Research On Technologies Of Cryo-Compressed Hydrogen Supply For Fuel Cell Trucks

Hydrogen fuel cell vehicle（HFCV）is a kind of vehicle which is powered by hydrogen and converts chemical energy of hydrogen into electric energy through fuel cell。It has advantages of zero emission,zero pollution and long driving range.But at present,the on-board hydrogen storage and supply system has many problems to be solved,including energy storage density,utilization of hydrogen,heat dissipation of fuel cells,safety,reliability and its high cost.Therefore,it is of great significance to conduct research on hydrogen storage and supply system for HFCV.The application of cryo-compressed hydrogen storage technology in heavy-duty truck is studied,including the design of a novel cryo-compressed hydrogen storage and supply system,the state change of hydrogen while releasing and its real-time control strategy.The main research work and innovation of this paper are provided as follows:（1）Based on the fluid thermodynamic model,a lumped parameter model for the release process of cryo-compressed hydrogen storage vessel was established.The numerical simulation was carried out by MATLAB to predict the changes of pressure and temperature inside the vessel while the vehicle driving.It is proved that Cc H₂ would experience changes from supercritical state,gas-liquid state,to gas state.According to the prediction,the dynamic supplementary heating scheme of vessel is designed.（2）Through dynamic and kinematic calculation,the energy conversion and transfer efficiency of whole vehicle are analyzed,and the selection basis of HFCV is explored.Combined with the vehicle thermal management system,a novel cryo-compressed hydrogen supply system with multi-stage heat exchange mode is designed.The operation principle,device composition and control mechanism are studied to realize the comprehensive utilization of‘waste heat’generated by fuel cell and‘cold energy’from cryo-compressed hydrogen.（3）The critical line of positive and negative throttling effect of hydrogen under specific pressure is explored by numerical modeling under various working conditions by MATLAB.Combined its discharge model,the real-time control strategy is discussed.Especially,the operation parameters of heat exchanger are quantitatively studied.The overall dynamic response mechanism not only meets requirements for normal operation,but also improves energy utilization of whole vehicles.