RH精炼底吹工艺优化的物理模拟

Physical simulation of RH refining bottom blowing process optimization

为了提高RH精炼效率,缩短精炼时间。以某钢厂150tRH真空精炼装置为原型,建立相似比为1∶4的水模型,研究底吹孔个数与底吹流量的影响。结果表明,实施底吹工艺后,RH循环流量和混匀时间相较无底吹时都有明显改善。相同底吹流量情况下,单孔底吹对循环流量提升效果明显优于双孔底吹工况,如当底吹流量为90L/min时,单孔底吹工况相较于无底吹工况循环流量增加34%,而双孔底吹工况只增加13%。底吹流量小于90L/min时,单孔底吹和双孔底吹工况下混匀时间相差不大。底吹流量大于90L/min时,双孔底吹工况下混匀时间反而有所增加。建议生产现场采用单孔底吹工艺,如采用双孔底吹工艺时,底吹流量应小于90L/min。

To improve RH refining efficiency and shorten refining time,a 1∶4 water model was established based on a 150 tRH vacuum refining device in a steel plant to study the influence of the number of bottom blowing holes and the bottom flow.The results showed that the RH circulating flow rate and mixing time were obviously improved compared with those without bottom blowing.In the case of the same bottom blowing flow,the effect of the singlehole bottom blowing on circulation flow was obviously better than that of the double-hole bottom blowing.For example,when the bottom blowing flow rate was 90 L/min,the circulation flow rate of single-hole bottom blowing was 34%higher than that of no-bottom blowing,while that of double-hole bottom blowing was only 13%.When the bottom blowing rate was less than 90 L/min,there was little difference in mixing time between single-hole bottom blowing and double-hole bottom blowing.When the bottom blowing flow rate was greater than 90 L/min,the mixing time was increased in the double-hole bottom blowing condition.It was suggested that single-hole bottom blowing process should be adopted at the production field.If the double-hole bottom blowing process was used,the bottom blowing flow rate should not exceed 90 L/min.