苏联国家石油炼厂设计院设计的一套处理重油的热裂化装置,在1951年投入了生产,几年来,由于操作方法的改进,使装置的处理量有了显著的提高,到1957年比原設計能力提高了75％。裂化深度也遂步提高,这可从裂化渣油的比重不断增加看出,1955年裂 A set of thermal cracking units for heavy oil designed by the Design Institute of the Soviet Union National Petroleum Refinery put into production in 1951. In the past few years, due to the improvement of operation methods, the unit capacity has been significantly increased. By 1957, Design capacity increased by 75%. Cracking depth also increased step by step, which can be seen from the increasing proportion of cracked residual oil, cracked in 1955