Development of Process Control Strategy for Acid Gas Sweetening Process

Abstract This study aims to develop a process control strategy for the acid gas sweetening process based on dynamic simulation, disturbances of ±5 % are introduced in terms of flowrate and composition. The stability and controllability of control system are evaluated using indicators such as integral absolute error ( IAE ) and deviation in heat duty ( ∆Q ). The results demonstrate that the composition‐ratio control scheme for the absorption section combines the advantages of fast response from ratio calculation and precise composition control. Accordingly, the double‐temperature control scheme for the regeneration section effectively mitigates overshoot and reduces settling time, resulting in a significant reduction of 31 % for a IAE of H 2 S concentration in lean solvent and 26 % for the ∆Q , respectively.