PEM electrolytic bath gas heat recycling system based on phase change material

Abstract

The utility model relates to the technical field of electrolytic bath heat recovery, in particular to a PEM electrolytic bath gas heat recycling system based on a phase change material, which comprises a PEM electrolytic bath, a first outlet and a second outlet are respectively arranged at the anode and the cathode of the PEM electrolytic bath, the first outlet is communicated with an oxygen end gas-liquid condensation tank, and the second outlet is communicated with an oxygen end gas-liquid condensation tank. The second outlet is communicated with a hydrogen end gas-liquid condensation tank; the other end of the oxygen end gas-liquid condensation tank and the other end of the hydrogen end gas-liquid condensation tank are respectively communicated with a liquid storage tank; the liquid storage tank is communicated with the PEM electrolytic bath through a peristaltic pump to form a loop; wherein the outer side of at least one of the liquid storage tank, the oxygen end gas-liquid condensation tank and the hydrogen end gas-liquid condensation tank is sleeved with a phase change material storage tank; the PCM phase change material is used for efficiently storing and releasing heat, gas generated by the electrolytic bath is rapidly condensed to obtain purified gas, and the heat is applied to preheating of electrolyte in the liquid storage tank.

Description

Technical Field

[0001] The utility model relates to the technical field of electrolytic cell heat recovery, in particular to a PEM electrolytic cell gas heat recovery and utilization system based on phase change materials. Background Art

[0002] With the continuous growth of global energy demand and increasingly severe environmental problems, the search for clean and efficient energy conversion and storage technologies has become a hot topic of research worldwide. Hydrogen, as a clean energy source, produces only water during combustion, without emitting harmful gases, offering significant environmental advantages. Proton exchange membrane (PEM) electrolyzers, due to their high efficiency, fast startup, and low energy consumption, have become a key research focus for hydrogen production technologies.

[0003] During operation, PEM electrolyzers typically achieve an actual system efficiency of around 70-85%. This means that 15-30% of the input electrical energy is "consumed" or "lost" as heat, rather than being fully converted into the required hydrogen output. Failure to effectively recover and utilize this waste heat not only compromises system energy efficiency but also increases operating costs. Traditional waste heat recovery methods are often inefficient and require additional capacity, making them difficult to meet current energy conservation and consumption reduction requirements.

[0004] Therefore, how to provide an electrolytic cell system that can improve the gas heat recovery rate is a technical problem that urgently needs to be solved in this field. Utility Model Content

[0005] In order to solve the technical problems mentioned in the background technology, the utility model provides a PEM electrolyzer gas heat recovery and utilization system based on phase change material to solve the problem of high waste heat loss rate of the existing PEM electrolyzer system.

[0006] In the first aspect, the utility model provides a PEM electrolyzer gas heat recovery and utilization system based on phase change material, comprising: a PEM electrolyzer, wherein the anode and cathode of the PEM electrolyzer are respectively provided with a first outlet and a second outlet, the first outlet is connected to the oxygen end gas-liquid condensation tank, and the second outlet is connected to the hydrogen end gas-liquid condensation tank; the other ends of the oxygen end gas-liquid condensation tank and the hydrogen end gas-liquid condensation tank are respectively connected to liquid storage tanks, and the liquid storage tank forms a loop by being connected to the PEM electrolyzer by a peristaltic pump; wherein a phase change material storage tank is provided on the outside of at least one of the liquid storage tank, the oxygen end gas-liquid condensation tank and the hydrogen end gas-liquid condensation tank.

[0007] Furthermore, the PEM electrolyzer is also connected to a thermocouple.

[0008] Furthermore, the temperature of the PEM electrolyzer is 50-80°C.

[0009] Furthermore, the first outlet is connected to the oxygen end gas-liquid condensation tank through a stainless steel gas pipe; the second outlet is connected to the hydrogen end gas-liquid condensation tank through a stainless steel gas pipe.

