CN115025598A - Regeneration system and regeneration method for hydrogen adsorbent prepared by electrolyzing water - Google Patents

Abstract

The invention discloses a regeneration system and a regeneration method of an adsorbent for preparing hydrogen by electrolyzing water, wherein the regeneration system comprises a plurality of drying towers and an inert gas inlet; each drying tower is respectively provided with an air inlet pipeline and an air outlet pipeline, the inert gas inlet is communicated with the air inlet pipeline of each drying tower through a first pipeline and a second pipeline, and the air outlet pipeline of each drying tower is communicated with the hydrogen outlet through a third pipeline; the first pipeline is provided with a heater or the inside of each drying tower is provided with a heater, and the second pipeline is provided with a heat exchanger; the inlet and outlet conduits form parallel and/or series paths. The drying system can rapidly realize the regeneration of the adsorbent in the purification drying tower, and save energy consumption to the greatest extent.

Description

Regeneration system and regeneration method for hydrogen adsorbent prepared by electrolyzing water

Technical Field

The invention relates to the technical field of hydrogen production by water electrolysis, in particular to a system for regenerating an adsorbent in the hydrogen production process by water electrolysis. The invention also relates to a method for regenerating an adsorbent.

Background

In the electrolytic hydrogen production process, after the hydrogen obtained by hydrogen production is subjected to deoxidation reaction, the hydrogen needs to be further dehydrated by a purification drying tower so as to ensure that the dew point value of the water content in the hydrogen is below-60 ℃.

The purification drying tower dehydrates hydrogen through an internal adsorbent, and when the adsorbent is adsorbed for a certain time or the adsorbent is newly added into the device, the adsorbent needs to be regenerated, so that the adsorbent can obtain adsorption performance.

For example, when the purification and drying tower is first started up or is restarted after a long time of shutdown, the dew point of hydrogen is very high and is far higher than the dew point temperature of the required product hydrogen. In order to regenerate the adsorbent in the drying tower, the whole hydrogen production system needs to be started, the hydrogen produced by the front-end electrolytic tank is separated and deoxidized, and then the partial hydrogen with water is used for regenerating the adsorbent in each purification and drying tower one by one. Because the whole regeneration time is long, and the regenerated hydrogen is completely discharged before the requirement of the dew point is not met, a large amount of hydrogen is wasted in the process, namely the energy of the whole hydrogen production system is used on the regenerated adsorbent, qualified gas is not produced, and the energy is greatly wasted.

Disclosure of Invention

The invention aims to provide a regeneration system of an adsorbent for preparing hydrogen by electrolyzing water. The drying system can rapidly realize the regeneration of the adsorbent in the purification drying tower, and save energy consumption to the greatest extent.

The invention also aims to provide a regeneration method of the hydrogen adsorbent prepared by electrolyzing water.

In order to achieve the above object, the present invention provides a regeneration system of hydrogen adsorbent by electrolyzing water, comprising a plurality of drying towers and an inert gas inlet; each drying tower is respectively provided with an air inlet pipeline and an air outlet pipeline, the inert gas inlet is communicated with the air inlet pipeline of each drying tower through a first pipeline and a second pipeline, and the air outlet pipeline of each drying tower is communicated with the hydrogen outlet through a third pipeline; the first pipeline is provided with a heater or the inside of each drying tower is provided with a heater, and the second pipeline is provided with a heat exchanger for cooling inert gas; the air inlet pipeline and the air outlet pipeline form a parallel and/or series path; in a regeneration state, the first pipeline is conducted, the heater operates, the second pipeline is closed, the heat exchanger stops operating, and inert gas heated by the heater is introduced into the drying tower in a parallel or serial mode; and in a cooling state, the first pipeline is closed, the heater stops running, the second pipeline is conducted, the heat exchanger runs, and the inert gas cooled by the heat exchanger is introduced into the drying tower in a parallel or serial mode.

Optionally, the air conditioner further comprises a controller, wherein the air inlet pipeline, the air outlet pipeline, the first pipeline and the second pipeline are respectively provided with a valve, and the valves are electrically connected to the controller.

Optionally, the air inlet pipeline of each drying tower is provided with a first branch pipeline, and each first branch pipeline is provided with a valve and communicated with each other; and the gas outlet pipeline of each drying tower is respectively provided with a second branch pipeline, and each second branch pipeline is respectively provided with a valve and communicated with each other.

