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[1]李青松,李国红,王恩元,等.基于经典扩散模型不同粒径粒煤瓦斯扩散特征实验研究[J].中国安全生产科学技术,2018,14(9):44-49.[doi:10.11731/j.issn.1673-193x.2018.09.007]
　LI Qingsong,LI Guohong,WANG Enyuan,et al.Experimental study on gas diffusion characteristics of granular coal with different particle sizes based on classical diffusion model[J].JOURNAL OF SAFETY SCIENCE AND TECHNOLOGY,2018,14(9):44-49.[doi:10.11731/j.issn.1673-193x.2018.09.007]
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基于经典扩散模型不同粒径粒煤瓦斯扩散特征实验研究
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《中国安全生产科学技术》[ISSN:1673-193X/CN:11-5335/TB]

卷:
14
期数:
2018年9期
页码:
44-49
栏目:
学术论著
出版日期:
2018-09-30

文章信息/Info

Title:
Experimental study on gas diffusion characteristics of granular coal with different particle sizes based on classical diffusion model
文章编号:
1673-193X(2018)-09-0044-06
作者:
李青松1; 2; 3; 4; 李国红2; 3; 4; 王恩元1; 段正鹏2; 3; 4
（1.中国矿业大学 安全学院，江苏 徐州 221000；2.贵州省矿山安全科学研究院，贵州 贵阳 550025；3.贵州省煤与瓦斯突出防治工程研究中心，贵州 贵阳 550025；4.贵州煤与瓦斯突出防治煤炭行业工程研究中心，贵州 贵阳 550025）
Author(s):
LI Qingsong1; 2; 3; 4;  LI Guohong2; 3; 4;  WANG Enyuan1;  DUAN Zhengpeng2; 3; 4
(1. School of Safety Engineering, China University of Mining and Technology, Xuzhou Jiangsu 221000, China;2. Guizhou Mine Safety Scientific Research Institute, Guiyang Guizhou 550025, China;3. Guizhou Engineering Research Center for Prevention and Control of Coal and Gas Outburst, Guiyang Guizhou 550025, China;4. Guizhou Coal Industrial Engineering Research Center for Prevention and Control of Coal and Gas Outburst, Guiyang Guizhou 550025, China)
关键词:
扩散模型; 扩散率; 扩散系数; 粒径煤
Keywords:
diffusion model;  diffusion rate;  diffusion coefficient;  grain size coal
分类号:
X936;TD712.3
DOI:
10.11731/j.issn.1673-193x.2018.09.007
文献标志码:
A
摘要:
为了获取多尺度粒煤在不同初始吸附平衡压力条件下的甲烷扩散特征，完成了0.25～1.00 mm，＞1.00～3.00 mm，＞3.00～6.00 mm和＞6.00～10.00 mm这4种粒径粒煤在1.0 和3.0 MPa初始吸附平衡压力下的甲烷扩散实验，并考察了经典扩散模型对各实验在0～10 min，0～60 min，0～180 min时间段的扩散拟合效果。研究结果表明：同实验时间，扩散率表现为随着粒径的减小呈增大趋势，0.25～1.00 mm相较＞6.00～10.00 mm粒径粒煤最大增大了73%；经典扩散模型不适用于描述甲烷在粒煤中的全阶段扩散，粒径越小拟合精度越低，仅对于初始扩散阶段（0～10 min）拟合效果较好；同初始吸附平衡压力，初始扩散系数D值随着粒径的增大呈递增趋势，＞6.00～10.00 mm相较0.25～1.00 mm粒煤扩散系数增大至7倍。不同尺度粒煤的瓦斯扩散特征，为煤层气达产、稳产、增产提供了储层改造方向。
Abstract:
To obtain the methane diffusion characteristics of multiscale granular coal under different initial adsorption equilibrium pressures, the methane diffusion experiments of granular coal with four particle sizes of 0.25～1.00 mm, ＞1.00～3.00 mm, ＞3.00～6.00 mm and ＞6.00～10.00 mm under the initial adsorption equilibrium pressures of 1.0 MPa and 3.0 MPa were carried out, and the fitting effect of diffusion by the classical diffusion model on the experimental data at the time periods of 0～10 min, 0～60 min and 0～180 min were investigated. The results showed that under the same experimental time, the diffusion rate increased with the decrease of particle size, and the maximum increase was 73% for the granular coal with the particle size of 0.25～1.00 mm compared with that of ＞6.00～10.00 mm. The classical diffusion model was not suitable for describing the whole stage diffusion of methane in the granular coal, the smaller the particle size, the lower the fitting accuracy, and the fitting effect was better only for the initial diffusion stage (0～10 min). Under the same initial adsorption equilibrium pressure, the initial diffusion coefficient D increased with the increase of particle size, and the diffusion coefficient of granular coal with the particle size of ＞6.00～10.00 mm increased by 7 times than that of 0.25～1.00 mm. The gas diffusion characteristics of granular coal with different scales provide the direction of reservoir reformation for reaching production target, stabling production and increasing production of coalbed methane.

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备注/Memo

备注/Memo:
收稿日期： 2018-06-15；数字出版日期：2018-09-14
基金项目： 国家自然科学基金项目（51574231）；贵州省科学技术基金项目（黔科合基础［2016］1083）；黔科合重大专项项目（［2018］3003）
作者简介： 李青松，博士研究生，研究员，主要研究方向为煤矿瓦斯治理、煤层气综合开发与利用。
通信作者： 李国红，硕士，高级工程师，主要研究方向为煤矿瓦斯灾害防治、煤矿开采设计。
更新日期/Last Update: 2018-10-09