| The both sides or around of the isolated island caving workface are goafs.the Neigbouring goafs connect with the goaf of the isolated island caving workface, after the mining, air leakage is complex, and the coal in the neigbouring goafs have been oxidized,The spontaneous combustion possibly occur in the goaf of the isolated island caving workface and the neibouring goafs.Interfere with the mining,Affect the safety of the mine production.This paper takes the Nantun mine as research object.first, anlyzed the characteristics of spontaneous combustion at the isolated island caving seam seam, on the base of the factors of spontanoue combustion at isolated island caving coal seam .Second, By making use of the self-ignition experiment oven, attaining the characteristic parameters of the mine spontaneous combustion which can provide basic data for the simulation of coal spontaneous combustion. Third, fited curves of the oxygen concentration and static pressure, attaining the raleted imfomation, by local observation. which provide the data for the boundaries of air difffusion-convection model.the air diffusion-convection equation can be set up,by using the knowledge of porous theory,hydrodynamics and thermodynamics.simulated by FLUENT software,attained the flow rule of air ,the distribution of oxygen concenteation and the distribution of static pressure in the goaf of isolated island caving and neigbouring goafs.Fnally,maked off the dangerous zone of coal spontaneous combustion.According to the characteristics of the spomtaneous combustion and the prediction of spontaneous combustion puted forward the concete measures of prevention for coal spontaneous combustion.gain a remarkable effecr in the practice.This paper researched on the dangerous zone of isolated island caving workface,and puted forward corresponding prevention measures,which has practical significance to guide the prevention for coal spontaneous combustion.
|
PDF Full Text Request