IGTC-46 Advanced Control for a NO_x Decomposition Process of a Thermal Power Plant(Session B-7 COMBUSTION II)

概要

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An advanced control system for a nitrogen oxides (NO_x) decomposition process of a combined cycle power plant is developed. The NO_x in an exhausted gas flow from a gas turbine is decomposed by ammonia (NH_3) on a catalyst. This NO_x decomposition process has a large dead time and a strong nonlinearity. To keep the NO_x discharging flow rate to a set value, an NH_3 injection flow rate is modulated. The NO_x control system has a cascade scheme ; it is composed of a NO_x flow rate compensator and an NH_3 control. A Generalized Predictive Control (GPC) method is introduced into a NO_x flow rate compensator to achieve good feedback control of a long dead timed process. A precompensator is utilized not only to reduce the disturbance effect but also to deal with plant nonlinearity. A Linear Quadratic Regulator (LQR) method is applied for the NH_3 control to decouple an interactive plant. To reduce the amount of computation, the control system has a dual sampling rate structure. The controller is experimented at the combined cycle power plant in a commercial operation. Test results demonstrate performance and practicability of the developed control system.
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