Salient Technical Features
Combustion modification is an in-furnace modification for reducing NOx
generation during combustion process by Air Staging in furnace. This technique
produces staged combustion by introducing a portion of the secondary air above
the firing zone, which in turn reduces the amount of available oxygen in the main
combustion zone where NOx is generated. In this arrangement there is no change
in total quantity of combustion air being introduced to the furnace remains
unchanged. Only the air distribution between zones is changing.
Concentric firing system also shall be installed which shall form the first stage of
air staging. OFA shall result in second stage of air staging.
The air admitted thru’ the furnace above the combustion zone, results in third
stage firing which completes combustion and reduces the NOx formation at high
heat zone.
