System for regenerating molecular sieve by using waste heat of hydrogenation compressor

Abstract

This utility model relates to the field of hydrogen compression and storage technology, specifically proposing a system for regenerating molecular sieves using waste heat from a hydrogen refueling compressor. The system includes at least two drying units, some for drying hydrogen and others for regeneration. Each drying unit includes a drying tank, consisting of a sealed outer tank and a sealed inner tank filled with molecular sieves. A sealed airflow chamber is formed between the outer and inner tanks. Wet hydrogen produced by a hydrogen electrolyzer is input into the inner tank of the drying unit, where it is adsorbed and dried by the molecular sieves. The dried hydrogen is then compressed and pressurized by the hydrogen refueling compressor, simultaneously heating the hydrogen. This high-temperature hydrogen is input into the airflow chamber of the regeneration drying unit to heat and regenerate the molecular sieves. Simultaneously, the hydrogen cools and is stored in a storage tank. This cycle of hydrogen compression and storage is repeated. The regeneration of the molecular sieves requires no additional energy; the high-temperature hydrogen generated during hydrogen refueling is used for heating, thus reusing waste heat, making it green and energy-saving.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen compression and storage technology, specifically to a system for regenerating molecular sieves using waste heat from a hydrogenation compressor. Background Technology

[0002] Hydrogen energy, as a clean and efficient secondary energy source, is an important direction for the current energy structure transformation. In the industrial production and application of hydrogen, water electrolysis is one of the mainstream green hydrogen production technologies. Hydrogen produced by water electrolysis needs to be compressed and stored to meet subsequent usage requirements. Since hydrogen produced by water electrolysis usually contains a large amount of water, it must be dried before compression.

[0003] Specifically, the hydrogen produced by electrolysis first enters a molecular sieve dryer. Due to its porous structure and strong hydrophilicity, the molecular sieve effectively adsorbs moisture from the hydrogen, lowering the hydrogen dew point to below -40°C. The dried hydrogen then enters a hydrogen refueling compressor, where it undergoes multi-stage compression to reach the required pressure (e.g., 45 MPa) before being injected into a hydrogen storage tank or used for hydrogen supply at hydrogen refueling stations.

[0004] In this process, the molecular sieve reaches saturation after adsorbing a certain amount of water and must be regenerated to restore its adsorption capacity. Conventional regeneration methods require heating the molecular sieve to 80–120°C to evaporate and desorb the adsorbed water, a process that consumes a large amount of electrical energy.

[0005] Meanwhile, during the hydrogen compression process, the hydrogen temperature rises significantly due to the adiabatic compression effect, typically reaching around 120°C at the outlet. This high-temperature, high-pressure hydrogen must be forcibly cooled to 40–50°C by a cooler before being injected into the hydrogen storage tank to meet the safety requirements of the storage equipment.

[0006] It is evident that, on the one hand, molecular sieve regeneration requires a heat input of 80–120°C, while on the other hand, the high-temperature compression heat generated by the hydrogenation compressor is discharged as waste heat through the cooler, creating a contradictory situation where "heat demand" and "heat discharge" coexist. How to effectively recover the compression heat energy generated by the hydrogenation compressor and directly use it for the heating and regeneration of molecular sieves to achieve the coupled utilization of heat energy within the system is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0007] Therefore, this invention provides a system for regenerating molecular sieves using waste heat from a hydrogenation compressor, in order to solve the technical problems of the prior art.