Optionally, the third pipeline is provided with a waste heat recovery unit.

Optionally, the third line is provided with a pressure gauge and a pressure control valve downstream of the heat recovery unit.

Optionally, the third pipeline is provided with a detection bypass, and the detection bypass is provided with a water content meter.

Optionally, the detection bypass is provided with a bypass control valve and a pressure reducing valve upstream of the water content meter.

Optionally, the inert gas inlet is communicated with the first pipeline and the second pipeline through a gas supply main, and the gas supply main is provided with a flow control valve and a gas flowmeter.

Optionally, the heat exchanger is provided with a coolant line provided with a coolant control valve.

Optionally, the first conduit is provided with a temperature detection unit located downstream of the heater, and/or the third conduit is provided with a temperature detection unit.

In order to achieve another object, the present invention provides a method for regenerating an adsorbent of a drying system for hydrogen production by electrolyzing water, comprising:

introducing inert gas into each drying tower in a parallel or serial mode through a first pipeline, and heating the inert gas by adopting a heater while introducing the inert gas so as to start the regeneration of an adsorbent in the drying tower;

and if the regeneration is finished, introducing the inert gas into each drying tower in a parallel or serial mode through a second pipeline, and cooling the inert gas by adopting a heat exchanger while introducing the inert gas so as to cool and blow the adsorbent regenerated at high temperature.

The regeneration system and the regeneration method of the adsorbent for hydrogen production by electrolyzed water can realize rapid regeneration treatment of the adsorbent in the drying tower in hydrogen production by electrolyzed water, so that the adsorbent can rapidly reach an adsorption state, can realize series regeneration or parallel regeneration, can regenerate the adsorbent in the technical process of double towers, three towers or multiple towers, can randomly switch the regeneration sequence of the drying tower, and is not limited according to the requirements of the technology. In addition, because the adsorbent of the drying tower is regenerated by adopting the inert gas instead of the hydrogen generated by the electrolytic cell, the electrolytic cell equipment at the front section does not need to be started, and the energy consumption for hydrogen production is greatly saved; after the regeneration of the drying tower is completed through the inert gas, the electrolytic cell and the post-treatment purification process can be started, and the purpose of quickly producing qualified hydrogen is achieved.

In a preferable scheme, in the regeneration process, the inert gas output from each drying tower has higher temperature due to being heated, and the waste heat recovery unit is arranged in the third pipeline, so that the heat contained in the inert gas can be effectively recovered and utilized, and the energy consumption of the whole system is further reduced.

Drawings

Fig. 1 is a schematic structural diagram of a regeneration system of an adsorbent for hydrogen production by electrolysis of water according to a first embodiment of the present invention;

fig. 2 is a schematic structural diagram of a regeneration system of an adsorbent for hydrogen production by electrolysis of water according to a second embodiment of the present invention;

fig. 3 is a schematic structural diagram of a regeneration system of an adsorbent for producing hydrogen by electrolyzing water according to a third embodiment of the present invention;

fig. 4 is a flow chart of the regeneration method of the hydrogen production adsorbent by electrolyzing water according to the present invention.

In the figure:

1-inert gas inlet 2-flow control valve 3-gas flowmeter 4-cooling liquid control valve 5-heat exchanger 6, 9-gas inlet control valve 7-heater 8, 25- temperature instrument 10, 11, 12, 13, 14, 15-dryer bottom valve 16-third dryer 17-second dryer 18- first dryer 19, 20, 21, 22, 23, 24-dryer top valve 26-waste heat recovery unit 27-pressure gauge 28-pressure control valve 29-bypass control valve 30-controller 31-pressure reducing valve 32-water content tester 33-gas outlet

Detailed Description

In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

In this document, terms such as "upper, lower, inner, and outer" are established based on positional relationships shown in the drawings, and the corresponding positional relationships may vary depending on the drawings, and therefore, the terms are not to be interpreted as absolute limitations on the scope of protection; moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, and do not necessarily require or imply any actual relationship or order between such elements.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a regeneration system for hydrogen production from electrolyzed water according to a first embodiment of the present invention.

