摘要
针对一种竖式换热反应器中钢渣铸块的气-固换热过程进行了深入的数值模拟研究。基于FLUENT软件采用欧拉-欧拉模型,通过单因素控制法系统分析了不同参数对气-固换热行为的影响。结果表明,烟气进口角度下调和烟气进口高度下移都会导致炉顶流出的烟气量减少,烟气换热时间增加。钢渣入炉温度、炉顶压力、钢渣铸块粒径和烟气流量分别影响炉内温度梯度、烟气分布、颗粒比表面积和烟气量大小,进而影响气-固换热系数等,改变换热效率。由于炉内的烟气流量分布会受到其他参数影响,通过控制炉顶压力使竖式换热反应器内的烟气合理分布,维持烟气的向上流动,在此条件下对竖式换热反应器内的传热行为进行研究,结果表明,烟气入口角度下调和烟气进口高度下移有利于提高换热效率,但影响较为有限。选取烟气流量为250、300和350 m^(3)/h,钢渣铸块的入炉温度为1173.15、1373.15和1573.15 K,钢渣铸块的颗粒粒径为21.5、32.3和41.1 mm进行正交分析,烟气流量为350 m^(3)/h、入炉温度为1573.15 K、粒径为21.5 mm时余热回收效率最高,为70.33%。通过对不同工艺参数的优化,本研究为竖式换热反应器的设计与运行提供了理论依据,进一步推动了钢渣余热回收及其在节能减排中的应用潜力。
The gas-solid heat transfer process of steel slag cast blocks in a vertical heat exchange reactor is studied in-depth through numerical simulation.Based on the FLUENT software and adopting the Euler-Euler model,through the single-factor control method,a systematic analysis is carried out on the influences of different parameters on the gas-solid heat transfer behavior.The results indicate that both the downward adjustment of the flue gas inlet angle and the downward movement of the flue gas inlet height will lead to a reduction in the amount of flue gas flowing out from the furnace top and an increase in the heat transfer time of the flue gas.The temperature of the steel slag when entering the furnace,the pressure at the furnace top,the particle size of the steel slag cast blocks,and the flue gas flow rate respectively affect the temperature gradient inside the furnace,the distribution of the flue gas,the specific surface area of the particles,and the amount of the flue gas,thereby influencing the gas-solid heat transfer coefficient,etc.,and altering the heat transfer efficiency.Since the flue gas flow distribution inside the furnace is affected by other parameters,by controlling the pressure at the furnace top to achieve a reasonable distribution of the flue gas in the vertical heat exchange reactor and maintaining the upward flow of the flue gas,under this condition,the heat transfer behavior in the vertical heat exchange reactor is studied.The results show that the downward adjustment of the flue gas inlet angle and the downward movement of the flue gas inlet height are conducive to improving the heat transfer efficiency,but the impact is relatively limited.Orthogonal analyses are carried out by selecting the flue gas flow rates of 250,300 and 350 m^(3)/h,the temperatures of the steel slag cast blocks when entering the furnace at 1173.15,1373.15 and 1573.15 K,and the particle sizes of the steel slag cast blocks at 21.5,32.3 and 41.1 mm.When the flue gas flow rate is 350 m^(3)/h,the temperature when entering the furnace is 1573.15 K,and the particle size is 21.5 mm,the waste heat recovery efficiency is the highest,reaching 70.33%.Through the optimization of different process parameters,this study provides a theoretical basis for the design and operation of vertical heat exchange reactors,further promoting the application potential of steel slag waste heat recovery and its role in energy conservation and emission reduction.
作者
丁冉
魏汝飞
狄瞻霞
范春龙
张翼飞
孙蓉
龙红明
DING Ran;WEI Rufei;DI Zhanxia;FAN Chunlong;ZHANG Yifei;SUN Rong;LONG Hongming(School of Metallurgical Engineering,Anhui University of Technology,Maanshan 243002,Anhui,China;Anhui Province Key Laboratory of Metallurgy Engineering and Resources Recycling(Anhui University of Technology),Maanshan 243002,Anhui,China)
出处
《钢铁》
北大核心
2025年第4期190-202,共13页
Iron and Steel
基金
国家自然科学基金区域联合重点基金资助项目(U23A20605)
中国宝武低碳冶金创新基金资助项目(BWLCF202202)。
关键词
钢渣
竖式换热反应器
气-固传热
数值模拟
余热回收
计算流体力学
参数优化
节能
steel slag
vertical heat transfer reactor
gas-solid heat transfer
numerical simulation
waste heat recovery
computational fluid dynamics
parameter optimization
energy conservation
