【摘要】：檸條塔煤礦屬近距離煤層群開采,經(jīng)過回采后的上部煤層的采空區(qū)存在大量積水,對下部煤層開采前,需要對上部煤層采空區(qū)進行探放水,在排放水過程中若漏風供氧量較大,易造成上部采空區(qū)水浸浮煤自燃,嚴重地威脅到礦井的安全生產(chǎn)。因此,研究檸條塔礦采空區(qū)水浸煤自燃早期預報技術對提高礦井的安全生產(chǎn)水平有非常重要的意義。本文以檸條塔2-2水浸煤為研究對象,通過煤程序升溫實驗和大型自然發(fā)火實驗,著重對煤自燃過程中的特征溫度、氣體濃度等特性參數(shù)進行了分析研究;利用灰色關聯(lián)分析的方法對最易造成煤樣自燃的含水率的煤樣進行了分析,確定了檸條塔礦煤自然發(fā)火早期預報指標,并建立了煤自然發(fā)火分級預警體系;根據(jù)本文研究獲得的水浸煤自燃極限參數(shù),結合礦井采空區(qū)煤自燃三帶范圍,確定了采空區(qū)溫度和氣體監(jiān)測測點的布置方案;利用光纖測溫系統(tǒng)和束管監(jiān)測系對采空區(qū)溫度和氣體進行實時監(jiān)測,結合預報指標對采空區(qū)自然發(fā)火狀況進行了早期預報。主要結論有:(1)通過程序升溫實驗,確定了不同含水率煤樣自燃過程中溫度和氣體等特性參數(shù)。不同含水率的煤樣升溫過程產(chǎn)生的CO、CO2等氣體濃度與煤溫總體呈指數(shù)規(guī)律變化;C2H4與C2H6氣體均在煤溫升到70℃左右才出現(xiàn),兩種氣體產(chǎn)生量隨煤溫也大致呈規(guī)指數(shù)規(guī)律變化;含水率13.67%的煤樣最易導致煤自然發(fā)火。(2)基于煤自燃指標氣體的選取原則,先對煤自燃過程中的氣體指標進行了定性分析,再利用灰色關聯(lián)分析法,通過定量分析確定了檸條塔水浸煤自燃早期預報的氣體指標。將低溫階段水浸煤自燃分為三個階段,指標氣體為CO和C2H4,并以指標氣體和與煤溫相對應的氣體濃度作為指標建立了煤自然發(fā)火分級預警體系。(3)依據(jù)煤自然發(fā)火實驗所得到的極限參數(shù)及礦井三帶劃分資料,確定了檸條塔礦N1116采空區(qū)煤自然發(fā)火動態(tài)監(jiān)測方案;利用分布式光纖測溫系統(tǒng)和束管監(jiān)測系統(tǒng)同時測得溫度數(shù)據(jù)和氣體數(shù)據(jù),并與本文確定的早期預報指標進行了對比,結果與實際相符,初步驗證了早期預報的準確性。
[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，

本文編號：2236685