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| Optimization measures of segregation during charging process of bell-less top blast furnace with two parallel hoppers |
| XU Wen-xuan1，CHENG Shu-sen1，NIU Qun1，DONG Zhi-bao2，CHEN Yan-bo2 |
（1. School of Metallurgical and Ecological Engineering， University of Science and Technology Beijing， Beijing 100083， China
2. Ironmaking Department， Shougang Jingtang United Iron and Steel Co.， Ltd.， Tangshan 063200， Hebei， China） |
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Abstract Based on an 5 500 m3 blast furnace in China， a three dimensional geometrical model of bell-less top system with two parallel hoppers was established， and the motion process of burdens from the bunker to the stock surface was analyzed by the discrete element method， and the calculated results were verified by a 1：1 scale model experiment. In addition， the effect of chute structures， including the smooth semicircular chute， the rough semicircular chute， the smooth rectangular chute and the rough rectangular chute， and the central throat tube diameter， such as 600， 650 and 730 mm， on the flux segregation and the falling point segregation were also investigated. The calculated results show a well agreement with the experimental results. The rectangular chute is benefit to improve the falling point segregation and the flux segregation during the charging process of the blast furnace with two parallel hoppers. Meanwhile， the rock box structure in the chute is also favor to improve the segregation further. Using the 600 mm central throat tube is helpful to improve the falling point segregation and the flux segregation during the charging process of blast furnace with two parallel hoppers. In the case of unplugging in the throat， it is helpful to improve the segregation by using the smallest tube.
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Received: 28 March 2018
Published: 26 October 2018
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2018, Vol. 53 
