CN216786269U - Water electrolysis hydrogen production system - Google Patents
Water electrolysis hydrogen production system Download PDFInfo
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- CN216786269U CN216786269U CN202220512980.3U CN202220512980U CN216786269U CN 216786269 U CN216786269 U CN 216786269U CN 202220512980 U CN202220512980 U CN 202220512980U CN 216786269 U CN216786269 U CN 216786269U
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Abstract
The utility model discloses a hydrogen production system by electrolyzing water, which comprises an electrolytic bath, a hydrogen side gas separator, an oxygen side gas separator, a hydrogen side control unit and an oxygen side control unit; the hydrogen production side of the electrolytic cell is connected with a hydrogen side gas separator through a hydrogen conveying pipeline, the output end of the hydrogen side gas separator is connected with the input end of a hydrogen side control unit, and the output end of the hydrogen side control unit is sequentially connected with a hydrogen side purification module and a hydrogen side drying module; the oxygen production side of the electrolytic cell is connected with an oxygen side gas separator through an oxygen conveying pipeline, the output end of the oxygen side gas separator is connected with the input end of an oxygen side control unit, and the output end of the oxygen side control unit is sequentially connected with an oxygen side purification module and an oxygen side drying module; the hydrogen side control unit and the oxygen side control unit respectively comprise a regulating main circuit, a regulating auxiliary circuit and an emptying branch circuit which are connected in parallel. The utility model can safely, continuously and efficiently prepare hydrogen by connecting the adjusting auxiliary circuit, the emptying branch circuit and the like in parallel in the control unit.
Description
Technical Field
The utility model relates to the technical field of hydrogen production, in particular to a water electrolysis hydrogen production system.
Background
The product of hydrogen combustion is water, is the cleanest energy in the world, has rich resources and sustainable development, and is regarded as the clean energy with the most development potential in the 21 st century. The technology of hydrogen preparation, storage, transportation and application will also become the focus of much attention in the 21 st century. The hydrogen production by electrolyzing water is green and environment-friendly, flexible in production, high in purity and very wide in market application prospect. The water electrolysis hydrogen production technology mainly comprises three technologies of alkaline water electrolysis (ALK), proton exchange membrane water electrolysis (PEM) and solid oxide water electrolysis (SOE), and the most mature technical route at present is the alkaline water electrolysis technology.
The hydrogen production method by electrolyzing water is that direct current is introduced into an electrolytic tank filled with electrolyte, water molecules are subjected to electrochemical reaction on an electrode and decomposed into hydrogen and oxygen, then the hydrogen and oxygen enter a hydrogen separator and an oxygen separator respectively, and under the action of gravity, gas is upward, alkali liquor is downward, and the hydrogen and oxygen are separated from the electrolyte. In the process, the liquid level balance in the hydrogen separator and the oxygen separator needs to be ensured, and the eruption danger is avoided. In the prior art, most of control units adopt one-way regulation, if a control circuit breaks down, the liquid level in the separator continuously deviates, potential safety hazards are generated, the production efficiency is influenced, and the one-way regulation efficiency is low under the condition of large flow.
SUMMERY OF THE UTILITY MODEL
Based on the technical problem, the utility model provides a system for producing hydrogen by electrolyzing water.
The technical solution adopted by the utility model is as follows:
a hydrogen production system by water electrolysis comprises an electrolytic cell, a hydrogen side gas separator, an oxygen side gas separator, a hydrogen side control unit and an oxygen side control unit;
the hydrogen production side of the electrolytic cell is connected with a hydrogen side gas separator through a hydrogen conveying pipeline, the output end of the hydrogen side gas separator is connected with the input end of a hydrogen side control unit, and the output end of the hydrogen side control unit is sequentially connected with a hydrogen side purification module and a hydrogen side drying module;
the oxygen production side of the electrolytic cell is connected with an oxygen side gas separator through an oxygen conveying pipeline, the output end of the oxygen side gas separator is connected with the input end of an oxygen side control unit, and the output end of the oxygen side control unit is sequentially connected with an oxygen side purification module and an oxygen side drying module;
the hydrogen side control unit and the oxygen side control unit respectively comprise a main adjusting path, an auxiliary adjusting path and an emptying branch path, and the main adjusting path, the auxiliary adjusting path and the emptying branch path are connected in parallel.
Preferably, the main regulating path is provided with a first on-off valve and a regulating valve which are connected in series; the adjusting auxiliary path is provided with a second on-off valve and a needle valve which are connected in series; the emptying branch comprises a first emptying pipeline and a second emptying pipeline which are connected in parallel, a third cut-off valve is arranged on the first emptying pipeline, and a manual emptying valve is arranged on the second emptying pipeline.