In one embodiment, the regeneration system of the adsorbent for producing hydrogen by electrolyzing water provided by the invention mainly comprises three drying towers,

the three drying towers are respectively a first drying tower 18, a second drying tower 17 and a third drying tower 16, the air inlet end of each drying tower is provided with an air inlet pipeline, the air inlet pipeline of the first drying tower 18 is provided with a valve 15, the air inlet pipeline of the second drying tower 17 is provided with a valve 13, the air inlet pipeline of the third drying tower 16 is provided with a valve 11, the air outlet end of each drying tower is provided with an air outlet pipeline, the air outlet pipeline of the first drying tower 18 is provided with a valve 20, the air outlet pipeline of the second drying tower 17 is provided with a valve 22, the air outlet pipeline of the third drying tower 16 is provided with a valve 24, and the air outlet pipelines of the three drying towers converge in the third pipeline and are communicated with a hydrogen outlet through the third pipeline.

The inert gas inlet 1 is communicated with a first pipeline and a second pipeline through a gas supply main pipe, the gas supply main pipe is provided with a flow control valve 2 and a gas flowmeter 3, the first pipeline is provided with a gas inlet control valve 9, the second pipeline is provided with a gas inlet control valve 6, and the first pipeline and the second pipeline are simultaneously communicated with gas inlet pipelines of three drying towers.

The first pipeline is provided with a heater 7, the second pipeline is provided with a heat exchanger 5 for cooling the inert gas, the heater 7 is connected with the heat exchanger 5 in parallel on a flow path, the heat exchanger 5 is provided with a cooling liquid pipeline, and the cooling liquid pipeline is provided with a cooling liquid control valve 4.

The air inlet pipeline of each drying tower is respectively provided with a first branch pipeline, the first branch pipeline of the first drying tower 18 is provided with a valve 14, the first branch pipeline of the second drying tower 17 is provided with a valve 12, the first branch pipeline of the third drying tower 16 is provided with a valve 10, and the three first branch pipelines are communicated with each other. The outlet pipeline of each drying tower is respectively provided with a second branch pipeline, the second branch pipeline of the first drying tower 18 is provided with a valve 19, the second branch pipeline of the second drying tower 17 is provided with a valve 21, the second branch pipeline of the third drying tower 16 is provided with a valve 23, and the three second branch pipelines are communicated with each other. Therefore, the air inlet pipeline and the air outlet pipeline can communicate the three drying towers in a parallel connection mode and can also communicate the three drying towers in a series connection mode, and switching can be performed between the parallel connection and the series connection according to requirements.

The valves on the air inlet pipeline, the air outlet pipeline, the first pipeline and the second pipeline are electrically connected to the controller 30, when the dryer works, in a regeneration state, the first pipeline is conducted, the heater 7 runs, the second pipeline is closed, the heat exchanger 5 stops running, and the controller 30 controls the valves to introduce the inert gas heated by the heater 7 into the three drying towers in a parallel or serial mode; in a cooling state, the first pipeline is closed, the heater 7 stops operating, the second pipeline is conducted, the heat exchanger 5 operates, and the controller 30 controls the valve to introduce the inert gas cooled by the heat exchanger 5 into the three drying towers in a parallel or serial mode.

The third pipeline is provided with a waste heat recovery unit 26, a pressure gauge 27 and a pressure control valve 28 are arranged at the downstream of the waste heat recovery unit 26, the third pipeline is also provided with a detection bypass, the detection bypass is provided with a bypass control valve 29, a pressure reducing valve 31 and a water content tester 32,

in the regeneration process, the inert gas output from each drying tower has higher temperature due to being heated, and the heat contained in the inert gas can be effectively recovered and utilized by arranging the waste heat recovery unit 26 on the third pipeline, so that the energy consumption of the whole system is further reduced.

In order to monitor the temperature of the inert gas, the first line is provided with a temperature meter 8 downstream of the heater 7, while the third line is provided with a temperature meter 25.

