Liquid hydrogen and high-pressure gaseous hydrogen combined hydrogen refueling system based on ejection mixed pressure

Abstract

The invention belongs to the technical field of hydrogenation of hydrogen refueling station, and discloses a liquid hydrogen and high-pressure gaseous hydrogen combined hydrogen refueling system basedon ejection mixed pressure. The system comprises a high-pressure hydrogen storage tank (1), a liquid hydrogen tank (3), a compressor (2), a liquid hydrogen pump (4), a heat exchanger (5) and an ejector (6), wherein the heat exchanger is used for heat exchange treatment to enable high-pressure gaseous hydrogen to release heat so as to obtain gaseous first hydrogen and enable liquid hydrogen to absorb heat so as to obtain gaseous second hydrogen; and the ejector is used for mixing the first hydrogen and the second hydrogen to obtain mixed hydrogen. According to the system, by improving the composition of all components in the system and the matching working mode of the components, high-pressure hydrogen and low-pressure hydrogen are obtained through heat exchange and precooling of the high-pressure gaseous hydrogen and the liquid hydrogen respectively, and mixed pressure of the high-pressure hydrogen and the low-pressure hydrogen is achieved through the ejector; a traditional precoolingunit is saved while the reliability is guaranteed, so that investment, operation and maintenance cost of pre-cooling equipment of the hydrogen refueling station is reduced; and the system is suitablefor the large hydrogen refueling stations for liquid hydrogen and gas hydrogen combined storage.

Description

technical field [0001] The invention belongs to the technical field of hydrogenation at hydrogenation stations, and more specifically relates to a combined hydrogenation system of liquid hydrogen and high-pressure gas hydrogen based on injection mixed pressure, and also a hydrogenation system with pre-cooling suitable for fuel cell vehicles. The hydrogen system can be used in the hydrogen refueling process of the on-board hydrogen refueling station. Background technique [0002] The development of electric vehicles is an effective way to solve the environmental pollution of today's fuel vehicles. Hydrogen fuel cell vehicles are one of the strong competing options. Fuel cell vehicles are developing rapidly all over the world, and already have a certain industrial scale. The Society of Automotive Engineers' "Energy Saving and New Energy Vehicle Technology Roadmap" pointed out that by 2030, China's hydrogen fuel cell vehicles will exceed one million. Hydrogen refueling stati...

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Problems solved by technology

However, the article did not mention the temperature rise caused by the mixed pressure of the two streams. In fact, the mixed pressure of high-pressure hydrogen and low-pressure hydrogen will cause temperature rise, which will endanger the structural safety of vehicle-mounted gas cylinders.

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