The hydrogen refueling station that is jointly built with petrol station,natural gas filling station,charging station,etc.is called a hydrogen refueling co-located station.The advantages of hydrogen refueling co-located station include solving land occupation,reducing the cost of station construction and operation,and enhancing market competitiveness.Among them,natural gas-hydrogen co-built stations face numerous safety problems during operation due to the flammable and leak-prone characteristics of the natural gas and hydrogen stored in the station,making it important to conduct a safety risk evaluation study of natural gas-hydrogen co-built station fires and explosions.Using the fishbone diagram analysis method,the study identifies the hazard sources of natural gas-hydrogen co-built stations from the perspectives of materials,facilities and equipment,and personnel factors.The study establishes a fault tree model with"natural gas-hydrogen co-built station fire and explosion"as the top event,and through the calculation of the minimum cut set,minimum branch set,and structural importance,the study ranks the basic events that lead to the top event and determines the critical basic events.The study then proposes safety measures for natural gas-hydrogen co-built station fires and explosions to ensure safe and long-term operation of the station.The research findings show that:(1)After adding hydrogen refueling equipment to the existing conventional natural gas filling station,the risk factors become more variable and complex;(2)There are many potential pathways that can lead to natural gas-hydrogen co-built station fires and explosions,while the pathways that limit the occurrence of accidents are relatively few,and the risk of gas-hydrogen co-built station fires and explosions is high.(3)Safety measures should be taken from four aspects,including ventilation system,on-site protection devices,ignition sources,and gas leaks,to ensure the safe operation of a natural gas-hydrogen co-located station.
natural gas and hydrogen joint construction stationfish bone mapfault tree analysishazard identificationsafety measuresrisk assessment
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