A description is made of the structural characteristics of the new-type U-tube heat exchanger, and an introduction is given to its use in the crude methanol system.

阐述了新型U形管换热器的结构特点，介绍了该种换热器在粗甲醇系统中的应用情况。

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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.

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。

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A new U-shaped heat exchanger is presented, and its structural characteristics are discussed. The U-shaped heat exchangers are used in the industrial crude methanol system.

阐述了新型U形管换热器的结构特点，介绍了该种换热器在粗甲醇系统的应用情况。

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