文献类型：期刊文献

中文题名：高钙高铁煤灰熔融及黏温特性研究

英文题名：Ash fusion and viscosity behavior of coal ash with high content of Fe and Ca

作者：胡晓飞[1,2];郭庆华[1,2];刘霞[1,2];龚岩[1,2];于广锁[1,2]

机构：[1]华东理工大学煤气化及能源化工教育部重点实验室,上海200237;[2]煤基能源化工协同创新中心,上海200237

年份：2016

卷号：44

期号：7

起止页码：769

中文期刊名：燃料化学学报

外文期刊名：Journal of Fuel Chemistry and Technology

收录：CSTPCD;;EI(收录号：20162902606201);Scopus;北大核心:【北大核心2014】；CSCD:【CSCD2015_2016】；

基金：国家自然科学基金(51406056);中央高校基本科研业务费专项资金(222201514336;222201414030);上海市浦江人才计划(15PJD011)资助~~

语种：中文

中文关键词：高钙高铁煤;灰熔点;黏温特性;熔渣

外文关键词：high-calciu-high-iron coal; ash fusion temperature; viscosity-temperature behavior; slag

摘要：以金鸡滩煤为原料,沙子为添加剂,研究不同比例添加剂下高钙高铁煤灰熔融及黏温特性变化;通过XRD、高温热台显微镜与扫描电镜-能谱等分析方法研究矿物质转变对其灰熔融及黏温特性影响。结果表明,煤灰熔点随添加剂量的增加先降低后升高,辉石类低温共熔物生成是其降低的主要原因;原煤熔渣黏度波动与钙铝黄长石生成有关,而含铁矿物质析出导致其黏度迅速增加;添加沙子后,煤灰熔渣临界温度显著下降,熔渣由结晶渣向玻璃渣转变。原煤熔渣中Fe、Ca元素分布不均匀,添加沙子后均匀程度明显改善,与黏温曲线测试结果吻合。实验结果表明,沙子是改善高钙高铁煤黏温特性的一种有效添加剂。
Jinjitan coal and sand were respectively chosen as raw material and additive. Under the different proportion of additive,ash fusion and viscosity behavior of coal ash with high contents of Fe and Ca were studied. X-ray diffraction（ XRD）, high-temperature stage microscope（ HTSM） and scanning electron microscopy-energy dispersive spectrometry（ SEM-EDS） were applied to investigate effect of mineral transformation on ash fusion and viscosity behavior of coal ash. The results show that ash fusion temperature decreases at first and then increases with the rising content of additive,and formation of low temperature eutectic augite is the main reason for the lower ash fusion temperature. The viscosity fluctuation is related to the formation of gehlenite, and the precipitation of iron-bearing minerals causes significant increase of viscosity. The temperature of critical viscosity（ tcv） of coal ash slag drops dramatically and the slag type transforms from crystal slag to glass slag with addition of sand. Distribution of Fe and Ca shows obvious different in raw coal slag,but additive makes it become more uniform,which is in agreement with the viscosity curve. Moreover,the industrial results prove that sand is an effective additive to improve the viscosity behavior of coal ash with high content of Fe and Ca.