A self-healing hydrogen purification system and method

Abstract

This invention belongs to the field of hydrogen energy, specifically a hydrogen purification system and method with self-healing capabilities. Using product hydrogen as the regeneration gas, when the adsorption effect of the adsorbent decreases, the product gas can be directly returned to the PSA system through the long-tube vehicle for regeneration. This effectively avoids system replacement problems caused by using nitrogen for regeneration, eliminates post-regeneration replacement issues, and accelerates the time to production.

Description

Technical Field

[0001] This invention belongs to the field of hydrogen energy, and relates to hydrogen refueling mother stations, and in particular to a hydrogen purification system and purification method with self-repair function. Background Technology

[0002] Hydrogen purification equipment generally uses pressure swing adsorption (PSA) to purify hydrogen. The advantages of this method are that it is adsorption at room temperature, low investment, and low operating cost. It is widely used in hydrogen production from chlor-alkali tail gas, coal-to-hydrogen, and water electrolysis.

[0003] The general process flow of a hydrogen refueling mother station is as follows: Industrial by-product hydrogen from chemical plants is first purified by a power purification system (PSA). The purified hydrogen has a purity (mole fraction) of 99.999% or higher, meeting the requirements for high-purity hydrogen (GB / T 3634.2-2011) and the quality requirements for hydrogen used in hydrogen fuel cells (GB / T37244-2018). The hydrogen is then compressed in a hydrogen compressor, reaching a pressure of up to 20 MPa, before entering the filling area for long-tube trucks and containerized tanks, and finally delivered to hydrogen refueling stations or other users.

[0004] like Figure 1 As shown: The feed gas is connected to the PSA unit inlet via feed gas pipeline 1. The desorbed gas outlet of PSA unit 2 is connected to fuel gas pipeline 8, and the fuel gas is sent to the fuel gas network. The product gas outlet of the PSA unit is connected to one end of the product gas main pipe 3, and the other end of the product gas main pipe 3 is connected to the compressor 4 inlet. An online pressure gauge PI1 is installed on the compressor inlet on the product gas main pipe 3. On the side near compressor 4, a return pipeline 10 is connected to the compressor outlet pipeline 11 and the product gas main pipe 3. A return regulating valve 9 is installed on the return pipeline 10. The compressor outlet pipeline 11 is connected to one end of the charging hose 6 via the charging hand valve 5, and the other end of the charging hose is connected to the long-tube truck 7.

[0005] There are currently two types of pressure swing adsorption (PSA) devices on the market: traditional PSA and new PSA. The main difference between the two is that traditional PSA uses multiple programmable valves for control, while new PSA uses only one rotary valve (light valve 13 and heavy valve 14) instead of multiple programmable valves for control. Compared with traditional PSA, it has the advantages of smaller footprint, lower investment, and higher degree of automation, which has led to its rapid market dominance.

[0006] The new PSA, taking a six-tower configuration as an example, such as... Figure 2As shown: the raw material gas pipeline 1 is connected to the first port of the heavy valve 14. The six ports of the heavy valve 14 are respectively connected to the bottom of the adsorption tower 12 through the bottom branch pipeline 16 of the adsorption tower. The eighth port of the heavy valve 14 is connected to the fuel gas pipeline 8, and the fuel gas is discharged to the fuel gas network. The top of the adsorption tower 12 is connected to the six ports of the light valve 13 through the top branch pipeline 15 of the adsorption tower. The seventh port of the light valve 13 is connected to the product gas pipeline 3.

[0007] In normal production, pressure swing adsorption (PSA) units can regenerate the adsorbent to acceptable quality through processes such as pressure reduction and purging. However, sometimes strong impurities accumulate gradually, or during high-load operation, impurities or heavy components and polar substances can penetrate the adsorbent's pores, making them difficult to remove at normal temperatures. This leads to a decrease in adsorption capacity, a significant drop in product recovery rate, and increased production costs. The reasons for contaminant penetration into the adsorption tower include:

[0008] 1. The different adsorbent filling amounts in each adsorption tower of the pressure swing adsorption unit can cause insufficient gas production in some adsorption towers, which can easily lead to overload of some adsorption towers and penetration of the adsorption towers by pollutants.

[0009] 2. Due to production needs, the system operates under overload conditions, causing pollutants to accumulate slowly, and the adsorption tower is penetrated by the pollutants.

