Dehydration molecular sieve system

Abstract

The utility model discloses a dehydration molecular sieve system which comprises a storage tank, a molecular sieve is filled in the storage tank, the opposite inner walls of the storage tank are connected with a separation unit, one side of the bottom of the storage tank is connected with a water-containing solvent storage tank through a feeding unit, and one side wall of the storage tank is connected with a gas phase feeding unit. The side wall, opposite to the gas phase feeding unit, of the storage tank is connected with a dry solvent storage tank through a discharging unit, the side wall, opposite to the gas phase feeding unit, of the storage tank is further connected with a gas phase discharging unit, the top of the storage tank is connected with a nitrogen feeding unit, the bottom of the storage tank is further connected with a pollution discharge unit, and the pollution discharge unit is connected with the dry solvent storage tank. The horizontal storage tank is adopted, no invalid space exists at the bottom, the dehydration and adsorption time is shortened, the storage tank is completely filled with molecular sieves, the structure is compact, the treatment efficiency is high, a solvent on the left side of the separation unit flows back to the to-be-treated water-containing solvent storage tank, a solvent on the right side of the separation unit flows back to the dry solvent storage tank, and the solvent flowing back to the water-containing solvent storage tank is reduced; and the dehydration efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of integrated organic waste gas treatment systems, and particularly relates to a dehydration molecular sieve system. Background Art

[0002] Organic waste gas pollution comes from a wide range of sources and affects a wide range of industries. It is also flammable, explosive, toxic, and difficult to treat. Currently, the mainstream treatment technologies for organic waste gas include regenerative thermal oxidation (RTO) and solvent recovery technologies.

[0003] The principle of thermal storage oxidation waste gas treatment technology is to incinerate organic waste gas under high temperature conditions to generate carbon dioxide and water, and use a ceramic thermal storage bed to recover the heat after incineration to achieve the effect of treatment and energy saving. Solvent recovery technology is to recycle the organic solvent in organic waste gas through adsorption-desorption-dehydration-distillation and other processes to achieve the purpose of purification. Compared with traditional RTO treatment, solvent recovery technology is not only energy-saving but also can recycle a large amount of solvent. On the premise of meeting the treatment requirements and meeting environmental protection, it can save a lot of raw materials for customers. In recent years, it has been increasingly recognized by the market.

[0004] Solvent recovery technology requires a well-designed tank structure to ensure that gases or liquids can evenly pass through the molecular sieve bed, allowing for full contact between the molecular sieve and the material being treated, thereby maximizing the molecular sieve's adsorption capacity. However, existing tanks are mostly vertical, with large dead space at the bottom. Furthermore, after dehydration, the entire solution in these traditional tanks flows back into the tank, significantly reducing dehydration efficiency. Utility Model Content

[0005] The purpose of the utility model is to provide a dehydration molecular sieve system, which solves the problem of low dehydration efficiency caused by the complete reflux of the solution in the storage tank in the prior art.

[0006] The technical solution adopted by the present invention is a dehydration molecular sieve system, comprising a storage tank filled with molecular sieve, opposite inner walls of the storage tank connected to a separation unit, one side of the bottom of the storage tank connected to an aqueous solvent storage tank through a feed unit, one side wall of the storage tank connected to a gas phase feed unit, the side wall of the storage tank opposite to the gas phase feed unit connected to a dry solvent storage tank through a discharge unit, the side wall of the storage tank opposite to the gas phase feed unit also connected to a gas phase discharge unit, the top of the storage tank connected to a nitrogen feed unit, the bottom of the storage tank also connected to a sewage discharge unit, and the sewage discharge unit connected to the dry solvent storage tank.

[0007] The utility model is also characterized in that:

[0008] The separation unit includes two first partitions connected to the inner wall of the same side of the storage tank, and a second partition is connected to the inner wall of the storage tank opposite to the first partition. The second partition is arranged between the two first partitions, and the lengths of the first partition and the second partition are not greater than the width of the storage tank.

[0009] The storage tank is configured as a horizontal storage tank, and a breathing valve interface is provided on one side of the top of the storage tank, and the breathing valve interface is provided close to the gas phase feeding unit.

