Regeneration method for stable temperature rise of pressure swing adsorption device

Abstract

The invention discloses a regeneration method for stable temperature rise of a pressure swing adsorption device, which comprises the following steps: closing an adsorbent regeneration system, and purifying raw material gas to be purified by using a purification system to obtain product gas; when the purity of the product gas cannot meet the requirement, the purification system is closed, and the adsorbent regeneration system is started; nitrogen is uniformly distributed into each pressure swing adsorption tower by adjusting each regeneration inlet valve, and the internal flow and the inlet and outlet pressure difference of each pressure swing adsorption tower are kept consistent by adjusting each regeneration outlet valve; and by adjusting all regeneration inlet valves and regeneration outlet valves, it is ensured that the temperature rise conditions in all the pressure swing adsorption towers are consistent, and the gas is finally discharged into an analysis gas tank. According to the invention, temperature rise and temperature drop are synchronously completed in the regeneration process of the pressure swing adsorption tower, and the regeneration effect is consistent.

Description

Technical Field

[0001] The present invention relates to the technical field of adsorbent purification, and more specifically to a regeneration method for a pressure swing adsorption device with stable temperature rise. Background Art

[0002] The pressure swing adsorption process is based on physical adsorption. The process uses the contact between the solid adsorbent in the adsorbent bed and the inlet gas to selectively adsorb specific components in the mixed gas at a higher pressure, so that the product gas can reduce the adsorbed specific component gas when enriched. This design can achieve selective removal of impurities to meet the requirements of gas quality specifications. The regeneration process does not require heating, the adsorbent will not fail due to hygrothermal effects, and the life of the adsorbent material can be very long.

[0003] Existing pressure swing adsorption devices are prone to impurity penetration or heavy components and polar substances entering the pores of the adsorbent when operating at high loads. They are difficult to remove at normal temperatures, resulting in a decrease in adsorption capacity, a significant decrease in product recovery rate, and an increase in production and operating costs.

[0004] The current regeneration method has defects. It cannot ensure the consistency of the flow rate inside the adsorption tower, and cannot ensure the consistency of the temperature rise rate of each pressure swing adsorption tower. During the regeneration process, the temperature rise rate of some pressure swing adsorption towers is too fast, which will cause problems such as adsorbent agglomeration and damage the adsorbent of some pressure swing adsorption towers. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a regeneration method for a pressure swing adsorption device with stable temperature rise. Through online monitoring and control, the temperature rise and temperature drop are ensured to be completed synchronously during the regeneration process of the pressure swing adsorption tower, thereby ensuring the consistency of the adsorbent regeneration effect.

[0006] The objectives of the present invention are achieved through the following technical solutions.

[0007] The regeneration method of the pressure swing adsorption device for stabilizing the temperature rise of the present invention comprises the following steps:

[0008] (1) Raw gas purification

[0009] Close the nitrogen valve, regeneration gas main valve, all regeneration inlet valves, and all regeneration outlet valves in the regeneration system of the pressure swing adsorption device with stable temperature rise, and blind all the 8-shaped blind plates, and open all the other valves. At this time, the adsorbent regeneration system is closed, the purification system operates normally, and the raw gas to be purified is purified normally to obtain the product gas after purification;

[0010] (2) Adsorbent regeneration

[0011] When the purity of the product gas does not meet the requirements, the purification system is closed and the adsorbent regeneration system is started; the raw gas valve, the main purification valve, all purification inlet valves, and all purification outlet valves are closed, and the nitrogen valve, the main regeneration gas valve, all regeneration inlet valves, and all regeneration outlet valves are opened, and all 8-shaped blind plates are turned on; nitrogen enters the adsorbent regeneration system through the nitrogen pipeline, passes through the flow meter, the electric heater, and the main regeneration gas valve, and adjusts each regeneration inlet valve to evenly distribute it to each pressure swing adsorption tower. By adjusting each regeneration outlet valve, the internal flow and inlet and outlet pressure difference of each pressure swing adsorption tower are kept consistent; by adjusting all regeneration inlet valves and regeneration outlet valves, the temperature rise inside each pressure swing adsorption tower is ensured to be consistent, and finally discharged into the analytical gas tank; if there is a temperature rise difference in a certain pressure swing adsorption tower, the corresponding regeneration inlet valve and regeneration outlet valve are adjusted to increase or decrease the internal flow of the pressure swing adsorption tower, so as to achieve the purpose of synchronous temperature rise or temperature drop of each pressure swing adsorption tower, and ensure that the temperature rise rate of each pressure swing adsorption tower is consistent.

