Abstract: The existing atmospheric and vacuum unit of a refinery was simulated and analyzed, and the problems were found to be unsatisfactory total production, unequal pressure drop of heat exchange branches and heat exchange end temperature lower than design value. The model of the unit was set up with Aspen Plus software. By using intelligent graphical method, the effect of draw rate rate on product quality was investigated and optimized. The total production of the retrofit design was increased by 3.8%. Hydrodynamic rating of columns was performed. Based on simulation results, the cold and hot stream data were extracted for heat exchanger network synthesis, analysis and optimization with the intelligent graphical method by using the HENS software. The heat exchanger network end temperature of the retrofit design was increased to 288 ℃, 18 ℃ higher than exiting value. Five new exchangers with 1825 m2 were added in the retrofit. Compared with the primary network, the structure was modified only insignificantly.

摘要： 对某一炼油厂的常减压装置的模拟和分析，发现现有常减压总拔过低，换热网络上下平台设备和管路压降相差较大，换后终温低于设计值。用Aspen Plus软件对常减压装置建立模型，采用敏感度分析方法，考察采出量对各线产品质量的影响，对常减压塔各个采出进行调优，使总拔出率达提高了3.8%，并进行了水力学核算。从模拟结果提取出冷热物料数据，采用HENS软件，利用智能图表法对现有换热网络系统进行合成、分析和优化，使换后温度提高了18 ℃，达到288 ℃，新增5台换热器，面积1825 m2，和原有换热网络相比，结构改动较小。