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不同粒径混合煤样瓦斯解吸动力特性研究

马兴莹 龚选平 成小雨 程成 李德波

马兴莹,龚选平,成小雨,等. 不同粒径混合煤样瓦斯解吸动力特性研究[J]. 工矿自动化,2023,49(8):142-147.  doi: 10.13272/j.issn.1671-251x.2022110069
引用本文: 马兴莹,龚选平,成小雨,等. 不同粒径混合煤样瓦斯解吸动力特性研究[J]. 工矿自动化,2023,49(8):142-147.  doi: 10.13272/j.issn.1671-251x.2022110069
MA Xingying, GONG Xuanping, CHENG Xiaoyu, et al. Study on gas desorption dynamic features of mixed coal samples with different particle sizes[J]. Journal of Mine Automation,2023,49(8):142-147.  doi: 10.13272/j.issn.1671-251x.2022110069
Citation: MA Xingying, GONG Xuanping, CHENG Xiaoyu, et al. Study on gas desorption dynamic features of mixed coal samples with different particle sizes[J]. Journal of Mine Automation,2023,49(8):142-147.  doi: 10.13272/j.issn.1671-251x.2022110069

不同粒径混合煤样瓦斯解吸动力特性研究

doi: 10.13272/j.issn.1671-251x.2022110069
基金项目: 安徽省高校自然科学研究重点资助项目(KJ2021A0459)。
详细信息
    作者简介:

    马兴莹(1995—),男,甘肃兰州人,硕士研究生,研究方向为矿井瓦斯防治,E-mail:1139741752@qq.com

  • 中图分类号: TD712

Study on gas desorption dynamic features of mixed coal samples with different particle sizes

  • 摘要: 目前关于瓦斯解吸动力特性的研究主要集中在单一粒径煤样,而对于不同粒径混合煤样瓦斯解吸动力特性的研究较少。针对该问题,利用含瓦斯煤多场耦合渗流解吸实验系统,将(0,0.25)mm、[0.25,0.5)mm、[0.5,1] mm 3种粒径煤样按照不同比例混合,开展了不同粒径混合煤样瓦斯解吸实验,分析了不同粒径煤样占比条件下的瓦斯解吸量、扩散系数及解吸衰减系数等瓦斯解吸动力学参数变化特征。结果表明:① 不同粒径混合煤样瓦斯解吸过程中,前期影响瓦斯解吸量的主要因素是粒径大小,后期影响瓦斯解吸量的主要因素是煤样中不同粒径煤样占比大小;小粒径煤颗粒占比越大,煤样瓦斯解吸量越大。② 不同粒径混合煤样瓦斯扩散系数具有时变性,随着瓦斯解吸时间增加,瓦斯扩散系数呈衰减态,最终趋近0;初始瓦斯扩散系数随小粒径颗粒煤占比的增加而减小;③ 小粒径颗粒煤占比越大,瓦斯解吸衰减系数越大。因此,在井下瓦斯含量测定过程中,获取的煤样中应尽可能提高大粒径颗粒煤的占比,以降低取样过程中瓦斯损失量,提高瓦斯含量测定的准确度。

     

  • 图  1  图1 含瓦斯煤多场耦合渗流解吸实验系统

    Figure  1.  Coal containing gas multi-field coupling seepage desorption experiment system

    图  2  不同粒径混合煤样瓦斯解吸量随时间变化曲线

    Figure  2.  Variation curves of gas desorption of mixed coal samples with different particle sizes under different time

    图  3  不同粒径混合煤样瓦斯扩散系数随时间变化曲线

    Figure  3.  Variation curves of diffusion coefficient of mixed coal samples with different particle sizes under different time

    图  4  不同粒径混合煤样瓦斯解吸衰减系数变化曲线

    Figure  4.  Variation curves of desorption attenuation coefficient of mixed coal samples with different particle sizes under different time

    表  1  煤样基本物性参数

    Table  1.   Basic physical property parameters of coal samples

    破坏类型瓦斯放散初速度/mmHg水分/%灰分/%挥发分/%吸附常数a/(mL·g−1)吸附常数b/MPa−1孔隙率/%
    Ⅱ,Ⅲ类8.740.558.4817.0829.240.954.20
    下载: 导出CSV

    表  2  不同粒径混合煤样

    Table  2.   Mixed coal samples with different particle sizes

    煤样编号粒径占比/%
    (0,0.25) mm[0.25,0.5) mm[0.5,1] mm
    D100100
    D201000
    D310000
    H19532
    H280155
    H380515
    下载: 导出CSV

    表  3  不同粒径混合煤样瓦斯扩散系数

    Table  3.   Diffusion coefficients of mixed coal samples with different particle sizes

    时间/s瓦斯扩散系数/(m2·s−1
    D1D2D3H1H2H3
    156.87×10−115.01×10−111.20×10−113.14×10−115.84×10−116.50×10−11
    603.24×10−112.32×10−115.41×10−121.44×10−112.73×10−113.07×10−11
    1202.22×10−111.58×10−113.63×10−129.65×10−121.86×10−112.10×10−11
    1801.78×10−111.27×10−112.88×10−127.66×10−121.49×10−111.69×10−11
    2401.53×10−111.08×10−112.44×10−126.51×10−121.27×10−111.44×10−11
    3001.35×10−119.54×10−122.14×10−125.74×10−121.13×10−111.28×10−11
    4201.13×10−117.92×10−121.77×10−124.74×10−129.36×10−121.07×10−11
    5409.82×10−126.89×10−121.53×10−124.11×10−128.15×10−129.29×10−12
    6608.81×10−126.17×10−121.36×10−123.67×10−127.30×10−128.33×10−12
    7808.05×10−125.63×10−121.24×10−123.33×10−126.66×10−127.61×10−12
    9007.45×10−125.19×10−121.14×10−123.07×10−126.16×10−127.04×10−12
    12006.37×10−124.43×10−129.66×10−132.61×10−125.26×10−126.02×10−12
    15005.64×10−123.91×10−128.50×10−132.30×10−124.66×10−125.34×10−12
    2 0004.83×10−123.34×10−127.20×10−131.95×10−123.97×10−124.56×10−12
    下载: 导出CSV
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  • 收稿日期:  2022-11-17
  • 修回日期:  2023-08-11
  • 网络出版日期:  2023-09-04

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