Ultralow dew point rotating wheel dehumidification device and dehumidification system

Abstract

The invention relates to the technical field of rotary wheel dehumidifiers, in particular to an ultralow dew point rotary wheel dehumidification device and a dehumidification system.The rotary wheel dehumidification device is provided with an air inlet, an air supply outlet and a second exhaust outlet and comprises a second moisture absorption rotary wheel, a first dry gas flow path and a second dry gas flow path; the second moisture absorption rotating wheel is provided with a second moisture absorption area, a cooling area and a second regeneration area, an air outlet of the second regeneration area is connected with a second exhaust port through an air path, and an air inlet of the second regeneration area is connected with a regeneration air source through an air path; the second dry gas flow path passes through the cooling area, the air inlet end is in gas path connection with the first dry gas flow path between the air inlet and the air inlet of the second moisture absorption area, and the air outlet end is in gas path connection with the first dry gas flow path between the air outlet of the second moisture absorption area and the air supply outlet; the rotary wheel dehumidification device and the dehumidification system have the advantage that the heating load of the rear heater can be reduced.

Description

Technical Field

[0001] This invention relates to the field of dehumidifier technology, and in particular to an ultra-low dew point rotary dehumidifier and dehumidification system. Background Technology

[0002] In lithium battery cell manufacturing processes, post-processing workshops such as formation and impregnation require specific air supply conditions, including both humidity and temperature. Generally, the dew point temperature of the supplied air must be below -45°C (DP), and the supply temperature must be at least 45°C. Therefore, fresh air entering the workshop needs to be dehumidified by a dehumidification system. Rotary dehumidifiers are widely used in these production workshops. Compared to compressor dehumidifiers, they can control ambient humidity below 2%RH and are suitable for dehumidification in low-temperature environments. However, in some cases, compared to compressor dehumidifiers, rotary dehumidifiers or dehumidification systems incorporating rotary dehumidifiers have drawbacks such as higher energy consumption and heavier heater loads.

[0003] For example, the applicant of this application disclosed a multi-rotor ultra-low dew point dehumidifier and a multi-rotor ultra-low dew point dehumidification system in Chinese patent document with publication date of July 17, 2024 and publication number CN118816299A. The multi-rotor ultra-low dew point dehumidifier includes a first dehumidification rotor assembly and a second dehumidification rotor assembly. The first dehumidification rotor assembly includes at least a first adsorption zone and a first regeneration zone. The second dehumidification rotor assembly includes at least a second adsorption zone, a second cooling zone, a second regeneration zone, and a regeneration heater. The regeneration heater, the second regeneration zone, the first regeneration zone, and the dehumidifier exhaust outlet are sequentially connected by air paths to form a regeneration exhaust flow path. The air supply outlet, the first adsorption zone, the second adsorption zone, and the ultra-low dew point air outlet are sequentially connected by air paths to form a dehumidification gas flow path. The air inlet of the second cooling zone is connected to the pipeline air path between the first adsorption zone and the second adsorption zone. The air outlet of the second cooling zone is connected to the regeneration return pipeline air path. The regeneration air volume of the second regeneration zone of the second dehumidification rotor assembly is partly provided by the air outlet of the second cooling zone. If it is insufficient, a portion of the air from the air outlet of the second adsorption zone is supplemented through the regeneration return pipe. The remaining ultra-low dew point air discharged from the air outlet of the second adsorption zone needs to be heated by the post-heater to reach the required air supply temperature of the workshop before being sent into the workshop.

[0004] This solution has at least the following drawbacks: the dry air discharged from the dehumidification gas flow path or the outlet of the second adsorption zone needs to be used as regeneration gas and supplied to the second regeneration zone by the regeneration return pipeline, i.e., the second air return pipeline. Therefore, the air supply volume will be reduced under rated air pressure conditions. In addition, the outlet air temperature of the second adsorption zone is low. In order to heat it to the required air supply temperature, the post-heater needs to continuously bear a large heating load, which increases the energy consumption of the rotary dehumidifier and raises the operating cost.

[0005] Therefore, how to reduce the operating load of the afterheater and thus reduce equipment energy consumption while meeting the requirements of air volume and dry air temperature in the production workshop has become an urgent problem to be solved. Summary of the Invention

[0006] To overcome the shortcomings of the prior art, the present invention provides an ultra-low dew point rotary dehumidifier and dehumidification system, which has the advantages of increasing the air supply volume while reducing the heating load of the afterheater.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: The embodiments of this specification first provide an ultra-low dew point rotary dehumidifier, which has an air inlet, an air outlet, and a second air outlet. The air outlet is used to deliver dehumidified ultra-low dew point dry gas to the production workshop. The device includes: a second moisture-absorbing rotary wheel, which has a second moisture-absorbing zone, a cooling zone, and a second regeneration zone. The air outlet of the second regeneration zone is connected to the second air outlet, and the air inlet is connected to the regeneration gas source. A first dry gas flow path is sequentially connected to the air inlet, the second moisture-absorbing zone, and the air outlet. A second dry gas flow path passes through the cooling zone and is connected at its air inlet end to the first dry gas flow path between the air inlet and the air inlet of the second moisture-absorbing zone. Its air outlet end is connected to the first dry gas flow path between the air outlet of the second moisture-absorbing zone and the air outlet.

