A dual-stage cold adsorption drying system

Abstract

This application relates to a dual-stage cold adsorption drying system, comprising: a main air compressor with its outlet connected to a main airflow path and a regeneration airflow path; a main drying tower connected to the end of the main airflow path; a main regenerator disposed on the main airflow path between the main air compressor and the main drying tower; a gas-liquid separator disposed between the main regenerator and the main drying tower; a regeneration drying tower connected to the end of the regeneration airflow path; a regeneration regenerator disposed on the regeneration airflow path between the main air compressor and the regeneration drying tower; and a regeneration air compressor disposed between the regeneration regenerator and the regeneration drying tower. The system utilizes the heat of compression of the air compressor to prepare the drying gas and utilizes the regeneration drying tower to regenerate the adsorbent. Furthermore, no additional gas is consumed during the drying and regeneration processes, saving gas energy, improving gas utilization, and reducing operating costs.

Description

Technical Field

[0001] This application relates to the field of compressed air technology, and in particular to a dual-stage cold adsorption drying system. Background Technology

[0002] With the development of energy-saving technologies, improving energy efficiency and reducing energy consumption have become key issues in the field of compressed air treatment.

[0003] In related technologies, various solutions exist for adsorbent regeneration in air compressor-equipped dryers. Some solutions attempt to utilize the waste heat of the air compressor; however, during the cold blowing stage, a certain amount of compressed air is still consumed, leading to air consumption issues and preventing true zero-air-consumption energy saving. Alternatively, an inefficient regenerator layout results in low waste heat utilization efficiency, hindering complete adsorbent regeneration and impacting the overall performance and economy of the dryer.

[0004] The above methods have problems with cold blowing air consumption, which increases energy consumption and operating costs. In addition, the layout of the regenerator is unreasonable and the waste heat is not fully utilized, which cannot meet the requirements of high efficiency and energy saving. Utility Model Content

[0005] Therefore, it is necessary to provide a dual-stage cold adsorption drying system to address the problems of high energy consumption and inability to meet energy-saving requirements of existing dryers.

[0006] A dual-stage cold adsorption drying system includes:

[0007] The main air compressor has an outlet connected to both the main airflow path and the regenerated airflow path.

[0008] The main drying tower is connected to the end of the main airflow path;

[0009] The main regenerator is located on the main airflow path between the main air compressor and the main drying tower;

[0010] A gas-liquid separator is installed between the main regenerator and the main drying tower;

[0011] A regeneration drying tower is connected to the end of the regeneration airflow path;

[0012] A regenerator is installed in the regeneration airflow path between the main air compressor and the regeneration drying tower;

[0013] A regenerating air compressor is installed between the regenerating regenerator and the regenerating drying tower.

[0014] In one embodiment, a secondary air compressor is also included, which is disposed on the main airflow path between the main regenerator and the gas-liquid separator; the inlet of the secondary air compressor is connected to the outlet of the main regenerator, and the outlet of the secondary air compressor is connected to the inlet of the gas-liquid separator.

[0015] In one embodiment, a secondary regenerator is further included, which is disposed on the main airflow path between the secondary air compressor and the gas-liquid separator; the inlet of the secondary regenerator is connected to the outlet of the secondary air compressor, and the outlet of the secondary regenerator is connected to the inlet of the gas-liquid separator.

[0016] In one embodiment, a regulating valve is further included, which is disposed between the main airflow path and the regeneration airflow path; the regulating valve inlet is connected to the gas-liquid separator outlet, and the regulating valve outlet is connected to the regeneration drying tower inlet.

[0017] In one embodiment, a first valve is further included, which is disposed on the regeneration gas flow path between the outlet of the regeneration drying tower and the inlet of the auxiliary regenerator; the inlet of the first valve is connected to the outlet of the regeneration drying tower, and the outlet of the first valve is connected to the inlet of the auxiliary regenerator.

