The Investigation Of The Spread And Burning Of LNG Spills On Water

Analysis of the spillage of LNG,evaporation and spreading of LNG pool,vapor dispersion were the basis for the consequences assessment of liquefied natural gas(LNG)pool fire and vapor cloud explosion.In this paper,the evaporation rate of LNG pool was investigated,and the comparative analysis on the calculation of LNG evaporation model,FLACS,a computational fluid dynamics(CFD)software,and ALOHA,a emergency response estimates software of hazards,was carried out.The dynamic process of LNG pool spreading on water was discussed.The consequence of pool spread and pool fire hazards were estimated by using Fay model,FERC model,FLACS and ALOHA.The dispersion of LNG vapor under different spillage condition was investigated.The results showed that the evaporation rate simulated by the three models was increasing rapidly in the initial stage,then the evaporation rate calculated by the evaporation model and ALOHA was constant,and the evaporation rate simulated by FLACS was descreased.Under the same leakage condition,the dynamic processes of LNG pool spreading and pool fire spreading on water simulated by Fay model,FERC model and FLACS was similar.Generally,the maximum pool radius and the maximum heat flux calculated by the Fay model,FERC model and FLACS decrease in turn.The concentration of methane simulated by FLACS was largest,and the results of theoretical model were between the results of FLACS and ALOHA when release rate was constant.Based on these analysis results,the program of LNG spillage consequence assessment was established by combining LNG spillage model,evaporation model,vapor dispersion model and thermal radiation model.This program may provide theoretical basis for the evaluation of safety or consequences of LNG spillage accidents.