2017 年 103 巻 6 号 p. 305-314
The motions of particles and gas in the nearly full scale sintering beds were simulated to elucidate the effect of the magnetite ore blending on the particle agglomeration and the large scale crack formation by the simultaneous calculation of the Navier-Stokes equations and the Lagrangian DEM equations based on the sintering model in which the phase change of particles and the cohesion forces and the resistance forces due to the liquid films among particles were considered. In this study containing ratios of magnetite ores are varied from 0 mass% to 19.3 mass%. Calculated results show that the large agglomerates and cracks are not formed and the homogeneous configurations of particles are produced when the containing ratio of magnetite ores is 19.3 mass%. In the sintering bed with high magnetite containing ratio, for example 19.3 mass%, two or more magnetite ore particles contact to one hematite ore particle on average. This increases the liquid region in which the large viscous interaction forces act among close particles and those forces reduce the particle relative velocities which cause the particle collisions and agglomerations. Magnetite ore particles go into voids by their relatively high mobility in the melting zone and produce the uniform sintering beds. In this condition the final bed shrink ratio which is defined as the ratio of the final bed height and the initial bed height is 85% and it is considered that the sintering cake has the sufficient porosity for air flows.
