partial regeneration air circulation.

[0006] The technical solution adopted by the present invention is as follows: A single-stage rotary wheel low dew point air dehumidification device with partial regeneration air circulation, comprising a dehumidification rotary wheel, a front surface cooler and a processing fan. The processing fan includes two inlets. The dehumidification rotary wheel includes an adsorption zone, a cold blow zone and a regeneration zone; An intake air duct, the upstream of the intake air duct is for the entry of fresh atmospheric air, the downstream of the intake air duct is sequentially connected to the front surface cooler and the first inlet of the processing fan. The outlet of the processing fan is connected to the inlet of the adsorption zone of the dehumidification rotary wheel by a pipeline. The outlet of the adsorption zone of the dehumidification rotary wheel is connected to the second inlet of the processing fan by a pipeline through the air use channel of the production workshop, forming a dry air circulation loop; A regeneration air duct, the upstream of the regeneration air duct is connected to the outlet of the processing fan, and is used to introduce a cold blow. The downstream of the regeneration air duct is sequentially connected to the cold blow zone of the dehumidification rotary wheel, a regeneration heater and the regeneration zone of the dehumidification rotary wheel. The outlet of the regeneration zone of the dehumidification rotary wheel is divided into two paths, one path is discharged to the atmosphere, and the other path is sequentially connected to the regeneration air circulation fan and the inlet of the regeneration heater by a pipeline, forming a regeneration air circulation loop.

[0007] Further, a fresh air filter is provided on the intake air duct at the front end of the front surface cooler, and a front surface cooler outlet air temperature control instrument is provided on the intake air duct at the rear end of the front surface cooler. The front surface cooler outlet air temperature control instrument is signal-interlocked with the front surface cooler.

[0008] Further, an intermediate surface cooler and an intermediate surface cooler outlet air temperature control instrument are provided on the intake air duct between the outlet of the processing fan and the inlet of the adsorption zone of the dehumidification wheel. The upstream of the regeneration air duct is connected to the outlet of the intermediate surface cooler, and the intermediate surface cooler outlet air temperature control instrument is signal-interlocked with the intermediate surface cooler.

[0009] Further, a rear surface cooler, a medium efficiency filter and a rear surface cooler outlet air temperature control instrument are provided on the pipeline at the outlet of the adsorption zone of the dehumidification wheel. The rear surface cooler outlet air temperature control instrument is signal-interlocked with the rear surface cooler.

[0010] Further, a humidity control instrument is also provided on the pipeline at the outlet of the adsorption zone of the dehumidification wheel, and the humidity control instrument is signal-interlocked with the regeneration heater.

[0011] Further, a regulating air valve is provided on the outlet pipeline of the regeneration air circulation fan.

[0012] The process of a single-stage wheel low dew point air dehumidification device with partial regeneration air circulation includes the following steps: S1: The fresh air from the atmosphere is filtered and cooled to below 12°C, and mixed with the air discharged from the low-humidity air passage in the production workshop. The humidity of the mixed air is below 2.0 g / kg and the temperature is below 25°C. The mixed air is conveyed by the processing fan and cooled to below 12°C by the intermediate surface cooler. S2: The air discharged from the intermediate surface cooler is divided into two paths. The air volume of the first path is below 1 / 6 of the total air volume. The first path of air is blown into the cold blow zone of the dehumidification wheel to cool the dehumidification wheel. The second path of air is blown into the adsorption zone of the dehumidification wheel for further dehumidification. After the dehumidified air is sent to the low-humidity air passage in the production workshop, it returns to be mixed with the cooled fresh air from the atmosphere again. S3: The air discharged from the cold blow zone of the dehumidification wheel in step S2 is mixed with the regeneration air from the regeneration air circulation fan, heated to 100 - 135°C by the regeneration heater and then blown into the regeneration zone of the dehumidification wheel. 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 regeneration air volume. The first path of regeneration air is sucked in and pressurized by the regeneration air circulation fan and then returns to the inlet of the regeneration heater again. The second path of regeneration air is exhausted.

