中国安全科学学报 ›› 2022, Vol. 32 ›› Issue (3): 123-130.doi: 10.16265/j.cnki.issn1003-3033.2022.03.017

• 低温环境瓦斯扩散试验及不同模型契合度分析 • 上一篇    下一篇

基于位移信息融合的露天矿边坡动态预警方法

马兴莹1(), 王兆丰1,2,3, 尉瑞4, 周晓庆1, 李乾荣1   

  1. 1河南理工大学 安全科学与工程学院,河南 焦作 454000
    2煤矿灾害预防与抢险救灾教育部工程研究中心,河南 焦作 454000
    3煤炭安全生产与清洁高效利用省部共建协同创新中心,河南 焦作 454003
    4中煤华晋集团有限公司王家岭分公司,山西 运城 043300
  • 收稿日期:2021-12-20 修回日期:2022-02-17 出版日期:2022-08-23 发布日期:2022-09-28
  • 作者简介:

    马兴莹 (1995—),男,甘肃兰州人,硕士研究生,主要研究方向为煤矿瓦斯灾害防治。E-mail:
    王兆丰 教授,

  • 基金资助:
    国家自然科学基金资助(52074107); 河南省高校科技创新团队支持计划项目(171RSTHN030); 河南省高等学校重点科研项目(19B440002); 河南省瓦斯地质与瓦斯治理重点实验室—省部共建国家重点实验室培育基地开放基金资助(WS2018B13)

Gas diffusion test in low temperature environment and analysis on compatibility of different models

MA Xingying1(), WANG Zhaofeng1,2,3, YU Rui4, ZHOU Xiaoqing1, LI Qianrong1   

  1. 1School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo Henan 454000, China
    2MOE Engineering Center of Mine Disaster Prevention and Rescue, Jiaozuo Henan 454000, China
    3State Collaboration Innovation Center of Coal Work Safety and Clean-efficiency Utilization, Jiaozuo Henan 454003, China
    4Wangjialing Branch, China Coal Huajin Group Co., Ltd., Yuncheng Shanxi 043300, China
  • Received:2021-12-20 Revised:2022-02-17 Online:2022-08-23 Published:2022-09-28

摘要:

为了有效治理煤与瓦斯突出灾害,基于瓦斯扩散系数在煤层瓦斯含量测定中的重要性,采用自主研发的含瓦斯煤冷冻响应装置,测定温度为0、-10、-20、-30 ℃,吸附平衡压力为0.5、1.0、1.5 MPa 下的瓦斯解吸扩散量,并对比经典扩散模型和2种动扩散模型与试验数据的契合度。研究结果表明:低温影响煤体表面自由能升高,瓦斯分子热运动能力降低,表现出低温抑制煤中瓦斯解吸扩散;3种扩散模型模拟数据与试验数据对比,2种动扩散模型优于经典扩散模型,且2种动扩散模型中指数函数模型更优于幂函数模型;瓦斯扩散系数受温度影响均经历急速下降和缓慢下降2个阶段。

关键词: 低温环境, 瓦斯解吸扩散, 扩散模型, 契合度, 扩散系数

Abstract:

In order to effectively control coal and gas outburst disasters, given the important role of gas diffusion coefficient in determining coal seam gas content, a self-developed gas-containing coal freezing response device was adopted to measure gas desorption and diffusion capacity at temperature of 0, -10, -20, -30 ℃ and adsorption equilibrium pressure of 0.5, 1.0, and 1.5 MPa. And data of classical diffusion model and two dynamic diffusion models were compared with experimental data. The results show that low temperature affects increase of free energy on coal surface, and thermal movement of gas molecules reduces, indicating that low temperature inhibits gas desorption and diffusion in coal. According to the comparison between simulation data of three diffusion models and experimental data, two dynamic diffusion models are better than classical diffusion model, and their exponential function model is better than power function model. Gas diffusion coefficient undergoes two stages of rapid decline and slow decline under influence of temperature.

Key words: low temperature environment, gas desorption and diffusion, diffusion model, compatibility, diffusion coefficient