Abstract:

With the development of hydrogen-methane-mixture, mixed gas explosion accidents have gradually attracted attention. To reduce the loss and influence caused by mixed gas explosion accidents, this study integrated research results at home and abroad through literature review. The experimental data and numerical simulation analysis results were comprehensively sorted out. The research progress at home and overseas on the influence of initial temperature, initial pressure, gas composition, test vessel and ignition conditions on the explosion limit and explosion pressure of mixed gas was discussed. The results show that the initial temperature and initial pressure have a significant effect on the explosion limit of the mixed gas, and the coupling effect of the two is greater. The upper and lower explosion limits of the mixed gas exhibit different sensitivities to the influencing factors, with the upper limit being more significantly affected. The maximum explosion pressure of the mixed gas generally appears when it is slightly higher than the theoretical stoichiometric concentration, and the influencing factors are complex and diverse. Among these factors, the maximum explosion pressure is greatly affected by the composition of the mixed gas. The addition of combustible gases such as hydrogen and ethylene will increase the explosion pressure of major gases such as methane. Numerical simulation technology can provide an important supplement and verification for the study of explosion limit and explosion pressure of mixed gas.

Key words: mixed gas, explosion limit, lower explosive limit, upper explosive limit, explosion pressure, numerical simulation