Simulation of the Combustion Process of Methane Hydrate Taking into Account Incomplete Evaporation of Released Water during Its Dissociation

A mathematical model of the combustion process of methane hydrate in a closed volume is presented, taking into account the kinetics of its decomposition (nonequilibrium), as well as absorption of thermal radiation energy. Based on the numerical solution by the large particle method, the distributions of the main parameters of the system were constructed. The authors compare the specific features of hydrate combustion for cases corresponding to different values of the fraction of evaporated water released during hydrate dissociation. It is shown that partial evaporation of water formed during decomposition of the hydrate leads to an increase in the combustion temperature of the gas mixture and to more intense decomposition of the hydrate compared to the case of complete evaporation of all released water. The dependences of the flame temperature, the maximum pressure of the gas mixture, and the law of motion of the phase transition front on the degree of evaporation of the released water are constructed and analyzed.