Calibration of the cloud and aerosol spectrometer for coal dust composition and morphology
Calibration of the cloud and aerosol spectrometer for coal dust composition and morphology
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DOI：
10.1016/j.apt.2019.05.023
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发表时间：
2019-09-01
影响因子：
5.2
通讯作者：
Mischler, S. E.
中科院分区：
文献类型：
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作者：
Barone, T. L.;Hesse, E.;Mischler, S. E.
云和气溶胶光谱仪 (CAS) 经过校准，可对煤尘进行 CAS 分级，以用于可燃性粉尘控制研究。煤尘尺寸是通过不规则颗粒的光散射理论确定的，该理论在计算煤尘直径时考虑了颗粒组成和形态。将煤尘粒径计算结果与通过旋风分离和喷气筛分产生的测试粉尘进行比较，并通过空气动力粒度仪 (APS) 和计算机控制扫描电子显微镜 (CCSEM) 测量进行表征。对于0.5-32μm范围内的试验粉尘，煤尘粒径分布与旋风分离和筛分粒径一致。对于 3-20 μm 粒径范围，煤尘粒径分布的质量中值直径比 APS 大 14%。考虑到玻璃球的基本校准有 13% 的不确定度，这种差异是合理的。对于 20-32 μm 和 32-45 μm 测试粉尘，质量中值直径与 CCSEM 测量结果分别仅相差 4% 和 5%。总体而言，结果表明测试粉尘尺寸与煤尘计算结果一致。另外，使用传统的球体米氏理论计算，煤尘质量中值直径分别比 APS 和 CCSEM 测量值大 35% 和 40%。由 Elsevier B.V. 代表日本粉末技术学会出版。版权所有。
The cloud and aerosol spectrometer (CAS) was calibrated to enable CAS sizing of coal dust for studies on flammable dust control. Coal dust sizes were determined by light-scattering theories for irregular particles that account for particle composition and morphology in computing coal dust diameters. Coal dust size computations were compared with test dust that was generated by cyclone separation and air-jet sieving and characterized by aerodynamic particle sizer (APS) and computer-controlled scanning electron microscopy (CCSEM) measurements. For test dust in the range of 0.5-32 mu m, coal dust size distributions were consistent with cyclone-separated and sieve-segregated sizes. For the 3-20 mu m size range, the coal dust size distribution had a mass median diameter that was 14% larger than that of the APS. This difference was reasonable considering that the basic calibration for glass spheres had 13% uncertainty. For the 20-32 mu m and 32-45 mu m test dusts, mass median diameters differed from CCSEM measurements by only 4% and 5%, respectively. Overall, the results suggest agreement between test dust sizes and computations for coal dust. Alternatively, using conventional Mie theory computations for spheres, coal dust mass median diameters were 35% and 40% larger than APS and CCSEM measurements, respectively. Published by Elsevier B.V. on behalf of The Society of Powder Technology Japan. All rights reserved.