METHOD OF IMPROVING NOX EMISSIONS CONTROL IN ROTARY PREHEATER LIMESTONE KILNS

摘要

This invention relates to a method to further enhance NOSUBx /SUBreduction in rotary preheater mineral kilns by coupling the temperature control and gas composition uniformity afforded by the high temperature mixing with the use of chemical reducing agents. The chemical reducing agent or agents, generally chosen from ammonia or ammonia precursors, are introduced at a specific point in the rotary preheater kiln which has as an optimal temperature window to achieve the greatest reduction of NOSUBx /SUBemissions.