Zero-Boil-Off system of liquid hydrogen refueling station
WANG Chenguang, 李 遠鑑, ZHANG Shurui, ZHANG Cunman, XUE Mingzhe, 朱 紹偉 （同済大）
Abstract:In liquid hydrogen (LH₂) refueling stations, unavoidable heat leakage induces hydrogen evaporation, leading to boil-off losses. To address this issue, a zero-boil-off (ZBO) system has been designed, redirecting evaporated hydrogen through dedicated pipelines to an auxiliary storage tank, where it is recondensed by a refrigerator, enabling hydrogen recovery and pressure control in safety level within the main storage tank.A thermodynamic analysis of LH₂ pumps and storage tanks and proposes strategies for reducing heat leakage was presented to minimize the condensation thermal load on refrigerators. Furthermore, it conducts a systematic investigation of the heat transfer characteristics and liquid film distribution patterns during filmwise hydrogen condensation on refrigerator cold heads under various operating conditions. How condensed liquid hydrogen return to the storage tank without tumbling was also investigated.