There are a number of case studies of cement kilns burning petcoke and having no SOx emission problems. It is correct that the predominantly alkaline feed absorbs any SO2 in the kiln exhaust gases due to the intimate contact between the gases and the feed in the preheater cyclones. There is a greater potential for SOx emissions with long kilns (ie without preheaters).
admin
We will appreciate your support clarifying the following points:
1-False air effect upon the (increase/decrease) of dust load in a closed system of air swept type ball mill (between the mill outlet duct-seperator-cyclones-filter-stack). Also, will the dust resistivity increase/decrease?
1-False air effect upon the (increase/decrease) of dust load in a closed system of air swept type ball mill (between the mill outlet duct-seperator-cyclones-filter-stack). Also, will the dust resistivity increase/decrease?
admin
The NOx emissions arise from two sources: (i) the nitrogen in the fuel as you say, and (ii) "thermal" NOx from the breakdown of atmospheric nitrogen at the high temperatures in the burning zone. Usually the thermal NOx is much higher than the fuel NOx and the best way to reduce NOx emissions is to reduce this thermal NOx. Low NOx burners reduce the temperatures in the flame and produce less NOx by using less primary air. Low NOx calciners burn some of their fuel in a depleted oxygen environment to cause NOx degradation by the following reaction: NO + CO -> 0.5N2 + CO2. These are the best way sto reduce the NOx emissions of the kiln.
admin
Our government is starting to limit NOx emissions from cement kilns and the regulation, as I heard, was more severe than in the European countries. I think the best way for reducing NOx emission with no further cost is to use fuels that contain the lower nitrogen content, especially coal and residual fuels. Am I correct?