Emergency Evacuation Scheme Research For Compressed Natural Gas Station Accident

Because the growing shortage of petrol resources and national energy strategy adjustment accompany with the environmental requirements and continues development of vehicle technology, gas vehicles was highly increased. Correspondingly the number of compress natural gas (CNG) stations becomes more and more. However, as the consequence the spate of CNG station accidents as leakage and explosion make the using security as a serious problem which getting more and more attention among the administration, stations operator, drivers and even the residents around the CNG stations. Thus, how to avoid accident and what should people do if the accident happened to reduce the lost? And what kind of emergency traffic evacuation scheme is useful for preventing the occurrence of traffic congestion even traffic damage as far as possible. All these questions have significant realistic meaning and become the focus. All of that remind us it is very important to research the evacuation scheme based on the characteristics of emergency accident itself.Firstly, the basic conception, classification and routine security measures of CNG station were discussed in this paper also the security standards of design, facilities, requirements and management measures in CNG station were analyzed. According to specific example, security structure and operation mode of CNG station were introduced. Secondly, we make a statistics of CNG station accidents and mainly classify them into three types: combustion, explosion and leakage. And further introduce the main damage of every type of accident. Focus on the gas cloud explosion accident which is the commonest accident type and may bring a great lost the"explosion borders"were calculated: death radius, serious injury radius, minor injury radius and safety radius which were based on the different damage level and makes the CNG station accidents became more concrete and concise. This paper also introduces the principle of emergency traffic, divides the emergency evacuation into two parts: alertable emergency evacuation and un-alertable emergency evacuation. Three traffic evacuation measures were introduced: staged evacuation,contraflow and intersection evacuation scheme. Based on the"national master plan for responding to public emergencies"we classify the accidents into four different levels. Consequently, four different evacuation schemes were got. They were: pedestrian evacuation,alert evacuation,forbidden evacuation and mandatory evacuation. Finally, we taking the Xibei Bridge CNG station as a real model of the accident and making traffic simulation with the help of VISSIM and TransCAD to proof the rationality and maneuverability of that four evacuation schemes...