CN115140712A - Alkaline electrolyzed water hydrogen production system, oxygen impurity removal protection device and protection method thereof - Google Patents
Alkaline electrolyzed water hydrogen production system, oxygen impurity removal protection device and protection method thereof Download PDFInfo
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Abstract
The application provides an alkaline electrolyzed water hydrogen production system, an oxygen impurity removal protection device and a protection method thereof, wherein the protection device is used for connecting an oxygen separator of the alkaline electrolyzed water hydrogen production system; the protection device comprises oxygen purification equipment, oxygen storage equipment, a first stop valve and an air pump; the oxygen purification equipment is connected to the oxygen separator and used for purifying and decontaminating crude oxygen from the oxygen separator, and the oxygen purification equipment is also connected to the oxygen storage equipment and used for storing obtained pure oxygen into the oxygen storage equipment; the oxygen storage device is connected to the oxygen separator through the air pump and the first stop valve and is used for introducing the stored oxygen into the oxygen separator when the alkaline electrolyzed water hydrogen production system is in a low-load working mode so as to reduce the content of hydrogen impurities in the oxygen separator and further protect the alkaline electrolyzed water hydrogen production system.
Description
Technical Field
The application relates to the technical field of hydrogen production by water electrolysis, in particular to a hydrogen production system by alkaline water electrolysis, and an oxygen impurity removal protection device and a protection method thereof.
Background
The water electrolysis hydrogen production technology is a very promising technology for converting electric energy into chemical energy, and has great development space in the utilization field of fluctuating renewable energy sources. The water electrolysis device can be used for directly converting electric energy generated by renewable energy sources such as fluctuating photovoltaic energy, wind power energy, abundant hydropower, wave energy, tidal energy and the like into chemical energy in hydrogen, and further converting the electric energy into other chemical products or using the chemical products as fuel, so that the large-scale and long-time storage of the energy is realized. The water electrolysis device can also be used in the peak-shaving frequency-modulation scene of the power system. The alkaline water electrolysis hydrogen production technology is the most mature large-scale hydrogen production technology at present, but the performance of the alkaline water electrolysis hydrogen production system is limited by the content of hydrogen impurities in oxygen in the system, and the content of hydrogen in the oxygen in the system can exceed the safety value of 4% (the industrial requirement is usually 2%) during low-load work, so that the risk of explosion is caused. The alkaline water electrolysis hydrogen production system is divided into two strategy types of independent alkali liquor circulation and mixed alkali liquor circulation, wherein the mixed alkali liquor circulation strategy type is widely used due to a simpler system structure and a more concise control strategy, but the defect of the system is that the content of hydrogen impurities in oxygen is increased.
In order to solve the problem that the flexible operation range of the system is small due to the increase of the content of hydrogen impurities in oxygen under the low load of the alkaline water electrolysis hydrogen production system, the content of the hydrogen impurities in the oxygen separator needs to be reduced by a design scheme. Chinese patent
CN211872097U relates to a wide power hydrogen production system by water electrolysis, wherein a rectifier transformer is connected with a fluctuating power supply, hydrogen and oxygen are separated from alkali liquor by a separator, and the hydrogen and oxygen are purified by a gas cooler and a gas drip catcher. The patent describes the structure of the hydrogen production system by alkaline electrolysis of water, but the problem of mixed hydrogen and oxygen impurities cannot be solved, and the adjustable range of the system power is limited.
CN111663150B relates to a fluctuation type power input hydrogen production method and device by water electrolysis, wherein the fluctuation type input power is distributed into electrolysis power and heat storage power, the heat storage power is used for cold start of equipment, and the electrolysis power is used for providing electric energy for water electrolysis. The problem of fluctuation type power supply input is solved from power supply side power distribution, but fluctuation amplitude of fluctuation renewable energy sources is quite large and cannot reach electrolysis power of an electrolytic cell many times, so that the problem that hydrogen impurities in oxygen exceed standards when an alkaline electrolytic water system works at low load cannot be solved.
CN113005470A relates to a hydrogen production control method and device, electronic equipment and a storage medium, and the output molar flow of hydrogen produced by an electrolyte is controlled in real time based on a hydrogen-oxygen ratio so as to control the hydrogen-oxygen ratio to be far away from an explosion point, thereby improving the safety of hydrogen production and further improving the flexibility of hydrogen production. This patent does not require additional equipment, but requires a change in system pressure, which can affect the operation of the subsequent hydrogen treatment system.
