| The main danger of hazardous chemicals with explosive characteristics is the strong damaging effect on the carrier during the process of combustion and explosion.In recent years,explosion accidents of such hazardous chemicals have occurred frequently,and China,as one of the countries that produce and use explosive explosion hazardous chemicals,should pay attention to the combustion characteristics of such hazardous chemicals.However,most of the explosive explosives are in liquid or solid phase.It is impossible to accurately estimate its combustion characteristics based on the existing combustion model due to the change of the phase state.This paper intends to construct a multi-component gas-phase detailed mechanism substitution model that can overcome the effects of phase states and achieve the predicted combustion characteristics of explosive chemicals.Moreover,the current model of the prediction of the consequences of a combustion accident lacks consideration of microscopic elementary reactions.Therefore,in this paper,the azo compounds also have been taken as an example to construct a model of the prediction of the consequences of a combustion accident from the perspective of microscopic elementary reactions.Firstly,the research in this paper is based on the law that the macroscopic combustion characteristics of gaseous fuels depend on their intermediate cracking products.Therefore,the intermediate products of high-temperature cracking of typical liquid-phase hydrocarbon compounds and solid-phase nitramine compounds were also investigated.At the same time,the concept of ignition contribution was introduced,and a multi-component gas-phase detailed mechanism substitution model for liquid-phase hydrocarbon compounds and solid-phase nitrosamine elemental compounds was initially constructed.Secondly,the numerical simulation prediction of the combustion characteristics parameters of n-heptane,n-octane and n-decane based on the preliminary established multi-component gas-phase detailed mechanism substitution model were carried out.The simulation results are compared with the experimental data under the same thermodynamic conditions,the data obtained from the numerical simulation based on the mature detailed mechanism of liquid hydrocarbons.On the premise of verifying the validity of the multi-component alternative fuel model constructed in this paper,it is also concluded that the gas-phase hydrocarbon alternative fuels of liquid-phase hydrocarbon compounds can be composed of small-molecule gas-phase hydrocarbon compounds with higher apparent enthalpy within C3.Then,a combined general formula for solid-phase nitramine mixtures was constructed based on the common mixing rule of typical solid-phase nitramine compounds,to estimate its multi-component gas-phase detailed mechanism substitution model.Combined with the study of the optimal alternative fuel combination rules for liquid-phase hydrocarbon compounds and the high-temperature cracking intermediate products of typical solid-phase nitramine compounds,the gas-phase alternative fuel combinations for RDX,RDX / GAP and RDX /GAP / HTTP were screened out,and their combustion characteristics parameters are estimated using numerical simulation.Through a comparative study with experimental data,it is concluded that the multi-component gas-phase detailed mechanism substitution model can effectively predict the combustion behavior of typical solid-phase nitramine hazardous chemicals.Finally,the multi-component gas-phase detailed substitution model was used to simulate and predict the combustion characteristics of typical azo compounds,and then the entropy weight method and the TOPSIS method were used to construct a combustion accident consequence model for them. |
