The application of Advanced Process Control System in Methanol Rectification
The rectification of methanol is due to the differing relative volatilities of components in the crude methanol mixture.Upon heating,various components in the crude methanol undergo multiple cycles of partial vaporization and condensation at a consistent temperature,leading to the removal of different impurity groups.Ultimately,refined methanol meeting the GB/T 338-2011 standard is obtained,allowing for separation of various mixtures within the crude methanol.The fluctuating feed flow and composition of the methanol mixture result in unstable steam temperature and pressure during distillation.Conventional PID single loop operation and control are inadequate for achieving ideal control in this multi-variable coupling system with significant time delay.Therefore,adoption of advanced control technology is imperative to address these challenges.This paper introduces an advanced control system to enhance automatic stability in methanol distillation,thereby improving key process parameter stability while maintaining product quality in refined methanol production.Implementation of optimal control strategies can reduce unit consumption and increase yield.
methanol rectificationmultivariable coupledtime-delayadvanced process control system
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