## 3 Results and Discussion  
Gas hydrate combustion involves a certain group of processes, namely, dissociation, gas release, the formation of a water film on the hydrate surface, its evaporation, the diffusion of gas inside the hydrate, self-preservation, the formation of a gas-vapor mixture and its oxidation, and the release of additional energy in the gas phase, thus contributing to the heating of deep layers of the sample and burnout of the whole gas volume. A variety of factors affects the combustion behavior of methane hydrate. These include ambient temperature, the size and density of the pores within the hydrate, the characteristics of the oncoming oxidizer gas flow, the size and uniformity of the gas hydrates, their shape, phase transformations, etc. This research establishes the role of a group of factors when determining the key process characteristics (ignition delay times of gas hydrate). The adequacy of the developed model was preliminarily evaluated by comparing the calculated ignition delay times with known experimental data. Figure 2 presents the corresponding comparison results that demonstrate a satisfactory correlation between  
\begin{table}
\begin{tabular}{l c c c} \hline \hline
**Constant** & **Designation** & **Value** & **Measuring Unit** \\ \hline Activation energy of oxidation reaction of fuel vapors & \(E_{\text{a}}\) & \(190\times 10^{3}\) & J/mol \\ \hline Pre-exponential factor of oxidation reaction of fuel vapors & \(k_{0}\) & \(7.4\times 10^{8}\) & s\({}^{-1}\) \\ \hline Thermal effect of oxidation reaction & \(Q_{r}\) & \(14.644\times 10^{6}\) & J/kg \\ \hline Heat of water evaporation & \(Q_{\text{evap}}\) & \(2.2\times 10^{6}\) & J/kg \\ \hline Heat of ice melting & \(Q_{\text{melt}}\) & \(3.4\times 10^{5}\) & J/kg \\ \hline Mass rate of gas hydrate dissociation & \(w_{\text{d}}\) & \(0.01\) & kg/(m\({}^{2}\cdot\)s) \\ \hline Heat of gas hydrate dissociation & \(Q_{\text{d}}\) & \(108\times 10^{3}\) & J/mol \\ \hline Mass rate of ice melting & \(w_{\text{melt}}\) & \(0.01\) & kg/(m\({}^{2}\cdot\)s) \\ \hline Mass rate of water evaporation & \(w_{\text{evap}}\) & \(0.01\) & kg/(m\({}^{2}\cdot\)s) \\ \hline External medium (heating source) temperature & \(T\) & \(973\text{--}1273\) & K \\ \hline Initial temperature of gas hydrate & \(T_{\text{g}}\) & \(203\) & K \\ \hline Air flow rate & \(U_{\text{a}}\) & \(1\) & m/s \\ \hline Hydrate structure porosity & \(\varphi\) & \(0.05\) & – \\ \hline Thermal conductivity coefficient of gas hydrate & \(\lambda\) & \(1.33\) & W/(m\(\cdot\)K) \\ \hline Gas hydrate density & \(\rho\) & \(909\) & kg/m\({}^{2}\) \\ \hline Specific heat capacity of gas hydrate & \(C\) & \(2200\) & J/(kg\(\cdot\)K) \\ \hline \hline \end{tabular}
\end{table}
Table 1: The thermokinetic constants for modeling the processes of heating, evaporation, and ignition of methane-propane hydrate.  
the experimental and modeling values. Taking the experimental data dispersion and assumptions made in the mathematical modeling into account, the resulting discrepancy between the experimental and theoretical ignition delay times can be considered as rather low. Therefore, the model can be considered as adequate.