Low NO/sub x/ rotary kiln burner technology: design principles & case study

Abstract

In the coming years, numerous cement plants in USA could be forced to comply with tightening air emission regulations especially with regard to nitrogen oxides (NO/sub x/). The United States Environmental Protection Agency (USEPA) is currently considering low NO/sub x/ rotary kiln burners as a cost effective and efficient choice for NO/sub x/ reduction in cement kilns. This paper discusses the principles behind the design of low NO/sub x/ kiln burner and presents data gathered from research on an industrially scaled cement kiln. Finally, the results in NO/sub x/ emission reduction by means of a low NO/sub x/ burner application on a rotary cement kiln in Europe are presented.