Active-disturbance-rejection control method for temperature of a constant stirring polypropylene reaction kettle

Abstract

The invention discloses an active-disturbance-rejection control method for the temperature of a constant stirring polypropylene reaction kettle. A discrete mode is adopted for the active-disturbance-rejection control method for the temperature of the constant stirring polypropylene reaction kettle, and a tracking differentiator module, an expanded state observer module and a non-linearity feedback controller module are involved. The method includes the steps that firstly, parameters of the tracking differentiator module and the expanded state observer module are set; then, a transient process is arranged, and disturbances are estimated; finally, an error signal is used for adjusting the non-linearity feedback controller module to control the temperature of the polypropylene reaction kettle. The control method has the advantages that the method is implemented on SIMATICPCS7 equipment without establishing a constant stirring polypropylene reaction kettle model, the dynamic response is rapid, and a system is high in adaptability and robustness under the working conditions of disturbances and variable loads.

Description

technical field [0001] The invention relates to an automatic disturbance rejection control method for the temperature of a continuously stirred polypropylene reactor, which belongs to the field of process control of chemical production. Background technique [0002] The industrial polypropylene reaction is an important batch production process, and its process technology is complex, with characteristics such as large lag, time variation and uncertainty. Polypropylene production is carried out in the industrially common stirred reactor (CSTR), which is a continuous polymerization process. The production requires that the reactants propylene and ethane undergo a polymerization reaction at a temperature of 70±1.0°C under the action of a catalyst to obtain a polypropylene product that meets the process requirements. [0003] Due to the strong stirring of the continuous stirring reactor, the solvent ethane plays a good role in dispersing and diluting, so the material flow state ...

AI Technical Summary

Problems solved by technology

However, these methods all need to know the precise mathematical model of the system, and the mechanism modeling method involves a series of problems such as material balance, energy conservation and chemical reaction process. It is difficult to obtain a specific model in practice, and its practicability is greatly limited.

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