CN220467579U

CN220467579U - Hydrogen purification and drying system

Info

Publication number: CN220467579U
Application number: CN202320447216.7U
Authority: CN
Inventors: 姜超; 衣美卿; 唐聪; 王晖; 张慧慧
Original assignee: Wuxi Longji Hydrogen Energy Technology Co ltd
Current assignee: Wuxi Longji Hydrogen Energy Technology Co ltd
Priority date: 2023-03-09
Filing date: 2023-03-09
Publication date: 2024-02-09
Anticipated expiration: 2033-03-09

Abstract

The present disclosure relates to a hydrogen purification and drying system. The system comprises a first drying tower (1), a second drying tower (2), a third drying tower (3) and a fourth drying tower (19); any three of the first drying tower (1), the second drying tower (2), the third drying tower (3) and the fourth drying tower (19) are respectively configured as a working drying tower, a regeneration drying tower and an auxiliary working drying tower, and the rest one drying tower is used as a standby tower, so that when any one of the three drying towers in progress needs to be cut out, the standby tower is cut into use to replace the drying tower needing cutting out. The design of the present disclosure only adds one drying tower, has low investment, can greatly improve the reliability of the system, and ensures the continuous operation of the system.

Description

Hydrogen purification and drying system

Technical Field

The present disclosure relates to the field of crude hydrogen purification, and in particular, to a hydrogen purification and drying system.

Background

Along with the large-scale application of hydrogen energy, monomer equipment is bigger and bigger, and the rear end of the existing water electrolysis hydrogen production separation system is generally matched with a three-tower hydrogen purification and drying process flow. In combination with the large-scale application of hydrogen energy, the prior art generally designs a plurality of hydrogen production separation systems corresponding to an ultra-large purification and drying system, thereby reducing the cost of the whole engineering equipment. However, in this case, once the purification and drying tower is out of operation due to a problem, the whole system will be stopped, and the full utilization of multiple hydrogen production systems is also affected, which may cause a large loss; and the maintenance of the ultra-large equipment is inconvenient, so that the equipment is required to be reasonably and comprehensively overhauled when the equipment is operated to the overhaul period of the whole factory. The existing hydrogen purification and drying process is generally a three-tower drying process, along with the oversized design of single equipment, one purification system can be abutted to a plurality of sets of hydrogen production separation equipment, once a certain drying tower is in a problem, the maintenance of the oversized equipment is inconvenient, the whole purification system cannot normally operate, the continuous production is influenced, and meanwhile, the full utilization of the plurality of sets of hydrogen production systems is also influenced.

In order to improve reliable and continuous operation of the system, a whole set of purification system, namely a plurality of drying towers are usually used in production to improve the reliability of the system and ensure the production continuity, but the solution greatly increases the cost, and when the whole purification system is switched to the standby purification system, the operation of the hydrogen production system or the post-treatment system needs to be stopped and the system needs to be reconnected with the standby system.

In view of this, it is necessary to consider the operational reliability of the purification and drying system, and to ensure full utilization of the entire system with as low investment as possible, satisfying the continuity of production.

Disclosure of Invention

The purpose of the present disclosure is to provide a system for purifying and drying hydrogen, which can ensure full utilization of the whole system and meet the continuity of production under the condition of low investment.

In order to achieve the above object, the present disclosure provides a hydrogen purification and drying system including a first drying tower, a second drying tower, a third drying tower, and a fourth drying tower; any three of the first drying tower, the second drying tower, the third drying tower and the fourth drying tower are respectively configured as a working drying tower, a regeneration drying tower and an auxiliary working drying tower, and the rest one drying tower is used as a standby tower, so that when any one of the three drying towers in progress needs to be cut out, the standby tower is cut into use to replace the drying tower needing to be cut out.

Optionally, the system is configured to have a dry operating condition, a regeneration operating condition, and an auxiliary operating condition that operate in sequence;

the drying conditions are configured to: enabling crude hydrogen prepared by the hydrogen production system to enter a working drying tower for adsorption treatment to obtain purified hydrogen;

the regeneration condition is configured to: dividing purified hydrogen from the working drying column into two parts: leading the first part of purified hydrogen to be taken as product hydrogen to be led out through a first product hydrogen leading-out main line; enabling the second part of purified hydrogen to enter a regeneration drying tower to regenerate the adsorption material of the second part of purified hydrogen to obtain regenerated hydrogen and regenerated adsorption material;

the secondary operating condition is configured to: enabling the regenerated hydrogen to enter an auxiliary working drying tower for carrying out second adsorption treatment to obtain dry regenerated hydrogen; leading the dry regenerated hydrogen out of a main line through a regenerated hydrogen leading-out line;

and the first product hydrogen extraction main line and the regenerated hydrogen extraction main line are combined to form a product hydrogen total extraction main line.

Optionally, the system comprises a work cooling separation unit, a regeneration cooling separation unit and an auxiliary work cooling separation unit; the working cooling separation unit is used for cooling and separating the gas before entering the working drying tower; the regeneration cooling separation unit is used for cooling and separating the regenerated hydrogen obtained by the regeneration drying tower; the auxiliary working cooling and separating unit is used for cooling and separating the gas before entering the auxiliary working drying tower; or alternatively

The system comprises a regeneration cooling separation unit, wherein the regeneration cooling separation unit is used for cooling and separating regenerated hydrogen obtained by a regeneration drying tower.

Optionally, the system comprises a first cooling separation unit, a second cooling separation unit, a third cooling separation unit, and a fourth cooling separation unit; the first cooling separation unit is arranged corresponding to the first drying tower, the second cooling separation unit is arranged corresponding to the second drying tower, the third cooling separation unit is arranged corresponding to the third drying tower, and the fourth cooling separation unit is arranged corresponding to the fourth drying tower; and three cooling separation units in the first cooling separation unit, the second cooling separation unit, the third cooling separation unit and the fourth cooling separation unit are respectively used as a working cooling separation unit, a regeneration cooling separation unit and an auxiliary working cooling separation unit according to the working conditions of the corresponding drying towers, and the rest cooling separation units are used as standby cooling separation units according to the corresponding drying towers.

Optionally, the first cooling separation unit comprises a first cooler and a first gas-water separator, the first cooler comprises a first cooling inlet and a first cooling outlet, the first gas-water separator comprises a first gas-water separation inlet, a first gas-phase outlet and a first liquid-phase outlet, and the first cooling outlet of the first cooler is communicated with the first gas-water separation inlet of the first gas-water separator; the first drying tower comprises a first gas inlet and a first gas outlet; the first gas phase outlet of the first gas-water separator is communicated with the first gas inlet of the first drying tower;

The second cooling separation unit comprises a second cooler and a second gas-water separator, the second cooler comprises a second cooling inlet and a second cooling outlet, the second gas-water separator comprises a second gas-water separation inlet, a second gas-phase outlet and a second liquid-phase outlet, and the second cooling outlet of the second cooler is communicated with the second gas-water separation inlet of the second gas-water separator; the second drying tower comprises a second gas inlet and a second gas outlet; the second gas phase outlet of the second gas-water separator is communicated with the second gas inlet of the second drying tower;

the third cooling separation unit comprises a third cooler and a third gas-water separator, the third cooler comprises a third cooling inlet and a third cooling outlet, the third gas-water separator comprises a third gas-water separation inlet, a third gas-phase outlet and a third liquid-phase outlet, and the third cooling outlet of the third cooler is communicated with the third gas-water separation inlet of the third gas-water separator; the third drying tower comprises a third gas inlet and a third gas outlet; the third gas phase outlet of the third gas-water separator is communicated with the third gas inlet of the third drying tower;

the fourth cooling separation unit comprises a fourth cooler and a fourth gas-water separator, the fourth cooler comprises a fourth cooling inlet and a fourth cooling outlet, the fourth gas-water separator comprises a fourth gas-water separation inlet, a fourth gas-phase outlet and a fourth liquid-phase outlet, and the fourth cooling outlet of the fourth cooler is communicated with the fourth gas-water separation inlet of the fourth gas-water separator; the fourth drying tower comprises a fourth gas inlet and a fourth gas outlet; the fourth gas phase outlet of the fourth gas-water separator is communicated with the fourth gas inlet of the fourth drying tower;

The system also comprises a water collecting device, wherein a sewage inlet of the water collecting device is respectively communicated with a first liquid phase outlet of the first gas-water separator, a second liquid phase outlet of the second gas-water separator, a third liquid phase outlet of the third gas-water separator and a fourth liquid phase outlet of the fourth gas-water separator.

