摘要
构建专用试验设备,测定了转炉炉体汽雾冷却喷嘴在工作状态下的对流换热系数,得到适用于该型喷嘴在转炉炉体汽雾冷却条件下换热系数的经验公式.综合考虑雾化水射流流场特性、壁面热状态和几何条件等因素,研究了炉体汽雾冷却换热特性及其换热机制.结果表明:雾化水射流的冷却效能取决于能否在热壁表面形成连续的液膜,在工程实际中可通过调整多喷嘴配置来实现炉壳表面连续而基本均匀的液膜,以提高冷却功效;在炉体雾化水射流强化换热过程中,存在最佳射流中心面与热壁间距,在此距离附近的整体传热强化效果最佳;对于现有汽雾冷却系统,当炉壳与托圈内壁间隙为140 mm(即射流中心面与热壁距离为83.5 mm)时,其整体传热强化能力最强.
By the measurement of heat transaction coefficient （HTC） of the convection with the Hi-vap spraying nozzle applied to converter, the empirical formula of heat transaction coefficient was derived based on the test results. The effect with multi-parameters, such as water flux, the temperature of basic oxygen furnace（BOF）, the distance between the BOF＇s shell and the trunnion＇s inner wall, on the characteristics of heat transfer during spraying cooling was discussed. It is found that covering the shell body with liquid film continuously is the key factor affecting the cooling efficiency. To get the perfect heat transfer enhancement effect with the spaying cooling system, the best distance between the BOF＇s shell and the trunnion＇s inner wall is 140 mm, that is, the distance between the nozzle and the heat surface is 83.5 mm.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2009年第5期795-798,共4页
Journal of Shanghai Jiaotong University
关键词
氧气顶吹转炉
汽雾冷却
换热系数
basic oxygen furnace（BOF）
spraying cooling
heat transfer coefficient （HTC）
