Water electrolysis system capable of accelerating cold start

Abstract

The utility model provides an electrolyzed water system for accelerating cold start, which comprises an electrolytic bath, a first three-way valve fixedly connected to the liquid output end of the electrolytic bath, an electric heater and a heat exchanger fixedly connected to the output end of the first three-way valve respectively, and a second three-way valve fixedly connected to the output ends of the electric heater and the heat exchanger. The output end of the second three-way valve is fixedly connected with a circulating pump, the output end of the circulating pump is fixedly connected with a filter, and the output end of the filter communicates with the output end of the electrolytic bath. According to the alkaline water electrolysis system, the problems of low alkali liquor heating rate and long cold start time caused by low current density are solved, the cold start bypass is additionally arranged, the alkali liquor is rapidly heated to the reaction temperature by using renewable electric energy in an electric heating mode, the cold start time is shortened, and the service life of the system is prolonged. And the system performance is improved, and low-purity hydrogen is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electrolyzed water systems, and specifically to an electrolyzed water system for accelerating cold start-up. Background Technique

[0002] Hydrogen has the advantages of high energy density, long storage time, and low loss, and is an indispensable part of modern chemical industry. It is widely used in oil refining and the production of ammonia, methanol, and steel. However, at present, more than 96% of hydrogen comes from thermochemical reforming of traditional fossil resources, which is incompatible with carbon emission reduction requirements. Green and low-carbon development is an inevitable choice, and renewable energy transformation and improvement of energy utilization efficiency are the only way. Hydrogen production by electrolyzing water is a new technology for realizing truly green hydrogen production using renewable energy. Water electrolysis technologies mainly include alkaline water electrolysis (AWE), proton exchange membrane water electrolysis (PEM), and solid oxide electrolytic cell (SOEC). Among them, AWE occupies the largest market share and has the advantages of low investment cost, durability, and mature technology. The cold start-up time of kW-MW scale AWE systems is usually 1-3 hours. Its long start-up time causes many problems when combined with renewable energy. At the same time, the hydrogen produced during this process has to be discharged into the atmosphere due to low purity, resulting in energy waste and aggravating the greenhouse effect. Temperature is the main factor affecting the start-up time. The AWE current density is low, making the heating rate of its lye very slow. Therefore, accelerating the heating rate of the lye to quickly reach the reaction temperature can greatly reduce the cold start-up time.

[0003] Therefore, in view of the above problems, we propose an electrolyzed water system for accelerating cold start-up. Content of the Utility Model

[0004] The purpose of the utility model is to provide an electrolyzed water system for accelerating cold start-up to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: An electrolyzed water system for accelerating cold start-up, including an electrolytic cell. The liquid output end of the electrolytic cell is fixedly connected with a first three-way valve. The output ends of the first three-way valve are respectively fixedly connected with an electric heater and a heat exchanger. The output ends of the electric heater and the heat exchanger are fixedly connected with a second three-way valve. The output end of the second three-way valve is fixedly connected with a circulation pump. The output end of the circulation pump is fixedly connected with a filter, and the output end of the filter is communicated with the output end of the electrolytic cell.

[0006] As a further description of the utility model: The power input end of the electrolytic cell is electrically connected with a rectifier. The power input end of the rectifier is electrically connected with a second transformer. The power input end of the second transformer is electrically connected with new energy electricity.

[0007] As a further description of the present utility model: The power input end of the electric heater is electrically connected to a first transformer, and the power input end of the second transformer is connected to the power output end of the new energy power.

[0008] As a further description of the present utility model: A refrigerator is fixedly installed at the heat exchange connection port of the heat exchanger.

[0009] As a further description of the present utility model: An oxygen gas-liquid separator and a hydrogen gas-liquid separator are also installed between the first three-way valve and the heat exchanger, and the pipelines of the oxygen gas-liquid separator and the hydrogen gas-liquid separator are connected in series.

[0010] Compared with the prior art, the beneficial effects of the present utility model are:

[0011] The present utility model designs an electric heater on an electrolyzed water system for accelerating cold start. During use, by adding a cold start bypass, the electric heating method is adopted to quickly heat the alkaline solution to the reaction temperature using renewable electric energy, thereby accelerating the cold start time, improving the system performance, and reducing the generation of low-purity hydrogen. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the system flow of the present utility model.

[0013] In the figure: 1. electrolytic cell; 2. first three-way valve; 3. electric heater; 4. heat exchanger; 5. second three-way valve; 6. circulation pump; 7. filter; 8. rectifier; 9. second transformer; 10. new energy power; 11. first transformer; 12. oxygen gas-liquid separator; 13. hydrogen gas-liquid separator; 14. refrigerator. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0015] Please refer to Figure 1 , the present utility model provides a technical solution: An electrolyzed water system for accelerating cold start, including an electrolytic cell 1. The liquid output end of the electrolytic cell 1 is fixedly connected to a first three-way valve 2. The output end of the first three-way valve 2 is respectively fixedly connected to an electric heater 3 and a heat exchanger 4. The output ends of the electric heater 3 and the heat exchanger 4 are fixedly connected to a second three-way valve 5. The output end of the second three-way valve 5 is fixedly connected to a circulation pump 6. The output end of the circulation pump 6 is fixedly connected to a filter 7. The output end of the filter 7 is communicated with the output end of the electrolytic cell 1.

