Extractive rectification process control method based on effective relative gain matrix method

Abstract

The invention discloses an extractive rectification process control method based on an effective relative gain matrix method. The extractive rectification process control method based on the effective relative gain matrix method comprises the steps that control variables and controlled variables are selected according to the separation requirements; step disturbance is exerted on each control variable, so that an open-loop step response curve of the controlled variables is obtained, and a transfer function matrix of the dynamic process is obtained by fitting the response curve; the effective relative gain matrix of the transfer function matrix is obtained; a mating pair of control variable and controlled variable capable of minimizing the mutual interference between all control loops is obtained through an effective relative gain matrix according to the pairing criterion; a control scheme and the parameter of a controller are designed according the optimal mating pair of control variable and controlled variable; the extractive rectification process is controlled according to the control scheme and the parameter of the controller. The extractive rectification process control method based on the effective relative gain matrix method has the advantages that the interference between all the loops is small, the stability of the process can be maintained more effectively, and the qualified rate of products can be maintained more effectively.

Description

technical field [0001] The invention belongs to the technical field of separation process dynamic control, and in particular relates to an extraction and rectification process control method based on an effective relative gain matrix method. Background technique [0002] In the actual production of the extractive distillation process in the prior art, multi-input multi-output extractive distillation is often used for product separation or waste liquid treatment, and changes in input and output during the multi-input multi-output separation process will interfere with the steady state of the system , small changes in input and output in production cannot be eliminated, so the effectiveness of the dynamic control scheme has become an important factor for stable production of the process. [0003] At present, the luyben method is mostly used to control the extraction and rectification process. The control method of the luyben method can effectively control external disturbances...

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Problems solved by technology

[0002] In the actual production of the extractive distillation process in the prior art, multi-input multi-output extractive distillation is often used for product separation or waste liquid treatment, and the change of input and output during the multi-input multi-output separation process will interfere with the steady state of the system , small changes in input and output in production cannot be eliminated, so the effectiveness of the dynamic control scheme has become an important factor for stable production of the process

[0003] At present, the luyben method is often used to control the extraction and distillation process. The control method of the luyben method can effectively control external disturbances. The steady state re-reached after being affected by a small external disturbance, which seriously deviates from the initial set state

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