Disclosure of Invention
The present application has been made in view of the state of the art described above. The application aims to provide an alkaline electrolyzed water hydrogen production system, an oxygen impurity removal protection device and a protection method thereof, which can reduce the content of hydrogen impurities in oxygen of the alkaline electrolyzed water hydrogen production system and ensure that the alkaline electrolyzed water hydrogen production system can safely operate under low load.
The embodiment of the application provides an oxygen impurity removal protection device of an alkaline electrolyzed water hydrogen production system, which is used for connecting an oxygen separator of the alkaline electrolyzed water hydrogen production system; the protection device comprises oxygen purification equipment, oxygen storage equipment, a first stop valve and an air pump;
the oxygen purification equipment is connected to the oxygen separator and used for purifying and decontaminating crude oxygen from the oxygen separator, and the oxygen purification equipment is also connected to the oxygen storage equipment and used for storing obtained pure oxygen into the oxygen storage equipment;
the oxygen storage device is connected to the oxygen separator through the air pump and the first stop valve and is used for introducing the stored oxygen into the oxygen separator through the air pump and the first stop valve when the alkaline electrolyzed water hydrogen production system is in a low-load working mode so as to reduce the content of hydrogen impurities in the oxygen separator.
In at least one possible embodiment, the oxygen impurity removal protection device of the alkaline electrolyzed water hydrogen production system further comprises a first regulating valve, a second stop valve and a third stop valve, the oxygen purification device is connected to the oxygen separator through the first regulating valve and the second stop valve, and the oxygen purification device is connected to the oxygen storage device through the third stop valve.
In at least one possible embodiment, in the oxygen impurity removal protection device of the alkaline electrolyzed water hydrogen production system, the oxygen purification device has two sets of device groups, and the two sets of device groups are connected in parallel between the oxygen separator and the oxygen storage device through the respective second stop valve and the third stop valve, so that the two sets of device groups can alternately enter the purification and regeneration stages.
In at least one possible embodiment, the oxygen impurity removal protection device of the alkaline electrolyzed water hydrogen production system further comprises a second regulating valve connected to the oxygen storage device and used for regulating the pressure in the oxygen storage device.
In at least one possible embodiment, in the oxygen impurity removal protection device of the alkaline electrolyzed water hydrogen production system, the oxygen purification device only has one set of device group, the protection device further comprises an oxygen emptying flow path, the oxygen emptying flow path is connected to the oxygen separator through the first regulating valve, and the oxygen emptying flow path comprises a fourth stop valve therein and is used for discharging oxygen which does not flow through the oxygen purification device.
Embodiments of the present application also provide an alkaline electrolyzed water hydrogen production system comprising: the hydrogen separator and the oxygen separator are connected to the electric pile through the circulating pump; and the oxygen impurity removal protection device of the alkaline electrolyzed water hydrogen production system.
The embodiment of the application also provides an oxygen impurity removal protection method for an alkaline electrolyzed water hydrogen production system, when the alkaline electrolyzed water hydrogen production system is in a low-load working mode, oxygen stored in the oxygen storage device is introduced into the oxygen separator through the air pump and the first stop valve, so as to reduce the content of hydrogen impurities in the oxygen separator; when the alkaline water electrolysis hydrogen production system is in a high-load working mode, the air pump and the first stop valve are closed, and the protection device does not perform impurity removal protection on the oxygen separator.
In at least one possible embodiment, in the oxygen impurity removal protection method for the alkaline electrolyzed water hydrogen production system, when the alkaline electrolyzed water hydrogen production system is in the low-load operating mode, the rate of introducing oxygen into the oxygen separator is the oxygen flow rate in rated operation, or when the alkaline electrolyzed water hydrogen production system is in the low-load operating mode, the rate of introducing oxygen into the oxygen separator is the optimized oxygen introduction amount calculated according to the load of a cell stack of the alkaline electrolyzed water hydrogen production system.
