【摘要】 用水力学模型试验研究了搅拌法脱硫过程中,脱硫剂在铁水中的混合现象。用特制的聚苯乙烯发泡粒子模拟脱硫剂,用水-甘油溶液模拟铁水。根据激光经粒子散射后光强随通过的粒子数而变化的关系,利用氦-氖激光器,光电接收器,电子自动电位差计系统,自动记录光强,以测定粒子混合浓度。在动力学相似和几何相似条件下,改变熔池直径D_o、装入深度H_o、搅拌杆直径d、偏心距a、插入深度h、转速N等参数,求得了相对混合浓度差（C_o-C）/C_o与修正的弗鲁德准数F_r′之间的关系式: （C₀-C）/C₀×100=exp{4.6-840[（F_r）′（2a+d）²/D₀H₀]²} 试验结果表明,1/6≥d/D₀≥1/12时,加大搅拌杆直径d,对粒子相对混合浓度C/C₀的影响不大;而h/H₀=1/5～1/3时,C/C₀值最大,若搅拌杆插入深度超过上述范围时,C/C₀值反而减小;偏心距的最佳比值为2a/D₀=1/3～1/2;熔池的最佳装入深度H₀/D₀=1/2～4/5;修正的弗鲁德准数超过一定值时,则飞溅严重。这些试验结果与热模试验结果基本相符,并可为放大设计提供参考。更多还原

【Abstract】 The mixing phenomenon of powdered desulfurizing agents in liquid iron with a rod stirrer was invest-igated by means of hydrodynamic modelling with a special bubbling-polymerized styrene particles, andan aqueous solution of glycerine. Particle concentration was measured automatically with a heliumneonlaser. The relationship between the relative differntial concentration of the particles, （C₀-C）/C₀, andthe modified Froud Number, F′_r, was established by varying the vessel diameter, D₀, depth ofcharge, H₀, rod diameter, d, its eccentricity, a, and immersion depth, h, and the rotational speed, N,of stirring, as follows: C₀-C/C₀ ×100=exp{4.6-840[F′r （2a+d）²/D₀H₀]}Experimental results indicated thatincreasing the rod diameter did not affect the relative mixing concentration, in the range 1/6≥d/D₀≥1/12. But C/C₀ reached a maximum when h/H₀=1/5-1/3. If the depth of immersion exceeded theabove value, however, C/C₀ decreased. The optimal eccentricity of the rod stirrer was 2α/D₀=1/3-1/2,and the optimal depth of charge was H₀/D₀=1/2～4/5. When the modified Froud Number is increasedover a certain value, splashing increases seriously. The above conclusions are in good agreement withhot model experiments and may be proposed for scale-up.更多还原