通过常压重油加氢处理或减压渣油加氢处理工艺将劣质的常压重油或减压渣油加工成适用于重油催化裂化装置的原料油，从而最大限度地获得更多的轻质燃料油。

Through hydrotreating, the poor-quality long residue or short residue from CDU can be up-graded in-to good feedstock for heavy oil FCCU. Therefore, the production of light fuel oil can be maximized.

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