Title: Dynamic output feedback based robust controller design for selective catalytic reduction systems

Authors: Baigeng Wang; Shurong Li

Addresses: Automation School, Beijing University of Posts and Telecommunications, Beijing, 100876, China ' Automation School, Beijing University of Posts and Telecommunications, Beijing, 100876, China

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.

Keywords: SCR; selective catalytic reduction; dynamic output feedback; reduced order observer; robust control; Lyapunov function.

DOI: 10.1504/IJSCIP.2021.125149

International Journal of System Control and Information Processing, 2021 Vol.3 No.4, pp.263 - 277

Received: 06 Sep 2020
Accepted: 02 Jul 2021
Published online: 31 Aug 2022 *

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