The embodiment of the application also comprises an oxygen impurity removal protection method of the alkaline water electrolysis hydrogen production system, which uses the oxygen impurity removal protection device of the alkaline water electrolysis hydrogen production system, wherein when the alkaline water electrolysis hydrogen production system is in a low-load working mode, oxygen stored in the oxygen storage device is introduced into the oxygen separator through the air pump and the first stop valve, so as to reduce the content of hydrogen impurities in the oxygen separator; when the alkaline electrolyzed water hydrogen production system is in a high-load working mode, the air pump and the first stop valve are closed, the protection device does not carry out impurity removal protection work on the oxygen separator, and the pressure in the oxygen separator is regulated by the first regulating valve.
The embodiment of the application also comprises an oxygen impurity removal protection method of the alkaline electrolyzed water hydrogen production system, and an oxygen impurity removal protection device of the alkaline electrolyzed water hydrogen production system is used, wherein when the alkaline electrolyzed water hydrogen production system is in a low-load working mode, oxygen stored in the oxygen storage device is introduced into the oxygen separator through the air pump and the first stop valve so as to reduce the content of hydrogen impurities in the oxygen separator,
when the alkaline electrolyzed water hydrogen production system is in a high-load working mode, the air pump and the first stop valve are closed, the protection device does not perform impurity removal protection on the oxygen separator, the oxygen purification equipment intermittently works, and if the oxygen in the oxygen storage equipment is insufficient, a part of oxygen is extracted from the oxygen separator through the first regulating valve and the second stop valve to remove impurities and is stored in the oxygen storage equipment for later use.
Drawings
FIG. 1 is a schematic diagram of an alkaline electrolyzed water hydrogen production system according to one embodiment of the present application.
FIG. 2 is a schematic diagram of an alkaline electrolyzed water hydrogen production system that includes a pure oxygen backflow protection device according to a first embodiment of the present application.
Fig. 3 is a schematic diagram of an alkaline electrolyzed water hydrogen production system including a partial oxygen recycle protection device according to a second embodiment of the present application.
Description of the reference numerals
100. Electric pile
200. Circulating pump
300. Hydrogen separator
400. Hydrogen purification equipment
500. Oxygen separator
11. Hydrogen gas flow path regulating valve
12. 13, 14 hydrogen gas flow path stop valve
21. First regulating valve
35. Second regulating valve
23. First stop valve
31. 32, 41 second stop valve
36. 37, 43 third stop valve
22. 45 fourth stop valve
24. Air pump
33. 42 oxygen purification equipment
34. 44 oxygen storage device
Detailed Description
To more clearly illustrate the above objects, features and advantages of the present application, exemplary embodiments of the present application are described below with reference to the accompanying drawings. It should be understood that the detailed description is intended only to teach one skilled in the art how to make and use the present application, and is not intended to be exhaustive or to limit the scope of the application.
Embodiments of the present application provide an alkaline electrolyzed water hydrogen production system (hereinafter, sometimes simply referred to as "system"), and an oxygen impurity removal protection device and a protection method for the alkaline electrolyzed water hydrogen production system (hereinafter, sometimes simply referred to as "protection device" and "protection method").
The following briefly introduces the equipment and operation flow of the alkaline water electrolysis hydrogen production system.
As shown in fig. 1, 2 and 3, the alkaline electrolyzed water hydrogen production system can comprise a galvanic pile 100, a circulating pump 200, a hydrogen separator 300, an oxygen separator 500 and a water cooler (not shown in the figure, different process coolers are at different positions). The system requiring hydrogen purity may be equipped with a hydrogen purification apparatus 400 and a hydrogen storage apparatus (not shown), and the system requiring oxygen utilization may be equipped with oxygen purification apparatuses 33, 42 and oxygen storage apparatuses 34, 44.
As shown in fig. 1, 2, and 3, the stack 100 decomposes water into hydrogen and oxygen by using electric energy, and the gas enters the hydrogen separator 300 and the oxygen separator 500 from the hydrogen flow path and the oxygen flow path, respectively, to separate the gas from the alkali solution. The lye can be re-pumped into the cell stack 100 by gravity and the circulation pump 200 to form a loop. The hydrogen gas can be introduced into the hydrogen purification apparatus 400 through the hydrogen flow path adjustment valve 11 and the hydrogen flow path shutoff valves 12 and 13, and the purified hydrogen gas can be introduced into the hydrogen storage apparatus through the hydrogen flow path shutoff valve 14. The oxygen can be discharged through the first regulating valve 21 and the fourth stop valve 22 on the oxygen flow path. Or through the first regulating valve 21 and the second shut-off valve 31, 32, 41 into the oxygen purification device 33, 42, the purified oxygen may be passed through the third shut-off valve 36, 37, 43 into the oxygen storage device 34, 44.
