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Optimization of CO Absorption Using Advanced Control and Selective Amine and Demineralized Water Make-up System

Uche Noel P. Ajie, Emeka J. Okafor and Dulu Appah

Abstract

The paper presents the optimization of CO2 mass transfer using a selective makeup advanced process control, leading to improved efficiency and reduced energy consumption in an Absorption Column operating at 80.0 barg. The advancement of CO2 absorption has greatly improved with the integration of auto-amine concentration monitoring and makeup mechanisms. By employing inline probes, the feedback control system consistently evaluates the electrical conductivity variables of the PZ+MDEA stream against the 700 µS/cm reference signal, enabling immediate and precise adjustments to the absorption parameters, selectively regulating the ratios of dry amine and water through three-way control valves to maintain the 40 – 45g/100ml stability for optimum CO2 capture. This automation method at PZ+MDEA 43.34 g/100ml inlet concentration, 702.16 micro S/cm EC, 46.5oC lean amine, and pH of 11.34 reduced the rich gas stream CO2 of 20,104.77ppm to 258.51 ppm residue with an average performance of 98.72% and is poised to become a key aspect of sustainable industrial practices.

Keywords

CO2 capture; Advanced Process Control; Amine concentration monitoring and

References

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