Industrial application and results of low NOx precalciner systems

Abstract

In our 1992 IEEE paper entitled `Low NOx Pyro-systems' we outlined the design concept of a new calciner generation which allows for the reduction of nitric oxides generated in the rotary cement kiln. Since that time five industrial installations have gone into operation and we currently have another 12 in some phase of construction. After a brief description of the process and the specific factors governing equipment design, this paper will present on the industrial experience gained at several installations operating with a Humboldt Wedag calciner. The present and future development of this technology is also discussed, concluding with comments concerning the important aspects to be considered when applying this new calciner technology.