Energy-saving low-dew-point rotating wheel dehumidification system

Abstract

The utility model provides an energy-saving low-dew-point rotating wheel dehumidification system which comprises a first-stage rotating wheel treatment air section, a second-stage rotating wheel treatment air section and a regeneration air section. The second-stage rotating wheel treatment air section is located on an air outlet path of the first-stage rotating wheel treatment air section; an air taking opening is formed between the processing fan of the first-stage rotating wheel processing air section and the middle surface air cooler of the second-stage rotating wheel processing air section; the air outlet path of the air taking opening comprises the regeneration air section. By means of the structure that air is taken between the processing fan and the middle surface air cooler, the process that regeneration air passing through the regeneration air section needs to be cooled and then heated can be avoided, and energy waste is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a rotating wheel dehumidification technical field, especially a kind of energy-saving low dew point rotating wheel dehumidification system. BACKGROUND

[0002] To meet the dual requirements of carbon peak and carbon neutral, lithium-ion batteries, as an important component of clean energy, play a crucial role in power, energy storage and consumer electronics, and have important significance for addressing climate change and building a low-carbon society. Therefore, the production and manufacturing process of lithium batteries is particularly critical, and strict environmental conditions need to be controlled to ensure product quality and performance. Due to the very active chemical properties of lithium, it will release hydrogen gas when reacting with water, and this hydrogen gas will burn at a certain temperature, and even molten lithium reacting with water can cause an explosion. Therefore, during the lithium battery manufacturing process, air humidity must be strictly controlled to prevent water vapor from acting as a catalyst, causing the quality and performance of metal lithium batteries exposed to a humid environment to decline, and shortening their storage life. Especially in the sealing and liquid injection process of lithium battery production, the moisture content in the air in the workshop has a direct impact on the quality of the battery. If the air humidity in the workshop is too high, it may cause the battery to swell, leak and other problems after being absorbed by the battery. Therefore, the production workshop needs to maintain a controllable air humidity value. Currently, lithium-ion battery manufacturers' production workshops usually require the dew point temperature to be controlled within the range of -35℃ to -40℃ to ensure the humidity of the production environment. In order to achieve this requirement, a low-dew-point rotary dehumidification system is needed to process the air to reach the required dew point temperature, and then send it into the production environment to ensure the smooth progress of lithium battery production and the stability of product quality.

[0003] Currently, the design of a low dew point rotary dehumidification system in the prior art generally includes three areas, a treatment area, a regeneration area, and a regeneration pre-treatment area. A common dehumidification rotary system can only have a treatment area and a regeneration area, while a low dew point rotary dehumidification system adds a regeneration pre-treatment area to achieve a lower dew point requirement. The design of the regeneration pre-treatment area is to pre-heat and dehumidify the regeneration air to ensure that the air passing through the regeneration area is high-temperature and low-humidity, thereby having sufficient regeneration capacity to dry the air in the treatment area to a lower dew point. In the existing low dew point rotary dehumidification system, the fresh air is first dehumidified by a primary rotary and the temperature is increased. Then, the treated air enters a secondary rotary for further dehumidification. In order to meet the requirement of the secondary rotary area for low-temperature and low-humidity air, a surface cooling section is usually added between the primary rotary and the secondary rotary to reduce the air temperature. However, the regeneration pre-treatment area requires high-temperature and low-humidity air to improve the regeneration capacity. Therefore, in this process, the air after being cooled by the surface cooling section is sent to the regeneration pre-treatment area to be heated and then enters the regeneration heater to be heated again. The air is first cooled by the surface cooling section, then needs to be heated by the regeneration pre-treatment area, and then needs to be heated by the regeneration heater, which causes a great waste of energy in the process of first cooling and then heating. Practical new type content

[0004] In view of the above-mentioned shortcomings of the prior art, the present application provides an energy-saving low dew point rotary dehumidification system to solve the problem of energy waste caused by the need for the regeneration air to be first cooled and then heated in the existing low dew point rotary dehumidification system.

