摘要
本文提出了一种测量煤焦粒燃烬时间的方法来确定空气在煤灰球中的等效扩散系数。由于煤焦粒的燃烬时间的测定较准确,因此所得之等效扩散系数较可靠。测量结果表明,空气在煤灰球中的等效扩散系数随煤中灰份的含量的增加呈单调下降的关系,并给出了它们之间的通用关系式。
A method is presented for detemining the equivalent mass diffusivity, De,of air within a porous coal-ash particle by measuring the burnout time of the coal char particle. Because the measurement of the burnout time of a coal char particle is easy and accurate, the data of the equivalent mass diffusivities so obtained should be reliable. The experimental results show the measured value of De decreases with increasing ash content, and a relationship between them is derived. Comparisons of calculated burning rates of the large char particles of high ash content with the corresponding experimental results show that the values of De obtained by this approach are reasonable.
出处
《燃烧科学与技术》
CAS
CSCD
1995年第3期191-195,共5页
Journal of Combustion Science and Technology
基金
国家攀登计划资助
关键词
空气
等效扩散系数
煤灰球
燃烬时间
测量
Equivalent diffusivity of air, Coal-ash particle, Burnout time