CN216891238U - A photovoltaic, photothermal, and heat storage combined electrolysis water hydrogen production system - Google Patents

Abstract

The present application proposes a combined photovoltaic, photothermal, and heat storage electrolytic water hydrogen production system, which includes an electrolytic cell, a gas-liquid separation device, and a circulating pump that are connected end-to-end through pipelines, and a photovoltaic power generation device. The photovoltaic power generation device It is electrically connected to the electrolytic cell, and also includes a photothermal device and a heat collecting device that are connected end to end with the photovoltaic power generation device through pipelines, and a heat collecting medium is arranged in the heat collecting device. The path flows through the photovoltaic power generation device and the photothermal device to absorb heat. By setting the heat collector, the heat collector collects the cooling waste heat and light heat of the solar photovoltaic panel and the photothermal device through the pipeline, and the hydrogen production system is used at night. Insulation maintains the continuity of the photovoltaic hydrogen production process and reduces the comprehensive energy consumption of the hydrogen production process; builds a comprehensive energy system, improves the photovoltaic power generation efficiency, and improves the utilization rate of low-quality light and heat.

Description

A photovoltaic, photothermal, and heat storage combined electrolysis water hydrogen production system

technical field

The present application relates to the technical field of electrolytic hydrogen production, in particular to a combined photovoltaic, solar thermal and thermal storage combined electrolytic water hydrogen production system.

Background technique

Photovoltaic power generation, as a green and clean energy encouraged by the state, has continuously increased its installed capacity in recent years. However, photovoltaic power generation has problems such as randomness, volatility, and periodic power supply, which increases the difficulty of photovoltaic hydrogen production. In particular, photovoltaic power generation has unavoidable intermittency between day and night. Hydrogen production can only be generated when there is sufficient light during the day, and hydrogen production cannot be generated without light at night. Hydrogen production by electrolysis of water is an exothermic process. During the daytime, it is necessary to continuously remove excess heat from the system through the electrolyte cooling device. At the same time, solar energy cannot be converted into electricity through photovoltaic power generation during the day, and most of the solar energy cannot be collected. . When hydrogen production is stopped at night, no heat is generated in the system, and the temperature of the electrolyte cools down naturally. After the electrolyte cools down, the conductivity decreases. As a result, it takes a long time for the electrolyzer to heat up to the rated operating temperature when it starts up again.

SUMMARY OF THE INVENTION

The present application aims to solve one of the technical problems in the related art at least to a certain extent.

To this end, the purpose of this application is to propose a combined photovoltaic, photothermal, and heat storage electrolysis water hydrogen production system. By setting a heat collector, the heat collector collects the cooling waste heat of the solar photovoltaic panel and the photothermal device through the pipeline and Photothermal, which keeps the hydrogen production system warm at night, maintains the continuity of the photovoltaic hydrogen production process, and reduces the comprehensive energy consumption of the hydrogen production process; builds a comprehensive energy system, improves the photovoltaic power generation efficiency, and improves the utilization rate of low-quality light and heat.

In order to achieve the above purpose, a photovoltaic, photothermal, and heat storage combined electrolyzed water hydrogen production system proposed in this application includes an electrolytic cell, a gas-liquid separation device and a circulating pump that are connected end-to-end through pipelines, and also includes a photovoltaic power generation device. , the photovoltaic power generation device is electrically connected to the electrolytic cell, and also includes a photothermal device and a heat collecting device that are connected to the photovoltaic power generation device through pipelines in turn, and a heat collecting medium is arranged in the heat collecting device. The heat collecting medium flows through the photovoltaic power generation device and the photothermal device through a pipeline to absorb heat, and the heat collecting device is connected in parallel to the pipe between the gas-liquid separation device and the circulating pump through a first branch pipeline. on the way.

Further, a first valve is arranged on the pipeline between the photovoltaic power generation device and the heat collecting device, and a second valve is arranged on the pipeline between the solar thermal device and the heat collecting device.

Further, a third valve is provided on the first branch pipeline between the heat collecting device and the gas-liquid separation device, and a fourth valve is provided on the first branch pipeline between the heat collecting device and the circulating pump .

Further, a fifth valve is arranged on the pipeline between the gas-liquid separation device and the circulating pump, and the fifth valve is arranged in parallel with the heat collecting device.

Further, the photothermal device is a flat plate heat collector, an evacuated tube heat collector or a trough heat collector.

Further, the heat collecting device is a hot water tank.