[0005] To achieve the above-mentioned and other related purposes, the first aspect of the present application provides an energy-saving low dew point rotary dehumidification system, comprising: a primary rotary treatment air section, a secondary rotary treatment air section, and a regeneration air section; the secondary rotary treatment air section is located on the air outlet path of the primary rotary treatment air section; wherein a wind taking port is arranged between the treatment air fan of the primary rotary treatment air section and the middle surface cooler of the secondary rotary treatment air section; the air outlet path of the wind taking port includes the regeneration air section.

[0006] In some embodiments of the first aspect of the present application, the primary rotary treatment air section includes a primary filter, a front surface cooler, a primary rotary, and a treatment air fan.

[0007] In some embodiments of the first aspect of the present application, a first dehumidification area and a first regeneration area are arranged on the primary rotary; the outdoor fresh air sequentially passes through the primary filter, the front surface cooler, the first dehumidification area, and the treatment air fan, thereby forming a corresponding treatment air path.

[0008] In some embodiments of the first aspect of the present application, the secondary rotary treatment air section includes a middle surface cooler, a secondary rotary, a heater, and a middle filter.

[0009] In some embodiments of the first aspect of the present application, the secondary rotating wheel is provided with a second dehumidification zone, a preheating dehumidification zone and a second regeneration zone; the process air of the secondary rotating wheel process air section passes through the intermediate air cooler, the second dehumidification zone, the heater and the medium-efficiency filter in sequence, and then the dry air obtained is sent into the drying room.

[0010] In some embodiments of the first aspect of the present application, the regeneration air section comprises a second regeneration heater, a second regeneration fan, a first regeneration heater and a first regeneration fan; the primary rotating wheel process air section is provided with a primary rotating wheel; and the secondary rotating wheel process air section is provided with a secondary rotating wheel.

[0011] In some embodiments of the first aspect of the present application, the regeneration air of the regeneration air section passes through the preheating dehumidification zone of the secondary rotating wheel, the second regeneration heater, the second regeneration zone of the secondary rotating wheel, the second regeneration fan, the first regeneration heater, the first regeneration zone of the primary rotating wheel and the first regeneration fan in sequence, and then is discharged to the outdoor.

[0012] In some embodiments of the first aspect of the present application, a regeneration air supplementing opening is arranged between the second regeneration fan and the first regeneration heater.

[0013] In some embodiments of the first aspect of the present application, the front air cooler is provided with a first adjusting valve; and the first adjusting valve is used for adjusting the water flow of the front air cooler.

[0014] In some embodiments of the first aspect of the present application, the intermediate air cooler is provided with a second adjusting valve; and the second adjusting valve is used for adjusting the water flow of the intermediate air cooler.

[0015] As described above, the energy-saving low-dew-point rotating wheel dehumidification system provided by the present application has the following beneficial effects:

[0016] Compared with the regeneration air treatment process in the prior art in which the air is taken from the intermediate air cooler and then is discharged to the outdoor, the present application can avoid the process of first cooling and then heating, and reduce energy waste. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 Fig. 1 shows a structure schematic diagram of an energy-saving low-dew-point rotating wheel dehumidification system according to an embodiment of the present application.

[0018] ELEMENT NUMBER EXPLANATION

[0019] 1 primary rotating wheel process air section

[0020] 11 primary efficiency filter

[0021] 12 front air cooler

[0022] 121 first regulating valve

[0023] 13 process fan

[0024] 14 first dehumidification zone

[0025] 15 first regeneration zone

[0026] 2 secondary runner process air section

[0027] 21 intermediate air cooler

[0028] 211 second regulating valve

[0029] 22 heater

[0030] 23 medium efficiency filter

[0031] 24 second dehumidification zone

[0032] 25 preheat dehumidification zone

[0033] 26 second regeneration zone

[0034] 3 regeneration air section

[0035] 31 second regeneration heater

[0036] 32 second regeneration fan

[0037] 33 first regeneration heater

[0038] 34 first regeneration fan

[0039] 35 regeneration air make-up port DETAILED DESCRIPTION

[0040] The implementation of the present application will be illustrated by specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present application from the disclosure of the present application.

