飞灰循环流化床锅炉NO_x和N_2O排放控制研究

Studies of NO_x and N_2O Emission Control of Fly Ash Circulating Fluidized Bed Boilers

在１台燃煤量３０ｋｇ／ｈ的飞灰循环流化床装置上进行了ＮＯｘ、Ｎ２Ｏ释放４令性和排放控制的试验研究．研究表明：床温升高，ＮＯｘ增加、Ｎ２Ｏ减少，相同温度下烟煤的Ｎ２Ｏ排放低于无烟煤。分级燃烧的二次风率增至１５％，ＮＯｘ排放降低１４％、Ｎ２Ｏ降低２４％。Ｃａ／Ｓ比增加，导致Ｎｏｘ提高、Ｎ２Ｏ减小．悬浮段温度不大于９３５℃处注氨可以显著降低ＮＯｘ排放量而对Ｎ２Ｏ却无还原效果图１２。

Abstract Studies of NOx and N2O emission control have been performed on a 30 kg/h coal consuming fly ash circulating fluidized bed facility. The studies show that NOx increases with increasing bed femperature while N2O reduces and emission of N2O is less for bituminous than for anthracite coal under same temperature conditions. Emission of NOx is reduced by 14% and that of N2O by 24% if secondary air in staged combustion is increased to 15%. An increase of Ca/S ratio entails an increase of NOx and a reduction of N2O.Injection of amonium into the suspension zone, where the temperature is below 935℃,noticeable deminishes the emission of NOx without showing any reducing effect on N2O.