由主分馏塔和吸收稳定系统构成的分离系统内部联系比较紧密,同时系统内部存在多个操作变量,可以对这些变量进行优化调整来全面地降低系统的能耗。利用流程模拟软件UniSim Design对某石化厂160万吨/年催化裂化装置的分离系统进行稳态和动态的流程模拟。利用稳态模型,以能耗最小为优化目标,以产品质量指标为约束条件对分离系统内多个变量进行操作优化。利用动态模型作为虚拟装置,通过以质量指标作为被控变量的常规控制改变设定值的方法将优化结果予以动态实现,通过对比发现,为了平稳地实现优化结果并保证质量指标不超限,应该将优化结果分阶段实现。 The separation system composed of the main fractionator and the absorption stability system is closely related to each other, and there are several operational variables in the system. These variables can be optimally adjusted to reduce the energy consumption of the system in an all-round way. UniSim Design was used to simulate the steady state and dynamic process of the separation system of a 1,600,000 t / a FCCU in a petrochemical plant. The steady-state model is used to minimize the energy consumption as the optimization objective, and the product quality index is used as the constraint to optimize the operation of multiple variables in the separation system. Using the dynamic model as a virtual device, the optimization results are dynamically realized by changing the setpoint with the conventional control of the quality index as the controlled variable. By comparison, it is found that in order to smoothly achieve the optimization result and ensure that the quality indicator does not exceed the limit, The optimization results will be implemented in stages.