[0013] Further, in step S2, the humidity of the dehumidified air discharged from the adsorption zone of the dehumidification wheel is below 0.0124 g / kg.

[0014] Further, in step S3, the outlet air temperature of the cold blow zone of the dehumidification rotor is 60 - 90 °C, and the outlet air temperature of the regeneration zone of the dehumidification rotor is 60 - 90 °C; the air volume of the first path of regeneration air is 45 - 55% of the total regeneration air volume.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: 1) After the air used for drying in the production workshop, the humidity of the outlet air is usually significantly lower than that of the fresh atmosphere. The present application recycles the drying outlet air of the production workshop, which can well save the energy consumption of the subsequent dehumidification rotor for dehumidification. The single-stage rotor low dew point air dehumidification device with partial regeneration air circulation of the present invention adopts a single-stage dehumidification rotor, adds a regeneration air circulation fan, and performs a process of partial regeneration air circulation heating and regeneration. The dew point of the dehumidified low humidity air can reach below -55 °C. At the same time, the pre-stage dehumidification rotor and the regeneration heating system of the pre-stage dehumidification rotor are eliminated. Therefore, not only the equipment cost is reduced, but also the energy consumption of heating and regeneration is reduced.

[0016] 2) In the process of the present invention, the conditions such as the temperature and the circulating air volume at each stage of the air are regulated, which greatly reduces the newly added fresh air volume required for regeneration. The regeneration air volume required by the dehumidification rotor is less than 1 / 6 of the required low humidity air volume, that is, the newly added fresh air volume used for regeneration is less than 1 / 6 of the required low humidity air volume of the production workshop. On the basis of achieving a good dehumidification effect, the regeneration energy consumption is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the single-stage rotor low dew point air dehumidification device with partial regeneration air circulation of the present invention.

[0018] Figure 2 It is a schematic structural diagram of the single-stage rotor low dew point air dehumidification device of the prior art. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The present invention will be further described below in conjunction with specific embodiments, but the protection scope of the present invention is not limited thereto.

[0020] Embodiment: Control Figure 1 The single-stage rotor low dew point air dehumidification device with partial regeneration air circulation includes a dehumidification rotor 5, a fresh air filter 1, a pre-cooling coil 2, a processing fan 3 and a middle cooling coil 4. The processing fan 3 includes two inlets. The dehumidification rotor 5 includes an adsorption zone, a cold blow zone and a regeneration zone.

[0021] An intake air duct, the upstream of the intake air duct is for fresh outdoor air to enter, the downstream of the intake air duct is sequentially connected to a fresh air filter 1, a front surface cooler 2, and the first inlet of a processing fan 3. The outlet of the processing fan 3 is connected to the inlet of the adsorption zone of a dehumidifying wheel 5 through an intermediate surface cooler 4 by a pipeline. The outlet of the adsorption zone of the dehumidifying wheel 5 is connected to the second inlet of the processing fan 3 through the air supply duct for the production workshop by a pipeline, forming a dry air supply circulation loop.

[0022] A regeneration air duct, the upstream of the regeneration air duct is connected to the outlet pipeline of the intermediate surface cooler 4 for introducing a stream of cold blowing air. The downstream of the regeneration air duct is sequentially connected to the cold blowing zone of the dehumidifying wheel 5, a regeneration heater 8, and the regeneration zone of the dehumidifying wheel 5. The outlet of the regeneration zone of the dehumidifying wheel 5 is divided into two paths, one path is discharged to the atmosphere, and the other path is sequentially connected to a regeneration air circulation fan 13 and the inlet of the regeneration heater 8 by a pipeline, forming a regeneration air circulation loop.

[0023] An intake air duct temperature control instrument 9 is provided on the intake air duct at the rear end of the front surface cooler 2. The intake air duct temperature control instrument 9 is signal-interlocked with the front surface cooler 2. The cooling temperature of the front surface cooler 2 is regulated by the intake air duct temperature control instrument 9.