The alkaline water electrolysis hydrogen production system can also comprise a water cooler which can cool the alkali liquor and the gas. The cooling water can be cooled before, in and after the hydrogen separator 300 and the oxygen separator 500, and the cooling of the hydrogen and the oxygen can reduce the content of water vapor impurities.
The operation flow of the alkaline water electrolysis hydrogen production system comprises a pure oxygen purging link, and a schematic diagram is shown in fig. 1. A pure oxygen introducing flow path is added to the oxygen separator 500 for purging, and the pure oxygen introducing flow path may include a first cut-off valve 23 and an air pump 24. And pure oxygen is introduced into the oxygen separator 500 for impurity removal protection in the low-load mode of the system, so that sufficient pure oxygen flow in the oxygen separator 500 is ensured in the low-load mode of the system, hydrogen impurities brought by the alkaline electrolyzed water hydrogen production system are diluted, and the purpose of reducing the content of the hydrogen impurities in the oxygen separator 500 and further protecting the alkaline electrolyzed water hydrogen production system is achieved.
Further, the protection method can realize the great reduction of the content of hydrogen impurities in the oxygen of the hydrogen production system by artificially increasing the flow of the oxygen in the oxygen separator 500, and helps the hydrogen production system of alkaline electrolysis water to be in a low-load stage with low safety.
For example, the present application can be divided into two types, namely hydrogen and oxygen utilization and hydrogen utilization only, according to the target product of the alkaline electrolyzed water hydrogen production system, and specifically designs two types of alkaline electrolyzed water hydrogen production systems, and an oxygen impurity removal protection device and a protection method thereof.
First embodiment
The embodiment collects oxygen in a large scale and is suitable for application scenes such as production of medical oxygen.
A first embodiment according to the present application is explained below with reference to fig. 2.
As shown in fig. 2, the oxygen impurity removal protection device of the first embodiment of the present application may include a first regulating valve 21, a second regulating valve 35, a first cut-off valve 23, second cut-off valves 31 and 32, third cut-off valves 36 and 37, an oxygen purification apparatus 33, an oxygen storage apparatus 34, and an air pump 24.
Specifically, the alkaline electrolytic water hydrogen production system for collecting and utilizing oxygen on a large scale may be equipped with a corresponding oxygen purification device 33, and the crude oxygen including hydrogen impurities and water vapor impurities from the oxygen separator 500 is passed through a cooler (not shown), a droplet catcher (not shown), or the like to remove most of the water vapor impurities. Then the hydrogen impurities in the oxygen are removed by a catalytic dehydrogenation device in the oxygen purification device 33.
Further, the impurity removal effect of the oxygen purification apparatus 33 is reduced due to the accumulation of impurities, so that the oxygen purification apparatus 33 needs to periodically perform purification and regeneration stages. The oxygen purification equipment 33 in the purification stage normally operates to remove impurities in the crude oxygen in the manner described above, and stores the oxygen after impurity removal into the oxygen storage equipment 34; in the regeneration stage, the second stop valves 31 and 32 and the third stop valves 36 and 37 are closed, high-temperature gas is introduced into the oxygen purification device 33, and gas impurities (not shown in the figure) are adsorbed and carried away, so as to maintain the normal operation of the impurity removal function of the oxygen purification device 33.
For example, the oxygen purification device 33 may have two sets of device groups, and the two sets of devices alternately enter the purification and regeneration stages by controlling the on/off of the second stop valves 31 and 32 and the third stop valves 36 and 37, so as to ensure the orderly and smooth continuous operation of the oxygen purification device 33.
The present embodiment can be divided into two operation modes, i.e., a high load operation mode and a low load operation mode.