[0008] To achieve the above objectives, this utility model provides the following technical solution: A system for regenerating molecular sieves using waste heat from a hydrogenation compressor includes a first pipe connected to a hydrogen electrolyzer, a second and a third pipe connected to the input and output ends of the hydrogenation compressor respectively, and a fourth pipe connected to a gas storage tank; it also includes at least two drying devices; each drying device includes a drying tank; the drying tank includes a sealed outer tank and a sealed inner tank disposed inside the outer tank; the inner tank is filled with molecular sieves; a sealed airflow cavity is formed between the inner wall of the outer tank and the outer wall of the inner tank; the bottom of the drying tank is provided with a drying input pipe connected to the inner tank, and the top is provided with a drying output pipe connected to the inner tank; the bottom of one side wall of the drying tank is provided with a regeneration input pipe connected to the airflow cavity, and the top is provided with a drain pipe connected to the inner tank, and the upper part of the other side wall is provided with a regeneration input pipe connected to the airflow cavity. A regeneration output pipe is provided, which is connected to the airflow chamber; the drying input pipe is connected to a first airflow pipe; a first solenoid valve is installed in the first airflow pipe; the drying output pipe is connected to a second airflow pipe; a second solenoid valve is installed in the second airflow pipe; the regeneration input pipe is connected to a third airflow pipe; a third solenoid valve is installed in the third airflow pipe; the regeneration output pipe is connected to a fourth airflow pipe; a fourth solenoid valve is installed in the fourth airflow pipe; the drain pipe is connected to a fifth airflow pipe; a fifth solenoid valve is installed in the fifth airflow pipe; the first airflow pipe of each group of drying devices is connected to the first pipeline, the second airflow pipe is connected to the second pipeline, the third airflow pipe is connected to the third pipeline, and the fourth airflow pipe is connected to the fourth pipeline.

[0009] Preferably, a first pressure gauge is installed on the fifth gas flow pipe near the side of the fifth solenoid valve close to the drain pipe.

[0010] Preferably, it further includes a fifth pipe; the fifth pipe is connected to the first pipe via an injector; the fifth airflow pipe on the side of the fifth solenoid valve away from the drain pipe is connected to an exhaust pipe; a seventh solenoid valve is installed on the exhaust pipe; a sixth solenoid valve is installed on the fifth airflow pipe on the side of the exhaust pipe away from the drain pipe; the fifth airflow pipe of each group of drying devices is connected to the fifth pipe.

[0011] Preferably, a second pressure gauge and a pneumatic valve are sequentially installed on the first airflow pipe on the side of the first solenoid valve away from the drying input pipe.

[0012] Preferably, it further includes a pressure dividing main pipe; the first airflow pipe between the first solenoid valve and the second pressure gauge is connected to a pressure dividing pipe; an eighth solenoid valve is installed on the pressure dividing pipe; the pressure dividing pipe of each group of the drying devices is connected to the pressure dividing main pipe.

[0013] Preferably, the second airflow pipe is equipped with a dew point meter.

[0014] Preferably, the third airflow pipe is equipped with a first thermometer; the fourth airflow pipe is equipped with a second thermometer.

[0015] Preferably, the fourth pipe is equipped with a check valve.

[0016] This utility model has at least the following beneficial effects: It includes at least two drying units, some for drying hydrogen and others for regeneration. Each drying unit includes a drying tank consisting of a sealed outer tank and a sealed inner tank located inside the outer tank. The inner tank is filled with molecular sieves. A sealed gas flow chamber is formed between the outer and inner tanks. Wet hydrogen produced by the hydrogen electrolyzer is input into the inner tank of the drying unit and dried by the molecular sieves. The dried hydrogen is then compressed and pressurized by a hydrogenation compressor, heating it to approximately 80 to 120°C. It is then input into the gas flow chamber of the regeneration unit to heat and regenerate the molecular sieves. Simultaneously, the hydrogen is cooled to approximately 40°C and stored in a storage tank. This cycle of hydrogen compression and storage continues. The regeneration of the molecular sieves requires no additional energy; the high-temperature hydrogen generated during hydrogenation compressor compression is used for heating, and waste heat is reused, making it green and energy-saving.

[0017] Therefore, the system of this utility model that uses waste heat from a hydrogenation compressor to regenerate molecular sieves has the advantages of continuous hydrogen compression and storage, no need for additional energy for molecular sieve regeneration, waste heat reuse, and green energy saving. Attached Figure Description

[0018] To more clearly illustrate the prior art and the present invention, the accompanying drawings used in the description of the prior art and the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other drawings from the provided drawings without any creative effort.

