Table of Contents
ISRN Mechanical Engineering
Volume 2011 (2011), Article ID 324659, 12 pages
http://dx.doi.org/10.5402/2011/324659
Research Article

Heat and Mass Transfer in Reduction Zone of Sponge Iron Reactor

1Department of Mechanical System Engineering, Kumamoto University, Kumamoto 860-8555, Japan
2Department of Chemical Engineering, Bandung Institute of Technology, Bandung 40132, Indonesia

Received 13 March 2011; Accepted 14 May 2011

Academic Editor: S.-H. Chuang

Copyright © 2011 Bayu Alamsari et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Numerical prediction is performed on reduction zone of iron ore reactor which is a part of counter current gas-solid reactor for producing sponge iron. The aim of the present study is to investigate the effect of reduction gas composition and temperature on quality and capacity of sponge iron products through mathematical modeling arrangement and simulation. Simultaneous mass and energy balances along the reactor lead to a set of ordinary differential equation which includes kinetic equations. Kinetic equations of reduction of hematite to iron metal, methane reforming, and water gas shift reaction are taken into account in the model. Hydrogen and carbon monoxide are used as reduction gas. The equations were solved by finite element method. Prediction shows an increase in H2 composition while an attenuation of CO produces higher metallization degree. Metallization degree is also increased with an increase in gas inlet temperature. It is found that reduction gas temperature over 973°C (1246 K) is not recommended because the formation of sticky iron will be initiated.