Flow Characteristics of Air-lift Pumps for Deep-sea Mining Using Enlargement Conveying Pipe and/or Back-pressure Device.
Flow Characteristics of Air-lift Pumps for Deep-sea Mining Using Enlargement Conveying Pipe and/or Back-pressure Device.
复制标题
使用扩容输送管和/或背压装置的深海采矿气升泵的流量特性。
DOI：
10.2473/shigentosozai.113.333
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
T. Masuyama
中科院分区：
文献类型：
--
作者：
N. Hatakeyama;H. Takahashi;T. Saito;T. Masuyama
在深海采矿条件下，由于空气的膨胀和相应的速度非常大，导致固相流向输送管出口的速度变得非常大，因此在大流量的供应空气下预计会出现出口周边单元的磨损。本文介绍了深海采矿用气升泵的流量特性并讨论了对策方法。即对输送管端部采用一级扩管和/或在输送管出口处采用背压装置加余压的气升泵的流动工况进行数值模拟。因此，发现出口处的固相速度显着降低，几乎保持了提升浆料的剩余流量。并论证了主输送管段和扩大输送管段固相最大流速相等的最合适的扩大输送管长度。因此，可以为更实际地设计用于深海采矿的气升泵提供指南和基础数据。
In deep-sea mining conditions, abrasion on periphery units of the outlet is predicted at large flow rates of supplied air, because the velocity of solid-phase becomes very large toward the outlet of the conveying pipe owing to very great expansion of the air and corresponding velocities. In this paper, we present flow characteristics of air-lift pumps for deep-sea mining and discuss methods of the countermeasure. That is, some numerical simulations are performed for the flow conditions of air-lift pumps applied one-stepped enlargement pipe in the end part of conveying pipe and/or added excess pressure using back-pressure device at the outlet of conveying pipe. Consequently, it is found to reduce the velocity of solid-phase at the outlet considerably, almost remaining flow rate of lifting slurry. And we demonstrate most appropriate length of enlargement conveying pipe that maximum velocities of solid-phase became equal in main conveying pipe section and enlargement conveying pipe section. As a result, a guideline and fundamental data to design air-lift pumps for deep-sea mining more practically could be shown.