Optionally, the system comprises a fifth cooling separation unit for cooling and separating the regenerated hydrogen obtained from the regeneration drying tower; the fifth cooling separation unit comprises a fifth cooler and a fifth gas-water separator; the fifth cooler comprises a fifth cooling inlet and a fifth cooling outlet, and the fifth gas-water separator comprises a fifth gas-water separation inlet, a fifth gas-phase outlet and a fifth liquid-phase outlet; wherein the fifth cooling outlet of the fifth cooler is in communication with the fifth gas-water separation inlet of the fifth gas-water separator;

a fifth gas phase outlet of the fifth gas-water separator is respectively communicated with a first gas inlet of the first drying tower, a second gas inlet of the second drying tower, a third gas inlet of the third drying tower and a fourth gas inlet of the fourth drying tower;

the system also includes a water collection device having a sewage inlet in communication with the fifth liquid phase outlet of the fifth gas-water separator.

Optionally, the system further comprises an external heating device for heating the regenerated hydrogen before entering the regenerated drying tower;

the external heating device comprises a heating inlet and a heated outlet; the regenerated hydrogen drying bus comprises a heating front-section branch line and a heating rear-section branch line; the inlet end of the heating front section branch line is respectively communicated with a first gas outlet of the first drying tower, a second gas outlet of the second drying tower, a third gas outlet of the third drying tower and a fourth gas outlet of the fourth drying tower, and the outlet end of the heating front section branch line is communicated with a heating inlet of the external heating device and is used for introducing second part of purified hydrogen generated by the first drying tower, the second drying tower, the third drying tower and the fourth drying tower serving as working drying towers into the external heating device for heating; the outlet of the external heating device after heating is communicated with the inlet end of the branch line of the rear heating section, and the outlet end of the branch line of the rear heating section is respectively communicated with the first gas inlet of the first drying tower, the second gas inlet of the second drying tower, the third gas inlet of the third drying tower and the fourth gas inlet of the fourth drying tower, and is used for introducing the regenerated hydrogen after heating from the external heating device into the regenerated drying towers of the first drying tower, the second drying tower, the third drying tower and the fourth drying tower.

Optionally, the external heating device comprises a first heating tower and a second heating tower, and the first heating tower and the second heating tower are used in series or in parallel.

Optionally, the system further comprises a deoxygenation device configured to deoxygenate the crude hydrogen to produce deoxygenated crude hydrogen; the deoxidizing crude hydrogen outlet of the deoxidizing device is respectively communicated with the first gas inlet of the first drying tower, the second gas inlet of the second drying tower, the third gas inlet of the third drying tower and the fourth gas inlet of the fourth drying tower, and is used for introducing deoxidizing crude hydrogen into the working drying tower.

Optionally, the system further comprises a crude hydrogen cooling separation unit; the crude hydrogen cooling separation unit comprises a crude hydrogen cooler and a crude hydrogen-water separator; the crude hydrogen cooler comprises a crude hydrogen cooling inlet and a crude hydrogen cooling outlet, and the crude hydrogen water separator comprises a crude hydrogen separation inlet, a crude hydrogen separation gas phase outlet and a crude hydrogen separation liquid phase outlet; the crude hydrogen cooling outlet of the crude hydrogen cooler is communicated with the crude hydrogen separation inlet of the crude hydrogen water separator, and the crude hydrogen separation gas phase outlet of the crude hydrogen water separator is respectively communicated with the first gas inlet of the first drying tower, the second gas inlet of the second drying tower, the third gas inlet of the third drying tower and the fourth gas inlet of the fourth drying tower;

The crude hydrogen cooling inlet of the crude hydrogen cooler is communicated with the deoxidizing crude hydrogen outlet of the deoxidizing device.

Through above-mentioned technical scheme, this disclosure provides a dry system of hydrogen purification, this system contains four drying towers, has three tower work at purification operation during operation, respectively as work drying tower, regeneration drying tower and auxiliary work drying tower, and the fourth tower is the reserve tower for replace the drying tower that needs to cut out, the design of this disclosure only increases one drying tower, and the input is low, can greatly improve system reliability, guarantees system continuous operation.

Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:

FIG. 1 is an exemplary block diagram of a hydrogen purification drying system provided by the present disclosure;

FIG. 2 is an exemplary block diagram of an external heating device (two heating towers in series) provided by the present disclosure;

FIG. 3a is an exemplary block diagram of an external heating device (two heating towers are in standby) provided by the present disclosure;

FIG. 3b is an exemplary block diagram of an external heating device (two heating towers are in standby) provided by the present disclosure;

FIG. 4 is an exemplary block diagram of a hydrogen purification drying system provided by the present disclosure;

FIG. 5 is an exemplary block diagram of a hydrogen purification drying system provided by the present disclosure;

fig. 6 is an exemplary block diagram of a hydrogen purification drying system provided by the present disclosure.

Reference numerals

1-first drying tower, 2-second drying tower, 3-third drying tower, 4-stop valve, 5-pressure transmitter, 6-ball valve, 7-regeneration flow transmitter, 8-stop valve, 9-filter, 10-crude hydrogen water separator, 11-deoxidation device, 12-crude hydrogen cooling separation unit, 13-first cooling separation unit, 14-second cooling separation unit, 15-third cooling separation unit, 16-water collector, 17-first heating tower, 18-second heating tower, 19-fourth drying tower, 20-fourth cooling separation unit, 21-fifth cooling separation unit, 22-crude hydrogen heating device, 23-ball valve, 24-ball valve, S1-crude hydrogen, S2-first part purified hydrogen product, S3-dry regenerated hydrogen, S4-converged product hydrogen, S5-blowdown, S6-cooling water in, S7-cooling water out.

Detailed Description

The following describes specific embodiments of the present disclosure in detail. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.

In this disclosure, the terms "first, second, third, etc. are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated unless otherwise indicated.

The present disclosure provides a system for hydrogen purification and drying, comprising a first drying tower 1, a second drying tower 2, a third drying tower 3 and a fourth drying tower 19; any three of the first drying tower 1, the second drying tower 2, the third drying tower 3 and the fourth drying tower 19 are configured as a working drying tower, a regeneration drying tower and an auxiliary working drying tower, respectively, and the remaining one drying tower is used as a standby tower, so that when any one of the three drying towers in progress needs to be cut out, the standby tower is cut into use to replace the drying tower which needs to be cut out.

The utility model provides a dry system of hydrogen purification, this system contains four drying towers, has three tower work at purification operation during operation, respectively as work drying tower, regeneration drying tower and auxiliary work drying tower, and the fourth tower is the reserve tower for replace the drying tower that needs to cut out, the design of this disclosure only increases a drying tower, and the input is low, can greatly improve system reliability, guarantees system continuous operation.