[0018] In one embodiment, a second valve is further included, which is disposed on the regeneration airflow path between the regeneration air compressor and the regeneration drying tower; the inlet of the second valve is connected to the outlet of the regeneration air compressor, and the outlet of the second valve is connected to the inlet of the regeneration drying tower.

[0019] In one embodiment, a bypass valve is further included, which is disposed between the first valve and the second valve; the inlet of the bypass valve is connected to the outlet of the first valve, and the outlet of the bypass valve is connected to the inlet of the second valve.

[0020] In one embodiment, steam is introduced into the main regenerator, the auxiliary regenerator, and the regenerator.

[0021] In one embodiment, the main drying tower and the regeneration drying tower are provided with an adsorption layer; the adsorption layer is filled with activated alumina or molecular sieve.

[0022] In one embodiment, a rotor assembly is provided in the compression chamber of the main air compressor and the regenerative air compressor; the rotor assembly is a centrifugal oil-free structure and is connected to the output shaft of the motor via a coupling.

[0023] The aforementioned dual-stage cold adsorption drying system utilizes the heat of compression from an air compressor to prepare the drying gas and a regeneration drying tower to regenerate the adsorbent. Furthermore, no additional gas is consumed during the drying and regeneration processes, saving gas energy, improving gas utilization, and reducing operating costs. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the principle of a dual-stage cold adsorption drying system.

[0025] In the diagram: 10. Main air compressor; 11. Main drying tower; 12. Main regenerator; 13. Gas-liquid separator; 14. Steam inlet;

[0026] 20. Regeneration drying tower; 21. Regeneration regenerator; 22. Regeneration air compressor;

[0027] 30. Auxiliary air compressor; 31. Auxiliary regenerator;

[0028] 40. Control valve; 41. First valve; 42. Second valve; 43. Bypass valve;

[0029] 50. Electric motor. Detailed Implementation

[0030] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0031] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0032] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0034] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0035] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0036] See Figure 1 , Figure 1 A schematic diagram of the principle of a dual-interval cold adsorption drying system according to an embodiment of this application is shown.

[0037] One embodiment of this application provides a dual-stage cold adsorption drying system, including a main air compressor 10, a main drying tower 11, a main regenerator 12, a gas-liquid separator 13, a regeneration drying tower 20, a regeneration regenerator 21, and a regeneration air compressor 22. The regeneration process of the adsorbent is achieved using the heat of compression of the air compressor, while simultaneously ensuring a continuous supply of dry compressed air to the user's gas system.

[0038] In this embodiment, the outlet of the main air compressor 10 is connected to a main airflow path and a regenerated airflow path. The main drying tower 11 is connected to the end of the main airflow path. The main regenerator 12 is disposed on the main airflow path between the main air compressor 10 and the main drying tower 11. The gas-liquid separator 13 is disposed between the main regenerator 12 and the main drying tower 11.

[0039] The regeneration drying tower 20 is connected to the end of the regeneration airflow path. The regeneration regenerator 21 is disposed on the regeneration airflow path between the main air compressor 10 and the regeneration drying tower 20. The regeneration air compressor 22 is disposed between the regeneration regenerator 21 and the regeneration drying tower 20.

[0040] The main air compressor 10 is the power source of the entire system, responsible for compressing outside air to produce high-pressure compressed air. The outlet of the main air compressor 10 is connected to two airflow paths: a main airflow path and a regeneration airflow path. The main airflow path is used to deliver compressed air to be dried to the main drying tower 11, while the regeneration airflow path is used to deliver gas for desiccant regeneration to the regeneration drying tower 20.

[0041] The main drying tower 11 is connected to the end of the main airflow path and is filled with an adsorbent, such as activated alumina or molecular sieves. When compressed air enters the main drying tower 11, the adsorbent adsorbs moisture from the air, thus drying the compressed air. The dried compressed air is then delivered to the user's gas system to meet the user's demand for dried compressed air.

