유동층 반응기 내 탄소 중립 NH3 혼소 특성: 혼소율 및 Stoichiometric ratio의 영향
Carbon Free NH3 Co-firing Behavior in Fluidized Bed Reactor: Effect of Blending Ratio and Stoichiometric Ratio
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NH3, as one of the carbon-free fuels, is emerging as a new energy source for power generation. NH3 is being partially introduced into thermal power plants, accelerating its practical application as a fuel. In this study, experiments are conducted to apply NH3 in circulating fluidized bed(CFB) boilers. The objective of this research is to investigate fundamentally the effects of NH3 co-firing ratios(0-50%) and the stoichiometric ratio(SR) on combustion and various exhaust emissions to derive the optimal conditions for NH3 co-firing with coal using a bubbling fluidized bed(BFB) reactor. Results indicate that as the NH3 co-firing ratio increased, the emission values of CO2 and SO2 generated from coal combustion decreased. as the NH3 co-firing ratio increase up to 30~40%, the NOx gradually increase while higher co-firing ratio result in lower NOx value because unburned NH3 remaining in the reducing zone contribute to NOx reduction by selective non-catalytic reduction(SNCR) reactions. Furthermore NH3 should be injected into an appropriate reducing zone with a low SR for effective NOx reduction.
Abstract
NH3, as one of the carbon-free fuels, is emerging as a new energy source for power generation. NH3 is being partially introduced into thermal power plants, accelerating its practical application as a fuel. In this study, experiments are conducted to apply NH3 in circulating fluidized bed(CFB) boilers. The objective of this research is to investigate fundamentally the effects of NH3 co-firing ratios(0-50%) and the stoichiometric ratio(SR) on combustion and various exhaust emissions to derive the optimal conditions for NH3 co-firing with coal using a bubbling fluidized bed(BFB) reactor. Results indicate that as the NH3 co-firing ratio increased, the emission values of CO2 and SO2 generated from coal combustion decreased. as the NH3 co-firing ratio increase up to 30~40%, the NOx gradually increase while higher co-firing ratio result in lower NOx value because unburned NH3 remaining in the reducing zone contribute to NOx reduction by selective non-catalytic reduction(SNCR) reactions. Furthermore NH3 should be injected into an appropriate reducing zone with a low SR for effective NOx reduction.
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