[0024] An intermediate surface cooler outlet temperature control instrument 10 is provided on the outlet pipeline of the intermediate surface cooler 4. The intermediate surface cooler outlet temperature control instrument 10 is signal-interlocked with the intermediate surface cooler 4. The cooling temperature of the intermediate surface cooler 4 is regulated by the intermediate surface cooler outlet temperature control instrument 10.

[0025] A rear surface cooler 6, a medium efficiency filter 7, and a rear surface cooler outlet temperature control instrument 11 are provided on the outlet pipeline of the adsorption zone of the dehumidifying wheel 5. The rear surface cooler outlet temperature control instrument 11 is signal-interlocked with the rear surface cooler 6. The cooling temperature of the rear surface cooler 6 is regulated by the rear surface cooler outlet temperature control instrument 11.

[0026] A humidity control instrument 12 is further provided on the outlet pipeline of the adsorption zone of the dehumidifying wheel 5. The humidity control instrument 12 is signal-interlocked with the regeneration heater 8. According to the humidity of the exhaust air at the outlet of the adsorption zone of the dehumidifying wheel 5, the heating temperature of the regeneration air by the regeneration heater 8 is regulated. When the humidity of the air entering the production workshop is relatively high, the heating temperature of the regeneration heater 8 is correspondingly increased. Conversely, the heating temperature of the regeneration heater 8 can be correspondingly decreased.

[0027] An adjusting air valve 14 is provided on the outlet pipeline of the regeneration air circulation fan 13.

[0028] The present invention also discloses a process of a single-stage rotary wheel low dew point air dehumidification device with partial regeneration air circulation, including the following steps: S1: Fresh air from the atmosphere is filtered and cooled to below 12°C, and then mixed with the air discharged from the low-humidity air passage in the production workshop. The humidity of the mixed air is below 2.0 g / kg and the temperature is below 25°C. The mixed air is conveyed by the treatment fan 3 and cooled to below 12°C by the middle surface cooler 4; S2: The air discharged from the middle surface cooler 4 is divided into two paths. The air volume of the first path is below 1 / 6 of the total air volume. The first path of air blows into the cold blow zone of the dehumidification rotor 5 to cool the dehumidification rotor 5. The second path of air blows into the adsorption zone of the dehumidification rotor 5 for further dehumidification. After the dehumidified air is sent into the low-humidity air passage in the production workshop, it returns to be mixed with the cooled fresh air from the atmosphere again; S3: The air discharged from the cold blow zone of the dehumidification rotor 5 in step S2 is mixed with the regeneration air from the regeneration air circulation fan 13, heated to 100 - 135°C by the regeneration heater 8, and then blown into the regeneration zone of the dehumidification rotor 5. After that, it is divided into two paths. The air volume of the first path of regeneration air is 1 / 5 - 4 / 5 of the total regeneration air volume. The first path of regeneration air is sucked in and pressurized by the regeneration air circulation fan 13 and then returns to the inlet of the regeneration heater 8 again. For the second path of regeneration air, since the air pressure (static pressure) here is still above 400 Pa, it can be discharged to the atmosphere through the air pipeline without adding a booster fan.

[0029] Further, in step S2, the humidity of the dehumidified air at the outlet of the adsorption zone of the dehumidification rotor 5 is below 0.0124 g / kg.

[0030] Further, in step S3, the air temperature at the outlet of the cold blow zone of the dehumidification rotor 5 is 60 - 90°C, and the air temperature at the outlet of the regeneration zone of the dehumidification rotor 5 is 60 - 90°C; the air volume of the first path of regeneration air is 45 - 55% of the total regeneration air volume.

[0031] The key point of the present invention is to adopt the method of single-stage dehumidification rotor regeneration circulating air, and a regeneration circulation fan 13 is added, so that the single-stage dehumidification rotor 5 can be regenerated more thoroughly. Since the pre-stage dehumidification rotor and its regeneration heating system are eliminated, not only the cost of the equipment is reduced, but also the regeneration heating energy consumption is reduced.