[0008] To optimize the above plan, the following measures were also taken: In one embodiment, the device includes a post heater, which is disposed on a first dry gas flow path between the outlet of the second moisture absorption zone and the outlet of the second dry gas flow path, or on a first dry gas flow path between the outlet of the second dry gas flow path and the air supply port.

[0009] In one embodiment, the device includes an air supply outlet and a first air exhaust outlet; The device further includes a first moisture-absorbing rotor, which has a first moisture-absorbing zone and a first regeneration zone. The air inlet of the first moisture-absorbing zone is connected to the air supply port and the air outlet is connected to the air inlet port. The air inlet of the first regeneration zone is connected to the air outlet of the second exhaust port and the air outlet of the first regeneration zone is connected to the air outlet of the first exhaust port. The first exhaust port is used to discharge the regenerated gas to the outside. The air supply port supplies fresh air into the first moisture-absorbing rotor.

[0010] As one implementation, it also includes a first surface cooler, and the air inlet, the first surface cooler, and the air inlet of the first moisture absorption zone are connected in sequence via air passages.

[0011] In one implementation, the air outlet and air inlet of the first moisture absorption zone and the air inlet of the second moisture absorption zone are directly connected by a pipe.

[0012] As one implementation, it also includes a second surface cooler, which is disposed on the first dry gas flow path between the air inlet and the desiccant zone of the rotary wheel.

[0013] As one implementation, it also includes a first regeneration heater, and the second regeneration zone air outlet, the first regeneration heater and the first regeneration zone air inlet are sequentially connected by air passages.

[0014] The embodiments of this specification further provide an ultra-low dew point rotary dehumidification system, including a production workshop and the aforementioned ultra-low dew point rotary dehumidification device. The production workshop has a workshop air inlet, a workshop air outlet, and a regenerated air supply outlet. The workshop air inlet is connected to the device air outlet to receive the dehumidified ultra-low dew point dry gas discharged from the device air outlet. The device also includes a second regenerated heater and a CO2 heat pump hot air blower. The regenerated air supply outlet, the CO2 heat pump hot air blower, the second regenerated heater, and the second regeneration zone air inlet are sequentially connected by air paths, and / or the device air outlet, the CO2 heat pump hot air blower, the second regenerated heater, and the second regeneration zone air inlet are sequentially connected by air paths.

[0015] As one implementation, the production workshop also has a return air vent, which is connected to the air inlet of the device.

[0016] As one implementation, the temperature of the ultra-low dew point drying gas in the production workshop is 40-50°C, and the allowable air inlet temperature of the second moisture-absorbing rotor is not lower than 30°C.

[0017] As one implementation, the production workshop is a formation workshop, impregnation workshop, or aging workshop used for post-manufacturing processes of lithium battery cells.

[0018] Because of the above-described solutions, one or more technical solutions provided in this application embodiment have at least the following technical effects or advantages: According to one aspect of the present invention, the rotary dehumidifier has a first drying gas flow path and a second drying gas flow path, wherein the medium gas in the first drying gas flow path is subjected to moisture absorption treatment via a low-temperature second moisture absorption zone, and the medium gas in the second drying gas flow path is subjected to high-temperature drying treatment via a high-temperature cooling zone. The dried gases in the first and second drying gas flow paths converge and mix on the air outlet side of the second moisture absorption rotor, which can increase the air volume and temperature of the supplied dry air, thereby reducing the heating load of the post heater and reducing equipment energy consumption and operating costs.

[0019] According to another aspect of the present invention, in the rotary dehumidification system, the outlet air of the cooling zone of the second moisture-absorbing rotary wheel is no longer supplied as regeneration gas to the second regeneration zone, but is only used to mix with the air at the outlet of the second moisture-absorbing zone to increase the supply air temperature. The regeneration air of the second regeneration zone is directly taken from the low-temperature dry air of the production workshop. After being heated to near the regeneration temperature by the CO2 heat pump hot air blower, it is then heated to the required temperature by the regeneration heater to regenerate the moisture-absorbing rotary wheel. In this way, the regeneration air volume requirement is met, and the advantage of the heat pump in extracting heat from the low-temperature heat source to heat the regeneration air is fully utilized, thereby achieving further energy saving and cost reduction.

