煤和生物质床层燃烧氮氧化物生成规律的对比研究

为揭示和评估燃料特性对床层燃烧过程中氮氧化物生成规律的影响,选取了燃煤与生物质成型颗粒这两种代表性燃料,在单元体炉试验台上模拟层燃反应过程,并测定了床层表面和内部的温度及气氛.结果表明:无论燃煤还是生物质,床层内部的氮氧化物浓度峰值都显著高于床层表面,证实了炭层对氮氧化物优良的还原作用.生物质与燃煤相比火焰锋面处的氮氧...

Comparative Investigations on the Formation of Nitric Oxides during Grate Combustion Process of Coal and Biomass

In order to reveal and evaluate the influence of fuel properties on the formation of nitric oxides during grate-combustion process,two representative fuels,i.e.,coal and biomass pellets,were selected.The grate combustion process was simulated on a unit furnace apparatus,and the evolution of temperature and gaseous species were determined.The results indicated that both for coal and biomass,the concentrations of nitric oxides at the ignition front inside the fuel bed were significantly higher than that at the surface of the fuel bed,which proved the excellent performance of NO x reduction by the char layer.The concentration of nitric oxides during biomass combustion was higher at the ignition front comparing with coal,and the decreasing rate of the concentration of nitric oxides were slower.