阅读说明：本技术 制氢储能系统压缩能回收利用系统 (System for recycling compression energy of hydrogen production energy storage system ) 是由 杨志芳 刘亚青 崔磊 桂远乾 贺徽 曹阳 洪玮 徐则诚 于 2019-09-30 设计创作，主要内容包括：本发明提供了一种制氢储能系统压缩能回收利用系统,包括高压储氢/储氧罐、高压气体输送管道、低压氢/氧输入管道、低压氢/氧输出管道、多级减压/加压系统、发电电动机、传动轴；多级减压/加压系统包括压缩泵；高压储氢/储氧罐与高压气体输送管道相连通；高压气体管道上设置有多级减压/加压系统；高压气体管道设置有相连通的低压氢/氧输入管道和低压氢/氧输出管道；所述多级减压/加压系统位于高压储氢/储氧罐与低压氢/氧输入管道之间；低压氢/氧输入管道比低压氢/氧输出管道更靠近高压储氢/储氧罐；压缩泵的通过传动轴与发电电动机相连接。本发明实现压缩能发电,提高制氢储能系统能量利用效率。(The invention provides a compressed energy recycling system of a hydrogen production energy storage system, which comprises a high-pressure hydrogen storage/oxygen storage tank, a high-pressure gas conveying pipeline, a low-pressure hydrogen/oxygen input pipeline, a low-pressure hydrogen/oxygen output pipeline, a multi-stage decompression/pressurization system, a power generation motor and a transmission shaft, wherein the high-pressure hydrogen storage/oxygen storage tank is connected with the high-pressure gas conveying pipeline; the multi-stage depressurization/pressurization system includes a compression pump; the high-pressure hydrogen storage/oxygen storage tank is communicated with the high-pressure gas conveying pipeline; a multi-stage pressure reducing/increasing system is arranged on the high-pressure gas pipeline; the high-pressure gas pipeline is provided with a low-pressure hydrogen/oxygen input pipeline and a low-pressure hydrogen/oxygen output pipeline which are communicated; the multi-stage pressure reducing/pressurizing system is positioned between the high-pressure hydrogen/oxygen storage tank and the low-pressure hydrogen/oxygen input pipeline; the low pressure hydrogen/oxygen input conduit is closer to the high pressure hydrogen storage/oxygen storage tank than the low pressure hydrogen/oxygen output conduit; the compression pump is connected with the generator motor through a transmission shaft. The invention realizes the power generation by the compressed energy and improves the energy utilization efficiency of the hydrogen production and energy storage system.)

1. A compressed energy recycling system of a hydrogen production energy storage system is characterized by comprising a high-pressure hydrogen storage/oxygen storage tank, a high-pressure gas conveying pipeline, a low-pressure hydrogen/oxygen input pipeline, a low-pressure hydrogen/oxygen output pipeline, a multi-stage decompression/pressurization system, a power generation motor and a transmission shaft; the multi-stage depressurization/pressurization system includes a compression pump; the high-pressure hydrogen storage/oxygen storage tank is communicated with the high-pressure gas conveying pipeline; a multi-stage pressure reducing/increasing system is arranged on the high-pressure gas pipeline; the high-pressure gas pipeline is provided with a low-pressure hydrogen/oxygen input pipeline and a low-pressure hydrogen/oxygen output pipeline which are communicated; a compression pump is arranged between the high-pressure hydrogen/oxygen storage tank and the low-pressure hydrogen/oxygen input pipeline; the compression pump is connected with the generator motor through a transmission shaft;

The high-pressure hydrogen/oxygen storage tank is used for inputting or outputting high-pressure hydrogen/oxygen through a high-pressure gas conveying pipeline;

when the gas is compressed, the low-pressure hydrogen/oxygen input by the low-pressure hydrogen/oxygen input pipeline is pressurized by the multi-stage decompression/pressurization system and then input into the high-pressure hydrogen storage/oxygen storage tank; the compression pump is used for compressing gas, and the generator motor is used as a motor to drive the compression pump to operate through a transmission shaft;

