高瓦斯易自燃煤层采空区燃爆耦合灾害研究

发布时间：2018-03-03 16:32

本文选题：遗煤自燃　切入点：数值模拟　出处：《西安科技大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着煤层赋存深度及开采强度的不断加大,遗煤自燃引发瓦斯爆炸的燃爆耦合灾害日渐凸显。本文以崔家沟煤矿2207综采工作面采空区为研究对象,通过现场实测、数值模拟及理论分析的方法,研究高瓦斯易自燃煤层采空区燃爆耦合危险区域及灾害危险性,为矿井的灾害防治提供依据。在采空区现场布置测点,束管监测采空区两道遗煤内的氧气及瓦斯浓度变化,结合相应的漏风强度划分采空区三带,得出正常推进情况下,氧化升温带在采空区两道处较宽,在采空区中部由进风侧的36m宽缩至回风侧的25m宽,且采空区无自然发火危险。利用FLUENT软件模拟采空区流场分布,双指标划分采空区三带并与现场实测的三带结果进行比对,得出数值模拟具有一定的可靠性,其氧化升温带及瓦斯浓度场的分布可用于指导现场的灾害防治工作;分析了供风量对采空区三带分布的影响,得出随着供风量的增大,氧化升温带逐渐远离工作面,但其分布范围不断扩大。从煤自燃和瓦斯爆炸的发生条件入手,对采空区燃爆耦合灾害的致灾机理进行了进一步探讨,并在判定耦合危险区域的基础上,提出引入温度场对耦合区域的危险性进行分析;应用数值模拟的氧化升温带及瓦斯浓度分布结果,划分不同供风量下的采空区燃爆耦合危险区域,得出耦合危险区域分布的宽度和广度随供风量的增加而增大;以崔家沟矿2207工作面的燃爆耦合危险区域为基础,引入现场和实验温度变化数据,分析得到大约在工作面停采后第14天时,极可能发生采空区燃爆耦合灾害,应及时采取防控措施。本文以现场实测为基础,综合应用数值模拟、理论分析,判定采空区燃爆耦合危险区域及其危险性的方法与研究得出的结果,能够为高瓦斯易自燃煤层采空区燃爆耦合灾害提供治理依据。
[Abstract]:With the increasing of coal seam occurrence depth and mining intensity, the coupling disaster of gas explosion caused by coal spontaneous combustion is becoming more and more prominent. This paper takes the goaf of Cuijiagou coal mine 2207 fully mechanized mining face as the research object, through the field measurement, By numerical simulation and theoretical analysis, the coupling hazard area and disaster risk of goaf in goaf of high gas spontaneous combustion coal seam are studied in order to provide basis for disaster prevention and control of mine. By monitoring the change of oxygen and gas concentration in two coals in the goaf, combining with the corresponding air leakage intensity, the paper divides the three zones of goaf into three zones, and concludes that under normal propulsion, the oxidation heating zone is wider in the two channels of the goaf. In the middle of the goaf, the width of the goaf is reduced from 36 m wide to 25 m width of the return wind side, and there is no spontaneous combustion hazard in the goaf. The distribution of the flow field in the goaf is simulated by FLUENT software, and the three zones of goaf are divided by two indexes and compared with the measured results of the three zones in the field. It is concluded that the numerical simulation has certain reliability, and the distribution of oxidation heating zone and gas concentration field can be used to guide the disaster prevention and control work on the spot, and the influence of air supply on the distribution of three zones in goaf is analyzed, and the results show that the distribution of air supply increases with the increase of air supply. The oxidation heating zone is gradually far away from the working face, but its distribution range is expanding continuously. From the conditions of spontaneous combustion of coal and gas explosion, the mechanism of coupling disaster caused by combustion and explosion in goaf is further discussed. On the basis of determining the coupling dangerous area, the paper puts forward that the temperature field is introduced to analyze the hazard of the coupling region, and the results of oxidation heating zone and gas concentration distribution are applied to the numerical simulation. The distribution width and width of the coupling hazard area are obtained by dividing the coupling dangerous area of goaf under different air supply rate with the increase of air supply, and based on the coupling dangerous area of Cuijiagou coal mine 2207 working face. By introducing the field and experimental temperature variation data, it is obtained that the coupling disaster of combustion and explosion in goaf is likely to occur on the 14th day after the mining stoppage at the working face, and the preventive and control measures should be taken in time. In this paper, based on the field measurement, the numerical simulation is applied synthetically. The theoretical analysis, the method and the research result of judging the dangerous area and the danger of the coupling of explosion and combustion in the goaf can provide the control basis for the coupling disaster of the combustion and explosion in the goaf of the coal seam with high gas easily spontaneous combustion.
【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】：TD752.2

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