中文摘要：

由于沼气的主要成分为甲烷、二氧化碳和硫化氢，在相同的温度条件下它们在纯水中形成水合物时压力有很大的差别，因此可利用气体水合物法将沼气分离净化，获得高纯度甲烷气。本文通过建立的气体水合物形成新模型模拟计算了（CH4＋CO2＋H2S）三元酸性气体水合物的形成条件，计算值与黄强等人的实验值吻合很好，这说明建立的新模型是比较可靠的。用新模型对实际沼气成分的6组样品在形成水合物时的条件进行了模拟计算。上述研究对从沼气分离出高纯甲烷气具有极为重要的意义。

英文摘要：

The main compositions of the biogas are methane, carbon dioxide and hydrogen sulfide. There are great differences in hydrate formation pressures among the methane, carbon dioxide and hydrogen sulfide in pure water, therefore high purity methane can be separated from biogas through the method of gas hydrate formation. Hydrate formation conditions of biogas （ CH4 ＋ CO2 ＋ H2S） , the ternary sour gases, were simulated by a new gas hydrate model. The simulated results obtained from the model meet the Huang Qiang＇s experimental results very well. That means it is reliable that the model can be used to calculate the hydrate formation parameters. Six groups of biogas sample were calculated by the model at relevant hydrate formation conditions, and the results matched the actual biogas composition. The research is valuable for separating methane from biogas.