炼钢电弧炉高功率变压器的低功率使用

就炼钢电弧炉提高变压器功率后其供电曲线与节电之间的关系进行了系统分析，提出不同冶炼时期电弧热利用率不同，输入炉内的电功率也应随之进行调整。一座５ｔ炼钢电弧炉，通过改造使变压器扩容后，加之供电曲线选择适当，在其它条件相同下，单位电耗降低了１０４ｋＷ·ｈ／ｔ。     

LF炉的温度行为

总结了宝钢电炉炼钢厂ＬＦ炉之温度行为。通过对大量数据的统计分析，得到了钢包在不同状态下钢水的降温速率与钢水浸泡时间及钢水温度的回归关系，考察了不同通电级数下钢水的升温速率及相应的加热效率，获得了加入渣料、铁合金及喂线时的温降系数，给出基于温度分析的ＬＦ炉合适的工艺过程曲线。这些回归关系及各种特征数据的获得，将有助于掌握此座ＬＦ炉的性能特点，并据此测定出更为合理的ＬＦ炉工艺规程。     

Application of neural computing in basic oxygen steelmaking

The use of computer control in the basic oxygen steelmaking (BOS) process is essential to obtain accurate end-point temperature (EPT) and carbon control in liquid steel. The current computer model employed to execute this task is a procedural model that must be maintained by a person with considerable steelmaking knowledge. The requirement for an improved, maintenance reduced model is becoming increasingly important as expertise in this area is dwindling. The steelmaking process is highly complex and volatile. Artificial neural networks (ANNs) have been used to model this type of non-linear system. This paper describes an investigation into the use of ANNs to predict oxygen and coolant requirements during the end-blow period of the steelmaking process. During the end-blow period, a temperature measurement and sample are taken using a probe. These measurements are then used as inputs to the ANN model in order to predict how much oxygen to blow and how much coolant to add in order to achieve the desired end-point conditions in the steel at the end of the process. The software used to perform most of the modelling was the Clementine Data Mining System. This paper discusses the results from the ANN trials at Port Talbot BOS plant, which is part of the Corus Group.     

Numerical Simulation of Fluid Flow and Mixing in Gas-Stirred Ladles

In this work air injection into a water physical model of an industrial steel ladle was simulated. Calculations were developed based on a multiphase Eulerian fluid flow model involving principles of conservation of mass, momentum, and chemical species for both phases to predict turbulent flow patterns and mixing times for centric and eccentric injections. Effects of gas flow rate, injector position, number of injectors, and geometry of ladle on mixing time were analyzed. Optimum injection conditions are: single injector at 2/3 of radius and high gas flow rates. Quantitative correlation of mixing time as a function of main process variables was obtained.     

Increasing the sustainability of steel production in the electric arc furnace by substituting fossil coal with biochar agglomerates

Biochar fines from a wood gasification plant and from pyrolysis of agricultural residues were investigated as substitutes for fossil coal used in the steel production in the electric arc furnace (EAF). During previous tests biochar fines with high specific surface showed problematic burn-off behaviour. Therefore the agglomeration behaviour of the biochar fines was investigated. Different binary and ternary mixtures of biochar with water and binders were tested in a hydraulic stamp press and evaluated with regard to green strength and fatigue strength of the briquettes after 3 days. One selected mixture was used to produce pillow briquettes in a double roll press. The abrasion behaviour of the produced briquettes was tested and compared to an anthracite reference coal (RC). Melting tests in a pilot EAF showed that the agglomerated biochar reacts similar to the RC. The briquetting leads to reduced reactivity and slower burn-off compared to the biochar fines.     

国内转炉炼钢生产现状及技术应用

根据国内转炉炼钢生产及技术现状,概述了重点钢铁企业转炉钢厂的技术经济指标,较详尽介绍了转炉炼钢新技术的实际应用情况,展望了国内转炉炼钢技术未来发展的重点和方向。     

连铸自动加渣机概述

近年来随着连铸技术的迅速发展,更加重视保护渣的加入效果,采用自动加渣机淘汰落后的手动加渣,已成必然。本文简要述叙了自动加渣机的性能和发展方向,对自动加渣技术的开发具有一定的指导意义。     

新型纳米级微孔隔热材料在炼钢生产中的应用

唐山中厚板材有限公司针对炼钢生产中钢水热量损失过大问题,在转炉、钢包和中间包上,系统采用了新型WDS纳米级微孔隔热材料,提高了耐火衬的蓄热量,在不影响耐火材料使用寿命的情况下,转炉的终点温度提高了7℃,从转炉、钢包到LF炉过程温降速度减小了0.3℃/min,采取降低LF炉出站温度5℃的方式,中间包后期钢水温度仍然能够满足连铸工艺需要,达到了节能降耗的目的,可以产生综合经济效益1480万元/a。     

废钢价格与废钢比对炼钢经济效益的影响

通过冶炼过程中物料和能量平衡计算获得炼钢的主要物料消耗指标,提出了冶炼工序效益的概念及其计算方法。在此基础上,计算了废钢价格和废钢比的变化对转炉和电炉吨钢成本及工序效益的影响,通过比较分析,得到转炉采取高废钢比冶炼来提高工序效益的废钢价格范围及电炉效益优于转炉效益的废钢价格范围,并给出了转炉合理废钢比及电炉合理铁水比的大致范围。     

LF炉冶炼铝镇静钢预防水口结瘤的措施

以LF炉冶炼铝镇静钢为例,阐述水口结瘤机理。介绍在LF精炼炉实施的合理控制底吹氩、造还原性白渣和钙处理等防水口结瘤的措施及其效果。