Hydrogen purification system with self-repairing function and purification method

Abstract

The invention belongs to the field of hydrogen energy, and particularly relates to a hydrogen purification system with a self-repairing function and a purification method. The product hydrogen is used as the regeneration gas, and when the adsorption effect of the adsorbent is reduced, the product gas in the long pipe vehicle can be directly returned to the PSA system for regeneration operation, so that the problem of system replacement caused by regeneration by using nitrogen is effectively avoided, the problem of replacement after regeneration is avoided, and the production time is shortened.

Description

Technical Field

[0001] The present invention belongs to the field of hydrogen energy, relates to a hydrogenation mother station, and in particular to a hydrogen purification system and a purification method with a self-repairing function. Background Art

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

[0003] The general process flow of the hydrogen refueling station is as follows: the industrial byproduct hydrogen from chemical enterprises is first purified by the hydrogen purification device (PSA). The purity (molar fraction) of the purified hydrogen can reach 99.999% or above, and at the same time meet the requirements of high-purity hydrogen index (GB / T 3634.2-2011) and hydrogen quality index requirements for hydrogen fuel cells (GB / T37244-2018). After that, it enters the hydrogen compressor for compression, compressing the hydrogen pressure to a maximum of 20MPa, and enters the filling area to fill long-tube trucks and containers, and then sent to hydrogen refueling stations or other users.

[0004] like Figure 1 As shown: the raw gas is connected to the inlet of the PSA device through the raw gas pipeline 1, the outlet of the analytical gas generated by the PSA device 2 is connected to the fuel gas pipeline 8, and the fuel gas is sent to the fuel gas pipeline network. The product gas outlet of the PSA device 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 inlet of the compressor 4. The compressor inlet online pressure gauge PI1 is installed on the product gas main pipe 3. On the side close to the compressor 4, it is connected to the compressor outlet pipeline 11 and the product gas main pipe 3 through the return pipeline 10, and the return regulating valve 9 is installed on the return pipeline 10. The compressor outlet pipeline 11 is connected to one end of the filling hose 6 through the filling manual valve 5, and the other end of the filling hose is connected to the long tube truck 7.

[0005] There are two types of pressure swing adsorption devices on the market, one is traditional PSA and the other is new PSA. The main difference between the two is that traditional PSA is controlled by multiple programmable valves, while the new PSA only uses a set of rotary valves (light valve 13 and heavy valve 14) to replace multiple programmable valves for control. Compared with traditional PSA, it has the characteristics of small footprint, low investment, high degree of automation, etc. and quickly occupied the market.

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

[0007] In normal production, the pressure swing adsorption device can regenerate the adsorbent to a qualified level by processes such as pressure reduction and purging. However, sometimes some impurities with strong adsorption gradually accumulate, or when running at high load, impurity components penetrate or heavy components and polar substances enter the pores of the adsorbent, which are difficult to remove at normal temperature, resulting in a decrease in adsorption capacity, a significant decrease in product recovery, and increased production costs. The reasons for the penetration of pollutants in the adsorption tower are:

[0008] 1. The adsorbent filling amount of each adsorption tower of the pressure swing adsorption device is different, resulting in insufficient gas production in some adsorption towers, which can easily cause some adsorption towers to be overloaded and penetrated by pollutants.

[0009] 2. Due to production needs, the plant operates at overload, causing pollutants to accumulate slowly and the adsorption tower to be penetrated by pollutants.

[0010] 3. The polar molecules (such as water) in the raw gas have a strong adsorption capacity, and the pressure reduction and purge are not enough for complete regeneration. Long-term operation will cause the adsorbent to deactivate.

[0011] When the adsorbent is deactivated, there are currently two treatments: the first treatment is to unload the adsorbent from the adsorption tower and replace it with a new one. This solution has a long downtime, high cost and high labor cost; the other treatment is to use hot nitrogen purge replacement. This solution generally uses low-pressure nitrogen as the purge gas, but because low-pressure nitrogen is often mixed with trace amounts of water, carbon dioxide, oxygen and other impurities, the adsorbent regeneration effect is poor, and after regeneration, it is put into use. Since the system is full of nitrogen, hydrogen is also needed for replacement until the product gas is qualified. This not only takes a long time to start production, but the produced product gas is vented due to unqualified conditions, resulting in great waste. Summary of the invention

[0012] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a hydrogen purification system and purification method with self-repairing function, which uses product hydrogen as regeneration gas, effectively avoids the system replacement problem caused by using nitrogen regeneration, avoids the replacement problem after regeneration, and speeds up the production time.

