Modelling of submerged gas injecting lance design parameters

Submerged gas injecting bottom lance design parameters are modelled by applying the theory of compressible flow of gas under irreversible-adiabatic conditions. Using the criterion of onsetting the jetting mode of injection of gas into liquid the lance design paramters such as upstream stagnation pressure and Mach number, length of the lance for a given diameter and material, gas injection rate etc. are determined. Nomograms are presented to determine the above mentioned lance design parameters. The derived parameters are discussed in relation to submerged gas injection practice.     

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.     

氧枪喷头优化设计与应用

采用水模实验对氧枪喷头的使用性能进行模拟分析,对氧枪喷头参数进行了优化设计。与原氧枪相比,新氧枪在冶炼过程中体现了优越的冶炼效果,有效减少了喷溅,增大了冲击面积,化渣良好,同时缩短了吹炼时间,保证了生产的需要。     

南钢150t转炉氧枪喷头的优化与设计

针对实际生产中出现的操作氧压过高,喷溅过大等问题,对南钢原150 t转炉氧枪喷头进行重新设计,利用流体力学FLUENT软件对原喷头和重新设计后的喷头的射流进行了建模和数值模拟。结果表明:重新设计后的喷头在延长使用寿命,改善喷溅,缩短冶炼时间等各种指标上优势明显。     

转炉炼钢用氧枪快换装置和大锥度氧枪的应用

为了实现快速炼钢,降低工人的劳动强度,氧枪快换和大锥度氧枪的应用是炼钢厂发展的必然选择。文章详细介绍了氧枪快换和大锥度氧枪的结构、性能及特点,以及在鞍钢260t转炉实际使用的情况。     

Universal lance for oxygen converters

The action of oxygen-blast pulsations, with complete combustion of the waste gases, on the processes in the steel-smelting bath is described. Scope for reducing the energy consumption in oxygen converters is identified, and special lances for that purpose are designed. It is possible, in principle, to regulate the converter by process by means of a pulsating oxygen blast that has a regular amplitude-frequency characteristic, with complete combustion of the waste gases. This approach may be incorporated in the design of multipurpose oxygen lances.     

氧气底吹熔炼氧枪浅析

系统地论述了氧气底吹熔炼氧枪的结构、工作原理、设计计算方法、材质及蚀损机理,指出了延长氧枪使用寿命的措施。     

转炉氧枪枪位对熔池作用规律研究

为研究吹炼过程中枪位变化对转炉内产生的不同状态,设计吹炼过程水模型实验,并辅助相应计算,发现枪位变化对炉内的液面波动、飞溅高度、冲击直径、冲击深度有一定影响,枪位1.3 m时液面波动和飞溅影响最小。吹炼过程中枪位变化制造了炉内各种波动和高氧化性炉渣,作用于炉衬发生侵蚀。实验发现转炉内波动分2种,一是低枪位区钢渣“朝夕式”运动、二是中高枪位区钢渣“瀑布式”运动。为提高冶金效果,根据实验结论对转炉枪位控制工艺优化,将过程枪位从1.6~1.5 m降低至1.5~1.4 m、终点枪位从1.4 m降低至1.3 m。工艺调整后,吹炼时间比优化前缩短26 s,炉渣中FeO的质量分数降低7.48%,吹炼终点钢液中残锰质量分数提高了0.052%,炉衬侵蚀比优化前明显减轻。      

氧气底吹熔炼氧枪浅析

系统地论述了氧气底吹熔炼氧枪的结构、工作原理、设计计算方法、材质及蚀损机理．指出了延长氧枪使用寿命的措施。     

转炉氧枪系统的自动化控制

在转炉炼钢生产过程中，氧枪系统的控制是非常重要的环节，它直接影响着转炉炼钢生产的安全、高效及钢水质量。本文主要介绍转炉氧枪系统的自动控制过程，叙述了氧枪系统各部分的功能及控制方式。     

氧燃枪喷吹工艺数值模拟研究

为了研究流场分布更为稳定、废钢预热效果更佳的氧燃枪喷吹工艺,本文参考某钢厂实际生产用的预热废钢系统,采用数值模拟法研究了两种喷吹模式(A-B型和A-B-A型)下四种喷吹方式(CO-O2式,O2-CO式,CO-O2-CO式,O2-CO-O2式)的钢包内流场及温度场.研究结果表明,采用A-B-A型O2-CO-O2式喷枪喷吹...     

转炉炼钢氧枪枪位控制

在转炉炼钢中,氧枪枪位直接关系到造渣、脱碳、升温及冶炼过程的平稳进行。采用ＴＳ确定性模糊推理,基于声强与渣高成反比的原理,对氧枪枪位进行连续调节,并采用自学习技术确定每一炉各个阶段氧枪的基本枪位,从而克服了固定枪位吹炼无法及时适应炉况及炼钢原材料化学成分变化的缺点,使氧枪枪位在整个炉役期都能处于最优的位置。