柠条塔矿采空区水浸煤自燃特性参数及早期预报技术研究
发布时间：2018-09-11 12:27
【摘要】：柠条塔煤矿属近距离煤层群开采,经过回采后的上部煤层的采空区存在大量积水,对下部煤层开采前,需要对上部煤层采空区进行探放水,在排放水过程中若漏风供氧量较大,易造成上部采空区水浸浮煤自燃,严重地威胁到矿井的安全生产。因此,研究柠条塔矿采空区水浸煤自燃早期预报技术对提高矿井的安全生产水平有非常重要的意义。本文以柠条塔2-2水浸煤为研究对象,通过煤程序升温实验和大型自然发火实验,着重对煤自燃过程中的特征温度、气体浓度等特性参数进行了分析研究;利用灰色关联分析的方法对最易造成煤样自燃的含水率的煤样进行了分析,确定了柠条塔矿煤自然发火早期预报指标,并建立了煤自然发火分级预警体系;根据本文研究获得的水浸煤自燃极限参数,结合矿井采空区煤自燃三带范围,确定了采空区温度和气体监测测点的布置方案;利用光纤测温系统和束管监测系对采空区温度和气体进行实时监测,结合预报指标对采空区自然发火状况进行了早期预报。主要结论有:(1)通过程序升温实验,确定了不同含水率煤样自燃过程中温度和气体等特性参数。不同含水率的煤样升温过程产生的CO、CO2等气体浓度与煤温总体呈指数规律变化;C2H4与C2H6气体均在煤温升到70℃左右才出现,两种气体产生量随煤温也大致呈规指数规律变化;含水率13.67%的煤样最易导致煤自然发火。(2)基于煤自燃指标气体的选取原则,先对煤自燃过程中的气体指标进行了定性分析,再利用灰色关联分析法,通过定量分析确定了柠条塔水浸煤自燃早期预报的气体指标。将低温阶段水浸煤自燃分为三个阶段,指标气体为CO和C2H4,并以指标气体和与煤温相对应的气体浓度作为指标建立了煤自然发火分级预警体系。(3)依据煤自然发火实验所得到的极限参数及矿井三带划分资料,确定了柠条塔矿N1116采空区煤自然发火动态监测方案;利用分布式光纤测温系统和束管监测系统同时测得温度数据和气体数据,并与本文确定的早期预报指标进行了对比,结果与实际相符,初步验证了早期预报的准确性。
[Abstract]:Caragana tower coal mine belongs to the close distance coal seam group mining. After mining, there is a lot of water in the goaf of the upper coal seam after mining. Before mining the lower coal seam, it is necessary to explore and discharge water in the upper coal seam goaf, and if the air leakage supply oxygen quantity is large in the process of discharging water, It is easy to cause spontaneous combustion of floating coal in the upper goaf, which seriously threatens the safety of mine production. Therefore, it is very important to study the early prediction technology of coal spontaneous combustion in the goaf of Caragana Tower Mine. In this paper, taking Caragana Caragana Tower-2-2 as the research object, the characteristic temperature, gas concentration and other characteristic parameters in the process of spontaneous combustion of coal are analyzed and studied through the experiments of coal programmed heating and large-scale spontaneous combustion. The method of grey correlation analysis is used to analyze the coal samples which are most likely to cause spontaneous combustion of coal samples, and the early prediction index of coal spontaneous combustion in Caragana Tower Mine is determined, and the classification and early warning system of coal spontaneous combustion is established. According to the limit parameters of coal spontaneous combustion obtained in this paper, combined with the range of three zones of coal spontaneous combustion in goaf, the layout scheme of goaf temperature and gas monitoring measuring points is determined. The temperature and gas in goaf are monitored in real time by using optical fiber temperature measurement system and beam tube monitoring system, and the spontaneous combustion condition in goaf is forecasted in the combination of prediction index. The main conclusions are as follows: (1) the temperature and gas characteristics of coal samples with different moisture content are determined by programmed temperature test. The concentration of CO,CO2 and coal temperature of coal samples with different moisture content increased exponentially. The gas of C _ 2H _ 4 and C2H6 did not appear until the coal temperature increased to 70 鈩，
本文编号：2236685
[Abstract]:Caragana tower coal mine belongs to the close distance coal seam group mining. After mining, there is a lot of water in the goaf of the upper coal seam after mining. Before mining the lower coal seam, it is necessary to explore and discharge water in the upper coal seam goaf, and if the air leakage supply oxygen quantity is large in the process of discharging water, It is easy to cause spontaneous combustion of floating coal in the upper goaf, which seriously threatens the safety of mine production. Therefore, it is very important to study the early prediction technology of coal spontaneous combustion in the goaf of Caragana Tower Mine. In this paper, taking Caragana Caragana Tower-2-2 as the research object, the characteristic temperature, gas concentration and other characteristic parameters in the process of spontaneous combustion of coal are analyzed and studied through the experiments of coal programmed heating and large-scale spontaneous combustion. The method of grey correlation analysis is used to analyze the coal samples which are most likely to cause spontaneous combustion of coal samples, and the early prediction index of coal spontaneous combustion in Caragana Tower Mine is determined, and the classification and early warning system of coal spontaneous combustion is established. According to the limit parameters of coal spontaneous combustion obtained in this paper, combined with the range of three zones of coal spontaneous combustion in goaf, the layout scheme of goaf temperature and gas monitoring measuring points is determined. The temperature and gas in goaf are monitored in real time by using optical fiber temperature measurement system and beam tube monitoring system, and the spontaneous combustion condition in goaf is forecasted in the combination of prediction index. The main conclusions are as follows: (1) the temperature and gas characteristics of coal samples with different moisture content are determined by programmed temperature test. The concentration of CO,CO2 and coal temperature of coal samples with different moisture content increased exponentially. The gas of C _ 2H _ 4 and C2H6 did not appear until the coal temperature increased to 70 鈩，
本文编号：2236685
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