共查询到19条相似文献,搜索用时 171 毫秒
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煤层中水分对瓦斯具有逐气和封闭双重作用.通过煤层注水,可提高瓦斯抽采效果,同时降低工作面回采期间落煤瓦斯涌出量.小回沟煤矿采用静压注水方式,单孔注水量为16.8 m3,注水时间为4.2 h,注水位置在工作面前方21 m,有效降低了工作面回采时的瓦斯涌出量,确保了矿井安全生产. 相似文献
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设计了煤巷掘进工作面前方煤层注水系统,测定了煤层注水前后工作面前方煤体钻孔中的钻屑量,以及瓦斯突出指标K1和△h2值。结果表明:煤层注水后,钻屑量峰值位置比注水前往深部移动约1m,说明煤体前方应力峰值也向深部移动相应的距离;与注水前相比,注水影响范围内,K1值降低了63.8%,△h2值降低了50%,说明注水有效地降低了煤体的煤与瓦斯突出危险性。 相似文献
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为了控制煤炭开采过程中产生的煤尘,采用煤层注水降尘技术这种相对主动的、积极有效的降尘措施,应用于煤矿生产实践中,改善工人的作业环境及保障矿井的安全生产.通过分析煤层注水机理及注水效果影响因素,结合垞城煤矿92103综采工作面煤层硬度大、注水困难等复杂条件,选择长、短钻孔联合注水方式确定注水参数后进行试验研究,考察煤层注水降尘效果.结果表明:煤层注水后煤样全水分平均为4.10%,煤层新增水分1.32%,工作面主要工作场所降尘率超过65%,同时工作面回风隅角瓦斯浓度下降约20%,后期钻孔煤粉量明显减少,降尘效果显著. 相似文献
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煤层注水消突及治理瓦斯、煤尘技术 总被引:1,自引:0,他引:1
阐述了煤层注水消突及注水治理瓦斯、煤尘的技术原理,介绍了安阳大众煤业有限责任公司回采工作面煤层注水参数及注水工艺,并对注水效果进行了分析.通过煤层注水消突及减尘,消除了瓦斯超限,降低了瓦斯涌出量;改善了井下作业环境,降低了工人的劳动强度. 相似文献
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结合煤层深孔高压注水技术对顺层钻孔的瓦斯抽采机理,对薛湖煤矿2107工作面进行煤层注水工业试验,分析了煤层高压注水后的抽采效果。结果表明,高压注水使煤层裂隙发育充分,煤层透气性及煤体塑性增加;瓦斯抽放日抽采纯量增加一倍,瓦斯抽采效率明显提高;注水后煤体残留的水分也对瓦斯解吸有抑制作用;最终达到防治煤与瓦斯突出的效果,缩短了工作面消突时间,提高了工作面生产效率。 相似文献
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煤层注水在"三软"不稳定厚煤层生产中的应用 总被引:1,自引:0,他引:1
介绍了在厚煤层放顶煤工作面进行长孔、深孔、浅孔的注水情况,总结了通过煤层注水降低产尘量、控制煤层顶板、超前释放煤层瓦斯、提高煤炭采出率等方面的经验。 相似文献
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为了降低九里山矿综采工作面煤尘质量浓度和瓦斯涌出量,根据九里山矿煤层特性,结合16051工作面的现场实际情况,在充分利用瓦斯抽采钻孔的基础上,探索出回风巷长孔低压渗透注水工艺,结合工作面短孔中压注水工艺,建立中、低压综合注水模式,并进行了分区域对比试验,考察了各区域的煤层含水率、煤尘质量浓度和瓦斯浓度。现场应用效果表明:中、低压综合注水效果较好,煤层含水率提高了2.94倍,煤尘质量浓度降低了80%以上,工作面瓦斯均匀释放,回风巷瓦斯浓度下降了30%以上,达到了较好的注水效果。 相似文献
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Coal dust is a primary contributor to underground coal-mining disasters and is also a major factor in adversely affecting the occupational health of mine workers. Pre-wetting the coal seam with water injection is widely considered as one of the effective means of mitigating coal dust generation during mining. Injecting water through inseam long boreholes parallel to the working face is a commonly used technique. However, for most fully-mechanised top-coal caving working faces, inseam gas drainage boreholes are drilled to extract gas from the gassy seam prior to mining. Therefore, there is neither enough time nor space at the working site for an elaborated water injection process. Based on the mining conditions at Panel 9801 of the Yangquan coalfield, this study designed a water injection system through the inseam gas drainage boreholes to control dust arising from the longwall face. Under the influence of abutment pressure, water injection through a set of inseam gas drainage boreholes was experimentally investigated to offset the conflict between water injection and gas drainage in terms of the time and space availability. The relations between the amount of injected water, the injection rate, the seam moisture content and the coal dust level at the working space were investigated. The effect of water injection for dust control at different distances ahead of working face was assessed. With the change of abutment pressure, the effect of water injection to inseam gas drainage and gas emission at working face was revealed and a space-time balance between gas drainage and dust control by water injection was established. The results indicate that under the influence of abutment pressure, water injection through inseam gas drainage boreholes wetted the seam and decreased the dust level at the working face. Water injection only has marginal influence on inseam borehole drainage and has a negligible impact on the gas level produced at the working face. Under the influence of abutment pressure, the optimum area for water injection through the inseam boreholes was the primary fracture opening zone and the secondary fracture development zone. 相似文献
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在综采工作面应用上下巷及瓦斯预抽巷深孔煤层注水结合工作面切眼浅孔注水,形成"网格式"煤层注水,大大提高了注水效果,解决了松软破碎煤层回采期间煤墙片帮严重,煤尘大和瓦斯涌出异常的现象,筑起了"人造煤墙",很好的改善了工作面生产条件,为高效安全生产打下良好基础。 相似文献
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为实现滕东生建煤矿大采深、低孔隙率条件下的煤层有效注水,进而降低采煤工作面粉尘浓度,首先,基于统一的非饱和-饱和流动的连续方程和应力平衡微分方程,从定性角度分析了煤层注水渗流过程的内在规律;其次,结合矿井实际地质情况和上述的煤层注水渗流方程,利用COMSOL Multiphysics软件模拟了长度为50 m与80 m钻孔的注水渗流压力场分布;然后,结合数值模拟结论,选择80 m长度的钻孔与相应的动静压混合式注水技术参数,并在3下105工作面进行实际施工应用。在实施注水工艺后,现场监测的工作面全尘平均降尘率为65.9%,呼尘平均降尘率为60.6%,有效地降低了粉尘浓度。所得研究结论可为相似煤矿煤层注水工艺的实施提供借鉴。 相似文献
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为解决大采高工作面粉尘大的问题,长平矿4311大采高综采工作面试验静动压结合煤层注水技术、红外追机喷雾、采煤机远程雾流降尘、粉尘浓度超限自动喷雾、除尘室等综合防尘措施,有效解决了大采高工作面粉尘大的问题,改善了工人的作业环境。 相似文献