流化床中煤和生物质混烧N_2O和NO_x排放规律研究

采用煤和生物质混烧的方法来降低流化床燃烧煤中N2O和NOx的排放。实验结果表明,生物质在流化床底部迅速燃烧和热解,释放出大量的挥发分,挥发分燃烧消耗氧气,抑制了燃料氮转变成N2O和NOx;生物质快速燃烧和气化形成多孔性焦炭,有利于N2O和NOx的分解;随着生物质和煤的混合比例增加,N2O的削减率幅度减少,而NOx的削减率幅度基本不变。煤和生物质混烧可以有效降低N2O和NOx的排放。

Emission of N2O and NOx by Co-combustion of Biomass and Coal in Fluidized Bed Boiler

Co-combustion of coal and biomass can decrease N2O and NOx emission effectively. The quick combustion and pyrolysis in the bottom of fluidized bed boiler produces a lot of volatile containing many reductive ions. The reaction of ions and oxygen will restrain the formation of N2O and NOx. Biomass contains much less fuel nitrogen than coal does. The quick combustion of biomass produces much porous char, which help to decompose N2O and NOx. The decreasing intention of N2O decreases with the increase of biomass/coal ratio, while the decreasing intention of NOx keeps unchangeable.