Technological innovations of electric arc furnace bottom-blowing in China

Nowadays, in China, the bottom-blowing technique plays an important role in accelerating the molten bath stirring and promoting the metallurgical reactions in electric arc furnace (EAF) steelmaking. The innovations of bottom-blowing technologies in EAF steelmaking were reviewed. The optimized bottom-blowing arrangement in EAF based on the furnace structure and the position of electrodes was introduced, and the fluid flow characteristics of EAF molten bath with bottomblowing were analyzed. Furthermore, bottom-blowing CO2 in EAF can facilitate the carbon-oxygen reaction reaching equilibrium and decrease the content of nitrogen in molten steel due to its special metallurgical properties. Pulsating bottom-blowing in EAF can effectively improve the molten bath stirring through the action of the unsteady bottom blowing gas streams, which could make the fluid flow field more disorderly than the steady bottom-blowing. And submerged O2 injection with CO2 in EAF can noticeably strengthen the EAF molten bath stirring, increase the production efficiency and improve the molten steel quality.

衡钢90t电炉除尘系统设计

介绍了衡钢大管坯项目90t超高功率电炉除尘系统的设计、工艺流程、自动化控制和使用除尘系统值得注意的关键技术包括除尘器过滤布袋滤料的材质、清灰技术和烟气温度.衡钢大管坯项目90t超高功率电炉除尘系统已投运6个多月,加料、冶炼熔化、强吹氧脱碳和出钢过程中,除尘效果良好,系统运行稳定.电炉正常运行的情况下,可不需人工干预,完全实现自动控制,与一炼钢除尘系统相比优势十分明显.实践表明,该系统的投入运行,彻底改善了电炉炼钢对环境造成的污染,提高了生产技术水平,收到了很好的经济效益和社会效益.

底吹电弧炉炼钢技术

从电炉底部吹入气体炼钢是一项新近发展的冶炼技术。本文以底吹气体对熔池的搅拌作用为基础,分析了底吹气体对冶金反应和电能消耗的影响,并介绍了底吹供气元件装置和冶炼工艺参数。实践证明,底吹电炉取得了良好的冶金效果,并具有发展前景.

25 MVA硅铁矿热炉带料开炉工艺的探讨

为解决新开炉电耗大、原料消耗多、炉况恢复周期长、开炉费用偏高等问题,文章从电极温度、电流幅度、加料量比和出铁操作等方面对带料开炉工艺进行了探讨,尤其对于25 MVA硅铁矿热炉进行了分析,实践证明带料开炉工艺与传统开炉方法比较,可降低开炉风险、减少开炉费用,可行性高且效果明显,具有很高的推广价值。

一种矿热炉电气全电量信息采集系统

基于增产降耗为目的,提出一种矿热炉电气全电量信息化采集系统,对矿热炉各项电气参数进行采集,并进行信息化处理,然后形成各项有效数据库,从而可提高生产制造过程中关键环节的自动化操作水平,减少人为因素,提高生产稳定性,为冶炼生产过程控制自动化提供必要的数据支撑,是矿热炉自动化冶炼中重要的技术节能手段和信息化措施。

A review on bath fluid flow stirring technologies in EAF steelmaking

In the contemporary electric arc furnace(EAF)steelmaking industry,increasing contents and temperature homogenization via fluid flow stirring is found to be an effective method of improving production quality and smelting efficiency.It is a trend for different factories with bowl-shaped furnaces to apply the bath fluidity enhancement technology.EAF has plenty of advantages in modern steelmaking industry,and the improvements on the EAF steelmaking process have come up with two major tasks,namely reduction in energy consumption and tap-to-tap time.The latter task requires an essential understanding of every phase in EAF steelmaking process.The flat bath phase with poor bath fluid flow was crucial to the product quality and metallurgical efficiency considering EAF’s bowl-shaped structure.The research of three stirring bath methods,oxygen jets injection,electromagnetic stirring,and bottom blowing,were introduced,and then the detailed parameters of each method with their influences on molten bath fluidity were presented.

中国现代电弧炉炼钢废钢快速熔化技术进展

在钢铁行业结构转型关键时期,提高电弧炉短流程工艺比例是降低钢铁行业温室气体排放、脱碳化的有效措施。为了推动短流程炼钢工艺发展,近年来电弧炼钢在废钢快速熔化方面取得明显进展。在回顾前人对废钢熔化速率研究的基础上,全面概述了废钢熔化机理以及影响因素,并结合近年来国内电弧炉炼钢在装备、工艺以及技术上就废钢快速熔化方面取得的进展,探讨了制约电弧炉废钢快速熔化的限制性环节,为废钢快速熔化在电弧炉炼钢装备、工艺、技术方面未来发展提供可行方向。

高炉冶炼精准开炉工艺技术研究及其应用

主要对高炉精准开炉工艺的应用进行了深入研究。基于炼铁基础理论,集成了标准化、精准化的开炉作业流程、开炉冶炼进程中合理参数选择及控制等共性关键操作技术。应用于昆钢某1 080 m^3高炉的生产实践表明,可实现开炉期各个阶段相关联冶炼参数的协调发展,对开炉期过程内的复杂计算、过程处理及冶炼进程进行系统、有效控制。实现了在开炉头次铁出尽后的2~5个冶炼周期内喷煤、富氧,达到开炉6天利用系数大于3.10 t/(d·m^3)、w([Si])稳定在0.40%~0.65%、燃料比小于550 kg/t的目标,显著缩短冶炼进程、降低开炉成本。