无烟煤掺烧生物质燃烧产物排放特性

摘要

为了研究无烟煤掺烧生物质燃烧产物的排放特性，应用卧式单脚炉燃烧试验系统对燃烧产物排放特性进行了研究，分析了炉温、混合比例等参数对污染物排放特性的影响.结果表明：全木屑燃烧速度最快，火焰最高温度位置提前；增加木屑掺烧比例，可以促进混合燃料的着火，但会使炉膛整体燃烧温度降低；当过量空气系数由1．2降至0．9且煤与木屑掺烧比例为9∶1时，炉膛整体燃烧温度上升，火焰高温区靠近燃烧器附近；混合燃料易燃性增强，降低了燃烧中的CO含量；木屑的加入使燃料燃烧特性增强，氧气耗量增大，从而会形成弱还原气氛，有助于降低燃烧中N Ox 的生成.%The horizontal single foot furnace combustion test system was employed to carry out emission characteristics study on combustion and co-combustion of biomass and anthracite.The effect of furnace temperature and mixing ratio on emissions characteristics was investigated.The results show that:the wood had the fastest burning rate,its peak flame temperature moved in advance;increasing the sawdust proportion can promote ignition of the mixture but reduce the overall combustion temperature;when the excess air coefficient decreased from 1.2 to 0.9,the overall combustion temperature increased and the flame temperature zone moved in advance.The flammability of the mixed fuel enhanced,which reduced the CO content during combustion;addition of the sawdust enhanced the combustion,consumed a large amount of oxygen,thus to form a weak reducing atmosphere to help reduce the formation of NOx.