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- W2000659833 abstract "NO x (i.e., NO and NO2) and N2O are known as harmful pollutants. In fluidized bed combustion these are formed from the nitrogen in the fuel. To develop effective primary measures reducing the emissions, more knowledge on the mechanism of formation and destruction ongoing in fluidized beds has to be obtained. In this work, a detailed chemistry model is combined with a two-phase model for a stationary fluidized bed to calculate the emissions of a single fuel particle in a laboratory-scale stationary fluidized bed. The single particle model consists of a simple model for the H2O release during drying, a model for the volatiles composition, and a model for the nitrogen chemistry during char combustion. The detailed reaction mechanism consists of a homogeneous part, heterogeneously catalyzed reactions on the bed material, and radical recombination reactions on the solids’ surface. The results confirm that devolatilization and char combustion are of nearly equal importance for NO and N2O formation. During devolatilization, NO is formed from HCN and NH3, while N2O is formed almost exclusively from HCN. During char combustion, NO is mostly formed by heterogeneous oxidation of char nitrogen, while N2O is formed from homogeneous oxidation of HCN. On the other hand, there is also a back coupling of NO on the homogeneous burnout of the carbon containing species, by sensitizing the oxidation of CH4." @default.
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- W2000659833 date "2001-05-10" @default.
- W2000659833 modified "2023-09-23" @default.
- W2000659833 title "NO x and N2O Formation Mechanisms—A Detailed Chemical Kinetic Modeling Study on a Single Fuel Particle in a Laboratory-Scale Fluidized Bed" @default.
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- W2000659833 doi "https://doi.org/10.1115/1.1383973" @default.
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