[0019] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which this utility model can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0020] Figure 1 This is a schematic diagram of the structural composition of a system for regenerating molecular sieves using waste heat from a hydrogenation compressor, according to this utility model. Figure 2 This is a schematic diagram of the drying device structure of a system for regenerating molecular sieves using waste heat from a hydrogenation compressor, according to this utility model. Figure 3 This is a schematic diagram illustrating the working principle of a system for regenerating molecular sieves using waste heat from a hydrogenation compressor, according to this utility model.

[0021] Explanation of reference numerals in the attached figures: 1. Drying tank; 101. Outer tank; 102. Inner tank; 103. Molecular sieve; 104. Airflow chamber; 2. Drying input pipe; 3. Drying output pipe; 4. Regeneration input pipe; 5. Regeneration output pipe; 6. Drain pipe; 7. First airflow pipe; 8. Second airflow pipe; 9. Third airflow pipe; 10. Fourth airflow pipe; 11. Fifth airflow pipe; 12. Exhaust pipe; 13. First solenoid valve; 14. Second solenoid valve; 15. Third solenoid valve; 16. Fourth solenoid valve; 17. Fifth solenoid valve; 8. Sixth solenoid valve; 19. Seventh solenoid valve; 20. First thermometer; 21. Second thermometer; 22. Dew point meter; 23. First pressure gauge; 24. Hydrogen compressor; 25. Gas storage tank; 26. Injector; 27. First pipeline; 28. Second pipeline; 29. ​​Third pipeline; 30. Fourth pipeline; 31. Fifth pipeline; 32. Pressure dividing main pipe; 33. Pressure dividing pipe; 34. Check valve; 35. Second pressure gauge; 36. Pneumatic valve; 37. Eighth solenoid valve; 38. Hydrogen electrolyzer. Detailed Implementation

[0022] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] In the description of this application: unless otherwise stated, "a plurality of" means two or more. The terms "first," "second," "third," etc., in this application are intended to distinguish the objects referred to and do not have any special meaning in terms of technical connotation (e.g., they should not be construed as an emphasis on importance or order). Expressions such as "including," "comprising," and "having" also mean "not limited to" (certain units, components, materials, steps, etc.).

[0024] The terms used in this application, such as "upper," "lower," "left," "right," and "middle," are generally used to facilitate intuitive understanding by referring to the accompanying drawings, and are not absolute limitations on the positional relationships in the actual product. Changes in these relative positional relationships, without departing from the technical concept disclosed in this application, should also be considered within the scope of this application.

