Three-tower thermal regeneration adsorption gas drying system

Abstract

This utility model relates to the technical field of thermal regenerative adsorption gas drying systems, and particularly to a three-tower thermal regenerative adsorption gas drying system. It includes a main cooler, a first adsorption tower, and a second adsorption tower. The inlet end of the main cooler is connected to a gas inlet pipe, and the outlet end of the main cooler is connected to the inlet ends of both the first and second adsorption towers. It also includes a third adsorption tower and a regeneration cooler. The outlet end of the regeneration cooler is connected to the inlet ends of both the first and second adsorption towers, and the inlet end of the regeneration cooler is connected to the inlet end of the third adsorption tower. The outlet end of the main cooler is also connected to a regeneration heater, and the outlet end of the third adsorption tower is connected to the regeneration heater. The outlet ends of the first, second, and third adsorption towers are all connected to gas outlet pipes. Through the above technical solution, this utility model solves the problem that existing thermal regenerative adsorption gas drying systems are not suitable for large flow rates and special gases.

Description

Technical Field

[0001] This utility model relates to a thermal regeneration adsorption gas drying system, specifically a three-tower thermal regeneration adsorption gas drying system. Background Technology

[0002] A thermal regenerative adsorption gas drying system is a device that uses temperature changes to remove moisture from gas. Thermal regenerative adsorption dryers achieve drying effects through temperature changes, as the gas's capacity to hold water vapor is directly proportional to temperature. Internally heated adsorption dryers allow a small amount of drying gas (called regeneration gas) to flow through the desiccant layer to be regenerated and activate the built-in regeneration heater in the barrel. The resulting high-temperature gas draws out the moisture from the desiccant and carries it out of the dryer. Externally heated adsorption dryers use two methods: one involves allowing a small amount of drying gas (called regeneration gas) to flow through an external regeneration heater and then through the desiccant layer to be regenerated; the resulting high-temperature gas draws out the moisture from the desiccant and carries it out of the dryer. The other method uses a blower to blow ordinary gas through an external regeneration heater in the barrel; the resulting high-temperature gas draws out the moisture from the desiccant and carries it out of the dryer.

[0003] Existing thermal regeneration adsorption gas drying systems are devices that utilize temperature changes to achieve gas drying. These systems typically include the following main components:

[0004] Adsorption Towers: This is the core of the system. There are usually two adsorption towers: one for adsorbing moisture and the other for regeneration. The adsorption towers are filled with adsorbents such as molecular sieves and activated alumina. Regeneration Heater: Used to heat the regeneration gas or external gas to generate high-temperature gas to desorb moisture from the adsorbent. Regeneration Gas System: Includes regeneration gas regulating valves and pipelines to control the flow and pressure of the regeneration gas. Cooling System: After the regeneration process, the adsorbent needs to be cooled for re-adsorption. The cooling system typically includes a cooling fan or a cooling water system. Control System: Used to control the operation of the entire drying system, including switching between adsorption and regeneration processes, and controlling temperature and pressure. Gas Source System: Provides compressed gas or other gases that need to be dried. Filtration System: Used to filter the gas entering the system to prevent impurities from entering the adsorption towers. Valves and Pipelines: Used to control the flow and pressure of the gas to ensure the normal operation of the system. The working principle of a thermally regenerating adsorption gas drying system is as follows: During adsorption, humid gas passes through the adsorption tower, and moisture is adsorbed by the adsorbent. During regeneration, high-temperature gas generated by the regeneration heater passes through the adsorption tower, desorbing the moisture from the adsorbent and expelling it from the system, thereby restoring the adsorbent's adsorption capacity.

[0005] When faced with large volumes of gas to be treated, existing adsorption towers are insufficient to complete the task. Moreover, the larger the capacity of the adsorption tower, the more complex its manufacturing process becomes, and the less convenient it is to transport.

[0006] Furthermore, existing thermal regenerative adsorption gas drying systems require direct discharge of gas into the atmosphere, which limits their application to ordinary gases that have no environmental impact, and prevents their application to special gases. Utility Model Content

[0007] To address the problems in related technologies, this invention provides a three-tower thermal regeneration adsorption gas drying system, which solves the problem that existing systems are not suitable for large flow rates and special gases.