[0042] The main regenerator 12 is located in the main airflow path between the main air compressor 10 and the main drying tower 11. The main function of the main regenerator 12 is to perform preliminary cooling on the high-temperature compressed air discharged from the main air compressor 10, recover some heat, and at the same time reduce the temperature of the compressed air entering the main drying tower 11, so as to avoid damage to the adsorbent by high temperature and ensure the normal adsorption performance of the adsorbent.

[0043] The gas-liquid separator 13 is located between the main regenerator 12 and the main drying tower 11. The compressed air cooled by the main regenerator 12 still contains a small amount of liquid water. The gas-liquid separator 13 can separate this liquid water from the compressed air, preventing the liquid water from entering the main drying tower 11, protecting the adsorbent from being soaked in liquid water and thus preventing it from becoming ineffective, and extending the service life of the adsorbent.

[0044] The regeneration drying tower 20 is connected to the end of the regeneration gas flow path, and its interior is also filled with adsorbent. Unlike the main drying tower 11, the regeneration drying tower 20 is mainly used to regenerate the adsorbent during system operation to restore its adsorption capacity.

[0045] The regenerator 21 is installed in the regeneration gas flow path between the main air compressor 10 and the regeneration drying tower 20. The function of the regenerator 21 is to cool the regeneration gas entering the main air compressor 10, but the temperature of the regeneration gas is higher than the temperature of the gas cooled by the main regenerator 12.

[0046] The regenerating air compressor 22 is located between the regenerating regenerator 21 and the regenerating drying tower 20. The function of the regenerating air compressor 22 is to perform secondary compression on the regenerating gas, increase the pressure of the regenerating gas, and ensure that the regenerating gas can smoothly enter the regenerating drying tower 20.

[0047] After the system starts, the main air compressor 10 begins operation, compressing the air and dividing it into two paths. In the main airflow path, the compressed air first enters the main regenerator 12 for cooling. Then, the compressed air enters the gas-liquid separator 13, where liquid moisture and impurities are separated. The dried, low-temperature compressed air enters the main drying tower 11, where the adsorbent adsorbs the moisture in the air, bringing the compressed air to the required degree of dryness. Finally, the dried compressed air is delivered to the user's gas supply system through the outlet pipe of the main drying tower 11.

[0048] In the regeneration gas flow path, the high-temperature compressed air discharged from the main air compressor 10 enters the regeneration regenerator 21, which lowers the temperature of the regeneration gas. However, the temperature of the regeneration gas is higher than that of the compressed gas, so the regeneration gas enters the regeneration air compressor 22, where its pressure is increased before entering the regeneration drying tower 20. The relatively high-temperature, high-pressure regeneration gas decomposes and removes the water adsorbed by the adsorbent in the regeneration drying tower 20, thus regenerating the adsorbent.

[0049] As mentioned above, the dual-stage cold adsorption drying system utilizes the heat of compression from the air compressor to prepare the dry gas and regenerate the adsorbent in the regeneration drying tower 20. Furthermore, it consumes no gas during the heating and cold blowing processes, saving energy, improving efficiency, and reducing costs.

[0050] The main regenerator 12 can be a plate heat exchanger or a shell-and-tube heat exchanger, which uses an external cooling medium to exchange heat with the compressed air, reducing the temperature of the compressed air from 100℃-150℃ at the outlet of the main air compressor 10 to 50℃-80℃.

[0051] The switching between the main drying tower 11 and the regeneration drying tower 20 is controlled by the control system, which outputs a 4mA-20mA current signal from the dew point analyzer to the PLC controller for program judgment. The dew point analyzer monitors the dew point of the compressed air at the outlet of the main drying tower 11 in real time, converting the dew point signal into a 4mA-20mA current signal and transmitting it to the PLC. The PLC then performs program judgment based on the preset dew point setpoint.

[0052] If the dew point is higher than the set value, it indicates that the drying effect of the main drying tower 11 is good. At this time, the regeneration drying tower 20 will be in standby mode, extending the drying time until the dew point reaches the set value. Then, the PLC will issue a regeneration drying command to realize the switching between the two towers.

