煤矿坑口电厂烟道气用于采空区防灭火技术研究

Research on technology of applying the flue gas of pithead power plant to fire prevention and extinguishing in goaf

基于清洁生产的理念，以曹村矿11-214综放工作面为例，对坑口电厂烟道气用于煤矿采空区防灭火的可行性进行了数值计算。计算模型中引入了非均质孔隙率、在烟道气的处理中引入了多组分气体输运方程，计算结果显示：烟道气注入前自燃带位于距工作面（40-120）m的范围内，最大宽度为78m；烟道气注入后自燃带位于距工作面（49-62）m，最大宽度为9.5m，自燃带面积明显变小，并在注气口形成了耗氧汇。烟道气的动态运移规律显示，采空区数值计算应在以雷诺数为判定依据的基础上分区选择计算模型。通过采空区内不同位置烟道气运移连续监测，可获得采空区高效防灭火合理注入参数。

Based on the concept of cleaner production,the feasibility of applying the flue gas in mine pithead power to fire prevention and extinguishing in goaf was numerically studied by taking the mechanized caving mining face 11-214 of Caocun coal mine as example. The heterogeneity porosity and multi-component gas transport equations were introduced into the mathematical model. The results showed that the area of ＆quot;spontaneous combustion zone＆quot;in goaf turned small obviously. The range of＆quot;spontaneous combustion zone＆quot; was away from working face about 40-120m before flue gas injection,and the data was 49-62m after flue gas injection. At the same time,the maximum width of ＆quot;spontaneous combustion zone＆quot; in goaf decreased from 78m to 9. 5m after injecting the flue gas,and the sink terms of oxygen consumption was formed in the port of gas injection. The migration law of flue gas showed that the numerical calculation of goaf should select the different computation model based on the judgment basis of Reyn-olds number. Through the continuous monitoring on the migration of flue gas at different locations in goaf,the rea-sonable parameters of flue gas injection were obtained for high efficient fire prevention.