[0020] According to another aspect of the present invention, in the rotary dehumidification device and system, the intermediate surface cooler, i.e., the second surface cooler, located between the air inlet and the air inlet of the second moisture absorption zone of the second moisture absorption rotor is eliminated. The air outlet of the first moisture absorption zone of the first moisture absorption rotor, the air inlet of the device, and the air inlet of the second moisture absorption zone of the second moisture absorption rotor are directly connected by a pipeline. The return air outlet of the workshop is connected to the air inlet of the device. In this way, the air from the air outlet of the first moisture absorption zone of the first moisture absorption rotor, which is the first-stage moisture absorption rotor, is mixed with the return air from the workshop and directly enters the moisture absorption zone and cooling zone of the second-stage moisture absorption rotor as the processed air of the second-stage moisture absorption rotor. This avoids the two energy-consuming processes of cooling the air with the intermediate surface cooler and then heating the air at the air outlet of the second-stage moisture absorption rotor by the post-heater in the current process, which occur in a single gas flow path, further reducing energy consumption and power, while simplifying the structure and reducing operating and maintenance costs. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only involve some embodiments of this application and should not be construed as limiting this application.

[0022] Figure 1 This is a schematic diagram of the process flow of the ultra-low dew point rotary dehumidifier in one embodiment of this application. Figure 2 This is a schematic diagram of the process flow of the ultra-low dew point rotary dehumidifier in another embodiment of Embodiment 1 of this application; Figure 3 This is a schematic diagram of the process flow of the ultra-low dew point rotary dehumidifier in Embodiment 2 of this application; Figure 4 This is a schematic diagram of the process flow of the ultra-low dew point rotary dehumidification system in Embodiment 1 of this application; Figure 5 This is a schematic diagram of the process flow of the ultra-low dew point rotary dehumidification system in the first embodiment of this application in Embodiment 2; Figure 6This is a schematic diagram of the process flow of the ultra-low dew point rotary dehumidification system in the second embodiment of this application under the second implementation method; Figure 7 This is a schematic diagram of the process flow of the ultra-low dew point rotary dehumidification system in the third embodiment of this application.

[0023] Figure label: 100. Dehumidification device; 101. Air inlet; 102. Air outlet; 103. Second exhaust outlet; 104. Air supply outlet; 105. First exhaust outlet; 11. First moisture absorption zone; 12. First regeneration zone; 21. Second moisture absorption zone; 22. Cooling zone; 23. Second regeneration zone; 231. Regeneration air inlet flow path; 3. Post-heater; 41. First surface cooler; 42. Second surface cooler; 51. First regeneration heater; 52. Second regeneration heater; 53. CO2 heat pump hot air blower; 6. Processing fan; 7. Regeneration fan; 8. Regeneration makeup air flow path; 300. Dehumidification system; 200. Production workshop; 201. Workshop air inlet; 202. Workshop exhaust outlet; 203. Regeneration air supply outlet; 204. Return air outlet. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings, so as to more clearly understand the purpose, features and advantages of this invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of this invention, but are only for illustrating the essential spirit of the technical solutions of this invention. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0025] Unless the context requires otherwise, throughout the specification and claims, the word “comprising” and its variations, such as “including” and “having”, shall be understood to have an open, inclusive meaning, that is, to be interpreted as “including, but not limited to”.

[0026] Throughout this specification, references to "an embodiment" or "an embodiment" indicate that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Therefore, the appearance of "in an embodiment" or "an embodiment" in various places throughout the specification does not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic may be combined in any manner in one or more embodiments.

[0027] The singular forms “a” and “the” used in this specification and the appended claims include plural references unless otherwise expressly stated herein. It should be noted that the term “or” is generally used to mean “and / or” unless otherwise expressly stated herein.

[0028] In the following description, in order to clearly demonstrate the structure and working method of the present invention, a number of directional terms will be used. However, terms such as "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", and "down" should be understood as convenient terms and not as limiting terms.

[0029] The implementation details of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following content is only for the convenience of understanding the implementation details and is not necessary for implementing this solution.

[0030] This embodiment proposes an ultra-low dew point rotary dehumidifier 100 and a dehumidification system 300, aiming to solve the problem that the dry air temperature after moisture absorption by the dehumidifier rotary dehumidifier is low in existing dehumidifiers and systems, resulting in a large heating load of the post-heater and high equipment operating costs when the workshop air supply temperature requirement is high. It can not only reduce the operating load of the post-heater and reduce equipment energy consumption, but also increase the air supply volume to meet the needs of the workshop.

[0031] The following description, in conjunction with the accompanying drawings, details how the technical solution provided in this embodiment solves the aforementioned technical problems and achieves the corresponding technical effects.

[0032] It should be noted that, in this embodiment, as one scenario, the production workshop 200 in which the ultra-low dew point rotary dehumidifier 100 and dehumidification system 300 are applied can be a formation workshop or impregnation workshop for the post-manufacturing process of lithium battery cells, or any other production workshop that requires ultra-low dew point dry air, such as an aging workshop. As one scenario, the supply air dry air of the production workshop 200 is required to have a dew point temperature > -50℃DP and < -20℃DP, and a supply air temperature ≥ 40℃.

