DESIGN OF AUTOMATION FOR THE ABSORPTION PROCESS IN HYDROGEN PURIFICATION FROM CARBON DIOXIDE

This article discusses the automation of the methanol-acetone mixture absorption process to improve control efficiency. The existing local automatic control system (ACS) was upgraded to a cascade system, reducing component concentration deviations by 12% and decreasing the transition process time from 1606 to 1592 seconds. A mathematical model of the gas absorption process was developed, incorporating material balance equations, mass transfer equations, and transfer functions. The parameters of the PI controller were calculated to ensure system stability under ±10% coefficient variations. A comparative analysis of system characteristics before and after modernization confirmed a reduction in overshoot to 0% and an increase in response speed. The study also considers the impact of nonlinear factors such as control signal saturation. The implementation of cascade control minimized phase shift, reduced the influence of external disturbances by 18%, and improved the system’s dynamic characteristics. The obtained results demonstrate the feasibility of implementing a cascade ACS for rectification process automation.