[0010] The gas phase feeding unit includes a gas phase feeding pipe, a gas phase feeding port is opened on the side wall of the storage tank, a breathing valve interface is arranged near the gas phase feeding port, the gas phase feeding pipe is connected to the gas phase feeding port, and the pipe body of the gas phase feeding pipe is connected to the gas phase feeding cut-off valve.

[0011] The gas phase discharge unit includes a gas phase discharge port, which is opened on the side wall of the storage tank opposite to the gas phase feed port. The gas phase discharge port is connected to a gas phase discharge pipe, and the pipe body of the gas phase discharge pipe is connected to a gas phase discharge cut-off valve.

[0012] The feeding unit includes a solvent feed port, which is opened on one side of the bottom of the storage tank. The solvent feed port is connected to a feed pipe, which is connected to a diaphragm pump. The diaphragm pump is connected to the aqueous solvent storage tank through a connecting pipe. The body of the feed pipe is connected to a feed shut-off valve, which is arranged between the diaphragm pump and the solvent feed port.

[0013] The discharge unit includes a discharge port, which is connected to a screen. The discharge port is opened on the side wall of the storage tank. The discharge port and the gas phase discharge port are opened on the same side wall of the storage tank. The discharge port is arranged near the top of the storage tank. The discharge port is connected to a discharge pipe, which is connected to the dry solvent storage tank. The pipe body of the discharge pipe is connected to a discharge shut-off valve.

[0014] The nitrogen feed unit includes a nitrogen feed port, which is opened at the top of the storage tank. The nitrogen feed port is connected to a thermal oil electric heater through a nitrogen feed pipe. The thermal oil electric heater is connected to a connecting pipe. The nitrogen feed pipe is connected to a nitrogen feed shut-off valve.

[0015] The sewage discharge unit includes a sewage outlet, which is opened at the bottom of the storage tank. The sewage outlet and the solvent feed port are respectively arranged near the two sides of the storage tank. The sewage outlet is connected to a sewage pipe. The end of the sewage pipe away from the sewage outlet is connected to the dry solvent storage tank. The pipe body of the sewage pipe is connected to a sewage shut-off valve. The sewage pipe is also connected to an extension pipe, and the end of the extension pipe is connected to a liquid level switch.

[0016] A temperature detection element interface is also provided on the top of the storage tank.

[0017] The beneficial effects of the utility model are:

[0018] The utility model discloses a dehydration molecular sieve system, which adopts a horizontal storage tank with no dead space at the bottom, thus reducing the dehydration adsorption time. The storage tank is completely filled with molecular sieves, which has a compact structure and high processing efficiency. The solvent on the left side of the separation unit flows back to the water-containing solvent storage tank to be processed, and the solvent on the right side flows back to the dry solvent storage tank, thus reducing the solvent flowing back to the water-containing solvent storage tank and increasing the dehydration efficiency. In addition, an independent nitrogen source is adopted, and the nitrogen in the dehydration stage can directly enter the third dehydration stage after being heated by heat-conducting oil, without any waiting, and the processing efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of the dehydration molecular sieve system of the utility model;

[0020] Figure 2 It is a schematic diagram of the internal structure of the storage tank in the dehydration molecular sieve system of the utility model.

[0021] In the figure: 1. Storage tank, 2. Aqueous solvent storage tank, 3. Dry solvent storage tank, 4. First partition, 5. Second partition, 6. Breathing valve interface, 7. Gas phase feed pipe, 8. Gas phase feed port, 9. Gas phase feed shut-off valve, 10. Gas phase discharge port, 11. Gas phase discharge pipe, 12. Gas phase discharge shut-off valve, 13. Solvent feed port, 14. Feed pipe, 15. Diaphragm pump, 16. Feed shut-off valve, 17. Discharge port, 18. Discharge pipe, 19. Discharge shut-off valve, 20. Nitrogen feed port, 21. Nitrogen feed pipe, 22. Thermal oil electric heater, 23. Nitrogen feed shut-off valve, 24. Drain port, 25. Drain pipe, 26. Drain shut-off valve, 27. Liquid level switch, 28. Temperature detection element interface, 29. Extension pipe. DETAILED DESCRIPTION

