The aqueous ammonia (NH3) injection system for nitrogen oxide (NOx) emission reductions at a cement plant in Florida, USA, provided limited ability for flow downturn and material usage efficiency. A new injection system, provided by Lechler, considerably lowered the use of NH3  in its NOx reduction system. By Stewart McKenzie and Aly Gilbertsen, Lechler Inc, USA, and Daniel Ball, Argos Cement, USA.

The goal of all nitrogen oxide (NOx) control systems at cement plants is to produce the highest NOx removal with minimal reagent use and cost while preventing ammonia slip. US-based Lechler Inc uses selective non-catalytic reduction (SNCR) systems injecting aqueous ammonia.

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