[0008] To solve the above problems, the following technical solutions are provided:

[0009] A three-tower thermal regeneration adsorption gas drying system includes a main cooler, a first adsorption tower, and a second adsorption tower. The inlet end of the main cooler is connected to a gas inlet pipe, and the outlet end of the main cooler is connected to the inlet ends of the first and second adsorption towers, respectively. The system is characterized by further including a third adsorption tower and a regeneration cooler. The outlet end of the regeneration cooler is connected to the inlet ends of the first and second adsorption towers, respectively, and the inlet end of the regeneration cooler is connected to the inlet end of the third adsorption tower. The outlet end of the main cooler is also connected to a regeneration heater, and the outlet end of the third adsorption tower is connected to the regeneration heater. The outlet ends of the first, second, and third adsorption towers are all connected to gas outlet pipes. A first temperature detector and a first pressure detector are installed on both the gas outlet pipe and the gas inlet pipe.

[0010] Through the above technical solution, by setting up a third adsorption tower, this system has three adsorption towers: the first, second, and third adsorption towers. The specific working state of each tower can be selected according to production needs. When dealing with large flow rates of gas, after the three adsorption towers adsorb moisture from the gas, one of the adsorption towers can be selected for heating regeneration and cold blowing. This allows the adsorption tower to recover its adsorption capacity while the other two adsorption towers continue to adsorb moisture. The three adsorption towers alternately complete the recovery of adsorption capacity, thus enabling continuous and better processing of large flow rates of gas and ensuring the adsorption effect.

[0011] Since the adsorption capacity of the three adsorption towers can be restored by switching states in this system, there is no need to discharge the gas in the system to the outside. Therefore, this system is suitable for special gases.

[0012] By setting up a first temperature detector and a first pressure detector, temperature and pressure can be detected before the gas enters the system and after it leaves the system, respectively. The states of the first adsorption tower, the second adsorption tower, and the third adsorption tower can be adjusted according to the detection results, thereby improving the adsorption and regeneration effect.

[0013] Furthermore, the gas outlets of the first adsorption tower, the second adsorption tower, and the third adsorption tower are all connected to exhaust pipes, and all three exhaust pipes are connected to the gas outlet pipe.

[0014] Furthermore, the main cooler is connected to the regenerative cooler via a first pipe, the two ends of which are connected to the air outlet of the main cooler and the air inlet of the regenerative cooler, respectively; the regenerative heater is located on the first pipe.

[0015] Furthermore, the inlet ends of the first adsorption tower, the second adsorption tower, and the third adsorption tower are all connected to inlet pipes, and the three inlet pipes are all connected to the first pipe through the second pipe.

[0016] Furthermore, the outlet of the regeneration cooler is connected to a third pipe, and the other end of the third pipe is connected to three fourth pipes, which are respectively connected to the inlet of the first adsorption tower, the second adsorption tower and the third adsorption tower.

[0017] The third pipe has a third temperature detector, and each of the three fourth pipes has a first control valve.

[0018] Furthermore, a fifth pipe is connected to the first pipe, and the fifth pipe is connected to the third pipe. A flow regulating valve is installed on the section of the fifth pipe that is connected to the first pipe and the third pipe.

[0019] Furthermore, the air inlet ends of the first adsorption tower, the second adsorption tower, and the third adsorption tower are all connected to a sixth pipe, and all three sixth pipes are connected to the first pipe. Each of the three sixth pipes has a second control valve.

[0020] Furthermore, a second temperature detector is provided on the first pipe between the regeneration heater and the sixth pipe of the first adsorption tower.

[0021] Furthermore, a third control valve is provided on the section of the first pipe that connects the first pipe to the regeneration heater, and on the section of the first pipe that connects the regeneration cooler to the sixth pipe of the second adsorption tower; a fourth control valve is provided on each of the three fourth pipes.

