CN217757693U - High-hydrogen-purity and high-safety electrolytic water alkali liquor circulating system - Google Patents
High-hydrogen-purity and high-safety electrolytic water alkali liquor circulating system Download PDFInfo
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- CN217757693U CN217757693U CN202220657508.9U CN202220657508U CN217757693U CN 217757693 U CN217757693 U CN 217757693U CN 202220657508 U CN202220657508 U CN 202220657508U CN 217757693 U CN217757693 U CN 217757693U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
Abstract
The utility model relates to a water electrolysis hydrogen manufacturing equipment technical field specifically is a high hydrogen purity, high safe electrolysis water alkali lye circulation system, including the hydrogen separator, the oxygen separator, the alkali lye circulating pump, the electrolysis trough, hydrogen side buffer tank and oxygen side buffer tank, the hydrogen separator, the alkali lye circulating pump is connected in proper order through the pipeline respectively to the liquid outlet of oxygen separator, the electrolysis trough inlet, the electrolysis trough gas outlet is respectively through tube coupling to the hydrogen separator, the air inlet of oxygen separator, the liquid outlet of hydrogen separator is connected to the inlet of hydrogen side buffer tank, the alkali lye circulating pump is connected to the liquid outlet of hydrogen side buffer tank, the liquid outlet of oxygen separator is connected to the inlet of oxygen side buffer tank, the alkali lye circulating pump is connected to the liquid outlet of oxygen side buffer tank, hydrogen side buffer tank has the hydrogen gas vent, oxygen side buffer tank has the oxygen gas vent. The mutual mixing of hydrogen and oxygen is effectively avoided, and the running safety of the equipment is improved; the purity of hydrogen on the cathode side and the purity of oxygen on the anode side of the electrolytic cell are improved.
Description
Technical Field
The utility model relates to a building environmental protection equipment technical field specifically is a high hydrogen purity, high safe electrolysis water lye circulation system.
Background
The process for producing hydrogen by electrolyzing water is divided into three technologies, namely alkaline electrolyzed water (AWE), proton exchange membrane electrolyzed water (PEM) and solid oxide electrolyzed water (SOEC), according to different electrolytes, the alkaline electrolyzed water and the proton exchange membrane electrolyzed water are industrialized at present, and the solid oxide electrolyzed water is in a laboratory stage. The alkaline electrolyzed water hydrogen production technology is the most mature, has the characteristics of simple structure, long service life, low selling price and the like of an electrolytic cell, and needs to use 25-30% KOH or NaOH aqueous solution as electrolyte and carry out circular electrolysis on the KOH or NaOH aqueous solution.
In the traditional alkali liquor circulating system, as shown in figure 1, the electrolyzed alkali liquor is divided into two parts and flows out of an electrolytic cell, one part flows out of a cathode electrolytic cell of the electrolytic cell along with hydrogen, the hydrogen is sent to a hydrogen separator for gas-liquid separation, the hydrogen is sent to the downstream, and the alkali liquor is sent to an alkali liquor circulating pump; the other part of the alkali liquor flows out of the anode electrolysis chamber of the electrolysis bath along with the oxygen to the oxygen separator for gas-liquid separation, the oxygen flows downstream, and the alkali liquor is sent to the alkali liquor circulating pump. The alkali liquor from the hydrogen separator and the oxygen separator returns to the cathode electrolysis small chamber and the anode electrolysis small chamber of the electrolytic cell through the alkali liquor circulating pump, the alkali liquor cooler and the alkali liquor flowmeter, and is electrolyzed again to complete a cycle.
A small amount of hydrogen can be dissolved in alkali liquor from a hydrogen separator, a small amount of oxygen can be dissolved in alkali liquor from an oxygen separator, the two parts of alkali liquor are mixed and then enter a cathode electrolysis chamber and an anode electrolysis chamber of an electrolytic cell, the purity of the hydrogen in the cathode electrolysis chamber can be influenced by the oxygen dissolved in the alkali liquor, the purity of the oxygen in the anode electrolysis chamber can be influenced by the hydrogen dissolved in the alkali liquor, the gas yield is small during low-load operation of the electrolytic cell, the influence is more obvious, the purity of the hydrogen and the oxygen is reduced, potential safety hazards exist, low-load (< 30% load) is caused, and alkaline electrolysis hydrogen production equipment cannot operate.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a high hydrogen purity, high safe electrolysis water lye circulation system to solve the dissolved gas in the alkali lye and influence electrolysis trough negative and positive pole gas purity and security problem.