[0012] Further, the specific process of adsorbent regeneration is as follows:

[0013] S1: Pressure swing adsorption tower emptying

[0014] When the purity of the product gas does not meet the requirements, shut down the purification system and start the adsorbent regeneration system; close the raw gas valve, the main purification valve, all purification inlet valves, all purification outlet valves, all 8-shaped blind plates are turned on, open all regeneration outlet valves, and discharge the gas in the absorption tower into the analytical gas tank, and then enter the flare system for combustion until the pressure value of each regeneration outlet reaches 0.01-0.03Mpa;

[0015] S2: Pressure swing adsorption tower pressure regulation at normal temperature

[0016] Open the nitrogen valve, the main regeneration gas valve and all regeneration inlet valves, and control the flow rate in each pressure swing adsorption tower to 400-600Nm by adjusting the regeneration inlet valve and regeneration outlet valve. 3 / h, during the regeneration process, ensure that the pressure gauge of each regeneration inlet is at 0.2-0.3Mpa, and the pressure gauge of each regeneration outlet is at 0.01-0.05Mpa, and ensure that the internal flow and the inlet and outlet pressure difference of each pressure swing adsorption tower are consistent at room temperature;

[0017] S3: Adsorbent temperature rises

[0018] When the electric heater starts to heat up, the nitrogen pressure at the top of the pressure swing adsorption tower rises, the nitrogen pressure at the top is 0.3-0.4MPa, and the pressure at the bottom of the pressure swing adsorption tower is 0.02-0.06MPa. The nitrogen valve is used to control the total flow of nitrogen to be stable; the electric heater heats the nitrogen, and the heating rate of the nitrogen is 20-50℃ / h. The temperature display value of each regeneration outlet thermometer is recorded every 30-60 minutes. The temperature is heated to 100℃ and maintained for 3-5 hours; the impurity content in the nitrogen is sampled and analyzed in the analytical gas tank to ensure that the impurities are purged clean, that is, the impurity content reaches 0;

[0019] S4: Adsorbent cooling

[0020] The total nitrogen flow rate is still kept stable, and the nitrogen cooling rate is controlled not to exceed 20-50℃ / h. The temperature display value of each regeneration outlet thermometer is recorded every 30-60 minutes. Finally, the bottom temperature of each pressure swing adsorption tower is controlled at 20-30℃, and the purge is carried out for at least 1 hour.

[0021] S5: Pressure swing adsorption tower replacement

[0022] Close the nitrogen valve, use qualified product gas to pass into the regeneration gas inlet main pipe, adjust each regeneration inlet valve and each regeneration outlet valve to ensure that each regeneration inlet pressure gauge is 0.2-0.3Mpa, and each regeneration outlet pressure gauge is 0.01-0.05Mpa, close the raw gas valve, wait for each regeneration outlet pressure gauge to drop to 0.01Mpa, open the raw gas valve again, repeat the above operation in step S5, sample and detect impurities in the qualified product gas in the analytical gas tank, and stop replacement when the nitrogen content is less than the set value;

[0023] S6: PSA tower recovery

[0024] Close the nitrogen valve and the main regeneration gas valve, turn all the 8-shaped blind plates inverted, close all the regeneration inlet valves and all the regeneration outlet valves, open the raw gas valve, the purification main valve, all the purification inlet valves, all the purification outlet valves, and purify the raw gas normally;

