炼钢冷态相似模拟理论及应用

论述了冷态相似模拟理论基础，并针对钢包精炼、溅渣护炉等的冷态模拟试验，给出了具体模拟方法。对于错误的模拟试验给予指正，如钢包精炼炉底吹搅拌的模拟准则的确定，溅渣护炉中由于渣粘度的变化，模拟试验时应给予一定修正。     

钢包粘渣的机理研究

通过对粘渣物、钢包渣、工艺因素、保温剂和钢包残样等的分析,指出钢包粘渣是冶炼钢种、钢包热状态和包衬耐火材料共同作用的结果.高Al2O3的渣冷凝后析出高熔点物质、小修后钢包热状态差以及渣钢渗入耐材是粘渣的主要原因.     

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。     

印度BSP钢包精炼炉滤波器特性及配置选择

根据多年来实际工程对钢包精炼炉谐波特性的分析,其产生的谐波电流除整数次谐波较大外,同时含有0.1~30 Hz的低频分量(次谐波)和非基波(50 Hz)频率整数倍的谐波分量(间谐波),仅配置一般的单调谐滤波器不能起到很好的滤波作用,反而会造成某些谐波放大。设置一个C型阻尼滤波器支路,可以拓宽频带,增加阻尼和减少电阻基波功率损耗,实际应用效果明显。     

80 t钢包静置过程温降分析

针对唐山某公司钢包循环过程中温降过大,温度补偿计算困难的问题,分别采用解析法和数值模拟的方法建立了钢包静置过程的温度预测模型.最终提出的钢包温度计算方法能够较为方便准确的描述钢包温降过程,并以此为基础对钢包内钢液温度进行补偿,此外,推断出烤包温度低是造成钢液温降大的主要原因,钢液静置的前10 min是温降最大的阶段,静置时间超过50 min之后,钢液温度基本保持稳定.     

鱼雷罐局部修补实践

概述鱼雷罐工作层内衬维修的方法,举例介绍拆除旧砖用新砖镶嵌的局部修补实践及其效果。     

降低LF精炼工序成本生产实践

分析了鞍钢1700ASP线LF精炼工序成本的构成,指出降低精炼工序成本关键在于降低渣料消耗和电能、电极消耗.通过优化渣料配比和用量,采用降低钢水传搁时间、减少了周转罐投入数量、制定合理的加热制度和加强操作等措施,缩短了加热时间,渣料消耗降低了3 kg/t钢,电能消耗减低了3.01 kWh/t钢,电极消耗降低了0.04 kg/t钢,LF精炼工序成本降低了3.82元/t钢.     

钢包滑动水口液压系统中忽视的问题及典型故障分析

分析了炼钢厂的钢包滑动水口液压系统中忽视的问题,以及在实际使用中出现的典型故障,提出了解决问题的方法。     

An improved lance design for hot metal de-sulphurisation

Hot metal de-sulphurisation is a dip-lance process involving the pneumatic injection of fine-grained de-sulphurisation reagents into the molten metal. For maximum efficiency the particles must be dispersed in the ladle as widely as possible to increase the total interfacial area which is primarily controlled by the lance design. Seven different lance configurations were modelled and simulated to determine the most efficient design using physical and mathematical modelling approach. A 0.25 scale plexi-glass model of the 100?T hot metal ladle was fabricated for the study. Residence time and mixing time studies were carried out using the electrical conductivity measurement technique through stimulus response of injected saturated salt solution. Mathematical modelling approach using momentum balance was used to simulate fluid flow profile of lance-ladle assembly under operating conditions using computational fluid dynamics package ANSYS-CFX. Based on the studies a new curved port lance has been designed which resulted in uniform and swirling flow profile inside the ladle without rotating the lance. Injection through the new lance increased the residence time of the particles and reduced the dead zones. The new design was fabricated and experimented at de-sulphurisation stations and has resulted in reduced flux consumption and treatment time.     

Two-phase sink vortex suction mechanism and penetration dynamic characteristics in ladle teeming process

At the late stage of continuous casting (CC) ladle teeming,sink vortex can suck the liquid slag into tundish,and cause negative influences on the cleanliness of molten steel.To address this issue,a two-phase fluid mechanical modeling method for ladle teeming was proposed.Firstly,a dynamic model for vortex suction process was built,and the profiles of vortex flow field were acquired.Then,based on the level set method (LSM),a two-phase 3D interface coupling model for slag entrapment was built.Finally,in combination with high-order essentially non-oscillatory (ENO) and total variation diminishing (TVD) methods,a LSM-based numerical solution method was proposed to obtain the 3D coupling evolution regularities in vortex suction process.Numerical results show that the vortex with higher kinetic energy can form an expanded sandglass-shape region with larger slag fraction and lower rotating velocity;there is a pressure oscillation phenomenon at the vortex penetration state,which is caused by the energy shock of two-phase vortex penetration coupling.