[0022] Furthermore, a fourth control valve is provided on the section of the second pipe that connects the second pipe to the air inlet pipe of the first adsorption tower, and on the section of the second pipe that connects the second pipe to the fourth pipe of the second adsorption tower. Attached Figure Description

[0023] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0024] Figure 1 This is a connection diagram of the present invention;

[0025] Figure 2 This is a schematic diagram of the third adsorption tower in this utility model;

[0026] Figure 3 This is a schematic diagram of the pipeline in this utility model;

[0027] Figure 4 This is a schematic diagram of the first pipe and the second pipe in this utility model;

[0028] Figure 5 This is a schematic diagram showing the components in a parallel state in this utility model;

[0029] Figure 6 This is a schematic diagram of the first step in the working state of this utility model;

[0030] Figure 7 This is a schematic diagram of the second step in the first working state of this utility model;

[0031] Figure 8 This is a schematic diagram of the first step in the second working state of this utility model;

[0032] Figure 9 This is a schematic diagram of the second step in the second working state of this utility model.

[0033] Explanation of reference numerals in the attached diagram: AD1, first adsorption tower; AD2, second adsorption tower; AD3, third adsorption tower; FCV, flow control valve;

[0034] C1, Main cooler; C2, Regenerative cooler;

[0035] T1, first temperature detector; T2, second temperature detector; T3, third temperature detector; T4, fourth temperature detector;

[0036] P, First pressure detector; E, Regeneration heater;

[0037] D1, First pipe; D2, Second pipe; D3, Third pipe; D4, Fourth pipe; D5, Fifth pipe; D6, Sixth pipe;

[0038] X1, Gas inlet pipe; X2, Gas outlet pipe; Q1, Inlet pipe; Q2, Exhaust pipe;

[0039] K1, first control valve; K2, second control valve; K3, third control valve; K4, fourth control valve; K5, fifth control valve. Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0041] To facilitate understanding of this plan, the following explanations are provided for the technical terms used in this plan:

[0042] Adsorption tower: A tower-shaped container filled with adsorbent.

[0043] Regeneration refers to the process of removing the adsorbate from the micropores of the adsorbent using a certain method without causing or with minimal changes to the structure of the adsorbent itself, thereby enabling the saturated adsorbent to be reused. In this specific embodiment, an electric heater is used to heat compressed air to carry sufficient heat to regenerate the adsorbent.

[0044] Heat of compression: During the operation of an air compressor, the gas volume is compressed, the distance between molecules decreases, the interaction between them intensifies, collisions increase, and the kinetic energy of the gas molecules increases, which is released as heat. This portion of heat is called the heat of compression.

[0045] In a specific embodiment, such as Figure 1-9As shown, the three-tower thermal regeneration adsorption gas drying system includes a main cooler C1, a first adsorption tower AD1, and a second adsorption tower AD2. The inlet of the main cooler C1 is connected to a gas inlet pipe X1, and the outlet of the main cooler C1 is connected to the inlets of both the first and second adsorption towers AD1 and AD2. The outlet of the main cooler C1 is also connected to a regeneration heater E. The three-tower thermal regeneration adsorption gas drying system also includes a third adsorption tower AD3 and a regeneration cooler C2. The outlet of the regeneration cooler C2 is connected to the inlets of both the first and second adsorption towers AD1 and AD2. The inlet ends of adsorption tower AD1 and the second adsorption tower AD2 are connected. The inlet end of regeneration cooler C2 is connected to the inlet end of the third adsorption tower AD3. The outlet end of the third adsorption tower AD3 is connected to the regeneration heater E. The outlet ends of the first adsorption tower AD1, the second adsorption tower AD2 and the third adsorption tower AD3 are all connected to a gas outlet pipe X2. The gas outlet pipe X2 and the gas inlet pipe X1 are both equipped with a first temperature detector T1 and a first pressure detector P. The structures of the first adsorption tower AD1, the second adsorption tower AD2 and the third adsorption tower AD3 are identical.

[0046] In addition to the adsorption state, the three adsorption towers in this system also have two other working states: heating regeneration state and cold blowing state.

[0047] The three adsorption towers in this system have three combination states, and each combination state has three working modes Z1, Z2, and Z3.

[0048] Combination 1:

[0049] Z1 working mode: The first adsorption tower AD1, the second adsorption tower AD2, and the third adsorption tower AD3 are all in the adsorption state;

[0050] Z2 working mode: The first adsorption tower AD1 and the second adsorption tower AD2 are both in the adsorption state, and the third adsorption tower AD3 is in the heating and regeneration state.

[0051] Z3 working mode: The first adsorption tower AD1 and the second adsorption tower AD2 are both in the adsorption state, and the third adsorption tower AD3 is in the cold blowing state.

