煤层膨胀增透材料放热对煤体影响范围研究

为了研究煤层膨胀增透材料水化反应放热对煤体的作用范围,通过自制的实验装置测定了膨胀材料的膨胀压力及反应温度随时间的变化数据,并采用数值模拟分析了膨胀材料在升温与降温阶段,对钻孔周围煤体的温度影响规律及影响范围.研究结果表明:煤层膨胀增透材料水化反应产生的最大膨胀压力约为47 MPa,最高水化反应温度为103.5℃;膨胀...     

Carbon monoxide adsorptive capability of low rank coal’s maceral

The centrifugal separation with gravity experiment was made for getting every pure macerals like inertinite and vitrinite, and the isothermal adsorption tests of pure maceral are carried out at 30, 40, 50, 55, 60, 65 °C, respectively, after analyzing the proximate, element and maceral of coal samples, which was aimed to study the CO adsorptive capability of every maceral of low rank coal at difference temperature and pressure. The results show that the adsorption isotherm of CO can be described by Langmuir equation because it belongs to the Type I adsorption isotherm at low temperature(T⩽50 °C), and the temperature effect on coal adsorption is greater than of pressure in lower temperature and pressure area; what’s more, the relationship is linear between the coal adsorption quantity of CO and the pressure at high temperature(T>50 °C), it can be described by Henry equation(Q=KP), which increases with pressure. Both temperature and pressure has great influence on CO adsorptive capability of low rank coals, especially the temperature’s effect is so very complex that the mechanism need to study further. At the same time, the volatile matter, inertinite, oxygen-function groups and negative functional groups are high popularly in low rank coal samples, especially, the content of hydroxide(-OH) has great influence on CO adsorption in that the inertinite has stronger effect than vitrinite on adsorptive capability of low rank coal samples, the result is same to the research on CH₄ adsorption. Supported by the National Natural Science Foundation of China (50474080); Educational Department Foundation for Returnee     

赵各庄矿大倾角厚煤层综采放顶煤开采技术

论文介绍了开滦(集团)赵各庄矿业公司大倾角厚煤层采用综采放顶煤的采煤方法,总结了在千米深度大倾角厚煤层的条件下采用此项技术的成功运用经验,说明此项技术在经济上合理、技术上先进、安全上可靠,可为同类矿井借鉴。     

钱家营矿瓦斯抽采优化措施分析与研究

从钱家营矿工作面瓦斯抽采效果分析入手,对工作面煤层采取平行钻孔预抽,掘进工作面边掘边抽相结合,上隅角安装气动风机和风帐,同时配合原有采空区瓦斯处理方法,综合治理工作面瓦斯;采用二次封孔工艺,以提高瓦斯抽采量等措施解决该矿瓦斯抽采问题。     

高压小射流破煤力学分析及防突机理研究

运用ANSYS/LS-DYNA模拟分析高压小射流冲击破碎煤体的力学过程,并研究其防治突出机理,验证了高压小射流在工作面煤体中形成超前槽洞,促使煤体暴露面积增大,煤层内部卸压,为瓦斯释放和瓦斯流动创造了条件。此外,在地应力的作用下,槽孔周围的煤体会向槽孔空间移动,进一步扩大槽孔卸压与瓦斯排放的范围,从而消除控制范围内煤体的突出潜能。     

新型钻屑粒度分级除尘装置的研制

简述了一种新型钻屑粒度分级除尘装置研制的目的和意义，介绍了装置的结构及工作原理，并对该装置进行了试验分析。     

干式钻孔除尘装置研究的设想

概括地总结了干式钻孔除尘装置的研究现状，针对现有装置存在的问题，对今后的研究工作提出了新的设想。     

轻放工作面仰斜开采安全技术探讨

轻型放顶煤是一种高产高效的开采工艺,但轻放工作面的角度不易超过12°,煤层不易太软也不易太硬。通过开滦集团范各庄矿业公司3081N轻放工作面的实践研究,摸索出了大倾角仰斜开采的规律,进一步完善了轻放工作面的回采工艺。     

矿井通风能力核定中伪倾斜柔性掩护支架工作面需风量分析

伪倾斜柔性掩护支架采煤方法是开采急倾斜煤层的主要方法之一,文章结合柔性掩护支架采煤方法的特点,确定了工作面的有效通风断面和所需的基本风量,为矿井通风系统能力核定提供了参考依据。     

承德某低品位金矿浮选试验

为合理开发承德某低品位难选金矿进行了一系列选矿试验研究。试验结果表明:在磨矿细度为-0.074 mm 65%、pH值为8.5、丁基黄药用量为140 g/t、丁胺黑药用量为50 g/t、2#油用量为60 g/t、粗选时间为10 min的条件下,经1次磨矿、1段粗选、2次扫选、2次精选,可获得品位为32.66 g/t、产率为1.27%、回收率为49.38%的金精矿。