State-of-the-Art Nitrogen Oxide Removal from Off-Gases of Stationary Sources by Ammonia

Although selective catalytic reduction (SCR) of NOx is presently a mature technology, new design applications and stricter performance requirements present significant challenges and an urgent need for innovative technology development. This article discusses the state-of-the-art design of commercial ammonia-based SCR systems designed for stationary sources.

Particular attention is given to controlling NOx and ammonia slip emissions at ultra-low concentrations, new generation of exhaust systems for simple cycle power plants, improved ammonia injection grids, control systems designed for non-steady state operations, mathematical modeling of SCR systems designed for power plants and SCR catalyst poisoning.

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