• Theoretical Study of COG And COG/BOF Gas Injection in a Blast Furnace

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This week a paper regarding modelling approach in the combustion steelwork’s by-product gas have been published in the IFRF Combustion Journal (http://www.journal.ifrf.net), and these are:

Theoretical Study of COG and COG/BOF Gas Injection in a Blast Furnace


Dietmar Andahazy, Gerhard Löffler, Franz Winter, Christoph Feilmayr and Thomas Bürgler

This article discusses the application of various modeling approaches to the performance of coke oven gas (COG) and a mixture of COG and the gas from a basic oxygen furnace (BOF) as injectants in the tuyere of a blast furnace. The ignition, species concentrations and temperatures are modelled in this paper and a comparison is made for the two fuels.


Dietmar Andahazy or Franz Winter
CD Laboratory for Chemical Engineering at High Temperatures
Vienna University of Technology
Getreidemarkt 9/166
1060  Vienna

Tel: 43 1 58801 15953
Fax: 43 1 58801 15999
email: andahazy@mail.zserv.tuwien.ac.at


Because of the availability of gases from the coke production and the basic oxygen furnace (BOF) process in an integrated metallurgical plant, a project of utilization of these gases is proposed. The gases are injected into the blast furnace to substitute reducing agents like heavy oil. The aim of this paper is to study the combustion characteristics of coke oven gas (COG) and a mixture of COG and gas from the BOF.

The modeling approaches used are the thermodynamic equilibrium, the plug flow reactor (PFR) model with detailed chemistry (with and without consideration of the mixing time) and Computational Fluid Dynamic (CFD) modelling. Each approach leads to additional aspects for an improved understanding of the combustion processes.

The COG/BOF gas mixture ignites earlier than the COG gas because of its different composition. The combustion of COG leads to a higher temperature due to its higher net calorific value so that the thermal strain on the tuyere is higher. The combustion of the COG gas results in higher H2O, H2 and CO and lower O2 and CO2 concentrations. Energy balance calculations show that the efficiency of the Regenerative System can be up to 25% higher than that of the recuperative system, mainly due to very low temperature of flue gases for RS operation. Although, the preheated air temperature used for combustion was much higher in the case of the regenerative system (in some tests as high as 960oC), the NOx emission was found to be almost the same in both cases.

Key words: blast furnace, gas injection, modeling, combustion


The full paper may be downloaded from the server, in the “New Papers” section (http://www.journal.ifrf.net/articles.html), by clicking on the Acrobat PDF icon alongside the title.

Publication in the Journal

The Editor-in-Chief (See associated article in this edition of the MNM) would like to remind all potential authors that publication in the Journal is open to all. If you have interesting results to publish in the field of, or related to, industrial combustion, we invite you to prepare a paper according to the guidelines given in the Author’s Guide on the website


Papers may be regular “articles” (typically up to 20 pages) or Communications (typically up to 4/5 pages). Review papers can of course be longer. Remember that figures and graphics in general can be in full colour. This advantage should be encouraged.

All manuscripts and associated files, proposed for publication should be sent by the Corresponding Author in a compressed/zip file, as an email attachment to journal@ifrf.net. This file should include a statement that the proposal’s content is unpublished material that has not being submitted for publication elsewhere. When an article by the author(s) is cited in the proposed article as “in press”, a copy of this article should accompany the proposed article and should be included in the compressed file.

The Editor-in-Chief looks forward to receiving your proposals.