In this disclosure, any column failure in the purification system can be replaced with a backup dryer, and the types of failure in the purification system include: (1) When switching the inverted tower, the control valve is problematic, so that a certain tower cannot be used; (2) a certain column molecular sieve desiccant becomes less effective; (3) Problems occur with certain drying tower electric heaters of the internal heating type.

In the present disclosure, the switching of four drying towers, the circulation of materials, and the like are all controlled by a PLC.

In one embodiment, the system is configured to have a dry condition, a regeneration condition, and an auxiliary condition operating in sequence;

In the present disclosure, "sequentially performed drying stage, regeneration stage, and auxiliary operation stage" means that a sequence of sequentially performed drying stage, regeneration stage, and auxiliary operation stage is used as one process flow, and the process flow is repeatedly operated by switching the drying tower to be used as the operation drying tower, regeneration drying tower, and auxiliary operation drying tower, respectively.

In the present disclosure, a first product hydrogen extraction main line is used to extract a first partially purified hydrogen from a working drying tower as product hydrogen; the regenerated hydrogen extraction main line is used for extracting the dried regenerated hydrogen from the auxiliary working drying tower, and the dried regenerated hydrogen can also be used as product hydrogen, so that the first product hydrogen extraction main line and the regenerated hydrogen extraction main line are summarized into the total extraction of the product hydrogen, and the first part of purified hydrogen with qualified quality and the dried regenerated hydrogen with qualified quality are summarized and extracted to be used as the product hydrogen for subsequent processes, such as the introduction into a hydrogen storage tank for storage.

Specifically, as shown in fig. 1, the system is provided with four drying towers (a first drying tower 1, a second drying tower 2, a third drying tower 3, a fourth drying tower 19), any one of which can be set as a spare drying tower for replacing a drying tower having a problem, ensuring the overall operation of the three-tower process. The standby drying tower is replaced for use, the tower-to-tower switching is selected on the system monitoring picture manually, and the logic program of the system controller is automatically completed, so that the system is convenient and labor-saving. For example, the first drying tower 1, the second drying tower 2 and the third drying tower 3 are in use, the fourth drying tower 19 is used as a standby, wherein the switching of the operation drying tower, the regeneration drying tower and the auxiliary operation drying tower is performed among the first drying tower 1, the second drying tower 2 and the third drying tower 3, when any one of the first drying tower 1, the second drying tower 2 and the third drying tower 3 needs to be cut (for example, cutting for maintenance) and when the second drying tower 2 is used as the regeneration drying tower, the standby fourth drying tower 19 is cut in to replace the second drying tower 2 to be used as the regeneration drying tower to maintain stable operation of the system; or the second drying tower 2, the third drying tower 3 and the fourth drying tower 19 are in use, the first drying tower 1 is used as a standby tower, when the third drying tower 3 used for working drying needs to be cut out, the first drying tower 1 is cut into the working drying tower to replace the third drying tower 3 which needs to be cut out so as to maintain the stable operation of the system. The rest of the various cases in which the standby drying tower is cut in place of the drying tower in operation have the same principle and are therefore not described in detail here.

In this disclosure, "crude hydrogen" may be from devices conventional in the art, such as hydrogen produced by a water electrolysis system, crude hydrogen impurities being oxygen, water, trace amounts of nitrogen, and the like.

In the present disclosure, the quality of the final product hydrogen can be tuned by specific process design.

In a specific embodiment, the adsorbent materials employed in the first drying column 1, the second drying column 2, the third drying column 3, and the fourth drying column 19 of the present disclosure are molecular sieves, which may be of the type conventionally selected in the art.

In the present disclosure, the manner of introducing the crude hydrogen, such as the flow rate of introduction, may be adjusted according to the actual process conditions.

In the present disclosure, a corresponding cooling separation unit may be provided for each drying tower according to a use requirement, or only one cooling separation unit may be provided for treating the regenerated hydrogen.

In one embodiment, the system includes a work cooling separation unit, a regenerative cooling separation unit, and an auxiliary work cooling separation unit; the working cooling separation unit is used for cooling and separating the gas before entering the working drying tower; the regeneration cooling separation unit is used for cooling and separating the regenerated hydrogen obtained by the regeneration drying tower; the auxiliary working cooling and separating unit is used for cooling and separating the gas before entering the auxiliary working drying tower; or alternatively

In this disclosure, each "cooling separation unit" includes a cooler and a gas-water separator that are sequentially connected, and in fig. 1 and 4 of this disclosure, the "cooling separation unit" is taken as a whole.

In a first embodiment, as shown in fig. 1, the system includes a first cooling separation unit 13, a second cooling separation unit 14, a third cooling separation unit 15, and a fourth cooling separation unit 20; the first cooling separation unit 13 is arranged corresponding to the first drying tower 1, the second cooling separation unit 14 is arranged corresponding to the second drying tower 2, the third cooling separation unit 15 is arranged corresponding to the third drying tower 3, and the fourth cooling separation unit 20 is arranged corresponding to the fourth drying tower 19; three of the first cooling separation unit 13, the second cooling separation unit 14, the third cooling separation unit 15, and the fourth cooling separation unit 20 are used as a working cooling separation unit, a regeneration cooling separation unit, and an auxiliary working cooling separation unit, respectively, according to the working conditions of the corresponding drying towers, and the remaining one cooling separation unit is used as a backup cooling separation unit according to the corresponding drying towers.

In a more specific embodiment, as shown in fig. 1, the first cooling separation unit 13 includes a first cooler and a first gas-water separator, the first cooler includes a first cooling inlet and a first cooling outlet, the first gas-water separator includes a first gas-water separation inlet, a first gas-phase outlet, and a first liquid-phase outlet, and the first cooling outlet of the first cooler is in communication with the first gas-water separation inlet of the first gas-water separator; the first drying tower 1 comprises a first gas inlet and a first gas outlet; the first gas phase outlet of the first gas-water separator is communicated with the first gas inlet of the first drying tower 1;

the second cooling separation unit 14 includes a second cooler including a second cooling inlet and a second cooling outlet, and a second gas-water separator including a second gas-water separation inlet, a second gas-phase outlet, and a second liquid-phase outlet, the second cooling outlet of the second cooler being in communication with the second gas-water separation inlet of the second gas-water separator; the second drying tower 2 includes a second gas inlet and a second gas outlet; the second gas phase outlet of the second gas-water separator is communicated with the second gas inlet of the second drying tower 2;

the third cooling separation unit 15 includes a third cooler and a third gas-water separator, the third cooler includes a third cooling inlet and a third cooling outlet, the third gas-water separator includes a third gas-water separation inlet, a third gas-phase outlet and a third liquid-phase outlet, the third cooling outlet of the third cooler is communicated with the third gas-water separation inlet of the third gas-water separator; the third drying tower 3 includes a third gas inlet and a third gas outlet; the third gas phase outlet of the third gas-water separator is communicated with the third gas inlet of the third drying tower;

The fourth cooling separation unit 20 includes a fourth cooler and a fourth gas-water separator, the fourth cooler includes a fourth cooling inlet and a fourth cooling outlet, the fourth gas-water separator includes a fourth gas-water separation inlet, a fourth gas-phase outlet, and a fourth liquid-phase outlet, the fourth cooling outlet of the fourth cooler is in communication with the fourth gas-water separation inlet of the fourth gas-water separator; the fourth drying column 19 includes a fourth gas inlet and a fourth gas outlet; the fourth gas phase outlet of the fourth gas-water separator is communicated with the fourth gas inlet of the fourth drying tower 19;

the system further comprises a water collecting device 16, wherein a sewage inlet of the water collecting device 16 is respectively communicated with a first liquid phase outlet of the first gas-water separator, a second liquid phase outlet of the second gas-water separator, a third liquid phase outlet of the third gas-water separator and a fourth liquid phase outlet of the fourth gas-water separator.