The specific process comprises the following steps:

the process flow can carry out parallel regeneration or series regeneration, when the series regeneration is carried out, for example, the regeneration sequence is drying towers 18, 16 and 17, dry inert gas can be introduced into an inert gas inlet 1, the gas inlet flow of a gas flowmeter 3 is regulated through a flow control valve 2, when the regeneration drying is carried out, a gas inlet control valve 9 is opened, a gas inlet control valve 6 is closed, the gas is heated through a heater 7 to reach the required drying temperature of 100-500 ℃, a valve 15 is opened, valves 11 and 13 are closed, the heated gas enters a first drying tower 18 at the moment to regenerate the adsorbent in the first drying tower 18, a valve 19 at the top of the first drying tower 18 and a valve 23 at the top of a third drying tower 16 are opened, high-temperature gas enters the third drying tower 16 from the top, and the adsorbent in the third drying tower 16 is regenerated at the moment; the valve 10 at the bottom of the third drying tower 16 and the valve 12 at the bottom of the second drying tower 17 are opened, the high-temperature gas is discharged from the third drying tower 16, enters the second drying tower 17 from the bottom for regeneration, then enters the waste heat recovery unit 26 through the valve 22 at the top of the second drying tower 17, the heat of the high-temperature gas at the outlet is recovered, the value of a pressure gauge 27 of the system is controlled through a pressure control valve 28 in the process, the pressure of the gas entering a moisture content measuring instrument 32 is controlled through a bypass control valve 29 and a pressure reducing valve 31, and when the moisture content is basically consistent with the moisture content of the inlet gas, the regeneration is finished.

After the high-temperature regeneration is finished, closing the air inlet control valve 9, opening the air inlet control valve 6, and opening the cooling liquid control valve 4 to introduce cooling liquid into the heat exchanger 5, wherein at the moment, the inert gas is cooled by the heat exchanger 5 and then sequentially passes through the first drying tower 18, the third drying tower 16 and the second drying tower 17 according to the route described above to realize cold blowing of the bed layer after the high-temperature regeneration, and the cold blowing is finished after the numerical value of the temperature instrument 25 is reduced to 0-50 ℃, so that the regeneration process of the whole drying tower is finished. Valves not described in the above process are all in the closed state.

When parallel regeneration is carried out, an air inlet control valve 9 is opened, an air inlet control valve 6 is closed, inert gas enters the drying towers from a heater 7, at the moment, a valve 15 at the bottom of a first drying tower 18, a valve 13 at the bottom of a second drying tower 17 and a valve 11 at the bottom of a third drying tower 16 are all in an opening state, the inert gas simultaneously enters the three drying towers, high-temperature gas passing through a bed layer simultaneously leaves the bed layer to enter a waste heat recovery unit 26 by opening a valve 20 at the top of the first drying tower 18, a valve 22 at the top of the second drying tower 17 and a valve 24 at the top of the third drying tower 16, a pressure gauge 27 in the process is regulated by a pressure control valve 28 and finally leaves from an outlet 33, water content monitoring in the regeneration process is obtained by testing of a water content tester 32, after the high-temperature regeneration is finished, the air inlet control valve 6 and a cooling liquid control valve 4 are opened, the air inlet control valve 9 is closed, and (3) enabling inert gas to pass through the heat exchanger 5, simultaneously carrying out cold blowing treatment on the three drying towers according to the route, finishing cold blowing after the numerical value of the temperature instrument 25 is reduced to 0-50 ℃, and finishing the regeneration process of the bed layer, wherein in the process, the water content of the gas is monitored by opening a bypass control valve 29 and a pressure reducing valve 31, wherein the valves not described are all closed and switched, and the control of the whole process is controlled by a controller 30.

The scheme can be used for series regeneration or parallel regeneration of the adsorption bed layers, the regeneration sequence of each drying tower can be randomly controlled during series regeneration, the regeneration can be realized by mainly controlling the opening and closing of related valves through the controller 30, and the system does not limit the number of the drying towers.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a regeneration system for hydrogen adsorbent prepared by electrolyzing water according to a second embodiment of the present invention.

In this embodiment, on the basis of the first embodiment, the heaters are embedded inside the drying towers, and serial regeneration or parallel regeneration can also be realized.

When three drying towers are serially regenerated, the flow control valve 2, the air inlet control valve 9, the valve 15 are opened, the air inlet control valve 6, the valve 11, the valve 13 and the valve 14 are closed, inert gas enters the first drying tower 18, the internal heater of the first drying tower is opened to realize regeneration, then the valve 19 and the valve 21 are opened, the valve 20 and the valve 22 are closed, high-temperature gas enters the second drying tower 17, the internal heater of the second drying tower can be opened or not according to actual selection, the valve 12 and the valve 10 are opened, the high-temperature gas enters the third drying tower 16 from the second drying tower 17 to be regenerated, the heater of the third drying tower 16 can be opened or not according to actual selection, finally the valve 23 is closed, the valve 24 is opened, the gas leaves the third drying tower 16, the subsequent flow is consistent with the first embodiment, and the control of the whole process is controlled by the controller 30.