[0010] 3. The polar molecules (such as water) in the feed gas have a very strong adsorption capacity, and pressure reduction purging is not enough to completely regenerate them. Long-term operation will lead to deactivation of the adsorbent.

[0011] There are currently two ways to deal with adsorbent deactivation: The first is to remove the adsorbent from the adsorption tower and replace it with a new one. This method involves long downtime, high costs, and high labor costs. The second method is to use hot nitrogen purging and replacement. This method generally uses low-pressure nitrogen as the purging gas. However, since low-pressure nitrogen often contains trace amounts of water, carbon dioxide, oxygen, and other impurities, the adsorbent regeneration effect is poor. Furthermore, after regeneration and re-entry, since the system is entirely composed of nitrogen, hydrogen is required for replacement until the product gas is qualified. This not only results in long start-up times but also leads to significant waste due to the venting of unqualified product gas. Summary of the Invention

[0012] The purpose of this invention is to overcome the shortcomings of the prior art and provide a hydrogen purification system and method with self-healing function. By using product hydrogen as the regeneration gas, the system replacement problem caused by using nitrogen for regeneration is effectively avoided, and the replacement problem after regeneration is avoided, thus accelerating the time to production.

[0013] The technical solution of this invention is:

[0014] The first aspect of this invention is to provide a hydrogen purification system with self-repairing function. The raw material gas is connected to the first port of a heavy valve via a raw material gas pipeline. The six ports of the heavy valve are respectively connected to the bottom of the adsorption tower via branch pipelines at the bottom of the adsorption tower. The system is characterized by the installation of bottom branch valves on the bottom branch pipelines of the adsorption tower. One end of a regeneration gas outlet branch pipeline is connected to each bottom branch valve and the adsorption tower. The other end of the regeneration gas outlet branch pipeline is connected to one end of a regeneration gas outlet main pipe. A regeneration gas outlet branch valve and a regeneration gas outlet online temperature gauge TI1 are sequentially installed on the regeneration gas outlet branch pipelines. A fuel gas pipeline is connected to the other end of the regeneration gas outlet main pipe. The eighth port of the heavy valve is connected to the fuel gas pipeline, and the fuel gas is discharged to the fuel gas network. A regeneration gas outlet manual valve is installed on the regeneration gas outlet main pipe. The top of the adsorption tower is connected to the six ports of a light valve via branch pipelines at the top of the adsorption tower. A branch valve at the top of the adsorption tower is installed on the branch pipeline. The seventh port of the light valve is connected to one end of the product gas main pipe. One end of the regenerated gas inlet main pipe is connected to the product gas main pipe. The other end of the regenerated gas inlet main pipe is connected to one end of the regenerated gas inlet branch pipe. A regenerated gas inlet manual valve, a regenerated gas inlet regulating valve FV1, an online flow meter FIC1, a heater, and a regenerated gas online inlet temperature meter TIC1 are installed sequentially on the regenerated gas inlet main pipe. The other end of the regenerated gas inlet branch pipe is connected to the top port of each of the six adsorption towers. A regenerated gas inlet branch pipe manual valve is installed on each regenerated gas inlet branch pipe. The other end of the product gas main pipe is connected to the compressor inlet. An online pressure gauge PI1 for the compressor inlet is installed on the product gas main pipe. On the side near the compressor, a return pipeline is connected to the compressor outlet pipeline and the product gas main pipe. A return regulating valve is installed on the return pipeline. The compressor outlet pipeline is connected to one end of the charging hose through a charging manual valve. The other end of the charging hose is connected to the long tube truck.

[0015] Furthermore, the online flow meter FIC1, the online inlet temperature meter TIC1, and the online outlet temperature meter TI1 of the regenerated gas are connected to the controller KY1 via cables.

[0016] Furthermore, the controller KY1 controls the regeneration effect according to a certain heating or cooling rate and a certain regeneration gas flow rate.

[0017] The second aspect of the present invention is to provide a purification method for the hydrogen purification system with self-repair function, characterized in that when the adsorbent adsorption effect decreases, manifested as a decrease in recovery rate, excessive hydrogen index of the product, or a decrease in production load, the self-repair system is activated, the light valve and heavy valve are stopped, the top branch valve and bottom branch valve of the adsorption tower are closed, the compressor is stopped, the charging hand valve is opened, and the hydrogen in the long tube truck enters the compressor outlet pipeline through the charging hose. The hydrogen pressure is adjusted to 0.1-0.3 MPa by the reflux regulating valve, and the adjusted hydrogen enters the product gas main pipe to provide a hydrogen source for adsorbent regeneration. The regeneration gas inlet hand valve, the regeneration gas inlet branch pipe hand valve, the regeneration gas outlet branch valve, and the regeneration gas outlet hand valve are opened, and the regeneration flow rate and temperature are controlled by the controller KY1 to perform the self-repair operation.

