The approximate calculation of Joule?Thomson coefficient is analyzed. The production reasons of hydrate and icing cram when compressed natural gas is throttled in winter and eliminating methods are discussed.

• 分析了焦耳-汤姆逊系数的近似计算,讨论了冬季压缩天然气减压后在管道内产生水化物和冰堵的原因和消除方法。