[0032] Example 1: Taking a set of "partially regenerated air circulation double-rotor air dehumidification equipment" installed in a company in Chengdu in May 2025 as an example, the equipment with the structure as Figure 1 described is used for dehumidification and drying. The low-humidity air volume of the equipment is 8500 m 3 / h (that is, the air volume discharged from the adsorption zone of the dehumidification rotor, which is also the dry air volume sent into the production workshop is 8500 m 3 / h). Since the pre-stage dehumidification rotor and its regeneration system are not operated, the fresh air volume for the regeneration of the dehumidification rotor 5 is 1350 m 3 / h. The fresh air from the atmosphere is cooled to 12°C and has a humidity of 8.3 g / kg by the front surface cooler 2. After mixing with the return air from the production workshop and passing through the processing fan 3, the air temperature is 23°C and the humidity is 1.57 g / kg. After being cooled to 12°C by the middle surface cooler, it is divided into two paths, namely the first path of low-humidity air and the second path of cold air blow. The air volume of the first path of low-humidity air is 8500 m 3 / h. After being dehumidified by the single-stage dehumidification rotary wheel 5, the dew point of the low-humidity air reaches below -55°C, that is, the humidity reaches below 0.0124 g / kg, and the temperature is 16°C; the air volume of the second path of cold air blow is 1350 m 3 / h. After the cold air blow passes through the cold air blowing area of the dehumidification rotary wheel 5, the temperature of the cold air blown out is 70°C.

[0033] The regeneration circulation air volume of the single-stage dehumidification rotary wheel is 700 m 3 / h, that is, the air volume of the regeneration air return from the regeneration air circulation fan 13 is 700 m 3 / h. It is mixed with the cold air blown out from the dehumidification rotary wheel 5, and the mixed air volume is 2050 m 3 / h, the temperature is 72°C, and the humidity is about 4.9 g / kg. Then, after being heated and raised to about 125°C by the regeneration heater 8, it enters the regeneration area of the dehumidification rotary wheel 5. During this process, the average regeneration inlet air temperature of the single-stage dehumidification rotary wheel is 125°C, and the regeneration outlet air temperature of the single-stage dehumidification rotary wheel is 73°C and the humidity is about 11.4 g / kg. Therefore, the energy consumption of the regeneration heater 8 of the single-stage dehumidification rotary wheel is 36.3 kw. Since the energy consumption of the regeneration air circulation fan 13 is significantly less than the energy consumption of the regeneration heater 8, the total regeneration energy consumption is about 36.3 kw.

[0034] Control Example 1: Control Example 1 repeats the operation steps of Example 1, and the difference is only that "the regeneration air circulation fan 13 and the regulating air valve 14 are closed", and other conditions remain unchanged. That is, in fact, Control Example 1 uses equipment with the structure as Figure 2 described for dehumidification and drying.

[0035] Under the experimental conditions of Control Example 1, the low-humidity air volume of Control Example 1 is 8500 m 3 / h, and the fresh air volume for the regeneration of the dehumidification rotary wheel 5 is 1350 m 3 / h. The fresh air from the atmosphere is cooled to 12°C and has a humidity of 8.3 g / kg by the front surface cooler 2. After mixing with the return air from the production workshop, after being cooled to 12°C by the middle surface cooler, it is divided into two paths, namely the first path of low-humidity air and the second path of cold air blow. The air volume of the first path of low-humidity air is 8500 m 3 / h, and it is dehumidified by the single-stage dehumidification rotary wheel 5; the air volume of the second path of cold air blow is 1350 m 3 / h. After the cold blowing air passes through the cold blowing area of the dehumidification rotor 5, it is heated by the regeneration heater 8 to about 125 °C and then enters the regeneration area of the dehumidification rotor 5.

[0036] According to the operation process of Comparative Example 1, both the cold blowing air and the regeneration exhaust air are about 60 °C. The dew point of the low humidity air dehumidified by the adsorption area of the single-stage dehumidification rotor 5 is only -36 °C, that is, the moisture content is 0.1214 g / kg, which is difficult to meet the humidity requirements of application fields with low humidity requirements. The regeneration energy consumption at this time is 29.3 kw.