[0041] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this utility model, should still fall within the scope of the technical content disclosed in this utility model. The following detailed description should not be considered restrictive, and the scope of the embodiments of this application is limited only by the claims of the published patents. The terminology used herein is for describing specific embodiments only and is not intended to limit this application. Spatial terms such as "upper," "lower," "left," "right," "below," "below," "lower part," "above," "upper part," etc., may be used in the text to illustrate the relationship between one element or feature shown in the figures and another element or feature.

[0042] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," and "holding" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0043] Furthermore, as used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context indicates otherwise. It should be further understood that the terms “comprising,” “including,” indicate the presence of the stated feature, operation, element, component, item, kind, and / or group, but do not preclude the presence, occurrence, or addition of one or more other features, operations, elements, components, items, kinds, and / or groups. The terms “or” and “and / or” as used herein are interpreted as inclusive, or mean any one or any combination thereof. Thus, “A, B, or C” or “A, B, and / or C” means “any one of: A; B; C; A and B; A and C; B and C; A, B, and C.” Exceptions to this definition arise only when combinations of elements, functions, or operations are inherently mutually exclusive in some manner.

[0044] This utility model provides an energy-saving low dew point rotary dehumidification system. By taking air from between the processing fan and the intermediate surface cooler, the process of cooling and then heating the air passing through the regeneration section can be avoided, thus reducing energy waste.

[0045] In order to make the utility model purposes, technical scheme and advantages more clearly, through the following examples and combining with the drawings, the further detailed description of the technical scheme in the utility model example is made. It should be understood that the specific examples described herein are only used to explain the utility model, and are not used to limit the utility model.

[0046] As Figure 1 shown, a structure schematic diagram of an energy-saving low-dew-point rotary dehumidification system in the utility model example is shown, comprising: a first-stage rotary dehumidification section 1, a second-stage rotary dehumidification section 2 and a regeneration air section 3; the second-stage rotary dehumidification section 2 is located on the air outlet path of the first-stage rotary dehumidification section 1; wherein a wind taking port is arranged between the handling fan 13 of the first-stage rotary dehumidification section 1 and the middle surface cooler 21 of the second-stage rotary dehumidification section 2 to lead out the regeneration air section 3.

[0047] It should be noted that the wind taking port is arranged between the handling fan 13 and the middle surface cooler 21 to divide the wind sent out by the handling fan 13 of the first-stage rotary dehumidification section 1 into two streams, one of which enters the second-stage rotary dehumidification section 2 and the other of which enters the regeneration air section 3. That is, the air outlet path of the first-stage rotary dehumidification section 1 is divided into two by the wind taking port, one of which is provided with the second-stage rotary dehumidification section 2 and the other of which is provided with the regeneration air section 3.

[0048] In an embodiment, the first-stage rotary dehumidification section 1 comprises a primary filter 11, a front surface cooler 12, a first-stage rotary dehumidifier and a handling fan 13. The front surface cooler 12 is provided with a first adjusting valve 121; the first adjusting valve 121 is used to adjust the water flow of the front surface cooler 12.

[0049] It should be noted that the primary filter 11 is used to filter and treat outdoor fresh air. The filter in the dehumidification system purifies the gas by the action of porous filter material to ensure the air cleanliness of the process workshop or other application places, and is divided into primary filters and medium filters according to the filtering effect. Part of the impurities in the air can be filtered by the primary filter and the medium filter. The primary filter is a simple and basic filter, and the filtering efficiency is less than 90%, mainly including primary plate filters, primary folding filters, primary bag filters and metal mesh regenerative filters.

