Numerical study of hot charge operation in ironmaking blast furnace

Charge of hot coke and iron-bearing materials into an ironmaking blast furnace (BF) may bring significant energy and environmental benefits to the BF process. However, there is little information about the quantitative effects of hot charge operation on BF flow and performance. This paper presents a numerical study of multiphase flow, heat and mass transfer in a BF by a process model. The applicability of the model in predicting BF performance is first confirmed by different applications. It is then used to study the effects of hot charge operation at different temperatures. The results are analyzed in detail with respect to BF flow and performance. It is shown that compared to the conventional operation, hot charge operation can lead to an increased productivity, decreased coke rate and CO2 emission, and at the same time, increased gas pressure and top gas temperature. These effects vary with hot charge temperature.

A mathematical model is developed to study ironmaking blast furnace. The model is used to study the effects of hot charge temperature on flow and performance of blast furnace. The coke reduction due to hot charge operation is quantified by controlling the same cohesive zone (CZ) as that of the conventional operation.Figure optionsDownload as PowerPoint slideHighlights
• A mathematical model is developed to study ironmaking blast furnace (BF).
• The model can satisfactorily predict BF performance under different conditions.
• The effects of hot charge temperature on BF flow and performance are quantified.
• The reason behind the coke reduction due to hot charge operation is identified.