CN219032396U - System for preparing high-pressure hydrogen and oxygen by electrolysis - Google Patents
System for preparing high-pressure hydrogen and oxygen by electrolysis Download PDFInfo
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- CN219032396U CN219032396U CN202223592418.5U CN202223592418U CN219032396U CN 219032396 U CN219032396 U CN 219032396U CN 202223592418 U CN202223592418 U CN 202223592418U CN 219032396 U CN219032396 U CN 219032396U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The utility model relates to a system for preparing high-pressure hydrogen and oxygen by electrolysis, belonging to the technical field of preparing hydrogen and oxygen in a pressure electrolytic tank. The system comprises an electrolytic tank, a gas-liquid separation storage tank, a pump, a liquid level sensor, a pipeline and a valve, wherein the electrolytic tank is formed by overlapping and splicing a plurality of layers of electrolytic tank units in a plane, only one gas-liquid separation storage tank is arranged, a partition plate is arranged in the gas-liquid separation storage tank and divides the gas-liquid separation storage tank into two chambers, the chambers are divided into a gas chamber with upper gas storage and a liquid chamber with lower electrolyte storage, and the partition plate extends from the top inner wall of a gas-liquid separator tank to below the electrolytic liquid level and forms a gap with the bottom inner wall of the gas-liquid separator tank. The system can keep the inlet and outlet pressures of the cathode side and the anode side of the electrolytic tank to be consistent all the time through the electrolyte in the liquid chambers which are communicated with each other at the lower parts of the two chambers. And thus the electrolytic cell can stably produce hydrogen and oxygen on the cathode side and the anode side.
Description
Technical Field
The utility model relates to a system for preparing high-pressure hydrogen and oxygen by electrolysis, belonging to the technical field of preparing hydrogen and oxygen in a pressure electrolytic tank.
Background
Hydrogen and oxygen are common industrial and domestic feedstocks, and hydrogen is also an important energy source feedstock. In order to achieve the goal of carbon peak and carbon neutralization, hydrogen is listed in the development target planning of the national hydrogen energy industry as an important green clean energy raw material for replacing the traditional carbon-containing fossil energy raw material. At present, the storage and transportation of hydrogen and oxygen are mostly carried out by adopting a pressure gas storage and transportation mode, including pipeline pressure transportation and pressure tank storage and transportation.
The hydrogen and oxygen are prepared by electrolysis of water solution, which is the prior art for mainly preparing hydrogen and oxygen, but is generally prepared by electrolysis in normal pressure state, and then the prepared hydrogen and oxygen are pressurized by a compressor and then are pumped into a pipeline or a storage tank. The Chinese patent application with publication number CN108692185A discloses a high-pressure high-purity hydrogen production and hydrogenation integrated machine.
In the known pressure electrolysis hydrogen and oxygen circulating system, the hydrogen and the oxygen are separated into gas and liquid and stored. Alkali liquor circulation system of alkaline hydrogen production electrolytic tank disclosed in Chinese patent application publication No. CN113089022A
Working methods. Since one molecule of water generates one hydrogen molecule and one half of the oxygen molecule, more hydrogen is generated than oxygen when the water solution is electrolyzed. Thus, for the separate hydrogen gas-liquid separation tank and oxygen gas-liquid separation tank, the volume and pressure of the gas in the two tanks are different, thereby resulting in an imbalance in the pressure of the entire electrolytic circulation system, and it is difficult to stabilize the hydrogen and oxygen gas at high pressure by electrolysis gas production.
Disclosure of Invention
The utility model aims to solve the technical problems that: how to stably electrolyze and prepare high-pressure hydrogen and oxygen.
