On the basis of analyzing the control step for ice conversing to hydrate and introducing the sign function, the unreacted core shrinking model for hydrate formation was proposed.

• 在对冰转化为水合物控制步骤分析的基础上,引入符号函数并提出一个改进的未反应核收缩模型来描述冰转化为水合物的动力学。