黄白茨矿1295综采工作面瓦斯抽放技术研究

发布时间：2018-05-21 03:24

本文选题：瓦斯抽放 + 数值分析　；参考：《内蒙古科技大学》2013年硕士论文

【摘要】：由于单纯依靠通风并不能彻底解决黄白茨矿1295综采工作面瓦斯超限的问题，所以可以采用瓦斯抽放的措施来解决该工作面瓦斯超限的问题。对瓦斯抽放的研究，归根到底就是对瓦斯抽放参数的研究。本论文正是基于这一点，采用理论分析计算与数值模拟相结合的方法，对1295综采工作面瓦斯抽放参数进行了研究。首先在黄白茨矿12#煤层现场及实验室测定了煤层的瓦斯吸附常数、煤样孔隙率、视密度、水分、煤层的瓦斯含量、煤层的透气性系数和钻孔瓦斯涌出量衰减系数。综合黄白茨矿12#煤层1295综采工作面的实际情况，分析了综采工作面瓦斯来源主要是：本煤层瓦斯涌出，下邻近层瓦斯涌出和采空区瓦斯涌出。在分析瓦斯源的基础上，采用分源预测法，预测了各个瓦斯涌出源的瓦斯涌出量，通过计算得出：本煤层和采空区瓦斯涌出量占工作面瓦斯涌出量的86%，因此提出了本煤层和采空区相结合的瓦斯抽放方法。其次从安全、经济、煤层赋存条件、瓦斯涌出量等方面考虑，综合分析了常用瓦斯抽放方法的优缺点及其适用条件，确定了顺层钻孔抽放法和采空区插管法相结合的瓦斯抽放方法。在确定瓦斯抽放方法的基础上，，主要对瓦斯抽放方法中的钻孔间距、瓦斯抽放合理时间及钻孔的深度进行了理论分析。通过相对压力指标法确定了钻孔的合理间距；通过瓦斯涌出理论确定了钻孔的合理深度；通过钻孔瓦斯涌出量的衰减性随着时间而有规律的变化来确定钻孔的合理抽放时间。最后在理论分析的基础上，通过FLUENT数值模拟钻孔周围瓦斯压力随着不同时间的变化情况，验证了钻孔的间距和合理的抽放时间与理论计算的结果相一致。通过对瓦斯抽放参数的优化，明显提高了瓦斯抽放效率，瓦斯抽放的浓度也有所提高，回风巷中瓦斯浓度有了明显地降低，工作面断电次数减少，确保了工作面安全、高效地进行生产。这些效果也间接地产生了经济效益：抽放瓦斯浓度的提高，为瓦斯的利用提供了资源；工作面断电次数减少，确保了煤炭产量。通过对抽放钻孔间距、抽放钻孔时间及抽放钻孔的深度等参数的理论分析与数值模拟，为黄白茨矿的综合瓦斯抽放提供一个科学的、量化的参考依据。
[Abstract]:Since ventilation alone can not completely solve the problem of gas exceeding limit in No. 1295 fully mechanized mining face of Huangbai Coal Mine, the measures of gas drainage can be adopted to solve the problem of gas exceeding limit in this working face. The study of gas drainage is, in the final analysis, the study of gas drainage parameters. Based on this point, this paper studies the gas drainage parameters of 1295 fully mechanized coal face by combining theoretical analysis and numerical simulation. At first, the gas adsorption constant, apparent density, moisture content, gas permeability coefficient of coal seam and attenuation coefficient of gas emission from borehole were measured in the coal seam No. 12 of Huangbai Coal Mine. Based on the actual situation of No. 1295 fully mechanized mining face in No. 12 coal seam of Huangbai Coal Mine, the gas sources of fully mechanized coal face are analyzed as follows: gas emission from the coal seam, gas emission from the lower adjacent strata and gas emission from the goaf. Based on the analysis of the gas source, the gas emission quantity of each gas emission source is predicted by using the method of source separation prediction. It is concluded by calculation that the amount of gas emission in this coal seam and goaf accounts for 86% of the gas emission in the working face, so a gas drainage method combining the coal seam and the goaf is put forward. Secondly, from the aspects of safety, economy, coal seam occurrence condition, gas emission quantity and so on, the advantages and disadvantages of common gas drainage methods and their applicable conditions are analyzed synthetically. The gas drainage method combined with borehole drainage method and goaf intubation method was determined. On the basis of determining the method of gas drainage, the interval between boreholes, the reasonable time of gas drainage and the depth of borehole in the method of gas drainage are analyzed theoretically. The reasonable spacing of borehole is determined by relative pressure index method, the reasonable depth of borehole is determined by gas emission theory, and the reasonable drainage time is determined by the attenuation of gas emission from borehole with time. Finally, on the basis of theoretical analysis, the variation of the gas pressure around the borehole with different time is simulated by FLUENT numerical simulation, which verifies that the interval between the boreholes and the reasonable drainage time are consistent with the theoretical calculation results. By optimizing the parameters of gas drainage, the efficiency of gas drainage is obviously improved, the concentration of gas drainage is also increased, the gas concentration in the return air roadway is obviously reduced, the number of power cuts in the working face is reduced, and the safety of the working face is ensured. Produce efficiently. These effects have also indirectly produced economic benefits: the increase of gas drainage concentration provides resources for gas utilization and the reduction of the number of power cuts in the working face ensures the coal production. Through the theoretical analysis and numerical simulation of the parameters such as the interval between the drainage holes, the time of the drainage holes and the depth of the drainage holes, this paper provides a scientific and quantitative reference basis for the comprehensive gas drainage in Huangbacci Mine.
【学位授予单位】：内蒙古科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TD712.6

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