Dynamic output feedback based robust controller design for selective catalytic reduction systems
by Baigeng Wang; Shurong Li
International Journal of System Control and Information Processing (IJSCIP), Vol. 3, No. 4, 2021

Abstract: Selective catalytic reduction (SCR) is an effective way to deal with the flue gas at the outlet of coal-fired boiler. The working process of SCR systems is to use the ammonia (NH₃) adsorbed on the catalyst to react with nitrogen oxide (NO_x) to generate nitrogen and water. This paper presents an observer based dynamic output feedback control for SCR systems. Since NH₃ coverage ratio cannot be measured directly, a reduced order observer is designed first. And then it is proved that the error of observer tends to 0 by using Lyapunov function. Furthermore, the dynamic equation of the composite including the observer state is obtained. Finally, the controller is designed to adjust the rate of NH₃ injection in order to satisfy the industrial demand.

Online publication date: Wed, 31-Aug-2022

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