摘要
以球形SiO2颗粒为研究对象搭建高温测试实验台,用光学粒子计数器(OPC)测定了25800℃下的颗粒数及其累计分布,并进行扫描电镜(SEM)和X射线衍射(XRD)分析,研究了高温对颗粒物在线检测结果的影响。结果表明,随加热温度升高,SiO2颗粒的粒径先变小后增大再变小,但颗粒物形状未发生变化;XRD衍射峰强度整体变弱,2θ≈25.5o处的衍射峰宽化并移动,晶胞体积先增大后变小。根据SiO2晶胞体积与晶体介电常数的关系可排除加热使颗粒物粒径变化,温度升高导致SiO2颗粒晶体内部结构变化、晶体折射率变化,使测量结果存在23个粒径通道的误差,影响测量精度。
In high temperature particles on-line detection experiments, with the spherical SiO2 particles as the research object, a high-temperature test bed was set up for this research. By utilizing optical particle counter(OPC), the quantity and cumulative distribution of particles with different particle sizes were measured under the operating condition of 25800℃. The spherical SiO2 dust particles were observed and analyzed by SEM and XRD. Theresults showed that the particle size of spherical SiO2 particles first decreased, then increased and decreased later with the increase of heating temperature, while the shape and size of the particles at the corresponding temperature did not change. The XRD patterns showed that the diffraction intensity of spherical SiO2 particles became smaller, and the diffraction peak was broadened and shifted approximately at 2θ=25.5 o. The unit cell volume of spherical SiO2 particles increased first and then decreased. Thus, a conclusion can be drawn that the connection between SiO2 unit cell volume and crystal dielectric constant led to the change of the internal structure of SiO2 particles, as a result the refractive index of the particles crystal changed, thus resulting in a change in the refractive index, making the measurement results have 2~3 size error and the measurement accuracy was affected.
作者
王明星
吴小林
姬忠礼
卢利锋
宋暄
Mingxing WANG;Xiaolin WU;Zhongli JI;Lifeng LU;Xuan SONG(College of Mechanical and Transportation Engineering,China University of Petroleum,Beijing 102249,China;Beijing Key Laboratory of Process Fluid Filtration and Separation,China University of Petroleum,Beijing 102249,China)
出处
《过程工程学报》
CAS
CSCD
北大核心
2020年第3期324-331,共8页
The Chinese Journal of Process Engineering
基金
国家重点研发计划资助项目(编号:2016YFB0601100)。
关键词
球形SiO2
粒度分布
晶胞体积
介电常数
折射率
在线检测
spherical SiO2
particle size distribution
cell volume
dielectric constant
refractive index
on-line detection
