煤层原生CO钻孔探测试验

秦汝祥; 徐少伟; 侯树宏; 田文雄; 杨志华; 傅师贵

doi:10.13272/j.issn.1671-251x.2021070043

煤层原生CO钻孔探测试验

doi: 10.13272/j.issn.1671-251x.2021070043

1.
安徽理工大学安全科学与工程学院, 安徽淮南　232001
2.
安徽理工大学煤炭安全精准开采国家地方联合工程研究中心, 安徽淮南　232001
3.
国家能源集团宁夏煤业有限责任公司羊场湾煤矿, 宁夏灵武　751410
4.
宁夏煤炭科学技术研究所有限公司, 宁夏银川　750000

基金项目: 国家自然科学基金资助项目(51874007)。

详细信息

作者简介:
秦汝祥(1975—)，男，江苏高邮人，教授，主要从事矿井通风防灭火技术研究工作，E-mail：309374919@qq.com

中图分类号: TD711.4
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- 被引次数: 0
出版历程
- 收稿日期: 2021-07-15
- 录用日期: 2022-01-03
- 修回日期: 2021-12-29
- 刊出日期: 2022-01-20

Borehole detection test of primary CO in coal seam

1.
School of Safety Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China
2.
National & Local Joint Engineering Research Center of Precision Coal Mining, Anhui University of Science and Technology, Huainan 232001, China
3.
Yangchangwan Coal Mine, CHN Energy Ningxia Coal Industry Co., Ltd., Lingwu 751410, China
4.
Ningxia Coal Science and Technology Research Institute Co., Ltd., Yinchuan 750000, China

摘要

摘要: 当前不少研究均得出煤层赋存原生CO气体的结论，但是未考虑钻孔施工过程中产生CO后被煤体吸附的可能。为探究西北地区易自燃煤层是否存在原生CO的问题，采用原始煤层原位钻孔探测方法进行原生CO探测试验。在未受采动影响的实体煤区域沿巷帮一字排开布置3个测试钻孔，钻孔密封后采用高纯N₂置换密闭气室内气体，采用专用抽气泵抽取钻孔内气体，消除原位探测钻孔施工过程中煤体氧化产生CO对试验结果的影响。在分析煤层原生CO来源可能性及其涌出理论的基础上，探讨了密闭钻孔内气体浓度随时间变化特征，结果表明：密封后钻孔内O₂和CO体积分数随密封时间的延长而迅速降低，12 d后O₂体积分数稳定在2%以下；12 d后CO体积分数低于10⁻¹²，气相色谱仪未检测到CO气体；钻孔内气体主要为N₂。由此推断，待测煤层中无原生CO气体。N₂环境破煤试验和煤样常温恒温氧化试验结果表明，封孔初期检出的CO气体来源于钻孔施工破煤作业。
- 易自燃煤层 /
- 原生CO赋存 /
- 钻孔探测 /
- 原位探测 /
- 吸附/解吸 /
- 常温氧化
Abstract: At present, many studies have come to the conclusion that the coal seam contains primary CO gas, but the possibility of CO being adsorbed by coal after CO generated in drilling construction is not considered. In order to explore whether there is primary CO in spontaneous combustion coal seam in Northwest China, the original coal seam in-situ drilling detection method is used to detect primary CO. Three test boreholes are arranged in a row along the roadway side in the solid coal area not affected by mining. After the boreholes are sealed, high-purity N₂ is used to replace the gas in the closed gas chamber, and the gas in the boreholes is extracted by a special air pump, so as to eliminate the impact of CO generated by coal oxidation on the test results during the construction of in-situ detection boreholes. On the basis of analyzing the source possibility of primary CO in coal seam and its emission theory, the variation characteristics of gas concentration in closed borehole with time are discussed. The results show that volume fraction of O₂ and CO in the sealed borehole decrease rapidly with the extension of sealing time, and the volume fraction of O₂ is stable below 2% after 12 days. After 12 days, the CO volume fraction is lower than 10⁻¹², and no CO gas is detected by gas chromatograp. The gas in the borehole is mainly N₂. It is concluded that there is no primary CO gas in the tested coal seam. The results of coal breaking test in N₂ environment and coal sample oxidation test at normal temperature and constant temperature show that CO gas detected at the initial stage of borehole sealing comes from coal breaking operation in drilling construction.
- spontaneous combustion coal seam /
- primary CO occurrence /
- borehole detection /
- in-situ detection /
- adsorption/desorption /
- normal temperature oxidation

HTML全文

图 1 原生CO探测钻孔

Figure 1. Primary CO detection boreholes

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图 2 原生CO探测钻孔结构

Figure 2. Structure of primary CO detection boreholes

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图 3 探测钻孔密封与气样采集

Figure 3. Detection borehole sealing and gas sample collection

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图 4 探测钻孔气室内气体体积分数变化曲线

Figure 4. Variation curves of gas volume fraction in gas chamber of detection borehole

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图 5 煤样常温氧化产生的CO体积分数变化曲线

Figure 5. Variation curve of CO volume fraction produced by normal temperature oxidation of coal samples

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图 6 煤样不同气氛下破碎产生的CO体积分数变化曲线

Figure 6. Variation curves of CO volume fraction produced by crushing coal samples under different atmospheres

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