Preferably, the hydrogen side gas separator and the oxygen side gas separator are further connected with an alkali liquor circulating pipeline, the alkali liquor circulating pipeline is communicated with the electrolytic bath, and an alkali liquor circulating pump and an alkali liquor cooler are arranged on the alkali liquor circulating pipeline.
Preferably, the water electrolysis hydrogen production system also comprises an alkali liquor supply device, and the alkali liquor supply device is communicated with the electrolytic tank or the alkali liquor circulating pipeline through an alkali liquor supply pipeline.
Preferably, the hydrogen side gas separator is further connected with a water replenishing pipeline, the water replenishing pipeline is communicated with the water replenishing tank, and a water replenishing pump is arranged on the water replenishing pipeline. The water consumed by electrolysis can be supplemented through the water supplementing pipeline.
Preferably, the regulating valve is an automatic regulating valve.
The beneficial technical effects of the utility model are as follows:
the control unit of the utility model is provided with the adjusting auxiliary circuit which is connected with the adjusting main circuit in parallel, the on-off valve and the needle valve are connected in series on the adjusting auxiliary circuit, when the adjusting main circuit is in fault, the on-off valve on the adjusting auxiliary circuit is opened, and the needle valve continuously and finely adjusts the gas flow, thereby ensuring the continuous operation of the system, continuously generating hydrogen, saving time, and simultaneously avoiding the gas in the gas separator from being held back to cause safety problems.
When the liquid level difference is larger or exceeds a set pressure value, the main adjusting path and the auxiliary adjusting path are adjusted together, the auxiliary adjusting path is adjusted roughly, the main adjusting path is adjusted finely, the liquid level difference is safely and quickly balanced, and the hydrogen production pressure is maintained.
The utility model is also provided with an emptying branch which comprises a manual emptying valve and an on-off valve which are connected in parallel and is used for discharging air at the initial stage of system operation and under special conditions, thereby improving the purity of hydrogen and ensuring the safety.
The utility model can safely, continuously and efficiently prepare hydrogen by connecting the adjusting auxiliary circuit, the emptying branch circuit and the like in parallel in the control unit.
Drawings
The utility model will be further described with reference to the following detailed description and drawings:
FIG. 1 is a schematic diagram of the structural principle of the water electrolysis hydrogen production system of the utility model.
Detailed Description
With reference to the attached drawings, the hydrogen production system by water electrolysis comprises an electrolytic cell 1, a hydrogen side gas separator 2, an oxygen side gas separator 3, a hydrogen side control unit 4 and an oxygen side control unit 5. The hydrogen production side of the electrolytic cell 1 is connected with the hydrogen side gas separator 2 through a hydrogen conveying pipeline 6, the output end of the hydrogen side gas separator 2 is connected with the input end of the hydrogen side control unit 4, and the output end of the hydrogen side control unit 4 is sequentially connected with a hydrogen side purification module 7 and a hydrogen side drying module 8. The oxygen production side of the electrolytic cell 1 is connected with an oxygen side gas separator 3 through an oxygen conveying pipeline 9, the output end of the oxygen side gas separator 3 is connected with the input end of an oxygen side control unit 5, and the output end of the oxygen side control unit 5 is sequentially connected with an oxygen side purification module 12 and an oxygen side drying module 13. The hydrogen side control unit and the oxygen side control unit respectively comprise a main adjusting path 14, an auxiliary adjusting path 15 and an emptying branch path, and the main adjusting path 14, the auxiliary adjusting path 15 and the emptying branch path are connected in parallel.
The main regulating circuit is provided with a first on-off valve 16 and a regulating valve 17 which are connected in series. And a second cut-off valve 18 and a needle valve 19 which are connected in series are arranged on the adjusting auxiliary circuit. The emptying branch comprises a first emptying pipeline 20 and a second emptying pipeline 21 which are connected in parallel, a third cut-off valve 22 is arranged on the first emptying pipeline 20, and a manual emptying valve 23 is arranged on the second emptying pipeline 21.
As a further design of the utility model, the hydrogen side gas separator 2 and the oxygen side gas separator 3 are further connected with an alkali liquor circulating pipeline 24, the alkali liquor circulating pipeline is communicated with the electrolytic bath, and an alkali liquor circulating pump 25 and an alkali liquor cooler 26 are arranged on the alkali liquor circulating pipeline.
Furthermore, the water electrolysis hydrogen production system also comprises an alkali liquor supply device 10, and the alkali liquor supply device 10 is communicated with the electrolytic tank or the alkali liquor circulating pipeline through an alkali liquor supply pipeline 11.
Furthermore, the hydrogen production system by electrolyzing water further comprises a water replenishing pipeline 27, wherein the water replenishing pipeline 27 is connected between the hydrogen-side gas separator 2 and the water replenishing tank 28, and a water replenishing pump 29 is arranged on the water replenishing pipeline. The water consumed by electrolysis can be supplemented through the water supplementing pipeline.