When the alkaline water electrolysis hydrogen production system works in a high-load mode, the oxygen production amount is large enough, at the moment, the oxygen separator 500 discharges enough gas through the first regulating valve 21, and the low hydrogen impurity content in the oxygen separator 500 can be maintained even if the circulating oxygen is not used. Therefore, the protection device does not perform impurity removal protection work under high load, namely: the air pump 24 and the first cut-off valve 23 are closed, the first regulating valve 21 is controlled to maintain the internal pressure of the oxygen separator 500, and the second regulating valve 35 is controlled to control the internal pressure of the oxygen storage device 34.
When the alkaline electrolyzed water hydrogen production system works in a low-load mode, the oxygen production amount is relatively insufficient, and at the moment, the oxygen discharged by the oxygen separator 500 through the first regulating valve 21 becomes less, so that the impurity accumulation in the oxygen separator 500 is brought, and the hydrogen impurity content in the lower oxygen in the oxygen separator 500 is not sufficient to be maintained. The protection device works at this moment, namely: the air pump 24 and the first cut-off valve 23 are turned on, the oxygen storage device 34 injects pure oxygen into the oxygen separator 500 at a certain rate while controlling the first regulating valve 21 to maintain the internal pressure of the oxygen separator 500, and the second regulating valve 35 to control the internal pressure of the oxygen storage device 34
Preferably, the oxygen introducing rate can be the oxygen flow rate in rated operation or the optimized oxygen introducing amount calculated according to the load of a galvanic pile of the alkaline water electrolysis hydrogen production system.
Preferably, the first regulating valve 21 may be a membrane regulating valve, and the first cutoff valve 23 may be an air valve.
Second embodiment
This embodiment does not allow for large scale collection of oxygen and only a small fraction of the resulting impure oxygen is extracted for purification and storage.
A second embodiment according to the present application is explained below with reference to fig. 3.
As shown in fig. 3, the oxygen impurity removal protection device of the second embodiment of the present application may include a first adjusting valve 21, a first stop valve 23, a second stop valve 41, a third stop valve 43, an oxygen purification apparatus 42, an oxygen storage apparatus 44, and an air pump 24. The protection means may also comprise an oxygen evacuation flow path comprising a fourth shut-off valve 45 for discharging oxygen that does not flow through the oxygen purification device 42, e.g. directly into the environment or atmosphere.
Specifically, unlike large-scale oxygen collection, the alkaline electrolyzed water hydrogen production system only focusing on hydrogen production does not need to introduce an expensive oxygen purification device, and therefore, additional oxygen impurity removal and purification equipment is required in the embodiment. Similar to the first embodiment, the crude oxygen from the oxygen separator 500, which includes hydrogen impurities and water vapor impurities, is first passed through a cooler (not shown) and a droplet catcher (not shown) to remove water vapor impurities, both of which are less costly; a portion of the oxygen is then purged through oxygen purification device 42 to remove hydrogen impurities and stored in oxygen storage device 44.
Specifically, the protection method does not require pure oxygen of high purity, and therefore, an oxygen purification apparatus 42 of low cost but limited in impurity removal capability can be used. The oxygen purification device can be operated intermittently due to the low demand for oxygen.
The present embodiment can be divided into four modes of high load purification, high load regeneration, low load purification, and low load regeneration.
When the alkaline electrolyzed water hydrogen production system works in a high-load purification mode, the oxygen production amount is large enough, and at the moment, the oxygen separator 500 discharges enough gas through the first regulating valve 21, so that the lower hydrogen impurity content in the oxygen separator 500 can be maintained even if a protection device is not used. Therefore protection device does not carry out edulcoration protection work during high load, promptly: the air pump 24 and the first cut valve 23 are closed, and the first regulating valve 21 is controlled to maintain the internal pressure of the oxygen separator 500. If the oxygen in the oxygen storage device 44 is insufficient, the second stop valve 41 and the third stop valve 43 are opened, and the oxygen purification device 42 extracts a part of the oxygen to remove impurities and stores the part of the oxygen in the oxygen storage device 44 for standby.
When the alkaline electrolyzed water hydrogen production system works in a high-load regeneration mode, the oxygen in the oxygen storage device 44 is sufficient, and the protection device does not perform impurity removal protection. The second stop valve 41 and the third stop valve 43 are closed, high-temperature gas is introduced into the oxygen purification device 42, and gas impurities (not shown in the figure) are adsorbed and carried away, so that the impurity removal function of the oxygen purification device 42 can be maintained to be operated normally. The high load regeneration mode may be followed by either a high load purification or a low load purification mode.
