Objective The aim is to solve the problems of high energy consumption and unreasonable product structure in atmospheric and vacuum distillation unit of a petrochemical refinery.Methods The energy saving and optimization reforms of the unit were carried out through optimization of the heat exchange network,optimization of equipment operating parameters,improvement of the waste heat recovery rate of the heating furnace,improvement of the processing capacity of the plant,and replacement of high-efficiency tower separation elements.Results After the completion of the reformation,the energy consumption of the plant was reduced by 1.23 kg of standard oil/ton of crude oil,and the yields of high value-added jet fuel components and lubricant hydrotreating and reforming materials were increased by 2.3％in total,with a comprehensive efficiency of 66 million RMB per year.Conclusions Adopting plate heat exchanger and combined air preheater,optimizing the distribution ratio and sequence of heat recovery load in the middle section,and adjusting the steam production and consumption of the unit have been proven to be effective measures for energy saving.The application of CTST three-dimensional mass transfer tray and structured packing with high efficiency and low pressure drop has been shown to solve the problem of unreasonable product structure.
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