The technical scheme provided by the utility model for solving the technical problems is as follows: the system for preparing high-pressure hydrogen and oxygen by electrolysis comprises an electrolytic tank, a gas-liquid separation storage tank, a pump, a liquid level sensor, a pipeline and a valve, wherein the electrolytic tank is formed by overlapping and splicing plane members of a multi-layer electrolytic tank unit, electrolyte which is not filled in the storage tank is filled in the gas-liquid separation storage tank, the electrolytic tank, the gas-liquid separation storage tank, the pump, the pipeline and the valve are of a sealed pressure-resistant structure, an electrolyte outlet of the gas-liquid separation storage tank is connected with an electrolyte inlet of the electrolytic tank through the pump and the pipeline, a gas-liquid reflux port of the gas-liquid separation storage tank is a hydrogen electrolyte reflux port and an oxygen electrolyte reflux port which are respectively arranged on two side walls of the gas-liquid separator tank, the gas-liquid outlet of the electrolytic tank is a hydrogen liquid outlet and an oxygen liquid outlet, the hydrogen electrolyte reflux port is connected with the hydrogen liquid outlet through the pipeline, and the oxygen electrolyte reflux port is connected with the oxygen liquid outlet through the pipeline; the gas-liquid separation tank is provided with a partition board, the gas-liquid separation tank is internally provided with two chambers, the chambers are divided into a gas chamber for storing gas at the upper part and a liquid chamber for storing electrolyte at the lower part, the partition board extends from the top inner wall of the gas-liquid separator tank to below the liquid level of the electrolyte and forms a gap with the bottom inner wall of the gas-liquid separator tank, the two gas chambers at the upper part of the two chambers are separated by the partition board to respectively form a hydrogen chamber for storing hydrogen and an oxygen chamber for storing oxygen, the two liquid chambers at the lower part of the two chambers are respectively used for storing the electrolyte and are communicated with each other below the partition board, an electrolyte outlet is arranged at the bottom of the gas-liquid separator tank and is communicated with the liquid chamber, a hydrogen electrolyte reflux port is communicated with the hydrogen chamber, and an oxygen electrolyte reflux port is communicated with the oxygen chamber.
Further, the liquid level sensor comprises a high-level liquid level sensor arranged on the inner wall of the upper part side of the gas-liquid separator tank and a low-level liquid level sensor arranged on the inner wall of the lower part side of the gas-liquid separator tank, and the position of the low-level liquid level sensor is higher than the lower end of the partition plate; the gas-liquid separator tank is provided with a hydrogen gas outlet communicated with the hydrogen gas chamber at one side of the hydrogen gas chamber, and an oxygen gas outlet communicated with the oxygen gas chamber at one side of the oxygen gas chamber; the hydrogen gas outlet is provided with a first electromagnetic valve on an external pipeline, the oxygen gas outlet is provided with a second electromagnetic valve on an external pipeline, and the electromagnetic valve is opened and closed according to a sensing signal of the liquid level sensor.
Further, a liquid adding opening is formed in the side wall of the gas-liquid separator tank, and a sealing cover is arranged on the liquid adding opening.
Further, the high-level liquid level sensor comprises a first high-level liquid level sensor close to one side of the hydrogen chamber and a second high-level liquid level sensor close to one side of the oxygen chamber, and the low-level liquid level sensor comprises a first low-level liquid level sensor close to one side of the hydrogen chamber and a second low-level liquid level sensor close to one side of the oxygen chamber.
Further, the gap is 20mm or more.
The beneficial effects of the utility model are as follows: because of a specially designed single gas-liquid separator tank, an upper gas chamber and a lower liquid chamber are formed in the two chambers by separating the two chambers by a partition plate in the gas-liquid separator tank, so that not only is hydrogen and oxygen discharged from an electrolytic tank stored separately, but also electrolyte discharged from a cathode side of the electrolytic tank and electrolyte discharged from an anode side of the electrolytic tank are mixed into a whole in the gas-liquid separator tank; therefore, even if the gas volumes and pressures of the two gas chambers (the hydrogen gas chamber and the oxygen gas chamber respectively) are different, the inlet and outlet pressures of the cathode side and the anode side of the electrolytic cell can be kept consistent all the time through the electrolyte in the liquid chamber which is communicated with each other at the lower parts of the two chambers. And thus the electrolytic cell can stably produce hydrogen and oxygen on the cathode side and the anode side. Further, through level sensor, hydrogen gas outlet and the oxygen outlet that set up on the gas-liquid separator jar, when two air chambers pressure difference of gas-liquid separator jar lead to the liquid level of two liquid rooms to change from top to bottom, open through liquid level sensing signal control solenoid valve and diverge some gases (hydrogen or oxygen), just can automatically regulated the liquid level of two liquid rooms, both can avoid the baffle to expose electrolyte liquid level, can reduce the liquid level difference of two liquid rooms again.
