Single-stage rotating wheel low-dew-point air dehumidification equipment with partial regeneration air circulation

Abstract

The utility model discloses partial regeneration air circulation single-stage rotating wheel low-dew-point air dehumidification equipment which 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] This application relates to the field of air dehumidification technology, and in particular to a single-stage rotary low dew point air dehumidification device that uses partial regenerated air circulation, 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.

[0004] To improve dehumidification efficiency, existing technologies often employ a two-stage dehumidification rotor system, which results in relatively high equipment investment costs. Utility Model Content

[0005] In view of the above-mentioned technical problems existing in the prior art, the purpose of this application is to provide a single-stage rotary low dew point air dehumidification device with partial regenerated air circulation.

[0006] The technical solution adopted in this invention is as follows:

[0007] A single-stage rotary low dew point air dehumidification device with partial regeneration air circulation includes a dehumidification rotor, a pre-cooler, and a handling fan. The handling fan has two inlets, and the dehumidification rotor includes an adsorption zone, a cold blowing zone, and a regeneration zone.

[0008] The intake duct is used for the intake of fresh air. The downstream of the intake duct is 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 dehumidifying wheel by a pipeline. The outlet of the adsorption zone of the dehumidifying wheel is connected to the second inlet of the processing fan through the air supply channel of the production workshop by a pipeline, forming a drying air circulation loop.

[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 blowing zone of the dehumidification rotor, the regeneration heater, and the regeneration zone of the dehumidification rotor. The outlet of the regeneration zone of the dehumidification rotor is divided into two paths: one path is discharged to the atmosphere, and the other path is sequentially connected to the inlet of the regeneration air circulation fan and the regeneration heater through pipelines to form a regeneration air circulation loop.

[0010] Furthermore, a fresh air filter is installed on the air intake duct at the front end of the front surface cooler, and a front surface cooler outlet air temperature control instrument is installed on the air intake duct at the rear end of the front surface cooler. The front surface cooler outlet air temperature control instrument is interlocked with the front surface cooler signal.

[0011] Furthermore, a medium surface cooler and a medium surface cooler outlet temperature control instrument are installed on the air intake duct between the outlet of the processing fan and the inlet of the adsorption zone of the dehumidification rotor. The upstream of the regeneration duct is connected to the outlet of the medium surface cooler, and the medium surface cooler outlet temperature control instrument is signal-interlocked with the medium surface cooler.

[0012] Furthermore, a post-cooler, a medium-efficiency filter, and a post-cooler outlet air temperature control instrument are installed on the outlet pipe of the adsorption zone of the dehumidification rotor. The post-cooler outlet air temperature control instrument is signal-interlocked with the post-cooler.

[0013] Furthermore, a humidity control instrument is also installed on the outlet pipe of the adsorption zone of the dehumidifying impeller, and the humidity control instrument is signal-interlocked with the regeneration heater.

[0014] Furthermore, a regulating valve is installed on the outlet pipe of the regenerated air circulating fan.

[0015] The process of a single-stage rotary low-dew-point air dehumidifier with partial regenerated air circulation includes the following steps:

[0016] S1: Fresh air from the atmosphere is filtered and cooled to below 12°C, and then mixed with the exhaust air from the low-humidity air duct of the production workshop. The humidity of the mixed air is below 2.0g / kg and the temperature is below 25°C. The mixed air is transported by the processing fan and cooled to below 12°C by the intermediate surface cooler.

[0017] S2: The air outlet of the medium surface cooler is divided into two paths. The air volume of the first path is less than 1 / 6 of the total air volume. The first path of air is blown into the cold blowing area of ​​the dehumidification wheel to cool the dehumidification wheel. The second path of air is blown into the adsorption area of ​​the dehumidification wheel for further dehumidification. After dehumidification, the air is sent into the low humidity air duct of the production workshop and then returns to mix with the cooled fresh air.

[0018] S3: In step S2, the air from the cold blowing zone of the dehumidifying rotor is mixed with the regenerated air from the regenerated air circulation fan. After being heated to 100-135℃ by the regenerated heater, it is blown into the regeneration zone of the dehumidifying rotor. Then it is divided into two paths. The air volume of the first path of regenerated air is 1 / 5-4 / 5 of the total regenerated air volume. The first path of regenerated air is drawn in and pressurized by the regenerated air circulation fan and then returned to the inlet of the regenerated heater. The second path of regenerated air is exhausted.