When the alkaline electrolyzed water hydrogen production system works in the low-load purification mode, the oxygen production amount of the system is insufficient, and at this time, the amount of oxygen discharged from the oxygen separator 500 through the first regulating valve 21 is reduced, so that the accumulation of impurities in the oxygen separator 500 may be caused. The protection device then operates, namely: the air pump 24 and the first shut-off valve 23 are opened and the oxygen storage device 44 injects pure oxygen into the oxygen separator 500 at a rate while controlling the first regulating valve 21 to maintain the internal pressure of the oxygen separator 500 and controlling the fourth shut-off valve 45 to maintain the internal pressure of the oxygen storage device 44.
When the system is in the low-load purification mode for a long time, the alkaline electrolytic water hydrogen production system can enter the low-load regeneration mode. The edulcoration effect of oxygen purification equipment 42 can descend because of the impurity accumulation, need regenerate, opens fourth stop valve 45 this moment, closes second stop valve 41, third stop valve 43 and lets in high-temperature gas to oxygen purification equipment 42, adsorbs and takes away gaseous impurity (not shown in the figure) to the edulcoration function of maintaining oxygen purification equipment 42 can normal operating. The air pump 24 and the first stop valve 23 are opened, and the oxygen separator 500 is protected from impurities by the oxygen stored in the oxygen storage device 44.
It will be appreciated that the above described embodiments and some of their aspects or features may be combined as appropriate.
Some advantageous effects of the above-described embodiments of the present application will be briefly described below.
(i) The oxygen impurity removal protection device and method of the alkaline electrolyzed water hydrogen production system can be improved based on the equipment structure in the prior art, most hydrogen impurities in oxygen in the system can be removed, the safe operation of the alkaline electrolyzed water system during low-load operation is ensured, and the operation power range of the system is remarkably enlarged.
(ii) The oxygen impurity removal protection device and method for the alkaline electrolyzed water hydrogen production system utilize a byproduct, namely oxygen, in the electrolyzed water hydrogen production process as part of the protection device, and the oxygen can be obtained through simple gas storage and purification.
(iii) The oxygen impurity removal protection device and method for the alkaline electrolyzed water hydrogen production system are simple in process principle, namely, the content of hydrogen impurities in the oxygen separator is adjusted by using pure oxygen, mature equipment in the chemical field can be used, and industrial practice and large-scale application are easy to perform.
(iv) The oxygen impurity removal protection device and method for the alkaline electrolyzed water hydrogen production system are simple in working operation mode, the pressure of the system does not need to be changed in the operation process, the device and method are suitable for stable operation of the high-pressure alkaline electrolyzed water hydrogen production system, mechanical stress fatigue caused by pressure change of the system can be relieved, and the operation pressure range of the alkaline electrolyzed water system can be expanded.
It will be appreciated that, in the present application, when the number of parts or members is not particularly limited, the number thereof may be one or more, and herein, a plurality means two or more. Where the number of parts or elements shown in the drawings and/or described in the specification is a specific number, e.g. two, three, four, etc., this specific number is generally exemplary and not limiting, and it can be understood that it is plural, i.e. two or more, but it is not meant to exclude one from the present application.
It should be understood that the above embodiments are merely exemplary, and are not intended to limit the present application. Various modifications and alterations of the above-described embodiments may be made by those skilled in the art in light of the teachings of this application without departing from the scope thereof.
(i) For example, the oxygen source that this application can have a variety of, including external oxygen storage tank, air separation pure oxygen, other chemical industry processes produce oxygen, electrolysis water hydrogen manufacturing edulcoration oxygen mode of using by oneself.
(ii) For example, the hydrogen storage device, oxygen storage device of the present application may be a gas cylinder, gas tank, or the like.
