Analysis on influences of feeding flow rate on flow characteristics in deep-sea ore hydraulic transport equipment
XU Hailiang1,2*, ZHOU Yongxing1, YANG Fangqiong1,2, WU Bo1,2
1. School of Mechanical and Electrical Engineering, Central South University, Changsha, Hunan 410083, China; 2. State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha, Hunan 410083, China
Abstract A three-dimensional fluid domain model of deep-sea ore transport equipment, which consists of a storage tank, a bell valve and a separator, was established, then the solid-liquid two-phase flow field in the equipment was simulated based on the computational fluid dynamics software-Fluent to study effects of feeding flow rate on solid-liquid flow pattern and operational performance of the equipment. Specially, influences of feeding flow rate on ore particle concentration, velocity and pressure distribution in the equipment were compared, and then ore particle velocity and slurry separation efficiency were analyzed. The results show that the average concentration of ore particles in different sections of the storage tank keeps being around 8 kg/m3, but the maximum concentration increases obviously when the feeding flow rate varies in the range of 200-320 m3/h. With increasing feeding flow rate, the fluid motion is more complicated, and the flow becomes even more chaotic, and the local reverse flow is more significant. The slurry pressure in the storage tank increases gradually, and the static pressure gradient is similar to each other in different sections, but the maximum dynamic pressure varies considerably. with the increase of feeding flow rate, the efficiency of ore slurry separation decreases, i.e. less ore particles flow into the storage tank and more particles deposit on bottom of the separator. In consequence, the feeding flow rate should be controlled at less than 280 m3/h under actual operational conditions of the equipment.
XU Hai-Liang-,*,ZHOU Yong-Xing- et al. Analysis on influences of feeding flow rate on flow characteristics in deep-sea ore hydraulic transport equipment[J]. Journal of Drainage and Irrigation Machinery Engin, 2019, 37(7): 618-624.
ZOU Weisheng, HUANG Jiazhen. Lifting technology for deep sea mining of manganese nodules[J]. Mining and metallurgical engineering, 2006, 26(3):1-5.(in Chinese)
XU Hailiang, ZHOU Gang, WU Wanrong, et al. Numerical calculation and analysis of solid-liquid two-phase flow in tank transporting equipment for deep-sea mining[J]. Journal of Central South University(science and technology), 2012, 43(1):111-117.(in Chinese)
LEI Tingwu, LIU Han, PAN Yinghua, et al. Runoff and inflow runoff measurement method and model for slope rainfall infiltration performance [J]. Science in China(series D),2005,35(12): 1180-1186.(in Chinese)