压裂煤层大采高综采提高块煤率工艺研究
发布时间：2018-10-09 19:06
【摘要】：鄂尔多斯侏罗纪煤田是国家级煤炭化工基地,煤层开采条件好,煤质优良,是我国煤炭机械化开采的集中区。生产中,由于煤层硬厚,裂隙不发育,采煤机截割能耗大,截煤块度小,粉煤量过大,造成污染严重,生产安全环境差。基于实际中超前水力压裂技术对硬厚煤层截割性质的改造形成的压裂煤层,本文通过现场研究、实验室实验以及数值模拟分析等综合方法,对压裂煤层综采工作面煤壁的裂隙分布、压裂煤层的截割工艺与参数进行了研究。主要研究内容与取得的结论如下:(1)通过现场测量压裂煤层煤壁的裂隙分布规律,采用分形理论,研究了煤壁裂隙的分形规律,得出压裂煤层煤壁裂隙与分形维数的变化关系;给出了不同压裂煤层条件下煤体物理力学性质参数以及硬煤截割阻抗参数的分形演化规律。(2)基于煤层压裂模型和采煤机割煤形式分析,建立了压裂煤层截割力学模型;根据压裂煤层截割力学模型简化分析,建立了煤壁截割水平楔入力T和破裂面上撬动力F的计算表达式。采用FLAC3D数值模拟软件,模拟不同压裂煤层条件下,最大截割深度、崩落线的长度及范围的变化趋势。通过数值模拟和理论分析,建立了压裂煤层切削面积表达式,并得出由未压裂区到双排孔压裂区切削面积逐渐增大、块煤率逐渐增大的变化规律。(3)对压裂煤层综采工作面,从采煤机割煤、滚筒装煤、刮板运输机运煤等综采工艺进行了研究,得出适合压裂煤层的综采进刀方式、采煤机牵引速度、滚筒转速等工艺参数。将研究结果应用于5米采高综采工作面开采实际,研究得到:采煤机的最佳进刀方式为双向割煤端头斜切进刀;采煤机牵引速度优化后的合理取值范围为8.5～9.2m/min,压裂后采煤机的牵引速度比原始煤层提高了 3.4%～12.1%,滚筒转速优化后减小到28.78r/min,减小了 10.51%。压裂煤层的综采日循环增加1.2刀,工作面块煤率平均提高了 18.7%,粉尘浓度降低了约45.4%。
[Abstract]:Jurassic coal field in Ordos is a national coal chemical base with good coal mining conditions and good coal quality. It is a centralized area for mechanized coal mining in China. In production, the coal seam is hard and thick, the crack is not developed, the cutting energy consumption of shearer is large, the cut coal block is small, the amount of pulverized coal is too large, the pollution is serious and the production safety environment is poor. Based on the fracturing coal seams formed by the modification of cutting properties of hard and thick coal seams by the advanced hydraulic fracturing technology in practice, the comprehensive methods such as field research, laboratory experiments and numerical simulation analysis are adopted in this paper. The fracture distribution of coal wall, cutting technology and parameters of fracturing coal seam in fully mechanized coal face are studied. The main research contents and conclusions are as follows: (1) through the field measurement of fracture distribution law of fractured coal seam wall, using fractal theory, the fractal law of coal wall crack is studied, and the relationship between fracture and fractal dimension of fractured coal seam is obtained. The fractal evolution rules of physical and mechanical parameters of coal body and impedance parameters of hard coal cutting under different fracturing coal seam conditions are given. (2) based on the fracturing model of coal seam and the analysis of coal cutting form of shearer, the cutting mechanics model of fracturing coal seam is established. Based on the simplified analysis of cutting mechanics model of fractured coal seam, the expressions of horizontal wedge force T for cutting coal wall and force F for prying on fracture surface are established. The FLAC3D numerical simulation software is used to simulate the variation trend of maximum cutting depth, length and range of caving line under different fracturing coal seam conditions. Through numerical simulation and theoretical analysis, the formula of cutting area of fracturing coal seam is established, and the variation law of cutting area and block coal rate increasing gradually from non-fracturing area to double-row hole fracturing area is obtained. (3) for fully mechanized mining face of fracturing coal seam, Based on the research of fully mechanized coal mining technology such as cutting coal by shearer, loading coal by drum and transporting coal by scraper conveyer, the technological parameters, such as feed mode of fully mechanized coal mining, traction speed of shearer and rotational speed of roller, which are suitable for fracturing coal seam, are obtained. The research results are applied to the mining practice of 5 meters fully mechanized mining face. It is concluded that the best feed mode of the shearer is the oblique cutting cutter at the end of two-way cutting coal; The reasonable value of the optimized traction speed of shearer is 8.5 ~ 9.2 m / min. After fracturing, the traction speed of shearer is increased by 3.4% and 12.1m / min than that of the original coal seam, and the drum speed is reduced to 28.78 r / min and 10.51 / min, respectively. The daily circulation of fully mechanized coal in fracturing coal seam is increased by 1.2 knife, the average coal rate of working face is increased by 18.7, and the dust concentration is reduced by about 45.4%.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD823.97
