TY - JOUR
T1 - Cyclone fly ash from a grate-fired biomass combustion plant: dependence of the concentration of various components on the particle size
AU - Lanzerstorfer, Christof
PY - 2015/3
Y1 - 2015/3
N2 - In this study cyclone fly ash from a grate-fired combustion plant using forest residues as fuel was split into particle size classes with mass median diameters of 2.0 μm, 4.3 μm, 9.1 μm, 18 μm and 43 μm by use of an air classifier. The particle classes were analysed for total carbon, Na, K, Mg, Ca, Sr, Ba, Ti, V, Cr, Mo, Mn, Fe, Si, Co, Ni, Cu, Zn, Cd, Hg, B, Al, Pb, As, Sb, Bi, Cl-, NO3-, PO43- and SO42- and the size dependence of the concentrations c was modelled using the relation c ~ 1/dN. For several components a considerable dependence of the concentration on the particle size was observed. Increasing concentration with decreasing particle size was found for K, Bi, Cd, Cu, Hg, Pb, Zn and for Cl-, NO3- and SO42-. The metals Al, As, Ba, Fe, Si, Ti and V showed the opposite behaviour. Other components, including TC, Ca, Mg, PO43-, Na and Mn showed no size-dependence. Investigation of single particles by scanning electron microscope in combination with energy-dispersive X-ray spectroscopy revealed that the analysed concentrations are representative for the particle classes only, the composition of single particles in a particle class can deviate considerably.
AB - In this study cyclone fly ash from a grate-fired combustion plant using forest residues as fuel was split into particle size classes with mass median diameters of 2.0 μm, 4.3 μm, 9.1 μm, 18 μm and 43 μm by use of an air classifier. The particle classes were analysed for total carbon, Na, K, Mg, Ca, Sr, Ba, Ti, V, Cr, Mo, Mn, Fe, Si, Co, Ni, Cu, Zn, Cd, Hg, B, Al, Pb, As, Sb, Bi, Cl-, NO3-, PO43- and SO42- and the size dependence of the concentrations c was modelled using the relation c ~ 1/dN. For several components a considerable dependence of the concentration on the particle size was observed. Increasing concentration with decreasing particle size was found for K, Bi, Cd, Cu, Hg, Pb, Zn and for Cl-, NO3- and SO42-. The metals Al, As, Ba, Fe, Si, Ti and V showed the opposite behaviour. Other components, including TC, Ca, Mg, PO43-, Na and Mn showed no size-dependence. Investigation of single particles by scanning electron microscope in combination with energy-dispersive X-ray spectroscopy revealed that the analysed concentrations are representative for the particle classes only, the composition of single particles in a particle class can deviate considerably.
KW - biomass combustion
KW - cyclone fly ash
KW - heavy metal
KW - nutrients
KW - particle size
KW - biomass combustion
KW - cyclone fly ash
KW - heavy metal
KW - nutrients
KW - particle size
KW - Particle size
KW - Biomass combustion
KW - Nutrients
KW - Cyclone fly ash
KW - Heavy metal
UR - http://www.scopus.com/inward/record.url?scp=84923374252&partnerID=8YFLogxK
U2 - 10.1016/j.fuproc.2014.12.010
DO - 10.1016/j.fuproc.2014.12.010
M3 - Article
SN - 0378-3820
VL - 131
SP - 382
EP - 388
JO - Fuel Processing Technology
JF - Fuel Processing Technology
IS - 1
ER -