Further, an electrolyte cooling device is also included, and the electrolyte cooling device is connected in parallel to the pipeline between the circulating pump and the electrolytic cell through a second branch pipeline.

Further, a sixth valve is also included, the sixth valve is arranged on the pipeline between the circulating pump and the electrolytic cell, and the sixth valve is arranged in parallel with the electrolyte cooling device.

Further, it also includes a seventh valve and an eighth valve, the seventh valve is arranged on the second branch pipeline between the electrolyte cooling device and the electrolytic cell, and the eighth valve is arranged on the electrolyte on the second branch line between the cooling device and the circulating pump.

Further, the electrolytic cell is an alkaline electrolytic cell or a solid polymer electrolytic cell.

Additional aspects and advantages of the present application will be set forth, in part, in the following description, and in part will be apparent from the following description, or learned by practice of the present application.

Description of drawings

The above and/or additional aspects and advantages of the present application will become apparent and readily understood from the following description of embodiments taken in conjunction with the accompanying drawings, wherein:

FIG. 1 is a schematic structural diagram of a combined photovoltaic, photothermal, and thermal storage hydrogen production system proposed in an embodiment of the present application.

Detailed ways

The following describes in detail the embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, but should not be construed as a limitation on the present application. On the contrary, the embodiments of the present application include all changes, modifications and equivalents falling within the spirit and scope of the appended claims.

FIG. 1 is a schematic structural diagram of a combined photovoltaic, photothermal, and thermal storage hydrogen production system proposed in an embodiment of the present application.

Referring to FIG. 1, a photovoltaic, solar thermal, and heat storage combined electrolysis water hydrogen production system includes an electrolytic cell 2, a gas-liquid separation device 3 and a circulating pump 4 connected end to end through pipelines, and also includes a photovoltaic power generation device 1, The photovoltaic power generation device 1 is electrically connected to the electrolytic cell 2, and further includes a photothermal device 6 and a heat collecting device 7 which are connected to the photovoltaic power generation device 1 through pipelines in turn end-to-end, and the heat collecting device 7 is provided with Heat collecting medium, the heat collecting medium flows through the photovoltaic power generation device 1 and the photothermal device 6 to absorb heat, and the heat collecting device 7 is connected in parallel with the gas-liquid separation through the first branch pipeline On the pipeline between device 3 and circulating pump 4.

In this embodiment, a photovoltaic power generation device 1, an electrolytic cell 2, a gas-liquid separation device 3, an electrolyte circulating pump 4, and an electrolyte cooling device 5 constitute an electrolytic hydrogen production system; a photovoltaic power generation device 1, a photothermal device 6, and a heat collector device 7. The auxiliary heating system is formed. The auxiliary heating system and the electrolysis hydrogen production system are coupled with each other to collect and store the waste heat of the photovoltaic power generation device and solar heat, and keep the hydrogen production system warm at night, so that the electrolyte can be kept at a suitable temperature during the day and night. The temperature can maintain the continuity of the photovoltaic hydrogen production process and reduce the comprehensive energy consumption of the hydrogen production process. An electrolytic solution is injected into the electrolytic cell, optionally, the electrolytic solution is KOH alkaline solution or pure water.

In this application, the photovoltaic power generation device 1 adopts liquid cooling, and the photothermal device 6 and the heat collecting device 7 are connected through a pipeline. The photothermal device is used to collect solar heat, so as to increase the temperature of the heat collecting medium in the pipeline, so as to be effective at night. Insulate the hydrogen production system. The heat collecting device is connected to the gas-liquid separation device and the circulating pump through the first branch pipeline to pass the electrolyte. The electrolyte in the pipeline completes the heat exchange with the heat collecting medium in the heat collecting device, and realizes the heat preservation of the electrolyte at night. , to avoid the energy loss during the day and night switching of the operating state of the hydrogen production device, and to improve the overall energy conversion efficiency of the photovoltaic hydrogen production process. Preferably, the heat collecting medium can be water, which is low in cost and easy to obtain.

A first valve 14 is arranged on the pipeline between the photovoltaic power generation device 1 and the heat collecting device 7 , and a second valve 15 is arranged on the pipeline between the solar thermal device 6 and the heat collecting device 7 . By setting the first valve 14 and the second valve 15, the pipeline between the photovoltaic power generation device 1 and the heat collecting device 7 and the pipeline between the solar thermal device 6 and the heat collecting device 7 can be opened and closed It is easy to control the flow state of the heat collecting medium.