[0050] The main function of the front surface cooler 12 is to cool and dehumidify the air sent to the process workshop or other production workshops, and the outdoor fresh air is cooled and dehumidified by the front surface cooler to control the temperature and humidity of the supply air, so that the handling air reaches a relatively low temperature and humidity state before entering the next step. The front surface cooler 12 is used to adjust the water flow of the front surface cooler 12 by the first adjusting valve 121 to control the temperature of the front surface cooler 12. The handling fan 13 is used to send air.

[0051] In an embodiment, the primary wheel is provided with a first dehumidification zone 14 and a first regeneration zone 15; the outdoor fresh air sequentially passes through the primary filter 11, the front surface cooler 12, the first dehumidification zone 14 and the handling fan 13, thereby forming a corresponding handling air path.

[0052] It should be noted that the primary wheel is a dehumidification wheel, which is the main component of the wheel dehumidification system. The surface of the dehumidification wheel is coated with a hygroscopic agent, and the surface is provided with a honeycomb-shaped porous channel. By slowly rotating the dehumidification wheel, the moisture in the humid air flowing through the dehumidification wheel can be adsorbed, so as to achieve the purpose of dehumidifying the handling air. In the embodiment, the primary wheel is divided into a first dehumidification zone 14 and a first regeneration zone 15. The handling air first passes through the first dehumidification zone 14, and the moisture therein is adsorbed by the hygroscopic agent on the wheel, so that the humidity of the handling air is reduced. Subsequently, the primary wheel is continuously and slowly rotated to enter the first regeneration zone 15. At this time, the high-temperature regeneration air can dehydrate the hygroscopic medium in the primary wheel and carry away the water vapor with the regeneration air, and then the regeneration air after absorbing the moisture is discharged, thereby playing a role of regenerating the primary wheel, so as to maintain the dehumidification capacity of the wheel.

[0053] Specifically, in the primary wheel handling air section 1, the outdoor fresh air is filtered by the primary filter 11 and then enters the front surface cooler 12 to be cooled to a saturated state (i.e. the temperature is 12℃ and the relative humidity is 95%), and a part of condensed water is precipitated, and the absolute moisture content in the air is reduced. The air coming out of the front surface cooler 12 enters the first dehumidification zone 14 of the primary wheel, and the moisture therein is further dehumidified by the hygroscopic medium of the primary wheel. The handling air coming out of the first dehumidification zone 14 of the primary wheel has a temperature of usually between 18℃ and 25℃ and a relative humidity of between 25% and 40%. The handling air is sent out by the handling fan 13 and is divided into two streams, which are respectively sent to the secondary wheel handling air section 2 and the regeneration air section 3.

[0054] In an embodiment, the secondary wheel handling air section 2 includes a middle surface cooler 21, a secondary wheel, a heater 22 and a medium filter 23. The middle surface cooler 21 is provided with a second adjusting valve 211; the second adjusting valve 211 is used to adjust the water flow of the middle surface cooler 21.

[0055] The intermediate air cooler 21 is used for further dehumidification and cooling treatment of the process air on the out-air path of the first-stage runner process air section 1. The intermediate air cooler 21 is used for adjusting the water flow of the intermediate air cooler 21 through the second adjusting valve 211 to control the temperature of the intermediate air cooler 21. The heater 22 can dry the process air after further dehumidification and cooling. The filtering efficiency of the medium-efficiency filter 23 is between 90% and 95%, and mainly includes medium-efficiency bag filters, glass fiber filters, etc. Compared with the primary-efficiency filter, the medium-efficiency filter has better and more stable filtering effect and longer service life. The use of filters with different efficiencies in combination in the dehumidification system, i.e., the simultaneous use of the primary-efficiency filter and the medium-efficiency filter, can well filter the air to meet the purification requirements to ensure that the dehumidifier can work normally.

[0056] In an embodiment, the second-stage runner is provided with a second dehumidification zone 24, a preheating dehumidification zone 25, and a second regeneration zone 26; the second-stage runner process air section 2 process air sequentially passes through the intermediate air cooler 21, the second dehumidification zone 24, the heater 22, and the medium-efficiency filter 23, and then the obtained dry air is sent into the drying room.