[0025] This invention relates to a system for regenerating molecular sieves using waste heat from a hydrogenation compressor, such as... Figure 1 , Figure 2As shown, a first pipeline 27 is provided, which is connected to a hydrogen electrolyzer 38 for transporting the produced wet hydrogen. The input and output ends of the hydrogen compressor 24 are connected to a second pipeline 28 and a third pipeline 29, respectively. A gas storage tank 25 is connected to a fourth pipeline 30. At least two sets of drying devices are also provided, some of which perform drying operations, and others perform regeneration operations. In this embodiment, there are three sets of drying devices, one of which performs drying operations, and the other two perform regeneration operations. After regeneration, the drying devices are ready for use. The three sets of drying devices can achieve uninterrupted hydrogen compression and storage operations. The drying device includes a drying tank 1. The drying tank 1 includes a sealed outer tank 101 and a sealed inner tank 102 disposed inside the outer tank 101. The wall of the inner tank 102 is made of a thermally conductive material, such as metal or graphite. The inner tank 102 is filled with a molecular sieve 103, which adsorbs water molecules. A sealed airflow cavity 104 is formed between the inner wall of the outer tank 101 and the outer wall of the inner tank 102, enclosing the inner tank 102. The bottom of the drying tank 1 is provided with a drying input pipe 2 communicating with the inner tank 102, and the top is provided with a drying output pipe 3 communicating with the inner tank 102. The bottom of one side wall of the drying tank 1 is provided with a regeneration input pipe 4 communicating with the airflow cavity 104, and the top is provided with a drain pipe 6 communicating with the inner tank 102. The upper part of the other side wall is provided with a regeneration output pipe 5 communicating with the airflow cavity 104. The drying input pipe 2 is connected to a first airflow pipe 7, and a first solenoid valve 13 is installed in the first airflow pipe 7. The drying output pipe 3 is connected to a second airflow pipe 8, and a second solenoid valve 14 is installed in the second airflow pipe 8. The regeneration input pipe 4 is connected to a third airflow pipe 9, and a third solenoid valve 15 is installed in the third airflow pipe 9. The regeneration output pipe 5 is connected to a fourth airflow pipe 10, and a fourth solenoid valve 16 is installed in the fourth airflow pipe 10. The drain pipe 6 is connected to the fifth airflow pipe 11, and the fifth airflow pipe 11 is equipped with the fifth solenoid valve 17. The first airflow pipe 7 of each drying unit is connected to the first pipe 27, the second airflow pipe 8 is connected to the second pipe 28, the third airflow pipe 9 is connected to the third pipe 29, and the fourth airflow pipe 10 is connected to the fourth pipe 30. When the drying unit performs drying operations, the third solenoid valve 15, the fourth solenoid valve 16, and the fifth solenoid valve 17 are all closed, and the first solenoid valve 13 and the second solenoid valve 14 are all open. When the drying unit performs regeneration operations, the third solenoid valve 15, the fourth solenoid valve 16, and the fifth solenoid valve 17 are all open, and the first solenoid valve 13 and the second solenoid valve 14 are all closed. When the drying unit is in standby mode, the first solenoid valve 13, the second solenoid valve 14, the third solenoid valve 15, the fourth solenoid valve 16, and the fifth solenoid valve 17 are all closed.During system operation, the wet hydrogen produced by the hydrogen electrolyzer 38 enters the drying tank 1 through the first pipeline 27 and the first gas flow pipe 7 of the drying device, where it is dried by the adsorption of moisture by the molecular sieve 103. It then flows out through the second gas flow pipe 8 and enters the hydrogen compressor 24 through the second pipeline 28 for pressurization. The temperature of the pressurized hydrogen reaches 80 to 120°C, which perfectly matches the regeneration temperature of the molecular sieve 103 (around 120°C). It then flows through the third pipeline 29 and the third gas flow pipe 9 of the regeneration drying device into the gas flow chamber 104, where it heats and regenerates the molecular sieve 103. The evaporated water vapor is discharged through the fifth gas flow pipe 11. The temperature of the hydrogen after heating the molecular sieve 103 is reduced to 40°C, fully meeting the storage requirements. This low-temperature hydrogen enters the storage tank 25 through the fourth gas flow pipe 10 and the fourth pipeline 30 for storage, completing the hydrogen compression storage. The regeneration of the molecular sieve 103 does not require additional energy; the hydrogen temperature rise caused by the hydrogen compressor 24 during compression is utilized, and the waste heat is reused, resulting in green and energy-saving operation.

[0026] Preferably, to prevent the molecular sieve 103 from collapsing due to excessive pressure inside the inner tank 102, a first pressure gauge 23 is installed on the fifth gas flow pipe 11 near the drain pipe 6 of the fifth solenoid valve 17. The first pressure gauge 23 monitors the pressure value. When the pressure value exceeds the threshold, the fifth solenoid valve 17 is opened to release pressure. When the pressure value returns to normal, the fifth solenoid valve 17 is closed.