In the present disclosure, the opening and closing of valves on the pipelines between different cooling separation units and the drying tower are automatically controlled by the system to realize that the four cooling separation units are respectively used as a working cooling separation unit, a regeneration cooling separation unit, an auxiliary working cooling separation unit and a standby cooling separation unit.

In a second embodiment, as shown in fig. 4 or 6, the system includes a fifth cooling separation unit 21 for cooling and separating the regenerated hydrogen gas obtained from the regeneration drying tower; the fifth cooling separation unit 21 includes a fifth cooler and a fifth gas-water separator; the fifth cooler comprises a fifth cooling inlet and a fifth cooling outlet, and the fifth gas-water separator comprises a fifth gas-water separation inlet, a fifth gas-phase outlet and a fifth liquid-phase outlet; wherein the fifth cooling outlet of the fifth cooler is in communication with the fifth gas-water separation inlet of the fifth gas-water separator;

the fifth gas phase outlet of the fifth gas-water separator is respectively communicated with the first gas inlet of the first drying tower 1, the second gas inlet of the second drying tower 2, the third gas inlet of the third drying tower 3 and the fourth gas inlet of the fourth drying tower 19;

the system further comprises a water collection device 16, wherein the sewage inlet of the water collection device 16 is communicated with the fifth liquid phase outlet of the fifth gas-water separator. The number of the gas coolers and the gas-water separators is further changed, the utilization rate of the gas coolers and the gas-water separators is improved, and the process flow and the pipeline connection are effectively simplified.

In a specific embodiment, as shown in fig. 1, 4 and 5, the coolers in each cooling separation unit are provided with a cooling water inlet and a cooling water outlet.

In the present disclosure, the regeneration treatment is performed in the regeneration drying tower under heating conditions in the regeneration stage; wherein the heating temperature is the temperature required for conventional regeneration in the art.

In the present disclosure, the heating mode in the regeneration stage is selected from the following two modes: the second portion of purified hydrogen is heated either inside the regeneration drying tower or outside the regeneration drying tower.

In a first embodiment, as shown in FIG. 1, the process flow employs in-column heating (no external heating means) of the regenerative drying column. The regeneration drying tower is provided with an inner cylinder and an outer cylinder, an adsorbent is filled between the inner cylinder and the outer cylinder, and a heating element is arranged in the inner cylinder; the second partially purified hydrogen is fed into a regeneration drying tower and heated by a heating element.

In a second embodiment, as shown in FIG. 5, heating the second portion of purified hydrogen outside the regenerative drying tower comprises: heating the second part of purified hydrogen by an external heating device, and then enabling the heated second part of purified hydrogen to enter a regeneration drying tower.

In a preferred embodiment, as shown in FIG. 5, the system further comprises an external heating device for heating the regenerated hydrogen prior to entering the regenerated drying tower;

The external heating device comprises a heating inlet and a heated outlet; the regenerated hydrogen drying bus comprises a heating front-section branch line and a heating rear-section branch line; the inlet end of the branch line of the heating front section is respectively communicated with the first gas outlet of the first drying tower 1, the second gas outlet of the second drying tower 2, the third gas outlet of the third drying tower 3 and the fourth gas outlet of the fourth drying tower 19, and the outlet end of the branch line of the heating front section is communicated with the heating inlet of an external heating device and is used for introducing second part of purified hydrogen generated by the first drying tower 1, the second drying tower 2, the third drying tower 3 and the fourth drying tower 19 serving as working drying towers into the external heating device for heating; the heated outlet of the external heating device is communicated with the inlet end of the branch line of the heated rear section, and the outlet end of the branch line of the heated rear section is respectively communicated with the first gas inlet of the first drying tower 1, the second gas inlet of the second drying tower 2, the third gas inlet of the third drying tower 3 and the fourth gas inlet of the fourth drying tower 19, and is used for introducing the heated regenerated hydrogen from the external heating device into the regenerated drying towers of the first drying tower 1, the second drying tower 2, the third drying tower 3 and the fourth drying tower 19.

In a specific embodiment, the external heating device comprises a first heating tower 17 and a second heating tower 18, and the first heating tower 17 is used in series with the second heating tower 18 (as shown in fig. 2) or in parallel (as shown in fig. 3 a-3 b).

In the present disclosure, for the manner of heating the second part of purified hydrogen in the regeneration drying tower, a plurality of electric heating pipes are provided in each external heating tower, and each single electric heating pipe may be damaged, two external heating towers may be adopted for standby; but also can be used in series. When the hydrogen generating system is used in series, the hydrogen generating system can be suitable for fully heating hydrogen when the hydrogen generating system operates under high power, and can be suitable for heating regenerated hydrogen when the hydrogen generating system operates under low power when the hydrogen generating system operates independently, so that the system heating requirements under different powers are met.

In a more specific embodiment, as shown in fig. 2, two external heating towers (a first heating tower 17 and a second heating tower 18) are connected in series, and regenerated hydrogen from the working drying tower enters a left heating tower (the first heating tower 17) for heating, then enters a right heating tower (and the second heating tower 18) for heating, and flows out and enters the regenerated drying tower.

In another embodiment, as shown in fig. 3 a-3 b, two external heating towers (a first heating tower 17 and a second heating tower 18) are adopted to be connected in parallel, and are mutually standby; for example, in fig. 3a, the first heating tower 17 on the left side works as an external heating tower and the second heating tower 18 on the right side stands by; in fig. 3b, the second heating tower 18 on the right side works as an external heating tower and the first heating tower 17 on the left side heats the tower ready for use. The regenerated hydrogen from the working drying tower flows out after entering the heating tower in working and enters the regeneration drying tower.

In one embodiment, as shown in FIG. 1, the system further comprises a deoxygenation device 11, the deoxygenation device 11 configured to deoxygenate the crude hydrogen to produce deoxygenated crude hydrogen; the deoxidizing crude hydrogen outlet of the deoxidizing device 11 is respectively communicated with the first gas inlet of the first drying tower 1, the second gas inlet of the second drying tower 2, the third gas inlet of the third drying tower 3 and the fourth gas inlet of the fourth drying tower 19 for introducing deoxidizing crude hydrogen into the working drying tower.

In an alternative embodiment, as shown in fig. 1, the system further comprises a crude hydrogen water separator 10, wherein the crude hydrogen water separator 10 comprises a crude hydrogen water separation inlet, a separated gas phase outlet and a separated liquid phase outlet, and the separated gas phase outlet is communicated with the deoxidizing inlet of the deoxidizing device 11 so as to enable the gas phase after the crude hydrogen is subjected to gas-water separation to enter the deoxidizing device 11. In a further embodiment, the system further comprises a crude hydrogen heating means 22, the crude hydrogen heating means 22 comprising a crude hydrogen heating inlet and a crude hydrogen heating outlet, the crude hydrogen heating inlet being in communication with the separated gas phase outlet of the gas-water separator 10, the crude hydrogen heating outlet being in communication with the deoxygenation inlet of the deoxygenation means 11.