[0019] Furthermore, in step S2, the humidity of the dehumidified air at the outlet of the dehumidifying rotor adsorption zone is below 0.0124 g / kg.

[0020] Furthermore, in step S3, the outlet air temperature of the cold blowing zone of the dehumidifying rotor is 60-90℃, and the outlet air temperature of the regeneration zone of the dehumidifying rotor is 60-90℃; the air volume of the first regeneration air is 45-55% of the total regeneration air volume.

[0021] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0022] 1) After drying in the production workshop, the humidity of the exhaust air is usually significantly lower than that of the fresh air. This application reuses the exhaust air from the production workshop, which can effectively save energy consumption of the subsequent dehumidification rotor. The single-stage rotor low dew point air dehumidification device with partial regenerated air circulation of the present invention adopts a single-stage dehumidification rotor and adds a regenerated air circulation fan to carry out a process of partial regenerated air circulation heating and regeneration. The dew point of the dehumidified low-humidity air can reach below -55°C. At the same time, it eliminates the need for the previous dehumidification rotor and its regeneration heating system. Therefore, it not only reduces equipment costs but also reduces the energy consumption of heating and regeneration.

[0023] 2) When using the equipment of this application for dehumidification, the temperature, circulating air volume and other conditions of each stage of the airflow can be controlled, which can greatly reduce the amount of new fresh air 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 amount of new fresh air used for regeneration is less than 1 / 6 of the low humidity air volume required by the production workshop. While achieving a good dehumidification effect, the regeneration energy consumption is greatly reduced. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a single-stage rotary low-dew-point air dehumidification device with partial regeneration air circulation according to the present invention.

[0025] Figure 2 This is a schematic diagram of the structure of a single-stage rotary low dew point air dehumidifier based on existing technology. Detailed Implementation

[0026] The present invention will be further described below with reference to specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0027] Example: Control Figure 1

[0028] A single-stage rotary low dew point air dehumidification device with partial regeneration air circulation includes a dehumidification rotor 5, a fresh air filter 1, a pre-cooler 2, a handling fan 3, and a middle cooler 4. The handling fan 3 includes two inlets, and the dehumidification rotor 5 includes an adsorption zone, a cold blowing zone, and a regeneration zone.

[0029] 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 fresh air filter 1, 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 adsorption zone inlet of the dehumidification rotor 5 through the middle surface cooler 4 by a pipeline. The adsorption zone outlet of the dehumidification rotor 5 is connected to the second inlet of the processing fan 3 through the air supply channel of the production workshop by a pipeline, forming a drying air circulation loop.

[0030] The regeneration air duct is connected upstream to the outlet pipe of the intermediate surface cooler 4 to introduce a stream of cold air. Downstream, the regeneration air duct is connected in sequence to the cold blowing zone of the dehumidification rotor 5, the regeneration heater 8, and the regeneration zone of the dehumidification rotor 5. The outlet of the regeneration zone of the dehumidification rotor 5 is divided into two paths: one path is discharged to the atmosphere, and the other path is connected in sequence to the inlet of the regeneration air circulation fan 13 and the regeneration heater 8 by pipes to form a regeneration air circulation loop.

[0031] A front surface cooler outlet air temperature control instrument 9 is installed on the air intake 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. The cooling temperature of the front surface cooler 2 is regulated by the front surface cooler outlet air temperature control instrument 9.

[0032] A medium surface cooler outlet air temperature control instrument 10 is installed on the outlet pipe of the medium surface cooler 4, and the medium surface cooler outlet air temperature control instrument 10 is signal-interlocked with the medium surface cooler 4. The cooling temperature of the medium surface cooler 4 is regulated by the medium surface cooler outlet air temperature control instrument 10.

[0033] A post-cooler 6, a medium-efficiency filter 7, and a post-cooler outlet air temperature control instrument 11 are installed on the outlet pipe of the adsorption zone of the dehumidification impeller 5. The post-cooler outlet air temperature control instrument 11 is signal-interlocked with the post-cooler 6. The cooling temperature of the post-cooler 6 is regulated by the post-cooler outlet air temperature control instrument 11.