[0025] Furthermore, the regeneration system for stabilizing the temperature rise of the pressure swing adsorption device comprises N parallel pressure swing adsorption towers, the top gas port of each pressure swing adsorption tower is connected to the product gas pipeline, and the bottom gas port of each pressure swing adsorption tower is connected to the raw gas inlet main pipe through the raw gas branch pipeline, characterized in that each of the product gas pipelines is provided with a purification outlet valve, and each of the raw gas branch pipelines is provided with a purification inlet valve; the raw gas inlet main pipe is provided with a raw gas valve, a flow meter, an electric heater, and a purification main valve in sequence along the gas flow direction, the flow meter inlet is also connected to a nitrogen pipeline, and a nitrogen gas pipeline is provided with a nitrogen gas valve. Gas valve; the top gas inlet of each pressure swing adsorption tower is connected to the outlet end of the regeneration gas inlet main pipe through a regeneration gas inlet branch pipeline, the inlet end of the regeneration gas inlet main pipe is connected to the outlet of the electric heater, each of the regeneration gas inlet branch pipelines is provided with an 8-shaped blind plate, a regeneration inlet valve, and a regeneration inlet pressure gauge in sequence along the gas flow direction, and the regeneration gas inlet main pipe is provided with a regeneration gas main valve; the bottom gas inlet of each pressure swing adsorption tower is connected to the analysis gas tank through a regeneration gas outlet branch pipeline, and each of the regeneration gas outlet branch pipelines is provided with a regeneration outlet thermometer, a regeneration outlet pressure gauge, and a regeneration outlet valve.

[0026] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0027] (1) The present invention retains the purification process of the pressure swing adsorption tower while adding an adsorbent regeneration process, which can realize the online regeneration function of the pressure swing adsorption tower and ensure that the pressure swing adsorption tower can purify the product gas in the forward direction and regenerate the adsorbent in the reverse direction.

[0028] (2) The present invention reads the regeneration inlet pressure gauge and the regeneration outlet pressure gauge at the top and the bottom of each pressure swing adsorption tower, and then adjusts the regeneration inlet valve and the regeneration outlet valve at the top and the bottom of each pressure swing adsorption tower to ensure that the pressure difference in each pressure swing adsorption tower is consistent, thereby ensuring that the flow rate inside each pressure swing adsorption tower is consistent.

[0029] (3) In the present invention, under the action of the electric heater, the regeneration outlet thermometer of each pressure swing adsorption tower is checked, and the regeneration inlet valve and the regeneration outlet valve at the top and the bottom of each pressure swing adsorption tower are adjusted to increase or decrease the internal flow of the pressure swing adsorption tower, so as to achieve the purpose of synchronous temperature rise or temperature drop of each adsorption tower, ensure that the temperature rise rate of each pressure swing adsorption tower is consistent, ensure that the regeneration temperature rise of the system pressure swing adsorption tower is synchronized, and there will be no problems such as overburning of the adsorbent and lack of temperature, avoid damage to the adsorbent in the pressure swing adsorption tower during the regeneration process, and ensure the consistency of the adsorbent regeneration effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1It is a schematic diagram of the principle of the regeneration method for stable temperature rise of the pressure swing adsorption device of the present invention.

[0031] Figure numerals: 1-raw gas valve, 2-nitrogen valve, 3-flow meter, 4-electric heater, 5-regeneration gas main valve, 6-purification main valve, 7-raw gas inlet main pipe, 8-nitrogen pipeline, 9-regeneration gas inlet main pipe, 10 (1) to 10 (N)-purification inlet valve, 11 (1) to 11 (N)-raw gas branch pipeline, 12 (1) to 12 (N)-product gas pipeline, 13 (1) to 13 (N)-purification outlet valve, 14 (1) to 1 4(N)-regeneration gas inlet branch pipeline, 15(1)~15(N)-8-shaped blind plate, 16(1)~16(N)-regeneration inlet valve, 17(1)~17(N)-regeneration inlet pressure gauge, 18(1)~18(N)-regeneration gas outlet branch pipeline, 19(1)~19(N)-regeneration outlet thermometer, 20(1)~20(N)-regeneration outlet pressure gauge, 21(1)~21(N)-regeneration outlet valve, 22-analysis gas tank. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings.

[0033] like Figure 1 As shown, the present invention proposes a regeneration system for a pressure swing adsorption device with stable temperature rise, comprising N pressure swing adsorption towers connected in parallel with each other, and generally N can take a value of 2 to 10.

[0034] The top gas outlet of each pressure swing adsorption tower is connected to a product gas pipeline (i.e., 12(1) to 12(N)), and each product gas pipeline is provided with a purification outlet valve (i.e., 13(1) to 13(N)). The bottom gas outlet of each pressure swing adsorption tower is connected to a raw gas inlet main pipe 7 through a raw gas branch pipeline (i.e., 11(1) to 11(N)); each raw gas branch pipeline is provided with a purification inlet valve (i.e., 10(1) to 10(N)); the raw gas inlet main pipe 7 is provided with a raw gas valve 1, a flow meter 3, an electric heater 4, and a purification main valve 6 in sequence along the gas flow direction, and the inlet of the flow meter 3 is also connected to a nitrogen pipeline 8, and a nitrogen valve 2 is provided on the nitrogen pipeline 8.

