瓦斯抽放孔射流排水排渣方法及实验研究

针对煤矿俯孔积存水和煤渣影响瓦斯抽放效果问题,提出射流排水排渣方法,设计加工出射流深孔排水排渣装置,采用正交试验法验证了该方法可行性,并研究工作参数对其性能影响规律.结果表明:压缩空气压力p对其性能影响最大,随着p值增大排水渣量呈现先增多后减少趋势,存在最优空气压力值p*使其性能最优；存在临界孔深Hnp,即孔深小于Hnp时排出水渣量保持不变,孔深大于Hnp时排出水渣量逐渐减小；其他条件不变,随着孔内水深升高,排水渣量逐渐增大.射流排水排渣方法可行,操作简单,能有效排出瓦斯抽放孔中的水和煤渣.

Method and Experimental Study on Draining Water and Cinder by Jet in Gas Drainage Hole

Water and coal cinder in the downward drainage holes influence the effect of gas drainage.A new method is proposed to drain water and coal cinder by jets.A set of device for drain water and cinder by jets is designed.The feasibility of this method is verified by using orthogonal test and the influences of working parameters on the device performance are also researched.The results show that the device performance is most affected by compressed air pressure p.The amount of water and coal cinder in-crease at first and then reduce as p increases indicates that there exists an optimal air pressure p* making the device performances the best.There is a critical depth Hnp of drainage holes.When the depth of hole is less than Hnp,the amount of water and coal cinder keep invariant.However,the amount decreases gradually when the depth of hole is more than Hnp.If all other conditions do not change,the amount of water and coal cinder increase gradually as the water depth in the holes increase.The p* of the device for water and coal cinder drainage is 0.55 MPa obtained by experiments.The method of draining water and coal cinder by jets is feasible and simple to operate and available to drain water and coal cinder ef-fectively in the drainage holes of coal mine.