[0053] Combination Figure 1 As shown, Figure 1 This is a schematic diagram of the principle of a dual-interval cold adsorption drying system provided in one embodiment of this application.

[0054] In some embodiments, a secondary air compressor 30 is also included, which is disposed on the main airflow path between the main regenerator 12 and the gas-liquid separator 13; the inlet of the secondary air compressor 30 is connected to the outlet of the main regenerator 12, and the outlet of the secondary air compressor 30 is connected to the inlet of the gas-liquid separator 13.

[0055] Specifically, the auxiliary air compressor 30 is located on the main airflow path between the main regenerator 12 and the gas-liquid separator 13. The inlet of the auxiliary air compressor 30 is connected to the outlet of the main regenerator 12, and the auxiliary air compressor 30 further compresses the compressed air coming out of the main regenerator 12 to increase the air pressure.

[0056] In one embodiment, a secondary regenerator 31 is also included, which is disposed on the main airflow path between the secondary air compressor 30 and the gas-liquid separator 13; the inlet of the secondary regenerator 31 is connected to the outlet of the secondary air compressor 30, and the outlet of the secondary regenerator 31 is connected to the inlet of the gas-liquid separator 13.

[0057] Specifically, the auxiliary regenerator 31 is located on the main airflow path between the auxiliary air compressor 30 and the gas-liquid separator 13. The inlet of the auxiliary regenerator 31 is connected to the outlet of the auxiliary air compressor 30, and the outlet of the auxiliary regenerator 31 is connected to the inlet of the gas-liquid separator 13. The auxiliary regenerator 31 can further regulate the heat of the gas compressed by the auxiliary air compressor 30 to achieve a rapid cooling effect.

[0058] Combination Figure 1 As shown, Figure 1 This is a schematic diagram of the principle of a dual-interval cold adsorption drying system provided in one embodiment of this application.

[0059] In some embodiments, a regulating valve 40 is further included, which is disposed between the main airflow path and the regeneration airflow path; the inlet of the regulating valve 40 is connected to the outlet of the gas-liquid separator 13, and the outlet of the regulating valve 40 is connected to the inlet of the regeneration drying tower 20.

[0060] Specifically, the regulating valve 40 is located between the main airflow path and the regeneration airflow path. The inlet of the regulating valve 40 is connected to the outlet of the gas-liquid separator 13, and the outlet of the regulating valve 40 is connected to the inlet of the regeneration drying tower 20. The regulating valve 40 is used to control the flow rate and opening time of the low-temperature gas introduced into the regeneration drying tower 20 from the main airflow path, so as to achieve precise control of the adsorbent cooling process in the regeneration drying tower 20.

[0061] After heating and regeneration are complete, regulating valve 40 opens, introducing the low-temperature gas, cooled by the main regenerator 12 and auxiliary regenerator 31, into the regeneration drying tower 20 via the main gas flow path. The low-temperature gas is blown into the regeneration drying tower 20 to cool the adsorbent after high-temperature adsorption regeneration, restoring it to a suitable adsorption temperature and preparing it for the next drying cycle. The entire regeneration process consumes no additional gas, saving gas energy and achieving highly efficient energy utilization.

[0062] In one embodiment, a first valve 41 is further included, which is disposed on the regeneration gas flow path between the outlet of the regeneration drying tower 20 and the inlet of the auxiliary regenerator 31; the inlet of the first valve 41 is connected to the outlet of the regeneration drying tower 20, and the outlet of the first valve 41 is connected to the inlet of the auxiliary regenerator 31.

[0063] Specifically, the first valve 41 is located on the regeneration gas flow path between the outlet of the regeneration drying tower 20 and the inlet of the secondary regenerator 31. The inlet of the first valve 41 is connected to the outlet of the regeneration drying tower 20, and the outlet of the first valve 41 is connected to the inlet of the secondary regenerator 31. The first valve 41 is used to control the flow rate and opening time of the gas discharged from the regeneration drying tower 20 into the secondary regenerator 31.

