安全技术与工程专业高瓦斯煤层抽放条件下综放采空区自燃预测研究大学毕设论文.doc

论文题目:高***煤层抽放条件下综放采空区自燃预测研究专业:安全技术及工程硕士生:陈明河(签名) 指导教师: 徐精彩张辛亥(签名) 摘要我们国家煤炭资源十分丰富,煤炭产量和消费量均居世界首位,但我国煤炭自燃火灾十分严重,严重制约了矿井的安全生产与发展,造成巨大的资源浪费、环境污染、人员和财产的损失。高***厚煤层综放开采情况下,煤层自燃更加严重,危害也更大。受抽放影响,采空区漏风更加复杂,自燃预测和防治困难。首先,利用大型煤自然发火实验台对煤的自燃特性进行了实验研究,测定了煤自燃在不同温度下的耗氧速度, CO 和 CO 2 的产生率,氧化放热强度以及自燃极限参数等, 为自燃预测预报奠定了基础;其次,对高***煤层综放工作面进行了现场观测,得到了抽放条件下采空区上、下巷的氧气、甲烷浓度及压力分布规律,分析得到采空区渗透系数随深度变化方程,通过现场实验得到采空区冒落带的高度分布规律,据此建立了高***煤层抽放条件下采空区渗流场和浓度场的三维模型;然后,利用流体计算软件 FLUENT 对高***自燃煤层抽放条件下的综放采空区进行网格划分并对采空区渗流场和浓度场模型进行求解,得到高***煤层抽放条件下综放采空区漏风状况及各组分气体浓度分布,数值模拟结果与现场实际基本吻合;最后,根据模拟结果,结合采空区三带划分理论,对高***煤层抽放条件下采空区自燃危险区进行判定,对自燃危险期进行预测,并计算出防止采空区自燃的工作面最小推进度。研究结果对高***煤层抽放条件下综放采空区自燃防治具有重要意义。关键词: 高***煤层;抽放;采空区;自然发火;预测;模拟论文类型: 应用研究 Subject : Research on Prediction of Self-ignition in Goaf of Fully Mechanized Top-Coal Face in High-Gas Coal Seams under the Condition of Gas Extraction Specialty : Safety Engineering Name : Chen Minghe (Signature) Instructor: Xu Jingcai Zhang Xinhai (Signature) ABSTRACT Coal resource is very abundant and output and consumption of coal in China ranked No one out of all countries in the world. Nevertheless, Coal self-ignition fire is very serious, which threatened safety production and caused enormous resource waste, environment pollution, loses of personnel. Self-ignition es more serious and harmful in high-gas and thick coal seams, especially in fully mechanized top-coal face, where air leakage is plex and makes prediction and prevention of self-fire in the goaf more difficult. Firstly, the large experiment device of coal self-ignition is used to study the character, evaluate oxygen consuming rate, calculate CO and CO 2 generating rate and heat releasing intensity of coal self-ignition. Critic parameters for bustistion of oxgen concentration, loose coal thickness and air leakage intensity can also be studied through the experiment ; Secondly, on-the-spot observation in the goaf of fully mechanized top-coal face in high-gas coal seam during the course of gas extraction are carried out, distributio