燃烧气氛对燃煤飞灰磁特性的影响  

Effects of Combustion Atmosphere on Magnetic Characteristics of Coal-fired Fly Ash

作　　者：卓文钦[1] 吴新[1] 赵长遂[1] 

机构地区：[1]东南大学能源与环境学院,江苏省南京市210096

出　　处：《中国电机工程学报》2010年第32期53-57,共5页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(973项目)(2006CB705806-01)~~

摘　　要：在一模拟流化床燃烧温度的沉降炉实验装置上制备了3种煤样在不同燃烧气氛下的飞灰样品。采用穆斯堡尔谱法定性分析了燃煤灰样中的含铁物相,并通过振动样品磁强计测试其磁特性。结果表明,燃烧气氛对燃煤灰样中的矿物晶体相包括含铁物相的种类没有影响,而对其相对含量有一定的影响。燃煤灰样中的γ-Fe2O3和Fe3O4是造成其铁磁特性的主要因素。氧浓度的降低导致3种燃煤灰样的饱和磁化强度均有不同程度的增加,而在O2/CO2气氛燃烧条件下,燃煤灰样的饱和磁化强度与煤种类型相关,会表现出不同的增减趋势。In a drop tube furnace with the similar temperature of fluidized bed combustion, ash samples were collected at different atmosphere. Mossbauer spectroscopy was employed qualitatively to analyze crystal components in the fly ash, and vibrating sample magnetometer （VSM） was employed to analyze the magnetic characteristics of fly ash. The results show that combustion atmosphere does not affect the types of crystal components formed, however, it does affect the relative amounts in the fly ash, among which γ-Fe2O3 and Fe3O4 are ferromagnetic substances. Saturation magnetization of fly ash increases with reducing oxygen concentration. While in O2/CO2 atmosphere, saturation magnetization of fly ash shows different trends with different types of coal.

关 键 词：燃煤飞灰 铁磁性物质 磁特性 O2/CO2气氛 

分 类 号：X513[环境科学与工程—环境工程]