CN219689889U - Pressure self-balancing device of electrolytic water hydrogen production system and electrolytic water hydrogen production system - Google Patents
Pressure self-balancing device of electrolytic water hydrogen production system and electrolytic water hydrogen production system Download PDFInfo
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- CN219689889U CN219689889U CN202320731048.4U CN202320731048U CN219689889U CN 219689889 U CN219689889 U CN 219689889U CN 202320731048 U CN202320731048 U CN 202320731048U CN 219689889 U CN219689889 U CN 219689889U
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- 239000001257 hydrogen Substances 0.000 title claims abstract description 187
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 187
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 186
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 35
- 239000007788 liquid Substances 0.000 claims abstract description 200
- 239000001301 oxygen Substances 0.000 claims abstract description 127
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 127
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 126
- 239000000872 buffer Substances 0.000 claims abstract description 111
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 32
- 239000007789 gas Substances 0.000 claims abstract description 23
- 230000009471 action Effects 0.000 claims abstract description 20
- 238000007789 sealing Methods 0.000 claims description 64
- 238000000926 separation method Methods 0.000 claims description 27
- 150000002431 hydrogen Chemical class 0.000 claims description 15
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 12
- 229910001882 dioxygen Inorganic materials 0.000 claims description 12
- 238000010586 diagram Methods 0.000 description 25
- 230000008859 change Effects 0.000 description 12
- 230000007797 corrosion Effects 0.000 description 11
- 238000005260 corrosion Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 9
- 230000004044 response Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- 230000005465 channeling Effects 0.000 description 3
- 238000007667 floating Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002028 premature Effects 0.000 description 2
- 239000012536 storage buffer Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000012670 alkaline solution Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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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
Landscapes
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Abstract
The utility model belongs to the technical field of hydrogen production by water electrolysis, and particularly relates to a pressure self-balancing device of a hydrogen production system by water electrolysis and the hydrogen production system by water electrolysis. The pressure self-balancing device includes: the pressure self-balancing device comprises a pressure self-balancing device outer wall, a piston, a pressure balancing spring, a hydrogen gas-liquid separator and an oxygen gas-liquid separator, wherein the hydrogen gas-liquid separator is connected with an inlet pipeline; the piston is positioned in a buffer cavity surrounded by the outer wall of the pressure self-balancing device, and divides the buffer cavity into a hydrogen buffer cavity and an oxygen buffer cavity; the piston is connected with the pressure balance spring, so that the piston can move left and right under the action of gas or liquid and/or under the action of the pressure balance spring, and the volumes of the hydrogen buffer cavity and the oxygen buffer cavity are changed; the hydrogen gas-liquid separator connection inlet pipeline is connected to the hydrogen buffer chamber, and the oxygen gas-liquid separator connection inlet pipeline is connected to the oxygen buffer chamber.
Description
Technical Field
The utility model belongs to the technical field of hydrogen production by water electrolysis, and particularly relates to a pressure self-balancing device of a hydrogen production system by water electrolysis and the hydrogen production system by water electrolysis.
Background
When the water electrolysis hydrogen production equipment is in a working state, the output of hydrogen is twice that of oxygen, and the transient fluctuation of the working state often causes pressure imbalance among oxyhydrogen systems, so that the working state of the electrolytic tank is influenced. The pressure difference between the oxyhydrogen separators can lead to the deviation of the liquid level difference between the oxyhydrogen separators from a normal working state, and on the other hand, the gas between oxyhydrogen systems can be easily led to the mutual channeling, so that the safety of the device is damaged.
The present utility model has been made to solve the above-described problems.
Disclosure of Invention
The first aspect of the utility model provides a pressure self-balancing device of a water electrolysis hydrogen production system, which comprises: the outer wall of the pressure self-balancing device, the piston, the pressure balancing spring, the hydrogen gas-liquid separator 02 is connected with an inlet pipeline, and the oxygen gas-liquid separator is connected with the inlet pipeline;
the piston is positioned in a buffer cavity surrounded by the outer wall of the pressure self-balancing device, and divides the buffer cavity into a hydrogen buffer cavity and an oxygen buffer cavity;
the piston is connected with the pressure balance spring, so that the piston can move left and right under the action of gas or liquid and/or under the action of the pressure balance spring, and the volumes of the hydrogen buffer cavity and the oxygen buffer cavity are changed;
the hydrogen gas-liquid separator 02 connection inlet line is connected to the hydrogen buffer chamber, and the oxygen gas-liquid separator connection inlet line is connected to the oxygen buffer chamber.
Preferably, the hydrogen gas-liquid separator 02 is connected with the inlet pipeline and the oxygen gas-liquid separator is connected with the inlet pipeline and is arranged at an included angle with the horizontal plane.
Preferably, the pressure balance spring is positioned in the oxygen buffer cavity;
one end of the pressure balance spring is coupled to the outer wall of the pressure self-balancing device, and the other end is coupled to the piston.
Preferably, the pressure balance spring is located outside the buffer cavity, and the piston is coupled to a piston rod penetrating through the outer wall of the pressure self-balancing device;
one end of the pressure balance spring is coupled to the outer wall of the pressure self-balancing device, and the other end of the pressure balance spring is coupled to the piston rod.
Preferably, the number of the pressure balance springs is two, and the pressure balance springs are respectively arranged at two sides of the buffer cavity.
Preferably, the piston rod is annular, and a sealing element is arranged between the piston rod and the outer wall of the pressure self-balancing device.
A second aspect of the present utility model provides an electrolyzed water hydrogen production system with a pressure self-balancing device, the electrolyzed water hydrogen production system comprising: an electrolytic cell 01, an oxygen gas-liquid separator 03, a hydrogen gas-liquid separator 02, the pressure self-balancing device according to any one of the first aspect;
wherein the anode of the electrolytic tank 01 is connected to the oxygen gas-liquid separator 03 through an oxygen separation pipeline 05, and the cathode of the electrolytic tank 01 is connected to the hydrogen gas-liquid separator 02 through a hydrogen separation pipeline 04;
the pressure self-balancing device of the first aspect is coupled between the oxygen gas-liquid separator 03 and the hydrogen gas-liquid separator 02 to achieve pressure balance of the oxyhydrogen system in the whole water electrolysis hydrogen production system.