[0018] The self-healing process is as follows:

[0019] Heating of S1 adsorbent: The hydrogen pressure is monitored by the online pressure gauge PI1 at the compressor inlet, maintaining it at 0.1-0.3 MPa. The total hydrogen flow rate is controlled at 3000 Nm³ by the controller KY1. 3 / h, the heater temperature is controlled by the online inlet temperature gauge TIC1 of the regenerated gas, and the temperature is increased at a rate of 25-30℃ / h according to the hydrogen heating rate, until the online inlet temperature gauge TIC1 of the regenerated gas reaches 110℃ and then the temperature is maintained until the temperature of the online outlet temperature gauge TI1 of the regenerated gas of each adsorption tower is greater than 90℃. Then the controller KY1 starts timing for 3-5 hours. After timing for 3-5 hours, the adsorbent cooling step is started.

[0020] Cooling of S2 adsorbent: The total hydrogen flow rate is controlled at 4000 Nm³ using controller KY1. 3 The heater temperature is controlled by the online inlet temperature gauge TIC1 of the regenerated gas. The temperature is increased at a rate of 25-30℃ / h according to the cooling rate of hydrogen. The temperature is maintained at 30℃ by the online inlet temperature gauge TIC1 of the regenerated gas until the temperature of the online outlet temperature gauge TI1 of each adsorption tower is less than 35℃. Then the controller KY1 starts timing for 2-4 hours. After timing for 2-4 hours, the adsorbent regeneration is completed.

[0021] The self-healing hydrogen purification system of this invention is also applicable to traditional PSA devices.

[0022] The advantages and positive effects of this invention are:

[0023] 1. This invention uses product hydrogen as the regeneration gas, which effectively avoids the system replacement problem caused by using nitrogen for regeneration, avoids the replacement problem after regeneration, and speeds up the production time.

[0024] 2. This invention independently designs a self-repairing system on the original hydrogen purification device. When the adsorption effect of the adsorbent decreases, the product gas in the long tube can be directly returned to the PSA system for regeneration. The operation is simple, the regeneration time is short, and the adverse effects on downstream customers caused by product supply interruption are reduced.

[0025] 3. This invention connects the regenerated outlet main pipe to the fuel gas pipeline, allowing the regenerated hydrogen to enter the fuel gas network, thus avoiding the waste of product gas and reducing regeneration costs.

[0026] 4. This invention uses the existing long-tube truck as the air source. Since the pressure of the long-tube truck is very high, the pressure can be adjusted by the reflux regulating valve, and the pressure can be monitored by the online pressure gauge PI1 at the compressor inlet to ensure pressure stability.

[0027] 5. This invention uses the existing long-tube vehicle as the gas source and makes full use of existing on-site resources for regeneration, which reduces investment costs, avoids compliance issues related to placing the long-tube vehicle on-site, and ensures the safety of hydrogen use during the regeneration process.

[0028] 6. This invention automatically controls the regeneration process by connecting the signals from the online flow meter FIC1, the online inlet temperature meter TIC1, and the online outlet temperature meter TI1 to the controller KY1, ensuring the quality of regeneration and preventing the adsorbent from pulverizing due to excessively rapid heating or cooling, which would affect the adsorbent's lifespan.

[0029] 7. The present invention uses a controller KY1 to automatically control the adsorbent regeneration process, which saves time and effort, reduces labor intensity, and ensures regeneration effect. Attached Figure Description

[0030] Figure 1 Material flow diagram of normal production at the hydrogenation mother station;

[0031] Figure 2 Flowchart of the original novel PSA;

[0032] Figure 3 Material flow diagram during PSA self-healing process;

[0033] Figure 4 : The modified new PSA flowchart.

