高瓦斯矿井封闭火区瓦斯爆炸实验及数值模拟研究

发布时间：2018-05-22 12:25

本文选题：元可燃性气体 + 爆炸特性　；参考：《西安科技大学》2013年硕士论文

【摘要】：瓦斯爆炸是危害最大的矿井灾害之一。高瓦斯矿井火区封闭过程中存在着很大的爆炸危险，研究矿井多元瓦斯气体爆炸特性以及封闭区域内的爆炸过程对防治瓦斯爆炸具有重要的现实意义。本实验利用20L近球形爆炸实验装置，分别测试了CH_4、CO、C_2H_6和H_2的爆炸极限，与文献值进行对比，引入爆炸危险度的概念分析每种气体的爆炸危险性；在此基础上依据实际矿井气体成分检测结果，选取三组具有代表性的CO、C_2H_6、H_2浓度配比，测得每种配比条件下CH_4的爆炸极限及CH_4浓度6-12%时的爆炸特性参数，研究其他可燃性气体对于CH_4爆炸特性的影响；选取纯CH_4和一组多元可燃性气体配比条件分别测试其临界氧浓度，为井下现场的防爆工作提供一定的理论基础。利用专业气体爆炸模拟软件FLACS，对与实验相同条件下的密闭空间多元可燃性气体爆炸过程进行数值模拟，将模拟结果与实验结果进行对比，分析误差，验证FLACS模拟多元可燃性气体爆炸的可行性；通过分析不同时刻容器内压力场、爆炸产物浓度场、可燃性气体浓度场及速率场的变化，揭示了爆炸波的传播形态及小空间内爆炸过程的压力分布。依托于实际矿井，建立了接近真实的U型通风工作面模型，利用FLACS软件对巷道内气体爆炸过程进行了数值模拟，，并系统地研究了点火位置、可燃性气体填充长度、气体成分浓度、巷道内障碍物及不同密闭情况对爆炸过程的影响。本文研究所得可为高瓦斯矿井封闭火区内的瓦斯爆炸控制提供一定借鉴。
[Abstract]:Gas explosion is one of the most harmful mine disasters. There is a great danger of explosion in the process of closing the fire area of high gas mine. It is of great practical significance to study the explosion characteristics of multiple gas in the mine and the explosion process in the closed area to prevent and cure the gas explosion. In this experiment, the explosion limit of CH4COG / C _ 2H _ 2H _ (6) and H _ s _ 2 was tested by using a 20L near-spherical explosive experimental device. The explosion hazard of each gas was analyzed by introducing the concept of explosion risk. On this basis, according to the actual mine gas composition detection results, three groups of representative COSC2H2H / SHP _ 2 concentration ratio are selected, and the explosion limit of CH_4 and the explosion characteristic parameters of 6-12% CH_4 concentration under each ratio are measured. The effects of other combustible gases on the explosion characteristics of CH_4 are studied, and the critical oxygen concentration of pure CH_4 and a group of multicomponent combustible gases are measured respectively, which provides a theoretical basis for the explosion prevention work in the underground field. The numerical simulation of multivariate combustible gas explosion in airtight space under the same experimental conditions was carried out by using the professional gas explosion simulation software FLACS. The simulation results were compared with the experimental results and the error was analyzed. The feasibility of simulating multicomponent combustible gas explosion by FLACS is verified, and the variation of pressure field, concentration field of explosion product, concentration field and rate field of combustible gas in vessel at different times are analyzed. The propagation pattern of explosion wave and the pressure distribution of explosion process in small space are revealed. Based on the actual mine, the model of U-type ventilation working face is established, and the numerical simulation of gas explosion process in roadway is carried out by using FLACS software, and the ignition position and the filling length of combustible gas are systematically studied. The effects of gas concentration, obstacles in roadway and different airtight conditions on the explosion process. The research in this paper can be used for reference for the control of gas explosion in the closed fire zone of high gas mine.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TD712.7

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