[0037] The "partial regeneration air circulation single-stage rotor low dew point air dehumidification equipment" of the present application only adds a regeneration circulation fan 13, a regulating air valve 14, and connecting air ducts, etc., and eliminates the pre-stage dehumidification rotor and its regeneration system. Since the regeneration circulation air volume has little impact on the outlet air humidity after reaching a certain amount, the operation of adjusting the regeneration circulation air volume through the regulating air valve is very simple.

[0038] The present application found through experiments that according to the operation process of Comparative Example 1, without using regeneration air circulation, only simply increasing the fresh air volume for the regeneration of the dehumidification rotor 5 and / or increasing the heating energy consumption of the regeneration heater 8, in this case, the dehumidification effect that can be achieved is that the low humidity air dehumidified by the adsorption area of the single-stage dehumidification rotor 5 is also difficult to reach below the dew point of -55 °C. The reason analysis is as follows: 1) If the fresh air volume for regeneration is increased, the humidity of the mixed air after mixing with the workshop return air will increase accordingly, and the outlet air humidity after being processed by the dehumidification rotor will also increase. 2) When the heating regeneration temperature of the regeneration heater 8 reaches above 130 °C, further increasing the regeneration temperature cannot reduce the humidity of the processed outlet air. At this time, the mass transfer resistance is mainly the problem of the regeneration air velocity, and the regeneration temperature cannot be too high (such as not exceeding 150 °C, otherwise the service life of the equipment will be greatly reduced).

[0039] For single-stage dehumidification rotor dehumidification, it is usually only used in ordinary low humidity environments and is not suitable for low dew point environments. Currently, the following process of single-stage dehumidification rotors is usually adopted in the prior art: The single-stage dehumidification rotor only has an adsorption area and a regeneration area, without a cold blowing area. The fresh air from the atmosphere is directly heated by the regeneration heater and then enters the regeneration area, and then the regeneration exhaust air is directly discharged. With such a process, the humidity of the outlet air of the adsorption area of the single-stage dehumidification rotor usually cannot reach below 0.2 g / kg, and the energy consumption of regeneration heating is relatively high.

[0040] The present application uses the equipment with the structure as Figure 1 described for dehumidification and drying. Compared with the existing conventional double-stage dehumidification rotor dehumidification, the equipment cost can be greatly reduced; compared with the existing conventional single-stage dehumidification rotor dehumidification, the dew point of the air after dehumidification in the present application can be better reduced to an extremely low level, and it is better applied to low humidity environments.

[0041] The content described in this specification is only an enumeration of the implementation forms of the inventive concept, and the protection scope of the present invention should not be regarded as limited to the specific forms stated in the embodiments.

Claims

1. A single-stage runner low dew point air dehumidification device with partial regeneration air circulation, characterized in that, It includes a dehumidification rotary wheel (5), a front surface cooler (2) and a processing fan (3). The processing fan (3) includes two inlets. The dehumidification rotary wheel (5) includes an adsorption zone, a cold blow zone and a regeneration zone; An intake air duct. The upstream of the intake air duct is for fresh air from the atmosphere to enter. The downstream of the intake air duct is sequentially connected to the front surface cooler (2) and the first inlet of the processing fan (3). The outlet of the processing fan (3) is connected to the inlet of the adsorption zone of the dehumidification rotary wheel (5) by a pipeline. The outlet of the adsorption zone of the dehumidification rotary wheel (5) is connected to the second inlet of the processing fan (3) by a pipeline through the air supply channel for production workshop, forming a dry air supply circulation loop; A regeneration air duct. The upstream of the regeneration air duct is connected to the outlet of the processing fan (3) for introducing a cold blowing air. The downstream of the regeneration air duct is sequentially connected to the cold blow zone of the dehumidification rotary wheel (5), a regeneration heater (8) and the regeneration zone of the dehumidification rotary wheel (5). The outlet of the regeneration zone of the dehumidification rotary wheel (5) is divided into two paths. One path is discharged to the atmosphere, and the other path is sequentially connected to the regeneration air circulation fan (13) and the inlet of the regeneration heater (8) by a pipeline, forming a regeneration air circulation loop.