[0034] Among them: 1-Raw gas pipeline, 2-PSA unit, 3-Product gas main pipeline, 4-Compressor, 5-Filling hand valve, 6-Filling hose, 7-Long pipeline vehicle, 8-Fuel gas pipeline, 9-Recirculation regulating valve, 10-Recirculation pipeline, 11-Compressor outlet pipeline, 12-Adsorption tower, 13-Light valve, 14-Heavy valve, 15-Top branch pipeline of adsorption tower, 16-Bottom branch pipeline of adsorption tower, 17-Heater, 18-Top branch valve of adsorption tower, 19-Bottom branch valve of adsorption tower, 20-Re- 21 - Regenerated gas inlet branch pipe, 22 - Regenerated gas outlet branch pipe, 23 - Regenerated gas outlet branch valve, 24 - Regenerated gas inlet main pipe, 25 - Regenerated gas inlet manual valve, 26 - Regenerated gas outlet main pipe, 27 - Regenerated gas outlet manual valve, PI1 - Compressor inlet online pressure gauge, TIC1 - Regenerated gas online inlet temperature gauge, FV1 - Regenerated gas inlet regulating valve, FIC1 - Online flow meter, TI1 - Regenerated gas outlet online temperature gauge, KY1 - Controller. Detailed Implementation

[0035] The present invention will be further described in detail below through specific embodiments. The following embodiments are merely descriptive and not limiting, and should not be used to limit the scope of protection of the present invention.

[0036] like Figure 4The hydrogen purification system shown, with self-healing capabilities, taking a novel PSA as an example, has the following process flow: The feed gas is connected to the first port of a heavy valve 14 via feed gas pipeline 1. The six ports of the heavy valve 14 are connected to the bottom of the adsorption tower 12 via bottom branch pipelines 16. Bottom branch valves 19 are installed on the bottom branch pipelines 16. One end of a regeneration gas outlet branch pipeline 22 is connected to each bottom branch valve 19 and the adsorption tower 12 via the bottom branch pipeline 16, and the other end is connected to one end of the regeneration gas outlet main pipe 26. A regeneration gas outlet branch valve 23 and a regeneration gas outlet online temperature gauge TI1 are installed sequentially on the regeneration gas outlet branch pipelines 22. The other end of the regeneration gas outlet main pipe 26 is connected to a fuel gas pipeline 8. The eighth port of the heavy valve 14 is connected to the fuel gas pipeline 8, and the fuel gas is discharged to the fuel gas network. Install a regenerated gas outlet manual valve 27 on the regenerated gas outlet main pipe 26; the top of the adsorption tower 12 is connected to the six ports of the light valve 13 through the adsorption tower top branch pipe 15, and an adsorption tower top branch valve 18 is installed on the adsorption tower top branch pipe 15. The seventh port of the light valve 13 is connected to one end of the product gas main pipe 3, and one end of the regenerated gas inlet main pipe 24 is connected to the product gas main pipe 3. The other end of the regenerated gas inlet main pipe 24 is connected to one end of the regenerated gas inlet branch pipe 20. Install a regenerated gas inlet manual valve 25, a regenerated gas inlet regulating valve FV1, an online flow meter FIC1, a heater 17, and a regenerated gas online inlet temperature meter TIC1 on the regenerated gas inlet main pipe 24 in sequence. The other end of the regenerated gas inlet branch pipe 20 is connected to the top ports of the six adsorption towers 12, and a regenerated gas inlet branch pipe manual valve 21 is installed on each of the regenerated gas inlet branch pipes 20.

[0037] The other end of the product gas main pipe 3 is connected to the inlet of the compressor 4. An online pressure gauge PI1 for the compressor inlet is installed on the product gas main pipe 3. On the side near the compressor 4, a return line 10 is connected to the compressor outlet line 11 and the product gas main pipe 3. A return regulating valve 9 is installed on the return line 10. The compressor outlet line 11 is connected to one end of the charging hose 6 via the charging hand valve 5. The other end of the charging hose 6 is connected to the long tube trolley 7.

[0038] The online flow meter FIC1, the online inlet temperature meter TIC1, and the online outlet temperature meter TI1 are connected to the controller KY1 via cables. The controller controls the regeneration effect according to a certain heating or cooling rate and a certain regeneration gas flow rate.