[0033] In this embodiment, the required air supply temperature in the production workshop 200 is 45±5℃, dew point temperature < -25℃DP, and relative humidity ≤ 2%RH. In this embodiment, as one scenario, the ultra-low dew point dry gas output from the device's air outlet 102, i.e., the supply dry air, has a dew point temperature < -45℃DP, fully meeting the needs of the production workshop 200. Of course, in other embodiments, equivalent or approximate modifications can be made to the dehumidification device or system provided in this embodiment to obtain ultra-low dew point dry gases at different dew point temperatures to meet the air supply requirements of different production workshops 200. It should be understood that although the output results may differ, these equivalent or approximate modifications made to the dehumidification device or system provided in this embodiment do not depart from the scope of the invention, and therefore such modifications should also be covered within the scope of protection claimed in this application.

[0034] Example 1 like Figure 1 As shown, this embodiment provides an ultra-low dew point rotary dehumidifier 100, comprising as follows: Figure 1 The components within the dashed box shown are, specifically, an air inlet 101, an air outlet 102, and a second exhaust outlet 103. The air outlet 102 is used to supply dehumidified ultra-low dew point dry gas to the production workshop 200. The device includes a second moisture-absorbing impeller, a first dry gas flow path, and a second dry gas flow path. The second moisture-absorbing impeller has a second moisture-absorbing zone 21, a cooling zone 22, and a second regeneration zone 23. The outlet of the second regeneration zone 23 is connected to the second exhaust outlet 103, and the inlet is connected to the regeneration gas source flow path. The first dry gas flow path sequentially connects the air inlet 101, the second moisture-absorbing zone 21, and the air outlet 102. In one scenario, the air inlet 101 can serve as a fresh air supply outlet, in which case the dehumidification device 100 is based on a single-stage moisture-absorbing impeller. In another scenario, the impeller dehumidification device 100 includes at least two stages of moisture-absorbing impellers, such as... Figure 3 As shown, the air inlet 101 can be connected to the air outlet of the moisture absorption zone of the previous stage moisture absorption impeller. In another case, the air inlet 101 can also be connected to the return air inlet 204 of the production workshop 200. For details, please refer to the following text, which will not be repeated here. The second drying gas flow path passes through the cooling zone 22 and its air inlet end is connected to the first drying gas flow path between the air inlet 101 and the air inlet of the second moisture absorption zone 21. Its air outlet end is connected to the first drying gas flow path between the air outlet of the second moisture absorption zone 21 and the air supply outlet 102.

[0035] like Figure 1As shown, in this embodiment, the air outlet of the second moisture-absorbing rotor cooling zone 22 is not connected to the regeneration air inlet flow path 231 and the air path of the components thereon. The air outlet of the cooling zone 22 is no longer supplied as regeneration gas to the second regeneration zone 23, but is only used to mix with the low-temperature dry air at the air outlet of the second moisture-absorbing zone 21 to increase the air supply temperature. Specifically, the medium gas entering the air inlet 101 of the device is driven by the processing fan 6. Part of it is dried by the first drying gas flow path, that is, after being dried by the second moisture absorption zone 21, it becomes low-temperature dry air to be delivered. The other part is dried by the second drying gas flow path, that is, after being dried by the cooling zone 22, it becomes high-temperature dry air to be delivered. The low-temperature dry air to be delivered and the high-temperature dry air to be delivered are gathered and mixed at the connection between the first and second drying gas flow paths on the air outlet side of the second moisture absorption rotor. Therefore, compared with the prior art, the air volume and temperature of the dry air to be delivered can be increased. If the subsequent heater needs to heat it to the target air delivery temperature, since the dry air to be delivered has been preheated by mixing, the heating load of the subsequent heater can be reduced, thereby reducing the energy consumption and operating cost of the device.

[0036] In one scenario, when the required air supply temperature in production workshop 200 is not high, flow control valves can be installed in the first and second dry gas flow paths to control the flow ratio of the aforementioned high-temperature and low-temperature dry air to be supplied, thereby controlling the temperature of the mixed dry air. Furthermore, a mixing box is installed between the outlet of the second dry gas flow path and the air outlet 102 of the device to ensure uniform mixing of the high and low-temperature dry air, and then the dry air that has reached the target supply temperature and humidity is delivered to production workshop 200.

[0037] As mentioned above, in this embodiment, the device includes a post heater 3. In order to make the temperature distribution of the supplied dry air more uniform, the post heater 3 is set in the first dry gas flow path between the outlet of the second dry gas flow path and the air outlet 102. This can heat the gas after the high temperature and low temperature supplied dry air are mixed. Since the mixed gas has been heated to a temperature close to a certain level compared to the low temperature supplied dry air, the heating load of the post heater 3 can be reduced, and the temperature distribution of the supplied dry air discharged from the post heater 3 is relatively uniform, resulting in higher quality supplied air.