In one embodiment, as shown in fig. 1, the system further includes a first connection unit for withdrawing the product hydrogen gas obtained from the drying tower used as the operation drying tower; the first connection unit comprises a first product hydrogen branch line, a second product hydrogen branch line, a third product hydrogen branch line and a fourth product hydrogen branch line; one side opening of the first product hydrogen branch line is communicated with a first gas outlet of the first drying tower 1, one side opening of the second product hydrogen branch line is communicated with a second gas outlet of the second drying tower 2, one side opening of the third product hydrogen branch line is communicated with a third gas outlet of the third drying tower 3, and one side opening of the fourth product hydrogen branch line is communicated with a fourth gas outlet of the fourth drying tower 19; the other side opening of the first product hydrogen branch line, the other side opening of the second product hydrogen branch line, the third product hydrogen branch line and the other side opening of the fourth product hydrogen branch line are respectively communicated with the first product hydrogen leading-out main line;

And the first product hydrogen extraction main line is also provided with an on-line detection device branch line for on-line detection of the extracted product hydrogen so as to realize evacuation of the product hydrogen or introduction of the product hydrogen into the hydrogen storage device according to detection results.

In one embodiment, as shown in fig. 1, the system further includes a second connection unit for leading out the dry regenerated hydrogen obtained from the drying tower used as the auxiliary operation drying tower; the second connection unit comprises a first regenerated hydrogen branch line, a second regenerated hydrogen branch line, a third regenerated hydrogen branch line and a fourth regenerated hydrogen branch line; one side opening of the first regenerated hydrogen branch line is communicated with a first gas outlet of the first drying tower 1, one side opening of the second regenerated hydrogen branch line is communicated with a second gas outlet of the second drying tower 2, one side opening of the third regenerated hydrogen branch line is communicated with a third gas outlet of the third drying tower 3, and one side opening of the fourth regenerated hydrogen branch line is communicated with a fourth gas outlet of the fourth drying tower 19; the other side opening of the first regenerated hydrogen branch line, the other side opening of the second regenerated hydrogen branch line, the other side opening of the third regenerated hydrogen branch line and the other side opening of the fourth regenerated hydrogen branch line are respectively communicated with the regenerated hydrogen leading-out main line;

And the regenerated hydrogen extraction main line is also provided with an on-line detection device branch line for on-line detection of the extracted dry regenerated hydrogen so as to realize emptying of the dry regenerated hydrogen or leading the dry regenerated hydrogen into the hydrogen storage device according to detection results.

In a specific embodiment, as shown in fig. 1, the system further comprises a third connection unit, which is used for separating a second part of regenerated hydrogen from the working drying tower under the drying condition and entering the regeneration drying tower under the regeneration condition; the third connection unit comprises a first regeneration branch line, a second regeneration branch line, a third regeneration branch line, a fourth regeneration branch line and a regenerated hydrogen bus;

one side opening of the first regeneration branch line is communicated with a first gas outlet of the first drying tower 1, one side opening of the second regeneration branch line is communicated with a second gas outlet of the second drying tower 2, one side of the third regeneration branch line is communicated with a third gas outlet of the third drying tower 3, and one side of the fourth regeneration branch line is communicated with a fourth gas outlet of the fourth drying tower 19;

the other side opening of the first regeneration branch line, the other side opening of the second regeneration branch line, the other side opening of the third regeneration branch line and the other side opening of the fourth regeneration branch line are respectively communicated with the regenerated hydrogen bus; and the regenerated hydrogen bus is communicated with the air outlets of the first drying tower 1, the second drying tower 2, the third drying tower 3 and the fourth drying tower 19, so as to realize that the second part of purified hydrogen from the working drying tower is introduced into the regenerated drying tower to carry out reverse purging treatment on the adsorption material.

In the present disclosure, a cooling separation unit is further provided to cool and separate the gas before entering the drying tower to improve the treatment efficiency.

Each of the devices employed in this disclosure are of conventional construction in the art.

In a specific embodiment, as shown in fig. 1, a filter 9, a pressure transmitter 5 and a stop valve 4 are further arranged on the main line of the product hydrogen total outlet in sequence along the flow direction of the materials, and a stop valve 8 is arranged on the main line of the first product hydrogen outlet; the regenerated hydrogen extraction main line comprises two pipelines connected in parallel, a ball valve 24 is arranged on a first parallel pipeline, and a ball valve 23, a regenerated flow transmitter 7 and a ball valve 6 are arranged on a second parallel pipeline for controlling the flow of the regenerated hydrogen.

Example 1

As shown in fig. 1, the present embodiment provides a system for purifying and drying hydrogen (four drying towers + heating in the tower + cooling separation units are provided for each drying tower). When the regeneration tower regenerates, the mode of heating regenerated hydrogen in the tower is adopted, namely the drying tower is of an inner and outer cylinder structure, and the inner cylinder is provided with an electric heating rod; the drying agent is a drying agent such as a molecular sieve, and the drying agent is arranged between the inner cylinder and the outer cylinder.

The system comprises a first drying tower 1, a second drying tower 2, a third drying tower 3 and a fourth drying tower 19; any three of the first drying tower 1, the second drying tower 2, the third drying tower 3 and the fourth drying tower 19 are respectively configured as a working drying tower, a regeneration drying tower and an auxiliary working drying tower, and the rest one drying tower is used as a standby tower, so that when any one of the three drying towers in progress needs to be cut out, the standby tower is cut into use to replace the drying tower needing to be cut out;

The system (each drying tower is connected with a corresponding set of gas cooler and gas-water separator) comprises a first cooling separation unit 13, a second cooling separation unit 14, a third cooling separation unit 15 and a fourth cooling separation unit 20; the first cooling separation unit 13 is arranged corresponding to the first drying tower 1, the second cooling separation unit 14 is arranged corresponding to the second drying tower 2, the third cooling separation unit 15 is arranged corresponding to the third drying tower 3, and the fourth cooling separation unit 20 is arranged corresponding to the fourth drying tower 19; the first cooling separation unit 13 includes a first cooler including a first cooling inlet and a first cooling outlet, and a first gas-water separator including a first gas-water separation inlet, a first gas-phase outlet, and a first liquid-phase outlet, the first cooling outlet of the first cooler being in communication with the first gas-water separation inlet of the first gas-water separator; the first drying tower 1 comprises a first gas inlet and a first gas outlet; the first gas phase outlet of the first gas-water separator is communicated with the first gas inlet of the first drying tower 1;

the system also comprises a water collecting device 16, wherein a sewage inlet of the water collecting device 16 is respectively communicated with a first liquid phase outlet of the first gas-water separator, a second liquid phase outlet of the second gas-water separator, a third liquid phase outlet of the third gas-water separator and a fourth liquid phase outlet of the fourth gas-water separator;

The system further comprises a deoxygenation device 11, the deoxygenation device 11 being configured to deoxygenate the crude hydrogen to obtain deoxygenated crude hydrogen; the deoxidizing crude hydrogen outlet of the deoxidizing device 11 is respectively communicated with the first gas inlet of the first drying tower 1, the second gas inlet of the second drying tower 2, the third gas inlet of the third drying tower 3 and the fourth gas inlet of the fourth drying tower 19 for introducing deoxidizing crude hydrogen into the working drying tower;

the system further includes a crude hydrogen cooling separation unit 12; the crude hydrogen cooling separation unit 12 includes a crude hydrogen cooler and a crude hydrogen water separator; the crude hydrogen cooler comprises a crude hydrogen cooling inlet and a crude hydrogen cooling outlet, and the crude hydrogen water separator comprises a crude hydrogen separation inlet, a crude hydrogen separation gas phase outlet and a crude hydrogen separation liquid phase outlet; the crude hydrogen cooling outlet of the crude hydrogen cooler is communicated with a crude hydrogen separation inlet of a crude hydrogen water separator, and a crude hydrogen separation gas phase outlet of the crude hydrogen water separator is respectively communicated with a first gas inlet of a first drying tower 1, a second gas inlet of a second drying tower 2, a third gas inlet of a third drying tower 3 and a fourth gas inlet of a fourth drying tower 19;

the crude hydrogen cooling inlet of the crude hydrogen cooler is communicated with a deoxidizing crude hydrogen outlet of the deoxidizing device 11;

