PR-377-272 - 2019 AISTech Conference Proceedings

A Raceway Model Based on Open-Source Software

Bösenhofer, Wartha, Jordan, Harasek et al.

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In recent years modeling has become a vital part in the optimization of industrial plants. The main benefit of modeling is the identification of trends by modifying operational parameters. Modeling results also provide a more detailed insight in the actual processes within the plant and help identify and remove bottlenecks. An interesting use case of such an approach is the injection of alternative reducing agents (ARA), e.g. coal or plastics, into the raceway zone of blast furnaces or smelting gasifiers. Complete thermo-chemical conversion of ARAs within the oxygen-rich zone in the vicinity of the tuyeres is essential to ensure high coke replacement ratios. ARAs being only partially converted in the tuyere zone lead to an increase in coke demand to compensate the material losses. Additional coke or coal rates have to compensate for these losses. Measurements and experimental investigation of ARA conversion within the raceway is difficult or impossible due to the harsh conditions. Temperatures exceeding 2000 °C, pressures of up to 5 bar(a), and incandescing, flying particles interfere measurements. Therefore, modeling is a promising approach to gain further insights to the processes dominating the ARA conversion.

Keywords: Raceway, Alternative Reducing Agent (ARA), Computational Fluid Dynamics (CFD), Modelling, OpenFOAM®, blast furnace