[0034] A humidity control instrument 12 is also installed on the outlet pipe of the adsorption zone of the dehumidifying impeller 5. The humidity control instrument 12 is signal-interlocked with the regeneration heater 8. The heating temperature of the regeneration heater 8 on the regeneration air is adjusted according to the humidity of the exhaust air at the outlet of the adsorption zone of the dehumidifying impeller 5. When the humidity of the air entering the production workshop is high, the heating temperature of the regeneration heater 8 is increased accordingly, and vice versa.

[0035] A regulating valve 14 is installed on the outlet pipe of the regenerated air circulating fan 13.

[0036] This invention also discloses a process for a single-stage rotary low-dew-point air dehumidification device with partial regenerated air circulation, comprising the following steps:

[0037] S1: Fresh air from the atmosphere is filtered and cooled to below 12°C, and then mixed with the exhaust air from the low-humidity air duct of the production workshop. The humidity of the mixed air is below 2.0g / kg and the temperature is below 25°C. The mixed air is transported by the processing fan 3 and cooled to below 12°C by the intermediate surface cooler 4.

[0038] S2: The air outlet of the medium surface cooler 4 is divided into two paths. The air volume of the first path is less than 1 / 6 of the total air volume. The first path of air is blown into the cold blowing zone of the dehumidification rotor 5 to cool the dehumidification rotor 5. The second path of air is blown into the adsorption zone of the dehumidification rotor 5 for further dehumidification. After dehumidification, the air is sent into the low humidity air duct of the production workshop and then returns to mix with the cooled fresh air.

[0039] S3: In step S2, the air from the cold blowing zone of the dehumidifying rotor 5 is mixed with the regenerated air from the regenerated air circulation fan 13. After being heated to 100-135℃ by the regenerated heater 8, it is blown into the regeneration zone of the dehumidifying rotor 5. Then it is divided into two paths. The air volume of the first path of regenerated air is 1 / 5-4 / 5 of the total regenerated air volume. The first path of regenerated air is drawn in and pressurized by the regenerated air circulation fan 13 and then returned to the inlet of the regenerated heater 8. The second path of regenerated air, since the air pressure (static pressure) here is still above 400Pa, can be discharged to the atmosphere through the air duct without the need to add a booster fan.

[0040] Furthermore, in step S2, the humidity of the dehumidified air at the outlet of the adsorption zone of the dehumidifying rotor 5 is below 0.0124 g / kg.

[0041] Furthermore, in step S3, the outlet air temperature of the cold blowing zone of the dehumidifying rotor 5 is 60-90℃, and the outlet air temperature of the regeneration zone of the dehumidifying rotor 5 is 60-90℃; the air volume of the first regeneration air is 45-55% of the total regeneration air volume.

[0042] The key feature of this invention is the adoption of a single-stage dehumidifying rotor regeneration circulation system, with the addition of a regeneration circulation fan 13, which enables more thorough regeneration of the single-stage dehumidifying rotor 5. By eliminating the need for the preceding dehumidifying rotor and its regeneration heating system, not only are equipment costs reduced, but also regeneration heating energy consumption is lowered.

[0043] Example 1:

[0044] Taking a "partially regenerated air circulation dual-rotor air dehumidifier" installed in a company in Chengdu in May 2025 as an example, it adopts the following... Figure 1 The equipment described above performs dehumidification and drying. The low-humidity airflow rate of the equipment is 8500 m³ / h. 3 / h (that is, the air volume output from the dehumidification rotor adsorption zone, which is also the drying air volume supplied to the production workshop is 8500m³) 3 / h). Since the pre-stage dehumidifier rotor and its regeneration system are not in operation, the fresh air volume used for the regeneration of dehumidifier rotor 5 is 1350 m³ / h.3 / h, fresh air from the atmosphere is cooled to 12℃ and has a humidity of 8.3g / kg by the pre-cooler 2. This air mixes with the return air from the production workshop and passes through the processing fan 3. The resulting air temperature is 23℃ and humidity is 1.57g / kg. After being cooled to 12℃ by the intermediate cooler, it is divided into two paths: a first path of low-humidity air and a second path of cold air. The airflow of the first path of low-humidity air is 8500m³ / h. 3 / h, after dehumidification by the single-stage dehumidification rotor 5, the low moisture dew point reaches below -55℃, that is, the humidity reaches below 0.0124g / kg, and the temperature is 16℃; the air volume of the second cold air blower is 1350 m³ / h. 3 / h, after the cold air passes through the cold air zone of the dehumidifying rotor 5, the cold air outlet temperature is 70℃.