Preferably, the specific way in which the pressure self-balancing device of any one of the first aspects is coupled between the oxygen gas-liquid separator 03 and the hydrogen gas-liquid separator 02 is selected from any one of the following two:
mode one: an oxygen gas-liquid separator connecting inlet pipeline of the pressure self-balancing device is communicated with an upper gas phase space of the oxygen gas-liquid separator 03, and a hydrogen gas-liquid separator 02 connecting inlet pipeline of the pressure self-balancing device is communicated with an upper gas phase space of the hydrogen gas-liquid separator 02;
mode two: the oxygen gas-liquid separator connection inlet pipeline of the pressure self-balancing device is communicated with the oxygen separation pipeline 05, and the hydrogen gas-liquid separator 02 connection inlet pipeline of the pressure self-balancing device is communicated with the hydrogen separation pipeline 04.
Preferably, in the first mode, the bottom surface of the pressure self-balancing device is higher than the gas-liquid interface between the hydrogen gas-liquid separator 02 and the oxygen gas-liquid separator 03.
Preferably, in the second mode, the bottom surface of the pressure self-balancing device is lower than the gas-liquid interface between the hydrogen gas-liquid separator 02 and the oxygen gas-liquid separator 03.
Compared with the prior art, the utility model has the following beneficial effects:
1. the pressure self-balancing device of the utility model is realized by the movement of the spring and the piston. The utility model realizes the pressure self-balancing of the oxyhydrogen system of the water electrolysis device by arranging a pressure self-balancing device between the oxygen gas-liquid separator 03 and the hydrogen gas-liquid separator 02.
2. The spring in the pressure self-balancing device of the utility model can be arranged inside or outside the outer wall of the pressure self-balancing device. When the spring is arranged in the outer wall of the pressure self-balancing device, the sealing performance of the device is better. When the spring is arranged outside the outer wall of the pressure self-balancing device, the pressure self-balancing device belongs to dynamic sealing, but the spring can avoid premature corrosion caused by contact with electrolyte.
3. The pressure self-balancing device of the present utility model may be provided above or below the gas-liquid separation interface of the oxygen gas-liquid separator 03 and the hydrogen gas-liquid separator 02.
When the pressure self-balancing device is arranged below the gas-liquid separation interface of the oxygen gas-liquid separator 03 and the hydrogen gas-liquid separator 02, the pressure self-balancing device belongs to a low-position pressure self-balancing device. The side of the low-level pressure self-balancing device, which is close to the hydrogen gas-liquid separator 02, is provided with a hydrogen buffer cavity filled with hydrogen liquid, and the side of the low-level pressure self-balancing device, which is close to the oxygen gas-liquid separator 03, is provided with an oxygen buffer cavity filled with oxygen liquid. Such a mounting relationship is more responsive to pressure fluctuations in the electrolytic oxyhydrogen system due to the closer proximity of the low-level pressure self-balancing device to the electrolytic cell 01, and liquid filling also facilitates the sealability of the device.
When the pressure self-balancing device is arranged above the gas-liquid separation interface of the oxygen gas-liquid separator 03 and the hydrogen gas-liquid separator 02, the pressure self-balancing device belongs to a high-level pressure self-balancing device. The side of the high-order pressure self-balancing device, which is close to the hydrogen gas-liquid separator 02, is provided with a hydrogen buffer cavity filled with hydrogen, and the side, which is close to the oxygen gas-liquid separator 03, is provided with an oxygen buffer cavity filled with oxygen. Such a mounting relationship facilitates the real-time observation of the liquid level difference between the hydrogen gas-liquid separator 02 and the oxygen gas-liquid separator 03, thereby enabling a more timely response to pressure fluctuations inside the apparatus.
Drawings
Fig. 1 is a schematic structural diagram of a high-level pressure self-balancing device in embodiment 1.
Fig. 2 is a schematic diagram showing the initial state of the high-level pressure self-balancing device in embodiment 1.
FIG. 3 is a schematic diagram showing the operation of the high-pressure self-balancing device in example 1 when the hydrogen pressure of the hydrogen system increases suddenly.
FIG. 4 is a schematic diagram showing the connection between the high-level pressure self-balancing device and the water electrolysis device in example 1.
Fig. 5 is a schematic structural diagram of a low-level pressure self-balancing device in embodiment 2.
Fig. 6 is a schematic diagram showing the initial state of the low-level pressure self-balancing device of embodiment 2.
FIG. 7 is a schematic diagram showing the operation of the low-pressure self-balancing device in example 2 when the hydrogen pressure of the hydrogen system increases suddenly.
FIG. 8 is a schematic diagram showing the coupling relationship between the high-pressure self-balancing sealing device and the water electrolysis device in example 2.
Fig. 9 is a schematic structural diagram of a high-pressure self-balancing dynamic sealing device in embodiment 3.
Fig. 10 is a schematic diagram showing the initial state of the high-pressure self-balancing dynamic sealing device in embodiment 3.
FIG. 11 is a schematic diagram showing the operation of the high-pressure self-balancing dynamic seal device in example 3 when the hydrogen pressure of the hydrogen system increases suddenly.
FIG. 12 is a schematic diagram showing the connection between the high-pressure self-balancing dynamic seal device and the water electrolysis device in example 3.
Fig. 13 is a schematic structural diagram of a low-pressure self-balancing dynamic seal device in embodiment 4.
Fig. 14 is a schematic view showing the initial state structure of the low-pressure self-balancing dynamic sealing device of embodiment 4.
FIG. 15 is a schematic diagram showing the operation of the low-pressure self-balancing dynamic seal device in example 4 when the pressure of the hydrogen system increases suddenly.
FIG. 16 is a schematic illustration of the connection between the low pressure self-balancing dynamic seal device and the water electrolysis device in example 4.
List of reference numerals:
01. an electrolytic tank 02, a hydrogen gas-liquid separator 03, an oxygen gas-liquid separator 04, a hydrogen separation pipeline, a 05 and an oxygen separation pipeline.
