ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Ironmaking
Numerical Investigation of Coke Collapse and Size Segregation in the Bell-less Top Blast Furnace
Mingyin KouShengli WuHeng ZhouYimin YuJian Xu
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2018 Volume 58 Issue 11 Pages 2018-2024

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Abstract

The coke collapse phenomenon significantly affects the burden and gas distributions, and further gas utilization and CO2 emission. Therefore, it is necessary to investigate the coke collapse in blast furnace. A three dimensional model of bell-less top blast furnace is established based on discrete element method (DEM). The effects of chute angle, rotating speed and sinter amount on the coke collapse charateristics are then investigated based on this model. The results show that coke profile changes a lot after its collapse and the collapse region is more than 40% of the furnace radius. Sinter amount affects the coke collapse amount much, followed by chute angle and chute rotating speed. The coke collapse region is affected most by sinter amount, followed by chute rotating speed and chute angle. Large chute angle, higher rotating speed and small sinter amount are recommended for practical operation since they help to obtain a lighter coke size segregation along radius.

Burden profiles in the simulation of base model (a) before collapse; (b) after collapse; (c) coke collapse line. (Online version in color.) Fullsize Image
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© 2018 by The Iron and Steel Institute of Japan
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