Drawings
The system for electrolytically producing high pressure hydrogen and oxygen according to the present utility model will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a system for producing high pressure hydrogen and oxygen by electrolysis according to an embodiment;
FIG. 2 is a schematic view of the structure of the system for electrolytically producing high pressure hydrogen and oxygen of FIG. 1 in use (1);
FIG. 3 is a schematic view of the use case (2) of the system for electrolytically producing high pressure hydrogen and oxygen of FIG. 1;
FIG. 4 is a schematic diagram of a system for producing high pressure hydrogen and oxygen by electrolysis according to the second embodiment.
Detailed Description
Example 1
The system for preparing high-pressure hydrogen and oxygen by electrolysis in this embodiment, as shown in fig. 1, comprises an electrolytic tank 1, a gas-liquid separation storage tank 2, a pump 3, a liquid level sensor, a pipeline 4 and a valve, wherein the electrolytic tank 1 is formed by overlapping and splicing planar members of a multi-layer electrolytic tank unit, and the multi-layer overlapping and splicing structure of the electrolytic tank 1 can adopt the structure disclosed in the prior art (such as the structure disclosed in the chinese patent application "bipolar alkaline water electrolytic unit and electrolytic tank" of publication No. CN104364425 a), and is not described herein again. As shown in fig. 1, the gas-liquid separation tank 2 is filled with electrolyte 5 which is not filled with the gas-liquid separation tank 2; the electrolytic tank 1, the gas-liquid separation storage tank 2, the pump 3, the pipeline 4 and the valves are all of a sealed pressure-resistant structure. As shown in fig. 1, an electrolyte outlet 6 of a gas-liquid separation storage tank 2 is connected with an electrolyte inlet 7 of an electrolytic tank 1 through a pump 3 and a pipeline 4, gas-liquid reflux ports of the gas-liquid separation storage tank 2 are a hydrogen electrolyte reflux port 8 and an oxygen electrolyte reflux port 9 which are respectively arranged on two side walls of the gas-liquid separation storage tank 2, gas-liquid outlets of the electrolytic tank 1 are a hydrogen liquid outlet 10 and an oxygen liquid outlet 11 respectively, the hydrogen electrolyte reflux port 8 is connected with the hydrogen liquid outlet 10 through a pipeline 4, and the oxygen electrolyte reflux port 9 is connected with the oxygen liquid outlet 11 through a pipeline 4.
As shown in fig. 1, there is only one gas-liquid separation tank 2, a partition plate 12 is provided in the gas-liquid separation tank 2 and divides the gas-liquid separation tank 2 into two chambers, the chambers are divided into a gas chamber for upper gas storage and a liquid chamber for lower electrolyte storage, the partition plate 12 extends from the top inner wall of the gas-liquid separator tank 2 to below the liquid level of the electrolyte 5 and forms a gap d with the bottom inner wall of the gas-liquid separator tank 2 (i.e., a gap between the lower edge of the partition plate 12 and the bottom inner wall of the gas-liquid separator tank 2), and the gap d is determined according to practical needs and should be generally larger than 20mm at least. The two air chambers at the upper parts of the two chambers are separated by a partition plate to form a hydrogen chamber 13 for storing hydrogen and an oxygen chamber 14 for storing oxygen respectively, the two liquid chambers at the lower parts of the two chambers are respectively used for storing electrolyte 5 and are communicated with each other below the partition plate 12, an electrolyte outlet 6 is arranged at the bottom of the gas-liquid separator tank 2 and is communicated with the liquid chamber, a hydrogen electrolyte return port 8 is communicated with the hydrogen chamber 13, and an oxygen electrolyte return port 9 is communicated with the oxygen chamber 14.
As shown in fig. 1, the liquid level sensor includes a liquid level sensor provided on an upper side inner wall of the gas-liquid separator tank 2 and a low level liquid level sensor provided on a lower side inner wall of the gas-liquid separator tank, wherein: the liquid level sensor comprises a first liquid level sensor 15 close to the hydrogen gas chamber 13 and a second liquid level sensor 16 close to the oxygen gas chamber 14, and the low-level liquid level sensor comprises a first low-level liquid level sensor 17 close to the hydrogen gas chamber 13 and a second low-level liquid level sensor 18 close to the oxygen gas chamber 14; the low level sensors (the first low level sensor 17 and the second low level sensor 18) are each located slightly higher than the lower end of the partition 12. The first level sensor 15 and the second level sensor 16 can determine the level of electrolyte in both chambers by measuring the distance to the level of electrolyte.