[0052] Combination 2:

[0053] Z1 working mode: The first adsorption tower AD1, the second adsorption tower AD2, and the third adsorption tower AD3 are all in the adsorption state;

[0054] Z2 working mode: The first adsorption tower AD1 and the third adsorption tower AD3 are both in the adsorption state, and the second adsorption tower AD2 is in the heating and regeneration state.

[0055] Z3 working mode: The first adsorption tower AD1 and the third adsorption tower AD3 are both in the adsorption state, and the second adsorption tower AD2 is in the cold blowing state.

[0056] Combination 2:

[0057] Z1 working mode: The first adsorption tower AD1, the second adsorption tower AD2, and the third adsorption tower AD3 are all in the adsorption state;

[0058] Z2 working mode: The second adsorption tower AD2 and the third adsorption tower AD3 are both in the adsorption state, and the first adsorption tower AD1 is in the heating and regeneration state.

[0059] Z3 operating mode: The second adsorption tower AD2 and the third adsorption tower AD3 are both in the adsorption state, while the first adsorption tower AD1 is in the cold blowing state.

[0060] In this specific embodiment, the system uses combination two.

[0061] The first adsorption tower AD1, the second adsorption tower AD2, and the third adsorption tower AD3 are all equipped with adsorbents for adsorbing moisture in the gas. In this specific embodiment, activated alumina is selected as the adsorbent for the adsorption towers. The specific structure and composition of the first adsorption tower AD1, the second adsorption tower AD2, and the third adsorption tower AD3 are all prior art. For details, please refer to the patent application number CN200710133458.4.

[0062] This system has three adsorption towers: AD1 (first adsorption tower), AD2 (second adsorption tower), and AD3 (third adsorption tower). The system allows for selection of which tower is in which operating state based on production needs. When dealing with large flow rates of gas, after the three towers adsorb moisture, one tower can be selected for heating regeneration and cold blowing. This allows the adsorption tower to recover its adsorption capacity while the other two towers continue adsorbing moisture. The three towers alternately complete the recovery of their adsorption capacity, thus enabling continuous and better processing of large flow rates of gas and ensuring effective adsorption.

[0063] Since the adsorption capacity of the three adsorption towers can be restored by switching states in this system, there is no need to discharge the gas in the system. Therefore, this system is suitable for special gases (such as gases containing corrosive components, high humidity gases, or gases with low dew point requirements).

[0064] The outlets of the first adsorption tower AD1, the second adsorption tower AD2, and the third adsorption tower AD3 are all connected to exhaust pipes Q2, and all three exhaust pipes Q2 are connected to the gas outlet pipe X2.

[0065] The main cooler C1 is connected to the regenerative cooler C2 through the first pipe D1. The two ends of the first pipe D1 are connected to the air outlet of the main cooler C1 and the air inlet of the regenerative cooler C2, respectively. The regenerative heater E is located on the first pipe D1.

[0066] The air inlets of the first adsorption tower AD1, the second adsorption tower AD2, and the third adsorption tower AD3 are all connected to air inlet pipes Q1, and the three air inlet pipes Q1 are all connected to the first pipe D1 through the second pipe D2.

[0067] like Figure 1 and Figure 3 As shown, the outlet of the regenerator C2 is connected to a third pipe D3, and the other end of the third pipe D3 is connected to three fourth pipes D4, which are respectively connected to the inlet of the first adsorption tower AD1, the second adsorption tower AD2 and the third adsorption tower AD3.

[0068] The third temperature detector T3 is located on the third pipe D3, and the first control valve K1 is located on each of the three fourth pipes D4.

[0069] like Figure 1 and Figure 3 As shown, the first pipe D1 is connected to the fifth pipe D5, and the fifth pipe D5 is connected to the third pipe D3. The section of the fifth pipe D5 that is connected to the first pipe D1 and the third pipe D3 has a flow regulator FCV.

[0070] like Figure 1-2 As shown, the air inlet ends of the first adsorption tower AD1, the second adsorption tower AD2, and the third adsorption tower AD3 are all connected to a sixth pipe D6. All three sixth pipes D6 are connected to the first pipe D1, and each of the three sixth pipes D6 has a second control valve K2.

[0071] like Figure 1 and Figure 4 As shown, a second temperature detector T2 is located on the first pipe D1 between the regeneration heater E and the sixth pipe D6 of the first adsorption tower AD1.