[0038] like Figure 1 and Figure 4As shown, in one scenario, monitoring points L and M are set at the air inlet and outlet of the cooling zone 22 in the second drying gas flow path, respectively; monitoring points H and I are set at the air inlet and outlet of the first moisture absorption zone 11 in the first drying gas flow path, respectively; monitoring point J is set at the first drying gas flow path between the air outlet of the second drying gas flow path and the rear heater 3; and monitoring point K is set at the air outlet 102 between the rear heater 3 and the air outlet 102. The air volume (at 20°C), dry bulb temperature, relative humidity, moisture content, dew point temperature, and enthalpy value at each of the above points are monitored, and the data are shown in the table below: As shown in the table above, most of the medium gas entering the air inlet 101 of the device is dried by the first drying gas flow path, that is, after being humidified by the second moisture absorption zone 21, it becomes low-temperature air to be delivered for drying, as shown in the table. In this embodiment, the air volume of this part of the gas is 27500 m³ / h. 3 / h, at a temperature of 39℃, a small portion is dried via the second drying gas flow path, that is, after high-temperature drying in cooling zone 22, it becomes high-temperature air to be supplied for drying. The airflow of this portion of gas is 2500m³ / h. 3 / h, at a temperature of 82℃, after mixing, the airflow of the mixed gas at point J on the first dry gas flow path was measured to be 30000 m³ / h. 3 The airflow rate was 42.6℃ / h. It can be seen that compared to the low-temperature air to be dried after only moisture absorption in the desiccation zone, both the temperature and flow rate are improved. Therefore, the heating load of the post-heater 3 can be reduced, equipment energy consumption can be lowered, and the airflow requirements of the 200 cubic meter production workshop can be better met. At point K on the first drying gas flow path, the temperature of the gas heated by the post-heater 3 was measured to be 50℃, the dew point temperature was -47℃DP, and the airflow was 30000 m³ / h. 3 / h, relative humidity 0.05%RH, fully meets the air supply requirements of the 200 production workshop.

[0039] like Figure 2 As shown, in other embodiments, the post-heater 3 can also be located in the first dry gas flow path between the air outlet of the second moisture absorption zone 21 and the air outlet of the second dry gas flow path. In this way, the air outlet of the second moisture absorption zone 21 is first heated by the post-heater 3 to obtain heated dry air to be supplied, and then mixed with the high-temperature dry air to be supplied for a secondary temperature increase. This can also heat the dry air to be supplied to the target supply air temperature. However, since the heating process of the post-heater 3 is before the mixing process of the dry air to be supplied in the first and second dry gas flow paths, it is relatively difficult to control the heating temperature of the dry air in this method, and the uniformity of the temperature distribution may be affected to a certain extent. Technicians can consider this according to the on-site working conditions.

[0040] like Figure 4 As shown, this embodiment proposes an ultra-low dew point rotary dehumidification system 300, comprising as follows: Figure 4 The components within the dashed box are shown. The dehumidification system 300 is based on a single-stage moisture-absorbing rotor. Specifically, it includes a production workshop 200 and the aforementioned ultra-low dew point rotor dehumidification device 100. The production workshop has a workshop air inlet 201, a workshop air outlet 202, and a regenerated air supply outlet 203. The workshop air inlet 201 is connected to the device air outlet 102 to receive the dehumidified ultra-low dew point dry gas discharged from the device air outlet 102. The device also includes a second regenerated heater 52 and a CO2 heat pump hot air blower 53. The regenerated air supply outlet 203, the CO2 heat pump hot air blower 53, the second regenerated heater 52, and the air inlet of the second regeneration zone 23 are sequentially connected by air paths, and / or the device air outlet 102, the CO2 heat pump hot air blower 53, the second regenerated heater 52, and the air inlet of the second regeneration zone 23 are sequentially connected by air paths.

[0041] Specifically, in this embodiment, the air inlet end of the regenerated air inlet flow path 231 is connected to the regenerated air supply port 203 of the production workshop 200, and the other end is connected to the air inlet of the second regeneration zone 23. The CO2 heat pump hot air blower 53 and the second regeneration heater 52 are both installed on the regenerated air inlet flow path 231.

[0042] In this embodiment, in the rotary dehumidification system 300, the air outlet of the second moisture-absorbing rotary cooling zone 22 is no longer supplied as regeneration gas to the second regeneration zone 23, but is only used to mix with the air outlet of the second moisture-absorbing zone 21 to increase the supply air temperature. The regeneration air of the second regeneration zone 23 is directly taken from the low-temperature dry air of the production workshop 200. After being heated to near the regeneration temperature by the CO2 heat pump hot air blower 53, it is then heated to the target regeneration temperature by the second regeneration heater 52 to regenerate the second moisture-absorbing rotary. In this way, the regeneration air volume requirement is met, and the advantage of the heat pump in taking heat from the low-temperature heat source to heat the regeneration air is fully utilized, so as to achieve further energy saving and cost reduction.