[0045] The regeneration circulation air volume of a single-stage dehumidifier rotor is 700 m³ / h. 3 / h, meaning the regenerated air return air volume from the regenerated air circulating fan 13 is 700m³ / h. 3 / h, it mixes with the cold air blown out by the dehumidifying rotor 5, and the mixed air volume is 2050 m³ / h. 3 The air temperature is 72℃ and the humidity is approximately 4.9 g / kg. After being heated to approximately 125℃ by the regeneration heater 8, it enters the regeneration zone of the dehumidifier rotor 5. During this process, the average regeneration inlet air temperature of the single-stage dehumidifier rotor is 125℃, and the regeneration outlet air temperature of the single-stage dehumidifier rotor is 73℃ with a humidity of approximately 11.4 g / kg. Therefore, the energy consumption of the regeneration heater 8 of the single-stage dehumidifier rotor is 36.3 kW. Since the energy consumption of the regeneration air circulation fan 13 is significantly less than that of the regeneration heater 8, the total regeneration energy consumption is approximately 36.3 kW.

[0046] Compare with Example 1:

[0047] Comparative Example 1 repeats the operation steps of Example 1, except that "the regenerated air circulation fan 13 and the regulating damper 14 are turned off," while other conditions remain unchanged. In fact, Comparative Example 1 employs the following... Figure 2 The equipment with the described structure performs dehumidification and drying.

[0048] In the experimental conditions of Control Example 1, the low-humidity air volume was 8500 m³ / h. 3 / h, the fresh air volume used for regeneration of dehumidifying rotor 5 is 1350 m³ / h. 3 / h, fresh air from the atmosphere is cooled to 12℃ and has a humidity of 8.3g / kg by the front surface cooler 2. After mixing with the return air from the production workshop, it is cooled to 12℃ by the middle surface cooler and then split into two paths: a first path of low-humidity air and a second path of cold air. The airflow of the first path of low-humidity air is 8500m³ / h. 3 / h, dehumidified by a single-stage dehumidification rotor 5; the second airflow path has an air volume of 1350 m³ / h. 3 / h, after passing through the cold blowing zone of the dehumidifying rotor 5, the cold air is heated to about 125°C by the regeneration heater 8 and then enters the regeneration zone of the dehumidifying rotor 5.

[0049] Following the operating procedure of Comparative Example 1, both the cold-blown air outlet and the regenerated air outlet are around 60°C. After dehumidification in the adsorption zone of the single-stage dehumidification rotor 5, the dew point of the low-humidity air is only -36°C, meaning the moisture content is 0.1214 g / kg, which is insufficient to meet the humidity requirements of low-humidity applications. The regeneration energy consumption at this time is 29.3 kW.

[0050] This application, "Partial Regenerative Air Circulation Single-Stage Rotary Low Dew Point Air Dehumidification Equipment," simply adds a regenerative circulation fan 13, a regulating damper 14, and connecting ducts, while eliminating the need for the pre-stage dehumidification rotor and its regeneration system. Since the regenerative circulation airflow becomes less sensitive to the outlet air humidity once it reaches a certain volume, adjusting the regenerative circulation airflow via the regulating damper is very simple.

[0051] This application, through experiments, found that, following the operating procedure of Comparative Example 1, without using regeneration air circulation, simply increasing the fresh air volume for regeneration of the dehumidification rotor 5 and / or increasing the heating energy consumption of the regeneration heater 8, the dehumidification effect achieved, even with the low-humidity air after dehumidification in the adsorption zone of the single-stage dehumidification rotor 5, is still difficult to reach a dew point below -55℃. The reasons are analyzed 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 humidity of the outlet air after treatment by the dehumidification rotor will also increase. 2) When the heating and regeneration temperature of the regeneration heater 8 reaches above 130℃, further increasing the regeneration temperature cannot reduce the humidity of the treated outlet air. At this time, the mass transfer resistance is mainly due to the regeneration air velocity. Furthermore, the regeneration temperature cannot be too high (e.g., it cannot exceed 150℃, otherwise it will significantly reduce the service life of the equipment).