The same parts of this embodiment as those of the first system for regenerating a hydrogen adsorbent by electrolyzing water are given the same reference numerals, and the same description is omitted.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a regeneration system of an adsorbent for producing hydrogen by electrolyzing water according to a third embodiment of the present invention.

The embodiment is further simplified on the basis of the first embodiment, only parallel regeneration can be realized, the regeneration process is consistent with the parallel regeneration process of the first embodiment, and the process is simpler.

The specific process is as follows:

the flow control valve 2 and the flow control valve 9 are opened, the gas inlet control valve 6 is closed, and the inert gas enters the drying tower from the heater 7, and the heating power thereof is controlled according to the temperatures of the temperature meter 8 and the temperature meter 25. At the moment, the valve 11, the valve 13 and the valve 15 are all in an open state, gas enters the three drying towers simultaneously, high-temperature gas passing through the bed layer simultaneously leaves the bed layer to enter the waste heat recovery unit 26 by opening the valve 20, the valve 22 and the valve 24, the pressure gauge 27 in the process is adjusted by the pressure control valve 28, so that the adjustment of the regeneration pressure is realized, and the gas finally leaves from the outlet 33. The regenerated gas is introduced into the water content meter 32 through the opening degrees of the bypass control valve 29 and the pressure reducing valve 31, and the high-temperature regeneration is terminated when the water content is close to that of the inert gas. At this time, the air inlet control valve 6 and the cooling liquid control valve 4 are opened, the air inlet control valve 9 is closed, the inert gas passes through the heat exchanger 5, the drying tower is subjected to cold blowing treatment according to the above route, the cold blowing is finished after the numerical value of the temperature instrument 25 is reduced to 0-50 ℃, the regeneration process of the bed layer is completed, and the control of the whole process is controlled by the controller 30.

In the present embodiment, the same parts as those of the first colony image capturing device are given the same reference numerals, and the same description is omitted.

The invention has the following beneficial effects:

(1) when the adsorbent is regenerated, the electrolytic cell does not need to be started, namely, the adsorbent is not regenerated by adopting product gas, but dry inert gases such as nitrogen, carbon dioxide, helium, air and the like are adopted, and the adsorbent is blown and swept on the adsorption bed layer after the gases are heated at high temperature, so that the adsorbent is in a dry state, qualified gas can be quickly generated after the hydrogen production system is started, and the energy consumption of the hydrogen production system is reduced.

(2) By controlling the valve switch, one or more towers can be selected to carry out drying regeneration according to the actual situation of the drying device, for example, for a three-tower process, the drying tower in the adsorption and sub-adsorption states can be subjected to regeneration treatment, because the regeneration drying tower can automatically regenerate in the operation of the hydrogen production device, which is the function of the device, the drying tower in the regeneration state can be free from the regeneration scheme of the invention, and thus, the regeneration energy consumption of one tower can be saved in the scheme of the invention.

(3) In the regeneration process, the inert gas can realize the serial regeneration or the parallel regeneration of the drying towers, when the serial regeneration is used, the heating energy consumption of the inert gas can be saved, and the high-temperature heat from the previous drying tower is fully utilized; when the inert gas is adopted for parallel regeneration, the regeneration effect on the selected drying tower is better, but the consumption of the inert gas is relatively higher, so that the energy consumption is relatively higher.

(4) In order to realize rapid regeneration, the regeneration of any one or more drying towers can be realized by controlling the heating power of the heater or opening and closing the inlet and outlet valves of the drying towers, and the regeneration sequence of each drying tower can also be controlled.

(5) The technical scheme of the invention is independent of the electrolytic bath and the post-treatment process, so that the adsorbent can be independently operated during regeneration treatment, the pretreatment preparation work before formal start of the adsorption device is realized, and the modular operation of drying in the drying tower is realized. After the adsorbent is independently and quickly regenerated in advance, qualified product gas can be quickly produced after the hydrogen production system is started.

(6) After the regeneration of the drying tower is completed, the waste heat of the high-temperature gas at the outlet is recovered, so that the regeneration energy consumption of the device is greatly reduced.

