以抚钢二炼钢厂30 t VOD生产数据为实践依据,分析了入炉初始钢水温度与VOD精炼过程铬收得率、氧利用率以及耗氧量之间的关系。结果示出,在VOD吹氧冶炼条件下,随着钢水入炉温度的升高,有利于提高铬收得率和氧利用率,降低耗氧量。为得到...以抚钢二炼钢厂30 t VOD生产数据为实践依据,分析了入炉初始钢水温度与VOD精炼过程铬收得率、氧利用率以及耗氧量之间的关系。结果示出,在VOD吹氧冶炼条件下,随着钢水入炉温度的升高,有利于提高铬收得率和氧利用率,降低耗氧量。为得到较好的精炼效果,当不锈钢碳含量的要求分别为≤O.30%C、≤0.03%C和≤0.01%C时,VOD精炼前钢水的温度应分别为≥1600℃、≥1650℃和≥1670℃;为减少喷溅和溢钢事故,钢水初始温度应≥1580℃,为降低耐火材料消耗,钢水温度应≤1720℃。展开更多
The mixing of non-woven steel fibres in melt overflow process for use in automotive muffler systems was simulated. The aim was to identify optimum parameters for achieving a good fibre mix. Numerical models of mixing ...The mixing of non-woven steel fibres in melt overflow process for use in automotive muffler systems was simulated. The aim was to identify optimum parameters for achieving a good fibre mix. Numerical models of mixing chambers of melt overflow process were developed. Multiphysics analyses involving heat transfer, fluid flow and particle tracking were carried out using COMSOL code. The influence of air jet configurations on the fibre distribution was studied. The fibres settled on the moving bed within the mixing chamber were examined for their uniformity. The effect of additional air jets to the existing chamber in a range of regions was explored. An optimum configuration was identified by analyzing the compactness of the particle clusters deposited in the simulation and validated using pixel data acquired from real time imaging. The results showed that by employing dual air jets at the front end of the chamber, the density of the fibre material has improved. We conclude that through multi-physics modelling, it was possible to identify the optimum air-jet configurations leading to fibre uniformity and its distribution. This work also paves the way for incorporating a vision system to evaluate fibre density in real time.展开更多
文摘以抚钢二炼钢厂30 t VOD生产数据为实践依据,分析了入炉初始钢水温度与VOD精炼过程铬收得率、氧利用率以及耗氧量之间的关系。结果示出,在VOD吹氧冶炼条件下,随着钢水入炉温度的升高,有利于提高铬收得率和氧利用率,降低耗氧量。为得到较好的精炼效果,当不锈钢碳含量的要求分别为≤O.30%C、≤0.03%C和≤0.01%C时,VOD精炼前钢水的温度应分别为≥1600℃、≥1650℃和≥1670℃;为减少喷溅和溢钢事故,钢水初始温度应≥1580℃,为降低耐火材料消耗,钢水温度应≤1720℃。
文摘The mixing of non-woven steel fibres in melt overflow process for use in automotive muffler systems was simulated. The aim was to identify optimum parameters for achieving a good fibre mix. Numerical models of mixing chambers of melt overflow process were developed. Multiphysics analyses involving heat transfer, fluid flow and particle tracking were carried out using COMSOL code. The influence of air jet configurations on the fibre distribution was studied. The fibres settled on the moving bed within the mixing chamber were examined for their uniformity. The effect of additional air jets to the existing chamber in a range of regions was explored. An optimum configuration was identified by analyzing the compactness of the particle clusters deposited in the simulation and validated using pixel data acquired from real time imaging. The results showed that by employing dual air jets at the front end of the chamber, the density of the fibre material has improved. We conclude that through multi-physics modelling, it was possible to identify the optimum air-jet configurations leading to fibre uniformity and its distribution. This work also paves the way for incorporating a vision system to evaluate fibre density in real time.