When releasing gas, the high-pressure hydrogen/oxygen output by the high-pressure hydrogen/oxygen storage tank is decompressed by the multistage decompression/pressurization system and then is output by the low-pressure hydrogen/oxygen output pipeline; the generator motor is used as a generator, and the high-pressure hydrogen/oxygen gas drives the compression pump to rotate when flowing to the low-pressure hydrogen/oxygen output pipeline, and drives the generator motor to rotate through the transmission shaft to output electric energy.

2. The hydrogen-producing energy storage system compression energy recycling system of claim 1, characterized in that: the low-pressure hydrogen/oxygen input pipeline and the compression pump comprise a plurality of low-pressure hydrogen/oxygen input pipelines and compression pumps; the compression pump is arranged between the high-pressure hydrogen/oxygen storage tank and the low-pressure hydrogen/oxygen input pipeline or between two adjacent low-pressure hydrogen/oxygen input pipelines.

3. The system for recycling the compression energy of the hydrogen-production energy storage system according to claim 1, characterized by further comprising a low-pressure gas delivery pipeline; the low-pressure gas conveying pipeline is arranged at the tail end of the high-pressure gas conveying pipeline; the input end of the low-pressure gas conveying pipeline is communicated with the output end of the high-pressure gas conveying pipeline; the low pressure gas delivery line outputs hydrogen/oxygen gas to the hydrogen fuel cell system for use as a feedstock.

4. The system for recycling the compression energy of the hydrogen production energy storage system according to claim 3, wherein a compression pump is arranged between the tail ends of the low-pressure gas conveying pipeline and the high-pressure gas conveying pipeline; the compression pump is connected with the generator motor through a transmission shaft.

5. The system for recycling the compression energy of the hydrogen-producing energy storage system according to claim 4, wherein the output end of the generator motor is electrically connected with the AC power user side; and supplying power to an alternating current user.

6. The hydrogen-producing energy storage system compression energy recycling system of claim 4, further comprising a DC/AC system; the input end of the DC/AC system is electrically connected with the output end of the hydrogen fuel cell system; the output end of the DC/AC system is electrically connected with the AC power consumer side; and the direct current power generated by the hydrogen fuel cell system is inverted by the DC/AC system to supply power to alternating current users.

7. The system for recycling the compression energy of the hydrogen production and energy storage system according to claim 3, wherein valves are arranged at the tail ends of the low-pressure hydrogen/oxygen input pipeline, the low-pressure hydrogen/oxygen output pipeline and the high-pressure gas pipeline.

Technical Field

The invention relates to the technical field of water conservancy and hydropower, in particular to a compressed energy recycling system of a hydrogen production energy storage system.

Background

With the development of technology, the realization of hydrogen production and energy storage with high technical economy in hydropower stations is gradually realized.

the storage pressure of hydrogen and oxygen generated by conventional electrolytic hydrogen production is within 3MPa, and the pressure of hydrogen input to a proton exchange membrane of the hydrogen fuel cell is about 0.16 MPa. The hydrogen storage pressure currently used in the automobile industry is about 35MPa to 100 MPa. The storage space can be reduced more by using higher pressure for hydrogen energy storage, but the consumed energy is higher.

Therefore, in the process of storing hydrogen and oxygen, a compression pump is generally arranged to pressurize gas in the pipeline, so that certain storage pressure is reached, and transportation and storage with smaller volume are facilitated. The above-described pressurization process consumes a large amount of electric power.

When hydrogen is supplied to and oxygen is supplied to the proton exchange membrane of the hydrogen fuel cell, because the storage pressure is higher than the input gas pressure of the proton exchange membrane, a pressure reducing valve is generally arranged in a transmission pipeline for reducing the pressure, so that the gas pressure reaches the required input value. The decompression process releases a large amount of compression energy but fails to utilize the compression energy, resulting in energy waste.

