Simulation of Coal and Biomass Cofiring with Different Particle Density and Diameter in Bubbling Fluidized Bed under O₂/CO₂ Atmospheres

Table 2

Parameters used in the simulation.

Parameters	value
Diameter of coal	0.7 mm
Diameter of biomass	0.9 mm
Density of coal	1280 kg/m^3
Density of biomass	600 kg/m^3
Density of ash	2200 kg/m^3
Fuel feed rate	0.87 kg/h
Restitution coefficient between different particles	0.95
Restitution coefficient between same particles	0.9
O2/CO2 volume fraction	21%/79%
Excess O2 coefficient	1.14
Primary air/ secondary air volume fraction	81%/19%
Gas phase inlet temperature	423 K
Fuel inlet temperature	300 K
Wall temperature	700 K
Velocity of primary air	0.512 m/s
Velocity of secondary air	2.04 m/s
Initial bed height	0.4 m
Initial bed temperature	1123 K

a: the oxygen/fuel ratio normalized by the actual stoichiometric oxygen/fuel ratio.