[0035] The top gas outlet of each pressure swing adsorption tower is connected to the outlet end of the regeneration gas inlet main pipe 9 through a regeneration gas inlet branch pipeline (i.e., 14 (1) to 14 (N)), and the inlet end of the regeneration gas inlet main pipe 9 is connected to the outlet of the electric heater 4. The regeneration gas inlet main pipe 9 is provided with a regeneration gas main valve 5. Each of the regeneration gas inlet branch pipelines (i.e., 14 (1) to 14 (N)) is provided with an 8-shaped blind plate (i.e., 15 (1) to 15 (N)), a regeneration inlet valve (i.e., 16 (1) to 16 (N)), and a regeneration inlet pressure gauge (i.e., 17 (1) to 17 (N)) in sequence along the gas flow direction. The bottom gas outlet of each pressure swing adsorption tower is connected to the analysis gas tank 22 through a regeneration gas outlet branch pipeline (i.e., 18(1)~18(N)), and each regeneration gas outlet branch pipeline (i.e., 18(1)~18(N)) is provided with a regeneration outlet thermometer (i.e., 19(1)~19(N)), a regeneration outlet pressure gauge (i.e., 20(1)~20(N)), and a regeneration outlet valve (i.e., 21(1)~21(N)).

[0036] In the above system, the raw gas valve 1, the flow meter 3, the raw gas inlet main pipe 7, the electric heater 4, the purification main valve 6, the purification inlet valves 10 (1) to 10 (N), the raw gas branch pipelines 1 (1) to 11 (N), the pressure swing adsorption towers 1 to N, the product gas pipelines 12 (1) to 12 (N), and the purification outlet valves 13 (1) to 13 (N) constitute the purification system of the present invention, the nitrogen valve 2, the nitrogen pipeline 8, the regeneration gas main valve 5, the regeneration gas inlet main pipe 9, the regeneration gas inlet The branch pipeline 14(1)~14(N), the 8-shaped blind plate 15(1)~15(N), the regeneration inlet valve 16(1)~16(N), the regeneration inlet pressure gauge 17(1)~17(N), the regeneration gas outlet branch pipeline 18(1)~18(N), the regeneration outlet thermometer 19(1)~19(N), the regeneration outlet pressure gauge 20(1)~20(N), the regeneration outlet valve 21(1)~21(N), and the analytical gas tank 22 constitute the adsorbent regeneration system in the present invention.

[0037] Based on the above-mentioned regeneration system for stable temperature rise of pressure swing adsorption device, the present invention proposes a regeneration method for stable temperature rise of pressure swing adsorption device, which mainly includes two parts: raw gas purification and adsorbent regeneration. The specific process is as follows:

[0038] (1) Raw gas purification

[0039] The nitrogen valve 2, the main regeneration gas valve 5, all the regeneration inlet valves 16(1) to 16(N), and all the regeneration outlet valves 21(1) to 21(N) in the regeneration system of the above-mentioned pressure swing adsorption device with stable temperature rise are all closed, all the 8-shaped blind plates 15(1) to 15(N) are all inverted, and the remaining valves are all opened. At this time, the adsorbent regeneration system is closed and the purification system operates normally, which can effectively isolate the adsorbent regeneration system and the purification system. The purification system can be used to purify the raw gas to be purified normally, and the product gas can be obtained after purification.

[0040] For example, the raw gas to be purified may be any one of hydrogen, nitrogen, carbon monoxide, helium, etc., and the corresponding product gas may be any one of hydrogen, nitrogen, carbon monoxide, helium, etc. that meets the purity requirements.