In order to achieve the above purpose, the utility model provides a following technical scheme: high hydrogen purity, high safe electrolysis water alkali lye circulation system include hydrogen separator, oxygen separator, alkali lye circulating pump, electrolysis trough, the liquid outlet of hydrogen separator, oxygen separator connects gradually alkali lye circulating pump, electrolysis trough inlet through the pipeline respectively, the electrolysis trough gas outlet is respectively through the air inlet of tube coupling to hydrogen separator, oxygen separator, on prior art's basis, the utility model discloses further make following improvement: still include hydrogen side buffer tank and oxygen side buffer tank, the liquid outlet of hydrogen separator is connected to the inlet of hydrogen side buffer tank, the alkali lye circulating pump is connected to the liquid outlet of hydrogen side buffer tank, the liquid outlet of oxygen separator is connected to the inlet of oxygen side buffer tank, the alkali lye circulating pump is connected to the liquid outlet of oxygen side buffer tank, hydrogen side buffer tank has the hydrogen gas vent, oxygen side buffer tank has the oxygen gas vent.
Preferably, the hydrogen-side buffer tank is provided with a hydrogen-side level controller and an oxygen-side level controller, the hydrogen-side level controller is arranged on a pipeline between the hydrogen separator and the hydrogen-side buffer tank, and the oxygen-side level controller is arranged on a pipeline between the oxygen separator and the oxygen-side buffer tank.
Preferably, the system also comprises a first pressure controller and a second pressure controller, wherein the first pressure controller is arranged on a pipeline where a hydrogen exhaust port of the hydrogen side buffer tank is located, and the second pressure controller is arranged on a pipeline where an oxygen exhaust port of the oxygen side buffer tank is located.
Preferably, the system also comprises a third pressure controller and a fourth pressure controller, wherein the third pressure controller is arranged on a pipeline where the gas outlet of the hydrogen separator is located, and the fourth pressure controller is arranged on a pipeline where the gas outlet of the oxygen separator is located.
Preferably, the fourth pressure controller controls the pressure at the outlet of the oxygen separator to be 1.6-3.2Mpa, the third pressure controller controls the pressure at the outlet of the hydrogen separator to be 1.6-3.2Mpa, and the third pressure controller controls the pressure at the outlet of the hydrogen separator to be 0.5-1kpa higher than the pressure at the outlet of the oxygen separator.
Preferably, the internal pressure of the hydrogen side buffer tank is controlled to be less than 0.01Mpa by the first pressure controller, and the internal pressure of the oxygen side buffer tank is controlled to be less than 0.01Mpa by the second pressure controller.
Compared with the prior art, the beneficial effects of the utility model are that:
the problems that hydrogen enters the anode electrolysis small chamber through alkali liquor and oxygen enters the cathode electrolysis small chamber through alkali liquor are effectively solved, the mutual mixing of the hydrogen and the oxygen is avoided, and the running safety of equipment is improved; the purity of hydrogen on the cathode side and the purity of oxygen on the anode side of the electrolytic cell can be improved; the purity of hydrogen under low-load operation is improved, the problem that the alkaline electrolytic hydrogen production equipment cannot operate under low load is solved, and the load operation interval of the alkaline electrolytic hydrogen production equipment is widened.
Drawings
FIG. 1 is a schematic structural view of an alkaline solution circulation system for electrolyzing water in the prior art;
FIG. 2 is a schematic view of the structure of the system for electrolyzing aqueous alkali solution of the present invention.
In the figure: the hydrogen separation device comprises a hydrogen separator 1, an oxygen separator 2, an alkali liquor cooler 3, an alkali liquor flow meter 4, an alkali liquor circulating pump 5, an electrolytic bath 6, a first thermometer 7, a second thermometer 8, a hydrogen side buffer tank 9, an oxygen side buffer tank 10, a hydrogen exhaust port 90, an oxygen exhaust port 100, a hydrogen side liquid level controller 11, an oxygen side liquid level controller 12, a first pressure controller 13, a second pressure controller 14, a third pressure controller 15 and a fourth pressure controller 16.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.
