Abstract
Ash formation and deposit characteristics during co-combustion of coal with 25 wt% and 50 wt% of rice straw (RS), eucalyptus wood (EW), and palm empty fruit bunch (EFB) were investigated. The experiments were carried out in the 10 kWth circulating fluidized bed (CFB) reactor. A deposit probe was installed downstream of the recirculation cyclone and the deposit weight could be continuously monitored throughout the experiment by a high precision balance. After 8 h of combustion, excessive fouling deposit could be clearly observed for all experiments of fuel blends as compared to pure coal experiment. At 50% biomass blending ratio, the highest deposit was found for the blend with RS, followed by EW and EFB. The initial deposition rate (the first 2 h) of co-firing with 50 wt% RS was also much faster, i.e. almost double that of EW and EFB at the same blending ratio. The high ash content in rice straw in addition to the ash composition determined its high deposition growth. The amount of deposit was also proportional to the biomass blending ratio. Fouling mechanisms were different depending on the fuel ash composition. FactSage simulation was carried out to predict the ash speciation and explain the mechanism of deposit formation.
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