钢渣粒化喷嘴气体射流数值模拟及冷态试验  

Numerical and Cold Simulation on Gas Jet of Nozzle for Steel Slag Granulation

作　　者：李俊国[1] 曾亚南[1] 韩志杰[2] 龙跃[1] 邢宏伟[1] 张玉柱[1] 

机构地区：[1]河北理工大学冶金与能源学院,河北唐山063009 [2]唐山钢铁股份有限公司,河北唐山063016

出　　处：《钢铁钒钛》2010年第4期86-91,97,共7页Iron Steel Vanadium Titanium

基　　金：973专项资助项目(2008CB617602);国家科技支撑计划资助项目(2008BAE67B02)

摘　　要：液态钢渣粒化是对其显热进行回收的关键,因此需要设计出合理的气体喷嘴结构形式和布置形式,从而有利于渣滴在下落过程中凝固形壳。利用F luent软件对不同结构气淬喷嘴的气体射流流场进行数值模拟,与冷态试验结果相比较,结果表明:laval型组合式喷嘴具有射流集中、扩张程度较低的特点,适于对液态钢渣进行气淬粒化。不同马赫数喷嘴射流在喷嘴出口前融合的距离分别为250、265、300 mm,形成流速较为均匀的气体射流,利于钢渣的稳定飞行;随着马赫数增加,出口气体流速随之增加,出口气体温度逐渐降低,有利于渣粒冷却。Granulation of liquid steel slag is the key process during heat recovery.The structure of gas nozzles and their layout should be designed to ensure solidification of slag drops before they falling to the ground.The flow field of gas jet with different structure was simulatd by Fluent software,and the simulation result was compared with that of cold model test.It was concluded that the combined laval-nozzle could provide concentrated and lower-expansion gas jet,and utilized to granulate liquid steel slag by gas quenching.The gas jet out of the combined laval-nozzle could be syncretized and stabilized at 250,265 and 300 mm,repectively,when the Mach numbers of laval-nozzl were 1.0,1.4 and 1.75.Consequently,the liquid steel slag could be granulated to drop and fly steadily when these combined laval-nozzle was utilized.The gas jet velocity at exit increased with the increase of Mach numbers of nozzle.Moreover,the gas jet temperature at exit declined,which could be beneficial to cooling slag drops.

关 键 词：钢渣 粒化 拉瓦尔型喷嘴 流场 数值模拟 

分 类 号：TF748.2[冶金工程—钢铁冶金] X757[环境科学与工程—环境工程]