Effect of impellers on particle mixing behaviour in KR desulphurization process

Abstract

Three types of impellers are developed to improve reagent efficiency in the desulfurization process of hot metal by kanbara reactor stirring method. The movement and dispersion behavior of particles are investigated using the CFD technology. The flow structure, particle volume fraction distribution and mixing time are taken as the characteristics to describe the entrainment ability and mixing ability of the impellers. The results show that the square center impeller (impeller B) improves the flow structure of the molten iron, and makes the volume fraction distribution of the particles much better than that of the traditional impeller (impeller A), the mixing time is the shortest among the three impellers under the same operating parameters. The blades with downward angle (impeller C and impeller D) improve the mixing effect of the region below the impeller, and the impeller C is more sensitive to the change of rotation speed.

Electric Arc Furnace Stirring: A Review

“…Dong et al [44] suggested a maximum spout height of 5 cm to control the previous problems. Li et al [74] studied the limits on gas flow rate to prevent electrode washing for a given arc length using a 1:7 geometric scale EAF model. They obtained the following relationship for the spout height (Δh) as a function of stirring energy (ε) and height of the liquid (H)…”

The effect of impeller size on mixing efficiency in KR method

“…When the type of desulfurizer and the condition of molten iron are stable, the degree of mixing and dispersion of desulfurizer in molten iron directly affects the desulfurization efficiency [2,3] . For KR desulfurization, the purpose of stirring is to eliminate the concentration difference, so the desulfurization efficiency can be expressed by studying the stirring efficiency of the paddle [4] . In order to obtain blades with higher mixing efficiency, the mixing time of three blades was studied in this paper.…”

Water modelling on particle dispersion during KR desulphurization process

“…Many researchers optimized the flow field using physical simulation experiments [10][11][12] and numerical simulations [13][14][15][16] to improve the dispersion of particles. The effect of the impeller rotation speed [4,[17][18][19], impeller rotation direction [20], impeller immersion depth [16], and impeller geometry [21] on the desulphurization efficiency was performed.…”