中央扩散型喷嘴颗粒分散调节特性的实验研究

建立了几何尺寸相似比为1:5的中央扩散式精矿喷嘴冷态模型装置，用石英砂模拟精矿粉，用Matlab软件绘制接粒称重冷态实验颗粒分布云图，研究了反应塔内颗粒分布均匀性随分散锥、投料速度、工艺风和分布风变化的规律. 结果表明，塔内颗粒分布均匀性可调控，分散锥和投料速度对颗粒分布均匀性影响小；随工艺风流量Qpro增加或分布风流量Qdis减小，颗粒向塔中心区域聚集，表征颗粒分布均匀性的颗粒质量偏析函数增加. 实验范围内各工况Qdis和Qpro与颗粒质量偏析函数px之间的关系可拟合为px=(-0.00025+0.3176/Qdis)Qpro-1.51，拟合规律与文献和冶炼现场操作参数配置基本吻合.

Experimental Study on the Characteristics of Particles Dispersion and Adjusting for Concentrated Burner

A cold experimental model of concentrated burner with geometric similarity of 1:5 was built, the distribution uniformity of particles with varied dispersed cone, loading rate, process air and distribution air in a flash furnace were studied with the cold experimental methods of substituting sand for concentration, receiving and weighing particles, and the distribution nephograms of particles were drawn up with software Matlab. The results showed that the distribution uniformity of particles in the reaction tower could be adjusted. The dispersed cone and the loading rate had a small effect on the distribution uniformity of particles. The particles were concentrated on the central zone of tower, and the mass segregation function px of particles describing the distribution uniformity of particles inside the tower increased, when the loading rate increased, the flow rate of process air (Qpro) increased, or the flow rate of distribution air (Qdis) decreased. Qdis and Qpro could be expressed with the function of px within the experimental scope by the fitting relation of px=(-0.00025+0.3176/Qdis)Qpro-1.51, which accorded with operating parameters from references and smelting site.