1. The outer wall of the first high-position pressure self-balancing device, the first piston, the first pressure balancing spring, the first hydrogen gas-liquid separator and the inlet pipeline are connected, and the first oxygen gas-liquid separator and the inlet pipeline are connected.
6. The outer wall of the second low-position pressure self-balancing device, 7, a second piston, 8, a second pressure balancing spring, 9 and a second hydrogen gas-liquid separator are connected with an inlet pipeline, and 10 and a second oxygen gas-liquid separator are connected with the inlet pipeline.
11. The third pressure balance spring, 12, the third piston rod, 13, the outer wall of the third high-position pressure self-balancing device, 14, the third piston, 15, the first sealing element, 16, the fourth pressure balance spring, 17, the second sealing element, 18 and the third hydrogen gas-liquid separator are connected with an inlet pipeline, 19 and the third oxygen gas-liquid separator are connected with an inlet pipeline, 20 and the third sealing element.
21. The fourth sealing element, 22, the fourth hydrogen-gas-liquid separator are connected with an inlet pipeline, 23, a fourth piston rod, 24, a fourth piston, 25, the fifth sealing element, 26, the fourth oxygen-gas-liquid separator are connected with the inlet pipeline, 27, the sixth sealing element, 28, a fifth pressure balance spring, 29, a fourth pressure balance device outer wall, 30 and a sixth pressure balance spring.
Detailed Description
The present utility model will be described in further detail with reference to examples.
It will be appreciated by those skilled in the art that the following examples are illustrative of the present utility model and should not be construed as limiting the scope of the utility model. The specific techniques or conditions are not identified in the examples and are performed according to techniques or conditions described in the literature in this field or according to the product specifications. The materials or equipment used are conventional products available from commercial sources, not identified to the manufacturer.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Further, "connected" as used herein may include wireless connections.
In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more. The orientation or state relationship indicated by the terms "inner", "upper", "lower", etc. are orientation or state relationship based on the drawings, are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the utility model.
In the description of the present utility model, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "provided" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present utility model is understood by those of ordinary skill in the art according to the specific circumstances.
It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
A pressure self-balancing device of an electrolytic water hydrogen production system, characterized in that the pressure self-balancing device comprises: the pressure self-balancing device comprises a pressure self-balancing device outer wall, a piston, a pressure balancing spring, a hydrogen gas-liquid separator and an oxygen gas-liquid separator, wherein the hydrogen gas-liquid separator is connected with an inlet pipeline;
the piston is positioned in a buffer cavity surrounded by the outer wall of the pressure self-balancing device, and divides the buffer cavity into a hydrogen buffer cavity and an oxygen buffer cavity;
the piston is connected with the pressure balance spring, so that the piston can move left and right under the action of gas or liquid and/or under the action of the pressure balance spring, and the volumes of the hydrogen buffer cavity and the oxygen buffer cavity are changed;
the hydrogen gas-liquid separator connection inlet pipeline is connected to the hydrogen buffer chamber, and the oxygen gas-liquid separator connection inlet pipeline is connected to the oxygen buffer chamber.
An electrolyzed water hydrogen production system with a pressure self-balancing device, the electrolyzed water hydrogen production system comprising: an electrolytic cell 01, an oxygen gas-liquid separator 03, a hydrogen gas-liquid separator 02, a pressure self-balancing device according to any one of the above;
wherein the anode of the electrolytic tank 01 is connected to the oxygen gas-liquid separator 03 through an oxygen separation pipeline 05, and the cathode of the electrolytic tank 01 is connected to the hydrogen gas-liquid separator 02 through a hydrogen separation pipeline 04;
the pressure self-balancing device is connected between the oxygen-gas-liquid separator 03 and the hydrogen-gas-liquid separator 02 to realize the pressure balance of the oxyhydrogen system in the whole water electrolysis hydrogen production system.
Specific examples of the above-described pressure self-balancing device and the electrolytic water hydrogen production system with the pressure self-balancing device are as follows.
Example 1
A pressure self-balancing device of an electrolytic water hydrogen production system comprises the following parts: the first high-order pressure self-balancing device outer wall 1, first piston 2, first pressure balance spring 3, first hydrogen gas-liquid separator connect the inlet pipeline 4, first oxygen gas-liquid separator connect the inlet pipeline 5.
The first piston 2 is positioned in a buffer cavity surrounded by the outer wall 1 of the first high-level pressure self-balancing device, and divides the buffer cavity into a hydrogen buffer cavity and an oxygen buffer cavity;
the first piston 2 is coupled with the first pressure balance spring 3 so that the first piston 2 can move left and right under the action of gas or liquid and under the action of the first pressure balance spring 3 to change the volumes of the hydrogen buffer chamber and the oxygen buffer chamber;
the first hydrogen gas-liquid separator connection inlet line 4 is connected to the hydrogen buffer chamber and the first oxygen gas-liquid separator connection inlet line 5 is connected to the oxygen buffer chamber.
The first pressure balance spring 3 is positioned in the oxygen buffer cavity;
one end of the first pressure balance spring 3 is coupled to the outer wall of the pressure self-balancing device, and the other end is coupled to the piston.
In the electrolytic water hydrogen production system with the pressure self-balancing device, the high-level pressure self-balancing device is respectively communicated with the upper gas-phase spaces of the hydrogen gas-liquid separator 02 and the oxygen gas-liquid separator 03 through the first hydrogen gas-liquid separator connecting inlet pipeline 4 and the first oxygen gas-liquid separator connecting inlet pipeline 5, so that the pressure on both sides of the first piston 2 is balanced with the pressure of the hydrogen gas separator.
Preferably, the material of the outer wall 1 of the first high-level pressure self-balancing device is the same as that of the electrolytic tank 01, and can be nickel-plated steel or the like, so as to achieve the effect of resisting alkali liquid corrosion.
Preferably, a sealing device is arranged between the first piston 2 and the outer wall 1 of the first high-position pressure self-balancing device, so that the gas on two sides of the first piston 2 is prevented from channeling to influence the normal operation of the device.
