SiO2-Al2O3型矿物对煤灰熔融温度的影响  

Effects of SiO2-Al2O3 Minerals on Coal Ash Fusion Temperatures

作　　者：程相龙 常月 郭晋菊 黄修河 魏建平 王明印 马名杰[3] CHENG Xianglong;CHANG Yue;GUO Jinju;HUANG Xiuhe;WEI Jianping;WANG Mingyin;MA Mingjie(School of Materials and Chemical Engineering,He’nan University of Urban Construction,467036 Pingdingshan,China;Shandong Huineng New Materials Technology Company Limited,272200 Jining,China;School of Materials and Chemical Engineering,He’nan Polytechnic University,454150 Jiaozuo,China)

机构地区：[1]河南城建学院材料与化工学院,河南平顶山467036 [2]山东汇能新材料科技股份有限公司,山东济宁272200 [3]河南理工大学材料科学与工程学院,河南焦作454150

出　　处：《煤炭转化》2020年第6期66-74,共9页Coal Conversion

基　　金：河南省科技攻关计划项目(202102310238);煤盐资源高效利用河南省工程实验室开放基金资助项目(20171015).

摘　　要：以156种煤样为对象,分析了煤灰化学组成与变形温度(t D)和软化温度(t S)的关系,进而研究了煤灰中SiO 2-Al 2O 3型矿物质量分数与煤灰t D和t S的关系,提出用SiO 2-Al 2O 3型矿物质量分数预测t D和t S的新方法,并与常用的从化学组成线性预测方法进行比较。结果表明:SiO 2,Al 2O 3,Fe 2O 3,CaO,MgO中只有Al 2O 3的质量分数与t D和t S具有一定线性相关性,且相关性系数均小于0.13,而SiO 2-Al 2O 3型矿物中高岭石(Al 2O 3·2SiO 2·2H 2O)、硅线石(Al 2O 3·SiO 2)和莫来石(3Al 2O 3·2SiO 2)的质量分数与t D和t S的线性关系比较显著,相关性系数均大于0.50;以莫来石(3Al 2O 3·2SiO 2)为目标矿物,对其他化学组分合理分组,拟合得到t D和t S的预测式,对27种典型煤样的软化温度进行预测,80%的预测值误差小于5.00%,随着温度升高,预测值的误差减小,尤其在温度高于1325℃时,误差多在0.02%~1.99%之间。因此,与化学组成相比,SiO 2-Al 2O 3型矿物质量分数与t D和t S具有更好的线性相关性,也更贴近氧化物的赋存状态,新预测方法误差更小。In order to explore a simple and accurate method for predicting the coal ash fusion temperature,156 coal samples were prepared and the relationship between the coal ash chemical composition and deformation temperature(t D)/softening temperature(t S)was analyzed.And then the relationship between the mass fraction of SiO 2-Al 2O 3 mineral and t D/t S was further studied,based on which a new method for predicting t D and t S by using the mass fraction of SiO 2-Al 2O 3 mineral was proposed.The results show that among SiO 2,Al 2O 3,Fe 2O 3,CaO,and MgO,only the mass fraction of Al 2O 3 had a linear correlation with t D/t S,with the correlation coefficient less than 0.13.By contrast,the mass fraction of SiO 2-Al 2O 3 minerals(Al 2O 3·2SiO 2·2H 2O,Al 2O 3·SiO 2,and 3Al 2O 3·2SiO 2)have a significant linear relationship with t D/t S,with the correlation coefficients greater than 0.50.Taking mullets(3Al 2O 3·2SiO 2)as the target mineral and grouping other chemical components reasonably,a new correlation is fitted and it is more accurate than the commonly used linear correlation.When the new fitting method is applied to 27 coal samples,80%of the predictive values(t S)fell within the prediction accuracy with a mean error lower than 5.00%.Specifically,the error rang from 0.02%to 1.99%when the temperature ranged from 1350℃to 1500℃.Therefore,compare with chemical composition,the mass fraction of SiO 2-Al 2O 3 minerals have a better linear correlation with t D/t S,and is closer to the occurrence state of oxides.

关 键 词：SIO2-AL2O3 矿物含量 熔融温度 化学组成 线性相关 

分 类 号：TQ53[化学工程—煤化学工程]