RH喷吹参数对循环流量和均混时间影响的物理模拟

以某厂300tRH真空精炼装置为研究原型,建立1∶6.5的水力模型对RH喷吹精炼工艺进行物理模拟。研究了喷吹位置、喷吹气量及驱动气体流量对循环流量和均混时间的影响。结果表明:不同喷吹气量、驱动气体流量条件下,获得大循环流量和短均混时间的最优喷吹位置不同。较小的喷吹气量(2.98~3.53m3/h)或者较小的驱动气体流量(0.93~1.02m3/h)时,宜采用低顶枪枪位(153.8mm)喷吹;喷吹气量大于3.91m3/h或者驱动气体流量大于1.12m3/h时,宜采用真空槽底部喷吹角度120°的侧喷嘴喷吹。顶枪与侧喷嘴复合喷吹有利于提高RH喷吹工艺的适应性及循环效率。

Physical simulation of effect of injection parameters on circulation flow rate and mixing time in RH vacuum refining process

The effect of injection position,gas blowing rate as well as lifting gas flow rate on the circulation flow rate and mixing time of the RH vacuum refining process were investigated by a water model with scale of 1 ∶6.5 for 300 t RH vacuum refining equipment.The results show that the optimum injection position to get the biggest circulation flow rate and the smallest mixing time of the RH vacuum refining process is different under different gas blowing rates and lifting gas flow rates.Under the condition of smaller gas blowing rate of 2.98-3.53m3/h or smaller lifting gas flow rate of 0.93-1.02 m3/h,the injection with top lance in lower height (153.8 mm) should be adopted.Otherwise,the injection with the lateral nozzle of 120° in the bottom of RH vacuum chamber should be adopted under the condition of larger gas blowing rate (greater than 3.91 m3/h) or larger lifting gas flow rate (greater than 1.12 m3/h).The combination of top lance blowing and lateral nozzle blowing in the bottom of RH vacuum chamber can be used for improving the suitability of the injection process and refining efficiency.