| Being one of the most convenient, safe and saving way to understandthe real process, process simulation technology is widely used for thedevelopment of new technology, engineering design and operatingdiagnosis. It can help us to determine a device from the perspective ofthe whole system and to improve the working efficiency anddecision-making.Atmospheric and vacuum distillation unit is the first refineryprocesses of crude oil. It is known as the leading unit of refiningcompany and is very important for petrochemical business.The increaseof the pull rate can improve the benefits for the company effectively.Therefore, to optimize and simulate the operation of atmospheric andvacuum distillation unit by process simulation technology can improvethe economic efficiency of production. It has increasingly attrackeddomestic and international attention. In this paper, the crude oi1distillation unit with the output8million tons/year in LuoyangPetrochemical Engineering Corporation was simulated by processsimulation software PRO/II and Aspen Pinch.Some work has been done asfollows:The crude oil was cut to a certain number of virtual components bythe true boiling point distillation data. The actual problems of the unitwere analysed. According to the products demands of atmospheric andvacuum distillation unit, the initial boiling tower, the crudedistillation and vacuum tower were simulated and the process parameterswere found for each tower.It can provide the foundation data for theprocess of optimization.The actual heat exchanger network of atmospheric and vacuumdistillation unit was analysed by the Pinch Analysis method. Thefinal theoretical heat transfer temperature of the topped crude oil canbe obtained to be318.5℃. The bottleneck of the process can be foundby the diagnoses for the existing network. It can provide the foundationdata for the heat exchanger network optimization.According to the above results and the principle of the least improvement, the heat exchangers network was optimized. After theimprovements，the final heat transfer temperature of the topped crudeoil was increased16.4℃from298.6℃to315℃.The final heat transfertemperature of the west light oil was increased102.5℃from117.5℃to220℃. The heat load of atmospheric pressure furnace was lowered.It canreduce the unit energy consumption1.75kg standard oil every ton crudeoil totally, which means converting into economic efficiency of41.0294million yuan every year. |
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