冰转化为水合物的收缩核反应动力学模型  

Unreacted core shrinking model for gas hydrate conversed from ice

作　　者：郑平友[1] 王胜杰[1] 沈建东[1] 何小霞[1] 刘芙蓉[1] 

机构地区：[1]西安交通大学能源与动力工程学院

出　　处：《化学工程》2005年第4期26-29,共4页Chemical Engineering(China)

基　　金：国家自然科学基金项目(40272064)

摘　　要：冰转化为水合物是一个有产物层生成的气固反应过程,整个反应过程由气体反应物的外扩散、产物层内扩散以及在冰和水合物界面发生的化学反应组成。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。给出了该模型的数值求解方法,求解结果与文献数据相吻合。The hydrate formation from ice is considered as a gas-solid reaction process and the process is consisted of external diffusion of gas reactant and internal diffusion of the product layer as well as interfacial reaction between hydrate and ice. 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. The solving method of the model was submitted. The results coincide with the experimental records well.

关 键 词：气体水合物 缩核反应动力学 冰 符号函数 

分 类 号：O643.1[理学—物理化学]