Optimization and control method of rectification column

Abstract

The invention discloses an optimization and control method of a rectification column. In the method, a rectification column is controlled according to a material balance relationship and a component balance relationship by adopting a ratio of light products to heavy products of the rectification column as a main controlled variable; a feedforward compensation strategy aiming at changes of feed components is used; the feed component perturbance inhibition effect of a predictive controller of the rectification column is improved; and a steady-state optimization method based on a piecewise linear model and a dynamic-state feedback qualified optimization method based on a dynamic-state prediction model are used. On the premise that the product quality is guaranteed to be qualified, the optimization of multiple targets of qualified quality of high-value products, highest yield of the high-value products, and lowest comprehensive energy consumption of the rectification column is realized, and the operational comprehensive production benefits of the rectification column are increased.

Description

technical field [0001] The invention relates to the field of automatic control of the production process of a rectification tower, in particular to an optimal control method for a rectification tower. Background technique [0002] In the chemical process of petroleum refining, almost every device involves the liquid-liquid separation process, and the rectification column is the main process unit to realize the liquid-liquid separation of miscible substances. [0003] Due to the wide range of applications of the rectification tower, the control and optimization of the rectification tower is of great significance. Through the control and optimization of the rectification tower, it can operate stably, improve the qualified rate of products, reduce the loss of high-value components in low-value products, save energy and reduce consumption, and reduce the heat load of the reboiler. Therefore, the control and optimization of the rectification column has higher economic benefits. ...

AI Technical Summary

Problems solved by technology

However, in the case of a short laboratory test period or the use of online analyzers, since it is necessary to wait for the product quality to be basically stable before the optimization solution can be performed, a large amount of analytical data information cannot be used, and the potential of optimal control cannot be fully tapped

Between two operation optimization runs, on the one hand, when the feed composition changes, even if the feed composition data information has been collected, the predictive control still operates according to the original light-to-heavy product ratio control target, and the process operation is no longer at the optimum. On the other hand, when the product quality changes or even exceeds the limit and the product is unqualified, even if the product quality exceeds the limit information has been collected, the predictive control will not make any adjustments

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