Timo Mäki, Jari Ruuska

Simulation of a Steel Factory's Closed Gas Circulation

This paper presents the simulation possibilities of a steel factory's closed gas circulation the project name is ReGenGas. A real composition of a steel factory gases is used. The main aim in this project is to decrease carbon dioxide emission into the air and/or to re-use it to produce more hot metal or some chemicals. Actual processes will be compared to the developed system in this project. Trial runs in laboratory scale help to establish a use of non-ideal gases and potentiality to recirculation these gases.

The simulation tool will be done with Matlabs Simulink and will be based on the data collected from the test campaigns. The real measurements of the experimental data and the simulated results will be compared. Simulation will consist of models for the mixing of pure gases and for the mixed real process gases like coke oven and blast furnace gases. In laboratory trials the variables are for example the composition of the gas, the operating temperature, recirculation rate, catalysts dimensions and composition and the characters of the iron charge.

The test equipment and trials are based on the calculated results of Outokumpu Technology's HSC-software done in the same research groups earlier CO2H2-project. In this project the lab scale test runs are made to certify earlier calculations. Expert knowledge and an experimental design matrix will be utilized.

The goal of simulation and dynamic modeling is the preliminary information of a re-using of gases in a steel factory and designing of trials. As a result of this research it is possible to decrease a steel factory's carbon dioxide emissions and at the same time the production of hot metal increases. The feed gases in test runs will be H2, N2, CO, CO2, H2O, CH4 and O2.

This ReGenGas -project is financed by the National Technology Agency of Finland TEKES, Outokumpu Technology Oy, Neste Oil Oyj and Ehovoc Oy. Research partners in this consortium are University of Oulu 3 laboratories and bo Akademi Turku, Finland.