NUMERICAL CALCULATION OF THE FLAME SPREADING OVER A METHANE HYDRATE SURFACE

Authors

Otabek NigmatovFollow
Oksana Ismailova, Uzbekistan-Japan Innovation Center of YouthFollow

Abstract

The Methane Hydrate is expected as an energy source and is being as a medium distance transport means of natural gas alternative of LNG (Liquefied Natural Gas). During the natural gas transportation, fire accidents are concerned. In the present study, the flame spreading over a methane hydrate surface has been studied numerically as a function of hydrate surface temperature, T_s. When T_s = 173 K (-100℃), lower than the dissociation temperature (T_d = 183 K (-90℃)), the flame spreading speed is around 6.5 mm/s, while the flame spreading speed at T_s = 193 K (-80℃), is around 950 mm/s, which is 150 times higher than at T_s = 173 K (-100℃). This indicates that the flame spreading speed drastically changed at the dissociation temperature. These results correspond to experimental results. When T_s > T_d, the flame spreades gaseous methane/air mixture formed on the hydrate surface and then the flame spreading speed is very fast. When T_s < T_d, the flame spreads, dissociating the methane hydrate in front of the leading flame edge by the heat from the flame. Then the dissociation rate determines the flame spreading speed, and it is very slow.

Recommended Citation

Nigmatov, Otabek and Ismailova, Oksana (2024) "NUMERICAL CALCULATION OF THE FLAME SPREADING OVER A METHANE HYDRATE SURFACE," CHEMISTRY AND CHEMICAL ENGINEERING: Vol. 2023: No. 4, Article 8.
DOI: https://doi.org/10.34920/cce202348
Available at: https://cce.researchcommons.org/journal/vol2023/iss4/8