As shown in fig. 1, the gas-liquid separator tank 2 is provided with a hydrogen gas discharge port 19 communicating with the hydrogen gas chamber 13 on the hydrogen gas chamber 13 side, and the gas-liquid separator tank 2 is provided with an oxygen gas discharge port 20 communicating with the oxygen gas chamber 14 on the oxygen gas chamber 14 side; the hydrogen gas discharge outlet 19 is provided with a first three-way valve 21, one outlet of the first three-way valve 21 is externally connected with a hydrogen gas output pipeline 22, the hydrogen gas output pipeline 22 is provided with a first electromagnetic valve 23, and the other outlet of the first three-way valve 21 is externally connected with a hydrogen gas diffusion pipeline 24; similarly, the oxygen outlet 20 is also provided with a second three-way valve 25, one outlet of the second three-way valve 25 is externally connected with an oxygen output pipeline 26, the oxygen output pipeline 26 is provided with a second electromagnetic valve 27, and the other outlet of the electromagnetic valve of the second three-way valve 25 is externally connected with an oxygen diffusion pipeline 28. The solenoid valve (including the first solenoid valve 23 and the second solenoid valve 27) is opened and closed according to the sensing signals of the liquid level sensors (including the two high-level liquid level sensors and the two low-level liquid level sensors).
In addition, a liquid filling port 29 is provided in the top wall of the gas-liquid separator tank 2, and a seal cover 30 is provided in the liquid filling port 29. Of course, the filling opening 29 may also be provided in the side wall of the gas-liquid separator tank 2 at a position higher than the two first liquid level sensors 15 and the second liquid level sensor 16.
As shown in fig. 1, the separator 12 is slightly biased to one side in the gas-liquid separator tank 2 so that the two chambers are different in size, wherein the volume of the hydrogen chamber 13 is larger than the volume of the oxygen chamber 14.
As shown in fig. 1, a pressure electric contact pressure gauge 33 is provided at the top of the gas-liquid separator tank 2.
The system of this embodiment is used as follows:
the sealing cover 24 is opened, the diverging valves on the external connecting pipes of the hydrogen gas discharge port 19 and the oxygen gas discharge port 20 are opened, and the electrolyte 5 (such as water, caustic potash or caustic soda and other alkaline solutions) is added into the gas-liquid separator tank 2, and generally the volume of the electrolyte 5 added into the gas-liquid separator tank 2 is 2/3 of the volume in the gas-liquid separator tank 2. The sealing cover 24 is covered, valves on external connecting pipelines of the hydrogen gas outlet 19 and the oxygen gas outlet 20 are closed, the pump 2 is started to work, electrolyte 5 flows into the electrolyte inlet 7 of the electrolytic tank 1 through the electrolyte outlet 6, the electrolyte 5 flows into the cathode side and the anode side respectively after entering the electrolytic tank 1 from the electrolyte inlet 7, and hydrogen and oxygen generated after electrolysis flow into the hydrogen electrolyte reflux port 8 and the oxygen electrolyte reflux port 9 of the gas-liquid separator tank 2 through the pipeline 4 together with the rest of the non-electrolyzed electrolyte 5 from the hydrogen gas outlet 10 and the oxygen gas outlet 11 of the electrolytic tank 1 respectively. After the hydrogen gas and the residual electrolyte 5 entering the gas-liquid separator tank 2 are separated, the hydrogen gas is accumulated in the hydrogen chamber 13; after the oxygen gas and the residual electrolyte 5 entering the gas-liquid separator tank 2 are separated, the oxygen gas is accumulated in the oxygen chamber 14; the separated electrolyte 5 falls into a liquid chamber for mixing, and the liquid level of the electrolyte 5 is always higher than the lower end of the separator 12. Electrolyte 5 is thus pumped back into the gas-liquid separator tank 2 after being pumped into the electrolytic tank 1, and is pumped into the electrolytic tank 1 again, thus continuously circulating, as the amount of hydrogen and oxygen generated by electrolysis increases and accumulates in the gas-liquid separator tank 2, the pressure in the gas-liquid separator tank 2 increases and the pressure in the system of the whole circulation continuously increases, the