[0057] It should be noted that the second-stage runner is a dehumidification runner, which is provided with a second dehumidification zone 24, a preheating dehumidification zone 25, and a second regeneration zone 26. If the second-stage runner is directly regenerated using fresh air, the humidity will be too high, and thus the low dew point requirement cannot be met. Therefore, in the present embodiment, a part of the process air of the first-stage runner process air section 1 is divided through the air taking port for the regeneration of the second-stage runner, and the process air of the first-stage runner process air section 1 is subjected to drying treatment, which can help to meet the low dew point requirement. The second-stage runner is also provided with the preheating dehumidification zone 25, which can first dehumidify and cool the process air divided from the first-stage runner process air section 1, which is beneficial to meet the low dew point requirement.

[0058] Specifically, the second-stage runner process air section 2 is mainly used for cooling and drying treatment of the process air of the first-stage runner process air section 1, and the obtained dry air is sent into the drying room. The temperature of the process air out of the process air fan 13 of the first-stage runner process air section 1 is usually between 18℃ and 25℃, and if it directly enters the second dehumidification zone 24 of the second-stage runner, it cannot be dehumidified to a low dew point state, and thus needs to be cooled first and then dehumidified in the second-stage runner. Therefore, the process air out of the process air fan 13 of the first-stage runner process air section 1 enters the intermediate air cooler 21 for cooling until the temperature required for dehumidification is reached, and then enters the second dehumidification zone 24 for dehumidification to the required dew point. The dehumidified process air enters the heater 22 to be heated until the required supply air temperature is reached. At this time, the supply air temperature and the dew point of the process air both meet the production requirements, and the dry air obtained by further filtering through the medium-efficiency filter 23 is sent into the drying room.

[0059] In an embodiment, the regeneration air section 3 comprises a second regeneration heater 31, a second regeneration fan 32, a first regeneration heater 33, and a first regeneration fan 34; the first-stage rotary dehumidifier processing air section 1 is provided with a first-stage rotary dehumidifier; and the second-stage rotary dehumidifier processing air section 2 is provided with a second-stage rotary dehumidifier.

[0060] It should be noted that the regeneration air section 3 is used to regenerate the first-stage rotary dehumidifier in the first-stage rotary dehumidifier processing air section 1 and the second-stage rotary dehumidifier in the second-stage rotary dehumidifier processing air section 2, so as to maintain the dehumidifying capacity of the rotary dehumidifiers. Therefore, the first-stage rotary dehumidifier and the second-stage rotary dehumidifier are both located on the air outlet path of the regeneration air section 3. The dehumidifying and regenerating of the rotary dehumidifiers are performed repeatedly, so as to ensure that the dehumidifying system maintains a continuous and stable dehumidifying state.

[0061] The second regeneration heater 31 is used to heat the regeneration air. Only when the air is heated to the required regeneration temperature, the water in the air can be effectively removed. The second regeneration fan 32 sends the regeneration air discharged from the second-stage rotary dehumidifier to the first-stage rotary dehumidifier, and the first regeneration heater 33 heats the regeneration air again. The first regeneration fan 34 is used to send the air.

[0062] In an embodiment, the regeneration air of the regeneration air section 3 sequentially passes through the preheating and dehumidifying zone 25 of the second-stage rotary dehumidifier, the second regeneration heater 31, the second regeneration zone 26 of the second-stage rotary dehumidifier, the second regeneration fan 32, the first regeneration heater 33, the first regeneration zone 15 of the first-stage rotary dehumidifier, and the first regeneration fan 34, and then is discharged to the outdoor.

