朱仙庄煤矿Ⅱ863综放工作面采空区

hree zones of mined-out area should be measured with right and reasonable Sensor location and advanced technology equipment and means. With the change rule of temperature and gas composition measured and the rule of coal oxidation analyzed, the distribution of the three zones of mined-out area of Ⅱ863 working face is found. The essence of the nitrogen injection fire prevention is that when a certain flow of nitrogen is injected into the three zones of mined-out area and the oxygen content is lower than 3% to 10%, the fire in mined-out area is stamped out. With the distribution of the mined-out area of the fully mechanized roof-caving face analyzed, the nitrogen injection technological process of the fully mechanized roof-caving face is discussed and the scientific methods to prevent the coal spontaneous combustion are put forward.