Investigation Progress on Release and Control of NOx and N2O during Coal Combustion in Circulating Fluidized Bed Combustor
循环流化床燃煤过程NOx和N2O产生-控制研究进展

Circulating fluidized bed (CFB) coal combustion technology has been extensively applied in the past two decades due to its advantages, such as the adaptability to wide range of coal and low pollution emissions compared with other traditional coal combustion technologies. However, high N2O emission is a prominent disadvantage of CFB coal combustion. As the emission limits become more restrict in recent years all over the world, further lowering pollutant emissions in coal-fired CFB combustor is urgently needed. For this purpose, reviewing available knowledge on the emissions, especially NOx and N2O, in coal-fired CFB combustor is of essential importance. The mechanisms of formation and destruction of NOx and N2O homogeneously and heterogeneously in coal-fired CFB combustor were summarized in this work. The influences of operation parameters of coal-fired CFB combustor, such as bed temperature, excess air number, air staging and coal characteristics, on NOx and N2O emissions were discussed. Some common applied technologies of reducing NOx and N2O emissions in coal-fired combustor were also introduced. Two kinds of promising technologies, named as reversed air staging and CFB decoupling combustion were briefly described.