【摘要】：近年來我國礦井開采深度不斷增大,一些礦井采掘過程中出現(xiàn)了瓦斯異常涌出現(xiàn)象,造成工作面瓦斯超限及局部瓦斯聚積,降低工作面推進速度,增大采空區(qū)遺煤自燃危險性。本文以鮑店礦七采區(qū)73上09工作面為研究對象,采用實驗研究、數(shù)值模擬和現(xiàn)場實測等方法對瓦斯異常區(qū)采空區(qū)煤自燃特點及防控措施進行了分析與研究。由于現(xiàn)有程序升溫實驗裝置溫度不易控制,煤樣受熱不均且氣密性較差,不符合瓦斯對煤自燃特性影響的實驗要求,故搭建了一體式煤自燃性測試實驗裝置,采用一體式設(shè)計,操作簡便,裝煤量250g,用油量4.9L,供風(fēng)量為7.4~39.9ml/min,實驗裝置在煤樣升溫速率穩(wěn)定性、煤樣溫度均勻性以及實驗裝置氣密性上滿足實驗要求。根據(jù)實驗結(jié)果,煤樣臨界溫度75℃~90℃,干裂溫度110℃~120℃,優(yōu)選CO氣體和C_2H_4氣體作為主要的煤自燃預(yù)報性指標(biāo)氣體,選擇混樣作為瓦斯對煤自燃特性影響實驗的粒度。根據(jù)實驗結(jié)果,瓦斯對煤自燃進程起到了抑制作用,在利用CO氣體和C_2H_4氣體作為煤自燃預(yù)報性指標(biāo)氣體時應(yīng)將氣體指標(biāo)濃度適當(dāng)降低。同時根據(jù)實驗結(jié)果得到煤自燃極限參數(shù),為采空區(qū)自燃“三帶”劃分提供理論依據(jù)。通過數(shù)值模擬研究掌握了73上09工作面在風(fēng)速和實施隅角瓦斯治理作用下采空區(qū)漏風(fēng)和氧濃度場分布規(guī)律,當(dāng)增大工作面風(fēng)速或?qū)嵤┯缃峭咚怪卫泶胧┖?采空區(qū)氧化升溫帶向采空區(qū)深部移動,且其寬度加大,增加了采空區(qū)遺煤自燃危險性。對鮑店礦73上09工作面進行現(xiàn)場實測,劃分出采空區(qū)自燃“三帶”,確定采空區(qū)煤自燃重點防控區(qū)域,得出進風(fēng)側(cè)氧化升溫帶50~120m,回風(fēng)側(cè)氧化升溫帶20~40m,工作面最小推進速率為2.69m/d。根據(jù)實驗結(jié)果、數(shù)值模擬以及現(xiàn)場實測,制定出對應(yīng)的防控措施,主要包括:對本面采空區(qū)及沿空側(cè)采空區(qū)采取粉煤灰灌漿防滅火措施,利用無機固化膨脹充填措施進行堵漏風(fēng),將膠體阻化防滅火技術(shù)作為應(yīng)急處理措施。根據(jù)監(jiān)測數(shù)據(jù),回采期間及停采、回撤、封閉時期,CO濃度控制在24ppm以內(nèi),采空區(qū)沒有發(fā)生遺煤自燃現(xiàn)象,實現(xiàn)了73上09工作面安全高效生產(chǎn)。
[Abstract]:In recent years, the depth of mine mining in our country has been increasing, some abnormal gas emission phenomenon appears in the mining process of some mines, which results in the gas exceeding limit and local gas accumulation in the working face, reduces the speed of working face advance, and increases the danger of spontaneous combustion of the coal left over the goaf. In this paper, the characteristics of coal spontaneous combustion and control measures in goaf in abnormal gas area are analyzed and studied by means of experimental study, numerical simulation and field measurement, taking 73 Shang09 face of No. 7 mining area of Baodian Mine as the research object. Because the temperature of the existing programmed temperature test equipment is not easy to control, the coal sample is unevenly heated and the gas tightness is poor, which does not meet the experimental requirements of the influence of gas on the spontaneous combustion characteristics of coal, so an integrated coal spontaneous combustion test device is built, and the integrated design is adopted. The operation is simple, the coal loading capacity is 250g, the oil quantity is 4.9 L, and the air supply rate is 7.4 ~ 39.9ml / min. The experimental device meets the experimental requirements in terms of the stability of the coal sample heating rate, the uniformity of the coal sample temperature and the gas tightness of the experimental device. According to the experimental results, the critical temperature of coal sample is 75 鈩，

本文編號：2171269