Rectifying tower liquid level-flow rate intelligent nonlinear region control method combined with expert system

Abstract

The invention discloses a rectifying tower liquid level-flow rate intelligent nonlinear region control method combined with an expert system, and belongs to the technical field of flow process industrial production. In a pressure allowable range, the set value of a flow rate controller is regulated according to the change condition of liquid level and the located region of the liquid level of therectifying tower; the located region of the liquid level of the rectifying tower is divided into a stable region, an adjustable region and an artificial interference region; the region between the upper and lower limits of the liquid level adjustable region is the stable region; the region between the upper and lower limits of the liquid level adjustable region and the liquid level high and low limits is the adjustable region; the region exceeding the liquid level high and low limits is an artificial interference region. The method has the basic design idea of regulating the set value of the flow rate controller in real time by simulating the operation of operators according to the expert knowledge experience of operators and field technicians.

Description

technical field [0001] The invention relates to a non-linear area control method for a liquid level-flow control loop of a rectification tower in a petrochemical plant process. Background technique [0002] In large-scale petrochemical plants, with the gradual improvement of the modernization, automation and integration level of the plant, the relationship between the equipment is getting closer and closer, and the upstream and downstream processes have a continuous production relationship. Due to the continuity of operation, often the previous equipment The output of the equipment is directly used as the feed of the latter equipment. For some equipment, such as rectification towers, in order to maintain the stability of its production, it is required that the amount of materials sent to these equipment should be changed slowly or not. However, the former The equipment also requires smooth operation, which makes it difficult to ensure the feeding requirements of subsequent e...

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Problems solved by technology

[0003] In order to solve the liquid level-flow control problem, the present invention proposes a kind of non-linear area control method, this method combines expert system and non-linear area control idea, aiming at the process characteristic of continuous production between rectification towers in the chemical production process industry, the tower Liquid Level-Flow Implementation of an Intelligent Nonlinear Area Control

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