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分析了浮头式列管换热器的故障现象及产生原因，提出改造方案，并根据改造后的实际情况将脱苯塔和贫富油换热器部分的贫油工艺进行了合理改进。
The reasonable improvement of the lean oil technics in crude benzene tower and heat exchanger of lean and fat oil is introduced according to the practical conditions after reconstruction.
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