Disclosure of Invention

The invention aims to provide a system for recycling compressed energy of a hydrogen production energy storage system, which aims to overcome the defects of the prior art, realize the forward/reverse reciprocal process of compressed storage of hydrogen and decompression release of a hydrogen fuel cell, realize power generation of the compressed energy by collecting and utilizing the energy of the system, and improve the energy utilization efficiency of the hydrogen production energy storage system.

The invention provides a compressed energy recycling system of a hydrogen production energy storage system, which is characterized by comprising a high-pressure hydrogen storage/oxygen storage tank, a high-pressure gas conveying pipeline, a low-pressure hydrogen/oxygen input pipeline, a low-pressure hydrogen/oxygen output pipeline, a multi-stage decompression/pressurization system, a power generation motor and a transmission shaft, wherein the high-pressure hydrogen storage/oxygen storage tank is connected with the high-pressure gas conveying pipeline; the multi-stage depressurization/pressurization system includes a compression pump; the high-pressure hydrogen storage/oxygen storage tank is communicated with the high-pressure gas conveying pipeline; a multi-stage pressure reducing/increasing system is arranged on the high-pressure gas pipeline; the high-pressure gas pipeline is provided with a low-pressure hydrogen/oxygen input pipeline and a low-pressure hydrogen/oxygen output pipeline which are communicated; a compression pump is arranged between the high-pressure hydrogen/oxygen storage tank and the low-pressure hydrogen/oxygen input pipeline; the low-pressure hydrogen/oxygen input pipeline and the low-pressure hydrogen/oxygen output pipeline can be mutually replaced and used; the compression pump is connected with the generator motor through a transmission shaft;

the high-pressure hydrogen/oxygen storage tank is used for inputting or outputting high-pressure hydrogen/oxygen through a high-pressure gas conveying pipeline;

When the gas is compressed, the low-pressure hydrogen/oxygen input by the low-pressure hydrogen/oxygen input pipeline is pressurized by the multi-stage decompression/pressurization system and then input into the high-pressure hydrogen storage/oxygen storage tank; the compression pump is used for compressing gas, and the generator motor is used as a motor to drive the compression pump to operate through a transmission shaft;

When releasing gas, the high-pressure hydrogen/oxygen output by the high-pressure hydrogen/oxygen storage tank is decompressed by the multistage decompression/pressurization system and then is output by the low-pressure hydrogen/oxygen output pipeline; the generator motor is used as a generator, and the high-pressure hydrogen/oxygen gas drives the compression pump to rotate when flowing to the low-pressure hydrogen/oxygen output pipeline, and drives the generator motor to rotate through the transmission shaft to output electric energy.

In the technical scheme, the low-pressure hydrogen/oxygen input pipeline and the compression pump comprise a plurality of low-pressure hydrogen/oxygen input pipelines and compression pumps; the compression pump is arranged between the high-pressure hydrogen/oxygen storage tank and the low-pressure hydrogen/oxygen input pipeline or between two adjacent low-pressure hydrogen/oxygen input pipelines.

in the technical scheme, the device also comprises a low-pressure gas conveying pipeline; the low-pressure gas conveying pipeline is arranged at the tail end of the high-pressure gas conveying pipeline; the input end of the low-pressure gas conveying pipeline is communicated with the output end of the high-pressure gas conveying pipeline; the low pressure gas delivery line outputs hydrogen/oxygen gas to the hydrogen fuel cell system for use as a feedstock.

In the technical scheme, a compression pump is arranged between the tail ends of the low-pressure gas conveying pipeline and the high-pressure gas conveying pipeline; the compression pump is connected with the generator motor through a transmission shaft.

In the technical scheme, the output end of the generator motor is electrically connected with an alternating current power user side; and supplying power to an alternating current user.