As shown in fig. 4, in addition to the above system for regenerating an adsorbent for hydrogen production from electrolyzed water, the present invention also provides a method for regenerating an adsorbent for hydrogen production from electrolyzed water, comprising the following steps:

s101: introducing inert gas into each drying tower in a parallel or serial mode through a first pipeline, and heating the inert gas by using a heater while introducing the inert gas so as to start the regeneration of the adsorbent in the drying tower;

s103: and if the regeneration is finished, introducing the inert gas into each drying tower in a parallel or serial mode through a second pipeline, and cooling the inert gas by adopting a heat exchanger while introducing the inert gas so as to cool and blow the adsorbent regenerated at high temperature.

Between step S101 and step S103, step S102 may be further included: and detecting the water content of the inert gas output by the drying tower, and judging whether the regeneration is finished according to the water content.

After step S013, step S104 may also be included: and after the temperature of the inert gas output by the drying tower is reduced to 0-50 ℃, ending the cold blowing.

The above details describe the regeneration system and the regeneration method of the hydrogen adsorbent produced by electrolyzing water provided by the present invention. The principles and embodiments of the present invention have been described herein using specific examples, which are presented only to assist in understanding the core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (11)

1. A regeneration system of an adsorbent for preparing hydrogen by electrolyzing water is characterized by comprising a plurality of drying towers and inert gas inlets; each drying tower is respectively provided with an air inlet pipeline and an air outlet pipeline, the inert gas inlet is communicated with the air inlet pipeline of each drying tower through a first pipeline and a second pipeline, and the air outlet pipeline of each drying tower is communicated with the hydrogen outlet through a third pipeline; the first pipeline is provided with a heater or the inside of each drying tower is provided with a heater, and the second pipeline is provided with a heat exchanger for cooling inert gas; the air inlet pipeline and the air outlet pipeline form a parallel and/or series path; in a regeneration state, the first pipeline is conducted, the heater operates, the second pipeline is closed, the heat exchanger stops operating, and inert gas heated by the heater is introduced into the drying tower in a parallel or serial mode; and in a cooling state, the first pipeline is closed, the heater stops running, the second pipeline is conducted, the heat exchanger runs, and the inert gas cooled by the heat exchanger is introduced into the drying tower in a parallel or serial mode.

2. The system of claim 1, further comprising a controller, wherein the air inlet pipeline, the air outlet pipeline, the first pipeline and the second pipeline are respectively provided with a valve, and the valves are electrically connected to the controller.

3. The system as claimed in claim 1, wherein the air inlet pipeline of each drying tower is provided with a first branch pipeline, and each first branch pipeline is provided with a valve and communicated with each other; and the gas outlet pipeline of each drying tower is respectively provided with a second branch pipeline, and each second branch pipeline is respectively provided with a valve and communicated with each other.

4. The electrolyzed water hydrogen production adsorbent regeneration system according to claim 1, wherein the third pipeline is provided with a waste heat recovery unit.

5. The electrolyzed water hydrogen production adsorbent regeneration system according to claim 4, wherein the third pipeline is provided with a pressure gauge and a pressure control valve located downstream of the waste heat recovery unit.

6. The system as claimed in claim 1, wherein the third pipeline is provided with a detection bypass, and the detection bypass is provided with a water content meter.

7. The system of claim 6, wherein the detection bypass is provided with a bypass control valve and a pressure reducing valve upstream of the water content meter.

8. The system of claim 1, wherein the inert gas inlet is in communication with the first and second conduits through a gas supply manifold, the gas supply manifold being provided with a flow control valve and a gas flow meter.

9. The system of claim 2, wherein the heat exchanger is provided with a coolant line, and the coolant line is provided with a coolant control valve.

10. The system of claim 2, wherein the first line is provided with a temperature detection unit located downstream of the heater, and/or the third line is provided with a temperature detection unit.

11. A regeneration method of an adsorbent for preparing hydrogen by electrolyzing water comprises the following steps:

introducing inert gas into each drying tower in a parallel or serial mode through a first pipeline, and heating the inert gas by using a heater while introducing the inert gas so as to start the regeneration of the adsorbent in the drying tower;

and if the regeneration is finished, introducing the inert gas into each drying tower in a parallel or serial mode through a second pipeline, and cooling the inert gas by adopting a heat exchanger while introducing the inert gas so as to cool and blow the adsorbent regenerated at high temperature.

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