混合气体的临界温度计算

Calculation of the Critical Temperature of a Mixture of Gas

采用多种计算规则:无交互作用参数法、固定交互作用参数法、基于外延拓展性质法、基于基团贡献法计算含不同甲烷浓度的沼气临界温度,四种计算规则的计算结果均与文献值相近。甲烷含量在80%,依据GT和RK计算规则可得混合气体的临界温度为-55.6℃和-56.6℃。高浓度情况下,GT和RK计算规则计算值最为精确。

Used four rules of calculation:methods without interaction parameters、methods based on fitted interaction parameters、methods based on excess properties and methods based on group-contribution technique to calculate the critical temperature of methane with different methane concentration.The results shown that the calculated value of these rules were all similar to the literature value.In the case of high concentration,the calculation rules of GT and RK are the most accurate.When the methane content was 80%,according to the GT and RK rules,the critical temperature of the mixed gas was-55.6℃and-56.6℃.