[0041] (2) Adsorbent regeneration

[0042] When the purity of the product gas does not meet the requirements, it is necessary to shut down the purification system and start the adsorbent regeneration system. Close the raw gas valve 1, the purification main valve 6, each purification inlet valve 10 (1) ~ 10 (N), each purification outlet valve 13 (1) ~ 13 (N), open the nitrogen valve 2, the regeneration gas main valve 5, each regeneration inlet valve 16 (1) ~ 16 (N), each regeneration outlet valve 21 (1) ~ 21 (N), and all the 8-shaped blind plates 15 (1) ~ 15 (N) are open. The nitrogen enters the adsorbent regeneration system through the nitrogen pipeline, passes through the flow meter 3, the electric heater 4 (for controlling the temperature of the nitrogen), and the regeneration gas main valve 5, and adjusts each regeneration inlet valve 16 (1) to 16 (N) to be evenly distributed to each pressure swing adsorption tower, and reads each regeneration inlet pressure gauge 17 (1) to 17 (N) and each regeneration outlet pressure gauge 20 (1) to 20 (N). By adjusting each regeneration outlet valve 21 (1) to 21 (N), the internal flow and the inlet and outlet pressure difference of each pressure swing adsorption tower are kept consistent; by checking each regeneration outlet thermometer 1 9(1)~19(N), by adjusting the regeneration inlet valve 16(1)~16(N) and the regeneration outlet valve 21(1)~21(N), ensure that the temperature rise inside each pressure swing adsorption tower is consistent, and finally discharge it into the analytical gas tank 22; if there is a temperature rise difference in a certain pressure swing adsorption tower, by adjusting the corresponding regeneration inlet valve 16(1)~16(N) and the regeneration outlet valve 21(1)~21(N), increase or decrease the internal flow of the pressure swing adsorption tower, so as to achieve the purpose of synchronous temperature rise or temperature drop of each pressure swing adsorption tower, and ensure that the temperature rise rate of each pressure swing adsorption tower is consistent. The specific process is as follows:

[0043] S1: Pressure swing adsorption tower emptying

[0044] When the purity of the product gas does not meet the requirements, it is necessary to shut down the purification system and start the adsorbent regeneration system. This system does not require replacement, only the corresponding valves need to be switched on and off. Close the raw gas valve 1, the purification main valve 6, all purification inlet valves 10 (1) to 10 (N), all purification outlet valves 13 (1) to 13 (N), all 8-shaped blind plates 15 (1) to 15 (N) are all open, open all regeneration outlet valves 21 (1) to 21 (N), and discharge the gas in the absorption tower into the analytical gas tank 22, and then enter the flare system for combustion until the pressure value of each regeneration outlet pressure gauge 20 (1) to 20 (N) reaches 0.01-0.03Mpa. At this time, the nitrogen valve 2, the regeneration gas main valve 5, and the regeneration inlet valves 16 (1) to 16 (N) are still in the closed state.

[0045] S2: Pressure swing adsorption tower pressure regulation at normal temperature

[0046] Open nitrogen valve 2, regeneration gas main valve 5 and all regeneration inlet valves 16(1)~16(N), and control the flow rate in each pressure swing adsorption tower to 400-600Nm by adjusting the regeneration inlet valves 16(1)~16(N) and regeneration outlet valves 21(1)~21(N). 3 / h, during the regeneration process, it is necessary to ensure that the regeneration inlet pressure gauges 17 (1) ~ 17 (N) are 0.2-0.3Mpa, and the regeneration outlet pressure gauges 20 (1) ~ 20 (N) are 0.01-0.05Mpa. At room temperature (i.e., the electric heater 4 is not heated), the internal flow rate and the inlet and outlet pressure difference of each pressure swing adsorption tower are consistent. The regeneration process will cause the temperature to rise and the pressure to rise.

[0047] S3: Adsorbent temperature rises

[0048] When the electric heater 4 starts to heat up, the nitrogen pressure at the top of the pressure swing adsorption tower rises, the nitrogen pressure at the top is 0.3-0.4MPa, and the pressure at the bottom of the pressure swing adsorption tower is 0.02-0.06MPa. The nitrogen valve 2 is used to control the total nitrogen flow to be stable (the flow meter 3 displays the value, such as 1000Nm 3 / h); the electric heater 4 heats the nitrogen, the heating rate of the nitrogen is 20-50℃ / h, and the temperature display value of the regeneration outlet thermometer 19(1)~19(N) is recorded every 30-60 minutes, and the temperature is raised to 100℃ and maintained for 3-5 hours. Samples are taken from the analytical gas tank 22 to analyze the impurity content in the nitrogen to ensure that the impurities are purged clean, that is, the impurity content reaches 0.

