换向时间对加热炉蓄热室内温度分布的影响  

Effect of switching time on temperature distribution in regenerator of reheating furnace

作　　者：李卫东[1] 马光宇[1] 刘常鹏[1] 赵爱华[1] 孙文强 LI Wei-dong;MA Guang-yu;LIU Chang-peng;ZHAO Ai-hua;SUN Wen-qiang(Technology Center, Ansteel Co. , Ltd. , Anshan 114009, Liaoning, China;School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China)

机构地区：[1]鞍钢股份有限公司技术中心,辽宁鞍山114009 [2]东北大学冶金学院,辽宁沈阳110819

出　　处：《中国冶金》2019年第7期28-31,43,共5页China Metallurgy

基　　金：国家重点研发计划资助项目(2017YFB0304000);国家自然科学基金资助项目(51704069)

摘　　要：采用高温空气燃烧技术的蓄热式加热炉在钢铁企业应用广泛。蓄热室是蓄热式加热炉的重要组成部件,换向时间是加热炉蓄热室的重要操作参数。为了探讨换向时间对蓄热室内温度分布的影响,以鞍钢连轧作业区1号加热炉为原型,搭建了加热炉蓄热室的试验装置。填充了10层蜂窝陶瓷蓄热体,开展了换向时间对蓄热室温度变化规律、沿蓄热室长度方向温度梯度变化规律影响的试验研究,分析了换向时间对蓄热室传热性能的影响。研究表明,蓄热室的温度随换向时间的延长呈现周期性变化。随换向时间延长,蓄热室平均温度呈现出先降低后升高的趋势,沿蓄热室长度方向的平均温度梯度先增大后减小。试验用加热炉的最佳换向时间为70s,对应的热回收率、温度效率和综合传热系数分别为81.6%、91.4%和18.3W/(m^2·℃)。Regenerative reheating furnaces employing high-temperature air combustion technology are widely applied in the iron and steel industry.Regenerator is the key component of a regenerative reheating furnace,with the switching time as its crucial operational parameter.To discuss the effect of the switching time on the temperature distribution in the regenerator,an experimental regenerator apparatus was established with reheating furnace No.1 of Ansteel continuous rolling sector as the prototype.The experimental apparatus was filled with 10 layers of honeycomb ceramic regenerative units.The effects of the switching time on the temperature profile in the regenerator and the temperature gradient along the regenerator were investigated.Results showed a periodic temperature change of the regenerator.With increasing the switching time,the average temperature of the regenerator first decreased and then increased,while the average temperature gradient along the regenerator first increased and then decreased.The best switching time of the experimental furnace was 70 s,with the corresponding thermal recovery efficiency,temperature efficiency and overall heat transfer coefficient were 81.6%,91.4 and 18.3 W/(m^2·℃),respectively.

关 键 词：高温空气燃烧 加热炉 蓄热室 换向时间 温度分布 

分 类 号：TF31[冶金工程—冶金机械及自动化]