The regulating valve is an automatic regulating valve.
The electrolytic tank 1 electrolyzes water through the electrodes to generate hydrogen and oxygen, then the generated hydrogen and oxygen respectively enter the hydrogen side gas separator 2 and the oxygen side gas separator 3, gas and alkali liquor are separated under the action of gravity, the separated alkali liquor enters the alkali liquor cooler 26 through the alkali liquor circulating pipeline 24, and after being cooled by the alkali liquor cooler 26, the alkali liquor continuously flows into the electrolytic tank through the alkali liquor circulating pump 25 for recycling. The hydrogen generation amount is about twice of the oxygen generation amount in the same time of electrolysis, and the control unit is used for adjusting the liquid level difference in the separator to keep the liquid level difference in equilibrium. The hydrogen gas flowing out from the hydrogen side gas separator 2 is processed by the hydrogen side purification module 7 and the hydrogen side drying module 8 in sequence, and the finished product hydrogen gas is collected. The oxygen gas flowing out of the oxygen-side gas separator 3 is treated by the oxygen-side purification module 12 and the oxygen-side drying module 13 in this order, and the oxygen gas is discharged.
Since water is continuously consumed in the hydrogen production process by electrolyzing water, the consumed water is continuously replenished by further arranging a water replenishing tank 28 and a water replenishing pump 29.
The utility model also provides an alkali liquor supply device 10 to supply a small amount of lost alkali liquor, and is convenient for periodically replacing the alkali liquor.
The output end of the gas separator is connected to one side of the control unit, the input end of the purification module is connected to one side of the control unit, the internal pressure of the gas separator is balanced by adjusting the liquid level difference in the gas separator, and gas safely enters the purification module.
The main regulation path in the control unit plays a main regulation role, and normally, the main regulation path is switched on, the liquid level difference is balanced, and the auxiliary regulation path is switched off. When the main regulation path is in fault, the auxiliary regulation path is switched on, so that the device can operate continuously, and the gas in the gas separator is prevented from being held back to cause safety problems. When the liquid level difference is large or the hydrogen production pressure exceeds a set value, the adjusting branch and the adjusting auxiliary circuit are both communicated, the adjusting auxiliary circuit is adjusted together for coarse adjustment, and the adjusting main circuit is adjusted for fine adjustment.
The main regulating path comprises a first on-off valve 16 and an automatic regulating valve which are sequentially connected in series, and the automatic regulating valve can accurately regulate the liquid level difference according to the set pressure. The adjusting auxiliary circuit comprises a second stop valve 18 and a needle valve 19 which are sequentially connected in series, and the needle valve 19 can continuously and finely adjust the air flow.
The emptying branch is used for discharging air at the initial operation stage and under special conditions of the system, so that the purity and the safety of hydrogen are improved. The emptying branch comprises a manual emptying valve 23 and a third breaking valve 22 which are connected into the emptying pipeline in parallel.
The separated hydrogen and oxygen respectively pass through the hydrogen and oxygen side purification module and the hydrogen and oxygen side drying module in sequence to obtain purified hydrogen and oxygen. In addition, the oxygen separated by the oxygen-side gas separator 3 may also be discharged directly via the corresponding evacuation branch.
In summary, the present invention discloses a system for producing hydrogen by electrolyzing water, which comprises: an electrolytic cell 1, a hydrogen-side gas separator 2, an oxygen-side gas separator 3, an alkali liquid cooler 26, an alkali liquid supplier 10, an alkali liquid circulating pump 25, a hydrogen-side control unit, an oxygen-side control unit, a hydrogen-side purification module 7, an oxygen-side purification module 12, a hydrogen-side drying module 8, an oxygen-side drying module 13, a makeup water tank 28, and a makeup water pump 29. The electrolytic cell electrolyzes water through the electrodes to generate hydrogen and oxygen, and then the generated hydrogen and oxygen enter the hydrogen-side gas separator and the oxygen-side gas separator, respectively. Through the liquid level difference in the control unit regulation separator, the control unit sets up the regulation auxiliary road, including break-make valve and needle valve, the series connection inserts in proper order, when adjusting the main road trouble, adjusts the auxiliary road switch-on, guarantees that the system lasts the operation, and incessant production hydrogen avoids simultaneously that the gas is held back to breath in the gas separator, causes the safety problem. When the liquid level difference is large or the hydrogen production pressure exceeds a set value, the main adjusting path and the auxiliary adjusting path are both communicated and adjusted together, the auxiliary adjusting path is adjusted roughly, the main adjusting path is adjusted finely, the liquid level difference is safely and quickly balanced, and the pressure is controlled.
And finally, the separated hydrogen and oxygen are respectively treated by a purification module and a drying module, and the finished product gas is collected.
