Hello

 I'd like to know about NO reduction in cement process, I have bee reading some articles related with NO reduction. The process that is mentioned is:

The injection reducing agent and promoters that can be added to reducing agent. The NO reduction capacity of solid fuels in reburning conditions.

 My questios are:

In the combustion operation in cement process; what part of the operation is refered to "reburning conditions"?

What kind of "injection reducing agent" could be used in cement process in order to reduce NO emissions? , I think the "reducing agents are the alternative fuels, maybe; and the promoters are metals that acts as a "catalizador"......

Please tell me something about this.. If I am definitly lost about this.