对乙烯装置前脱丙烷前加氢流程中的C_3加氢单元存在的必要性作了探讨。
The necessity of C_3 hydrogenation unit existence in front depropanizer front hydrogenation flow of ethylene plant is studied and fully discussed.
在上海炼油厂预加氢反应器投用前的内外部检验中，发现了大量的焊缝表面裂纹和内部埋藏裂纹。
On overall inspection of interior and exterior of pre-hydrogenating reactor of Shanghai Oil Refinery Factory, large cracks was found on the surface of weld and inside of the weld.
对焦化柴油进行加氢精制前化学精制处理，可使焦化柴油中的胶质、氧化总不溶物、烯烃等含量大幅度降低。
The each content of gum, total oxidation insoluble matters and olefins, etc, is decreased significantly by chemical treatment of coker diesel oil before hydro-refining.
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