Research On Deflagration Risk And LOPA For LNG Receiving Stations

In recent years,global LNG production and trade have become increasingly active.LNG is new hotspot of the world’s oil and gas industry and LNG will be popular energy commodities after the oil.China pays more and more attention to the LNG industry, on the one hand, it guarantees that energy for the sustained and rapid development of economy in our country;on the other hand,the introduction of LNG can optimize the energy structure and improve environment.Now,there are 6 LNG receiving stations in China,such as dalian,fujian,guangdong,Shanghai,Jiangsu and ningbo,in addition,there are 9 LNG receiving stations which are under construction.LNG industry has entered vigorous stage of development.Liquefied natural gas(LNG) is inflammable,explosive,evaporation,rapid phase transition and low temperature. LNG leakage will quickly evaporate and become flammable vapor cloud, when it is ignited,flammable vapor cloud may explode,and it may have serious consequences.Liquefied natural gas(LNG) is high risk for LNG receiving station, under the condition of LNG leakage and chains of disaster,operational risk assessment and control strategy research are systematically studied.This papper focuses on risk assessment and risk control technology research for LNG leakage and NG deflagration in the LNG receiving station.It also provides theoretical and technical support in the operation security of LNG receiving station and accident emergency rescue.This article firstly carried out process safety accident analysis for the LNG receiving station, which included the region and the type of accident, the accident frequency, the cause of the accident,and the amount of leakage; Based on the CFD theory,LNG leakage diffusion and vapor cloud explosion were simulated for LNG receiving station, respectively studied diffusion and vapor cloud explosion impact factor. combustible gas danger scope and explosion overpressure near field were reliably forecasted, which was on the basis of the research for fire or explosion risks;Combined CFD technology and TNO Multi Energy Method,relationship between overpressure value and the distance was discussed, which the overpressure had an influence on structure;Serious consequences scene were deeply analysed by semi-quantitative layer ofprotection analysis, replaced of initial frequency and ignition probability,judging whether there is enough safety protection measures to control the risk for the dangerous scene and whether risk was the scope of tolerable.