真空炉石墨电极消耗高的原因分析

对真空炉的石墨电极易损耗的原因进行了分析，结果生产实路，提出了降低石墨电极单耗的措施。     

真空炉石墨电极消耗高的原因分析

对真空炉的石墨电极易损耗的原因进行了分析,结合生产实践,提出了降低石墨电极单耗的措施。     

LF炉石墨电极消耗行为分析

炼钢行业中石墨电极消耗量极大,石墨电极的消耗成本在总成本中占比较高,各企业非常重视石墨电极的使用效果和消耗情况.简述LF炉石墨电极的主要损耗形式和消耗机理,并介绍9种控制石墨电极消耗的方法和措施,为石墨电极在生产过程中的使用及优化提供指导.     

浅析电炉石墨电极损耗的原因及控制措施

分析了电炉石墨电极损耗的原因,结果表明,电极的额外损耗量远远超过其实际使用量,其中电极的侧面氧化与电极的折断占很大的比例。本文对改变操作方式降低石墨电极消耗进行了研究。     

石墨电极防氧化法

电弧炉炼钢使用的石墨电极,除随着电弧的发生受到电气及机械损耗外,同时还受到高温、高热气氛的侵蚀,自侧面逐渐被氧化损耗。特别是为提高生产效率与降低电耗,电炉高负荷作业越来越普遍,电极的氧化损耗趋向越来越大,从而增加了电极消耗及冶炼成本。为此,国外曾提出于石墨电极表面浸渍或喷涂防氧化剂的种种方法,使表面形成具     

降低石墨电极氧化消耗的几种方法

普通电弧炉炼钢用的石墨电极,是以石油焦为主要原料加工而成的。石墨电极在电炉炼钢过程中的消耗可以分为两大类,第一类是电极的机械损耗(如折断、表面剥落、残头等),第二类为电极的连续损耗,这主要是指电极表面及端头的氧化及浸蚀。这两项消     

抗氧化石墨电极

电弧炉炼钢使用的石墨电极,除伴随电弧的发生而受到电气及机械损耗外,同时由于电炉作业时的高温、高热气氛,自电极侧面逐渐地被氧化损耗。特别是为提高生产效率与降低电耗,电炉的高负荷作业越来越普遍,电极的氧化损耗有越来越大的倾向,从而增加了电极消耗及冶炼成本。     

电炉炼钢和钢包炉精炼用石墨电极的使用及其消耗

简述石墨电极的生产过程，影响电炉炼钢中的石墨电极消耗的因素可分为电气，机械，氧化，管理四个方面，影响钢包炉精炼中的石墨电极消耗的因素主要有：外加机械力，炉渣和钢液，石墨电极温度，石墨电极表面周围的风速，石墨电极气孔率，单位能耗和处理时间等。我国高功率石墨电极和超高功率电极严重缺乏，而且质量指标低于国外水平。     

炼钢用石墨电极

从选用石墨电极的角度简要介绍了炼钢用石墨电极的生产、市场、质量情况，提出了一些石墨电极的技术数据和降低电极消耗的方向，对工程设计有一定的参考价值。     

石墨电极企业在金融危机下的发展战略

阐述了石墨电极行业的基本情况，分析了石墨电极企业面临的机遇与挑战，并提出了应对措施。     

Influence of non-uniform material properties and water cooling on current density and temperature profiles in arc furnace electrodes

The influence of the simplifying assumption of constant electrical conductivity on the modelling of current density and temperature profiles in arc furnace electrodes is investigated in comparison with calculations taking into account the complete interdependence of electrical and thermal effects. With respect to the accuracy of the calculated values for UHP arc furnace electrodes it is shown that the classical theory for the skin effect using the approximation of constant electrical conductivity is inferior to an exact numerical evaluation, especially concerning the current distribution. A two-dimensional thermal analysis is performed for combination electrodes consisting of a water cooling shank and a graphite wearing part, in order to demonstrate the cooling effect for the reduction of graphite consumption. In the electrodes considered here, the cooled region in the wearing part covers an axial distance in the order of one electrode diameter.     