[0022] The present invention will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0023] The utility model provides a dehydration molecular sieve system, such as Figure 1 As shown, it includes a storage tank 1 filled with molecular sieves, a separation unit connected to the opposite inner walls of the storage tank 1, an aqueous solvent storage tank 2 connected to the bottom side of the storage tank 1 through a feed unit, a gas phase feed unit connected to one side wall of the storage tank 1, a dry solvent storage tank 3 connected to the side wall of the storage tank 1 opposite to the gas phase feed unit through a discharge unit, a gas phase discharge unit also connected to the side wall of the storage tank 1 opposite to the gas phase feed unit, a nitrogen feed unit connected to the top of the storage tank 1, and a sewage discharge unit connected to the bottom of the storage tank 1, which is connected to the dry solvent storage tank 3. The entire storage tank 1 is filled with molecular sieves and connected to the separation unit to avoid short-circuiting of the liquid solvent and increase sufficient contact between the solvent and the molecular sieve. The separated solvent enters the dry solvent storage tank 3 from the discharge unit.

[0024] Example 1

[0025] The dehydration molecular sieve system includes a storage tank 1, which is filled with molecular sieve. The opposite inner walls of the storage tank 1 are connected to a separation unit. One side of the bottom of the storage tank 1 is connected to an aqueous solvent storage tank 2 through a feed unit. One side wall of the storage tank 1 is connected to a gas phase feed unit. The side wall of the storage tank 1 opposite to the gas phase feed unit is connected to a dry solvent storage tank 3 through a discharge unit. The side wall of the storage tank 1 opposite to the gas phase feed unit is also connected to a gas phase discharge unit. The top of the storage tank 1 is connected to a nitrogen feed unit. The bottom of the storage tank 1 is also connected to a sewage discharge unit, and the sewage discharge unit is connected to the dry solvent storage tank 3.

[0026] like Figure 2 As shown, the separation unit includes two first partitions 4 connected to the inner wall of the same side of the storage tank 1. A second partition 5 is connected to the inner wall of the storage tank 1 opposite the first partition 4. The second partition 5 is disposed between the two first partitions 4. The lengths of the first partition 4 and the second partition 5 are no greater than the width of the storage tank 1. The two first partitions 4 are connected to the bottom sidewall of the storage tank 1, and the second partition 5 is connected to the top inner wall of the storage tank 1. The lengths of the first partition 4 and the second partition 5 are both less than the width of the storage tank 1 to ensure smooth passage of materials. A through hole is opened near the bottom of the second partition 5 on the far right to facilitate the discharge of solvent from the storage tank 1 after it has been allowed to stand.

[0027] Storage tank 1 is configured as a horizontal tank. A breathing valve interface 6 is provided on one side of the top of the tank 1, located near the gas-phase feed unit. Compared to traditional vertical tanks, the horizontal tank 1 has no dead space at the bottom, reducing dehydration and adsorption time. The breathing valve interface 6 is located on the left side of the first baffle 4 on the left and is connected to the breathing valve to balance the pressure within the tank at different stages.

[0028] Example 2

[0029] The dehydration molecular sieve system includes a storage tank 1, which is filled with molecular sieve. The opposite inner walls of the storage tank 1 are connected to a separation unit. One side of the bottom of the storage tank 1 is connected to an aqueous solvent storage tank 2 through a feed unit. One side wall of the storage tank 1 is connected to a gas phase feed unit. The side wall of the storage tank 1 opposite to the gas phase feed unit is connected to a dry solvent storage tank 3 through a discharge unit. The side wall of the storage tank 1 opposite to the gas phase feed unit is also connected to a gas phase discharge unit. The top of the storage tank 1 is connected to a nitrogen feed unit. The bottom of the storage tank 1 is also connected to a sewage discharge unit, and the sewage discharge unit is connected to the dry solvent storage tank 3.

[0030] The gas-phase feed unit includes a gas-phase feed pipe 7, a gas-phase feed port 8 formed in the side wall of the storage tank 1, and a breathing valve interface 6 disposed near the gas-phase feed port 8. The gas-phase feed pipe 7 is connected to the gas-phase feed port 8, and the pipe body of the gas-phase feed pipe 7 is connected to a gas-phase feed shut-off valve 9. The gas-phase material enters the storage tank 1 from the gas-phase feed pipe 7 through the gas-phase feed port 8, and the gas-phase feed shut-off valve 9 controls the gas-phase feed.