In the above technical solution, the system further comprises a DC/AC system; the input end of the DC/AC system is electrically connected with the output end of the hydrogen fuel cell system; the output end of the DC/AC system is electrically connected with the AC power consumer side; and the direct current power generated by the hydrogen fuel cell system is inverted by the DC/AC system to supply power to alternating current users.

In the above technical scheme, the low pressure hydrogen/oxygen input pipeline, the low pressure hydrogen/oxygen output pipeline and the high pressure gas pipeline are all provided with valves at the tail ends.

In the hydrogen production and energy storage system based on the hydropower station, low-pressure hydrogen/oxygen generated by an electrolytic hydrogen production system is pressurized by a multi-stage pressure reduction/pressurization system through a low-pressure hydrogen/oxygen input pipeline and then stored in a high-pressure hydrogen storage/oxygen storage tank through a high-pressure gas conveying pipeline; different pressurizing requirements of different input gases are met; the high-pressure gas in the high-pressure hydrogen storage/oxygen storage tank is depressurized to a certain pressure through a multi-stage depressurization/pressurization system, and is generally reduced to 0.16Mpa if the hydrogen/oxygen gas is used for fuel cell power generation, and the pressure value of a hydrogen/oxygen delivery pressure tank truck or the pressure value of a delivery pipeline is considered if the hydrogen/oxygen gas is used for supplying hydrogen/oxygen products to users. In the process, the generator motor is in the working condition of the generator, the gas drives the blades to rotate when passing through the compression pump, and the generator is driven to rotate through the transmission shaft to generate electric energy. The invention leads the compression storage of hydrogen and the decompression release of the hydrogen fuel cell to form a forward/reverse reciprocal process, realizes the power generation of the compression energy by collecting and utilizing the energy of the system, and improves the energy utilization efficiency of the hydrogen production and energy storage system.

drawings

FIG. 1 is a diagram of a system for recycling compression energy of a hydrogen production energy storage system

The reference numerals are explained below:

1. A high pressure hydrogen/oxygen storage tank; 2. a high pressure gas delivery conduit; 3. a low pressure hydrogen/oxygen input line; 4. a low pressure hydrogen/oxygen output line; 5. hydrogen/oxygen delivery pressure tankers; 6. a valve; 7. a multi-stage depressurization/pressurization system; 8. a compression pump; 9. a generator motor; 10. a hydrogen fuel cell system; 11. a DC/AC system; 12. an AC power consumer side; 13. a low pressure gas delivery conduit; 14. a drive shaft.

Detailed Description

The invention will be further described in detail with reference to the following drawings and specific examples, which are not intended to limit the invention, but are for clear understanding.

As shown in FIG. 1, the system for recycling the compression energy of the hydrogen production energy storage system comprises the following main components: the system comprises a high-pressure hydrogen/oxygen storage tank 1, a high-pressure gas conveying pipeline 2, a low-pressure hydrogen/oxygen input pipeline 3, a low-pressure hydrogen/oxygen output pipeline 4, a valve 6, a multi-stage pressure reducing/pressurizing system 7, a compression pump 8, a power generation motor 9, a hydrogen fuel cell system 10, a DC/AC system 11, a low-pressure gas conveying pipeline 13 and a transmission shaft 14.

The high-pressure hydrogen storage/oxygen storage tank 1 is used for storing hydrogen and oxygen generated by the electrolytic hydrogen production system in a high-pressure mode, and the gas pressure stored in the high-pressure hydrogen storage/oxygen storage tank 1 is 3 MPa-1000 MPa and is changed according to the specific industrial system composition scheme. The high-pressure hydrogen/oxygen storage tank 1 can be a conventional pressure steel tank, and can also be a large-capacity high-pressure storage device modified by industrial facilities such as a karst cave, a construction branch cave and the like.

