梧桐木与烟煤混烧的灰分特性分析  

Analysis of the ash characteristic during co-firing of platanewood and bitumite

作　　者：胡云鹏[1] 程世庆[1] 谢敬思[1] 程琦雯[1] 张慧敏[1] 

机构地区：[1]山东大学能源与动力工程学院,山东济南250061

出　　处：《燃料化学学报》2012年第3期286-292,共7页Journal of Fuel Chemistry and Technology

摘　　要：通过SEM/EDS分析、X射线衍射分析和灰熔融性实验对梧桐木与烟煤混烧适宜的灰化温度、灰化时间以及混煤灰的灰分特性进行了研究。研究表明,适宜的灰化时间为2 h,灰化温度则根据不同的梧桐木配比分别选取650、700和800℃。随着梧桐木配比的升高,混烧灰中SiO2和Al2O3的含量逐渐降低,而K2O、CaO和MgO的含量逐渐升高,Na2O和Fe2O3含量的变化,整体维持在较低的水平。当梧桐木配比为30%时,混烧灰中出现钙长石的晶相;当配比为50%时,混烧灰中出现钠长石的晶相,同时莫来石晶相消失,且随着温度的升高混煤灰中结晶相的强度减弱。梧桐木灰中高含量的碱性氧化物与硅铝氧化物所生成的低熔点硅铝酸盐是导致梧桐木混煤灰熔点降低的直接原因。The appropriate ashing temperature,ashing time and ash characteristics of co-firing of platanewood and bitumite were studied by SEM/EDS analysis,X-ray diffraction and ash fusion experiment.It was found that the appropriate ashing time was 2 h.The ashing temperature should be adopted at 650,700 and 800 ℃ according to the different proportions of platanewood proportion.With the increasing of platanewood proportion,the SiO2 and Al2O3 contents decrease,but the contents of K2O,CaO and MgO are the reverse,the Na2O and Fe2O3 contents are at a low level which have no obvious trendy change.Anorthite appears in the ash with the 30% mixture ratio.The albite appears and the mullite disappears with the 50% mixture ratio.The crystalline phase intensity reduces with the increasing of ashing temperature.The aluminosilicate formed by alkali oxides with high content in the platanewood ash and silicon,aluminum oxide is the immediate cause of a low ash fusion point.

关 键 词：灰分特性分析 混烧 晶相 SEM/EDS X射线衍射 

分 类 号：TK6[动力工程及工程热物理—生物能]