Scheme Design And Risk Assessment Of Fuel Cell System For Hydrogen Powered Ferry

With the enhancement of global environmental awareness and the popularization of sustainable development concept,governments and shipping giants all over the world have begun to gradually promote the development of green shipping and take effective measures to promote green ship technology innovation.Among them,hydrogen fuel cell has a very broad application prospect,because of its zero emission,high efficiency,energy saving and low noise and other advantages,has been widely paid attention to in the field of Marine traffic.Although the use of hydrogen fuel cell power is in line with the international community’s demand for environmental protection,the current stage of hydrogen fuel cell technology is not mature,hydrogen fuel has inflammable and explosive dangerous characteristics,if the improper treatment of hydrogen fuel leakage is likely to cause fire and explosion accidents.Therefore,it is very important to carry out risk assessment research for hydrogen fuel cell powered ships.Through control measures,risks can be gradually reduced and the anti-risk ability can be continuously improved in engineering practice.According to the needs of the project,this paper carries out the project design and risk assessment of a hydrogen fuel cell powered ferry which is planned to sail between islands in Zhoushan.Based on the relevant safety regulations and design principles,the power demand and commercial use of the reference ship type are analyzed,and the design scheme of the hydrogen fuel cell power system is put forward.At the same time,based on the comprehensive safety assessment method,the risk qualitative analysis is carried out from the fuel filling process and ship navigation process,the probability of accident is calculated,and finally the risk control measures are proposed.The main research work of this paper is as follows:(1)This paper discusses the theories related to risk assessment methods,the current specifications and standards related to Marine hydrogen fuel cells and the study of accident consequence models,which provides a theoretical basis for the subsequent program design and risk assessment research.(2)Based on relevant safety specifications and design principles,the prototype ship was powered by a design plan from the aspects of fuel cell power system,hydrogen storage system,fuel supply system and safety system.(3)Carry out risk identification in the fuel filling process of hydrogen fuel cell powered ferry,respecti · vely construct accident trees based on comprehensive safety assessment method,carry out qualitative analysis combined with accident trees,explore the influencing factors leading to accidents,and calculate the diffusion distance,influence range of thermal radiation and influence range of explosion shock wave under the most dangerous conditions.(4)Carry out risk identification in the sailing process of hydrogen fuel cell powered ferry.Through the construction of accident tree and qualitative risk analysis,it can be seen that collision extrusion is a risk point with a high degree of danger.Conduct collision simulation research on the possible impact of ship collision on fuel cell cabinet and hydrogen storage tank.(5)Summarize the qualitative analysis results of hydrogen fuel cell powered ferry,calculate the occurrence probability of each basic event to determine the occurrence probability of top event,and finally put forward reasonable risk control measures as a reference basis.