本文選題：瓦斯抽放 + 數值分析　； 參考：《內蒙古科技大學》2013年碩士論文

【摘要】：由于單純依靠通風并不能徹底解決黃白茨礦1295綜采工作面瓦斯超限的問題，所以可以采用瓦斯抽放的措施來解決該工作面瓦斯超限的問題。對瓦斯抽放的研究，歸根到底就是對瓦斯抽放參數的研究。 本論文正是基于這一點，采用理論分析計算與數值模擬相結合的方法，對1295綜采工作面瓦斯抽放參數進行了研究。首先在黃白茨礦12#煤層現(xiàn)場及實驗室測定了煤層的瓦斯吸附常數、煤樣孔隙率、視密度、水分、煤層的瓦斯含量、煤層的透氣性系數和鉆孔瓦斯涌出量衰減系數。綜合黃白茨礦12#煤層1295綜采工作面的實際情況，分析了綜采工作面瓦斯來源主要是：本煤層瓦斯涌出，下鄰近層瓦斯涌出和采空區(qū)瓦斯涌出。在分析瓦斯源的基礎上，采用分源預測法，預測了各個瓦斯涌出源的瓦斯涌出量，通過計算得出：本煤層和采空區(qū)瓦斯涌出量占工作面瓦斯涌出量的86%，因此提出了本煤層和采空區(qū)相結合的瓦斯抽放方法。其次從安全、經濟、煤層賦存條件、瓦斯涌出量等方面考慮，綜合分析了常用瓦斯抽放方法的優(yōu)缺點及其適用條件，確定了順層鉆孔抽放法和采空區(qū)插管法相結合的瓦斯抽放方法。在確定瓦斯抽放方法的基礎上，，主要對瓦斯抽放方法中的鉆孔間距、瓦斯抽放合理時間及鉆孔的深度進行了理論分析。通過相對壓力指標法確定了鉆孔的合理間距；通過瓦斯涌出理論確定了鉆孔的合理深度；通過鉆孔瓦斯涌出量的衰減性隨著時間而有規(guī)律的變化來確定鉆孔的合理抽放時間。最后在理論分析的基礎上，通過FLUENT數值模擬鉆孔周圍瓦斯壓力隨著不同時間的變化情況，驗證了鉆孔的間距和合理的抽放時間與理論計算的結果相一致。 通過對瓦斯抽放參數的優(yōu)化，明顯提高了瓦斯抽放效率，瓦斯抽放的濃度也有所提高，回風巷中瓦斯?jié)舛扔辛嗣黠@地降低，工作面斷電次數減少，確保了工作面安全、高效地進行生產。這些效果也間接地產生了經濟效益：抽放瓦斯?jié)舛鹊奶岣�，為瓦斯的利用提供了資源；工作面斷電次數減少，確保了煤炭產量。通過對抽放鉆孔間距、抽放鉆孔時間及抽放鉆孔的深度等參數的理論分析與數值模擬，為黃白茨礦的綜合瓦斯抽放提供一個科學的、量化的參考依據。
[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.
【學位授予單位】：內蒙古科技大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TD712.6

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