[0016] In this embodiment: The power input end of the electrolytic cell 1 is electrically connected to a rectifier 8, the power input end of the rectifier 8 is electrically connected to a second transformer 9, and the power input end of the second transformer 9 is electrically connected to a new energy power source 10.

[0017] During specific use: The new energy power source 10 provides direct current for the electrolytic cell 1 after passing through the second transformer 9 and the rectifier 8.

[0018] In this embodiment: The power input end of the electric heater 3 is electrically connected to a first transformer 11, and the power input end of the second transformer 9 is connected to the power output end of the new energy power source 10.

[0019] During specific use: The new energy power source 10 provides alternating current for the electric heater 3 after passing through the first transformer 11.

[0020] In this embodiment: A refrigerator 14 is fixedly installed at the heat exchange connection port of the heat exchanger 4.

[0021] During specific use: The refrigerator 14 provides a cold source for the heat exchanger 4 to perform heat exchange and cooling.

[0022] In this embodiment: An oxygen gas-liquid separator 12 and a hydrogen gas-liquid separator 13 are also installed between the first three-way valve 2 and the heat exchanger 4, and the pipelines of the oxygen gas-liquid separator 12 and the hydrogen gas-liquid separator 13 are connected in series.

[0023] During specific use: The oxygen gas-liquid separator 12 and the hydrogen gas-liquid separator 13 can collect the oxygen and hydrogen generated by the electrolysis of the alkali solution in the electrolytic cell 1.

[0024] Working principle: When in use, when the electrolytic cell 1 is running, the new energy power source 10, the second transformer 9, and the rectifier 8 provide electrical energy for the electrolytic cell 1. The electrolytic cell 1 reacts to generate oxygen and hydrogen, which successively pass through the first three-way valve 2, the oxygen gas-liquid separator 12, the hydrogen gas-liquid separator 13, the heat exchanger 4, the second three-way valve 5, the circulation pump 6, and the filter 7, and the alkali solution is circulated back into the electrolytic cell 1. When the electrolytic cell 1 is started, the new energy power source 10 provides electrical energy for the electric heater 3 through the first transformer 11. The electrolytic cell 1 does not react, the new energy power source 10 does not provide electrical energy for the electrolytic cell 1, the electrolytic cell 1 does not generate hydrogen and oxygen, and the second transformer 9, the rectifier 8, the oxygen gas-liquid separator 12, the hydrogen gas-liquid separator 13, the heat exchanger 4, and the refrigerator 14 do not work. The alkali solution in the electrolytic cell 1 passes through the first three-way valve 2, the electric heater 3, the second three-way valve 5, the circulation pump 6, and the filter 7, and the alkali solution is circulated back into the electrolytic cell 1. After the alkali solution is heated to the reaction temperature, the electric heater 3 is turned off, and the normal operation circuit of the electrolytic cell 1 is started.

[0025] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A water electrolysis system for accelerating cold start, comprising an electrolytic cell (1), characterized in that: The liquid output end of the electrolytic cell (1) is fixedly connected to a first three-way valve (2), the output ends of the first three-way valve (2) are respectively fixedly connected to an electric heater (3) and a heat exchanger (4), the output ends of the electric heater (3) and the heat exchanger (4) are fixedly connected to a second three-way valve (5), the output end of the second three-way valve (5) is fixedly connected to a circulation pump (6), the output end of the circulation pump (6) is fixedly connected to a filter (7), and the output end of the filter (7) is in communication with the output end of the electrolytic cell (1).

2. A water electrolysis system for accelerating cold start according to claim 1, characterized in that: The power input end of the electrolytic cell (1) is electrically connected to a rectifier (8), the power input end of the rectifier (8) is electrically connected to a second transformer (9), and the power input end of the second transformer (9) is electrically connected to new energy electricity (10).

3. A water electrolysis system for accelerating cold start according to claim 2, characterized in that: The power input end of the electric heater (3) is electrically connected to the first transformer (11), and the power input end of the second transformer (9) is connected to the power output end of the new energy electricity (10).

4. The electrolyzed water system for accelerating cold start according to claim 1, characterized in that: A refrigerator (14) is fixedly mounted on the heat exchange connection port of the heat exchanger (4).

5. The electrolytic water system for accelerating cold start according to claim 4, characterized in that: An oxygen gas-liquid separator (12) and a hydrogen gas-liquid separator (13) are also installed between the first three-way valve (2) and the heat exchanger (4), wherein the pipelines of the oxygen gas-liquid separator (12) and the hydrogen gas-liquid separator (13) are connected in series.

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