近距离煤层群联合开采火区“三位一体”治理技术

王帅

doi:10.13347/j.cnki.mkaq.20230992

近距离煤层群联合开采火区“三位一体”治理技术

王帅^{1, 2,}

1.
中煤科工集团沈阳研究院有限公司，辽宁抚顺 113122
2.
煤矿安全技术国家重点实验室，辽宁抚顺 113122

基金项目: 国家自然科学基金面上资助项目（52174230）；辽宁省自然科学基金面上资助项目（2023-MS-355）

详细信息

作者简介:
王　帅（1990—），男，辽宁鞍山人，副研究员，硕士，主要从事煤火与瓦斯灾害防治研究工作。E-mail：wangshuai_xust@163.com

中图分类号: TD75⁺2.2
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出版历程
- 收稿日期: 2023-07-13
- 修回日期: 2023-07-28
- 刊出日期: 2024-03-19

“Trinity” treatment technology for fire area of joint mining in close coal seam groups

WANG Shuai^{1, 2,}

1.
China Coal Technology & Engineering Group Shenyang Research Institute, Fushun 113122, China
2.
State Key Laboratory of Coal Mine Safety Technology, Fushun 113122, China

摘要

摘要:
针对近距离煤层群开采期间的自然发火防治难题，以新维煤矿2110、3108工作面断层区域火点处置为例，通过实验研究与现场实践相结合的手段，开展隐蔽火点的探测与综合治理技术研究。3号煤层自然发火模拟实验结果表明：CO、C₂H₄体积分数与煤温呈二次函数关系，可用于煤层自然发火预测预报；氧气体积分数的降低可以有效抑制煤自燃氧化进程，氧气体积分数为7%时最为明显，因此将其设为3号煤层自然发火的临界氧气体积分数。通过自燃隐患分析结合钻孔探查划定了3110轨道巷以西长80 m、宽10 m的F₉断层区域为自然发火隐患区域，并提出以注浆降温为先导，以注胶堵漏为核心，以注氮阻爆为手段的液-胶-气“三位一体”的火区治理思路，累计向隐患区域注浆180 t、注胶504 m³，2110工作面采空区注氮流量保持在810 m³/h，实现了火区的有效治理，保障了2个工作面的顺利启封与安全回采。
- 近距离煤层 /
- 自然发火 /
- 火区精准探查 /
- 火区治理 /
- 液-胶-气“三位一体” /
- 无机复合胶体
Abstract:
In view of the problem of spontaneous combustion prevention and control during the mining of close coal seam groups, taking the fire point disposal in the fault area of 2110 and 3108 working faces of Xinwei Coal Mine as an example, the detection and comprehensive treatment technology of hidden fire points was carried out by combining experimental research and field practice. The results of the simulation experiment of spontaneous combustion in 3^# coal seam show that the volume fraction CO and C₂H₄ is a quadratic function relationship with coal temperature, which can be used for forecasting of spontaneous combustion in coal seam. The decrease of oxygen volume fraction can effectively inhibit the spontaneous combustion oxidation process of coal, and it is most obvious when the oxygen volume fraction is 7%, so it is set as the critical oxygen volume fraction of the spontaneous combustion of 3^# coal seam. Through the analysis of spontaneous combustion hidden dangers combined with drilling exploration, the F₉ fault area with 80 m longth and 10 m width in the west of 3110 track lane was delineated as a spontaneous combustion hidden danger area, and a fire area treatment idea of liquid-colloid-gas “trinity” with grouting and cooling as the guide, rubber injection plugging as the core, and nitrogen injection and explosion prevention as the means was proposed, and a total of 180 t of cement slurry and 504 m³ of colloidal injection were injected into the hidden danger area, and the nitrogen injection flow rate in the goaf area of 2110 working face was maintained at 810 m³/h, which realized the effective treatment of the fire area. It ensures the smooth unsealing and safe recovery of the two working faces.
- closed distance coal seams /
- spontaneous combustion /
- accurate detection of fire zone /
- fire zone treatment /
- liquid-colloid-gas “trinity” /
- inorganic composite colloid

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图 1 2110与3108工作面相对位置关系图

Figure 1. Relative position of 2110 working face and 3108 working face

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图 2 CO体积分数与煤温关系曲线

Figure 2. Relationship between CO volume fraction and coal temperature

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图 3 C₂H₄体积分数与煤温关系曲线

Figure 3. Relationship between C₂H₄ volume fraction and coal temperature

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图 4 不同O₂体积分数下煤体热力学特性曲线

Figure 4. Thermodynamic characteristics of different oxygen volume fractions

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图 5 隐患区域钻孔探查示意图

Figure 5. Schematic diagram of drilling layout in hidden danger area

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图 6 注浆、注胶钻孔平面布置图

Figure 6. Grouting and cementing drilling plane layout

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表 1 探火孔气体观测结果

Table 1 Gas observation results

钻孔编号	φ（CO）/10⁻⁶	φ（O₂）/%	φ（CH₄）/%
1-1^#	140	16.2	1.2
1-2^#	189	15.5	1.8
1-3^#	352	15.8	2.7
1-4^#	5	16.2	1.5
2-1^#	131	16.2	1.3
2-2^#	232	16.1	1.5
2-3^#	253	15.8	1.9
2-4^#	2	16.4	1.2

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表 2 井下各注氮地点及注氮流量

Table 2 Nitrogen injection location and flow rate of nitrogen injection in each well

注氮地点	流量/（m³·h⁻¹）
2110轨道巷埋管	600
11号瓦斯抽放石门探火孔	210
3108轨道巷密闭	200
3108运输巷密闭	100

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