Preferably, the material of which the first pressure balance spring 3 is made should have a strong resistance to corrosion in alkaline environments. At the same time, the spring is in a relaxed state in a pressure equilibrium state (i.e., initial state), thereby avoiding premature stress corrosion in frequent deformation states and compromising life.
Preferably, the first hydrogen gas-liquid separator connection inlet line 4 and the first oxygen gas-liquid separator connection inlet line 5 are arranged obliquely downwards relative to the horizontal plane, so that their position close to the hydrogen gas-liquid separator 02 or the oxygen gas-liquid separator 03 is lower and their position close to the outer wall 1 of the first high-pressure self-balancing device is higher, so that when condensed liquid is present in the buffer chamber of the high-pressure self-balancing device, liquid can flow back into the hydrogen gas-liquid separator 02 or the oxygen gas-liquid separator 03 along the first hydrogen gas-liquid separator connection inlet line 4 or the first oxygen gas-liquid separator connection inlet line 5.
Fig. 1 is a schematic structural diagram of a high-level pressure self-balancing device in embodiment 1. Fig. 2 is a schematic diagram showing the initial state of the high-level pressure self-balancing device in embodiment 1. When the device is in normal operation, the pressure balance between the hydrogen gas separator 02 and the oxygen gas separator 03 is realized, and at the moment, the first piston 2 and the first pressure balance spring 4 in the high-position pressure self-balancing device are in initial positions, namely, the first piston 2 is abutted against the outer wall surface of the device on one side of the hydrogen buffer cavity. The first pressure balance spring 3 is in a natural extended state.
Preferably, when the electrolysis device is arranged on an offshore floating platform, a certain volume is left on one side of the first piston 2 close to the hydrogen gas-liquid separator 02, namely, a certain distance exists between the first piston 2 and the outer wall surface of the device on one side of the hydrogen buffer cavity. Such an arrangement counteracts pressure fluctuations that occur between the hydrogen and oxygen systems of the device.
FIG. 3 is a schematic diagram showing the operation of the high-level pressure self-balancing device in example 1 when the hydrogen pressure is suddenly increased. When the working state of the electrolytic tank 01 fluctuates instantaneously, the hydrogen yield increases suddenly, the pressure of the hydrogen buffer cavity of the high-level pressure self-balancing device increases suddenly, and at the moment, the stress on the two sides of the first piston 2 is unbalanced, so that the first piston is pushed to the side close to the oxygen gas separator 03 by the hydrogen. The first pressure balance spring 4 is also compressed by the movement of the first piston 2, and generates a force opposite to the displacement direction of the first piston 2. Finally, the movement is stopped when the stress on the two sides of the first piston 2 reaches balance.
When the device returns to the normal running operation state, the pressure of the hydrogen buffer cavity is reduced, and the first piston 2 returns to the initial state under the action of the first pressure balance spring 4.
In the high-level pressure self-balancing device, by moving the first piston 2, the pressure difference between the oxyhydrogen separators is released by the volume change of the high-level pressure self-balancing device part communicated with the first piston, so that the quick response to the pressure change of the oxyhydrogen system is achieved, and the pressure difference of the oxyhydrogen system of the water electrolysis device can be regulated.
The hydrogen system of the water electrolysis device generally refers to a cathode part of the electrolytic tank 01, a hydrogen separation pipeline 04 and a hydrogen gas-liquid separator 02.
The oxygen system of the water electrolysis device generally refers to the anode part of the electrolytic tank 01, the oxygen separation pipeline 05 and the oxygen gas-liquid separator 03.
FIG. 4 is a schematic diagram showing the connection between the high-level pressure self-balancing device and the water electrolysis device in example 1. The high-pressure self-balancing device is respectively communicated with the upper gas-phase spaces of the hydrogen gas-liquid separator 02 and the oxygen gas-liquid separator 03 through a first hydrogen gas-liquid separator connecting inlet pipeline 4 and a first oxygen gas-liquid separator connecting inlet pipeline 5. The bottom surface of the pressure self-balancing device should be higher than the gas-liquid interface of the hydrogen gas-liquid separator 02 and the oxygen gas-liquid separator 03. At this time, the side of the high-level pressure self-balancing device close to the hydrogen gas-liquid separator 02 is a hydrogen buffer cavity filled with hydrogen, and the side of the high-level pressure self-balancing device close to the oxygen gas-liquid separator 03 is an oxygen buffer cavity filled with oxygen. Such a mounting relationship facilitates the real-time observation of the liquid level difference between the hydrogen gas-liquid separator 02 and the oxygen gas-liquid separator 03, thereby enabling a more timely response to pressure fluctuations inside the apparatus.
Preferably, the total volume of the high-level pressure self-balancing device (i.e. the volume of the buffer chamber) is equal to the gas-phase space above the hydrogen-liquid separator 02, so as to ensure that the device has sufficient pressure buffer capacity.
Example 2
A pressure self-balancing device of an electrolytic water hydrogen production system comprises the following parts:
the second low-level pressure self-balancing device outer wall 6, a second piston 7, a second pressure balancing spring 8, and a second hydrogen-gas separator connected with an inlet pipeline 9 and a second oxygen-gas separator connected with an inlet pipeline 10.
The second piston 7 is located in a buffer cavity surrounded by the outer wall 6 of the second low-level pressure self-balancing device, and divides the buffer cavity into a hydrogen buffer cavity and an oxygen buffer cavity;
the second piston 7 is coupled with the second pressure balance spring 8 so that the second piston 7 can move left and right under the action of gas or liquid and under the action of the second pressure balance spring 8 to change the volumes of the hydrogen buffer chamber and the oxygen buffer chamber;
the second hydrogen gas-liquid separator connection inlet line 9 is connected to the hydrogen buffer chamber and the second oxygen gas-liquid separator connection inlet line 10 is connected to the oxygen buffer chamber.
The second pressure balance spring 8 is positioned in the oxygen buffer cavity;
the second pressure balance spring 8 has one end coupled to the pressure self-balancing device outer wall and the other end coupled to the piston.
