气力提升管三相流中气相状态对固相运动影响
发布时间：2019-07-26 07:40
【摘要】：钻孔水力开采中利用气力提升系统对地下矿浆进行提升时,气体状态(气相值的大小及其运动特性)对矿浆中矿石的运动及其提升效率将会产生重要影响。基于三相流理论和气泡动力学理论建立了提升管中固相运动速度模型,以陶瓷球形颗粒模拟矿石,利用自行设计的小型气力提升系统实验研究不同运行参数(气量值、淹没率)对颗粒提升量的影响,采用高速摄像技术获取不同气量值下管内气-液-固三相流运动图像序列,通过图像处理技术分析气相对固相运动的影响机理并与实验结果相佐证。结果表明:不同气量值下,气泡对颗粒的作用程度及作用形式并不相同;当气量值较小时,液体对颗粒运动影响较大,此时颗粒数量少、速度低且多随气-液混合相沿管壁位置提升;随气量值的增加,气泡对颗粒及液体提升作用明显,固-液混合相浓度及提升速度均趋于最大值并整体向管芯运动,相对于管壁,管芯处颗粒提升速度较大,此时管内整体呈不规则螺旋上升;持续增加进气量,气体流速过高,管内紊动加强,颗粒非连续提升且固-液混合相浓度显著降低。与淹没率相比,气量值的变化对管内固相运动的影响更为显著。实验结果与理论分析吻合较好,对钻孔水力开采工程应用具有指导意义。
[Abstract]:When the underground slurry is promoted by pneumatic lifting system in drilling hydraulic mining, the gas state (the size of gas phase value and its movement characteristics) will have an important influence on the movement and efficiency of ore in pulp. Based on the three-phase flow theory and bubble dynamics theory, the solid phase velocity model in the riser is established. The ceramic spherical particles are used to simulate the ore. The effects of different operating parameters (gas value, submergence rate) on the particle lifting amount are studied by using the small pneumatic lifting system designed by ourselves. The moving image sequences of gas-liquid-solid three-phase flow in the tube with different gas values are obtained by using high-speed camera technology. The influence mechanism of gas on solid state motion is analyzed by image processing technology and supported by the experimental results. The results show that the degree and form of action of bubbles on particles are different under different gas values, and when the gas value is small, the liquid has a great influence on the movement of particles, at which time the number of particles is small, the velocity is low and the position of gas-liquid mixture increases along the wall of the pipe. With the increase of gas value, the effect of bubbles on particles and liquids is obvious, the concentration and lifting speed of solid-liquid mixed phase tend to the maximum and move to the core as a whole, compared with the wall of the tube, the particle lifting speed at the core is larger, and the whole tube rises irregularly, and the gas inlet is continuously increased, the gas flow rate is too high, the turbulence in the tube is strengthened, the particle is discontinuously raised and the concentration of solid-liquid mixture phase is significantly decreased. Compared with the submergence rate, the change of gas value has a more significant effect on the solid phase movement in the tube. The experimental results are in good agreement with the theoretical analysis, which is of guiding significance for the application of drilling hydraulic mining engineering.
【作者单位】： 湖南工业大学水射流研究所;湖南人文科技学院能源与机电工程学院;陕西火石咀煤矿有限公司;
【基金】：国家自然科学基金资助项目(51374101) 湖南省研究生科研创新资助项目(CX2017B686) 湖南省教育厅科研资助项目(16C0464)
【分类号】：TD825
本文编号：2519433
[Abstract]:When the underground slurry is promoted by pneumatic lifting system in drilling hydraulic mining, the gas state (the size of gas phase value and its movement characteristics) will have an important influence on the movement and efficiency of ore in pulp. Based on the three-phase flow theory and bubble dynamics theory, the solid phase velocity model in the riser is established. The ceramic spherical particles are used to simulate the ore. The effects of different operating parameters (gas value, submergence rate) on the particle lifting amount are studied by using the small pneumatic lifting system designed by ourselves. The moving image sequences of gas-liquid-solid three-phase flow in the tube with different gas values are obtained by using high-speed camera technology. The influence mechanism of gas on solid state motion is analyzed by image processing technology and supported by the experimental results. The results show that the degree and form of action of bubbles on particles are different under different gas values, and when the gas value is small, the liquid has a great influence on the movement of particles, at which time the number of particles is small, the velocity is low and the position of gas-liquid mixture increases along the wall of the pipe. With the increase of gas value, the effect of bubbles on particles and liquids is obvious, the concentration and lifting speed of solid-liquid mixed phase tend to the maximum and move to the core as a whole, compared with the wall of the tube, the particle lifting speed at the core is larger, and the whole tube rises irregularly, and the gas inlet is continuously increased, the gas flow rate is too high, the turbulence in the tube is strengthened, the particle is discontinuously raised and the concentration of solid-liquid mixture phase is significantly decreased. Compared with the submergence rate, the change of gas value has a more significant effect on the solid phase movement in the tube. The experimental results are in good agreement with the theoretical analysis, which is of guiding significance for the application of drilling hydraulic mining engineering.
【作者单位】： 湖南工业大学水射流研究所;湖南人文科技学院能源与机电工程学院;陕西火石咀煤矿有限公司;
【基金】：国家自然科学基金资助项目(51374101) 湖南省研究生科研创新资助项目(CX2017B686) 湖南省教育厅科研资助项目(16C0464)
【分类号】：TD825
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1 王晓明;非均匀颗粒气力提升的实验研究[D];湖南工业大学;2015年
，本文编号：2519433
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