Yellow fumes

Dear All,

i have a small querry that from preheater stack yellow fumes are coming i have checked all possible things  like alkali,chalorides  so any one can give me a specific reason for these yellow fumes.

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Re: Yellow fumes

Yellow (or orange) fumes indicate an excessive amount of NOx coming out of your stack. This indicates a very hot main burner and/or calciner burner flame temperature combined with highly oxidising kiln conditions.

As a last resort, NOx can be reduced by adding a small amount of ammonia or urea solution to the preheater gas stream at a location upstream from the pre-calciner, where the gas temperature is between 850 and 1150 deg.C.

Plenty of information on this process is available on the internet.

Regards,

Ted.

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