摘要
为了证实和完善极限粒度理论,制备了煤粒度毫米级至厘米级(>10 mm)的5种粒度煤样,利用H-Sorb 2600T高温高压气体吸附分析仪对不同粒度的煤样进行等温吸附-解吸实验,并采用动扩散系数模型计算了煤粒瓦斯解吸扩散系数,分析不同粒度煤的扩散系数变化特征。研究结果表明:粒度毫米级煤样单位瓦斯解吸量和瓦斯解吸率随粒度的增大呈现逐渐减小的趋势;粒度厘米级煤样单位瓦斯解吸量和瓦斯解吸率随粒度的增大降幅较小;煤粒度在毫米级范围内,初始有效扩散系数D 0e和平均有效扩散系数D ae随粒度的增大快速下降;煤粒度为厘米级时,初始有效扩散系数D 0e和平均有效扩散系数D ae随粒度的增大基本保持不变;极限粒度理论正确可靠,煤的极限粒度小于10 mm。
In order to confirm and improve the theory of limit particle size,five coal samples with different particle sizes from millimeter to centimeter(>10 mm)were prepared.The isothermal adsorption-desorption experiments of coal samples with different particle sizes were carried out by using the H-Sorb 2600T high temperature and high pressure gas adsorption analyzer.The dynamic diffusion coefficient model was used to calculate the gas desorption and diffusion coefficients of coal particles,and the variation characteristics of diffusion coefficients of coal with different particle sizes were analyzed.The results showed that the unit gas desorption amount and gas desorption rate of millimeter-sized coal samples presented a gradually decreasing trend with the increase of particle size,while the unit gas desorption amount and gas desorption rate of centimeter-sized coal sample decreased slightly with the increase of particle size.The initial effective diffusion coefficient D 0e and average effective diffusion coefficient D ae decreased rapidly with the increase of coal particle size in the millimeter range.When the particle size was centimeter,the initial effective diffusion coefficient D 0e and average effective diffusion coefficient D ae basically remained unchanged with the increase of particle size.The theory of limit particle size was correct and reliable,and the limit particle size of coal was less than 10 mm.
作者
韩恩光
刘志伟
冉永进
马树俊
李志强
HAN Enguang;LIU Zhiwei;RAN Yongjin;MA Shujun;LI Zhiqiang(China Coal Technology and Engineering Group Chongqing Research Institute,Chongqing 400037,China;School of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo Henan 454000,China)
出处
《中国安全生产科学技术》
CAS
CSCD
北大核心
2019年第12期83-87,共5页
Journal of Safety Science and Technology
基金
国家“十三五”重点研发计划项目(2018YFC0808001)
关键词
粒度
极限粒度
扩散系数
初始有效扩散系数
瓦斯解吸率
particle size
limit particle size
diffusion coefficient
initial effective diffusion coefficient
gas desorption rate
作者简介
韩恩光,硕士,助理工程师,主要研究方向为瓦斯灾害预测与防治。
