Results of fly ashes from combustion of hard coal and co-combustion of alternative fuel (SRF) with coal
in the stoker boiler WR-25 type studies have been shown. Samples of fly ashes were acquired during industrial
combustion tests of hard coal and blend of coal with 10% SRF. The scope of comparative research included:
chemical composition, contents of combustible parts and trace elements and also of microscopic analysis. The
specific surface area SBET was established and tests of water extract were conducted. Chemical composition of
mineral substance of both studied ashes is similar. Main ingredients are: SiO2, Al2O3, Fe2O3 and CaO. Fly ash from
co-combustion of SRF with coal in a stoker boiler is characterized by high contents of combustible parts (on 30%
level), higher than ash from hard coal combustion. Both tested ashes are characterized by specific surface area
SBET on the level of 8–9 m2/g. In porous structure mesopores are dominant (>60%), and their volume is higher
for fly ash from co-combustion of SRF with coal. Fly ash from co-combustion of waste is characterized by high
contents of heavy metals. Nevertheless these metals and also other pollutants do not show leachability exceeding
acceptable values for wastes different than hazardous. The microscopic structure of fly ashes from combustion
of hard coal and co-combustion of alternative fuel studies showed crucial differences, especially in reference
to organic material. Presented research results have shown that fly ash from co-combustion of SRF with coal in
a stoker boiler can obtain the status of non-hazardous waste.
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