[0010] Furthermore, the phase change material in the phase change material storage tank includes any one or more combinations of PEG-800, CaCl2·6H2O, Na2SO4·10H2O and Na2CO3·10H2O.

[0011] Furthermore, the phase change material storage tank absorbs heat when it is sleeved on the outside of the oxygen end gas-liquid condensation tank and the hydrogen end gas-liquid condensation tank, and is removed and sleeved on the outside of the liquid storage tank after the phase change material changes.

[0012] Furthermore, the phase change material storage tank releases heat when it is sleeved on the outside of the liquid storage tank, and is removed and sleeved on the outside of the oxygen end gas-liquid condensation tank and the hydrogen end gas-liquid condensation tank after the phase change material therein changes phase.

[0013] The beneficial effect of the present invention is that the PEM electrolyzer gas heat recovery and utilization system based on phase change material of the present invention utilizes PCM phase change material to efficiently store and release heat, quickly condenses the gas generated by the electrolyzer to obtain purified gas, and applies this part of heat to preheat the electrolyte in the liquid storage tank, thereby increasing the initial reaction temperature through preheating, effectively accelerating the electrolysis rate while improving the heat recovery utilization rate.

[0014] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0015] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 A schematic diagram of a heat absorption structure of a PEM electrolyzer gas heat recovery and utilization system based on phase change materials according to some embodiments is shown;

[0018] Figure 2 A schematic diagram of the heat release structure of a PEM electrolyzer gas heat recovery and utilization system based on phase change materials according to some embodiments is shown;

[0019] In the picture:

[0020] 1. PEM electrolyzer; 11. First outlet; 12. Second outlet; 2. Thermocouple; 3. Peristaltic pump; 4. Hydrogen end gas-liquid condensation tank; 5. Oxygen end gas-liquid condensation tank; 6. Phase change material storage tank; 7. Liquid storage tank. DETAILED DESCRIPTION

[0021] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0022] like Figure 1 and Figure 2 As shown, at least one embodiment provides a PEM electrolyzer gas heat recovery and utilization system based on phase change material, comprising: a PEM electrolyzer, wherein the anode and cathode of the PEM electrolyzer are respectively provided with a first outlet and a second outlet, the first outlet is connected to the oxygen end gas-liquid condensation tank, and the second outlet is connected to the hydrogen end gas-liquid condensation tank; the other ends of the oxygen end gas-liquid condensation tank and the hydrogen end gas-liquid condensation tank are respectively connected to liquid storage tanks, and the liquid storage tank forms a loop by being connected to the PEM electrolyzer by a peristaltic pump; wherein a phase change material storage tank is provided on the outside of at least one of the liquid storage tank, the oxygen end gas-liquid condensation tank and the hydrogen end gas-liquid condensation tank.

[0023] In this embodiment, specifically, the PEM electrolyzer is further connected to a thermocouple for cooperating with the phase change material storage tank to heat the PEM electrolyzer, so as to increase the startup rate of the electrolyzer.

[0024] In this embodiment, specifically, the temperature of the PEM electrolyzer is 50-80°C.

[0025] In this embodiment, specifically, the first outlet is connected to the oxygen end gas-liquid condensation tank through a stainless steel gas pipe; the second outlet is connected to the hydrogen end gas-liquid condensation tank through a stainless steel gas pipe.

[0026] In this embodiment, specifically, the phase change material in the phase change material storage tank includes any one or more combinations of polyethylene glycol (PEG-800), CaCl2·6H2O, Na2SO4·10H2O and Na2CO3·10H2O, and the temperature of the phase change material is about 30°C to fully recover the heat carried away by the generated gas.

[0027] In this embodiment, specifically, the phase change material storage tank absorbs heat when it is sleeved on the outside of the oxygen end gas-liquid condensation tank and the hydrogen end gas-liquid condensation tank, and is removed and sleeved on the outside of the liquid storage tank after the phase change material changes.