In the electrolytic water hydrogen production system with the pressure self-balancing device, the anode of the electrolytic tank 01 is connected to the oxygen-liquid separator 03 through the oxygen separation pipe 05, and the cathode of the electrolytic tank 01 is connected to the hydrogen-liquid separator 02 through the hydrogen separation pipe 04. The low-level pressure self-balancing device is respectively communicated with the hydrogen separation pipeline 04 and the oxygen separation pipeline 05 through a second hydrogen gas-liquid separator connecting inlet pipeline 9 and a second oxygen gas-liquid separator connecting inlet pipeline 10, so that the pressure at two sides of the piston is balanced with the pressure of the hydrogen and oxygen separator. The low-level pressure self-balancing device is internally provided with a second piston 7, and the second piston is positioned on the side, close to the hydrogen gas-liquid separator 02, of the low-level pressure self-balancing device.
Preferably, the outer wall 6 of the second low-pressure self-balancing device is made of the same material as the electrolytic tank 01, and can be nickel-plated steel or the like so as to achieve the effect of resisting alkali liquid corrosion.
Preferably, a sealing device is arranged between the second piston 7 and the outer wall 6 of the second low-position pressure self-balancing device, so that the gas at two sides of the piston is prevented from channeling each other to influence the normal operation of the device.
Preferably, the material of construction of the second pressure balance spring 8 should have a strong resistance to corrosion in alkaline environments. At the same time, the spring is in a relaxed state in a pressure balance state (i.e. initial state), so that the damage to the service life caused by early stress corrosion in a frequently deformed state is avoided.
Preferably, the second hydrogen-gas separator connection inlet line 9 and the second oxygen-gas separator connection inlet line 10 are disposed obliquely upward with respect to the horizontal plane such that the position closer to the separator is higher and the position closer to the low-pressure self-balancing device is lower, so that when gas is present inside the low-pressure self-balancing device, the gas can flow back into the hydrogen-gas separator 02 or the oxygen-gas separator 03 along the communicating pipe.
Fig. 5 is a schematic structural diagram of a low-level pressure self-balancing device in embodiment 2. Fig. 6 is a schematic diagram showing the initial state of the low-level pressure self-balancing device of embodiment 2. When the device is in normal operation, the pressure balance between the hydrogen gas separator 02 and the oxygen gas separator 03 is realized, and at the moment, the second piston 7 and the second pressure balance spring 8 in the low-position pressure self-balancing device are in initial positions, namely, the first piston 2 is abutted against the outer wall surface of the device on one side of the hydrogen buffer cavity. The second pressure balance spring 8 is in a natural extended state.
Preferably, when the electrolysis device is arranged on the offshore floating platform, a certain volume is reserved on one side of the second piston 7 close to the hydrogen gas-liquid separator 02, namely, a certain distance exists between the first piston 2 and the outer wall surface of the device on one side of the hydrogen buffer cavity. Such an arrangement counteracts pressure fluctuations that occur between the oxyhydrogen systems due to shaking of the device itself.
FIG. 8 is a schematic diagram showing the coupling relationship between the high-pressure self-balancing sealing device and the water electrolysis device in example 2. The low-pressure self-balancing device is respectively communicated with the hydrogen separation pipeline 04 and the oxygen separation pipeline 05 through a second hydrogen gas-liquid separator connecting inlet pipeline 9 and a second oxygen gas-liquid separator connecting inlet pipeline 10.
The top surface of the low-level pressure self-balancing device should be lower than the gas-liquid interface of the hydrogen gas-liquid separator 02 and the oxygen gas-liquid separator 03. At this time, the hydrogen buffer cavity inside the low-pressure self-balancing device is filled with hydrogen liquid (catholyte and hydrogen), and the oxygen buffer cavity is filled with oxygen liquid (anolyte and oxygen).
Such a mounting relationship is more responsive to pressure fluctuations in the electrolytic oxyhydrogen system due to the closer proximity of the low-level pressure self-balancing device to the electrolytic cell 01, and liquid filling also facilitates the sealability of the device.
The working behavior of the low-level pressure self-balancing device is shown in fig. 7, when the working state of the electrolytic tank 01 fluctuates instantaneously, the pressure at one side of the hydrogen buffer cavity of the low-level pressure self-balancing device rises suddenly, and at the moment, the two sides of the second piston 7 are stressed unevenly so as to be pushed to one side close to the oxygen buffer cavity. The second pressure balance spring 8 is also compressed by the movement of the second piston 7 and generates a force opposite to the displacement direction of the piston 4. Finally, the movement is stopped when the stress on the two sides of the second piston 7 reaches the balance. When the device returns to the normal running operation state, the pressure of the hydrogen buffer cavity is reduced, and the second piston 7 returns to the initial state under the action of the second pressure balance spring 8.
By the movement of the second piston 7, the pressure difference between the oxyhydrogen separators is released by the volume change of the low-level pressure self-balancing device part communicated with the second piston, so that the quick response to the pressure change of the oxyhydrogen system is achieved and the pressure difference of the oxyhydrogen system of the water electrolysis device can be regulated.
Example 3
A high-position pressure self-balancing dynamic sealing device comprises the following parts:
the device comprises a third pressure balance spring 11, a third piston rod 12, a third high-position pressure self-balancing device outer wall 13, a third piston 14, a first sealing element 15, a fourth pressure balance spring 16, a second sealing element 17, a third hydrogen gas-liquid separator connecting inlet pipeline 18, a third oxygen gas-liquid separator connecting inlet pipeline 19 and a third sealing element 20.
The third piston 14 is located in a buffer cavity surrounded by the outer wall of the pressure self-balancing device, and divides the buffer cavity into a hydrogen buffer cavity and an oxygen buffer cavity;
the third piston 14 is coupled with the third pressure balance spring 11 and the fourth pressure balance spring 16, so that the third piston 14 can move left and right under the action of gas or liquid and/or under the action of the third pressure balance spring 11 and the fourth pressure balance spring 16 to change the volumes of the hydrogen buffer cavity and the oxygen buffer cavity;
the third hydrogen gas-liquid separator connection inlet line 18 is connected to the hydrogen buffer chamber and the third oxygen gas-liquid separator connection inlet line 19 is connected to the oxygen buffer chamber.
