关键词: 过程装置, 健康评估, 控制回路, 控制阀非线性故障, 故障源定位, 氯乙烯装置

Abstract: Aiming at the subhealthy of large in-service chemical process equipment,a method of healthy quantitative evaluation and fault source diagnosis for large process equipment systems was proposed based on practical operation process parameters and their inherent relationship analysis.The performances of control loop were evaluated by using minimum variance control,and performance of control valves were assessed by using bicoherence-based nonlinearity measures so as to realize healthy quantitative evaluation for equipment.Fault separation and oscillatory source localization were evaluated by special independent component analysis,and oscillation propagation analysis was defined based on Granger causality test.The theories and methods were introduced and used to evaluate a large-scale vinyl chloride production plant.The results of quantitative evaluation for the plant loop were obtained,and the oscillation disturbance and propagation were determined.The field survey demonstrated that the results could reflect practical situations of the plant.

Key words: process equipment, health evaluation, control loop, nonlinearity measures for control valve, fault source localization, vinyl chloride production plant