A third valve 12 is provided on the first branch line between the heat collecting device 7 and the gas-liquid separation device 3 , and a third valve 12 is provided on the first branch line between the heat collecting device 7 and the circulating pump 4 . Four valves 13. By setting the third valve 12 and the fourth valve 13, the opening and closing control of the first branch pipeline can be realized, which is convenient to control the flow state of the electrolyte, so as to realize whether the electrolyte flows through the heat collector for heat exchange, and improve the efficiency of the hydrogen production system. operation efficiency.

A fifth valve 11 is arranged on the pipeline between the gas-liquid separation device 3 and the circulating pump 4 , and the fifth valve 11 is arranged in parallel with the heat collecting device 7 . By arranging the fifth valve 11 , the fifth valve is closed during the heat preservation and heating of the electrolyte at night, so that the electrolyte completely flows through the heat collecting device for heat exchange, and the heat exchange efficiency is ensured.

The photothermal device 6 is a flat plate heat collector, a vacuum tube heat collector or a trough heat collector. The specific structure of the photothermal device can be selected according to the specific application scenario, which is not limited in this application.

The heat collecting device 7 is a hot water tank. The use of water has the characteristics of a large specific heat capacity, which is conducive to heat storage, thereby ensuring the thermal insulation effect of the electrolyte at night. Of course, in other embodiments, pebble piles may also be placed in the hot water tank to further improve the heat storage capacity of the heat collecting device. This application does not limit this.

A photovoltaic, photothermal, and heat storage combined electrolyzed water hydrogen production system further includes an electrolyte cooling device 5, and the electrolyte cooling device 5 is connected in parallel between the circulating pump 4 and the electrolytic cell 2 through a second branch pipeline. on the pipeline. The electrolyte cooling device 5 is used to cool the electrolyte, so that the electrolyte circulating into the electrolytic cell will not cause the temperature of the electrolytic cell to rise, and the electrolyte cooling device 5 is arranged in parallel between the circulating pump 4 and the electrolytic cell 2. On the pipeline, whether the electrolyte in the pipeline passes through the electrolyte cooling device can be selectively made, which has high flexibility. When the electrolyte cooling device is not needed, the electrolyte cooling device is closed, which is beneficial to improve the service life of the electrolyte cooling device. , the electrolyte cooling device uses an open or closed circulating cooling water system as a cold source.

A photovoltaic, photothermal, and heat storage combined electrolyzed water hydrogen production system further includes a sixth valve 8, and the sixth valve 8 is arranged on the pipeline between the circulating pump 4 and the electrolytic cell 2. The The sixth valve 8 is arranged in parallel with the electrolyte cooling device 5 . The setting of the sixth valve 8 mainly controls the opening and closing of the pipeline between the electrolytic cell 2 and the circulating pump 4, so as to control whether the electrolyte flows through the electrolyte cooling device.

A photovoltaic, photothermal, and heat storage combined electrolysis water hydrogen production system further includes a seventh valve 9 and an eighth valve 10, and the seventh valve 9 is arranged between the electrolyte cooling device 5 and the electrolytic cell 2. On the second branch pipe between the two, the eighth valve 10 is arranged on the second branch pipe between the electrolyte cooling device 5 and the circulating pump 4 . The seventh valve 9 and the eighth valve 10 mainly control the opening and closing of the second branch pipeline where the electrolyte cooling device 5 is located. When the electrolyte cooling device is not working, the electrolyte is prevented from flowing through the second branch pipeline, and the circulation of the electrolyte is improved. efficiency.

Above, preferably, the first valve 14, the second valve 15, the third valve 12, the fourth valve 13, the fifth valve 11, the sixth valve 8, the seventh valve 9 and the eighth valve 10 are all solenoid valves, so that It is used to realize the remote control of the circuit, which is convenient for personnel to operate.

The electrolytic cell 2 is an alkaline electrolytic cell or a solid polymer electrolytic cell. The specific form of the electrolytic cell can be set according to the actual application scenario, which is not limited in this application.

