煤灰对流化床氮氧化物排放影响的试验研究  

Effect of Coal Ash on NO_x Emission of CFB Boilers

作　　者：张俊春[1] 程乐鸣[1] 黄晨[1] 解桂林[1] 方梦祥[1] 

机构地区：[1]浙江大学热能工程研究所,能源清洁利用国家重点实验室,杭州310027

出　　处：《动力工程学报》2012年第6期469-475,共7页Journal of Chinese Society of Power Engineering

基　　金：科技部国际合作项目(2011FR60190)

摘　　要：在流化床试验台上分别燃烧典型烟煤和褐煤,测量加入煤灰和煤灰中无机矿物质(CaO、MgO、Fe2O3、Al2O3、CaSO4、MgSO4)前后N2O和NO排放质量浓度的变化,研究煤灰对流化床氮氧化物排放的影响及其主要活性成分.结果表明:煤灰能降低N2O排放质量浓度,提高NO排放质量浓度;燃料氮向NOx的总转化率随着灰分质量分数的增加而提高;煤灰中影响氮氧化物排放的主要活性成分为CaO、Fe2O3和MgO.Experimental tests were carried out by burning typical bituminous and lignite coal in a benchscale fluidized bed, during which the emitted concentration of both N2O and NO was measured with and without addition of coal ash or inorganic minerals generally contained in coal ash （including CaO, MgO, Fe2 O3, Al2 O3, CaSO4 , and MgSO4）. Results show that coal ash may help to reduce the N2O emission and raise the NO emission; the total conversion rate of fuel nitrogen to NOx, increases with rising mass fraction of coal ash; the main active components in coal ash affecting the NOx emission are respectively CaO, Fe2O3 , and MgO.

关 键 词：流化床 煤灰 排放特性 氧化亚氮 一氧化氮 

分 类 号：X701[环境科学与工程—环境工程]