Effects of ash fouling on heat transfer during combustion of cattle biomass in a small‐scale boiler burner facility under unsteady transition conditions

摘要: Combustion of cattle biomass (CB) as a supplementary fuel has been proposed for reducing emissions NOx, Hg, SO2, and nonrenewable CO2 in large coal-fired power plants; however, its high ash content resulted fouling slagging problems when the CB was co-fired with coals during small- pilot-scale tests. Ash depositions combustion reburn were investigated using 30 kWt (100 000 Btu h−1) boiler burner facility water-cooled heat exchangers (HEXs) under unsteady transition conditions short-term operations. Two parameters used to characterize effects deposition: (1) Overall transfer coefficient (U) (2) Burnt fraction (BF). A methodology presented empirically demonstrated deposition on conditions. Experiments involving reburning compared experiments only ash-less natural gas. It found that growth layer lowered rate water HEXs. In low-temperature regions, thin promoted radiation effects, while thick thermal resistance layer. chemical analysis heavy indicated BF increased larger fuels, indicating better performance coal alone. However, results fusion temperature deposited more difficult remove than Copyright © 2010 John Wiley & Sons, Ltd.