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在一个实验室规模流化庆反应器上进行了三种煤的燃烧试验,以估计在流化床燃烧过程中燃料成分和主要运行参数对N_2O和NO生成的影响。试验结果证实,在923K至1273K温度下N_2O排放量很高(30～200μL/L)。决定燃料氮生成N_2O的主要参数是燃烧温度、煤种和过量氧。降低温度导致N_2O生成量增加而同时NO生成量减少,烟煤N_2O产量要比贫煤高一些。空气燃料比影响N_2O产量,特别在接近理想配比燃烧工况时,N_2O排放减少。燃料粒径对N_2O的产生在低温下有一定影响,在高温下影响不大、加入石灰石脱硫使N_2O排放减少。
Three coal combustion tests were conducted on a laboratory scale fluidization reactor to estimate the effect of fuel composition and main operating parameters on N2O and NO formation during fluidized bed combustion. The test results confirm that N 2 O emissions are high (30-200 μL / L) at 923K to 1273K. The main parameters that determine the formation of N2O from fuel nitrogen are combustion temperature, coal type and excess oxygen. Decreasing the temperature led to the increase of N2O production while the NO production decreased, and the yield of bituminous coal N2O was higher than that of lean coal. Air-fuel ratio affects N 2 O production, especially at near stoichiometric combustion conditions, with reduced N 2 O emissions. The particle size of fuel had a certain effect on the production of N 2 O at low temperature and had little effect at high temperature. Addition of limestone desulfurization reduced N 2 O emissions.