基于通风量与推进度的采空区自然发火数值模拟
Numerical Simulation of Spontaneous Combustion in Goaf Based on Ventilation and Advancing Degree
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摘要: 为了优化注氮防灭火技术的治理效果,以大同煤矿集团马道头煤业有限责任公司8401工作面为研究对象,采用数值模拟的方法,研究在没有注氮条件下和有注氮条件2种情况下工作面的通风量与推进度对采空区自燃氧化带范围的影响。研究表明:无论是注氮还是不注氮,工作面风量越大,氧化升温带越宽,采空区自然危险性越大;从预防工作面采空区自然发火角度考虑,尽量减小工作面的风量,即采用合理风量通风技术;8401综放工作面供风量的合理的范围为1 400~1 755 m3/min;同时得出8401综放工作面必须采取注氮措施,且保证工作面月推进度不小于36 m,该条件下注氮防灭火技术的应用效果最佳。Abstract: To optimize the control effect of nitrogen injection fire-fighting technology, the No.8401 working face in Madaotou Coal Industry Company of Datong Coal Mine Group is taken as the research object. The numerical simulation method is used to study the influence of ventilation and advancing degree of working face on the scope of spontaneous combustion oxidation zone in goaf under nitrogen injection and non-nitrogen injection. The results show that whether nitrogen injection or not, the larger the air volume in the working face is, the wider the oxidation temperature rise zone is, and the greater the spontaneous combustion risk of goaf is. From the view point of preventing the goaf from spontaneous combustion, the air volume of the working face should be reduced as much as possible, i.e. the reasonable ventilation technology should be adopted. The reasonable range of air supply in No.8401 fully mechanized caving face is 1 400~1 755 m3/min. At the same time, it is concluded that the nitrogen injection measures must be taken in No.8401 fully mechanized caving face, and the monthly advancing degree of the working face should be no less than 36 m. Under the above conditions, the application effect of nitrogen injection fire-fighting technology is the best.
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