染布厂污泥对高灰熔融温度(AFT)煤灰熔融行为的改性及其机理  

Modification of ash fusion behavior of high ash fusion temperature(AFT)coal by textile dyeing sludge addition and its mechanism

作　　者：赵超越 李风海 马名杰[1] 李洋 赵薇 张许静 房倚天 ZHAO Chao-yue;LI Feng-hai;MA Ming-jie;LI Yang;ZHAO Wei;ZHANG Xu-jing;FANG Yi-tian(School of Chemistry and Chemical Engineering,Henan Polytechnic University,Jiaozuo 454003,China;Department of Chemistry and Chemical Engineering,Heze University,Heze 274000,China;State Key Laboratory of Coal Conversion,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001,China;Ten Mines of Pingdingshan Tianan Coal Co.Ltd.,Pingdingshan 467021,China)

机构地区：[1]河南理工大学化学化工学院,河南焦作454000 [2]菏泽学院化学化工学院,山东菏泽274000 [3]中国科学院山西煤炭化学研究所煤转化国家重点实验室,山西太原030001 [4]平顶山天安煤业有限公司十矿,河南平顶山467021

出　　处：《燃料化学学报》2022年第6期703-713,共11页Journal of Fuel Chemistry and Technology

基　　金：supported by the Natural Science Foundation of China (21875059);the Natural Science Foundations of Shandong Province,China(ZR2018MB037)

摘　　要：为解决煤气流床(EFB)气化过程中的结渣问题,在还原气氛下研究了染布厂污泥(TDS)对高灰熔融温度(AFT)煤的熔融特性的影响。通过X射线衍射、傅里叶变换红外光谱(FT-IR)和FactSage计算研究其变化机理。结果表明,当TDS含量添加20%−25%时,流动温度降至1380℃以下,满足EFB气化的液态排渣要求。随着TDS含量的增加,低熔点矿物(如铁尖晶石、钙长石和钠长石)的形成导致AFT降低。网络结构的桥氧键被金属离子(如Fe^(2+)、Ca^(2+)、Na^(+))破坏,大量的非桥氧(NBO)键生成,导致硅酸盐网络结构疏松,AFT降低。Si−O−Si键和Si−O−Al键的峰值强度逐渐降低,Fe−O键和Si−O−M(M:Ca^(2+)或Na^(+))键的振动增强被FT-IR证实了NBO的形成。FactSage计算的结果与实验中灰熔融行为具有一致性。To address the slagging problem during coal entrained-flow bed(EFB)gasification,the influences of textile dyeing sludge(TDS)addition on the fusing characteristics of high ash fusion temperature(AFT)coal were explored under a reducing atmosphere.And the change mechanisms were investigated by X-ray diffraction,Fourier Transform Infrared Spectroscopy(FT-IR)and FactSage calculation.The results showed that the flow temperature of high ash fusion temperature(AFT)coal decreased below 1380°C when the TDS addition reached 20%−25%,which met the requirements of liquid-slag removal for EFB gasification.With the content of TDS increasing,the formations of low-melting minerals(e.g.,hercynite,anorthite,and albite)decreased AFT.The bridging oxygen bonds of the network structure were destroyed by metal ions(e.g.,Fe^(2+),Ca^(2+),Na^(+)),formation of much non-bridged oxygen(NBO)bonds relaxed the silicate network,thus decreasing the AFT.The formations of NBO bonds were confirmed by gradual decreases in the peak strengths of Si−O−Si and Si−O−Al bonds and intensified the vibration of Fe−O and Si−O−M(M:Ca^(2+)or Na^(+))bonds.FactSage calculation results were in good agreement with the experimental ash fusion behavior.

关 键 词：灰熔融行为 染布厂污泥 高AFT煤 改性机理 

分 类 号：TQ531.9[化学工程—煤化学工程]