The third pressure balance spring 11 and the fourth pressure balance spring 16 are respectively arranged at two sides of the buffer cavity and are positioned outside the buffer cavity. The third piston 14 is coupled to a third piston rod 12 extending through the outer wall of the pressure self-balancing device. The third pressure balance spring 11 has one end coupled to the pressure self-balancing device outer wall and the other end coupled to the third piston rod 12. The fourth pressure balance spring 16 has one end coupled to the pressure self-balancing device outer wall and the other end coupled to the third piston rod 12.
The third piston rod 12 is annular, and a sealing element is arranged between the third piston rod 12 and the outer wall of the pressure self-balancing device.
In the electrolytic water hydrogen production system with the pressure self-balancing device, the high-level pressure self-balancing dynamic sealing device is respectively communicated with the upper gas phase spaces of the hydrogen gas-liquid separator 02 and the oxygen gas-liquid separator 03 through the third hydrogen gas-liquid separator connecting inlet pipeline 18 and the third oxygen gas-liquid separator connecting inlet pipeline 19, so that the pressure at two sides of the piston is balanced with the pressure of the hydrogen gas separator and the oxygen gas separator. The third piston 14 is arranged in the high-position pressure self-balancing dynamic sealing device, and the position of the third piston is located in the center of the high-position pressure self-balancing dynamic sealing device. A first seal 15 between the piston and the piston rod is arranged between the third piston 14 and the third piston rod 12. A second sealing element 17 and a third sealing element 20 are arranged between the third piston rod 12 and the third high-pressure self-balancing device outer wall 13. The third piston rod 12 extends out of the sealing device and is connected with the outer wall 13 of the third high-position pressure self-balancing device through a third pressure balancing spring 11 and a fourth pressure balancing spring 16. The third piston 14 is free to move with the third piston rod 12 and the rest of the device is fixed.
The advantages of this embodiment are: the third pressure balance spring 11 and the fourth pressure balance spring 16 which can generate acting force opposite to the pressure difference are arranged outside the outer wall 13 of the third high-position pressure self-balancing device, so that the springs are prevented from being in direct contact with electrolytic materials, and spring failure caused by pressure corrosion is avoided.
Preferably, the outer wall 13 of the third high-pressure self-balancing dynamic sealing device is made of the same material as the electrolytic tank 01, and can be nickel-plated steel or the like so as to achieve the effect of resisting alkali liquid corrosion.
Preferably, an O-type sealing device is disposed between the third piston 14 and the outer wall 13 of the third high-pressure self-balancing dynamic sealing device, and the sealing element is elastically deformed to generate contact pressure on the sealing contact surface, so as to achieve a sealing effect, and ensure that the gas at two sides of the piston does not cross each other to affect the normal operation of the device.
Preferably, a sealing device is arranged between the third piston rod 12 and the outer wall 13 of the high-pressure self-balancing dynamic sealing device, and the sealing device can enable the third piston rod 12 to move smoothly without leakage of substances in the device, so that the dynamic sealing effect is achieved.
Preferably, the third hydrogen-gas-liquid separator connection inlet line 18 and the third oxygen-gas-liquid separator connection inlet line 19 are disposed obliquely downward with respect to the horizontal plane, so that the position close to the oxyhydrogen separator is lower and the position close to the high-pressure self-balancing dynamic seal device outer wall 13 is higher, so that when condensed liquid exists in the buffer chamber, the liquid can flow back into the hydrogen-gas-liquid separator 02 or the oxygen-gas-liquid separator 03 along the third hydrogen-gas-liquid separator connection inlet line 18 or the third oxygen-gas-liquid separator connection inlet line 19.
Fig. 9 is a schematic structural diagram of a high-pressure self-balancing dynamic sealing device in embodiment 3. Fig. 10 is a schematic diagram showing the initial state of the high-pressure self-balancing dynamic sealing device in embodiment 3. When the device is in normal operation, the pressure balance between the hydrogen gas separator 02 and the oxygen gas separator 03 is achieved, and the third pressure balance spring 11 and the fourth pressure balance spring 16 are at initial positions and are in natural extension states. The third piston 14 abuts against the outer wall surface of the device on the side abutting against the hydrogen buffer chamber.
Preferably, when the electrolysis device is arranged on an offshore floating platform, a certain volume is left on the side close to the hydrogen gas-liquid separator 02 of the third piston 14, that is, a certain distance exists between the third piston 14 and the outer wall surface of the device on the side of the hydrogen buffer cavity. Such an arrangement counteracts pressure fluctuations that occur between the hydrogen and oxygen systems of the device.
FIG. 12 is a schematic diagram showing the connection between the high-pressure self-balancing dynamic seal device and the water electrolysis device in example 3. The high-pressure self-balancing dynamic sealing device is communicated with the upper gas-phase space of the hydrogen gas-liquid separator 02 and the oxygen gas-liquid separator 03 through third hydrogen gas-liquid separator connecting inlet pipelines 18 and 19 and third oxygen gas-liquid separator connecting inlet pipeline 19, and the bottom surface of the high-pressure self-balancing dynamic sealing device is higher than the gas-liquid interface of the oxyhydrogen separator. At the moment, the hydrogen buffer cavity in the high-pressure self-balancing dynamic sealing device is filled with hydrogen, and the oxygen buffer cavity is filled with oxygen. Such a mounting relationship facilitates the real-time observation of the liquid level difference between the hydrogen gas-liquid separator 02 and the oxygen gas-liquid separator 03, thereby enabling a more timely response to pressure fluctuations inside the apparatus.
Preferably, the total volume of the buffer cavity of the high-level pressure self-balancing dynamic sealing device is equal to the gas phase space at the upper part of the hydrogen gas-liquid separator 02, so as to ensure that the device has enough pressure buffer capacity.
