Coking at the inlet of large gas line to fractionator has been effectively prevented by setting up steam circle pipes under appropriate operation conditions.

控制合适的操作条件，在大油气管线进分馏塔入口处增加蒸汽环管，可以有效防止结焦。

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It confirms that tempering quality after being circle checked is the main cause for deformation of the steam seal ring made by rolling.

通过分析，确认校圆后的回火质量是钢板卷制汽封圈产生变形的主要原因。

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This paper put forward some measure as setting up steam gas combined circle in connection with fully gas in rendering enterprises. They are useful in reducing prime cost and raising efficiency.

针对炼油企业瓦斯量较多，提出了建立燃气-蒸汽联合循环措施，对降低成本、提高效率有较大作用。

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