Refrigeration cycle method and system for 70MPa hydrogen filling station

Abstract

The invention relates to a refrigeration cycle method and a refrigeration cycle system for a 70MPa hydrogen filling station. The aim is to provide a refrigeration cycle method and a refrigeration cycle system for a 70MPa hydrogen filling station, which are convenient to install, are safe in usage and are low in cost. The method is in a double-refrigeration cycle, comprising the steps of primarily exchanging heat of the cooling liquid with the high pressure hydrogen; performing secondary heat exchange of the cooling liquid after heat exchange with a condensing agent to form a first double-refrigeration cycle; exchanging heat of the cooling liquid after secondary heat exchange with high pressure hydrogen, starting next double-refrigeration cycle. The refrigeration cycle system comprises a first heat exchanger where the high pressure hydrogen and the cooling liquid exchange heat primarily; a second heat exchanger provided with the condensing agent inside, the cooling liquid after primary heat exchange and the condensing agent exchange heat; a refrigerator set connected with the second heat exchanger and used for refrigerating the condensing agent in the second heat exchanger by a compressor.

Description

technical field [0001] The invention belongs to the field of new energy, and relates to a hydrogen precooling method for a hydrogen refueling station, in particular to a refrigeration cycle method and system for a 70MPa hydrogen refueling station. Background technique [0002] Fuel cell vehicle technology is a high-efficiency, zero-emission clean vehicle technology that uses hydrogen as fuel and converts hydrogen into electricity as a power source through fuel cells. Hydrogen is refueled through hydrogen refueling machines at hydrogen refueling stations, and stored in high-pressure hydrogen cylinders. The mainstream storage pressures are divided into 35MPa and 70MPa. [0003] The current hydrogen filling process is: hydrogen is stored in the storage tank of the hydrogen refueling station at a pressure higher than that of the on-board hydrogen storage bottle. After flowing through the hydrogenation machine and the solenoid valve, it enters the on-board hydrogen storage bottl...

AI Technical Summary

Problems solved by technology

However, this design has disadvantages such as large floor area, high coolant consumption, and relatively large installation conditions, and there is no safety release pipeline in the cooling system, and there are also defects in safety performance.

Images