Co-combustion of unburned carbon separated from lignite fly ash

Studies indicate that it may be expedient to recycle the smallest fraction of unburned carbon (B08) and further co-combust it with lignite, while largest fractions (B10 and B15) may be considered as valuable materials for preparation of briquettes/pellets and/or activated carbon for flue gases purification. Moreover, performed analyses prove that co-combustion of even 40% contribution of unburned carbons will not considerably deteriorate ignition behaviour, flame stability, fuel burnout, NOX and SO2 emissions and will not increase slagging and fouling risks.