The dynamic response of benzene alkylation process to a set of deviations is analyzed with Aspen Plus Dynamics. A quantitative risk assessment is developed through simulations of deviation scenarios. The process comprises a reactor and three distillation columns with a recycle stream. The simulation scenarios are determined according to lessons learnt from accidents. This study underlines the conditions that induce an overpressure or a flooding in a distillation column. Three scenarios are proposed: feed flowrate variations, coolant flowrate reduction and cooling of the reboiler steam. Thereafter, the results allow calculating a set of risk indexes related to flooding and overpressure phenomena. This study underlines the deviation propagation effects that can be expected in all the process equipment. Moreover, it represents a significant contribution to the definition of the process control strategy and the necessary safety barriers.

使用Aspen Plus Dynamics分析了苯烷基化过程对一组偏差的动态响应。通过对偏离情景的模拟来开发定量风险评估。该方法包括反应器和三个具有再循环料流的蒸馏塔。根据从事故中汲取的经验教训确定模拟方案。这项研究强调了在蒸馏塔中引起超压或溢流的条件。提出了三种方案：进料流量变化，冷却剂流量降低和再沸器蒸汽冷却。此后，结果允许计算与洪水和超压现象有关的一组风险指标。这项研究强调了在所有过程设备中可以预期的偏差传播效应。而且，