pressure change is only formed in the gas-liquid separator tank 2, and the inlet and outlet pressures on the cathode side and the anode side are identical when the changed pressure is transmitted to the electrolytic tank 1 through the electrolyte 5, so that the electrolysis of the electrolytic tank 1 is not affected. When the pressure reaches the required pressure value (such as 10 MPa), the valves on the external hydrogen output pipeline 22 and the oxygen output pipeline 26 of the hydrogen outlet 19 and the oxygen outlet 20 can be controlled to be opened, and high-pressure hydrogen and oxygen can be output outwards. When the amount of hydrogen and oxygen generated by electrolysis is equal to the amount of output required, high-pressure hydrogen and oxygen can be continuously and stably supplied to the outside. In the above process, the electrolytic tank 1, the gas-liquid separation tank 2, the pump 3, the piping 4 and the valves are sealed and pressure-resistant. Several conditions that may occur during use are as follows:
(1) as shown in FIG. 2, when the pressure in the hydrogen chamber 13 is insufficient, if the low level sensor 18 sends a signal, the valve on the oxygen diverging line 28 is controlled to diverge part of the oxygen. At this time, if high-pressure hydrogen is needed, the flow valve 31 on the hydrogen output pipeline 22 is adjusted down or the flow valve 32 on the oxygen output pipeline 26 is adjusted up, and when the first liquid level sensor 15 and the second liquid level sensor 16 feed back the electrolyte liquid level leveling signals of the two liquid chambers, the flow valve 31 is adjusted up. At this time, if high-pressure oxygen is needed, the flow valve 32 on the oxygen output pipeline 26 is first properly adjusted to be large or the flow valve 31 is adjusted to be small, and when the first liquid level sensor 15 and the second liquid level sensor 16 feed back the electrolyte liquid level leveling signals of the two liquid chambers, the flow valve 32 is then properly adjusted to be large.
(2) As shown in FIG. 3, when the pressure in the oxygen chamber 14 is insufficient, if the low level sensor 17 sends a signal, the valve on the hydrogen gas diffusion pipeline 24 is controlled to diffuse part of the hydrogen gas. At this time, if high-pressure hydrogen is needed, the flow valve 31 is first appropriately adjusted to be large or the flow valve 32 is first adjusted to be small, and when the first liquid level sensor 15 and the second liquid level sensor 16 feed back the electrolyte liquid level leveling signals of the two liquid chambers, the flow valve 31 is then appropriately adjusted to be small. At this time, if high-pressure oxygen is needed, the flow valve 32 is first appropriately adjusted to be high or the flow valve 31 is first adjusted to be low, and when the first level sensor 15 and the second level sensor 16 feed back the electrolyte level signals of the two liquid chambers, the flow valve 32 is then appropriately adjusted to be low.
(3) When the electrolyte 5 needs to be replenished, the power supply of the electrolytic tank 1 is closed, the pump 3 is closed, the hydrogen and oxygen output pipelines 22 and 26 are closed, the hydrogen and oxygen diffusion pipelines 24 and 28 are opened, when the pressure electric contact pressure gauge 33 of the gas-liquid separation storage tank 2 is displayed as 0, the sealing cover 30 is opened, a proper amount of electrolyte 5 is added, and a proper amount of signal can be provided through the liquid level sensors 15 and 16 for adding.
Example two
A system for preparing high-pressure hydrogen and oxygen by electrolysis according to the present embodiment is an improvement over the first embodiment, as shown in fig. 4, except that the system is the same as the first embodiment, except that: the electrolytic cell 1 adopts a one-inlet two-outlet structure, namely, electrolyte 5 enters the cathode side and the anode side of the electrolytic cell 1 through one channel at the same time, and gas-liquid outlets on the cathode side and the anode side are still separated into two channels.
The foregoing description is only of the preferred embodiments of the utility model, but the utility model is not limited thereto, and all equivalents and modifications according to the concept of the utility model and the technical solutions thereof are intended to be included in the scope of the utility model.
