210 tRH精炼过程的混匀特性

以某钢厂210tRH真空精炼装置为原型,根据相似原理建立1﹕4水模型,研究了吹气量、浸入深度、真空度以及气孔堵塞对混匀时间的影响。结果表明,RH混匀时间随着吹气量的增加而呈现减小的趋势；随着浸入深度的增加先减小后增大,并存在最佳浸入深度480 mm；随真空室压力的减小而减小；随着吹气孔堵塞个数的增加先减小后增加。利用粒子成像测速技术( particle image velocimetry,PIV)测量了RH精炼过程钢包内二维流场,与数值模拟结果对比,发现钢包内的流体运动主要是从下降管到上升管的循环流动以及下降管周围的回流运动,不活跃区主要集中在渣-钢界面以下浸渍管浸入深度范围内。

Mixing characteristics of 210 tRH refining process

To understand the characteristic of mixing in 210t RH vacuum refining process, a 1﹕4 water model was established to investigate the effects of gas flow rate, snorkel immersion depth ( SID) , vacuum chamber pressure and number of blockage blowing air holeon the RH mixing time. The results show that the RH mixing time presents a decreasing trend with the increase of gas blowing andthe decrease of the vacuum chamber pressure. Furthermore, the mixing time first decreases then increases with the increaseof the snorkel immersion depth (SID)and the number of blockage blowing air hole, and the optimum SID is 480mm. Using particle imageve-locimetryto measure the two-dimensional flow field of RH ladle in refining process, andthen compared to the results of numerical simu-lation, the resultsshowthat the fluid movement in the ladle is mainly the circulation flow from down-leg to up-leg andthe back-flow a-round the down-leg. In addition,the inactive region is mainly located in the range of SID under the steel-slag interface.