钻孔水力开采用气力提升系统性能研究

采用与实际作业相近的槽内供砂方式并引入水射流喷嘴研究了钻孔水力开采用气力提升系统的性能变化规律。结果表明: 水射流喷嘴达到一定数量(N)即可消除槽底压持效应, 起到提高颗粒质量流量与提升效率的目的; 水射流喷嘴分布的非均匀性过高与过低均不利于增强气力提升性能; 水射流喷嘴在气举头埋入砂层后(即气举头底部至砂床表层距离H<0)可显著增加颗粒质量流量与提升效率。

Performance of Airlift System in Hydraulic Borehole Mining

A new particle feeding method, which is similar to the real operation and combined with the introduction of waterjet nozzles, was adopted in the process of hydraulic borehole mining for investigating the performance of airlift system. Results show that chip hold-down effect can be eliminated with certain numbers of waterjet nozzles (N), leading to an increase in the mass flow rate and lifting efficiency. However, the non-uniform distribution of jet nozzles won′t be beneficial to promoting airlift performance. With the waterjet nozzle embedded into the sand layer (the distance between the bottom of air-injector and the surface of sand layer  less than 0), both solid particle mass flow rate and lifting efficiency can be remarkably improved.