[0064] The high-temperature gas discharged from the regeneration drying tower 20 enters the first valve 41. By adjusting the opening degree of the first valve 41, the flow rate of the high-temperature gas entering the auxiliary regenerator 31 is controlled. After entering the auxiliary regenerator 31, the high-temperature gas is cooled down, then enters the gas-liquid separator 13 to remove liquid water, and then enters the main drying tower 11 for drying, realizing the recovery and utilization of gas and improving the energy utilization efficiency of the system.

[0065] In one embodiment, a second valve 42 is also included, which is disposed on the regeneration airflow path between the regeneration air compressor 22 and the regeneration drying tower 20; the inlet of the second valve 42 is connected to the outlet of the regeneration air compressor 22, and the outlet of the second valve 42 is connected to the inlet of the regeneration drying tower 20.

[0066] Specifically, the second valve 42 is installed on the regeneration airflow path between the regeneration air compressor 22 and the regeneration drying tower 20. The inlet of the second valve 42 is connected to the outlet of the regeneration air compressor 22, and the outlet of the second valve 42 is connected to the inlet of the regeneration drying tower 20. The second valve 42 is used to control the flow rate and opening time of the regeneration gas entering the regeneration drying tower 20 from the regeneration air compressor 22. When the second valve 42 is open, the high-temperature and high-pressure regeneration gas enters the regeneration drying tower 20 through the second valve 42, heating the adsorbent inside the regeneration drying tower 20 and causing the adsorbed moisture to desorb out.

[0067] In one embodiment, a bypass valve 43 is also included, which is disposed between the first valve 41 and the second valve 42; the inlet of the bypass valve 43 is connected to the outlet of the first valve 41, and the outlet of the bypass valve 43 is connected to the inlet of the second valve 42.

[0068] Specifically, bypass valve 43 is installed on the regeneration gas flow path between the first valve 41 and the second valve 42. The inlet of bypass valve 43 is connected to the outlet of the first valve 41, and the outlet of bypass valve 43 is connected to the inlet of the second valve 42. The function of bypass valve 43 is that when bypass valve 43 is open, a portion of the gas discharged from the regeneration drying tower 20 bypasses the auxiliary regenerator 31 and directly returns to the path between the regeneration air compressor 22 and the regeneration drying tower 20, thus achieving flexible adjustment of the regeneration gas flow path. Bypass valve 43 enables the mixing of high-temperature, high-pressure gas with the gas regenerated by adsorption and regeneration through the adsorbent, improving gas utilization.

[0069] In one embodiment, steam is introduced into the main regenerator 12, the secondary regenerator 31, and the regenerator 21.

[0070] Specifically, the main regenerator 12 has a steam passage inside, and steam enters the steam passage through the steam inlet 14. The steam exchanges heat with the compressed air inside the main regenerator 12. The main regenerator 12 is primarily used to absorb some of the heat from the gas discharged from the main air compressor 10. When steam enters the main regenerator 12, the steam absorbs heat from the compressed air and heats up, while the compressed air is cooled, achieving a cooling effect. The gas-steam exchange process in the auxiliary regenerator 31 and the regenerator 21 is the same as that in the main regenerator 12, and will not be described in detail here.

[0071] In one embodiment, a rotor assembly is provided in the compression chamber of the main air compressor 10 and the regenerative air compressor 22; the rotor assembly is a centrifugal oil-free structure and is connected to the output shaft of the motor 50 via a coupling.

[0072] Specifically, the main air compressor 10 has a rotor assembly in its compression chamber. This rotor assembly is a centrifugal oil-free structure and is connected to the output shaft of the motor 50 via a coupling. This avoids the contamination of compressed air by lubricating oil during the compression process and improves compression efficiency and reliability.