[0043] In this embodiment, the temperature of the ultra-low dew point dry gas in the production workshop 200 is 40-50°C, the temperature of the inlet gas of the CO2 heat pump hot air blower 53 can be as low as 40°C, and after heating, the temperature of the outlet gas is as low as 120°C. Then, it is further heated to the target regeneration temperature, such as 130°C, by the second regeneration heater 52, and then the moisture-absorbing wheel is regenerated through the second regeneration zone 23.

[0044] Example 2 Based on Embodiment 1, this embodiment sets the dehumidification device 100 or dehumidification system 300 in the form of a two-stage moisture-absorbing rotor to perform moisture absorption and heating treatment on fresh air, so as to further improve the efficiency and effect of gas treatment. The following is a detailed description of the contents of this embodiment with reference to the accompanying drawings.

[0045] refer to Figure 3 , Figures 5 to 7 As shown in this embodiment, the ultra-low dew point rotary dehumidifier 100 further includes an air supply port 104 and a first exhaust port 105. The device further includes a first moisture-absorbing rotary wheel, which has a first moisture-absorbing zone 11 and a first regeneration zone 12. The air inlet of the first moisture-absorbing zone 11 is connected to the air supply port 104 and the air outlet is connected to the air inlet 101. The air inlet of the first regeneration zone 12 is connected to the second exhaust port 103 and the air outlet of the first regeneration zone 12 is connected to the first exhaust port 105. The first exhaust port 105 is used to discharge the water-containing regenerated gas to the outside. The air supply port 104 supplies fresh air into the first moisture-absorbing rotary wheel.

[0046] In this embodiment, by setting up two-stage moisture-absorbing rollers, the first and second moisture-absorbing rollers, compared with a single-stage moisture-absorbing roller, can process fresh air with higher relative humidity and higher water content. The requirements for fresh air entering the device are relatively lower, and ultra-low dew point dry gas with lower dew point temperature, relative humidity and water content can be obtained to meet the needs of production workshop 200.

[0047] In this embodiment, the fresh air is first subjected to a first moisture absorption or drying process through the first moisture absorption zone 11 of the first moisture absorption rotor to compensate for the insufficient moisture absorption or drying capacity of the cooling zone 22 of the second moisture absorption rotor. Then, part of the medium gas enters the cooling zone 22 of the second moisture absorption rotor for drying treatment, ensuring that the medium gas entering the cooling zone 22 of the second moisture absorption rotor can be dried to the required range, thereby ensuring that the temperature and dew point temperature of the supplied dry air can meet the workshop standards.

[0048] In this embodiment, the device further includes a first surface cooler 41. The air supply port 104, the first surface cooler 41, and the air inlet of the first moisture absorption zone 11 are sequentially connected by an air path. The first surface cooler 41 is used to cool the fresh air to the allowable inlet temperature of the first moisture absorption impeller. Specifically, it also includes a filter. The air supply port 104, the filter, the first surface cooler 41, and the air inlet of the first moisture absorption zone 11 are sequentially connected by an air path. The fresh air passes through the filter and the first surface cooler 41 sequentially before entering the first moisture absorption zone 11 for moisture absorption treatment.

[0049] In this embodiment, a second surface cooler 42 is also included, which is disposed in the first dry gas flow path between the air inlet 101 and the second moisture absorption zone 21. When the fresh air passes through the first moisture absorption zone 11 for moisture absorption treatment, heat exchange occurs between it and the first moisture absorption wheel, and the temperature rises. To ensure that the air outlet of the first moisture absorption zone 11 of the first moisture absorption wheel can meet the allowable inlet temperature of the second moisture absorption wheel before entering the second moisture absorption wheel, the second surface cooler 42 is used to cool the air outlet of the first moisture absorption zone 11 that is about to enter the second moisture absorption zone 21, so as to meet the allowable inlet temperature of the second moisture absorption wheel.

[0050] In this embodiment, when the allowable inlet air temperature of the second moisture-absorbing impeller is high, the air outlet and air inlet 101 of the first moisture-absorbing zone 11 and the air inlet of the second moisture-absorbing zone 21 are directly connected by pipes. At this time, the second surface cooler 42 is eliminated, avoiding the two energy-consuming processes of cooling the air by the intermediate surface cooler such as the second surface cooler 42 in this article and then heating the air at the air outlet of the second-stage moisture-absorbing impeller by the post heater 3. This further reduces energy consumption and power, simplifies the structure, and reduces operating and maintenance costs. In one case, the allowable inlet air temperature of the second moisture-absorbing impeller is ≥30℃.