[0031] The gas-phase discharge unit includes a gas-phase discharge port 10, which is located on the side wall of the storage tank 1 opposite the gas-phase feed port 8. A gas-phase discharge pipe 11 is connected to the gas-phase discharge shut-off valve 12. The processed gas-phase material is discharged from the gas-phase discharge port 10 through the gas-phase discharge pipe 11. The gas-phase discharge shut-off valve 12 controls the gas-phase discharge.

[0032] Example 3

[0033] The dehydration molecular sieve system includes a storage tank 1, which is filled with molecular sieve. The opposite inner walls of the storage tank 1 are connected to a separation unit. One side of the bottom of the storage tank 1 is connected to an aqueous solvent storage tank 2 through a feed unit. One side wall of the storage tank 1 is connected to a gas phase feed unit. The side wall of the storage tank 1 opposite to the gas phase feed unit is connected to a dry solvent storage tank 3 through a discharge unit. The side wall of the storage tank 1 opposite to the gas phase feed unit is also connected to a gas phase discharge unit. The top of the storage tank 1 is connected to a nitrogen feed unit. The bottom of the storage tank 1 is also connected to a sewage discharge unit, and the sewage discharge unit is connected to the dry solvent storage tank 3.

[0034] The feed unit includes a solvent feed port 13, which is located at one side of the bottom of the storage tank 1. The solvent feed port 13 is connected to a feed pipe 14, which is connected to a diaphragm pump 15. The diaphragm pump 15 is connected to the aqueous solvent storage tank 2 via a connecting pipe. The body of the feed pipe 14 is connected to a feed shut-off valve 16, which is disposed between the diaphragm pump 15 and the solvent feed port 13. The solvent feed port 13 is disposed on the left side of the first baffle 4 on the left side. The aqueous solvent to be treated enters the storage tank 1 from the aqueous solvent storage tank 2 via the diaphragm pump 15, the feed pipe 14, and the solvent feed port 13, and is dehydrated by the molecular sieve and then overflowed and discharged.

[0035] The discharge unit includes a discharge port 17, which is connected to a screen. The discharge port 17 is opened on the side wall of the storage tank 1. The discharge port 17 and the gas phase discharge port 10 are opened on the same side wall of the storage tank 1. The discharge port 17 is arranged near the top of the storage tank 1. The discharge port 17 is connected to a discharge pipe 18, which is connected to the dry solvent storage tank 3. The pipe body of the discharge pipe 18 is connected to a discharge shut-off valve 19. The aqueous solvent dehydrated by the molecular sieve overflows and is discharged from the discharge port 17. A screen is provided at the discharge port 17 to prevent the molecular sieve from being carried into the discharge pipe 18 by the solvent and causing blockage. The discharged solvent enters the dry solvent storage tank 3 through the discharge pipe 18 for storage.

[0036] Example 4

[0037] The dehydration molecular sieve system includes a storage tank 1, which is filled with molecular sieve. The opposite inner walls of the storage tank 1 are connected to a separation unit. One side of the bottom of the storage tank 1 is connected to an aqueous solvent storage tank 2 through a feed unit. One side wall of the storage tank 1 is connected to a gas phase feed unit. The side wall of the storage tank 1 opposite to the gas phase feed unit is connected to a dry solvent storage tank 3 through a discharge unit. The side wall of the storage tank 1 opposite to the gas phase feed unit is also connected to a gas phase discharge unit. The top of the storage tank 1 is connected to a nitrogen feed unit. The bottom of the storage tank 1 is also connected to a sewage discharge unit, and the sewage discharge unit is connected to the dry solvent storage tank 3.

[0038] The nitrogen feed unit includes a nitrogen inlet 20, located at the top of the storage tank 1. This inlet is connected to a thermal oil electric heater 22 via a nitrogen feed pipe 21. The thermal oil electric heater 22 is connected to a connecting pipe, and the nitrogen feed pipe 21 is connected to a nitrogen feed shut-off valve 23. Nitrogen inlet 20 is located between the first and second baffles 4 and 5 on the left side. Nitrogen is introduced into the storage tank 1, removing and cleaning any residual solvent on the surface of the molecular sieve and any water contained within the molecular sieve. In conventional processes, high-temperature nitrogen is generated during the heating phase of the desorption process. When the desorption process is not in the heating phase, the third stage of the dehydration process is in a waiting state until the desorption heating phase begins, typically with a pause of at least 1-2 hours. This system utilizes an independent nitrogen source, completely disconnected from the desorption module. The nitrogen in the dehydration phase is heated by thermal oil before entering the third stage of dehydration, eliminating the need for any waiting and resulting in high processing efficiency. Traditional processes for thermal oil heating basically use thermal oil boilers. Since thermal oil boilers are open flame equipment, they have strict fire protection distance requirements from Class A facilities. Thermal oil boilers are pressure vessels, and their manufacturing, installation, and subsequent operation require high personnel requirements. At the same time, the one-time investment cost of the entire device is greatly increased. This system uses thermal oil electric heaters to achieve complete automatic control, seamlessly connect with the main process, and achieve dual optimization of energy consumption and investment.