[0073] The coupling uses a flexible coupling or a diaphragm coupling, which has good shock absorption and buffering performance. The electric motor 50 provides power to the air compressor, and its power is selected according to the compressed air demand of the system. A variable frequency electric motor 50 is used to reduce energy consumption.

[0074] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A dual-stage cold adsorption drying system, characterized in that, include: The main air compressor (10) has an outlet connected to the main airflow path and the regeneration airflow path; The main drying tower (11) is connected to the end of the main airflow path; The main regenerator (12) is located on the main airflow path between the main air compressor (10) and the main drying tower (11); A gas-liquid separator (13) is disposed between the main regenerator (12) and the main drying tower (11); A regeneration drying tower (20) is connected to the end of the regeneration airflow path; A regenerator (21) is installed on the regeneration airflow path between the main air compressor (10) and the regeneration drying tower (20); A regenerated air compressor (22) is located between the regenerated regenerator (21) and the regenerated drying tower (20).

2. The dual-stage cold adsorption drying system according to claim 1, characterized in that, It also includes an auxiliary air compressor (30), which is located on the main airflow path between the main regenerator (12) and the gas-liquid separator (13); the inlet of the auxiliary air compressor (30) is connected to the outlet of the main regenerator (12), and the outlet of the auxiliary air compressor (30) is connected to the inlet of the gas-liquid separator (13).

3. The dual-stage cold adsorption drying system according to claim 2, characterized in that, It also includes a secondary regenerator (31), which is located on the main airflow path between the secondary air compressor (30) and the gas-liquid separator (13); the inlet of the secondary regenerator (31) is connected to the outlet of the secondary air compressor (30), and the outlet of the secondary regenerator (31) is connected to the inlet of the gas-liquid separator (13).

4. The dual-stage cold adsorption drying system according to claim 1, characterized in that, It also includes a regulating valve (40), which is located between the main airflow path and the regeneration airflow path; the inlet of the regulating valve (40) is connected to the outlet of the gas-liquid separator (13), and the outlet of the regulating valve (40) is connected to the inlet of the regeneration drying tower (20).

5. The dual-interval cold adsorption drying system according to claim 3, characterized in that, It also includes a first valve (41), which is disposed on the regeneration airflow path between the outlet of the regeneration drying tower (20) and the inlet of the auxiliary regenerator (31); the inlet of the first valve (41) is connected to the outlet of the regeneration drying tower (20), and the outlet of the first valve (41) is connected to the inlet of the auxiliary regenerator (31).

6. The dual-interval cold adsorption drying system according to claim 5, characterized in that, It also includes a second valve (42), which is located on the regeneration airflow path between the regeneration air compressor (22) and the regeneration drying tower (20); the inlet of the second valve (42) is connected to the outlet of the regeneration air compressor (22), and the outlet of the second valve (42) is connected to the inlet of the regeneration drying tower (20).

7. The dual-interval cold adsorption drying system according to claim 6, characterized in that, It also includes a bypass valve (43), which is disposed between the first valve (41) and the second valve (42); the inlet of the bypass valve (43) is connected to the outlet of the first valve (41), and the outlet of the bypass valve (43) is connected to the inlet of the second valve (42).

8. The dual-interval cold adsorption drying system according to any one of claims 1-7, characterized in that, Steam is introduced into the main regenerator (12), the auxiliary regenerator (31), and the regenerator (21).

9. The dual-interval cold adsorption drying system according to any one of claims 1-7, characterized in that, The main drying tower (11) and the regeneration drying tower (20) are equipped with adsorption layers; the adsorption layers are filled with activated alumina or molecular sieves.

10. The dual-interval cold adsorption drying system according to any one of claims 1-7, characterized in that, The main air compressor (10) and the regenerable air compressor (22) are equipped with rotor assemblies in their compression chambers; the rotor assemblies are centrifugal oil-free structures and are connected to the output shaft of the motor (50) via a coupling.

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