[0052] Single-stage dehumidifier rotors are typically used only in ordinary low-humidity environments and are not suitable for low dew point environments. Current technologies often employ the following single-stage dehumidifier rotor process: the rotor only has an adsorption zone and a regeneration zone, without a cold-blowing zone. Fresh air from the atmosphere is directly heated by a regeneration heater before entering the regeneration zone, and then the regenerated exhaust air is directly discharged. With this process, the humidity of the exhaust air from the adsorption zone of the single-stage dehumidifier rotor is usually difficult to reach below 0.2 g / kg, and the energy consumption for regeneration heating is relatively high.

[0053] This application adopts the following... Figure 1 The device described above performs dehumidification and drying, which can greatly reduce equipment costs compared to existing conventional two-stage dehumidification rotary dehumidification; compared to existing conventional single-stage dehumidification rotary dehumidification, the dew point of the dehumidified air in this application can be reduced to an extremely low level, making it more suitable for low-humidity environments.

[0054] The contents described in this specification are merely an enumeration of the implementation forms of the inventive concept, and the scope of protection of this invention should not be regarded as limited to the specific forms described in the embodiments.

Claims

1. A single-stage rotary low-dew-point air dehumidification device with partial regenerated air circulation, characterized in that, It includes a dehumidifying impeller (5), a front surface cooler (2) and a processing fan (3). The processing fan (3) includes two inlets. The dehumidifying impeller (5) 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 air intake duct is connected to the first inlet of the front surface cooler (2) and the processing fan (3) in sequence. The outlet of the processing fan (3) is connected to the inlet of the adsorption zone of the dehumidifying impeller (5) by a pipeline. The outlet of the adsorption zone of the dehumidifying impeller (5) is connected to the second inlet of the processing fan (3) through the air supply channel of the production workshop by a pipeline, forming a drying air circulation loop. The regeneration air duct is connected upstream to the outlet of the processing fan (3) to introduce a cold blowing air. Downstream of the regeneration air duct is connected in sequence to the cold blowing zone of the dehumidifying impeller (5), the regeneration heater (8), and the regeneration zone of the dehumidifying impeller (5). The outlet of the regeneration zone of the dehumidifying impeller (5) is divided into two paths. One path is discharged to the atmosphere, and the other path is connected to the inlet of the regeneration air circulation fan (13) and the regeneration heater (8) in sequence by pipelines to form a regeneration air circulation loop.

2. The single-stage rotary low-dew-point air dehumidification device with partial regenerated air circulation as described in claim 1, characterized in that, A fresh air filter (1) is installed on the air intake duct at the front end of the front surface cooler (2), and a front surface cooler outlet air temperature control instrument (9) is installed on the air intake 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 rotary low-dew-point air dehumidification device with partial regenerated air circulation as described in claim 1, characterized in that, A medium surface cooler (4) and a medium surface cooler outlet temperature control instrument (10) are installed on the air intake duct between the outlet of the processing fan (3) and the adsorption zone inlet of the dehumidification rotor (5). The upstream of the regeneration duct is connected to the outlet of the medium surface cooler (4), and the medium surface cooler outlet temperature control instrument (10) is signal-interlocked with the medium surface cooler (4).

4. The single-stage rotary low-dew-point air dehumidification device with partial regenerated air circulation as described in claim 1, characterized in that, A post-cooler (6), a medium-efficiency filter (7), and a post-cooler outlet air temperature control instrument (11) are installed on the adsorption zone outlet pipe of the dehumidification impeller (5). The post-cooler outlet air temperature control instrument (11) is signal-interlocked with the post-cooler (6).

5. The single-stage rotary low-dew-point air dehumidification device with partial regenerated air circulation as described in claim 1, characterized in that, A humidity control instrument (12) is also installed on the outlet pipe of the adsorption zone of the dehumidification impeller (5), and the humidity control instrument (12) is signal-interlocked with the regeneration heater (8).

6. The single-stage rotary low-dew-point air dehumidification device with partial regenerated air circulation as described in claim 1, characterized in that, A regulating valve (14) is installed on the outlet pipe of the regenerated air circulating fan (13).

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