本文编号：2260446
[Abstract]:Jurassic coal field in Ordos is a national coal chemical base with good coal mining conditions and good coal quality. It is a centralized area for mechanized coal mining in China. In production, the coal seam is hard and thick, the crack is not developed, the cutting energy consumption of shearer is large, the cut coal block is small, the amount of pulverized coal is too large, the pollution is serious and the production safety environment is poor. Based on the fracturing coal seams formed by the modification of cutting properties of hard and thick coal seams by the advanced hydraulic fracturing technology in practice, the comprehensive methods such as field research, laboratory experiments and numerical simulation analysis are adopted in this paper. The fracture distribution of coal wall, cutting technology and parameters of fracturing coal seam in fully mechanized coal face are studied. The main research contents and conclusions are as follows: (1) through the field measurement of fracture distribution law of fractured coal seam wall, using fractal theory, the fractal law of coal wall crack is studied, and the relationship between fracture and fractal dimension of fractured coal seam is obtained. The fractal evolution rules of physical and mechanical parameters of coal body and impedance parameters of hard coal cutting under different fracturing coal seam conditions are given. (2) based on the fracturing model of coal seam and the analysis of coal cutting form of shearer, the cutting mechanics model of fracturing coal seam is established. Based on the simplified analysis of cutting mechanics model of fractured coal seam, the expressions of horizontal wedge force T for cutting coal wall and force F for prying on fracture surface are established. The FLAC3D numerical simulation software is used to simulate the variation trend of maximum cutting depth, length and range of caving line under different fracturing coal seam conditions. Through numerical simulation and theoretical analysis, the formula of cutting area of fracturing coal seam is established, and the variation law of cutting area and block coal rate increasing gradually from non-fracturing area to double-row hole fracturing area is obtained. (3) for fully mechanized mining face of fracturing coal seam, Based on the research of fully mechanized coal mining technology such as cutting coal by shearer, loading coal by drum and transporting coal by scraper conveyer, the technological parameters, such as feed mode of fully mechanized coal mining, traction speed of shearer and rotational speed of roller, which are suitable for fracturing coal seam, are obtained. The research results are applied to the mining practice of 5 meters fully mechanized mining face. It is concluded that the best feed mode of the shearer is the oblique cutting cutter at the end of two-way cutting coal; The reasonable value of the optimized traction speed of shearer is 8.5 ~ 9.2 m / min. After fracturing, the traction speed of shearer is increased by 3.4% and 12.1m / min than that of the original coal seam, and the drum speed is reduced to 28.78 r / min and 10.51 / min, respectively. The daily circulation of fully mechanized coal in fracturing coal seam is increased by 1.2 knife, the average coal rate of working face is increased by 18.7, and the dust concentration is reduced by about 45.4%.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD823.97
【参考文献】
相关期刊论文 前10条
1 邓广哲;齐晓华;王雷;;水压致裂提高块煤率的机理及应用[J];西安科技大学学报;2017年02期
2 张北平;贾秀华;;采煤机截割滚筒设计方法的研究[J];机电产品开发与创新;2016年04期
3 徐路;;薄煤层采煤机参数对块煤率的影响分析[J];陕西煤炭;2016年03期
4 杨正民;王春艳;;提高煤炭开采块煤率的技术措施[J];煤炭技术;2016年04期
5 杨永红;;大采高综采采煤工艺适用条件研究[J];山东煤炭科技;2015年07期
6 邓广哲;王有熙;;煤层定向水压致裂机理研究[J];西安科技大学学报;2014年06期
7 杜可;;采煤机滚筒截齿布置对块煤率的影响[J];煤矿机电;2014年04期
8 康红普;冯彦军;;定向水力压裂工作面煤体应力监测及其演化规律[J];煤炭学报;2012年12期
9 于斌;段宏飞;;特厚煤层高强度综放开采水力压裂顶板控制技术研究[J];岩石力学与工程学报;2014年04期
10 郭卫;张武刚;赵栓峰;王育龙;;不同工况下采煤机滚筒截割阻力矩的仿真[J];煤矿机械;2014年04期
相关博士学位论文 前1条
1 刘送永;采煤机滚筒截割性能及截割系统动力学研究[D];中国矿业大学;2009年
相关硕士学位论文 前5条
1 白文勇;煤层水压致裂机理数值模拟研究[D];西安科技大学;2016年
2 邬黔凤;采煤机截割滚筒结构参数的优化[D];太原理工大学;2015年
3 郭会珍;滚筒式采煤机截割部动力学特性研究[D];中国矿业大学;2014年
4 薛佳鹏;采煤机滚筒截割过程运动参数匹配研究[D];太原理工大学;2014年
5 姬国强;采煤机镐形截齿截割过程的计算模拟[D];太原理工大学;2008年
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