Please refer to fig. 2, the utility model provides a high hydrogen purity, high safe electrolysis water alkali lye circulation system, including hydrogen separator 1, oxygen separator 2, alkali lye cooler 3, alkali lye flowmeter 4, alkali lye circulating pump 5, electrolysis trough 6, the liquid outlet of hydrogen separator 1, oxygen separator 2 connects gradually alkali lye circulating pump 5, alkali lye cooler 3, alkali lye flowmeter 4, 6 inlet of electrolysis trough through the pipeline respectively, 6 gas outlets of electrolysis trough are respectively through the air inlet of tube coupling to hydrogen separator 1, oxygen separator 2, still be equipped with first thermometer 7 on the pipeline that 6 gas outlets of electrolysis trough and 1 air inlet of hydrogen separator are connected, still be equipped with second thermometer 8 on the pipeline that 6 gas outlets of electrolysis trough and 2 air inlets of oxygen separator are connected. The electrolysis water alkali lye circulation system of this embodiment still includes hydrogen side buffer tank 9 and oxygen side buffer tank 10, the liquid outlet of hydrogen separator 1 is connected to the inlet of hydrogen side buffer tank 9, alkali lye circulating pump 5 is connected to the liquid outlet of hydrogen side buffer tank 9, the liquid outlet of oxygen separator 2 is connected to the inlet of oxygen side buffer tank 10, alkali lye circulating pump 5 is connected to the liquid outlet of oxygen side buffer tank 10, hydrogen side buffer tank 9 has hydrogen gas vent 90, oxygen side buffer tank 10 has oxygen gas vent 100. The hydrogen side buffer tank 9 and the oxygen side buffer tank 10 play a role in temporarily storing and releasing pressure of the alkali liquor after gas-liquid separation, and gas mixed in the alkali liquor after pressure release is discharged out of the buffer tank and then recycled back to the electrolytic cell, so that on one hand, hydrogen and oxygen mixed in the alkali liquor are prevented from entering the electrolytic cell, and the system safety is improved; on the one hand, the purity of the hydrogen and the oxygen is also improved.
As a preferable embodiment of this embodiment, the electrolyzed water alkaline solution circulation system further comprises a hydrogen side level controller 11 and an oxygen side level controller 12, wherein the hydrogen side level controller 11 is disposed on the pipeline between the hydrogen separator 1 and the hydrogen side buffer tank 9, and the oxygen side level controller 12 is disposed on the pipeline between the oxygen separator 2 and the oxygen side buffer tank 10. The hydrogen-side level controller 11 is used for controlling the liquid level of the hydrogen separator 1, and the oxygen-side level controller 12 is used for controlling the liquid level of the oxygen separator 2.
In a preferred embodiment of this embodiment, the circulation system of electrolyzed water and alkaline solution further comprises a first pressure controller 13 and a second pressure controller 14, wherein the first pressure controller 13 is disposed on the pipeline where the hydrogen outlet 90 of the hydrogen-side buffer tank 9 is located, and the second pressure controller 14 is disposed on the pipeline where the oxygen outlet 100 of the oxygen-side buffer tank 10 is located. The internal pressure of the hydrogen side buffer tank 9 is controlled to be less than 0.01Mpa (micro positive pressure) by the first pressure controller 13, and the internal pressure of the oxygen side buffer tank 10 is controlled to be less than 0.01Mpa (micro positive pressure) by the second pressure controller 14.
As a preferable implementation manner of this embodiment, the electrolyzed water alkaline solution circulation system further includes a third pressure controller 15 and a fourth pressure controller 16, the third pressure controller 15 is disposed on the pipeline where the gas outlet of the hydrogen separator 1 is located, and the fourth pressure controller 16 is disposed on the pipeline where the gas outlet of the oxygen separator 2 is located. The fourth pressure controller 16 controls the pressure of the air outlet of the oxygen separator 2 to be 1.6-3.2Mpa; the third pressure controller 15 controls the pressure of the gas outlet of the hydrogen separator 1 to be 1.6-3.2Mpa which is 0.5-1kpa higher than the pressure of the gas outlet of the oxygen separator 2.
The control method of the high-hydrogen-purity and high-safety electrolytic water alkali liquor circulating system in the embodiment comprises the following steps:
1) The electrolyzed alkali liquor is divided into two parts to be discharged from the electrolytic cell 6, one part is discharged from the cathode of the electrolytic cell 6 along with the hydrogen to the hydrogen separator 1 for gas-liquid separation, and the pressure of the hydrogen separator 1 is controlled to be 1.6-3.2MPa by a third pressure controller 15 and is 0.5-1kpa higher than the pressure of the oxygen separator 2 to send the hydrogen to the downstream;
2) The liquid level of the hydrogen separator 1 is controlled by a hydrogen side liquid level controller 11, the alkali liquor is sent to a hydrogen side buffer tank 9, the pressure of the hydrogen side buffer tank 9 is controlled to be less than 0.01Mpa (micro positive pressure), the pressure of the alkali liquor of the hydrogen separator 1 is reduced in the hydrogen side buffer tank 9, then the gas (most of hydrogen and trace oxygen) dissolved in the alkali liquor is released, the pressure of the hydrogen side buffer tank 9 is controlled by a first pressure controller 13, and the released gas is emptied;
3) The alkali liquor after gas release is sent to an alkali liquor circulating pump 5 from a hydrogen side buffer tank 9;
4) The other part of the alkali liquor after electrolysis comes out from the anode of the electrolytic cell 6 along with oxygen and enters the oxygen separator 2 for gas-liquid separation, the pressure of the oxygen separator 2 is controlled to be 1.6-3.2MPa through a fourth pressure controller 16, the oxygen is sent to the downstream, and the pressure of the hydrogen separator 1 is kept to be 0.5-1kpa higher than that of the oxygen separator 2;
5) The liquid level of the oxygen separator 2 is controlled by an oxygen side liquid level controller 12, alkali liquor is sent to an oxygen side buffer tank 10, the pressure of the oxygen side buffer tank 10 is less than 0.01Mpa (micro positive pressure), after the alkali liquor of the oxygen separator 2 is decompressed to the oxygen side buffer tank 10, gas (mostly oxygen, containing trace hydrogen) dissolved in the alkali liquor is released, the pressure of the oxygen side buffer tank 10 is controlled by a second pressure controller 14, and the released gas is emptied;
6) The alkali liquor after gas release is sent to an alkali liquor circulating pump 5 from an oxygen side buffer tank 10;
7) The alkali liquor from the hydrogen side buffer tank 9 and the oxygen side buffer tank 10 is mixed by the alkali liquor circulating pump 5, and then returns to the cathode and anode electrolysis cells of the electrolysis bath 6 through the alkali liquor circulating pump 5, the alkali liquor cooler 3 and the alkali liquor flow meter 4, and is electrolyzed again to complete a cycle.