[0027] Preferably, a fifth pipe 31 is also provided for recovering the hydrogen released during depressurization. To ensure that the hydrogen recovered by the fifth pipe 31 is well integrated into the wet hydrogen in the first pipe 27, the fifth pipe 31 is connected to the first pipe 27 via an injector 26. The injector 26 can be a commercially available product, which is an existing technology product, and its structure and principle will not be described in detail here. The hydrogen released during depressurization is drawn into the first pipe 27 through the injector 26. Since the fifth gas flow 11 also has the function of discharging water vapor during regeneration, an exhaust pipe 12 is connected to the fifth gas flow pipe 11 on the side of the fifth solenoid valve 17 away from the drain pipe 6. A seventh solenoid valve 19 is installed on the exhaust pipe 12. A sixth solenoid valve 18 is installed on the fifth gas flow pipe 11 on the side of the exhaust pipe 12 away from the drain pipe 6. The fifth gas flow pipe 11 of each drying unit is connected to the fifth pipe 31. Thus, during regeneration, the sixth solenoid valve 18 is closed, and the fifth solenoid valve 17 and the seventh solenoid valve 19 are opened. The regenerated water vapor is discharged from the exhaust pipe 12 through the vent pipe 6, the fifth gas flow pipe 11, and the exhaust pipe 12. During drying, when the pressure value of the first pressure gauge 23 is greater than the threshold, the fifth solenoid valve 17 and the sixth solenoid valve 18 are opened, and the seventh solenoid valve 19 is closed. The depressurized hydrogen gas is recovered through the vent pipe 6, the fifth gas flow pipe 11, and the fifth pipeline 31.

[0028] Preferably, in order to control the pressure inside the inner tank 102 and avoid excessive pressure from damaging the molecular sieve 103 inside, a second pressure gauge 35 and a pneumatic valve 36 are sequentially installed on the first airflow pipe 7 on the side of the first solenoid valve 13 away from the drying input pipe 2. The pneumatic valve 36 is a commercially available pneumatic butterfly valve. The opening amount of the pneumatic valve 36 is dynamically adjusted by the pressure value collected by the second pressure gauge 35.

[0029] Preferably, to avoid pressure abnormalities caused by abnormal blockage of the molecular sieve 103, a pressure dividing manifold 32 is also provided. A pressure dividing pipe 33 is connected to the first gas flow pipe 7 between the first solenoid valve 13 and the second pressure gauge 35, and an eighth solenoid valve 37 is installed on the pressure dividing pipe 33. The pressure dividing pipe 33 of each drying unit is connected to the pressure dividing manifold 32. In this way, when the pressure value collected by the second pressure gauge 35 is greater than the threshold, the eighth solenoid valve 37 of each drying unit opens. The hydrogen gas from the abnormal drying unit flows through the pressure dividing pipe 33, through the pressure dividing manifold, and the hydrogen gas from the normal drying unit flows through the pressure dividing pipe 33 and then into its first gas flow pipe 7.

[0030] Preferably, in order to ensure that the hydrogen dew point meets the standard and to monitor the saturation of the molecular sieve 103 in real time, a dew point meter 22 is installed in the second gas flow pipe 8. When the dew point value collected by the dew point meter 22 is greater than the threshold, the current drying tank 1 stops drying and switches to regeneration operation.

[0031] In practical applications, a control unit is usually also set up, and the control unit is selected as an industrial-grade PLC controller.

[0032] The drying device has three initial states. Standby state: Solenoid valve 13, solenoid valve 14, solenoid valve 15, solenoid valve 16, solenoid valve 17, solenoid valve 18, solenoid valve 19, solenoid valve 37, and pneumatic valve 36 are all closed. Drying state: The third solenoid valve 15, the fourth solenoid valve 16, the fifth solenoid valve 17, the sixth solenoid valve 18, the seventh solenoid valve 19, and the eighth solenoid valve 37 are all closed, while the first solenoid valve 13, the second solenoid valve 14, and the pneumatic valve 36 are all open. Regeneration status: Solenoid valve 13, solenoid valve 14, solenoid valve 18, solenoid valve 37, and pneumatic valve 36 are all closed, while solenoid valve 15, solenoid valve 16, solenoid valve 17, and solenoid valve 19 are all open.