[0051] In this embodiment, as Figure 3 , Figures 5 to 7 As shown, the device also includes a first regeneration heater 51, and the air outlet of the second regeneration zone 23, the first regeneration heater 51, and the air inlet of the first regeneration zone 12 are connected in sequence via air paths. As shown, driven by the regeneration fan 7, regeneration air is output from the regeneration air supply port 203 of the production workshop 200, and is regenerated and heated sequentially through the CO2 heat pump hot air fan 53 and the second regeneration heater 52, and then regenerated through the second regeneration zone 23 to regenerate the second moisture-absorbing rotor. The temperature of the gas output from the air outlet of the second regeneration zone 23 is reduced, and after being heated by the first regeneration heater 51, it enters the first regeneration zone 12 to regenerate the first moisture-absorbing rotor. The regenerated water-containing gas is discharged to the outside. In one embodiment, the device further includes a regeneration air supply path 8, an air outlet of the second regeneration zone 23, a first regeneration heater 51, an air outlet of the regeneration air supply path 8, a regeneration fan 7, and an air inlet of the first regeneration zone 12 connected in sequence by air passages. The regeneration air supply path 8 is used to supply a certain amount of dry air from the outside to mix with the regeneration gas after passing through the second regeneration zone 23. After being heated by the first regeneration heater 51, the mixture enters the first regeneration zone 12 to regenerate the first moisture-absorbing rotor. This can increase the regeneration capacity of the regeneration gas entering the first regeneration zone 12 and optimize the recovery effect of the dehumidification performance of the first moisture-absorbing rotor.

[0052] like Figure 5As shown, this embodiment proposes an ultra-low dew point rotary dehumidification system 300, based on a two-stage moisture-absorbing rotary wheel. The dehumidification system 300 includes a production workshop 200 and the aforementioned ultra-low dew point rotary dehumidification device 100. The production workshop 200 has a workshop air inlet 201, a workshop air outlet 202, and a regenerated air supply outlet 203. The workshop air outlet 202 is used for positive pressure exhaust or process exhaust. The workshop air inlet 201 is connected to the device air outlet 102 to receive the dehumidified ultra-low dew point dry gas discharged from the device air outlet 102. The device also includes a second regenerated heater 52 and a CO2 heat pump hot air blower 53. The regenerated air supply outlet 203, the CO2 heat pump hot air blower 53, the second regenerated heater 52, and the air inlet of the second regeneration zone 23 are sequentially connected by air paths and / or the device air outlet 102, the CO2 heat pump hot air blower 53, the second regenerated heater 52, and the air inlet of the second regeneration zone 23 are sequentially connected by air paths.

[0053] In this dehumidification system 300, on the one hand, the air outlet of the cooling zone 22 of the second moisture absorption rotor is no longer supplied as regeneration gas to the second regeneration zone 23, but is only used to mix with the air outlet of the second moisture absorption zone 21 to increase the supply air temperature. On the other hand, the regeneration air of the second regeneration zone 23 is directly taken from the low-temperature dry air of the production workshop 200. After being heated to near the regeneration temperature by the CO2 heat pump hot air blower 53, it is then heated to the required temperature by the second regeneration heater 52 to regenerate the moisture absorption rotor. Through the synergistic effect of the two aspects, the system can ensure the regeneration air volume of the second regeneration zone 23, and give full play to the characteristics of the CO2 heat pump hot air blower that can operate at low temperature, obtain heat energy at low temperature and have a high outlet air temperature, further reducing the heating load of the second regeneration heater 52 and reducing equipment energy consumption and operating costs.

[0054] In this embodiment, as Figures 6 to 7 As shown, the production workshop also has a return air vent 204, which is connected to the air inlet 101 of the device. This forms a return air flow path between the return air vent 204 and the air inlet 101 of the device. A portion of the dehumidified ultra-low dew point dry gas in the production workshop 200 is mixed with the air outlet of the first moisture absorption zone 11 and enters the second moisture absorption rotor from the air inlet 101 of the device through the first dry gas flow path or the second dry gas flow path. This can greatly reduce the moisture absorption load of the second moisture absorption rotor and help maintain the positive pressure environment in the production workshop 200.

[0055] In this embodiment, after a portion of the dehumidified ultra-low dew point dry gas in the production workshop 200 is mixed with the exhaust air from the first moisture absorption zone 11, the temperature rises, which may not meet the allowable inlet air temperature of the second moisture absorption rotor. Figure 6As shown, in one scenario, a second surface cooler 42 is also included, which is disposed in the first dry gas flow path between the air inlet 101 and the second moisture absorption zone 21. When the fresh air passes through the first moisture absorption zone 11 for moisture absorption, heat exchange occurs between it and the first moisture absorption wheel, causing the temperature to rise. To ensure that the air outlet of the first moisture absorption zone 11 of the first moisture absorption wheel meets the allowable inlet temperature of the second moisture absorption wheel before entering the second moisture absorption wheel, the second surface cooler 42 is used to cool the air outlet of the first moisture absorption zone 11 before it enters the second moisture absorption wheel, thereby meeting the allowable inlet temperature of the second moisture absorption wheel.

