Optimal Ammonia Injection for Emissions Control in Power Plants

Abstract

One of the effective devices to reduce NO x in power plants is the ammonia based selective catalyst reduction (SCR) system. In this paper, kinetic SCR model simulator is tuned and validated with representative site data from an actual combined-cycle power plant. This simulator is then used for the development and implementation of model predictive control (MPC) for SCR systems to control the plant startup NO x emissions along with maintaining ammonia slip within the acceptable limit. Also, the results of linear and nonlinear MPC are compared. The startup NO x reduction obtained in both cases is seen to be close to ~85%, but the computational effort required for both these approaches differ significantly.

Experimental investigation of the evaporation behavior of urea‐water‐solution droplets exposed to a hot air stream

“…A sound understanding of all the physical and chemical processes that follow the injection of UWS into the hot exhaust gas stream is required to estimate and inject the right quantity of UWS, to achieve complete conversion of NOx without causing ammonia slip . Over the past few decades, researchers have conducted several experimental, as well as numerical studies on the performance of SCR systems, to further the understanding of these processes.…”

Sustainability and process control: A survey and perspective

“…Control systems have been developed and evaluated for emission control on boilers, power plants and automobiles. Research efforts have been directed in the area of monitoring [114], estimation [115][116][117], cascade control [118], adaptive control [119,120], model-based feedback control [121][122][123][124], linear MPC [125,126] and nonlinear MPC [127,128].…”

Adsorption behavior of Pt embedded on N‐doped graphene sheets toward NO and NH3 molecules

“…Although SCR method can be used to reduce NO x emissions well, there are still various problems in actual operation. Unsuitable ammonia injection rate may result in either unreacted NO x emissions or excessing NH 3 emissions known as ammonia slip . In addition, NO x removal efficiency is relatively low in low temperature environments.…”