[0039] A hydrogen purification method with self-healing function includes the following steps:

[0040] (1) When the adsorbent is normal and the device is in normal production, close the regeneration gas inlet manual valve 25, the regeneration gas inlet branch pipe manual valve 21, the regeneration gas outlet branch valve 23, and the regeneration gas outlet manual valve 27. Open the top branch valve 18 and the bottom branch valve 19 of the adsorption tower. Start the light valve 13 and the heavy valve 14. The raw material enters the adsorption tower 12 through the heavy valve 14. The impurity gas after the adsorption tower is desorbed is discharged to the fuel gas network through the fuel gas pipeline. The purified hydrogen is sent to the inlet of the compressor 4 through the light valve 13. Start the compressor 4, close the reflux regulating valve 9, compress the hydrogen to 20MPa, connect the charging hose 6, open the charging manual valve 5, and the compressed hydrogen enters the long tube car 7 for filling through the charging hose 6. When the pressure of the long tube car 7 reaches 20MPa, close the charging manual valve 5, remove the charging hose 6, and replace it with another long tube car 7 to continue filling according to the above steps.

[0041] (2) When the adsorption effect of the adsorbent decreases, manifested as a decrease in recovery rate, excessive hydrogen content in the product, or a decrease in production load, the self-repair system can be activated. Stop light valve 13 and heavy valve 14, as these valves have built-in heat-sensitive sealing gaskets. Close the top branch valve 18 and bottom branch valve 19 of the adsorption tower. Stop compressor 4. Figure 3 As shown, opening the charging hand valve 5 allows hydrogen from the long tube 7 to enter the compressor outlet line 11 through the charging hose 6. The hydrogen pressure is adjusted to 0.1-0.3 MPa via the reflux regulating valve 9. The pressure is monitored by the compressor inlet online pressure gauge PI1. The adjusted hydrogen then enters the product gas main line 3, providing a hydrogen source for adsorbent regeneration. Opening the regeneration gas inlet hand valve 25, regeneration gas inlet branch pipe hand valve 21, regeneration gas outlet branch valve 23, and regeneration gas outlet hand valve 27 allows the controller KY1 to control the regeneration flow rate and temperature for self-repair. This self-repair process is program-controlled.

[0042] (3) The self-repair process is as follows:

[0043] 1) Heating of the adsorbent

[0044] The hydrogen pressure is monitored by the online pressure gauge PI1 at the compressor inlet, maintaining it at 0.1-0.3 MPa. The total hydrogen flow rate is controlled at 3000 Nm³ by the controller KY1. 3 The temperature of heater 17 is controlled by the online inlet temperature gauge TIC1 of the regenerated gas, and the temperature is increased at a rate of 25-30℃ / h according to the hydrogen heating rate, until the online inlet temperature gauge TIC1 of the regenerated gas reaches 110℃, and then this temperature is maintained until the temperature of the online outlet temperature gauge TI1 of each adsorption tower is greater than 90℃. Then the controller KY1 starts timing for 4 hours. After timing for 4 hours, the adsorbent cooling step begins.

[0045] 2) Cooling of the adsorbent

[0046] The total hydrogen flow rate is controlled at 4000 Nm using controller KY1. 3 The temperature of heater 17 is controlled by the online inlet temperature gauge TIC1 of the regeneration gas, and the temperature is increased at a rate of 25-30℃ / h according to the cooling rate of hydrogen, until the online inlet temperature gauge TIC1 of the regeneration gas reaches 30℃, and then maintained at this temperature. The temperature is maintained until the online outlet temperature gauge TI1 of the regeneration gas in each adsorption tower is less than 35℃, at which point controller KY1 starts timing for 3 hours. After 3 hours of timing, the adsorbent regeneration is complete.

[0047] 3) Adsorption tower recovery

[0048] To put the PSA into operation, follow the steps (1) above.

[0049] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the inventive concept, and these all fall within the protection scope of the present invention.