Claims (5)
1. The system for preparing high-pressure hydrogen and oxygen by electrolysis comprises an electrolytic tank, a gas-liquid separation storage tank, a pump, a liquid level sensor, a pipeline and a valve, wherein the electrolytic tank is formed by overlapping and splicing plane members of a multi-layer electrolytic tank unit, electrolyte which is not filled in the storage tank is filled in the gas-liquid separation storage tank, the electrolytic tank, the gas-liquid separation storage tank, the pump, the pipeline and the valve are of a sealed pressure-resistant structure, an electrolyte outlet of the gas-liquid separation storage tank is connected with an electrolyte inlet of the electrolytic tank through the pump and the pipeline, a gas-liquid reflux port of the gas-liquid separation storage tank is a hydrogen electrolyte reflux port and an oxygen electrolyte reflux port which are respectively arranged on two side walls of the gas-liquid separator tank, the gas-liquid outlet of the electrolytic tank is a hydrogen liquid outlet and an oxygen liquid outlet, the hydrogen electrolyte reflux port is connected with the hydrogen liquid outlet through the pipeline, and the oxygen electrolyte reflux port is connected with the oxygen liquid outlet through the pipeline; the hydrogen gas-liquid separation device is characterized in that only one gas-liquid separation storage tank is arranged, a partition plate is arranged in the gas-liquid separation storage tank and divides the gas-liquid separation storage tank into two chambers, the chambers are divided into an upper gas storage chamber and a lower electrolyte storage chamber, the partition plate extends from the top inner wall of the gas-liquid separation tank to below the liquid level of electrolyte and forms a gap with the bottom inner wall of the gas-liquid separation tank, the two gas chambers at the upper part of the two chambers are separated by the partition plate to respectively form a hydrogen gas chamber for storing hydrogen gas and an oxygen gas chamber for storing oxygen gas, the two liquid chambers at the lower part of the two chambers are both used for storing the electrolyte and are communicated with each other below the partition plate, an electrolyte outlet is arranged at the bottom of the gas-liquid separation tank and is communicated with the liquid chamber, a hydrogen electrolyte return port is communicated with the hydrogen gas chamber, and an oxygen electrolyte return port is communicated with the oxygen gas chamber.
2. The system according to claim 1, wherein the liquid level sensor comprises a high-level liquid level sensor arranged on the inner wall of the upper part of the gas-liquid separator tank and a low-level liquid level sensor arranged on the inner wall of the lower part of the gas-liquid separator tank, and the position of the low-level liquid level sensor is higher than the lower end of the baffle plate; the gas-liquid separator tank is provided with a hydrogen gas outlet communicated with the hydrogen gas chamber at one side of the hydrogen gas chamber, and an oxygen gas outlet communicated with the oxygen gas chamber at one side of the oxygen gas chamber; the hydrogen gas outlet is provided with a first electromagnetic valve on an external pipeline, the oxygen gas outlet is provided with a second electromagnetic valve on an external pipeline, and the electromagnetic valve is opened and closed according to a sensing signal of the liquid level sensor.
3. The system of claim 1, wherein the sidewall of the gas-liquid separator tank is provided with a liquid filling opening, and the liquid filling opening is provided with a sealing cover.
4. The system of claim 2, wherein the high level sensor comprises a first high level sensor adjacent to the hydrogen chamber and a second high level sensor adjacent to the oxygen chamber, and wherein the low level sensor comprises a first low level sensor adjacent to the hydrogen chamber and a second low level sensor adjacent to the oxygen chamber.
5. The system of claim 1, wherein the gap is 20mm or greater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223592418.5U CN219032396U (en) | 2022-12-30 | 2022-12-30 | System for preparing high-pressure hydrogen and oxygen by electrolysis |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223592418.5U CN219032396U (en) | 2022-12-30 | 2022-12-30 | System for preparing high-pressure hydrogen and oxygen by electrolysis |
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| CN219032396U true CN219032396U (en) | 2023-05-16 |
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| CN202223592418.5U Active CN219032396U (en) | 2022-12-30 | 2022-12-30 | System for preparing high-pressure hydrogen and oxygen by electrolysis |
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