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Numerical model of a shaft furnace operation

Robert Straka (Department of Heat Engineering and Environment Protection, Akademia Gorniczo-Hutnicza im Stanislawa Staszica w Krakowie, Krakow, Poland)
Tadeusz Telejko (Department of Heat Engineering and Environment Protection, Akademia Gorniczo-Hutnicza im Stanislawa Staszica w Krakowie, Krakow, Poland)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Article publication date: 2 May 2017

111

Abstract

Purpose

The model of a shaft furnace operation is presented in this paper. Aim of this model is to predict concentrations of carbon monoxide and dioxide, the temperature of the lava and the heat losses.

Design/methodology/approach

The mathematical model is based on 1D mass and heat balance laws for flue gas, coke and four materials used in a mineral wool production. Process parameters should be optimized for the minimal heat loss and the carbon monoxide concentration while keeping the prescribed lava temperature. The model consists of heterogeneous and homogeneous reactions for coke combustion, dolomite decomposition, rock and coke heating and a rock-melting model. The resulting system of partial differential equations is discretized by the finite volume method and solved with the explicit Euler scheme together with the point-implicit preconditioning of sources in species balance equations.

Findings

Numerical results are compared with the measured data on the pilot-scale device and show good agreement. It is found that in the lower region of the furnace, the large amount of carbon monoxide is present despite high oxygen levels.

Practical/implications

Based on the numerical model, the parameters of the secondary air stream could be studied (position, volume flux, oxygen enrichment and temperature) to decrease levels of carbon monoxide emissions while keeping lava temperature at needed levels.

Originality/value

The paper includes mathematical and numerical model needed for simulation of shaft furnaces in mineral wool industry. It can be used as a valuable tool for design engineers and furnace operators during research or redesign of existing devices.

Keywords

Acknowledgements

Financial support from project No 17.17.110.87140 of the NCBiR The National Centre for Research and Development is acknowledged.

Citation

Straka, R. and Telejko, T. (2017), "Numerical model of a shaft furnace operation", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 27 No. 5, pp. 1172-1184. https://doi.org/10.1108/HFF-04-2016-0157

Publisher

:

Emerald Publishing Limited

Copyright © 2017, Emerald Publishing Limited

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