The working behavior of the high-level pressure self-balancing dynamic sealing device is shown in fig. 11, when the working state of the electrolytic tank 01 fluctuates instantaneously, the pressure at one side of the high-level pressure self-balancing dynamic sealing hydrogen storage buffer cavity suddenly rises, and at the moment, the two sides of the third piston 14 are forced to be unbalanced and are pushed to the side close to the oxygen storage buffer cavity. The third pressure balance spring 11 generates a tensile deformation due to the movement of the piston, and the fourth pressure balance spring 16 generates a compression deformation due to the movement of the piston. The third pressure balance spring 11 and the fourth pressure balance spring 16 generate forces in opposite directions to the displacement direction of the third piston 14. Eventually, the third piston 14 stops moving when the forces on both sides are balanced. When the device returns to the normal operation state, the pressure of the hydrogen buffer cavity is reduced, and the third piston 14 returns to the initial state under the action of the third pressure balance spring 11 and the fourth pressure balance spring 16.
By the movement of the third piston 14, the pressure difference between the oxyhydrogen separators is released by the volume change of the high-level pressure self-balancing dynamic sealing device part communicated with the third piston, so that the quick response to the pressure change of the oxyhydrogen system is achieved and the pressure difference of the oxyhydrogen system of the water electrolysis device can be regulated.
Example 4
A low-position pressure self-balancing dynamic sealing device comprises the following parts:
a fifth pressure balance spring 28, a sixth pressure balance spring 30, a fourth piston rod 23, a fourth pressure balance device outer wall 29, a fourth piston 24, a fourth seal 21, a fifth seal 25, a sixth seal 27, a fourth hydrogen gas liquid separator connected to the inlet line 22, and a fourth oxygen gas liquid separator connected to the inlet line 26.
The fourth piston 24 is located in a buffer cavity surrounded by the outer wall 29 of the fourth pressure balancing device, and divides the buffer cavity into a hydrogen buffer cavity and an oxygen buffer cavity;
the fourth piston 24 is coupled with a fifth pressure balance spring 28 and a sixth pressure balance spring 30, so that the fourth piston 24 can move left and right under the action of gas or liquid and/or under the action of the fifth pressure balance spring 28 and the sixth pressure balance spring 30 to change the volumes of the hydrogen buffer chamber and the oxygen buffer chamber;
the fourth hydrogen-gas-liquid separator connection inlet line 22 is connected to the hydrogen buffer chamber and the fourth oxygen-gas-liquid separator connection inlet line 26 is connected to the oxygen buffer chamber.
The fifth pressure balance spring 28 and the sixth pressure balance spring 30 are respectively disposed at two sides of the buffer cavity and are located outside the buffer cavity. The fourth piston 24 is coupled to a fourth piston rod 23 extending through the outer wall of the pressure self-balancing device. The fifth pressure balance spring 28 is coupled at one end to the fourth pressure balance device outer wall 29 and at the other end to the third piston rod 12. The sixth pressure balance spring 30 is coupled at one end to the fourth pressure balance device outer wall 29 and at the other end to the fourth piston rod 23.
The fourth piston rod 23 is annular, and a fourth sealing member 21 and a sixth sealing member 27 are disposed between the fourth piston rod 23 and the outer wall 29 of the fourth pressure balancing device. The sealing member can enable the fourth piston rod 23 to move smoothly and the substances in the device cannot leak, so that the dynamic sealing effect is achieved.
In the electrolytic water hydrogen production system with the pressure self-balancing device, the low-level pressure balance dynamic sealing device is respectively communicated with the hydrogen separation pipeline 04 and the oxygen separation pipeline 05 through the fourth hydrogen-gas-liquid separator connecting inlet pipeline 22 and the fourth oxygen-gas-liquid separator connecting inlet pipeline 26, so that the pressure at two sides of the piston is balanced with the pressure of the hydrogen-oxygen separator. The fourth piston rod 23 extends beyond the fourth pressure compensation device outer wall 29 and is connected to the fourth pressure compensation device outer wall 29 via a fifth pressure compensation spring 28 and a sixth pressure compensation spring 30. The fourth piston 24 and the fourth piston rod 23 are free to move while the rest of the device is fixed.
The advantages of this embodiment are: the spring capable of generating a force opposite to the pressure difference is arranged outside the outer wall 29 of the fourth pressure balancing device, so that the spring is prevented from being in direct contact with the electrolytic material, and spring failure caused by pressure corrosion is avoided.
Preferably, the outer wall 29 of the fourth pressure balancing device is made of the same material as the electrolytic tank 01, and may be nickel-plated steel or the like, so as to achieve the effect of resisting corrosion by alkaline solution.
Preferably, a fifth sealing member 25 is disposed between the fourth piston 24 and the outer wall 29 of the fourth pressure balancing device, so as to ensure that the gas at two sides of the piston does not cross each other to affect the normal operation of the device.
Preferably, the fourth and fourth gas-liquid separator connection inlet lines 22 and 26 are disposed obliquely upward with respect to the horizontal plane so that the position near the separator is higher and the position near the low-pressure self-balancing dynamic seal device is lower, thereby allowing gas to flow back into the oxyhydrogen separator along the communicating pipe when gas exists inside the buffer chamber.
Fig. 13 is a schematic structural diagram of a low-pressure self-balancing dynamic seal device in embodiment 4. Fig. 14 is a schematic view showing the initial state structure of the low-pressure self-balancing dynamic sealing device of embodiment 4. The initial state of the low-position pressure self-balancing dynamic sealing device is shown in fig. 14. When the device is in normal operation, the pressure between the hydrogen gas separator 02 and the oxygen gas separator 03 is balanced, and at the moment, the piston and the spring in the low-position pressure self-balancing dynamic sealing device are in initial positions. The fourth piston 24 abuts against the device outer wall surface on the hydrogen buffer chamber side. The fifth and sixth pressure balance springs 28 and 30 are in a natural extended state.
FIG. 16 is a schematic illustration of the connection between the low pressure self-balancing dynamic seal device and the water electrolysis device in example 4. The pressure self-balancing dynamic sealing device is communicated with the hydrogen separation pipeline 04 and the oxygen separation pipeline 05 through a fourth hydrogen gas-liquid separator connecting inlet pipeline 22 and a fourth oxygen gas-liquid separator connecting inlet pipeline 26 respectively, and the top surface of the low-level pressure self-balancing dynamic sealing device is lower than the gas-liquid interface of the hydrogen gas-liquid separator. At the moment, a hydrogen buffer cavity in the low-pressure self-balancing dynamic sealing device is filled with hydrogen liquid (catholyte and hydrogen) and an oxygen buffer cavity is filled with oxygen liquid (anolyte and oxygen). The pressure self-balancing dynamic sealing device is closer to the electrolytic tank 01, so that the response to the pressure fluctuation of the electrolytic oxyhydrogen system is more sensitive, and the liquid filling is beneficial to the tightness of the device.
