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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 |
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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.
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Received: 09 June 2017
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[1]刘少军,刘畅,戴瑜. 深海采矿装备研发的现状与进展[J]. 机械工程学报,2014,50(2):8-18. LIU Shaojun,LIU Chang,DAI Yu.Status and progress on researches and developments of deep ocean mining equipments[J].Journal of mechanical engineering, 2014,50(2):8-18.(in Chinese)[2]LIU Shaojun, HU Jianhua, ZHANG Ruiqiang, et al. Development of mining technology and equipment for seafloor massive sulfide deposits[J]. Chinese journal of mechanical engineering,2016,29(5):863-870. [3]CHUNG J S, OLAGNON M. New research direction in deep-ocean technology developments for underwater vehicles and resources[J]. International journal of offshore and polar engineering, 1996, 6(4): 241-243.[4]邹伟生,黄家帧.大洋锰结核深海开采扬矿技术[J]. 矿冶工程, 2006, 26(3):1-5. 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)[5]杨放琼,徐海良,李立.一种深海采矿阀控式清水泵矿石水力提升设备:中国,201410519903.0[P].2014-10-08.[6]徐海良,周刚,吴万荣,等. 深海采矿储料罐输送设备固液两相流数值计算与分析[J]. 中南大学学报(自然科学版), 2012, 43(1): 111-117. 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)[7]黄剑峰,张立翔,姚激,等.水轮机泥沙磨损两相湍流场数值模拟[J].排灌机械工程学报,2016,34(2):128-133. HUANG Jianfeng,ZHANG Lixiang,YAO Ji,et al. Numerical simulation of two-phase turbulent flow in Fran-cis turbine passage on sediment erosion[J]. Journal of drainage and irrigation machinery engineering,2016,34(2): 128-133.(in Chinese)[8]李秋龙. 赤泥沉降槽内多相流动和絮凝沉降的数值仿真与优化[D].长沙:中南大学,2014:26-27. |
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