The system further comprises a crude hydrogen water separator 10, wherein the crude hydrogen water separator 10 comprises a crude hydrogen water separation inlet, a separation gas phase outlet and a separation liquid phase outlet, and the separation gas phase outlet is communicated with the deoxidizing inlet of the deoxidizing device 11 so as to enable the gas phase after the crude hydrogen is subjected to gas-water separation to enter the deoxidizing device 11. In a further embodiment, the system further comprises a crude hydrogen heating device 22, the crude hydrogen heating device 22 comprising a crude hydrogen heating inlet and a crude hydrogen heating outlet, the crude hydrogen heating inlet being in communication with the separated gas phase outlet of the gas-water separator 10, the crude hydrogen heating outlet being in communication with the deoxygenation inlet of the deoxygenation device 11;

a filter 9, a pressure transmitter 5 and a stop valve 4 are also sequentially arranged on the main lead-out line of the product hydrogen in the flow direction of the material, and a stop valve 8 is arranged on the main lead-out line of the first product hydrogen; the regenerated hydrogen extraction main line comprises two pipelines connected in parallel, a ball valve 24 is arranged on a first parallel pipeline, and a ball valve 23, a regenerated flow transmitter 7 and a ball valve 6 are arranged on a second parallel pipeline for controlling the flow of the regenerated hydrogen.

The process flow for purifying hydrogen by adopting the system comprises the following steps:

(1) Assuming that the initial stage is a working stage of the first dryer 1, the second drying tower 2 is a regeneration stage, and the third drying tower 3 is an auxiliary working drying stage (the switching interval time can be determined by the number of molecular sieves in the drying tower);

The crude hydrogen working path enters the crude hydrogen water separator 10 from an inlet, primarily separates water in the crude hydrogen, deoxidizes the water through a deoxidizing tower (deoxidizing device 11), passes through the crude hydrogen cooling and separating unit 12 (sequentially passes through the crude hydrogen cooler and the crude hydrogen water separator from left to right), and is cooled and dehydrated by the first cooling and separating unit 13 (sequentially passes through the first gas water separator and the first gas cooler), is discharged through the water absorption (working state) of the first drying tower 1, removes carried dust and the like through a filter, enters a storage tank after micro-oxygen and dew point detection in the online chromatograph are qualified, and is discharged after the micro-oxygen and dew point detection is disqualified. The flow of the regenerated hydrogen is controlled by the opening of a stop valve on a main product hydrogen output pipeline and the opening of a ball valve on a regenerated gas output pipeline (the hydrogen flow is 10-20% during normal load operation), the separated hydrogen (second part of purified hydrogen) enters a second drying tower 2, moisture adsorbed on the last circle of the second drying tower 2 is blown to enable the second drying tower 2 to be regenerated, then the part of regenerated waste hydrogen passes through a second cooling and separating unit 14 (sequentially passes through a second gas cooler and a second gas-water separator), and after cooling and dewatering by a third cooling and separating unit 15 (sequentially passes through a third gas-water separator and a third gas cooler), the waste hydrogen enters a third drying tower 3 to be dehumidified to form high-purity product hydrogen, and finally passes through a regenerated gas output pipeline and enters a storage tank after being checked to be qualified.

(2) The second drying tower 2 in the next stage is a working stage, the third drying tower 3 is a regeneration stage, and the first drying tower 1 is an auxiliary working stage (the switching interval time can be determined by the number of molecular sieves in the drying tower);

the crude hydrogen working path enters the crude hydrogen water separator 10 from an inlet, primarily separates water in the crude hydrogen, deoxidizes the water through a deoxidizing tower (deoxidizing device 11), passes through the crude hydrogen cooling and separating unit 12 (sequentially passes through the crude hydrogen gas cooler and the crude hydrogen water separator from left to right), and cools and removes water through the second cooling and separating unit 14 (sequentially passes through the second gas water separator and the second gas cooler), is discharged through the water absorption (working state) of the second drying tower 2, removes carried dust and the like through a filter, enters a storage tank after micro-oxygen and dew point detection in the online chromatograph are qualified, and is discharged after the micro-oxygen and dew point detection is disqualified. The flow of the regenerated hydrogen is controlled by the opening of a stop valve on a main product hydrogen output pipeline and the opening of a ball valve on a regenerated gas output pipeline (the hydrogen flow is 10-20% during normal load operation), the shunted hydrogen enters the third drying tower 3, the moisture adsorbed by the third drying tower 3 in the previous week is blown to enable the third drying tower 3 to regenerate, then the regenerated waste hydrogen passes through a third cooling separation unit 15 (sequentially passes through a third gas cooler and a fourth gas-water separator), and after cooling and dewatering by a first cooling separation unit 13 (sequentially passes through the first gas-water separator and the first gas cooler), the waste hydrogen enters the first drying tower 1 to be dehumidified to form high-purity product hydrogen, and finally passes through a regenerated gas output pipeline and enters a storage tank after being inspected to be qualified.

(3): the third drying tower 3 in the next stage is a working stage, the first drying tower 1 is a regeneration stage, and the second drying tower 2 is an auxiliary working stage (the switching interval time can be determined by the number of molecular sieves in the drying tower);

the crude hydrogen working path enters the crude hydrogen water separator 10 from an inlet, primarily separates water in the crude hydrogen, deoxidizes the water through a deoxidizing tower (deoxidizing device 11), passes through the crude hydrogen cooling and separating unit 12 (sequentially passes through the crude hydrogen cooler and the crude hydrogen water separator from left to right), and is discharged after cooling and dewatering of a third gas water separator and a third gas cooler (third cooling and separating unit 15), and is absorbed by water (working state) through the third drying tower 3, dust and the like carried by the water are removed through a filter, and enters a storage tank after micro-oxygen and dew point detection in the online chromatograph are qualified, and is discharged after the micro-oxygen and dew point detection is disqualified. The flow of the regenerated hydrogen is controlled by the opening of a stop valve on a main product hydrogen output pipeline and the opening of a ball valve on a regenerated gas output pipeline (the hydrogen flow is 10-20% during normal load operation), the shunted hydrogen enters the first drying tower 1, the moisture adsorbed on the last week of the first drying tower 1 is blown to regenerate the first drying tower 1, then the regenerated waste hydrogen passes through a first gas cooler and a first gas-water separator (a first cooling separation unit 13), and after cooling and dewatering of a second gas-water separator and a second gas cooler (a second cooling separation unit 14), the waste hydrogen enters the second drying tower 2 to be dehumidified to form high-purity product hydrogen, and finally passes through the regenerated gas output pipeline and enters a storage tank after being inspected to be qualified.

(4) If the third drying tower 3 for auxiliary operation drying fails in the stage 1, the third drying tower 3 is replaced by a spare fourth drying tower 19 for operation, specifically:

the crude hydrogen working path enters the crude hydrogen-water separator 10 from an inlet, primarily separates water in the crude hydrogen, deoxidizes the water by a deoxidizing tower (deoxidizing device 11), passes through the crude hydrogen cooling and separating unit 12 (sequentially passes through the crude hydrogen cooler and the crude hydrogen-water separator from left to right), and is discharged after cooling and dewatering of the first gas-water separator and the first gas cooler (first cooling and separating unit 13) through the first drying tower 1, removes carried dust and the like through a filter, enters a storage tank after micro-oxygen and dew point detection in the online chromatograph are qualified, and is discharged after disqualification. The flow of the regenerated hydrogen is controlled by the opening of a stop valve on a main product hydrogen output pipeline and the opening of a ball valve on a regenerated gas output pipeline (the hydrogen flow is 10-20% during normal load operation), the shunted hydrogen enters the second drying tower 2, the moisture adsorbed by the last circle of the second drying tower 2 is blown to regenerate the second drying tower 2, then the regenerated waste hydrogen passes through a second gas cooler and a second gas-water separator (a second cooling separation unit 14), and after cooling and dewatering of a fourth gas-water separator and a fourth gas cooler (a fourth cooling separation unit 20), the waste hydrogen enters the fourth drying tower 19 to be dehumidified to form high-purity product hydrogen, and finally passes through a regenerated gas output pipeline and enters a storage tank after being checked to be qualified.