[0049] S4: Adsorbent cooling

[0050] The total nitrogen flow rate is still kept stable, such as the total nitrogen flow rate is 1000Nm 3 / h, the nitrogen cooling rate is controlled by electric heater 4 to not exceed 20-50℃ / h, the temperature display value of regeneration outlet thermometer 19(1)~19(N) is recorded every 30-60 minutes, and finally the bottom temperature of each pressure swing adsorption tower is controlled by electric heater 4 to be around 20-30℃, and the purge is carried out for at least 1 hour, preferably 2 hours.

[0051] S5: Pressure swing adsorption tower replacement

[0052] Close nitrogen valve 2, and allow qualified product gas to enter the regeneration gas inlet main pipe 9 through raw gas valve 1. By adjusting the regeneration inlet valves 16(1)~16(N) and the regeneration outlet valves 21(1)~21(N), ensure that the regeneration inlet pressure gauges 17(1)~17(N) are all 0.2-0.3Mpa, and the regeneration outlet pressure gauges 20(1)~20(N) are all 0.01-0.05Mpa. Close raw gas valve 1, wait for the regeneration outlet pressure gauges 20(1)~20(N) in the system to automatically drop to 0.01Mpa, then open raw gas valve 1 again, repeat the above operation 6-8 times, take samples from the analytical gas tank 22 to detect impurities in the qualified product gas, and stop replacement when the nitrogen content is less than the set value.

[0053] S6: PSA tower recovery

[0054] Close nitrogen valve 2 and regeneration gas main valve 5, turn over all 8-shaped blind plates 15(1)~15(N), close all regeneration inlet valves 16(1)~16(N) and all regeneration outlet valves 21(1)~21(N), open raw gas valve 1, purification main valve 6, purification inlet valves 10(1)~10(N), purification outlet valves 13(1)~13(N). At this time, the adsorbent regeneration system is closed and the purification system operates normally, and the raw gas can be purified normally.

[0055] Although the functions and working processes of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific functions and working processes, and the above-mentioned specific implementation methods are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which are all within the protection of the present invention.

Claims

1. A regeneration method for a pressure swing adsorption device with stable temperature rise, characterized in that: The process includes: (1) Raw gas purification Close the nitrogen valve, regeneration gas main valve, all regeneration inlet valves, and all regeneration outlet valves in the regeneration system of the pressure swing adsorption device with stable temperature rise, and blind all the 8-shaped blind plates, and open all the other valves. At this time, the adsorbent regeneration system is closed, the purification system operates normally, and the raw gas to be purified is purified normally to obtain the product gas after purification; (2) Adsorbent regeneration When the purity of the product gas does not meet the requirements, shut down the purification system and start the adsorbent regeneration system; close the raw gas valve, the main purification valve, all purification inlet valves, and all purification outlet valves, open the nitrogen valve, the main regeneration gas valve, all regeneration inlet valves, and all regeneration outlet valves, and all 8-shaped blind plates are turned on; nitrogen enters the adsorbent regeneration system through the nitrogen pipeline, passes through the flow meter, the electric heater, and the main regeneration gas valve, adjusts each regeneration inlet valve, and evenly distributes it to each pressure swing adsorption tower. By adjusting each regeneration outlet valve, the internal flow and inlet and outlet pressure difference of each pressure swing adsorption tower are kept consistent; by adjusting all regeneration inlet valves and regeneration outlet valves, ensure that the temperature rise inside each pressure swing adsorption tower is consistent, and finally discharged into the analytical gas tank; If there is a temperature rise difference in a certain pressure swing adsorption tower, the corresponding regeneration inlet valve and regeneration outlet valve are adjusted to increase or decrease the internal flow of the pressure swing adsorption tower, so as to achieve the purpose of synchronous temperature rise or temperature drop of each pressure swing adsorption tower and ensure that the temperature rise rate of each pressure swing adsorption tower is consistent.

