Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 35-45 |
| Number of pages | 11 |
| Journal | International Journal of Mineral Processing |
| Volume | 142 |
| DOIs | |
| Publication status | Published - 10 Sep 2015 |
Keywords
- Dense medium cyclone
- Fine particles
- Separation
- Two-fluid model
- Simulation
Cite this
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Numerical investigation of the separation behaviours of fine particles in large dense medium cyclones. / Qi, Z.; Kuang, S.B.; Yu, A.B.
In: International Journal of Mineral Processing, Vol. 142, 10.09.2015, p. 35-45.Research output: Contribution to journal › Article › Research › peer-review
TY - JOUR
T1 - Numerical investigation of the separation behaviours of fine particles in large dense medium cyclones
AU - Qi, Z.
AU - Kuang, S.B.
AU - Yu, A.B.
PY - 2015/9/10
Y1 - 2015/9/10
N2 - Use of large dense medium cyclones (DMCs) is a potential trend in the coal industry but its usage is limited by the poor separation efficiency of fine particles. This paper presents a numerical study of the multiphase flows and performance of DMCs used for coal preparation by means of the two-fluid model. The validity of the model has been verified by various applications. It is used here to study the behaviours of fine particles in a 2-m DMC that is larger than the biggest DMCs reported thus far in the coal industry. The numerical results show that in the extra-large DMC, the poor separation efficiency of fine particles gets worse compared to that of a widely used 1-m DMC. This deficiency is found to be attributed to the strong vortexes developed and the asymmetrical separation zone that can be characterised by the correlation between pressure gradient and tangential velocity. Several modifications with respect to mounting degree, operational Head, conical section length, and inlet number are introduced to improve the performance of the 2-m DMC. It is shown that the separation efficiency of fine particles in the 2-m DMC can be better compared to the 1-m DMC by increasing the Head or conical section length, because such modifications reduce the asymmetrical separation zone and/or amount of vortexes.
AB - Use of large dense medium cyclones (DMCs) is a potential trend in the coal industry but its usage is limited by the poor separation efficiency of fine particles. This paper presents a numerical study of the multiphase flows and performance of DMCs used for coal preparation by means of the two-fluid model. The validity of the model has been verified by various applications. It is used here to study the behaviours of fine particles in a 2-m DMC that is larger than the biggest DMCs reported thus far in the coal industry. The numerical results show that in the extra-large DMC, the poor separation efficiency of fine particles gets worse compared to that of a widely used 1-m DMC. This deficiency is found to be attributed to the strong vortexes developed and the asymmetrical separation zone that can be characterised by the correlation between pressure gradient and tangential velocity. Several modifications with respect to mounting degree, operational Head, conical section length, and inlet number are introduced to improve the performance of the 2-m DMC. It is shown that the separation efficiency of fine particles in the 2-m DMC can be better compared to the 1-m DMC by increasing the Head or conical section length, because such modifications reduce the asymmetrical separation zone and/or amount of vortexes.
KW - Dense medium cyclone
KW - Fine particles
KW - Separation
KW - Two-fluid model
KW - Simulation
UR - http://goo.gl/NxuYb2
U2 - 10.1016/j.minpro.2015.05.006
DO - 10.1016/j.minpro.2015.05.006
M3 - Article
VL - 142
SP - 35
EP - 45
JO - International Journal of Mineral Processing
JF - International Journal of Mineral Processing
SN - 0301-7516
ER -