[0013] The technical solution of the present invention is:

[0014] The first aspect of the present invention is to provide a hydrogen purification system with a self-repairing function, wherein the raw gas is connected to the first interface of the heavy valve through the raw gas pipeline, and the six interfaces of the heavy valve are respectively connected to the bottom of the adsorption tower through the branch pipeline at the bottom of the adsorption tower. It is characterized in that the bottom branch valves of the adsorption tower are respectively installed on the branch pipeline at the bottom of the adsorption tower, and one end of the regeneration gas outlet branch pipeline is connected to the bottom branch pipeline of the adsorption tower between each bottom branch valve of the adsorption tower and the adsorption tower, and the other end of the regeneration gas outlet branch pipeline is connected to one end of the regeneration gas outlet main pipe. The regeneration gas outlet branch valve and the regeneration gas outlet online temperature meter TI1 are respectively installed on the regeneration gas outlet branch pipeline in sequence, and the fuel gas pipeline is connected to the other end of the regeneration gas outlet main pipe. The eighth interface of the heavy valve is connected to the fuel gas pipeline, and the fuel gas is discharged to the fuel gas pipeline network, and a regeneration gas outlet manual valve is installed on the regeneration gas outlet main pipe; the top of the adsorption tower is respectively connected to the six interfaces of the light valve through the branch pipeline at the top of the adsorption tower, and 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 interface of the light valve is connected to one end of the product gas main pipe, one end of the regeneration gas inlet main pipe is connected to the product gas main pipe, and the other end of the regeneration gas inlet main pipe is connected to one end of the regeneration gas inlet branch pipe respectively. The regeneration gas inlet manual valve, regeneration gas inlet regulating valve FV1, online flow meter FIC1, heater, regeneration gas online inlet temperature meter TIC1 are installed on the regeneration gas inlet main pipe in sequence, the other end of the regeneration gas inlet branch pipe is connected to the top interface of the six adsorption towers respectively, and a regeneration gas inlet branch pipe manual valve is installed on each regeneration gas inlet branch pipe; the other end of the product gas main pipe is connected to the compressor inlet, and the compressor inlet online pressure gauge PI1 is installed on the product gas main pipe. On the side close to the compressor, it is connected to the compressor outlet pipeline and the product gas main pipe through the reflux pipeline, and a reflux regulating valve is installed on the reflux pipeline. The compressor outlet pipeline is connected to one end of the charging hose through the charging hose manual valve, and the other end of the charging hose is connected to the long tube truck.

[0015] Furthermore, the online flow meter FIC1, the online regeneration gas inlet temperature meter TIC1 and the online regeneration gas outlet temperature meter TI1 connect signals to the controller KY1 through 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 provides a purification method for a hydrogen purification system with a self-repairing function, which is characterized in that when the adsorption effect of the adsorbent decreases, which is manifested as a decrease in the recovery rate, an excess of the product hydrogen index, or a decrease in the production load, the self-repairing system is started, the light valve and the heavy valve are stopped, the top branch valve of the adsorption tower and the bottom branch valve of the adsorption tower are closed, the compressor is disabled, the filling car manual valve is opened, and the hydrogen in the long-tube car enters the compressor outlet pipeline through the filling car hose, and the hydrogen pressure is adjusted to 0.1-0.3MPa through the reflux regulating valve. The adjusted hydrogen enters the product gas main pipe to provide a hydrogen gas source for adsorbent regeneration, and the regeneration gas inlet manual valve, the regeneration gas inlet branch pipe manual valve, the regeneration gas outlet branch valve, and the regeneration gas outlet manual valve are opened, and the regeneration flow and temperature are controlled by the controller KY1 to perform self-repair work.

[0018] The self-repair working steps are:

[0019] S1 adsorbent temperature rise: The hydrogen pressure is monitored by the compressor inlet online pressure gauge PI1 to keep the hydrogen pressure at 0.1-0.3MPa, and the total hydrogen flow rate is controlled at 3000Nm through the controller KY1 3 / h, the heater temperature is controlled by the regeneration gas online inlet temperature table TIC1, and the temperature is increased between 25-30℃ / h according to the heating rate of hydrogen, until the regeneration gas online inlet temperature table TIC1 is heated to 110℃ and then the temperature is maintained until the temperature of the regeneration gas outlet online temperature table TI1 of each adsorption tower is greater than 90℃, the controller KY1 starts timing for 3-5 hours, and after timing for 3-5 hours, it enters the adsorbent cooling step;

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

[0021] The hydrogen purification system with self-repairing function of the present invention is also applicable to conventional PSA devices.

