铁系矿物对煤灰相变过程的内在影响规律研究  

The Effect of Iron-Bearing Minerals on Coal Ash Melting Behavior

作　　者：乌晓江[1,2] 张忠孝[1] 徐雪元[2] 张建文[2] 刘建斌[2] 柳公权[2] 周托[3] 陈玉爽[3] 

机构地区：[1]上海交通大学机械与动力学院,上海200240 [2]上海锅炉厂有限公司,上海200245 [3]上海理工大学动力工程学院,上海200093

出　　处：《工程热物理学报》2011年第8期1425-1429,共5页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(NSFC;No.50906055);上海市青年科技启明星项目(B类)(No.11QB1402100)

摘　　要：为深入研究煤燃烧与煤气化过程中煤中矿物的熔融变化行为对煤灰物理相变变化过程的内在影响规律,本文采用高温热显微镜、SEM-EDX等分析测试手段,实验研究了不同条件(煤燃烧与煤气化)下煤中矿物演变规律与煤灰物理相变变化行为间的内在联系和影响规律。研究结果表明:高铁含量的煤灰A在气化条件下发生初始熔融温度(T_(in))及快速熔融温度(T_(max))要比其在燃烧条件下对应的温度分别低144℃和113℃,而低铁含量的煤灰B则对应气化条件下的T_(in)和T_(max)分别比燃烧条件下的对应温度低25℃和62℃;不同气氛下灰中Fe的不同价态是导致这种差别的主要原因,高温下煤灰相变发生、发展过程中,灰中方铁石、铁铝榴石以及铁做榄石等铁系矿物是引发煤灰发生初始熔融的主要矿物。In order to get more clearly information on the inherent relations between mineral transition and coal ash melting behavior. The internal relationship between mineral transition and coal ash melting behavior was studied by heating microscopy, Scanning Electron Microscope （SEM） combined with EDX （SEM-EDX）. The results showed that the Tin and Tmax of ash A, which contains more iron-bearing minerals, under reducing condition occurs much earlier （144 and 113~C, respectively） than that of under air condition, whereas, the Tin and Tmax of ash B under reducing condition occurs relatively a little earlier （25 and 62℃, respectively） than that of under air condition. The different states of iron （Fe^2＋ or Fe^3＋） are the dominant reasons for different sintering behaviors and cause the different sintering degrees under different conditions at the same temperature. In the coal ash melting process, wustite, almandite and fayalite act as the key factors influencing the initial sintering behavior.

关 键 词：煤燃烧 煤气化 烧结 矿物质 

分 类 号：TK124[动力工程及工程热物理—工程热物理]