[1]罗振敏,郝 苗,苏 彬,等.采空区瓦斯运移规律实验及数值模拟[J].西安科技大学学报,2020,(01):31-39.
 LUO Zhen-min,HAO Miao,SU Bin,et al.Experiments and numerical simulation researchon gas migration in goaf[J].Journal of Xi'an University of Science and Technology,2020,(01):31-39.
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采空区瓦斯运移规律实验及数值模拟(/HTML)
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西安科技大学学报[ISSN:1672-9315/CN:61-1434/N]

卷:
期数:
2020年01期
页码:
31-39
栏目:
出版日期:
2020-02-15

文章信息/Info

Title:
Experiments and numerical simulation researchon gas migration in goaf
文章编号:
1672-9315(2020)01-0031-09
作者:
罗振敏1234郝 苗1234苏 彬1234倪 行1234
(1.西安科技大学 安全科学与工程学院,陕西 西安 710054; 2.西安科技大学 西部矿井开采及灾害防治教育部重点实验室,陕西 西安710054; 3.西安科技大学 西部煤矿安全教育部工程研究中心,陕西 西安 710054; 4.陕西省工业过程安全与应急救援工程技术研究中心,陕西 西安 710054)
Author(s):
LUO Zhen-min1234HAO Miao1234SU Bin1234 NI Xing1234
(1.College of Safety Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,China; 2.Key Laboratory of Western Mine Exploitation and Hazard Prevention,Ministry of Education,Xi'an University of Science and Technology,Xi'an 710054,China; 3.The Western Coal Mine Safety Engineering Research Center of the Ministry of Education,Xi'an University of Science and Technology,Xi'an 710054,China; 4.Shaanxi Engineering Research Center for Industrial Process Safety & Emergency Rescue,Xi'an 710054,China)
关键词:
安全科学与工程 采空区 瓦斯运移规律 通风风速 氧化升温 封闭
Keywords:
safety science and engineering goaf gas migration wind speed oxidation heating sealing
分类号:
TD 712
文献标志码:
A
摘要:
为研究采空区瓦斯运移规律,以贵州某矿P41104工作面为研究对象,搭建了三维采空区气体运移综合实验台,应用Fluent数值模拟软件,从通风风速、遗煤氧化升温和高温封闭这3个方面对U型通风方式下的采空区瓦斯分布情况进行研究。结果表明:当采空区通风风速从1.25 m/s增大到1.50 m/s时,进风巷的瓦斯浓度下降4%左右,回风巷的瓦斯浓度上升2%左右,增大通风风速在一定程度上可以降低采空区瓦斯浓度,但对采空区深部空隙率较小的地方基本上没有起到作用; 当采空区局部遗煤氧化升温后,随着温度的升高,瓦斯浓度梯度也在上升,在采空区内走向上和倾向上瓦斯浓度分布没有太明显的变化; 当对采空区封闭时间延长时,采空区倾向上瓦斯分布梯度逐渐消失,瓦斯受到浓度差的作用,在垂直方向上升较快,当封闭时间长达3 h后,在各个方向上的浓度梯度逐渐消失,整个采空区瓦斯浓度最终趋于平衡状态; 相似实验和数值模拟的结果基本上吻合。以上结论为解决综采工作面瓦斯超限和防止采空区遗煤氧化升温的治理提供重要指导意义。
Abstract:
In order to obtain the gas migration laws in the goaf,taking No.P41104 working face of Guizhou Mining Area as the research object,the gas concentration distribution rules parameters in the goaf with U-shape ventilation system were studied from three aspects:wind speed,coal oxidation heating and sealing conditions by setting up the three dimensional gas migration comprehensive experimental platform and using the Fluent numerical simulation software.The results show that with the increase of the wind speed from 1.25 m/s to 1.5 m/s,the gas concentration in the intake airway decreases by about 4%,and return air gas concentration increases by about 2%.Increasing the wind speed can reduce the gas concentration in the goaf to a certain extent,but it has no effect on the area with small air void ratio in the deep part of the goaf.When the coal in the goaf is oxidized,the gas concentration gradient also rises with the increase of temperature,and there is no obvious change along the strike and the tendency in the goaf; with the increase of the sealing time of the goaf,the gas distribution gradient tends to disappear gradually,the gas is affected by the concentration difference and rises rapidly in the vertical direction.When the sealing time is up to 3 hours,the concentration gradient in each direction gradually disappears,and the gas concentration in the whole goaf eventually tends to balance. Similar experiments were in agreement with numerical simulation results.The above conclusions provide a guiding significance for solving the gas over-run of the fully-mechanized coal mining face and preventing the oxidation of the coal in the goaf.

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备注/Memo

备注/Memo:
收稿日期:2019-09-04 责任编辑:杨泉林
基金项目:国家自然科学基金(51774233,51604218,51974235); 陕西省自然科学基金(2018JZ5007,2018JM5121); 国家重点研发计划(2018YFC0807900)
通信作者:张玉涛(1982-),男,山东烟台人,博士,教授,E-mail:ytzhang@xust.edu.cn
更新日期/Last Update: 2020-02-15