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

[0023] 1. The present 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. The present 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 car can be directly returned to the PSA system for regeneration. The operation is simple and the regeneration time is short, which reduces the adverse effects on downstream customers caused by product supply interruption.

[0025] 3. The present invention connects the regeneration outlet main pipe with the fuel gas pipeline, so that the regenerated hydrogen enters the fuel gas pipeline network, avoiding the waste of product gas and reducing the regeneration cost.

[0026] 4. The present invention adopts the original long tube truck as the gas 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 is monitored by the compressor inlet online pressure gauge PI1 to ensure the stability of the pressure.

[0027] 5. The present invention adopts the original long-tube vehicle as the gas source and makes full use of the existing resources on site for regeneration, which reduces the investment cost, avoids the compliance problem of placing the long-tube vehicle on site, and ensures the safety of hydrogen use during the regeneration process.

[0028] 6. The present invention can automatically control the regeneration process by leading the signals of the online flow meter FIC1, the online inlet temperature meter TIC1 of the regeneration gas, and the online outlet temperature meter TI1 of the regeneration gas to the controller KY1, thereby ensuring the quality of regeneration and avoiding the adsorbent from being powdered due to excessively rapid heating or cooling, thereby affecting the service life of the adsorbent.

[0029] 7. The present invention adopts controller KY1 to automatically control the adsorbent regeneration process, which saves time and effort, reduces labor intensity, and ensures the regeneration effect. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0031] Figure 2 :Flowchart of the original new PSA;

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

[0033] Figure 4 : Flow chart of the new PSA after modification.

[0034] Among them: 1-raw gas pipeline, 2-PSA device, 3-product gas main, 4-compressor, 5-charging car manual valve, 6-charging car hose, 7-long tube car, 8-fuel gas pipeline, 9-reflux regulating valve, 10-reflux pipeline, 11-compressor outlet pipeline, 12-adsorption tower, 13-light valve, 14-heavy valve, 15-adsorption tower top branch pipeline, 16-adsorption tower bottom branch pipeline, 17-heater, 18-adsorption tower top branch valve, 19-adsorption tower bottom branch valve, 20-re Gas inlet branch pipe, 21-regeneration gas inlet branch pipe manual valve, 22-regeneration gas outlet branch pipeline, 23-regeneration gas outlet branch valve, 24-regeneration gas inlet main pipe, 25-regeneration gas inlet manual valve, 26-regeneration gas outlet main pipe, 27-regeneration gas outlet manual valve, PI1-compressor inlet online pressure gauge, TIC1-regeneration gas online inlet temperature gauge, FV1-regeneration gas inlet regulating valve, FIC1-online flow meter, TI1-regeneration gas outlet online temperature gauge, KY1-controller. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below through specific examples. The following examples are only illustrative and not restrictive, and the protection scope of the present invention cannot be limited thereto.

[0036] like Figure 4A hydrogen purification system with self-repairing function is shown, taking the new PSA as an example, and its process flow is as follows: the raw gas is connected to the first interface of the heavy valve 14 through the raw gas pipeline 1, and the six interfaces of the heavy valve 14 are respectively connected to the bottom of the adsorption tower 12 through the adsorption tower bottom branch pipeline 16, and the adsorption tower bottom branch valve 19 is installed on the adsorption tower bottom branch pipeline 16 respectively, and one end of the regeneration gas outlet branch pipeline 22 is connected to the adsorption tower bottom branch pipeline 16 between each adsorption tower bottom branch valve 19 and the adsorption tower 12, and the other end is connected to one end of the regeneration gas outlet main pipe 26, and the regeneration gas outlet branch valve 23 and the regeneration gas outlet online temperature meter TI1 are installed on the regeneration gas outlet branch pipeline 22 in sequence, and the other end of the regeneration gas outlet main pipe 26 is connected to the fuel gas pipeline 8, and the eighth interface of the heavy valve 14 is connected to the fuel gas pipeline 8, and the fuel gas is discharged to the fuel gas pipeline network. A regeneration gas outlet manual valve 27 is installed on the regeneration gas outlet main pipe 26; the top of the adsorption tower 12 is connected to the six interfaces of the light valve 13 through the adsorption tower top branch pipeline 15, and the adsorption tower top branch valve 18 is installed on the adsorption tower top branch pipeline 15; the seventh interface of the light valve 13 is connected to one end of the product gas main pipe 3, and one end of the regeneration gas inlet main pipe 24 is connected to the product gas main pipe 3, and the other end of the regeneration gas inlet main pipe 24 is connected to one end of the regeneration gas inlet branch pipe 20, respectively; the regeneration gas inlet manual valve 25, the regeneration gas inlet regulating valve FV1, the online flow meter FIC1, the heater 17, and the regeneration gas online inlet temperature meter TIC1 are installed on the regeneration gas inlet main pipe 24 in sequence; the other end of the regeneration gas inlet branch pipe 20 is respectively connected to the top interface of the six adsorption towers 12, and a regeneration gas inlet branch pipe manual valve 21 is installed on each of the regeneration 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. The compressor inlet online pressure gauge PI1 is installed on the product gas main pipe 3. On the side close to the compressor 4, it is connected to the compressor outlet pipeline 11 and the product gas main pipe 3 through the return pipeline 10. The 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 through the charging hand valve 5, and the other end of the charging hose 6 is connected to the long tube truck 7.

