Discussion
Nitrogen oxides are formed in a cement kiln chiefly
Answer: D
Correct answer: at the high temperatures of the main flame
Thermal nitrogen oxide forms from nitrogen and oxygen in the combustion air, and the rate rises very steeply with temperature - so nearly all of it is produced in the hottest part of the main flame. The calciner, running some 600 degrees cooler, produces far less, which is one of the arguments for burning more fuel there.
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