NO_x emission reduction by staged combustion in grate combustion of biomass fuels and fuel mixtures

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• 作者：Ehsan Houshfar^a ; &Oslash ; yvind Skreiberg^b ; ^{oyvind.skreiberg@sintef.no} ; Du&scaron ; an Todorovi膰^c ; Alexandra Skreiberg^b ; Terese L&oslash ; vå ; s^a ; Aleksandar Jovovi膰^c ; Lars S&oslash ; rum^b
• 关键词：Biomass ; NOx reduction ; N2O ; Primary measures ; Air staging
• 刊名：Fuel
• 出版年：2012
• 期刊代码：33_00162361
• 类别：ce
• 出版时间：August, 2012
• 卷：98
• 期：Complete
• 页码：29-40
• 文件大小：1732 K

摘要

NO_x and N₂O emissions have been investigated for different pelletized biomass fuels and fuel mixtures thereof both with and without air staging in a grate fired multi-fuel reactor. The fuels investigated are wood, demolition wood and coffee waste, and selected mixtures of these. The multi-fuel reactor was operated at close to constant operating conditions due to impactor (ELPI) measurements, with a total excess air ratio of about 1.6, and a primary excess air ratio of about 0.8 in the air staging experiments. The reactor set point temperature was held constant at 850 掳C. NO_x emission levels as a function of air supply mode and fuel nitrogen content are reported, showing a large NO_x reduction potential, up to 91%and corresponding to less than 20 ppm NO_x at 11%O₂ for a fuel containing about 3 wt.%fuel-N, using air staging. The effect on N₂O, however, is adverse at the selected set point temperature and optimum primary excess air ratio for NO_x reduction. The effect of fuel mixing and fuel nitrogen content on the conversion of fuel nitrogen to NO_x is also reported and discussed. Fuel mixing has a positive influence on the NO_x emission level, but a negative influence on the overall conversion factor for fuel-N to NO_x and N₂O.