Hydrogen injection method and system simultaneously suitable for 70Mpa and 35Mpa injection pressure

Abstract

The invention discloses a hydrogen injection method and system simultaneously suitable for 70Mpa and 35Mpa injection pressure. The hydrogen injection system comprises an in-station hydrogen productionunit, an outer hydrogen supply unit, a buffer tank, a low-pressure hydrogen compression unit, a low-pressure hydrogen storage unit, a high-pressure hydrogen compression unit, a high-pressure hydrogenstorage unit, a low-pressure hydrogen injection unit and a high-pressure hydrogen injection unit. The hydrogen injection method utilizes the hydrogen injection system for injecting hydrogen into a terminal user. According to the hydrogen injection method and system simultaneously suitable for 70Mpa and 35Mpa injection pressure, a hydrogen source can be obtained from in-station hydrogen productionand external hydrogen supply, not only the external hydrogen supply can be used for supplementation when an in-station hydrogen production device fails or becomes powerless, but also when the in-station hydrogen production capacity exceeds the self-consumed hydrogen amount of a hydrogen injection station, the hydrogen can be directly charged to a no-load long pipe trailer and sold externally; thecompression devices and hydrogen storage bottle groups with two different design pressure grades are arranged, so that the number of high-pressure hydrogen storage bottles can be reduced, the storagerisk can be reduced, in addition, the hydrogen injection under the two injection pressures in one hydrogen injection station can be realized, and the utilization rate of the hydrogen compression devices and the utilization rate of the hydrogen storage devices is improved.

Description

technical field [0001] The present invention relates to the technical field of hydrogen energy, and more specifically, relates to a hydrogenation method and system suitable for filling pressures of 70MPa and 35MPa. Background technique [0002] As an efficient, clean and sustainable "carbon-free" energy, hydrogen energy has attracted widespread attention from all over the world. The transportation field dominated by hydrogen fuel cell vehicles is one of the important directions of hydrogen energy utilization. At this stage, the bottleneck restricting the development of hydrogen energy utilization in the transportation field is mainly the construction of hydrogen refueling stations, and the lack of hydrogen refueling infrastructure has become the biggest obstacle to the development of my country's hydrogen energy industry. [0003] The sources of hydrogen in hydrogen refueling stations are mainly divided into two types: external hydrogen supply and in-station hydrogen product...

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Problems solved by technology

[0011] (1) Because the hydrogen filling port and the hydrogen output port of the hydrogen storage bottle group 4' are the same port, when the hydrogen storage bottle group 4' supplies gas to the hydrogenation machine 9', the hydrogen compression equipment 3' cannot work, and the hydrogen gas The utilization rate of compression

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