Study On Technology Of Fire Prevention And Extinguishing For Close Distance Coal In Da Foshi Coal

In this paper, a large coal spontaneous combustion experiment and a programmed temperature rise experiment were carried out for 40107 working face and 40104 working face of overburden gob in Dafosi coal mine. The spontaneous combustion characteristics of Dafosi coal were tested, and the results were as follows: The critical temperature of 40107 coal face is 31 days. The critical temperature of this layer is 50 ?60 ? and the dry temperature is about 90 ? 100 ?. The prediction of spontaneous combustion of coal is given And the limit parameters of coal spontaneous combustion were determined. The distribution law of spontaneous combustion "three zones" in the gob of the working face was obtained by experiments.This paper systematically analyzes the spontaneous combustion rules of coal mining in the large Buddhist temple, and makes good use of the technology such as corner plugging air technology, nitrogen injection fire prevention technology, injection fire prevention and fire suppression technology and resistance agent. The calculation method of the amount of fly ash and the calculation method of nitrogen flow rate are given. The location and spacing of the injection hole are determined, and the injection technology and the construction technology of the inhibitor are given. To achieve the purpose of preventing the spontaneous combustion of coal in the goaf, to ensure the safe recovery of the face, and achieved good economic benefits.