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基于扩散机理和化学动力学理论,提出了天然气水合物分解成冰和气体的动力学模型。该模型考虑了天然气水合物分解过程的本征动力学和冰层的孔隙结构。在准稳态近似框架中,动力学模型可以解析求解得到超越方程,从而简化了求解过程。在动力学模型中,分析了动力学参数对天然气水合物分解成冰和气体过程的影响。以粉末状甲烷水合物分解成冰和气体为例,在准稳态近似框架中估算了参数E_2和f的值,也得到了甲烷气体在冰层中扩散系数的约值。同时,还解释了甲烷水合物异常的自保护效应现象。此外,该模型的试用范围还需要作进一步的验证。
Based on the diffusion mechanism and chemical kinetic theory, a kinetic model of gas hydrate dissociation into ice and gas was proposed. The model takes into account the intrinsic kinetics of the gas hydrate decomposition process and the pore structure of the ice layer. In the quasi-steady-state approximation framework, the dynamics model can be solved analytically to obtain the transcendental equation, thus simplifying the solution process. In the kinetic model, the influence of kinetic parameters on the process of gas hydrate decomposition into ice and gas is analyzed. Taking the decomposition of powdered methane hydrate into ice and gas, the values of E_2 and f are estimated in the framework of quasi-steady state approximation, and the approximate value of diffusion coefficient of methane gas in ice layer is also obtained. At the same time, also explained the phenomenon of self-protection of methane hydrate abnormalities. In addition, the scope of the model trial needs further validation.