[0028] In this embodiment, specifically, the phase change material storage tank releases heat when it is sleeved on the outside of the liquid storage tank, and is removed and sleeved on the outside of the oxygen end gas-liquid condensation tank and the hydrogen end gas-liquid condensation tank after the phase change material therein changes phase.

[0029] In this embodiment, specifically, the phase change material storage tank is detachable and movable. After the phase change material is completely phase-changed, the phase change material storage tank is moved to the liquid storage tank, the electrolyte in the liquid storage tank is heated, and the phase change material is regenerated.

[0030] In this embodiment, specifically, the PEM electrolyzer is the main reactor that electrolyzes the electrolyte to produce hydrogen and oxygen, and the reactor has a certain amount of heat loss; the liquid storage tank provides electrolyte to the PEM electrolyzer through a peristaltic pump; the gas-liquid separation tank is connected to the hydrogen and oxygen outlets of the PEM electrolyzer, condenses the water vapor brought out by the generated gas, purifies the gas, collects the electrolyte and recycles it; the water vapor is condensed and purified by the heat absorption of the phase change material, and the heat brought by the gas is recovered in the phase change material; after the phase change of the phase change material is completed, it is moved outside the liquid storage tank to preheat the electrolyte in the liquid storage tank, increase the reaction temperature, and accelerate the startup speed of the PEM electrolyzer.

[0031] In summary, the PEM electrolyzer gas heat recovery and utilization system based on phase change material of the present invention utilizes PCM phase change material to efficiently store and release heat, quickly condenses the gas generated by the electrolyzer to obtain purified gas, and applies this heat to preheat the electrolyte in the liquid storage tank. The initial reaction temperature is increased through preheating, which effectively accelerates the electrolysis rate while improving the heat recovery utilization rate.

[0032] In the description of the embodiments of the present invention, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0033] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. There may be other division methods in actual implementation. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. With the above-mentioned ideal embodiments of the present invention as inspiration, and through the above-mentioned description, relevant staff can make various changes and modifications without departing from the scope of the technical idea of ​​this utility model. The technical scope of this utility model is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A PEM electrolyzer gas heat recovery system based on phase change materials, characterized in that: include: A PEM electrolyzer, wherein the anode and cathode of the PEM electrolyzer are respectively provided with a first outlet and a second outlet, the first outlet is connected to the oxygen end gas-liquid condensation tank, and the second outlet is connected to the hydrogen end gas-liquid condensation tank; The other ends of the oxygen end gas-liquid condensation tank and the hydrogen end gas-liquid condensation tank are respectively connected to the liquid storage tank, and the liquid storage tank is connected to the PEM electrolyzer to form a loop through the peristaltic pump; At least one of the liquid storage tank, the oxygen end gas-liquid condensation tank and the hydrogen end gas-liquid condensation tank is sheathed with a phase change material storage tank on its outer side; The phase change material storage tank is mounted on the outer sides of the oxygen end gas-liquid condensation tank and the hydrogen end gas-liquid condensation tank to absorb heat, and after the phase change material undergoes phase change, it is removed and mounted on the outer sides of the liquid storage tank; The phase change material storage tank releases heat when it is sleeved on the outside of the liquid storage tank, and is removed and sleeved on the outside of the oxygen end gas-liquid condensation tank and the hydrogen end gas-liquid condensation tank after the phase change material therein changes phase.

2. The PEM electrolyzer gas heat recovery system based on phase change material according to claim 1, characterized in that: The PEM electrolyzer is also connected to a thermocouple.

3. The PEM electrolyzer gas heat recovery system based on phase change material according to claim 1, characterized in that: The temperature of the PEM electrolyzer is 50-80°C.

4. The PEM electrolyzer gas heat recovery system based on phase change material according to claim 1, characterized in that: The first outlet is connected to the oxygen end gas-liquid condensation tank through a stainless steel gas pipe; the second outlet is connected to the hydrogen end gas-liquid condensation tank through a stainless steel gas pipe.

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