摘要
通过对高灰熔融温度的两淮矿区煤(HN)和内蒙古低灰熔融温度煤(ER)分别筛分至>150μm,75~150μm,48~75μm和<48μm四个粒径区间,对不同粒径区间煤样的质量占比、灰分产率进行分析,利用XRF、XRD和热力学平衡计算研究不同粒径区间煤样的灰化学组成、矿物组成和煤灰熔融过程中液相量随煤样粒径的变化规律以及不同粒度煤掺配对灰熔融特性的影响机理。结果表明:HN煤的煤灰平均粒径随着煤的粒径增加而增大,粒径>48μm ER煤的煤灰平均粒径约为3μm;HN煤的灰分产量随着煤的粒径增加而增大,而ER煤则相反。不同粒径区间的HN和ER煤的灰化学组成表现出明显的不均匀性。随煤粒径增大,HN和ER煤灰熔融特征温度(AFTs)分别呈现逐渐增加和减小趋势。不同粒径HN与ER煤相配后,配煤灰熔融温度介于两者之间,而当HN煤(<48μm)与ER煤(>150μm)相配后(质量比1∶1),煤灰中高熔点莫来石转化为低熔点钙长石,使得煤灰流动温度降低最低(1317℃)。
A typical coal with high ash-melting-point from Huainan and Huaibei mining area(HN)and an Inner Mongolia coal with low ash-melting-point blended coal(ER)were selected and sieved into four distinct particle size ranges of>150μm,75~150μm,48~75μm,and<48μm,respectively.The mass ratio and ash yield in each particle size range were analyzed.The ash chemical composition,minerals,and liquid phase formed during ash melting were determined by XRF,XRD,and thermodynamic equilibrium calculation,respectively.The effect of particles size on the ash fusion temperature was investigated through mixing HN coal with ER coal with different particle size.The results indicated that the average ash particle size of HN coal increased with the increase of coal particle size,and the average ash particle size of ER coal was around 3μm when the particle size of ER coal was>48μm;the ash yield of HN coal increased with the increase of coal particle size while the ER coal was opposite.The ash chemical composition of the coal with different particle size was inhomogeneous.The AFTs of HN coal increased with the increase of coal particles while the AFTs of ER coal decreased.When HN coal blended with ER coal with different particle size,respectively,the ash fusion temperatures of the mixed coal was between them.When the HN coal(<48μm)blended with the ER coal(>150μm)in a mass ratio of 1∶1,high melting pointe mineral of mullite in ash was converted to low-melting point mineral of anorthite,resulting in the lowest FT of 1317℃.
作者
刘国斌
夏宝亮
陆启均
郭林芳
李寒旭
李丽莉
武成利
焦发存
LIU Guobin;XIA Baoliang;LU Qijun;GUO Linfang;LI Hanxu;LI Lili;WU Chengli;JIAO Facun(Company of Coal Sales,Huainan Coal Mining(Group)Co.,Ltd.,Huainan 232001,China;School of Chemical and Blasting Engineering,Anhui University of Science and Technology,Huainan 232001,China)
出处
《应用化工》
CAS
CSCD
北大核心
2024年第10期2352-2357,共6页
Applied Chemical Industry
基金
安徽省煤炭资源综合利用工程技术研究中心开放基金(MTYJZX202203)。
关键词
配煤
粒径分布
灰熔融特性
化学组成
矿物种类
coal blending
particle size distribution
ash fusibility
chemical compositions
minerals
