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Developments of spiral separation technology for retreatment of fines from coal dumps
Published in Vladimír Strakoš, Vladimír Kebo, Radim Farana, Lubomír Smutný, Mine Planning and Equipment Selection 1997, 2020
This characteristics related to grained part of coal slimes which is not suspended in turbulent flow. As to fine particles, passing in suspended state by turbulent flow of water along the spiral separator sluice It is necessary to say that for such case ΔU = 0 and separation in depends of density does not take place. Such particles according to condition of parting of light product from heavy fraction retaine in light product irrespective of particles density.
Effect of underflow diameter on the separation performance of natural gas hydrate desanding and purification under back pressure
Published in Petroleum Science and Technology, 2023
Dangfei Wang, Guorong Wang, Lin Zhong, Xing Fang
For the separation performance of the hydrate separator, many scholars have carried out related research. Qiu et al. (2020) used the single factor and computational fluid dynamics (CFD) methods to optimize the purification separator structure parameters, and investigated the separation performance form the aspects of solid particle size, inlet flow rate, inlet hydrate, and sand volume fractions. Fang et al. (2022) carried out adaptability analysis of operating parameters of hydrate cyclone separator based on CFD simulation, and provided the basis for using downhole hydrocyclones in the process of NGH solid fluidized mining. Li et al. (2019) designed the spiral separator to study the effects of sand concentration, hydrate concentration and inlet velocity on separation performance, respectively. It is considered that the concentration of sand has a great influence on the separation efficiency, and the separation performance can be improved by increasing the flow rate. Chang et al. (2021) designed a hydrocyclone suitable for subsea gas hydrate extraction, and studied the hydrocyclone performance on the effects of operating parameters and geometric parameters. In order to obtain the optimal operating parameters and ensure their reliability and feasibility, Chen, Wu, et al. (2018) and Chen, Feng, et al. (2018) investigated the effects of different parameters on separation efficiency by using the hydrocyclone with double cone-inner cone structure. However, these works are all conducted without considering Puo.