Analysis of the Moving Packed Bed and Gas Flow in Blast Furnace

• Main Authors: Li-Yung Lu, 呂李元
• Other Authors: 楊照彥
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/83831483185090540816

碩士 === 國立臺灣大學 === 應用力學研究所 === 95 === Blast furnace plays an important process in the fountainhead of iron and steel industry. In the past, the manufacture process is depending on the technician’s experience and skill. If the guidance of skill is not successfully to make the new technicians understand, the property of steel production will be poor. Nowadays we have to understand the phenomenon inside of blast furnace in order to control the process of steel production. Blast furnace is a complicated reactor which contains chemical reaction and phase transfer. We don''t consider the chemical reaction and phase transfer in blast furnace in this research but focus on the motion of solid particles descending and the phenomenon of gas flow in the packed bed. The moving packed bed is discussed by the continuity equation of fluid dynamic. It uses the Eulerian-Eulerian two phase model to discuss the phenomenon of countercurrent flow. It doesn''t only discuss the transient and convection part of fluid dynamics but also discuss the particle interaction which is effected by solid collision. The solid collision is from kinetics theory and the effect of solid collision produces the normal force and friction. The drag force between descending packed bed and gas flow is discussed by the drag coefficient of Ergun''s equation. The calculation tool is ANSYS-CFX and the numerical method is finite volume method. It uses implicit method to calculate the steady state flow and use the correction method of SIMPLE and Rhie-Chow to obtain the corrected result. This simulation is to discuss the effect of descending solid and gas flow under the different distribution of diameter. It provides the base of further discussion of chemical reaction and phase transfer of blast furnace.