[0033] The first solenoid valve 13, the second solenoid valve 14, the third solenoid valve 15, the fourth solenoid valve 16, the fifth solenoid valve 17, the sixth solenoid valve 18, the seventh solenoid valve 19, the eighth solenoid valve 37, the pneumatic valve 36, the first pressure gauge 23, the second pressure gauge 35, and the dew point meter 22 of each drying device are all electrically connected to the control unit. The control unit acquires the hydrogen dew point value collected by the dew point meter 22. When the value exceeds the threshold, it sends a closing command to the first solenoid valve 13, the second solenoid valve 14, and the pneumatic valve 36, stopping the hydrogen drying operation. Simultaneously, it sends an opening command to the third solenoid valve 15, the fourth solenoid valve 16, the fifth solenoid valve 17, and the seventh solenoid valve 19, initiating the regeneration operation. The regeneration operation typically takes 2 to 3 hours to complete, after which the regenerated drying unit enters standby mode. The control unit acquires the pressure value collected by the first pressure gauge 23. When the pressure exceeds the threshold, it sends an opening command to the fifth solenoid valve 17 and the sixth solenoid valve 18. When the pressure value returns to normal, it sends a closing command to the fifth solenoid valve 17 and the sixth solenoid valve 18. The control unit acquires the pressure value collected by the second pressure gauge 35. When the pressure exceeds the threshold, it sends an opening command to the eighth solenoid valve 37 of the current drying unit and the eighth solenoid valve 37 of other drying units. When the pressure returns to normal, these opened eighth solenoid valves 37 send a closing command.

[0034] Preferably, to facilitate monitoring of hydrogen temperature, a first thermometer 20 is installed in the third gas flow pipe 9, and a second thermometer 21 is installed in the fourth gas flow pipe 10. This allows for clear determination of the hydrogen temperature during regeneration and the hydrogen temperature entering the storage tank 25 after regeneration.

[0035] Preferably, to prevent hydrogen from flowing back into the gas storage tank 25, a one-way valve 34 is installed on the fourth pipeline 30.

[0036] The working principle of this application is as follows: Figure 3 As shown: Taking three sets of drying devices as an example, one set is in standby mode, one set is in drying mode, and one set is in regeneration mode.

[0037] The wet hydrogen produced by the hydrogen electrolyzer enters the inner tank through the first pipeline, then through the first gas flow pipe of the drying device in a drying state. There, the hydrogen is dried by the molecular sieves inside, which adsorb moisture. Once the molecular sieves are saturated, the drying device switches to a regeneration state, and simultaneously, the standby drying device switches to a drying state. The dried hydrogen then flows into the second pipeline through the second gas flow pipe, and is further pressurized by the hydrogen compressor. The pressurized, high-temperature hydrogen then flows into the third gas flow pipe of the regenerated drying device through the third pipeline, entering the gas flow chamber. As the high-temperature hydrogen flows through the gas flow chamber, it heats the molecular sieves in the inner tank. The moisture adsorbed by the molecular sieves evaporates and is discharged through the fifth gas flow pipe. Regeneration typically lasts 2 to 3 hours. After regeneration, the drying device switches to a standby state. The high-temperature hydrogen, after heating the regenerated molecular sieves, cools down and enters the fourth pipeline through the fourth gas flow pipe, eventually flowing into the storage tank. This cycle repeats, achieving continuous and uninterrupted production.

[0038] The present application has been described in a relatively specific and detailed manner above through general descriptions and specific embodiments. It should be understood that, based on the technical concept of the present application, several conventional adjustments or further innovations can be made to these specific embodiments; however, as long as they do not depart from the technical concept of the present application, the technical solutions obtained by these conventional adjustments or further innovations also fall within the protection scope of the claims of the present application.

