摘要
采用Washburn毛细管上升法测定了5种不同粒径分布的多喷嘴对置式水煤浆气化细灰的接触角,分析了水煤浆气化细灰的表面基团、无机矿物质晶体质量分数和结晶度等物理化学性质对细灰润湿特性的影响规律。结果表明:多喷嘴对置式水煤浆气化细灰的接触角整体上随着细灰颗粒粒径的增大而减小,但不严格随粒径单调变化,除粒径之外接触角还受其他物理化学性质的影响;以Si-O-Si和-OH为主的表面基团、以石英为主的无机矿物质和粒径是影响颗粒润湿特性的主要因素,三者含量的增加均有利于颗粒润湿性的增强;红外光谱图中Si-O-Si和-OH表面基团峰面积与煤气化细灰接触角之间存在较好的线性关系。
The contact angles of five types of fine ashes with different particle size distributions produced by the gasification of opposed multi-burner coal water slurry were measured by Washburn capillary tube,with the reference solution(n-hexane)for measuring the effective radius.X-ray diffraction and Fourier infrared spectrometer were used to determine the XRD pattern and infrared spectrum of the fine ashes,respectively.The surface groups,crystal mass fraction and crystallinity of inorganic minerals were analyzed in order to determine the influence of physical and chemical properties on their wettability.The results show that the contact angle of the fine ashes decreases as the particle size increases.However,the decreasing trend is not linear with the particle size.In addition,the functional surface groups including Si-O-Si and-OH and inorganic minerals including SiO2 are found to determine the wetting characteristics of the fine ash particles in addition to particle size.A good linearity was determined between the peak area of the Si-O-Si and-OH groups in the infrared spectrum and the contact angle of fine ashes.The wetting contact angle decreases with the increase of peak areas of the functional groups,suggesting that the surface area of Si-O-Si and-OH in the infrared spectrum can be used as a quantitative index to characterize the wettability of fine ashes produced by coal gasification.
作者
牛永健
杨澜
朱诗杰
陈雪莉
NIU Yongjian;YANG Lan;ZHU Shijie;CHEN Xueli(Shanghai Engineering Research Center of Coal Gasification,East China University of Science and Technology,Shanghai 200237,China)
出处
《华东理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2021年第4期408-413,共6页
Journal of East China University of Science and Technology
基金
国家重点研发计划课题(2017YFB0602601)。
关键词
煤气化细灰
润湿性
颗粒粒径
表面基团
无机矿物
coal gasification fine ash
wettability
particle size
surface group
inorganic mineral