Claims

1. A hydrogen purification system with self-repairing function, wherein the raw gas is connected to the first port of a heavy valve via a raw gas pipeline, and the six ports of the heavy valve are respectively connected to the bottom of the adsorption tower via branch pipelines at the bottom of the adsorption tower, characterized in that, Install bottom branch valves on the bottom branch lines of the adsorption tower. Connect one end of the regenerated gas outlet branch line to each bottom branch valve and the adsorption tower. Connect the other end of the regenerated gas outlet branch line to one end of the regenerated gas outlet main pipe. Install a regenerated gas outlet branch valve and a regenerated gas outlet online temperature gauge TI1 on the regenerated gas outlet branch lines. Connect the other end of the regenerated gas outlet main pipe to the fuel gas pipeline. Connect the eighth port of the heavy valve to the fuel gas pipeline. Discharge the fuel gas to the fuel gas network. Install a regenerated gas outlet manual valve on the regenerated gas outlet main pipe. The top of the adsorption tower is connected through the top branch line of the adsorption tower. The lines are connected to the six ports of the light valve respectively. The top branch valve of the adsorption tower is installed on the branch pipeline at the top of the adsorption tower. The seventh port of the light valve is connected to one end of the product gas main pipe. One end of the regenerated gas inlet main pipe is connected to the product gas main pipe. The other end of the regenerated gas inlet main pipe is connected to one end of the regenerated gas inlet branch pipe respectively. The regenerated gas inlet manual valve, regenerated gas inlet regulating valve FV1, online flow meter FIC1, heater, and regenerated gas online inlet temperature meter TIC1 are installed sequentially on the regenerated gas inlet main pipe. The other end of the regenerated gas inlet branch pipe is connected to the top port of the six adsorption towers respectively. The regenerated gas inlet branch pipe manual valve is installed on each regenerated gas inlet branch pipe. The other end of the product gas main pipe is connected to the compressor inlet. An online pressure gauge PI1 for the compressor inlet is installed on the product gas main pipe. On the side near the compressor, the compressor outlet pipe and the product gas main pipe are connected through a return line. A return regulating valve is installed on the return line. The compressor outlet pipe is connected to one end of the charging hose through the charging hand valve. The other end of the charging hose is connected to the long tube truck.

2. The hydrogen purification system with self-healing function according to claim 1, characterized in that, The online flow meter FIC1, the online inlet temperature meter TIC1, and the online outlet temperature meter TI1 of the regenerated gas are connected to the controller KY1 via cables.

3. The hydrogen purification system with self-healing function according to claim 2, characterized in that, The controller KY1 controls the regeneration effect according to a certain heating or cooling rate and a certain regeneration gas flow rate.

4. A purification method for a hydrogen purification system with self-repairing function according to any one of claims 1 to 3, characterized in that, When the adsorbent adsorption effect decreases, manifested as a decrease in recovery rate, excessive hydrogen index in the product, or a decrease in production load, the self-repair system is activated. The light and heavy valves are stopped, the top and bottom branch valves of the adsorption tower are closed, the compressor is shut down, and the charging hand valve is opened. Hydrogen in the long-tube vehicle enters the compressor outlet pipeline through the charging hose. The hydrogen pressure is adjusted to 0.1-0.3 MPa through the reflux regulating valve. The adjusted hydrogen enters the product gas main pipeline, providing a hydrogen source for adsorbent regeneration. The regeneration gas inlet hand valve, regeneration gas inlet branch pipe hand valve, regeneration gas outlet branch valve, and regeneration gas outlet hand valve are opened. The regeneration flow rate and temperature are controlled by controller KY1 to perform the self-repair operation.

5. The purification method according to claim 4, characterized in that, The self-healing process is as follows: Heating of S1 adsorbent: The hydrogen pressure is monitored by the online pressure gauge PI1 at the compressor inlet, maintaining it at 0.1-0.3 MPa. The total hydrogen flow rate is controlled at 3000 Nm³ by the controller KY1. 3 / h, the heater temperature is controlled by the online inlet temperature gauge TIC1 of the regenerated gas, and the temperature is increased at a rate of 25-30℃ / h according to the hydrogen heating rate, until the online inlet temperature gauge TIC1 of the regenerated gas reaches 110℃ and then the temperature is maintained until the temperature of the online outlet temperature gauge TI1 of the regenerated gas of each adsorption tower is greater than 90℃. Then the controller KY1 starts timing for 3-5 hours. After timing for 3-5 hours, the adsorbent cooling step is started. Cooling of S2 adsorbent: The total hydrogen flow rate is controlled at 4000 Nm³ using controller KY1. 3 The heater temperature is controlled by the online inlet temperature gauge TIC1 of the regenerated gas. The temperature is increased at a rate of 25-30℃ / h according to the cooling rate of hydrogen. The temperature is maintained at 30℃ by the online inlet temperature gauge TIC1 of the regenerated gas until the temperature of the online outlet temperature gauge TI1 of each adsorption tower is less than 35℃. Then the controller KY1 starts timing for 2-4 hours. After timing for 2-4 hours, the adsorbent regeneration is completed.

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