钢包底吹氩工艺开发-钢铁冶金专业论文.docxVIP

摘 摘 要 对钢包底吹氩精炼过程中钢液的流动和混合特性作了水模型研究。以130吨钢包为原 型，设计、加工和建成了几何相似比为1：4的水力学模拟系统。采用电导法测定了底吹 氩钢包内钢液的混匀时间，考察了一些主要工艺和结构参数对流动、混合和传质的影响； 显示分析了钢包内液体的流动状态和流场；通过水模型实验，讨论了钢包底欧精炼过程中， 单喷嘴喷吹不同喷吹位置、喷吹量对混匀效果的影响；双喷嘴喷吹不同喷吹组合对混匀效 果、卷渣的影响；进行了单喷嘴喷吹与双喷嘴喷吹的对比分析，同时建立数学模型，使用 PHOENICS软件进行计算，分析计算结果，探明影响底吹氩钢包内钢液流动行为的因素，寻 求合理的吹氩工艺参数： 实验结果表明，底吹气搅拌时，混匀时间会随着气流量增大而缩短。但存在一个临界 喷吹量，超过临界喷吹量液面剧烈翻滚，引起卷渣。 对比单喷嘴喷吹与双喷嘴喷吹模式，+在相同的吹气量下，双喷嘴喷吹搅拌效果好，混 匀时间短。同时发现在～定范围内增大两喷嘴间距，有利于缩短混匀时间，减少漩涡卷渣 发生的机率。但喷嘴不宜太靠近包壁，避免发生剪切卷渣。通过实验分析，距中心距离为 0．6R～O．65R为最佳喷吹位置，实际生产中吹氩量不宣超过50 m锄e 关键词：吹气搅拌：水模型：混匀时间：卷渣：数学模型 AbstractUsing Abstract Using water modeling method，The fluid and mixing characteristics under the different operating modes in bottom blowing argon ladle pmccss have been investigated．A water model of 1／4 linear scale for 1 30t ladle has been desired，fabricated and established．The mixing time of molten steel in the ladle has been measured、^，lm conduetivity method．The influence of the main technological and structural parameters was examined．The fluid flow pattem and flow field in the ladle were demonstrated．observed and analyzed．By using water model simulation discuss that the different blowing position of single nozzle and bowing quantity of gas influence the mixing effect，double blowing and different blowing combination impress the mixing effect and the entrapped寸ag．Comparably analyzes single nozzle blowing and double blowing- At the SBYfie time．Numerical simulation has been done，usiug the commercial code PHOENICS to describe to find the fluid flow changes under each situation,the projeet finds out the effect tecbmical parmlaeters of blowing argon，which provides the optimum argon blowing operation duty, It may be conctuded that under the condition of bosom blowing argon,mixing time shorten with increasing blowing quantity of gas，but critical argon blowing quantity exists，beyond which the liquid surface fluctuates fiercely and slag entrapped by molten steel happens． Single nozzle blowing and double blowing were compared under s