Example 2

As shown in fig. 4, the present embodiment provides a system for purification and drying of hydrogen (four drying towers + heating in the tower + only crude hydrogen cooling separation unit and fifth cooling separation unit).

The device provided in this embodiment is different from that in embodiment 1 in that: only the crude hydrogen cooling separation unit 12 and the fifth cooling separation unit 21 are provided.

The process flow for hydrogen purification using the above system includes (as an example, stage 1):

assuming that the initial stage is a working stage of the first dryer 1, the second drying tower 2 is a regeneration stage, and the third drying tower 3 is an auxiliary working drying stage (the switching interval time can be determined by the number of molecular sieves in the drying tower);

the crude hydrogen working path enters the crude hydrogen water separator 10 from an inlet, primarily separates water in the crude hydrogen, deoxidizes the water through a deoxidizing tower (deoxidizing device 11), passes through the crude hydrogen cooling and separating unit 12 (sequentially passes through the crude hydrogen cooler and the crude hydrogen water separator from left to right), and is cooled and dehydrated by the first cooling and separating unit 13 (sequentially passes through the first gas water separator and the first gas cooler), is discharged through the water absorption (working state) of the first drying tower 1, removes carried dust and the like through a filter, enters a storage tank after micro-oxygen and dew point detection in the online chromatograph are qualified, and is discharged after the micro-oxygen and dew point detection is disqualified. The qualified product hydrogen is subjected to flow control of regenerated hydrogen (the hydrogen flow is 10-20% in normal load operation) by a stop valve on a main product hydrogen output pipeline and the opening of a ball valve on a regenerated gas output pipeline, the separated hydrogen (second part of purified hydrogen) enters a second drying tower 2, moisture adsorbed on the last week of the second drying tower 2 is blown to enable the second drying tower 2 to be regenerated, then the part of regenerated waste hydrogen enters a third drying tower 3 to be dehumidified after being subjected to cooling and dewatering by a fifth cooling and separating unit 21 (sequentially passing through a fifth gas cooler and a fifth gas-water separator), and finally passes through a regenerated gas output pipeline and enters a storage tank after being checked to be qualified.

If the third drying tower 3 fails, the regenerated waste hydrogen flowing out from the second drying tower 2 is cooled and dehydrated by the fifth cooling and separating unit 21 (sequentially passing through the fifth gas cooler and the fifth gas-water separator), then enters the fourth drying tower 4 to be dehumidified, high-purity product hydrogen is formed, and finally enters the storage tank after passing through the regenerated gas output pipeline and passing through the inspection.

Example 3

As shown in fig. 5, the present embodiment provides a system for purification and drying of hydrogen gas (four drying towers + heating outside the tower + cooling separation unit is provided for each drying tower).

The present embodiment differs from embodiment 1 in that it includes: external heating devices (a first heating tower 17 and a second heating tower 18 which are used in parallel) are added; and a crude hydrogen heating device 22 is provided between the crude hydrogen water separator 10 and the deoxidizing device 11.

the crude hydrogen working path enters the crude hydrogen water separator 10 from an inlet, primarily separates water in the crude hydrogen, is heated by the crude hydrogen heating device 22, deoxidizes by the deoxidizing tower (deoxidizing device 11), passes through the crude hydrogen cooling and separating unit 12 (sequentially passes through the crude hydrogen gas cooler and the crude hydrogen water separator from left to right), and the first cooling and separating unit 13 (sequentially passes through the first gas water separator and the first gas cooler) for cooling and dewatering, is discharged through the water absorption (working state) of the first drying tower 1, removes carried dust and the like through a filter, enters the storage tank after micro-oxygen and dew point detection in the online chromatograph are qualified, and is discharged after the micro-oxygen and dew point detection are unqualified. The qualified product hydrogen is heated to about 250 ℃ by a drying tower external heater (a first heating tower 17 or a second heating tower 18) through a product hydrogen output main pipeline and the opening of a ball valve on a regenerated gas output pipeline, the flow of the regenerated hydrogen is controlled by the opening of the stop valve on the product hydrogen output main pipeline and the opening of the ball valve on the regenerated gas output pipeline (the hydrogen flow is 10-20 percent in normal load operation), the separated hydrogen enters the second drying tower 2, the moisture adsorbed by the second drying tower 2 in the last period is blown to regenerate the second drying tower 2, and then the part of regenerated waste hydrogen enters a storage tank after passing through a second gas cooler, a second gas-water separator (a second cooling separation unit 14), a third gas-water separator and a third gas cooler (a third cooling separation unit 15) for cooling and dehydrating, so as to form high-purity product hydrogen, and finally enters the storage tank after passing through a regenerated gas output pipeline and passing through inspection.

The steps are reciprocally circulated, and the circulation mode is the same as the internal heating.

If the third drying tower 3 fails, the regenerated waste hydrogen flowing out from the second drying tower 2 passes through the second gas cooler, the second gas-water separator (the second cooling and separating unit 14) and the fourth gas cooler (the fourth cooling and separating unit 20) to be cooled and dehydrated, enters the fourth drying tower 19 to be dehumidified, forms high-purity product hydrogen, and finally passes through a regenerated gas output pipeline and enters a storage tank after being checked to be qualified.

Example 4

As shown in fig. 6, the present embodiment provides a system for purification and drying of hydrogen (four drying towers + heating outside the tower + only crude hydrogen cooling separation unit and fifth cooling separation unit).

The present embodiment differs from embodiment 3 in that it includes: only the crude hydrogen cooling separation unit 12 and the fifth cooling separation unit 21 are provided.

In the present embodiment, the first drying tower 1, the second drying tower 2, the third drying tower 3, and the fourth drying tower 19 are in communication with the fifth cooling separation unit 21. The specific process principle thereof is the same as that of the fifth cooling separation unit 21 in embodiment 2.

The preferred embodiments of the present disclosure have been described in detail above, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.

In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations are not described further in this disclosure in order to avoid unnecessary repetition.

Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.

Claims

1. A system for purification and drying of hydrogen, characterized in that the system comprises a first drying tower (1), a second drying tower (2), a third drying tower (3) and a fourth drying tower (19); any three towers of the first drying tower (1), the second drying tower (2), the third drying tower (3) and the fourth drying tower (19) are respectively configured as a working drying tower, a regeneration drying tower and an auxiliary working drying tower, and the rest one drying tower is used as a standby tower, so that when any one of the three drying towers in progress needs to be cut out, the standby tower is cut into use to replace the drying tower needing to be cut out; the system comprises a working cooling separation unit, a regeneration cooling separation unit and an auxiliary working cooling separation unit; the working cooling separation unit is used for cooling and separating the gas before entering the working drying tower; the regeneration cooling separation unit is used for cooling and separating the regenerated hydrogen obtained by the regeneration drying tower; the auxiliary working cooling and separating unit is used for cooling and separating the gas before entering the auxiliary working drying tower; or alternatively

The system comprises a regeneration cooling separation unit, a regeneration cooling separation unit and a regeneration drying unit, wherein the regeneration cooling separation unit is used for cooling and separating regenerated hydrogen obtained by a regeneration drying tower;

the auxiliary working drying tower is used for carrying out adsorption treatment on the regenerated hydrogen.

