摘要
氧枪的射流特性直接影响到转炉的吹炼效果。针对某钢厂120 t转炉供氧时间长、氧耗高等问题,对氧枪喷头进行优化设计,利用数值模拟的方法研究氧枪喷头优化前后的射流特性。该研究充分考虑了炼钢环境高温、高CO浓度的特点,创新性地在模拟计算中导入气相燃烧反应机理,首先对比分析了激活燃烧反应机理前后的计算域温度场和速度场差异,结果表明,氧气射流与环境气氛中的CO会发生燃烧反应,燃烧火焰主要集中在多股射流之间的区域,气相燃烧有助于抑制射流速度的衰减和多股射流的聚并。对新旧氧枪喷头的模拟结果表明,新氧枪喷头的射流长度和流股直径都更大,具有更强的冲击搅拌能力。现场采用新氧枪喷头后,供氧时间缩短50 s,氧耗降低1.37 m^(3)/t,过程化渣得到改善,粘枪和溢渣喷溅率下降,冶金指标得到全面提升。
Jet characteristic of oxygen lance directly affects the metallurgical performance of converter.To solve the problems of long blowing time and high oxygen consumption of a 120 t converter,oxygen lance nozzle optimization was carried out,then the jet characteristics was studied based on numerical simulation.In this paper,the features of high temperature and high CO concentration in steelmaking environment were fully considered,and the gas phase combustion mechanism was creatively introduced into the simulation.Firstly,the differences of temperature field and velocity field in the computational domain between the case without considering combustion and the case considering combustion were analyzed.The results show that combustion reaction between oxygen jet and CO will occur,and the combustion flame is mainly concentrated in the region between multiple jets.Gas phase combustion helps to suppress the attenuation of jet velocity and the coalescence of multiple jets.Simulation results of old lance and new lance indicate that the jet length and strand diameter of new oxygen lance are larger and have stronger impact ability.The new oxygen lance was applied at the steel plant,oxygen blowing time was shortened by 50 s,oxygen consumption was reduced by 1.37 m^(3)/t,slagging was improved,lance sticking and slag slopping were decreased.Overall,the metallurgical indexes were improved comprehensively after applying the new lance.
作者
茹作栋
张英嘉
王春江
胡绍岩
王德永
RU Zuodong;ZHANG Yingjia;WANG Chunjiang;HU Shaoyan;WANG Deyong(Hongxing Iron and Steel Co.,Ltd.,Jiuquan Iron and Steel Group,Jiayuguan 735100,China;School of Iron and Steel,Soochow University,Suzhou 215137,China)
出处
《炼钢》
CAS
北大核心
2022年第4期21-27,共7页
Steelmaking
基金
国家自然科学基金资助项目(52104337)
江苏省自然科学基金资助项目(BK20200869)。
关键词
转炉氧枪
氧气射流
气相燃烧
数值模拟
炼钢环境
oxygen lance
oxygen jet
gas combustion
numerical simulation
steelmaking environment