Claims (10)
1. An oxygen impurity removal protection device of an alkaline electrolyzed water hydrogen production system is characterized in that,
the protection device is used for connecting an oxygen separator (500) of the alkaline electrolyzed water hydrogen production system;
the protection device comprises an oxygen purification device (33, 42), an oxygen storage device (34, 44), a first stop valve (23) and an air pump (24);
the oxygen purification device (33, 42) is connected to the oxygen separator (500) and is used for purifying crude oxygen from the oxygen separator (500) and removing impurities, and the oxygen purification device (33, 42) is also connected to the oxygen storage device (34, 44) and is used for storing obtained pure oxygen into the oxygen storage device (34, 44);
the oxygen storage device (34, 44) is connected to the oxygen separator (500) through the air pump (24) and the first stop valve (23) and is used for introducing the stored oxygen into the oxygen separator (500) through the air pump (24) and the first stop valve (23) when the alkaline electrolyzed water hydrogen production system is in a low-load operation mode so as to reduce the content of hydrogen impurities in the oxygen separator (500).
2. The oxygen impurity removal protection device of the alkaline electrolyzed water hydrogen production system according to claim 1, characterized by further comprising a first adjusting valve (21), a second stop valve (31, 32, 41) and a third stop valve (36, 37, 43),
the oxygen purification device (33, 42) is connected to the oxygen separator (500) by means of the first regulating valve (21) and the second shut-off valve (31, 32, 41),
the oxygen purification device (33, 42) is connected to the oxygen storage device (34, 44) by means of the third shut-off valve (36, 37, 43).
3. The oxygen impurity removal protection device of the alkaline electrolyzed water hydrogen production system according to claim 2,
the oxygen purification device (33) has two sets of device groups which are connected in parallel between the oxygen separator (500) and the oxygen storage device (34) via the respective second shut-off valve (31, 32) and third shut-off valve (36, 37), so that the two sets of device groups can alternately enter into purification and regeneration phases.
4. The oxygen impurity removal protection device of the alkaline electrolyzed water hydrogen production system as defined in claim 3, further comprising a second regulating valve (35) connected to the oxygen storage device (34) and used for regulating the pressure in the oxygen storage device (34).
5. The oxygen impurity removal protection device of the alkaline electrolyzed water hydrogen production system according to claim 2,
the oxygen purification device (42) has only one set of device groups,
the protection device further comprises an oxygen evacuation flow path which is connected to the oxygen separator (500) via the first regulating valve (21), wherein a fourth stop valve (45) is included in the oxygen evacuation flow path for discharging oxygen which does not flow through the oxygen purification device (42).
6. An alkaline water electrolysis hydrogen production system, characterized by comprising:
a galvanic pile (100);
a circulation pump (200);
a hydrogen separator (300) and an oxygen separator (500), the hydrogen separator (300) and the oxygen separator (500) being connected to the galvanic pile (100) via the circulation pump (200); and
the oxygen impurity removal protection device of the alkaline water electrolysis hydrogen production system according to any one of claims 1 to 5.
7. An oxygen impurity removal protection method for an alkaline electrolyzed water hydrogen production system is characterized in that the alkaline electrolyzed water hydrogen production system is the alkaline electrolyzed water hydrogen production system as claimed in any one of claims 1 to 6,
wherein when the alkaline water electrolysis hydrogen production system is in a low-load working mode, the oxygen stored in the oxygen storage device (34, 44) is introduced into the oxygen separator (500) through the air pump (24) and the first stop valve (23) so as to reduce the content of hydrogen impurities in the oxygen separator (500),
when the alkaline electrolyzed water hydrogen production system is in a high-load working mode, the air pump (24) and the first stop valve (23) are closed, and the protection device does not perform impurity removal protection on the oxygen separator (500).
8. The oxygen impurity removal protection method for the alkaline water electrolysis hydrogen production system according to claim 7, wherein when the alkaline water electrolysis hydrogen production system is in a low-load operation mode, the rate of introducing oxygen into the oxygen separator (500) is an oxygen flow rate in rated operation, or
When the alkaline water electrolysis hydrogen production system is in a low-load working mode, the oxygen introducing rate to the oxygen separator (500) is the optimized oxygen introducing amount calculated according to the load of the galvanic pile of the alkaline water electrolysis hydrogen production system.