2. The regeneration method for stabilizing the temperature rise of a pressure swing adsorption device according to claim 1, characterized in that: The specific process of adsorbent regeneration is as follows: S1: Pressure swing adsorption tower emptying When the purity of the product gas does not meet the requirements, shut down the purification system and start the adsorbent regeneration system; close the raw gas valve, the main purification valve, all purification inlet valves, all purification outlet valves, all 8-shaped blind plates are turned on, open all regeneration outlet valves, and discharge the gas in the absorption tower into the analytical gas tank, and then enter the flare system for combustion until the pressure value of each regeneration outlet reaches 0.01-0.03Mpa; S2: Pressure swing adsorption tower pressure regulation at normal temperature Open the nitrogen valve, the main regeneration gas valve and all regeneration inlet valves, and control the flow rate in each pressure swing adsorption tower to 400-600Nm by adjusting the regeneration inlet valve and regeneration outlet valve. 3 / h, during the regeneration process, ensure that the pressure gauge of each regeneration inlet is 0.2-0.3Mpa, and the pressure gauge of each regeneration outlet is 0.01-0.05Mpa, and ensure that the internal flow and inlet and outlet pressure difference of each pressure swing adsorption tower are consistent at room temperature; S3: Adsorbent temperature rises When the electric heater starts to heat up, the nitrogen pressure at the top of the pressure swing adsorption tower rises, and the pressure range is 0.3-0.4MPa. The pressure at the bottom of the pressure swing adsorption tower is 0.02-0.06MPa. The nitrogen valve is used to control the total flow of nitrogen to be stable. The electric heater heats the nitrogen, and the heating rate of the nitrogen is 20-50℃ / h. The temperature display value of each regeneration outlet thermometer is recorded every 30-60 minutes. The temperature is heated to 100℃ and maintained for 3-5 hours. Samples are taken from the analytical gas tank to analyze the impurity content in the nitrogen to ensure that the impurities are purged clean, that is, the impurity content reaches 0. S4: Adsorbent cooling The total nitrogen flow rate is still kept stable, and the nitrogen cooling rate is controlled not to exceed 20-50℃ / h. The temperature display value of each regeneration outlet thermometer is recorded every 30-60 minutes. Finally, the bottom temperature of each pressure swing adsorption tower is controlled at 20-30℃, and the purge is carried out for at least 1 hour. S5: Pressure swing adsorption tower replacement Close the nitrogen valve, use qualified product gas to pass into the regeneration gas inlet main pipe, adjust each regeneration inlet valve and each regeneration outlet valve to ensure that each regeneration inlet pressure gauge is 0.2-0.3Mpa, and each regeneration outlet pressure gauge is 0.01-0.05Mpa, close the raw gas valve, wait for each regeneration outlet pressure gauge to drop to 0.01Mpa, open the raw gas valve again, repeat the above operation in step S5, sample and detect impurities in the qualified product gas in the analytical gas tank, and stop replacement when the nitrogen content is less than the set value; S6: PSA tower recovery Close the nitrogen valve and the main regeneration gas valve, reverse all 8-shaped blind plates, close all regeneration inlet valves and all regeneration outlet valves, open the raw gas valve, the main purification valve, all purification inlet valves, and all purification outlet valves before purifying the raw gas normally.

3. The regeneration method for stabilizing the temperature rise of a pressure swing adsorption device according to claim 1, characterized in that: The regeneration system for stabilizing the temperature rise of the pressure swing adsorption device comprises N parallel pressure swing adsorption towers, the top gas outlet of each pressure swing adsorption tower is connected to the product gas pipeline, and the bottom gas outlet of each pressure swing adsorption tower is connected to the raw gas inlet main pipe through the raw gas branch pipeline, characterized in that each of the product gas pipelines is provided with a purification outlet valve, and each of the raw gas branch pipelines is provided with a purification inlet valve; the raw gas inlet main pipe is provided with a raw gas valve, a flow meter, an electric heater, and a purification main valve in sequence along the gas flow direction, the flow meter inlet is also connected to a nitrogen pipeline, and a nitrogen valve is provided on the nitrogen pipeline. The top gas inlet of each pressure swing adsorption tower is connected to the outlet end of the regeneration gas inlet main pipe through a regeneration gas inlet branch pipeline, the inlet end of the regeneration gas inlet main pipe is connected to the outlet of the electric heater, and each of the regeneration gas inlet branch pipelines is provided with an 8-shaped blind plate, a regeneration inlet valve, and a regeneration inlet pressure gauge in sequence along the gas flow direction, and the regeneration gas inlet main pipe is provided with a regeneration gas main valve; the bottom gas inlet of each pressure swing adsorption tower is connected to the analysis gas tank through a regeneration gas outlet branch pipeline, and each of the regeneration gas outlet branch pipelines is provided with a regeneration outlet thermometer, a regeneration outlet pressure gauge, and a regeneration outlet valve.

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