[0063] In an embodiment, a regeneration air supplement port 35 is arranged between the second regeneration fan 32 and the first regeneration heater 33. The first-stage rotary dehumidifier is divided into a first dehumidifying zone 14 and a first regeneration zone 15, and the second-stage rotary dehumidifier is divided into a second dehumidifying zone 24, a preheating and dehumidifying zone 25, and a second regeneration zone 26. Therefore, the regeneration zone of the first-stage rotary dehumidifier is larger than that of the second-stage rotary dehumidifier, and the first-stage rotary dehumidifier needs more regeneration air than the second-stage rotary dehumidifier. At this time, if only the regeneration air transmitted from the second-stage rotary dehumidifier is not enough, the regeneration air supplement port is arranged after the second regeneration fan 32. Through the regeneration air supplement port, the outdoor fresh air and the regeneration air sent by the second-stage rotary dehumidifier can be mixed to provide the first-stage rotary dehumidifier for use.

[0064] It should be explained that one branch of the processing air of the first-stage rotary dehumidifier processing air section 1 directly enters the preheating and dehumidifying zone 25 of the second-stage rotary dehumidifier, is preheated and predehumidified by the second-stage rotary dehumidifier, becomes relatively dry and high-temperature air, is heated to the required regeneration temperature of the second-stage rotary dehumidifier by the second regeneration heater 31, enters the second regeneration zone 26 of the second-stage rotary dehumidifier, regenerates the second-stage rotary dehumidifier, and is discharged from the second-stage rotary dehumidifier by the second regeneration fan 32.

[0065] Further, the regenerative air from the second regenerative fan 32 and the outdoor fresh air supplemented by the regenerative air supplementing port 35 are mixed to generate regenerative air, which enters the first regenerative heater 33, is heated to the regenerative temperature required by the first-stage rotary wheel, and then enters the first regenerative area 15 of the first-stage rotary wheel. The regenerative air discharged after regeneration of the first-stage rotary wheel is discharged to the outdoor by the first regenerative fan 34.

[0066] It should be noted that, in the low-dew-point rotary wheel dehumidification system of the prior art, the process of the air for regeneration is as follows: the first dehumidification area 14 of the first-stage rotary wheel processing air section 1 dehumidifies the air, and then the air is heated by the processing fan 13 and is discharged, and then the air is cooled by the intermediate air cooler 21 of the second-stage rotary wheel processing air section 2, and then the cooled air is dehumidified and heated in the preheating dehumidification area 25 of the second-stage rotary wheel. It can be seen that, in the prior art, the air undergoes the processes of heating, cooling, and reheating, which obviously causes energy waste.

[0067] In the energy-saving low-dew-point rotary wheel dehumidification system provided in the embodiment, a wind taking port is arranged after the processing fan 13 of the first-stage rotary wheel processing air section 1 and before the intermediate air cooler 21 of the second-stage rotary wheel processing air section 2, so that a part of the air discharged by the processing fan 13 of the first-stage rotary wheel processing air section 1 enters the regenerative air section 3. Specifically, the part of the air is dehumidified and heated in the preheating dehumidification area 25 of the second-stage rotary wheel in the regenerative air section 3, is heated by the second regenerative heater 31, and then enters the second regenerative area 26 of the second-stage rotary wheel, so that the second-stage rotary wheel is regenerated. In this way, the low-dew-point requirement of the regenerative air can be met, the processes of cooling and reheating of the regenerative air are avoided, the heating amount of the second regenerative heater 31 is reduced, and energy consumption and energy waste are reduced.

[0068] It should be noted that the energy-saving low-dew-point rotary wheel dehumidification system provided in the utility model is a hardware system, and any software technology update is not within the protection scope of the utility model. The energy-saving low-dew-point rotary wheel dehumidification system in the utility model can be used alone or in combination with some existing software or program, but the utility model itself does not involve any software technology update.

[0069] In summary, the utility model provides a kind of energy-saving low dew point runner dehumidification system, comprising: primary runner processing wind section, secondary runner processing wind section and regeneration wind section;The secondary runner processing wind section is located on the air outlet path of the primary runner processing wind section;Wherein, between the processing fan of the primary runner processing wind section and the middle surface cooler of the secondary runner processing wind section, a wind intake is provided;The air outlet path of the wind intake includes the regeneration wind section.The utility model can avoid the process that the regeneration wind of regeneration wind section needs to be cooled first and then heated, and reduce energy waste by taking wind between processing fan and middle surface cooler.So, the utility model effectively overcomes the various shortcomings in the prior art and has high industrial utilization value.