[0039] The drain unit includes a drain port 24, which is located at the bottom of the storage tank 1. The drain port 24 and the solvent feed port 13 are located near either side of the storage tank 1. A drain pipe 25 is connected to the drain port 24. The end of the drain pipe 25, away from the drain port 24, is connected to the dry solvent storage tank 3. A drain shut-off valve 26 is connected to the drain pipe 25. The drain pipe 25 is also connected to an extension pipe 29, the end of which is connected to a liquid level switch 27. When the liquid level switch 27 is activated, it indicates that the solvent in the storage tank has been completely drained.

[0040] A temperature detection element interface 28 is also provided on the top of the storage tank 1. The temperature detection element interface 28 is provided between the second partition plate 5 and the first partition plate 4 on the right side, and is connected to a temperature detection element for detecting the temperature inside the storage tank 1.

[0041] The working principle of the utility model dehydration molecular sieve system is as follows:

[0042] The first stage: the aqueous solvent to be treated enters the storage tank 1 through the diaphragm pump 15, is dehydrated by the molecular sieve, and overflows from the discharge port 17 to be stored in the dry solvent storage tank 3;

[0043] The second stage: the diaphragm pump 15, the feed shut-off valve 16, and the discharge shut-off valve 19 are closed, and after the solvent remaining in the storage tank 1 is allowed to stand for a certain period of time, the nitrogen feed shut-off valve 23, the feed shut-off valve 16, and the sewage shut-off valve 26 are opened. The solvent that meets the dehydration requirements enters the dry solvent storage tank 3 from the sewage outlet 24, and the solvent that does not meet the requirements flows back to the aqueous solvent storage tank 1 from the solvent feed inlet 13;

[0044] The third stage: when the liquid level switch 27 is actuated, it is considered that the solvent in the storage tank 1 has been completely drained, the feed shut-off valve 16 and the discharge shut-off valve are cut off, the nitrogen feed shut-off valve 23, the gas phase feed shut-off valve 9 and the gas phase discharge shut-off valve 12 are opened, nitrogen is introduced, and the thermal oil electric heater 22 is started to remove and clean the residual solvent on the surface of the molecular sieve and the moisture contained in the molecular sieve; the thermal oil electric heater 22 is turned off, the storage tank 1 is cooled to a certain temperature, and the next dehydration process is waited for.

[0045] The utility model discloses a dehydration molecular sieve system, which adopts a horizontal storage tank with no dead space at the bottom, thus reducing the dehydration adsorption time. The storage tank is completely filled with molecular sieves, which has a compact structure and high processing efficiency. The solvent on the left side of the separation unit flows back to the water-containing solvent storage tank to be processed, and the solvent on the right side flows back to the dry solvent storage tank, thus reducing the solvent flowing back to the water-containing solvent storage tank and increasing the dehydration efficiency. In addition, an independent nitrogen source is adopted, and the nitrogen in the dehydration stage can directly enter the third dehydration stage after being heated by heat-conducting oil, without any waiting, and the processing efficiency is high.

Claims

1. Dehydration molecular sieve system, characterized in that, The invention comprises a storage tank (1), wherein the storage tank (1) is filled with a molecular sieve, the opposite inner walls of the storage tank (1) are connected to a separation unit, one side of the bottom of the storage tank (1) is connected to an aqueous solvent storage tank (2) via a feed unit, one side wall of the storage tank (1) is connected to a gas phase feed unit, the side wall of the storage tank (1) opposite to the gas phase feed unit is connected to a dry solvent storage tank (3) via a discharge unit, the side wall of the storage tank (1) opposite to the gas phase feed unit is further connected to a gas phase discharge unit, the top of the storage tank (1) is connected to a nitrogen feed unit, the bottom of the storage tank (1) is further connected to a sewage discharge unit, and the sewage discharge unit is connected to the dry solvent storage tank (3).

