转杯离心粒化熔融高炉渣数值模拟

在转杯离心粒化熔融高炉渣的过程中,熔渣在转杯施加的离心力的作用下沿转杯内壁形成液态渣膜,其在转杯边缘处的厚度将直接影响渣液离开转杯后破碎和冷却所形成的固体渣粒的粒度。因此,为了探究相关参数对转杯边缘炉渣液膜厚度的影响规律和渣膜厚度与渣粒平均直径之间的定量关系,采用带自由表面多相流的CFD数值模型对液态高炉渣在高速旋转的转杯上的流动行为进行了模拟研究,特别是对影响转杯边缘渣膜厚度的关键参数的作用进行了分析。结果表明,转杯转速和熔渣流量对渣膜厚度的影响最为显著,是转杯离心粒化技术的重要操作参数;渣粒直径则随着渣膜厚度增大而接近线性规律增大。

Numerical modeling of centrifugal granulation of molten blast furnace slag using spinning cups

In the process of centrifugal granulation of molten blast furnace slag based on spinning cups,under the centrifugal force exerted by the spinning cup,the molten slag deforms into a liquid film on the inner wall surfaces of the cup. The thickness of the slag film at the edge of the spinning cup will directly dominate the size of the granulated solid slag particles formed from the breakup and cooling of the liquid slag after leaving the spinning cup. Therefore,in order to explore influences of relevant parameters on the slag film thickness at the edge of the spinning cup and the quantitative relationship between the slag film thickness and the average diameter of the slag particles,a CFD numerical model for multiphase flow with free surface was used to simulate the flow behavior of the liquid blast furnace slag on spinning cups,and,especially, the roles of key parameters affecting the slag film thickness were analyzed. The results show that cup spinning speed and slag flowrate have the most significant influences, which are the important operating parameters of the centrifugal granulation technology, and the mean diameter of slag particles increases nearly linearly with the increase of the film thickness.