Performance of the static air classifier in a Verticle Spindle Mill

Li, Hong, He, Yaqun, Shi, Fengnian, Zuo, Weiran, Zhou, Nianxin, Wei, Hua, Wang, Shuai and Xie, Weining (2016) Performance of the static air classifier in a Verticle Spindle Mill. Fuel, 177 8-14. doi:10.1016/j.fuel.2016.02.090

Author Li, Hong
He, Yaqun
Shi, Fengnian
Zuo, Weiran
Zhou, Nianxin
Wei, Hua
Wang, Shuai
Xie, Weining
Title Performance of the static air classifier in a Verticle Spindle Mill
Journal name Fuel   Check publisher's open access policy
ISSN 0016-2361
Publication date 2016-08-01
Year available 2016
Sub-type Article (original research)
DOI 10.1016/j.fuel.2016.02.090
Open Access Status Not Open Access
Volume 177
Start page 8
End page 14
Total pages 7
Place of publication Oxford, United Kingdom
Publisher Elsevier
Collection year 2017
Language eng
Formatted abstract
In order to investigate the classification performance of static air classifier in an industrial Vertical Spindle Mill (VSM), sampling ports were drilled on the mill shell and new on-line sampling methods were designed. Size and density compositions of classifier feed, classifier reject and Pulverized Fuel (PF) were analyzed. Calculation was done about the circulating ratio within the VSM and classification efficiency of the classifier with several surveys. Influences of three operation variables, namely coal type, air rate and roller load pressure on the classifier performance were investigated. Result shows that circulating ratio is around 7 and 10. Yield of particles with −90 μm decreases from 32% in classifier feed to 24% in classifier reject after classification, which indicates the poor classification of classifier. Density composition of samples in classifier feed, classifier reject and pulverized fuel are quite different. Dominant density levels are −1.4 g/cm3 and +1.8 g/cm3 in pulverized fuel due to size reduction and liberation. Results of classification efficiency show that the variation of the air rate in a range between 62.8 t/h and 53.2 t/h has limited influence on the efficiency, however, classification efficiency decreases significantly when air rate is smaller than 44 t/h. In addition, both the coal type and the roller load pressure have indirectly influence on the classification efficiency by affecting the flow rate of the classifier feed.
Keyword Vertical Spindle Mill
On-line sampling
Classifier efficiency
Circulating ratio
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
Sustainable Minerals Institute Publications
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Created: Tue, 15 Mar 2016, 10:06:26 EST by Karen Holtham on behalf of Julius Kruttschnitt Mineral Research Centre