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

[0039] A method for purifying hydrogen with self-repairing function comprises 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 adsorption tower top branch valve 18 and the adsorption tower bottom branch valve 19, start the light valve 13 and the heavy valve 14, and the raw material enters the adsorption tower 12 through the heavy valve 14. The impurity gas analyzed by the adsorption tower is discharged to the fuel gas pipeline network through the fuel gas pipeline. The purified hydrogen is sent to the compressor 4 inlet through the light valve 13, and the compressor 4 is started. The reflux regulating valve 9 is closed to compress the hydrogen to 20MPa, connect the filling hose 6, open the filling manual valve 5, and the compressed hydrogen enters the long tube truck 7 through the filling hose 6 for filling. When the pressure of the long tube truck 7 reaches 20MPa, close the filling manual valve 5, remove the filling hose 6, and replace another long tube truck 7 to continue filling according to the above steps.

[0041] (2) When the adsorption effect of the adsorbent decreases, which is manifested by a decrease in the recovery rate, an excess of the product hydrogen index, or a decrease in the production load, the self-repair system can be started. Stop the light valve 13 and the heavy valve 14. Since the light valve 13 and the heavy valve 14 have built-in sealing gaskets that are not heat-resistant, close the branch valve 18 at the top of the adsorption tower and the branch valve 19 at the bottom of the adsorption tower. Deactivate the compressor 4, such as Figure 3 As shown, open the charging manual valve 5, the hydrogen in the long tube car 7 enters the compressor outlet pipeline 11 through the charging hose 6, and the hydrogen pressure is adjusted to 0.1-0.3MPa through the reflux regulating valve 9. The pressure is monitored by the compressor inlet online pressure gauge PI1. The regulated hydrogen enters the product gas main pipe 3 to provide a hydrogen source for adsorbent regeneration. Open 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, and control the regeneration flow and temperature through the controller KY1 to perform self-repair work. The self-repair work is program controlled.

[0042] (3) The self-repair work steps are:

[0043] 1) Heating of adsorbent

[0044] The hydrogen pressure is monitored by the compressor inlet online pressure gauge PI1 to keep the hydrogen pressure at 0.1-0.3MPa. The total hydrogen flow is controlled at 3000Nm by the controller KY1. 3 / h, the temperature of the heater 17 is controlled by the online regeneration gas inlet temperature table TIC1, and the temperature is raised between 25-30℃ / h according to the heating rate of hydrogen, until the online regeneration gas inlet temperature table TIC1 is heated to 110℃ and then maintained at this temperature, until the temperature of the online regeneration gas outlet temperature table TI1 of each adsorption tower is greater than 90℃, and the controller KY1 starts timing for 4 hours. After 4 hours of timing, the adsorbent cooling step is entered.

[0045] 2) Cooling of adsorbent

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

[0047] 3) Adsorption tower recovery

[0048] Follow the above step (1) to put PSA into use.