9. An oxygen impurity removal protection method of an alkaline electrolyzed water hydrogen production system is characterized in that the oxygen impurity removal protection device of the alkaline electrolyzed water hydrogen production system according to claim 2 is used,
wherein when the alkaline water electrolysis hydrogen production system is in a low-load working mode, oxygen stored in the oxygen storage device (34, 44) is introduced into the oxygen separator (500) through the air pump (24) and the first stop valve (23) so as to reduce the content of hydrogen impurities in the oxygen separator (500),
when the alkaline electrolyzed water hydrogen production system is in a high-load working mode, the air pump (24) and the first stop valve (23) are closed, the protection device does not carry out impurity removal protection work on the oxygen separator (500),
the pressure in the oxygen separator (500) is regulated by the first regulating valve (21).
10. An oxygen impurity removal protection method of an alkaline electrolyzed water hydrogen production system is characterized in that the oxygen impurity removal protection device of the alkaline electrolyzed water hydrogen production system according to claim 5 is used,
wherein when the alkaline water electrolysis hydrogen production system is in a low-load working mode, oxygen stored in the oxygen storage device (44) is introduced into the oxygen separator (500) through the air pump (24) and the first stop valve (23) so as to reduce the content of hydrogen impurities in the oxygen separator (500),
when the alkaline electrolyzed water hydrogen production system is in a high-load working mode, the air pump (24) and the first stop valve (23) are closed, the protection device does not carry out impurity removal protection work on the oxygen separator (500),
the oxygen purification device (42) works intermittently, if the oxygen in the oxygen storage device (44) is insufficient, a part of oxygen is extracted from the oxygen separator (500) through the first regulating valve (21) and the second stop valve (41) to be purified and stored in the oxygen storage device (44) for standby.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210715187.8A CN115140712A (en) | 2022-06-22 | 2022-06-22 | Alkaline electrolyzed water hydrogen production system, oxygen impurity removal protection device and protection method thereof |
| PCT/CN2022/101996 WO2023245699A1 (en) | 2022-06-22 | 2022-06-28 | System for producing hydrogen by alkaline electrolyzed water, and oxygen impurity-removing protection apparatus and protection method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210715187.8A CN115140712A (en) | 2022-06-22 | 2022-06-22 | Alkaline electrolyzed water hydrogen production system, oxygen impurity removal protection device and protection method thereof |
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| Publication Number | Publication Date |
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| CN115140712A true CN115140712A (en) | 2022-10-04 |
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| CN202210715187.8A Pending CN115140712A (en) | 2022-06-22 | 2022-06-22 | Alkaline electrolyzed water hydrogen production system, oxygen impurity removal protection device and protection method thereof |
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| WO (1) | WO2023245699A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3220607B2 (en) * | 1995-01-18 | 2001-10-22 | 三菱商事株式会社 | Hydrogen / oxygen gas generator |
| JP3596558B2 (en) * | 1995-03-23 | 2004-12-02 | 三菱商事株式会社 | High-purity hydrogen / oxygen gas generator |
| CN205710939U (en) * | 2016-06-28 | 2016-11-23 | 青岛中德伊凯新能源科技有限公司 | A kind of generator for separating hydrogen and oxygen by electrolyzing water |
| CN106784960B (en) * | 2016-12-30 | 2020-01-21 | 上海恒劲动力科技有限公司 | Integrated reversible fuel cell system |
| CN110518607B (en) * | 2019-09-30 | 2024-04-16 | 长江勘测规划设计研究有限责任公司 | Hydropower station self-absorption hydrogen and electricity combined power station power utilization system and method |
| CN112626560B (en) * | 2020-12-14 | 2022-04-08 | 阳光电源股份有限公司 | Electrolytic cell equipment, gas recovery device thereof and electrolytic gas recovery method |
| CN216677727U (en) * | 2021-11-11 | 2022-06-07 | 海安建荣制氧有限公司 | High-purity liquid oxygen apparatus for producing |
| CN114574903B (en) * | 2022-02-18 | 2024-01-12 | 广东蓝新氢能源科技有限公司 | Synchronous hydrogen and oxygen production separation system |
| CN217479073U (en) * | 2022-06-22 | 2022-09-23 | 清华大学 | Alkaline electrolyzed water hydrogen production system and oxygen impurity removal protection device thereof |
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- 2022-06-22 CN CN202210715187.8A patent/CN115140712A/en active Pending
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