[0070] The above embodiments only exemplarily illustrate the principles and effects of the utility model, and are not used to limit the utility model. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the utility model. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical concept disclosed by the utility model should be covered by the claims of the utility model.

Claims

1. An energy efficient low dew point rotary dehumidification system, characterized in that, The application relates to a rotary dehumidifier, which comprises a primary rotary dehumidifier air treatment section (1), a secondary rotary dehumidifier air treatment section (2) and a regeneration air section (3); the secondary rotary dehumidifier air treatment section (2) is located on an air outlet path of the primary rotary dehumidifier air treatment section (1). An air taking opening is arranged between a treatment air fan (13) of the primary rotary dehumidifier air treatment section (1) and a middle surface cooler (21) of the secondary rotary dehumidifier air treatment section (2); an air outlet path of the air taking opening comprises the regeneration air section (3). The primary rotary dehumidifier air treatment section (1) comprises a primary filter (11), a front surface cooler (12), a primary rotary dehumidifier and the treatment air fan (13).

2. The energy efficient low dew point rotary dehumidification system as claimed in claim 1 wherein, The primary rotary dehumidifier is provided with a first dehumidification zone (14) and a first regeneration zone (15); outdoor fresh air sequentially passes through the primary filter (11), the front surface cooler (12), the first dehumidification zone (14) and the treatment air fan (13), thereby forming a corresponding treatment air path.

3. The energy efficient low dew point rotary dehumidification system as claimed in claim 2 wherein, The secondary rotary dehumidifier air treatment section (2) comprises the middle surface cooler (21), a secondary rotary dehumidifier, a heater (22) and a middle filter (23).

4. The energy efficient low dew point rotary dehumidification system as set forth in claim 1, wherein, The secondary rotary dehumidifier is provided with a second dehumidification zone (24), a preheating dehumidification zone (25) and a second regeneration zone (26); treatment air of the secondary rotary dehumidifier air treatment section (2) sequentially passes through the middle surface cooler (21), the second dehumidification zone (24), the heater (22) and the middle filter (23), thereby sending dry air obtained into a drying room.

5. The energy-efficient low dew point rotary dehumidification system of claim 4, wherein, The regeneration air section (3) comprises a second regeneration heater (31), a second regeneration air fan (32), a first regeneration heater (33) and a first regeneration air fan (34); the primary rotary dehumidifier air treatment section (1) is provided with a primary rotary dehumidifier; the secondary rotary dehumidifier air treatment section (2) is provided with a secondary rotary dehumidifier.

6. The energy efficient low dew point rotary dehumidification system as set forth in claim 1, wherein, Regeneration air of the regeneration air section (3) sequentially passes through the preheating dehumidification zone (25) of the secondary rotary dehumidifier, the second regeneration heater (31), the second regeneration zone (26) of the secondary rotary dehumidifier, the second regeneration air fan (32), the first regeneration heater (33), the first regeneration zone (15) of the primary rotary dehumidifier and the first regeneration air fan (34), thereby being discharged to the outdoor.

7. The energy-efficient low dew point rotary dehumidification system of claim 6, wherein, A regeneration air supplement opening (35) is arranged between the second regeneration air fan (32) and the first regeneration heater (33).

8. The energy efficient low dew point rotary dehumidification system as set forth in claim 6, wherein, The front surface cooler (12) is provided with a first adjusting valve (121); the first adjusting valve (121) is used for adjusting water flow of the front surface cooler (12).

9. The energy efficient low dew point rotary dehumidification system as set forth in claim 2, wherein, The middle surface cooler (21) is provided with a second adjusting valve (211); the second adjusting valve (211) is used for adjusting water flow of the middle surface cooler (21).

10. The energy efficient low dew point rotary dehumidification system as set forth in claim 4, wherein, ​

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