Claims

1. A system for regenerating molecular sieves using waste heat from a hydrogenation compressor, comprising a first pipe (27) connected to a hydrogen electrolyzer (38), a second pipe (28) and a third pipe (29) connected to the input and output ends of the hydrogenation compressor (24) respectively, and a fourth pipe (30) connected to a gas storage tank (25), characterized in that, It also includes at least two sets of drying devices; the drying device includes a drying tank (1); the drying tank (1) includes a sealed outer tank (101) and a sealed inner tank (102) disposed inside the outer tank (101); the inner tank (102) is filled with molecular sieves (103); a sealed airflow cavity (104) is formed between the inner wall of the outer tank (101) and the outer wall of the inner tank (102); the bottom of the drying tank (1) is provided with a drying input pipe (2) communicating with the inner tank (102), and the top is provided with a drying output pipe (3) communicating with the inner tank (102); the bottom of one side wall of the drying tank (1) is provided with a regeneration input pipe (4) communicating with the airflow cavity (104), the top is provided with a drain pipe (6) communicating with the inner tank (102), and the upper part of the other side wall is provided with a regeneration output pipe (5) communicating with the airflow cavity (104); the drying input pipe (2) is connected to a first airflow pipe (7); the first The airflow pipe (7) is equipped with a first solenoid valve (13); the drying output pipe (3) is connected to a second airflow pipe (8); the second airflow pipe (8) is equipped with a second solenoid valve (14); the regeneration input pipe (4) is connected to a third airflow pipe (9); the third airflow pipe (9) is equipped with a third solenoid valve (15); the regeneration output pipe (5) is connected to a fourth airflow pipe (10); the fourth airflow pipe (10) is equipped with a fourth solenoid valve (16); the drain pipe (6) is connected to a fifth airflow pipe (11); the fifth airflow pipe (11) is equipped with a fifth solenoid valve (17); the first airflow pipe (7) of each drying device is connected to the first pipe (27), the second airflow pipe (8) is connected to the second pipe (28), the third airflow pipe (9) is connected to the third pipe (29), and the fourth airflow pipe (10) is connected to the fourth pipe (30).

2. The system for regenerating molecular sieves using waste heat from a hydrogenation compressor according to claim 1, characterized in that, The fifth solenoid valve (17) is equipped with a first pressure gauge (23) on the fifth airflow pipe (11) near the side of the drain pipe (6).

3. A system for regenerating molecular sieves using waste heat from a hydrogenation compressor according to claim 2, characterized in that, It also includes a fifth pipe (31); the fifth pipe (31) is connected to the first pipe (27) via an injector (26); the fifth airflow pipe (11) on the side of the fifth solenoid valve (17) away from the drain pipe (6) is connected to an exhaust pipe (12); the exhaust pipe (12) is equipped with a seventh solenoid valve (19); the fifth airflow pipe (11) on the side of the exhaust pipe (12) away from the drain pipe (6) is equipped with a sixth solenoid valve (18); the fifth airflow pipe (11) of each set of the drying device is connected to the fifth pipe (31).

4. A system for regenerating molecular sieves using waste heat from a hydrogenation compressor according to claim 3, characterized in that, The first solenoid valve (13) is connected to the first airflow pipe (7) on the side away from the drying input pipe (2) by a second pressure gauge (35) and a pneumatic valve (36).

5. A system for regenerating molecular sieves using waste heat from a hydrogenation compressor according to claim 4, characterized in that, It also includes a pressure distribution manifold (32); the first airflow pipe (7) between the first solenoid valve (13) and the second pressure gauge (35) is connected to a pressure distribution pipe (33); the pressure distribution pipe (33) is equipped with an eighth solenoid valve (37); the pressure distribution pipe (33) of each group of the drying device is connected to the pressure distribution manifold (32).

6. A system for regenerating molecular sieves using waste heat from a hydrogenation compressor according to claim 5, characterized in that, The second airflow pipe (8) is equipped with a dew point meter (22).

7. A system for regenerating molecular sieves using waste heat from a hydrogenation compressor according to any one of claims 1 to 6, characterized in that, The third airflow pipe (9) is equipped with a first thermometer (20); the fourth airflow pipe (10) is equipped with a second thermometer (21).

8. A system for regenerating molecular sieves using waste heat from a hydrogenation compressor according to any one of claims 1 to 6, characterized in that, The fourth pipe (30) is equipped with a check valve (34).

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