[0072] like Figure 1 and Figure 3 As shown, there is a third control valve K3 on the section of the first pipe D1 that connects to the regeneration heater E, and on the section of the first pipe D1 between the regeneration cooler C2 and the sixth pipe D6 of the second adsorption tower AD2; and there is a fourth control valve K4 on each of the three fourth pipes D4.

[0073] There is a fourth control valve K4 on the section of the second pipe D2 that connects to the air inlet pipe Q1 of the first adsorption tower AD1, and on the section of the second pipe D2 that connects to the fourth pipe D4 of the second adsorption tower AD2.

[0074] Operation process: The system has a parallel state, such as Figure 5 As shown, parallel state means that the first adsorption tower, the second adsorption tower, and the third adsorption tower are all in the adsorption state;

[0075] When the second adsorption tower AD2 is in working state one, such as Figure 6-7 As shown; Working status - Step 1, as follows Figure 6 As shown: All control valves K1, K2, K3, and K4 are closed. The raw material gas enters the main cooler C1 through the gas inlet pipe P1. The third control valve K3 on the section of the first pipe D1 connecting the main cooler C1 and the regeneration heater E is opened, and the flow regulating valve FCV is closed. After exiting the main cooler C1, the gas enters the regeneration heater E through the first pipe D1 for heating. At this time, the second control valve K2 on the sixth pipe D6 of the second adsorption tower AD2 is opened, and the heated high-temperature gas continues to... The gas enters the second adsorption tower AD2 through the first pipe D1 and the sixth pipe D6 of the second adsorption tower AD2. The high temperature gas can quickly restore the adsorption function of the adsorbent in the second adsorption tower AD2, realizing the rapid regeneration function of the second adsorption tower AD2. After completion, the flow regulating valve FCV is opened, and the first control valve K1 on the inlet pipe Q1 of the second adsorption tower AD2 is opened. The gas enters the first pipe D1 through the inlet pipe Q1 of the second adsorption tower AD2, and enters the regeneration cooler C2 along the first pipe D1 for cooling. The cooled gas enters the third pipe D3.

[0076] Working status, step two, such as Figure 7 As shown: Open the flow regulating valve FCV, open the fifth control valve K5 on the fourth pipe D4 of the first adsorption tower AD1, and the gas enters the first adsorption tower AD1 from the third pipe D3 through the inlet pipe Q1. The adsorbent in the first adsorption tower AD1 adsorbs the moisture and impurities in the gas. After adsorption, the gas enters the gas outlet pipe P2 through the exhaust pipe Q2 of the first adsorption tower AD1 and is discharged. Open the fifth control valve K5 on the fourth pipe D4 of the third adsorption tower AD3, and the gas enters the third adsorption tower AD3 from the third pipe D3 through the inlet pipe Q1. The adsorbent in the third adsorption tower AD3 adsorbs the moisture and impurities in the gas. After adsorption, the gas enters the gas outlet pipe P2 through the exhaust pipe Q2 of the third adsorption tower AD3 and is discharged.

[0077] When the second adsorption tower AD2 is in working state two, such as Figure 8-9 As shown, the first step of working state two is as follows: Figure 8As shown: All first control valves K1, second control valve K2, third control valve K3, and fourth control valve K4 are closed. The flow regulating valve FCV is closed. The raw material gas enters the main cooler C1 through the gas inlet pipe P1. The fourth control valve K4 on the second pipe D2, which connects the first pipe D1 and the inlet pipe Q1 of the first adsorption tower AD1, is opened. The first control valve K1 on the inlet pipe Q1 of the second adsorption tower AD1 is opened. The gas coming out of the main cooler C1 enters the second adsorption tower AD1 through the first pipe D1, the second pipe D2, and the inlet pipe Q1 of the second adsorption tower AD1. The second adsorption tower is in a cooling state. After the cold blowing is completed, the second control valve K2 on the inlet pipe Q1 of the second adsorption tower AD1 is opened. The gas enters the first pipe through the inlet pipe Q1 of the second adsorption tower AD1. The third control valve K3 on the section of the first pipe D1 between the regeneration cooler C2 and the sixth pipe D6 of the second adsorption tower AD2 is opened. The gas is cooled in the regeneration cooler and then enters the third pipe D3.

