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| Influence of Cohesive Zone Shape on Solid Flow in COREX Melter Gasifier by Discrete Element Method |
| Li-hao HAN1,Zhi-guo LUO1,Heng ZHOU1,Zong-shu ZOU1,Yu-zhu ZHANG1,2 |
1. School of Materials and Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China
2. College of Metallurgy and Energy, Hebei United University, Tangshan 063009, Hebei, China |
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Abstract Based on the principle of discrete element method (DEM), a 2D slot model of a COREX melter gasifier was established to analyze the influence of cohesive zone shape on solid flow, including mass distribution, velocity distribution, normal force distribution and porosity distribution at a microscopic level. The results show that the cohesive zone shape almost does not affect the particle movement in the upper shaft and deadman shape. The particles in the lower central bottom experience large normal force to support the particles above them, while particles around the raceway and in the fast flow zone exhibit weak force network. The porosity distribution was also examined under three kinds of cohesive zones. Like the velocity distribution, the whole packed bed can be divided into four main regions. With the increase of cohesive zone position, the low porosity region located in the root of cohesive zone increases. And the porosity distribution becomes asymmetric in the case of biased cohesive zone.
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Received: 23 September 2013
Published: 13 April 2015
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2015, Vol. 22 