[0056] In the above embodiment, in the first dry gas flow path, the air inlet of the second moisture absorption zone 21 is first cooled down by the second surface cooler 42, and after being treated by moisture absorption in the second moisture absorption zone 21, it is heated up by the post heater 3. This results in two energy-consuming processes with completely opposite actions in one gas flow path, which obviously increases the energy consumption of the system unreasonably.

[0057] Therefore, such as Figure 7 As shown, in this embodiment, the second surface cooler 42 is omitted, and a second moisture-absorbing impeller that allows for a higher inlet air temperature is adopted. In this embodiment, the second moisture-absorbing impeller allows an inlet air temperature ≥30℃. Thus, a portion of the dehumidified ultra-low dew point dry gas in the production workshop 200 mixes with the outlet air from the first moisture-absorbing zone 11 and directly enters the second moisture-absorbing impeller from the device inlet 101 via the first or second dry gas flow path for drying. The high and low temperature air to be supplied for drying, output from the first or second dry gas flow path, is heated by the post-heater 3 and then sent into the production workshop 200. This avoids two completely opposite energy-consuming processes occurring on a single gas flow path, reducing system energy consumption.

[0058] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or basic characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects. The scope of the invention is defined by the appended claims rather than the foregoing description. Therefore, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0059] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An ultra-low dew point rotary dehumidifying device having an air inlet, an air outlet, and a second air outlet, the air outlet being used to deliver an ultra-low dew point dry gas that has been dehumidified to a production workshop, characterized in that, The device comprises: The second dehumidification runner is provided with a second dehumidification area, a cooling area and a second regeneration area, the air outlet of the second regeneration area is connected with the second air outlet in air path, and the air inlet is connected with the regeneration gas source in air path; The first dry gas flow path is connected with the air inlet, the second dehumidification area and the air outlet in sequence; The second dry gas flow path is connected with the air inlet and the air outlet of the second dehumidification area in air path through the cooling area, and the outlet end is connected with the first dry gas flow path between the air outlet of the second dehumidification area and the air outlet in air path.

2. The ultra-low dew point rotary dehumidification device according to claim 1, characterized in that, The device is provided with a post-heater, which is arranged on the first dry gas flow path between the air outlet of the second dehumidification area and the outlet end of the second dry gas flow path, or arranged on the first dry gas flow path between the outlet end of the second dry gas flow path and the air outlet.

3. The ultra-low dew point rotary dehumidification device according to claim 1, characterized in that, The device is provided with an air supply outlet and a first air outlet; The device further comprises a first dehumidification runner, which is provided with a first dehumidification area and a first regeneration area, the air inlet of the first dehumidification area is connected with the air supply outlet in air path, and the air outlet is connected with the air inlet in air path, the air inlet of the first regeneration area is connected with the second air outlet in air path, and the air outlet of the first regeneration area is connected with the first air outlet in air path, the first air outlet is used for discharging the regeneration gas to the outside, and the air supply outlet is used for supplying fresh air into the first dehumidification runner.

4. The ultra-low dew point rotary dehumidification device according to claim 3, characterized in that, Further comprising a first surface cooler, the air supply outlet, the first surface cooler and the air inlet of the first dehumidification area are connected in sequence in air path.

5. The ultra-low dew point rotary dehumidification device according to claim 4, characterized in that, The air outlet of the first dehumidification area, the air inlet and the air inlet of the second dehumidification area are directly connected through a pipeline.

6. The ultra-low dew point rotary dehumidification device according to claim 4, characterized in that, Further comprising a second surface cooler, which is arranged on the first dry gas flow path between the air inlet and the dehumidification area of the runner.

7. The ultra-low dew point rotary dehumidification device according to any one of claims 3 to 5, characterized in that, Further comprising a first regeneration heater, the air outlet of the second regeneration area, the first regeneration heater and the air inlet of the first regeneration area are connected in sequence in air path.

8. An ultra-low dew point rotary dehumidification system characterized by, The device further comprises a second regeneration heater and a CO2 heat pump air heater, the regeneration air supply outlet, the CO2 heat pump air heater, the second regeneration heater and the air inlet of the second regeneration area are connected in sequence in air path, and / or the device air outlet, the CO2 heat pump air heater, the second regeneration heater and the air inlet of the second regeneration area are connected in sequence in air path. The production workshop is further provided with an air return outlet, which is connected with the air inlet of the device in air path.

9. The ultra-low dew point rotary dehumidification system of claim 8, wherein, The temperature of the ultra-low dew point dry gas in the production workshop is 40-50 ℃, and the allowable air inlet temperature of the second dehumidification runner is not lower than 30 ℃.

10. The ultra-low dew point rotary dehumidification system of claim 8, wherein, The production workshop is a formation workshop or a soaking workshop or an aging workshop used for post-process of lithium battery cell manufacturing.

11. The ultra-low dew point rotary dehumidification system of claim 10, wherein, ​

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