The control method of the water electrolysis hydrogen production system specifically comprises the following steps:
(1) when the system operates, the first on-off valves of the hydrogen side control unit and the oxygen side control unit are opened, the hydrogen production pressure value is set, when the liquid level in the hydrogen side gas separator is lower than the liquid level in the oxygen side gas separator, the hydrogen side control unit operates, and the automatic regulating valve regulates the gas flow until the liquid levels of the hydrogen side gas separator and the oxygen side gas separator are balanced. When the hydrogen production pressure is close to the set value, the oxygen side automatic regulating valve regulates the pressure according to the set pressure, so that the pressure is maintained near the set value.
(2) When the main regulation path is in fault, the auxiliary regulation path is switched on, the second on-off valve of the auxiliary regulation path is opened, the needle valve continuously and finely regulates the gas flow, the continuous operation of the system is ensured, the hydrogen is continuously generated, the time is saved, and meanwhile, the gas in the gas separator is prevented from being held back to cause safety problems.
(3) When the liquid level difference is large or the hydrogen production pressure exceeds a set value, the main adjusting circuit and the auxiliary adjusting circuit are both communicated, the main adjusting circuit and the auxiliary adjusting circuit are adjusted together to be roughly adjusted, the main adjusting circuit is adjusted to be finely adjusted, the liquid level difference is safely and quickly balanced, and the pressure is controlled.
The method further comprises the following steps: the gas can be discharged through the emptying branch at the initial operation stage of the system and under special conditions, so that the hydrogen purity is improved and the safety is ensured.
The method comprises the following steps: the separated hydrogen sequentially passes through the hydrogen side purification module and the hydrogen side drying module to obtain purified hydrogen.
Parts not described in the above modes can be realized by adopting or referring to the prior art.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A system for producing hydrogen by electrolyzing water is characterized in that: comprises an electrolytic bath, a hydrogen side gas separator, an oxygen side gas separator, a hydrogen side control unit and an oxygen side control unit;
the hydrogen production side of the electrolytic cell is connected with a hydrogen side gas separator through a hydrogen conveying pipeline, the output end of the hydrogen side gas separator is connected with the input end of a hydrogen side control unit, and the output end of the hydrogen side control unit is sequentially connected with a hydrogen side purification module and a hydrogen side drying module;
the oxygen production side of the electrolytic cell is connected with an oxygen side gas separator through an oxygen conveying pipeline, the output end of the oxygen side gas separator is connected with the input end of an oxygen side control unit, and the output end of the oxygen side control unit is sequentially connected with an oxygen side purification module and an oxygen side drying module;
the hydrogen side control unit and the oxygen side control unit respectively comprise a main adjusting path, an auxiliary adjusting path and an emptying branch path, and the main adjusting path, the auxiliary adjusting path and the emptying branch path are connected in parallel.
2. A system for producing hydrogen by electrolyzing water as claimed in claim 1, wherein: the main regulating path is provided with a first on-off valve and a regulating valve which are connected in series; the adjusting auxiliary path is provided with a second on-off valve and a needle valve which are connected in series; the emptying branch comprises a first emptying pipeline and a second emptying pipeline which are connected in parallel, a third cut-off valve is arranged on the first emptying pipeline, and a manual emptying valve is arranged on the second emptying pipeline.
3. A system for producing hydrogen by electrolyzing water as claimed in claim 1, wherein: the hydrogen side gas separator and the oxygen side gas separator are also connected with an alkali liquor circulating pipeline which is communicated with the electrolytic bath, and an alkali liquor circulating pump and an alkali liquor cooler are arranged on the alkali liquor circulating pipeline.
4. A system for producing hydrogen by electrolyzing water as claimed in claim 3, wherein: the device also comprises an alkali liquor supply device which is communicated with the electrolytic tank or the alkali liquor circulating pipeline through an alkali liquor supply pipeline.
5. A system for producing hydrogen by electrolyzing water as claimed in claim 1, wherein: the hydrogen side gas separator is also connected with a water replenishing pipeline, the water replenishing pipeline is communicated with a water replenishing tank, and a water replenishing pump is arranged on the water replenishing pipeline.
6. A system for producing hydrogen by electrolyzing water as claimed in claim 2, wherein: the regulating valve is an automatic regulating valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220512980.3U CN216786269U (en) | 2022-03-10 | 2022-03-10 | Water electrolysis hydrogen production system |
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| CN202220512980.3U CN216786269U (en) | 2022-03-10 | 2022-03-10 | Water electrolysis hydrogen production system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115261927A (en) * | 2022-08-15 | 2022-11-01 | 中国华能集团清洁能源技术研究院有限公司 | Safe operation method of alkaline water electrolysis device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115261927A (en) * | 2022-08-15 | 2022-11-01 | 中国华能集团清洁能源技术研究院有限公司 | Safe operation method of alkaline water electrolysis device |
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