Determination of the allowable graphite amount of a composite electrode for an electric arc furnace

Distribution of heat loads along the length and perimeter of electrodes in terms of the nominal power of transformer, optical characteristics of surfaces taking part in heat exchange and geometric dimensions of the furnace and electrodes has been obtained on the basis of mathematical simulation of processes of heat transfer in working volume of an electric arc furnace, the screening of radiation by electrodes being taken into account. The results obtained give an opportunity of determining the minimal permissible length of the composite electrode graphite part for furnaces with various nominal power transformers. The minimal permissible length of electrode-consumed graphite part is in the range of 80–100 cm for an 100-t electric arc furnace with the transformer of nominal power equal to 75 or 90 MVA. Decrease of the length of electrode graphite part will lead to damage of cooled metal part due to water burn-out.     

六电极连续式石墨化电炉的数值模拟

为了了解六电极电炉在生产过程中电参数和温度场的变化规律,利用ANSYS软件实现炉内物料热电场的数值模拟。通过对六电极电炉电场和温度场的模拟,得到炉内主要发热区和温度分布规律,验证该电炉的可行性与安全性。结果表明:六电极连续式石墨化电炉的主要发热区域集中在相邻电极之间,炉内最高温度达3 093℃;高温区温度分布较为均匀,其温度均在2 360℃以上,可以保证物料的充分石墨化。炉体内壁和电极温度均在安全范围内,六电极连续式石墨化电炉可以实现安全连续生产。     

Remelting of Iron Shavings with the Synergistic Effect of Minimum Metal Loss

Metallurgist - The well-known technologies of remelting iron shavings lead to significant (30%) losses of metal. An electroslag smelting furnace with graphite electrodes is proposed for remelting...     

Control of vacuum arc furnaces

Control of a vacuum arc furnace by means of a programmed step in the melting process is described. A model of voltage control in a vacuum arc furnace was considered in [1, 2]. However, the control algorithm is associated with considerable static error. The error may be reduced using a programmed step, corresponding to previously calculated motion of the consumable electrode so as to maintain constant melting rate and a specified range of the electrode gap. By this means, blind control of melting in the vacuum arc furnace, without any feedback, is possible for ideal electrodes. In the case of nonideal (real) electrodes, however, such blind control cannot maintain the required melting parameters. Therefore, in that case, voltage feedback must be employed. Matlab software is used for simulation of the process in the case of ideal and nonideal consumable electrodes.     

自焙电极电硅热法生产VCr10产品工艺的探析

以自焙电极替代石墨电极用于精炼电炉来生产VCr10产品，通过实验（合格率为39．08％）进行了分析探讨，并确定其可行性。     

真空碳热还原氧化镁脱硫工艺试验

介绍了一种利用真空碳热还原氧化镁对铁水进行脱硫预处理的新工艺。以生铁、氧化镁、石墨为原料,利用真空电阻炉,探讨了真空碳热还原氧化镁对铁水进行脱硫的可行性。氧化镁与石墨的加入比例为1∶2(摩尔比),并加入二者质量分数3%的催化剂CaF2,三者混匀磨细(0.088 mm),加热至800℃后,升温速度由10℃/min降至5℃/min,升温至1 400℃。结果表明,铁中硫含量由0.032%降至0.009%,脱硫率达72%,证明该工艺可行。     

新真空感应炉的应用

利用二次真空精炼炉RH-TOP和VD／VOD工艺对真空感应炉工艺和设备改进进行了论述。改进后的真空感应炉可以更加高效、灵活的用于高端产品的生产。     

转炉蒸汽保障RH精炼炉连续用汽的分析与对策

新钢炼钢厂RH真空精炼炉利用转炉蒸汽作为真空抽气介质。在投产之初因蒸汽难以保障RH真空精炼炉连续生产的要求,现对此现象进行深入分析,寻找到影响原因主要为蓄热器未充分发挥其蓄热功能,并找出相应对策确保转炉蒸汽保证RH真空精炼炉连续生产的用汽的需求。