矿井火灾诱发爆炸动态演化规律及防治技术研究

发布时间：2018-04-13 22:23

本文选题：矿井火灾 + 瓦斯爆炸　；参考：《中国矿业大学（北京）》2013年博士论文

【摘要】：研究煤矿火灾诱发爆炸及其防治对提高煤矿防灾、抗灾能力和应急救灾决策的技术水平具有重要意义。本文运用有关理论对煤矿火灾诱发爆炸的规律、预警、可靠性辨识及火区安全防治等方面进行了较为系统的研究。建立了煤矿火区封闭过程中诱发瓦斯爆炸的数学模型，并进行了实例验证。分析出正压通风引起火源逆向蔓延及不利于自燃的早期发现。封闭导致风量降低很大时，自燃点上风侧的高浓度积聚瓦斯流向火源位置具有爆炸危险性。瓦斯爆炸发生后，极短时间内会在爆源区首先产生负压进而产生冲击波正压区。分析出火灾标志气体选择标准和CO作为火灾标志性气体所必需的校正技术。分析了矿井火灾事故和瓦斯爆炸的预警技术，构建了瓦斯爆炸多层次综合分析预警指标体系，建立了瓦斯爆炸危险综合指标评价模型，对预警指标进行了量化，对瓦斯爆炸危险与预警状态进行了分级，并进行了模型检验。提出了火区封闭效果评价的方法、火区气体信息采集的十六项准则和火区燃烧状态的判断技术准则。根据注惰射流与可燃气体层相对位置和影响，以重力流和射流理论为基础，，推导了防止密闭火区发生爆炸等危险的注惰临界速度并进行了实验验证。
[Abstract]:It is of great significance to study the explosion induced by coal mine fire and its prevention and control to improve the ability of coal mine disaster prevention, disaster resistance and emergency decision.In this paper, the rules of coal mine fire induced explosion, early warning, reliability identification and fire area safety prevention and control are systematically studied by using relevant theories.The mathematical model of gas explosion induced in the process of coal mine fire area closure is established, and an example is given to verify the model.The early detection of adverse spread of fire source caused by positive pressure ventilation and unfavorable to spontaneous combustion was analyzed.When the air volume is reduced greatly, the high concentration of gas accumulated on the wind side of the spontaneous combustion point has the risk of explosion at the location of the fire source.After the gas explosion occurs, the negative pressure will first occur in the source area of the explosion and then the positive pressure zone of the shock wave will be generated in a very short time.The selection standard of fire mark gas and the necessary correction technology of CO as the signature gas of fire are analyzed.This paper analyzes the early-warning technology of mine fire accident and gas explosion, constructs the multi-level comprehensive analysis and early warning index system of gas explosion, establishes the comprehensive index evaluation model of gas explosion hazard, and quantifies the early warning index.The danger and warning state of gas explosion were classified and the model was tested.The evaluation method of fire zone sealing effect, the 16 criteria for collecting gas information and the technical criterion for judging the combustion state of fire zone are put forward.According to the relative position and influence of inert jet and flammable gas layer, based on the theory of gravity flow and jet, the critical velocity of inert injection is deduced and verified by experiments.
【学位授予单位】：中国矿业大学（北京）
【学位级别】：博士
【学位授予年份】：2013
【分类号】：TD752

【参考文献】