论文部分内容阅读
根据综采放顶煤工作面的通风阻力及其通风网络等势图 ,采用释放示踪气体SF6技术 ,确定了综放面进风隅角采空区的漏风风速和采场漏风量及其分布状态。测定了采空区气体浓度和温度的分布状况 ,划分了采空区煤炭氧化三带范围。煤炭氧化自燃模拟试验证明 :常温下煤氧复合的自由基反应生成大量的CO、CO2 气体 ,所产生的热量使采空区煤岩温度升高 10℃。保证采空区流体动力相似 ,便可满足采空区注氮模拟条件。对 2 0 0m长的综放面采空区注氮 ,难以取得有效的惰化效果。综放面无煤柱开采的邻近老空区漏风及自燃发火危险大 ,应在漏风源处注氮 ,配合堵漏和均压措施 ,彻底惰化漏风源
According to the ventilation resistance and ventilation network contour diagram of fully mechanized top coal caving coalface, SF6 technology of releasing tracer gas was used to determine the air leakage rate and the amount of air leakage and the distribution of air leakage in the gob of the fully mechanized caving face status. The distribution of gas concentration and temperature in goaf was determined, and the range of coal oxidation zone in goaf was divided. The simulation test of spontaneous combustion of coal shows that the radical reaction of coal-oxygen complex generates a large amount of CO, CO2 gas at room temperature, and the heat generated increases the temperature of coal rock in goaf by 10 ℃. To ensure that the gob area has similar hydrodynamic forces, the simulation conditions of nitrogen injection in goaf can be satisfied. It is difficult to obtain an effective inerting effect when injecting nitrogen into the gob of 200m long fully mechanized caving face. The danger of air leakage and spontaneous combustion in the adjacent free-air area adjacent to the fully mechanized caving mining face with no coal pillar is large. Nitrogen should be injected at the source of air leakage, and plugging and pressure equalizing measures should be thoroughly adopted to thoroughly de-aerate the source of air leakage