煤矿自燃火灾的烟气流动模拟及防治

发布时间：2018-03-25 02:15

本文选题：自燃火灾　切入点：烟气流动　出处：《中北大学》2014年硕士论文

【摘要】：煤矿火灾是煤矿五大灾害之一，它不仅烧毁大量的煤炭资源，还造成人员伤亡和经济损失，严重影响了煤矿的安全生产。煤矿发生火灾后会产生有毒有害气体和大量热量，并形成火风压。风流在火灾动力的作用下，容易发生状态紊乱，从而造成巨大的损失。自燃火灾占所有煤矿火灾的70%以上。因此，研究煤矿自燃火灾，对于煤矿的安全生产以及社会的稳定有着重要的意义。另外，根据煤矿工作面的实际情况，研究自燃火灾的综合防治技术，对制订合适的防灭火方案，快速高效的火灾防治也有着重大意义。研究煤矿自燃火灾烟气流动是认识矿井自燃火灾规律、建立预测理论、开发防治技术的基础。本文通过分析自燃火灾烟气发生、发展过程的规律，建立了自燃火灾时期烟气流动的的数学模型和物理模型。本文利用CFX软件设置边界条件和初始参数，模拟火灾烟气流动，分析通风条件对烟气流动的影响，得出以下结论：煤矿发生自燃火灾后，在没有通风的情况下，燃烧产生的烟气会对称流动，从中间往两侧同时流动；在有通风的条件下，随着风速的增加，烟气向风流入口处流动的速度减慢，直至不流动。本文还以某煤矿的综放工作面为对象研究了自燃火灾的综合防治技术。结合工作面的实际情况，，根据煤样升温氧化实验结果，决定加强工作面自燃发火预测预报，采用注氮和灌浆为主，阻化剂防火和氮气泡沫灭火等技术相结合的自燃综合防治技术，以防治综放工作面自燃发火，也为极软、高瓦斯突出、易自燃特厚煤层的自燃火灾防治提供了一定的经验。
[Abstract]:Coal mine fire is one of the five major disasters in coal mine. It not only burns a large number of coal resources, but also causes casualties and economic losses, which seriously affects the safety of coal mine production. Under the action of fire power, wind flow is prone to state disorder, resulting in huge loss. Spontaneous combustion fire accounts for more than 70% of all coal mine fires. Therefore, the study of coal mine spontaneous combustion fire, In addition, according to the actual situation of coal mining face, the comprehensive prevention and control technology of spontaneous combustion fire is studied, and the appropriate fire prevention and extinguishing scheme is made, which is of great significance to the safety production of coal mine and the stability of society. Rapid and efficient fire prevention is also of great significance. The study of spontaneous combustion smoke flow in coal mine is the basis of understanding the law of mine spontaneous combustion fire, establishing prediction theory and developing prevention and control technology. This paper analyzes the law of the occurrence and development process of spontaneous combustion fire smoke. The mathematical and physical models of flue gas flow during spontaneous combustion fire are established. In this paper, the boundary conditions and initial parameters are set up by using CFX software to simulate the smoke flow, and the influence of ventilation conditions on flue gas flow is analyzed. The following conclusions are drawn: after the spontaneous combustion fire occurs in a coal mine, the smoke generated by combustion will flow symmetrically from the middle to the two sides without ventilation, and under the condition of ventilation, with the increase of the wind speed, The flow of smoke to the inlet of the wind flow slowed until it did not flow. This paper also studies the comprehensive prevention and control technology of spontaneous combustion fire in a fully mechanized caving face of a coal mine. According to the actual situation of the working face and the experimental results of coal sample heating and oxidation, it is decided to strengthen the prediction and prediction of spontaneous combustion combustion in the working face. The integrated prevention and control technology of spontaneous combustion is adopted, which is composed of nitrogen injection and grouting, fire prevention of chemical inhibitor and fire extinguishing by nitrogen foam, so as to prevent spontaneous combustion in fully mechanized caving face, which is also very soft and high gas outburst. The self-ignition fire prevention and control of easy self-ignition thick coal seam provides certain experience.
【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TD753

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