Keywords: احتراق بستر تحت فشار مایع; UC; Unburned carbon; FBC; Fluidized bed combustion; PFC; Pulverized fuel combustion; PFBC; Pressurized fluidized bed combustion; LOI; Loss on ignition; FA; Fly ash; BA; Bottom ash; ESP; Electrostatic precipitator; 1Â M NH4OAc; Ammonium acetate (1Â mol/L);