2. The system according to claim 1, characterized in that the system comprises a first cooling separation unit (13), a second cooling separation unit (14), a third cooling separation unit (15) and a fourth cooling separation unit (20); the first cooling separation unit (13) is arranged corresponding to the first drying tower (1), the second cooling separation unit (14) is arranged corresponding to the second drying tower (2), the third cooling separation unit (15) is arranged corresponding to the third drying tower (3), and the fourth cooling separation unit (20) is arranged corresponding to the fourth drying tower (19); three cooling separation units of the first cooling separation unit (13), the second cooling separation unit (14), the third cooling separation unit (15) and the fourth cooling separation unit (20) are respectively used as a working cooling separation unit, a regeneration cooling separation unit and an auxiliary working cooling separation unit according to the working conditions of the corresponding drying towers, and the rest cooling separation unit is used as a standby cooling separation unit according to the corresponding drying towers.

3. The system according to claim 2, wherein the first cooling separation unit (13) comprises a first cooler and a first gas-water separator, the first cooler comprising a first cooling inlet and a first cooling outlet, the first gas-water separator comprising a first gas-water separation inlet, a first gas-phase outlet and a first liquid-phase outlet, the first cooling outlet of the first cooler being in communication with the first gas-water separation inlet of the first gas-water separator; the first drying tower (1) comprises a first gas inlet and a first gas outlet; the first gas phase outlet of the first gas-water separator is communicated with the first gas inlet of the first drying tower (1);

the second cooling separation unit (14) comprises a second cooler and a second gas-water separator, the second cooler comprises a second cooling inlet and a second cooling outlet, the second gas-water separator comprises a second gas-water separation inlet, a second gas-phase outlet and a second liquid-phase outlet, and the second cooling outlet of the second cooler is communicated with the second gas-water separation inlet of the second gas-water separator; the second drying tower (2) comprises a second gas inlet and a second gas outlet; the second gas phase outlet of the second gas-water separator is communicated with the second gas inlet of the second drying tower (2);

The third cooling separation unit (15) comprises a third cooler and a third gas-water separator, the third cooler comprises a third cooling inlet and a third cooling outlet, the third gas-water separator comprises a third gas-water separation inlet, a third gas-phase outlet and a third liquid-phase outlet, and the third cooling outlet of the third cooler is communicated with the third gas-water separation inlet of the third gas-water separator; the third drying tower (3) comprises a third gas inlet and a third gas outlet; the third gas phase outlet of the third gas-water separator is communicated with the third gas inlet of the third drying tower;

the fourth cooling separation unit (20) comprises a fourth cooler and a fourth gas-water separator, the fourth cooler comprises a fourth cooling inlet and a fourth cooling outlet, the fourth gas-water separator comprises a fourth gas-water separation inlet, a fourth gas-phase outlet and a fourth liquid-phase outlet, and the fourth cooling outlet of the fourth cooler is communicated with the fourth gas-water separation inlet of the fourth gas-water separator; the fourth drying tower (19) comprises a fourth gas inlet and a fourth gas outlet; a fourth gas phase outlet of the fourth gas-water separator is communicated with a fourth gas inlet of a fourth drying tower (19);

the system further comprises a water collecting device (16), wherein a sewage inlet of the water collecting device (16) is respectively communicated with a first liquid phase outlet of the first gas-water separator, a second liquid phase outlet of the second gas-water separator, a third liquid phase outlet of the third gas-water separator and a fourth liquid phase outlet of the fourth gas-water separator.

4. The system according to claim 1, characterized in that the system comprises a fifth cooling separation unit (21) for cooling separation of the regenerated hydrogen obtained from the regeneration drying tower; the fifth cooling separation unit (21) comprises a fifth cooler and a fifth gas-water separator; the fifth cooler comprises a fifth cooling inlet and a fifth cooling outlet, and the fifth gas-water separator comprises a fifth gas-water separation inlet, a fifth gas-phase outlet and a fifth liquid-phase outlet; wherein the fifth cooling outlet of the fifth cooler is in communication with the fifth gas-water separation inlet of the fifth gas-water separator;

the fifth gas phase outlet of the fifth gas-water separator is respectively communicated with the first gas inlet of the first drying tower (1), the second gas inlet of the second drying tower (2), the third gas inlet of the third drying tower (3) and the fourth gas inlet of the fourth drying tower (19);

the system further comprises a water collection device (16), wherein a sewage inlet of the water collection device (16) is communicated with a fifth liquid phase outlet of the fifth gas-water separator.

5. The system of claim 1, further comprising an external heating device for heating the regenerated hydrogen prior to entering the regeneration drying tower;

The external heating device comprises a heating inlet and a heated outlet; the regenerated hydrogen drying bus comprises a heating front-section branch line and a heating rear-section branch line; the inlet end of the heating front branch line is respectively communicated with a first gas outlet of the first drying tower (1), a second gas outlet of the second drying tower (2), a third gas outlet of the third drying tower (3) and a fourth gas outlet of the fourth drying tower (19), and the outlet end of the heating front branch line is communicated with a heating inlet of the external heating device and is used for introducing second part of purified hydrogen generated by the first drying tower (1), the second drying tower (2), the third drying tower (3) and the fourth drying tower (19) serving as working drying towers into the external heating device for heating; the outlet after heating of the external heating device is communicated with the inlet end of the branch line of the heating rear section, the outlet end of the branch line of the heating rear section is respectively communicated with the first gas inlet of the first drying tower (1), the second gas inlet of the second drying tower (2), the third gas inlet of the third drying tower (3) and the fourth gas inlet of the fourth drying tower (19), and the outlet end of the branch line of the heating rear section is used for introducing the regenerated hydrogen after heating from the external heating device into the regenerated drying towers of the first drying tower (1), the second drying tower (2), the third drying tower (3) and the fourth drying tower (19).

6. The system according to claim 5, characterized in that the external heating means comprise a first heating tower (17) and a second heating tower (18), the first heating tower (17) being used in series or in parallel with the second heating tower (18).

7. The system according to claim 1, further comprising a deoxygenation device (11), the deoxygenation device (11) being configured to deoxygenate the crude hydrogen to produce deoxygenated crude hydrogen; the deoxidizing crude hydrogen outlet of the deoxidizing device (11) is respectively communicated with the first gas inlet of the first drying tower (1), the second gas inlet of the second drying tower (2), the third gas inlet of the third drying tower (3) and the fourth gas inlet of the fourth drying tower (19) for introducing deoxidizing crude hydrogen into the working drying tower.

8. The system according to claim 7, characterized in that the system further comprises a crude hydrogen cooling separation unit (12); the crude hydrogen cooling separation unit (12) comprises a crude hydrogen cooler and a crude hydrogen water separator; the crude hydrogen cooler comprises a crude hydrogen cooling inlet and a crude hydrogen cooling outlet, and the crude hydrogen water separator comprises a crude hydrogen separation inlet, a crude hydrogen separation gas phase outlet and a crude hydrogen separation liquid phase outlet; the crude hydrogen cooling outlet of the crude hydrogen cooler is communicated with a crude hydrogen separation inlet of the crude hydrogen water separator, and a crude hydrogen separation gas phase outlet of the crude hydrogen water separator is respectively communicated with a first gas inlet of the first drying tower (1), a second gas inlet of the second drying tower (2), a third gas inlet of the third drying tower (3) and a fourth gas inlet of the fourth drying tower (19);

The crude hydrogen cooling inlet of the crude hydrogen cooler is communicated with a deoxidizing crude hydrogen outlet of the deoxidizing device (11).