離散要素型解法による高炉の数値解析

抄録

Ironmaking process is currently focused on the decreased reducing agent operation of a blast furnace in order to decrease CO₂ emissions. Because the coke ratio is reduced in this operation, causing a huge pressure drop, it has become increasingly important to understand the in-furnace phenomena using the non-empirical method. The discrete element method (DEM), Euler-Lagrange coupling method (DEM-CFD), and fully-Lagrangian method (e.g. SPH, MPS) simulation were carried out to analyze the momentum, heat and mass transfer between the fluid and the particles in a packed bed. These developed numerical methods are using discrete element type model, which can track the movement of the solid or the fluid phase directly. The optimum bed structure for decreased reducing agent operation can be clarified by application of these methods. Moreover, three-dimensional information for understanding in-furnace local flow structure can be also obtained with high spatial resolution. This paper explains the outline of the latest numerical model of blast furnace.