2. The single-stage runner low dew point air dehumidification device with partial regeneration air circulation according to claim 1, wherein, A fresh air filter (1) is provided on the intake air duct at the front end of the front surface cooler (2). A front surface cooler outlet air temperature control instrument (9) is provided on the intake air duct at the rear end of the front surface cooler (2). The front surface cooler outlet air temperature control instrument (9) is signal interlocked with the front surface cooler (2).

3. The single-stage runner low dew point air dehumidification device with partial regeneration air circulation according to claim 1, characterized in that, A middle surface cooler (4) and a middle surface cooler outlet air temperature control instrument (10) are provided on the intake air duct between the outlet of the processing fan (3) and the inlet of the adsorption zone of the dehumidification rotary wheel (5). The upstream of the regeneration air duct is connected to the outlet of the middle surface cooler (4). The middle surface cooler outlet air temperature control instrument (10) is signal interlocked with the middle surface cooler (4).

4. The single-stage runner low dew point air dehumidification equipment with partial regeneration air circulation as claimed in claim 1, characterized in that, A rear surface cooler (6), a medium efficiency filter (7) and a rear surface cooler outlet air temperature control instrument (11) are provided on the pipeline of the outlet of the adsorption zone of the dehumidification rotary wheel (5). The rear surface cooler outlet air temperature control instrument (11) is signal interlocked with the rear surface cooler (6).

5. The single-stage runner low dew point air dehumidification device with partial regeneration air circulation according to claim 1, characterized in that, A humidity control instrument (12) is also provided on the pipeline of the outlet of the adsorption zone of the dehumidification rotary wheel (5). The humidity control instrument (12) is signal interlocked with the regeneration heater (8).

6. The single-stage runner low dew point air dehumidification equipment with partial regeneration air circulation as described in claim 1, characterized in that, A regulating air valve (14) is provided on the pipeline of the outlet of the regeneration air circulation fan (13).

7. Process of a single-stage rotary wheel low dew point air dehumidification device with partial regeneration air circulation, characterized in that, It includes the following steps: S1: The fresh air from the atmosphere is filtered and cooled to below 12°C, and mixed with the air from the outlet of the low-humidity air supply channel of the production workshop. The humidity of the mixed air is below 2.0 g / kg and the temperature is below 25°C. The mixed air is conveyed by the processing fan (3) and cooled to below 12°C by the middle surface cooler (4); S2: The air from the outlet of the middle surface cooler (4) is divided into two paths. The air volume of the first path is below 1 / 6 of the total air volume. The first path of air is blown into the cold blow zone of the dehumidification rotary wheel (5) to cool the dehumidification rotary wheel (5). The second path of air is blown into the adsorption zone of the dehumidification rotary wheel (5) for further dehumidification. After the dehumidified air is sent into the low-humidity air supply channel of the production workshop, it returns to be mixed with the cooled fresh air from the atmosphere again; S3: The air discharged from the cold blow zone of the dehumidification wheel (5) in step S2 is mixed with the regeneration air from the regeneration air circulation fan (13), heated to 100 - 135 °C by the regeneration heater (8), and then blown into the regeneration zone of the dehumidification wheel (5). After that, it is divided into two paths. The air volume of the first path of the regeneration air is 1 / 5 - 4 / 5 of the total regeneration air volume. The first path of the regeneration air is sucked in and pressurized by the regeneration air circulation fan (13) and then returned to the inlet of the regeneration heater (8) again. The second path of the regeneration air is exhausted.

8. The process according to claim 7, characterized in that, In step S2, the humidity of the dehumidified air at the outlet of the adsorption zone of the dehumidification wheel (5) is below 0.0124 g / kg.

9. The process according to claim 7, characterized in that, In step S3, the outlet air temperature of the cold blow zone of the dehumidification wheel (5) is 60 - 90 °C, and the outlet air temperature of the regeneration zone of the dehumidification wheel (5) is 60 - 90 °C; the air volume of the first path of the regeneration air is 45 - 55% of the total regeneration air volume.

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