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In this study, a swirling fluidized-bed combustor (SFBC) using an annular spiral air distributor was fired with rice husk. In order to control NO emission from the combustor, rice husk was moisturized by adding water to ldquoas-receivedrdquo fuel, while CO emission was mitigated via injection of secondary air into the bed splash zone. The SFBC was tested at constant fuel feed rate for variable fuel-moisture...