推进轮对底置推进器反应釜性能影响计算与试验研究

Calculation and Experimental Study on Influence of Propelling Wheel Set on Performance of Reaction Kettle with Bottom Thruster

借助计算流体动力学软件,采用标准k-ε模型与N-S方程,对反应釜采用不同底置推进器时的内部流场进行数值模拟计算,得到了反应釜内流场分布,并通过运转试验加以验证。数值模拟计算表明,采用不同推进轮时,反应釜内局部区域均产生涡流,反应釜顶部及拐角区域涡流相对明显,存在物料混合不均或结晶下沉堆积可能。反应釜运转试验结果表明,采用翼型推进轮时,反应釜内部涡流较少,液流流动充分,物料结晶或堆积风险降低。运转试验验证了针对反应釜内部复杂三维流动及水力性能进行预测的模拟分析是可靠的。

By using computational fluid dynamics software with adopting the standard k-εmodel and N-S equation,the internal flow field of the reaction kettle with different bottom thruster was numerically simulated,and the flow field distribution in the reactor was obtained,verified by a running test.Numerical simulation shows that,when different propelling wheels are used,the eddy currents are generated in local areas of the reactor,the eddy current at the top and corner of the reactor is relatively obvious,and there is the possibility of uneven material mixing or crystal sinking and accumulation.The running test results of the reactor show that,when an airfoil propelling wheel is used,the internal vortex of the reactor is less,the liquid flow is sufficient,and the risk of material crystallization or accumulation is reduced.The running test verifies that the simulation analysis for predicting the complex three-dimensional flow and hydraulic performance in the reactor is reliable.