中文摘要：

为进一步认识炼化系统扰动及故障情况下系统行为,使用系统动力学（SD）方法分析炼化系统的故障行为。以典型炼化系统的常减压蒸馏装置为研究对象,建立其SD模型存量流量图,并对系统的异常行为进行模拟仿真分析,进一步建立故障推理方法,对炼化系统出现的异常事件进行故障根原因诊断。结果表明：由于自控系统的存在,扰动及故障逆着工艺的方向传播,它们对系统的影响逐渐衰减,在扰动和故障同时出现且影响同方向叠加的情况下,自控系统则无法保持系统的稳定运行。

英文摘要：

In order to get a deeper understanding of petrochemical units system behavior under disturb- ance and fault condition, a SD model was built for typical petrochemical units - - atmospheric and vacuum distillation crude unit, and with the model a simulation was proceeded. Based on previous study, a fault reasoning method was worked out for root cause diagnosis of abnormal situation in petrochemical units system. The results show that due to presence of an automation control system, both disturbance and fault propagate agaist the technological process flow, lhe effects of them on petrochemical system are decaying, and that automation control system cannot keep the atmospheric and vacuum distillation units running smoothly and safely. When both disturbance and fault exist simultaneously and their impacts are superposed in the same direction.