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[1]程小庆,王兆丰,李志强.动扩散系数新模型下不同粒径构造煤的瓦斯扩散特征[J].中国安全生产科学技术,2016,12(6):88-93.[doi:10.11731/j.issn.1673-193x.2016.06.016]
 CHENG Xiaoqing,WANG Zhaofeng,LI Zhiqiang,et al.Features of gas diffusion in tectonic coal with different particle sizes by new model of dynamic diffusion coefficient[J].JOURNAL OF SAFETY SCIENCE AND TECHNOLOGY,2016,12(6):88-93.[doi:10.11731/j.issn.1673-193x.2016.06.016]
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动扩散系数新模型下不同粒径构造煤的瓦斯扩散特征
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《中国安全生产科学技术》[ISSN:1673-193X/CN:11-5335/TB]

卷:
12
期数:
2016年6期
页码:
88-93
栏目:
现代职业安全卫生管理与技术
出版日期:
2016-06-30

文章信息/Info

Title:
Features of gas diffusion in tectonic coal with different particle sizes by new model of dynamic diffusion coefficient
作者:
程小庆1 王兆丰12李志强34
(1.河南理工大学 安全科学与工程学院,河南 焦作454000;2.河南省瓦斯地质与瓦斯治理 重点实验室一省部共建国家重点实验室培育基地,河南 焦作454000; 3.重庆大学 煤矿灾害动力学与控制国家重点实验室, 重庆400030; 4.河南理工大学 中原经济区煤层(页岩)气河南省协同创新中心,河南 焦作454003)
Author(s):
CHENG Xiaoqing1 WANG Zhaofeng1 2 LI Zhiqiang34
(1. School of Safety Science & Engineering, Henan Polytechnic University, Jiaozuo Henan 454000, China; 2. State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Jiaozuo Henan 454000, China; 3. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400030, China; 4. Collaborative Innovation Center of Central Plains Economic Region for Coalbed /Shale Gas, Henan Province, Henan Polytecnnic University, Jiaozuo Henan 454003, China)
关键词:
构造煤扩散率扩散模型扩散系数衰减系数
Keywords:
tectonic coal diffusivity diffusion model diffusion coefficient attenuation coefficient
分类号:
X936
DOI:
10.11731/j.issn.1673-193x.2016.06.016
文献标志码:
A
摘要:
为揭示不同粒径构造煤的瓦斯扩散特征,采用瓦斯解吸仪分别在井下现场和实验室内开展了原煤样和不同粒径的构造煤瓦斯扩散实验,并采用低温氮吸附法测定其孔径分布,采用动扩散系数新扩散模型计算各类扩散实验的初始扩散系数D0及其衰减系数β、有效初始扩散系数De0和有效动扩散系数De(t)。结果表明:各类粒径构造煤的瓦斯扩散率初期增长较快,但衰减迅速。同时刻下,粒径越大,D0越大,β越小,构造煤中孔隙由表及里孔径逐渐缩小,正是这种孔径特征控制了D0和β的大小。同时,粒径越大De0和De(t)越小。与之相反,井下构造煤原煤样具有更小的粒径,致使原煤样的瓦斯扩散速度更快,因此构造煤具有更严重的突出危险性。
Abstract:
In order to reveal the features of gas diffusion in tectonic coal with different particle sizes, the gas diffusion experiments of raw coal sample and tectonic coal with different particle sizes were carried out both in laboratory and underground field by using gas desorption apparatus, and the pore diameter distribution of tectonic coal was measured by using low temperature nitrogen adsorption method. The initial diffusion coefficient D0 and its attenuation coefficient β, the effective initial diffusion coefficient De0 and the effective dynamic diffusion coefficient De(t) of various diffusion experiments were calculated by using the new diffusion model of dynamic diffusion coefficient. The results showed that the gas diffusivity of tectonic coal with different particle sizes presents a faster increase in early stage, but attenuates rapidly. What's more, the lager the particle size, the lager D0 and the smaller β. The pore diameter reduces gradually from surface to center in tectonic coal, and this pore diameter characteristic controls the magnitude of D0 and β. At the same time, the lager the particle size, the smaller both De0 and D(t). On the contrary, the raw coal sample of underground tectonic coal has smaller particle size, which results in the faster gas diffusion speed of raw coal sample, so the tectonic coal has more serious outburst hazard.

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备注/Memo

备注/Memo:
国家自然科学基金项目(51004041);河南理工大学博士基金项目(B2010-35);煤矿灾害动力学与控制国家重点实验室开放课题项目(2011DA105287-KF201313);长江学者和创新团队发展计划项目(PCSIRT1235)
更新日期/Last Update: 2016-06-30