8th International Conference on Renewable Fuels, Combustion and Fire, Ankara, Turkey, 5 - 07 March 2021, pp.223-227
This work investigated the particulate matter formation during co-combustion of biomass with coal.
Olive residue in 212-300 μm was chosen as agricultural waste biomass, and Tunçbilek lignite in 106-125
μm as the coal. The biomass was thermally pretreated to assess the influence of the pretreatment
temperature on particulate matter formation during co-combustion. Specifically, the olive residued was
torrefied (at 275 ºC) and pyrolyzed (at 500 ºC) using a tubular oven. The biomass-coal blends in a 50:50
wt.% ratio were co-fired in a drop tube furnace operated at 1200 ºC, heating rate of ~104 ºC/s, residence
time of ~3 s, and dry air atmospheric conditions. The results showed that co-combustion resulted in
clear reduction of PM2.5 emission to values close to those of the biomass fuel, and below the predicted
values. Specifically, combustion of olive residue – Tunçbilek lignite, torrefied olive residue – Tunçbilek
lignite, and olive residue char – Tunçbilek blends resulted in 646, ORT-TL in 408, and 559 mg / MJ input,
respectively. Moreover, the mechanisms responsible for the formation of PM2.5 during biomass and coal
combustion were found applicable to biomass-coal blends.