2. The dehydration molecular sieve system according to claim 1, characterized in that: The separation unit comprises two first partitions (4) connected to the inner wall on the same side of the storage tank (1); a second partition (5) is connected to the inner wall of the storage tank (1) opposite to the first partition (4); the second partition (5) is arranged between the two first partitions (4); and the lengths of the first partition (4) and the second partition (5) are not greater than the width of the storage tank (1).

3. The dehydration molecular sieve system according to claim 1, characterized in that: The storage tank (1) is configured as a horizontal storage tank, and a breathing valve interface (6) is provided on one side of the top of the storage tank (1), and the breathing valve interface (6) is provided close to the gas phase feeding unit.

4. The dehydration molecular sieve system according to claim 1, characterized in that: The gas phase feeding unit comprises a gas phase feeding pipe (7), a gas phase feeding port (8) is provided on the side wall of the storage tank (1), a breathing valve interface (6) is provided near the gas phase feeding port (8), the gas phase feeding pipe (7) is connected to the gas phase feeding port (8), and the pipe body of the gas phase feeding pipe (7) is connected to a gas phase feeding shut-off valve (9).

5. The dehydration molecular sieve system according to claim 1, characterized in that: The gas phase discharge unit comprises a gas phase discharge port (10), the gas phase discharge port (10) being opened on a side wall of the storage tank (1) opposite to the gas phase feed port (8), the gas phase discharge port (10) being connected to a gas phase discharge pipe (11), and the pipe body of the gas phase discharge pipe (11) being connected to a gas phase discharge shut-off valve (12).

6. The dehydration molecular sieve system according to claim 1, characterized in that: The feed unit comprises a solvent feed port (13), the solvent feed port (13) is opened at one side of the bottom of the storage tank (1), the solvent feed port (13) is connected to a feed pipe (14), the feed pipe (14) is connected to a diaphragm pump (15), the diaphragm pump (15) is connected to the aqueous solvent storage tank (2) via a connecting pipe, the pipe body of the feed pipe (14) is connected to a feed shut-off valve (16), and the feed shut-off valve (16) is arranged between the diaphragm pump (15) and the solvent feed port (13).

7. The dehydration molecular sieve system according to claim 1, characterized in that: The discharge unit includes a discharge port (17), the discharge port (17) is connected to a screen, the discharge port (17) is opened on the side wall of the storage tank (1), the discharge port (17) and the gas phase discharge port (10) are opened on the same side wall of the storage tank (1), the discharge port (17) is arranged near the top of the storage tank (1), the discharge port (17) is connected to a discharge pipe (18), the discharge pipe (18) is connected to the dry solvent storage tank (3), and the pipe body of the discharge pipe (18) is connected to a discharge shut-off valve (19).

8. The dehydration molecular sieve system according to claim 1, characterized in that: The nitrogen feed unit comprises a nitrogen feed port (20), the nitrogen feed port (20) being opened at the top of the storage tank (1), the nitrogen feed port (20) being connected to a thermal oil electric heater (22) via a nitrogen feed pipe (21), the thermal oil electric heater (22) being connected to a connecting pipe, and the nitrogen feed pipe (21) being connected to a nitrogen feed shut-off valve (23).

9. The dehydration molecular sieve system according to claim 1, characterized in that: The sewage discharge unit includes a sewage discharge port (24), the sewage discharge port (24) is opened at the bottom of the storage tank (1), the sewage discharge port (24) and the solvent feed port (13) are respectively arranged near the two sides of the storage tank (1), the sewage discharge port (24) is connected to a sewage discharge pipe (25), the end of the sewage discharge pipe (25) away from the sewage discharge port (24) is connected to the dry solvent storage tank (3), the pipe body of the sewage discharge pipe (25) is connected to a sewage discharge shut-off valve (26), the sewage discharge pipe (25) is also connected to an extension pipe (29), and the end of the extension pipe (29) is connected to a liquid level switch (27).

10. The dehydration molecular sieve system according to claim 1, characterized in that: A temperature detection element interface (28) is also provided on the top of the storage tank (1).

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