[0049] The above description is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept, which all belong to 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 interface of the heavy valve through the raw gas pipeline, and the six interfaces of the heavy valve are respectively connected to the bottom of the adsorption tower through the branch pipelines at the bottom of the adsorption tower, characterized in that: The bottom branch valves of the adsorption towers are respectively installed on the bottom branch pipelines of the adsorption towers. One end of the regeneration gas outlet branch pipeline is connected to the bottom branch pipeline of the adsorption tower between each bottom branch valve of the adsorption tower and the adsorption tower. The other end of the regeneration gas outlet branch pipeline is connected to one end of the regeneration gas outlet main pipe. The regeneration gas outlet branch valves and the regeneration gas outlet online temperature meter TI1 are respectively installed on the regeneration gas outlet branch pipelines in sequence. The fuel gas pipeline is connected to the other end of the regeneration gas outlet main pipe. The eighth interface of the heavy valve is connected to the fuel gas pipeline. The fuel gas is discharged to the fuel gas pipeline network. The regeneration gas outlet hand valve is installed on the regeneration gas outlet main pipe. The top of the adsorption tower is connected to the top branch pipe of the adsorption tower. The lines are respectively connected to the six interfaces of the light valve, the adsorption tower top branch valve is installed on the adsorption tower top branch pipeline, the seventh interface of the light valve is connected to one end of the product gas main pipe, one end of the regeneration gas inlet main pipe is connected to the product gas main pipe, the other end of the regeneration gas inlet main pipe is respectively connected to one end of the regeneration gas inlet branch pipe, the regeneration gas inlet manual valve, the regeneration gas inlet regulating valve FV1, the online flow meter FIC1, the heater, the regeneration gas online inlet temperature meter TIC1 are installed on the regeneration gas inlet main pipe in sequence, the other end of the regeneration gas inlet branch pipe is respectively connected to the top interface of the six adsorption towers, and the regeneration gas inlet branch pipe manual valve is installed on each regeneration gas inlet branch pipe; The other end of the product gas main is connected to the compressor inlet. An online pressure gauge PI1 at the compressor inlet is installed on the product gas main. On the side close to the compressor, it is connected to the compressor outlet pipeline and the product gas main through a reflux pipeline. A reflux regulating valve is installed on the reflux pipeline. The compressor outlet pipeline is connected to one end of the charging hose through a charging manual valve, and the other end of the charging hose is connected to a long tube truck.

2. The hydrogen purification system with self-repairing function according to claim 1, characterized in that: The online flow meter FIC1, the online regeneration gas inlet temperature meter TIC1 and the online regeneration gas outlet temperature meter TI1 connect signals to the controller KY1 through cables.

3. The hydrogen purification system with self-repairing 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 a self-repairing function according to any one of claims 1 to 3, characterized in that: When the adsorption effect of the adsorbent decreases, which is manifested as a decrease in the recovery rate, an excess of the product hydrogen index, or a decrease in the production load, the self-repair system is started, the light valve and the heavy valve are stopped, the branch valve at the top of the adsorption tower and the branch valve at the bottom of the adsorption tower are closed, the compressor is disabled, the filling car manual valve is opened, and the hydrogen in the long tube car enters the compressor outlet pipeline through the filling car hose. The hydrogen pressure is adjusted to 0.1-0.3MPa through the reflux regulating valve, and the regulated hydrogen enters the product gas main pipe to provide a hydrogen source for adsorbent regeneration. The regeneration gas inlet manual valve, the regeneration gas inlet branch pipe manual valve, the regeneration gas outlet branch valve, and the regeneration gas outlet manual valve are opened, and the regeneration flow and temperature are controlled by the controller KY1 to perform self-repair work.

5. The purification method according to claim 4, characterized in that The self-repair working steps are: S1 adsorbent temperature rise: The hydrogen pressure is monitored by the compressor inlet online pressure gauge PI1 to keep the hydrogen pressure at 0.1-0.3MPa, and the total hydrogen flow rate is controlled at 3000Nm through the controller KY1 3 / h, the heater temperature is controlled by the regeneration gas online inlet temperature table TIC1, and the temperature is increased between 25-30℃ / h according to the heating rate of hydrogen, until the regeneration gas online inlet temperature table TIC1 is heated to 110℃ and then the temperature is maintained until the temperature of the regeneration gas outlet online temperature table TI1 of each adsorption tower is greater than 90℃, the controller KY1 starts timing for 3-5 hours, and after timing for 3-5 hours, it enters the adsorbent cooling step; Cooling of S2 adsorbent: The total hydrogen flow rate is controlled at 4000Nm by controller KY1. 3 / h, the heater temperature is controlled by the regeneration gas online inlet temperature table TIC1, and the temperature is increased between 25-30℃ / h according to the cooling rate of hydrogen, until the regeneration gas online inlet temperature table TIC1 is heated to 30℃ and then the temperature is maintained until the temperature of the regeneration gas outlet online temperature table TI1 of each adsorption tower is less than 35℃, the controller KY1 starts timing for 2-4 hours, and the adsorbent regeneration is completed after timing for 2-4 hours.

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