摘要
采用CO_(2)相变爆破代替传统炸药爆破作为输入能量,对低渗砂岩铀矿层进行“爆破增渗”物理改造,对于提高我国天然铀产量具有十分重要的意义。目前工业化生产的CO_(2)致裂器主要针对煤岩开采等领域设计,在爆破增渗工况中适应性不佳。为此,对传统致裂器泄能头进行多孔设计、平衡各泄气孔压力,为设计出针对爆破增渗领域的“各气孔压力大且均匀”的致裂器提供理论参考。以RNG k-ε湍流模型为理论基础,基于计算流体动力学(CFD)对致裂器泄能头部分进行了数值仿真试验,分析了泄能头内的气体流动规律及压力分布特征,探讨了位置关系和孔径特征两个因素对泄气孔压力变化的影响规律。结果表明:为保持气孔压力的稳定输出,对称式分布的泄气孔优于交错式分布的泄气孔布置;同时,泄气孔直径设置为由首部至端部递增的非均匀式,可有效降低各气孔之间的压差。上述分析进一步表明:非均匀对称式的泄能头类型更符合爆破增渗的需求。
Using CO_(2) phase change blasting instead of traditional explosive blasting as input energy,the physical transformation of"blasting and increasing permeability"of low-permeability sandstone uranium deposit is of great significance to improve the production of natural uranium in China.At present,the industrialized CO_(2) fracturing device is mainly designed for coal and rock mining and other fields,and has poor adaptability in blasting seepage increasing conditions.Therefore,the porous design of the discharge head of the traditional crack maker is carried out to balance the pressure of each vent hole,which provides a theoretical reference for the design of the crack maker with"large and uniform pressure of each vent hole"in the field of blasting infiltration.RNG k-εbased on the turbulence model,the numerical simulation test of the energy discharge head of the crack breaker is carried out based on computational fluid dynamics(CFD).The gas flow law and pressure distribution characteristics in the energy discharge head are analyzed,and the influence law of the position relationship and the pore size characteristics on the pressure change of the vent hole is explored.The results show that in order to keep the stable output of pore pressure,the symmetrical distribution of vent holes is better than the staggered distribution of vent holes;At the same time,the diameter of the vent hole is set as a non-uniform type from the head to the end,which can effectively reduce the pressure difference between the pores.The above analysis results furhter show that the type of non-uniform and symmetrical energy discharge head is more in line with the needs of blasting infiltration.
作者
王伟
李亚东
郑永香
尹超
李朝博
路小茜
周星宇
WANG Wei;LI Yadong;ZHENG Yongxiang;YIN Chao;LI Chaobo;LU Xiaoxi;ZHOU Xingyu(State Key Laboratory of Mechanics Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Key Laboratory of Ministry of Education of Roads and Railway Engineering Safety Control,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Hebei Metal Mine Safety and Efficient Mining Technology Center,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Hebei Academy of Emergency Management Sciences,Shijiazhuang 050051,China)
出处
《金属矿山》
CAS
北大核心
2022年第7期50-57,共8页
Metal Mine
基金
国家自然科学基金项目(编号:51979170,U1967208)
河北省自然科学基金项目(编号:E2021210128,E2021210036)。
