高炉熔渣喷射粒化方法及模拟试验研究  

Simulation Experimental Study on Granulating Molten Blast Furnace Slag by Nozzle Jetting

作　　者：于明志[1,2] 常浩[1] 胡爱娟[1,2] 范雪晶 徐帮耀 王军刚[1] 

机构地区：[1]山东建筑大学热能工程学院,山东济南250101 [2]可再生能源建筑利用技术教育部重点实验室,山东济南250101

出　　处：《应用基础与工程科学学报》2015年第4期836-841,共6页Journal of Basic Science and Engineering

基　　金：国家自然科学基金项目(51176104)

摘　　要：提出了一种利用文丘里管喷射粒化高炉熔渣的方法,选用与高炉熔渣的凝固特性较为相似的熔融白砂糖进行粒化模拟实验.研究了喷管收缩段的收缩角度、喉部长度以及射流速度对粒化效果的影响.实验结果发现:表面张力和黏度较大的熔融白砂糖被喷射凝固产物主要为颗粒,并伴随少量丝状物,绝大部分颗粒粒径小于5mm,丝状物直径在0.1mm左右.随着射流速度的增大,颗粒更加均匀,粒径也更小,而丝状产物随射流速度增大呈先增多后减少的现象.喷管喉部不宜过长,否则产生的颗粒粒径较大,且丝状产物多.增大收缩角,可减小颗粒粒径和减少丝状物生成量.通过合理选择喷管几何参数和射流速度,可以有效粒化熔融液,同时使得丝状产物生成量较小.砂糖实验表明,可使丝状物产量小于1%,几乎所有颗粒粒径均小于5mm.This paper has proposed a novel method to granulate molten blast furnace slag with a venturi nozzle. Sugar were used to be granulated by simulation jetting experiments,which has similar solidification character with molten slag. The influence on granulation of the nozzle contraction ratio,nozzle throat size and the jet flow velocity had been probed into. Experimental results showed the molten sugar,which had relatively high surface tension and viscosity,had been mostly granulated while few filaments been produced. The diameters of most granulated sugar particles were less than 5mm and those of the filaments were about 0. 1mm. With the jet velocity increased,the granulated particles became smaller and more uniform,and the amount of filaments produced increased firstly and then decreased. Longer throat nozzle produces more filaments and larger particles. Nozzles with larger contraction angle produce smaller particles and less filments production. Molten slag can be effectively granulated while very few filaments produced if venturi nozzle parameters and jet flow velocity were carefully selected. Experiments with sugar showed that filments amount can be controlled less than 1% and nearly all particles diameters less than 5mm.

关 键 词：高炉熔渣 粒化 文丘里管 喷射 

分 类 号：TK124[动力工程及工程热物理—工程热物理]