[0078] Working status two, step two, such as Figure 9 As shown: When the flow regulating valve FCV is opened, the first adsorption tower AD1 and the third adsorption tower AD3 will start adsorption. After the selection is completed, the adsorption operation of the first adsorption tower AD1 and the third adsorption tower AD3 is consistent with the process of working state one.

[0079] In the description of this utility model, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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 utility model. In the description of this utility model, unless otherwise specified and limited, it should be noted that the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components, and can be direct connections or indirect connections through an intermediate medium. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0080] Obviously, the above embodiments are merely examples for clear illustration and are not intended to limit the implementation. For those skilled in the art, other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all implementation methods here, and any obvious variations or modifications derived therefrom are still within the protection scope of this utility model.

Claims

1. A three-tower thermal regeneration adsorption gas drying system, comprising a main cooler, a first adsorption tower, and a second adsorption tower, wherein the inlet end of the main cooler is connected to a gas inlet pipe, and the outlet end of the main cooler is connected to the inlet ends of the first and second adsorption towers respectively, characterized in that, It also includes a third adsorption tower and a regeneration cooler. The outlet of the regeneration cooler is connected to the inlet of the first adsorption tower and the second adsorption tower, respectively. The inlet of the regeneration cooler is connected to the inlet of the third adsorption tower. The outlet of the main cooler is also connected to a regeneration heater. The outlet of the third adsorption tower is connected to the regeneration heater. The outlets of the first adsorption tower, the second adsorption tower and the third adsorption tower are all connected to a gas outlet pipe. The gas outlet pipe and the gas inlet pipe are each equipped with a first temperature detector and a first pressure detector.

2. The three-tower thermal regenerative adsorption gas drying system as described in claim 1, characterized in that, The first adsorption tower, the second adsorption tower, and the third adsorption tower are all connected to exhaust pipes at their gas outlet ends, and all three exhaust pipes are connected to the gas outlet pipe.

3. The three-tower thermal regenerative adsorption gas drying system as described in claim 1, characterized in that, The main cooler is connected to the regenerative cooler via a first pipe, the two ends of which are connected to the air outlet of the main cooler and the air inlet of the regenerative cooler, respectively; the regenerative heater is located on the first pipe.

4. The three-tower thermal regenerative adsorption gas drying system as described in claim 3, characterized in that, The first adsorption tower, the second adsorption tower, and the third adsorption tower are all connected to an air inlet pipe at their inlet ends, and all three air inlet pipes are connected to the first pipe through a second pipe.

5. The three-tower thermal regenerative adsorption gas drying system as described in claim 4, characterized in that, The outlet of the regenerative cooler is connected to a third pipe, and the other end of the third pipe is connected to three fourth pipes, which are respectively connected to the inlet of the first adsorption tower, the second adsorption tower and the third adsorption tower. The third pipe has a third temperature detector, and each of the three fourth pipes has a first control valve.

6. The three-tower thermal regenerative adsorption gas drying system as described in claim 5, characterized in that, A fifth pipe is connected to the first pipe, and the fifth pipe is connected to the third pipe. A flow regulating valve is installed on the section of the fifth pipe that is connected to the first pipe and the third pipe.

7. The three-tower thermal regenerative adsorption gas drying system as described in claim 6, characterized in that, The inlet ends of the first adsorption tower, the second adsorption tower, and the third adsorption tower are all connected to a sixth pipe, and all three sixth pipes are connected to the first pipe. Each of the three sixth pipes has a second control valve.

8. The three-tower thermal regenerative adsorption gas drying system as described in claim 7, characterized in that, A second temperature detector is located on the first pipe between the regeneration heater and the sixth pipe of the first adsorption tower.

9. The three-tower thermal regenerative adsorption gas drying system as described in claim 8, characterized in that, A third control valve is provided on the section of the first pipe that connects to the regeneration heater and on the section of the first pipe that connects to the regeneration cooler and the sixth pipe of the second adsorption tower. Each of the three fourth pipelines has a fourth control valve.

10. The three-tower thermal regenerative adsorption gas drying system as described in claim 8, characterized in that, A fourth control valve is installed on the section of the second pipe that connects to the inlet pipe of the first adsorption tower, and on the section of the second pipe that connects to the fourth pipe of the second adsorption tower.

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