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 invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a high hydrogen purity, high safe electrolysis water alkali lye circulation system, includes hydrogen separator, oxygen separator, alkali lye circulating pump, electrolysis trough, the liquid outlet of hydrogen separator, oxygen separator connects gradually alkali lye circulating pump, electrolysis trough inlet through the pipeline respectively, the electrolysis trough gas outlet is respectively through the air inlet of tube coupling to hydrogen separator, oxygen separator, its characterized in that: still include hydrogen side buffer tank and oxygen side buffer tank, the liquid outlet of hydrogen separator is connected to the inlet of hydrogen side buffer tank, the alkali lye circulating pump is connected to the liquid outlet of hydrogen side buffer tank, the liquid outlet of oxygen separator is connected to the inlet of oxygen side buffer tank, the alkali lye circulating pump is connected to the liquid outlet of oxygen side buffer tank, hydrogen side buffer tank has the hydrogen gas vent, oxygen side buffer tank has the oxygen gas vent.
2. The high hydrogen purity, high safety system of an electrolyzed water alkaline solution as defined in claim 1, wherein: the hydrogen side liquid level controller is arranged on a pipeline between the hydrogen separator and the hydrogen side buffer tank, and the oxygen side liquid level controller is arranged on a pipeline between the oxygen separator and the oxygen side buffer tank.
3. The high hydrogen purity, high safety system of an electrolyzed water alkaline solution as defined in claim 1, characterized in that: the hydrogen-gas separation device is characterized by further comprising a first pressure controller and a second pressure controller, wherein the first pressure controller is arranged on a pipeline where a hydrogen exhaust port of the hydrogen side buffer tank is located, and the second pressure controller is arranged on a pipeline where an oxygen exhaust port of the oxygen side buffer tank is located.
4. The high hydrogen purity, high safety system of an electrolyzed water alkaline solution as defined in claim 1, wherein: the hydrogen separator further comprises a third pressure controller and a fourth pressure controller, wherein the third pressure controller is arranged on a pipeline where the gas outlet of the hydrogen separator is located, and the fourth pressure controller is arranged on a pipeline where the gas outlet of the oxygen separator is located.
5. The high hydrogen purity, high safety system of an electrolyzed water alkaline solution as defined in claim 4, wherein: the fourth pressure controller controls the pressure of an air outlet of the oxygen separator to be 1.6-3.2Mpa, the third pressure controller controls the pressure of an air outlet of the hydrogen separator to be 1.6-3.2Mpa, and the third pressure controller controls the pressure of the air outlet of the hydrogen separator to be 0.5-1kpa higher than the pressure of the air outlet of the oxygen separator.
6. The high hydrogen purity, high safety system of an electrolyzed water alkaline solution as defined in claim 3, wherein: the internal pressure of the hydrogen side buffer tank is controlled to be less than 0.01Mpa through a first pressure controller, and the internal pressure of the oxygen side buffer tank is controlled to be less than 0.01Mpa through a second pressure controller.
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| CN202220657508.9U CN217757693U (en) | 2022-03-25 | 2022-03-25 | High-hydrogen-purity and high-safety electrolytic water alkali liquor circulating system |
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| CN202220657508.9U CN217757693U (en) | 2022-03-25 | 2022-03-25 | High-hydrogen-purity and high-safety electrolytic water alkali liquor circulating system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114717607A (en) * | 2022-03-25 | 2022-07-08 | 上海卓微氢科技有限公司 | High-hydrogen-purity and high-safety electrolytic water alkali liquor circulating system and control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114717607A (en) * | 2022-03-25 | 2022-07-08 | 上海卓微氢科技有限公司 | High-hydrogen-purity and high-safety electrolytic water alkali liquor circulating system and control method |
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