Wu Feng, Bai Jinhao, Zhang Jiejie, Zhou Wenjing, Ma Xiaoxun
School of Chemical Engineering, Northwest University, Xi'an 710069, China.
Chemical Engineering Research Center of the Ministry of Education for Advance Use Technology of Shaanbei Energy, Xi'an 710069, China.
ACS Omega. 2019 May 7;4(5):8214-8221. doi: 10.1021/acsomega.9b00856. eCollection 2019 May 31.
The radial mixing characteristics of gas and solid phases in a cylindrical spouted bed with a pair of longitudinal vortex generators (LVGs) are numerically studied by a two-fluid model. The influence of the distance between the centers of two spheres () and the shape of LVGs on hydrodynamics in a spouted bed are discussed. The results show that the value of the coefficient of variation (CV) of the particle concentration can be significantly reduced by the longitudinal vortex produced in spouted beds. The particle concentration near the spout decreases first and then increases with the increase of . When the shape of LVGs is cylindrical, a maximum increase of 188 % for particle volume fraction is found near the spout region of the spouted bed. The strengthening effect on particles' velocity achieves the best in annulus of the spouted bed, and CV of the particle concentration in the spouted bed reaches its minimum value with a pair of cylindrical LVGs.
采用双流体模型对带有一对纵向涡流发生器（LVG）的圆柱形喷动床内气固两相的径向混合特性进行了数值研究。讨论了两个球体中心之间的距离（）以及LVG的形状对喷动床内流体动力学的影响。结果表明，喷动床中产生的纵向涡流可显著降低颗粒浓度的变异系数（CV）值。随着的增加，喷口附近的颗粒浓度先减小后增大。当LVG的形状为圆柱形时，在喷动床的喷口区域附近发现颗粒体积分数最大增加了188%。对颗粒速度的强化作用在喷动床的环形区域达到最佳，并且在有一对圆柱形LVG的情况下，喷动床内颗粒浓度的CV达到最小值。