The working behavior of the low-pressure self-balancing dynamic sealing device is shown in fig. 15. When the working state of the electrolytic tank 01 fluctuates instantaneously, the pressure at one side of the hydrogen buffer cavity of the low-level pressure self-balancing dynamic sealing device rises suddenly, and at the moment, the stress at two sides of the fourth piston 24 is unbalanced so as to be pushed to one side close to the oxygen buffer cavity. The fifth pressure balance spring 28 is deformed in tension by the piston movement. The sixth pressure balance spring 30 piston moves to generate compression set. The fifth and sixth pressure balance springs 28 and 30 generate forces in opposite directions to the displacement of the fourth piston 24. Eventually, the third piston 14 stops moving when the forces on both sides are balanced. When the device returns to the normal operation state, the pressure of the hydrogen buffer cavity is reduced, and the fourth piston 24 returns to the initial state under the action of the fifth pressure balance spring 28 and the sixth pressure balance spring 30.
By the movement of the fourth piston 24, the pressure difference between the oxyhydrogen separators is released by the volume change of the low-level pressure self-balancing dynamic sealing device part communicated with the pressure difference, so that the quick response to the pressure change of the oxyhydrogen system is achieved and the pressure difference of the oxyhydrogen system of the water electrolysis device can be regulated.
Claims (10)
1. A pressure self-balancing device of an electrolytic water hydrogen production system, characterized in that the pressure self-balancing device comprises: the pressure self-balancing device comprises a pressure self-balancing device outer wall, a piston, a pressure balancing spring, a hydrogen gas-liquid separator and an oxygen gas-liquid separator, wherein the hydrogen gas-liquid separator is connected with an inlet pipeline;
the piston is positioned in a buffer cavity surrounded by the outer wall of the pressure self-balancing device, and divides the buffer cavity into a hydrogen buffer cavity and an oxygen buffer cavity;
the piston is connected with the pressure balance spring, so that the piston can move left and right under the action of gas or liquid and/or under the action of the pressure balance spring, and the volumes of the hydrogen buffer cavity and the oxygen buffer cavity are changed;
the hydrogen gas-liquid separator connection inlet pipeline is connected to the hydrogen buffer chamber, and the oxygen gas-liquid separator connection inlet pipeline is connected to the oxygen buffer chamber.
2. The pressure self-balancing device of the water electrolysis hydrogen production system according to claim 1, wherein the hydrogen gas-liquid separator connection inlet pipeline and the oxygen gas-liquid separator connection inlet pipeline are arranged at an included angle with the horizontal plane.
3. The apparatus of claim 1, wherein the pressure balancing spring is located in the oxygen buffer chamber;
one end of the pressure balance spring is coupled to the outer wall of the pressure self-balancing device, and the other end is coupled to the piston.
4. The apparatus of claim 1, wherein the pressure balance spring is located outside the buffer chamber and the piston is coupled to a piston rod extending through an outer wall of the apparatus;
one end of the pressure balance spring is coupled to the outer wall of the pressure self-balancing device, and the other end of the pressure balance spring is coupled to the piston rod.
5. The pressure self-balancing device of the water electrolysis hydrogen production system according to claim 4, wherein the number of the pressure balancing springs is two, and the pressure balancing springs are respectively arranged at two sides of the buffer cavity.
6. The pressure self-balancing device of the water electrolysis hydrogen production system according to claim 4, wherein the piston rod is annular, and a sealing element is arranged between the piston rod and the outer wall of the pressure self-balancing device.
7. An electrolyzed water hydrogen production system with a pressure self-balancing device, the electrolyzed water hydrogen production system comprising: an electrolysis cell (01), an oxygen gas liquid separator (03), a hydrogen gas liquid separator (02), a pressure self-balancing device according to any one of claims 1 to 2;
wherein the anode of the electrolytic tank (01) is connected to the oxygen gas-liquid separator (03) through an oxygen separation pipeline (05), and the cathode of the electrolytic tank (01) is connected to the hydrogen gas-liquid separator (02) through a hydrogen separation pipeline (04);
the pressure self-balancing device of any one of claims 1-2 is coupled between the oxygen gas-liquid separator (03) and the hydrogen gas-liquid separator (02) to achieve pressure balance of the oxyhydrogen system in the overall electrolyzed water hydrogen production system.
8. The electrolyzed water hydrogen system with pressure self balancing apparatus according to claim 7, wherein the specific manner in which the pressure self balancing apparatus according to any one of claims 1-2 is coupled between the oxygen gas liquid separator (03) and the hydrogen gas liquid separator (02) is selected from any one of the following two:
mode one: the oxygen gas-liquid separator connecting inlet pipeline of the pressure self-balancing device is communicated with the upper gas phase space of the oxygen gas-liquid separator (03), and the hydrogen gas separator (02) connecting inlet pipeline of the pressure self-balancing device is communicated with the upper gas phase space of the hydrogen gas separator (02);
mode two: the oxygen-gas-liquid separator connecting inlet pipeline of the pressure self-balancing device is communicated with the oxygen separation pipeline (05), and the hydrogen-gas-liquid separator (02) connecting inlet pipeline of the pressure self-balancing device is communicated with the hydrogen separation pipeline (04).
9. The electrolytic water fed hydrogen production system with pressure self-balancing means as recited in claim 8, wherein in the first mode, the bottom surface of the pressure self-balancing means is higher than the gas-liquid interface of the hydrogen gas-liquid separator (02) and the oxygen gas-liquid separator (03).
10. The electrolytic water fed hydrogen production system with pressure self-balancing means as claimed in claim 8, wherein in the second mode, the bottom surface of the pressure self-balancing means is lower than the gas-liquid interface of the hydrogen gas-liquid separator (02) and the oxygen gas-liquid separator (03).
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