The high-pressure gas conveying pipeline 2 is used for inputting or outputting high-pressure hydrogen/oxygen, and the gas pressure value is 3 MPa-1000 MPa.

the low-pressure hydrogen/oxygen input pipeline 3 is used for inputting low-pressure hydrogen/oxygen gas generated by the electrolytic hydrogen production system, the pressure value of the gas is between 0.1MPa and 3MPa, and the pressure value is changed according to the specific industrial system composition scheme. The gas conveyed by the low-pressure hydrogen/oxygen input pipeline 3 is stored in the high-pressure hydrogen/oxygen storage tank 1 through a multi-stage pressurizing system

The low pressure hydrogen/oxygen output conduit 4 is used to deliver hydrogen/oxygen product (e.g., gas delivery conduit) to a hydrogen/oxygen delivery pressure tanker 5 or other type of hydrogen/oxygen customer.

The valve 6 is used to open or close the delivery function of the pipeline.

A multi-stage depressurization/pressurization system 7 is used to pressurize or depressurize the gas within the pipeline. Fig. 1 shows a 2-stage depressurization/pressurization system, but an actual industrial configuration may have multiple stages or only one stage, and this figure is merely an example. It should be noted that the number of stages of the multi-stage depressurization/pressurization system 7 does not limit the scope of protection of this patent.

The compression pump 8 is an important component of the multistage depressurization/pressurization system 7 for pressurizing or depressurizing gas.

The generator motor 9 is a power source of the compression pump 8, and functions as a motor for pressurizing and storing gas when compressing the gas; when releasing gas, it works as the generator, when high-pressure gas releases to the low pressure side, drives the compression pump 8 to rotate, drives the generator to rotate through the transmission shaft, outputs electric energy.

The hydrogen fuel cell system 10 is configured to receive low pressure hydrogen and oxygen and generate dc power through the proton exchange membrane.

The DC/AC system 11 is used to invert the DC power delivered by the fuel cell system and supply the AC power to AC consumers.

The low-pressure gas delivery pipe 13 is used for delivering hydrogen/oxygen gas which meets the safe and stable operation of the proton exchange membrane to the fuel cell system.

The drive shaft is used for power transmission between the generator motor 9 and the compression pump 8.

The working process of the system is as follows:

(1) Storage working condition: low-pressure hydrogen/oxygen (0.1-3 Mpa) generated by the electrolytic hydrogen production system is input into the system through a low-pressure hydrogen/oxygen input pipeline 3, the gas is pressurized to 3-1000 Mpa through a multistage pressure reducing/pressurizing system 7, and the gas is stored in a high-pressure hydrogen storage/oxygen storage tank 1 through a high-pressure gas conveying pipeline 2. Different gases are fed from different low pressure hydrogen/oxygen feed lines 3 to pass through different stages of compression pumps to meet different pressurization requirements for the different feed gases. In the process, the generator motor 9 is in the working condition of the motor, receives the electric energy provided by the service power system, drives the compression pump 8 to operate through the transmission shaft, and compresses low-pressure gas.

(2) Releasing the working condition: the high-pressure gas in the high-pressure hydrogen/oxygen storage tank 1 is depressurized to a certain pressure through a multi-stage depressurization/pressurization system 7, and generally reduced to 0.16Mpa if the hydrogen/oxygen gas is used for hydrogen fuel cell power generation, and the pressure value of the hydrogen/oxygen delivery pressure tanker 5 or the pressure value of the delivery pipeline is considered if the hydrogen/oxygen gas is used for supplying hydrogen/oxygen products to users. In the process, the generator motor 9 is in a working condition of the generator, the gas drives the blades to rotate when passing through the compression pump 8, and the generator is further driven to rotate through the transmission shaft to generate electric energy. The output end of the generator motor is electrically connected with an alternating current power user side; and supplying power to an alternating current user. The direct current power generated by the hydrogen fuel cell system is inverted by the DC/AC system to supply power to the alternating current user

Details not described in this specification are within the skill of the art that are well known to those skilled in the art.