Study On Fire Prevention And Extinguishing Technology In Fully Mechanized Caving Face Of Inflammable Extra-thick Coal Seam

The application of fully mechanized top coal caving mining method has brought a severe test to the working face with high efficiency and high efficiency of the working face.Especially in the extra-thick spontaneous combustion coal mining, the mined-out area is often left with a large amount of loose coal, and the degree of caving is serious and the air leakage is serious, which makes it easy to oxidize the oxygen in the air leakage The spontaneous combustion of the air area seriously threatens the life safety of the miners and the safe production of the coal mines.Based on the change of CO concentration in N105 face, the spontaneous combustion process and fire area N105 working face are analyzed in this paper. The measures of reducing the temperature of the macromolecule colloid and the liquid carbon dioxide fire extinguishing technology were carried out. The measures of nitrogen reduction and liquid carbon dioxide as the main measures were put forward, and the plugging measures based on the colloid isolation were adopted, and the measures were adopted Lane to the goaf to carry out fire prevention work as a whole.The results show that the effect of N2 on the formation of alkane in low temperature stage is obvious. The effect of CO2 on the formation of alkane in the low temperature stage is obvious. The results show that the effect of N2 on the formation of alkane in the low temperature stage is obvious. The oxygen inoculation rate and CO production in the high temperature stage are more obvious. In general, the effect of high molecular colloid on the inhibition of CO, oxygen consumption rate and alkane production is more obvious.On the N105 face spontaneous fire scene "three belt" observation, found that the face of the rear 15 meters within the non-spontaneous combustion zone, 15 to 60 meters for the oxidation of spontaneous combustion, 60 meters above the choking zone. Combined with the nearby coal mine spontaneous combustion data and coal mining technology summary to determine the inlet and return side of the vicinity of 20m, fractured coal pillars, abandoned drilling, "two" and two lines "five for the spontaneous combustion of dangerous areas and fire The focus of the work.The combination of nitrogen injection and the spacing of nitrogen injection and the fire control scheme of N105 surface were determined by the combination of temperature programmed experiment and the spontaneous combustion of the "three zones". Through the treatment of the working area, the liquid carbon dioxide and Polymer colloid material cooling performance, and verify the polymer colloid material blocking and plugging effect, the actual project proved that for a wide range of high temperature fire zone, polymer colloid and liquid carbon dioxide technology has a good cooling effect, for the same Large range of high temperature fire area provides valuable experience.