Specifically, the working process of a photovoltaic, solar-thermal, and heat-storage combined electrolysis water hydrogen production system is as follows. During the day, the photovoltaic power generation device 1 generates electricity to supply power to the electrolyzer 2 to produce hydrogen; the seventh valve 9 and the eighth valve 10. The fifth valve 11 is opened, the sixth valve 8, the third valve 12, and the fourth valve 13 are closed, and the electrolyte is cooled through the gas-liquid separation device 3, the electrolyte circulating pump 4, and the electrolyte cooling device 5 to form a cycle; The first valve 14 and the second valve 15 are opened, and the heat collecting medium in the heat collecting device 7 absorbs heat through the photovoltaic power generation device 1 and the photothermal device 6 . At night, the photovoltaic power generation device 1 does not generate electricity, and the electrolytic cell 2 is shut down; the seventh valve 9, the eighth valve 10, and the fifth valve 11 are closed, the sixth valve 8, the third valve 12, and the fourth valve 13 are opened, and the electrolyte passes through. The gas-liquid separation device 3 enters the heat collecting device 7 to absorb heat and keep warm, the first valve 14 and the second valve 15 are closed, and after the heat exchange is completed, it enters the electrolyte circulating pump 4 and flows into the electrolytic cell through the pipeline to form a circulation.

It should be noted that, in the description of the present application, the terms "first", "second" and the like are only used for the purpose of description, and should not be construed as indicating or implying relative importance. Also, in the description of this application, unless otherwise specified, "plurality" means two or more.

Any description of a process or method in the flowcharts or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing a specified logical function or step of the process , and the scope of the preferred embodiments of the present application includes alternative implementations in which the functions may be performed out of the order shown or discussed, including performing the functions substantially concurrently or in the reverse order depending upon the functions involved, which should It is understood by those skilled in the art to which the embodiments of the present application belong.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limitations to the present application. Embodiments are subject to variations, modifications, substitutions and variations.

Claims (10)

1. a combined electrolysis water hydrogen production system of photovoltaic, photothermal and thermal storage, is characterized in that, comprises electrolyzer, gas-liquid separation device and circulating pump which are connected end to end in turn by pipeline, also comprises photovoltaic power generation device, described The photovoltaic power generation device is electrically connected to the electrolytic cell, and further includes a photothermal device and a heat collecting device which are connected to the photovoltaic power generation device through pipelines in turn end-to-end, a heat collecting medium is arranged in the heat collecting device, and the heat collecting device is The medium flows through the photovoltaic power generation device and the photothermal device through pipelines to absorb heat, and the heat collecting device is connected in parallel to the pipeline between the gas-liquid separation device and the circulating pump through a first branch pipeline. 2. The photovoltaic, photothermal, and heat storage combined electrolysis water hydrogen production system according to claim 1, wherein a first valve is provided on the pipeline between the photovoltaic power generation device and the heat collecting device, A second valve is arranged on the pipeline between the photothermal device and the heat collecting device. 3. The photovoltaic, photothermal, and heat storage combined electrolysis water hydrogen production system according to claim 1, wherein a first branch pipe between the heat collecting device and the gas-liquid separation device is provided with a first branch pipe. Three valves, a fourth valve is arranged on the first branch pipeline between the heat collecting device and the circulating pump. 4. The photovoltaic, photothermal, and heat storage combined electrolysis water hydrogen production system according to claim 1, characterized in that, a fifth valve is provided on the pipeline between the gas-liquid separation device and the circulating pump, and the The fifth valve is arranged in parallel with the heat collecting device. 5. The photovoltaic, photothermal, and heat storage combined electrolysis water hydrogen production system according to claim 1, wherein the photothermal device is a flat plate heat collector, a vacuum tube heat collector or a trough heat collector. 6. The photovoltaic, photothermal, and heat storage combined electrolysis water hydrogen production system according to claim 1, wherein the heat collecting device is a hot water tank. 7. The photovoltaic, photothermal, and heat storage combined electrolysis water hydrogen production system according to claim 1, characterized in that, further comprising an electrolyte cooling device, and the electrolyte cooling device is connected in parallel to all the on the pipeline between the circulating pump and the electrolyzer. 8. The photovoltaic, photothermal, and heat storage combined electrolysis water hydrogen production system according to claim 7, further comprising a sixth valve, wherein the sixth valve is arranged on the circulating pump and the electrolytic cell On the pipeline between them, the sixth valve and the electrolyte cooling device are arranged in parallel. 9. The photovoltaic, photothermal, and heat storage combined electrolysis water hydrogen production system according to claim 7, characterized in that, further comprising a seventh valve and an eighth valve, and the seventh valve is arranged on the cooling of the electrolyte. On the second branch pipeline between the device and the electrolytic cell, the eighth valve is arranged on the second branch pipeline between the electrolyte cooling device and the circulating pump. 10 . The photovoltaic, photothermal, and heat storage combined electrolysis water hydrogen production system according to claim 1 , wherein the electrolytic cell is an alkaline electrolytic cell or a solid polymer electrolytic cell. 11 .

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