Fault diagnosis method for catalyzing and cracking main fractionator based on double-layer method

The invention discloses a fault diagnosis method for catalyzing and cracking a main fractionator based on a double-layer method. A double-layer fault detection and diagnosis scheme for a rectificationprocess of the fractionator is provided, the rectification process is monitored by using a non-linear model which is developed at the early stage, a corresponding simplified linear model is established, and an abnormal source a measurement value of which has deviation is identified. According to a fault diagnosis algorithm, based on the linear model, a linear least square method is adopted for estimating fault parameters in rectification. A double-layer diagnosis structure can effectively capture the change of the fault parameters, the deviation is sensitively detected, the specific reason offaults can be judged from the change trend of the parameters, and the structure is more effective under comparison with a structure based on a pure non-linear model. 本发明公开了种基于双层法的催化裂化主分馏塔的故障诊断方法。本发明提出了分馏塔精馏过程的双层故障检测和诊断方案，利用早期