应用于臭氧消毒系统的新型静态混合器结构设计

Structural design of new static mixer for ozone disinfection system

臭氧水消毒过程中,液液混合均匀性是关键。为提高臭氧水消毒过程的混合均匀性,优化设计了一种旋流扩散静态混合器。通过数值模拟得到旋流扩散静态混合器中臭氧水浓度及压力分布,以旋流扩散静态混合器前后的不均匀系数及压损系数作为评价指标,探究混合元件间距、夹角等因素对臭氧水混合均匀性及压力损失的影响,从而优化混合器结构设计,并与传统SK型混合器进行比较。模拟结果表明:最优结构布局参数为相邻蘑菇头间距40 mm,交错角0°,十字交叉板夹角120°。在此情况下,不均匀系数由1.92降至0.074,压力损失系数为4.96%。新型混合器相比传统混合器具有更好的混合效果,且十字交叉板夹角大小对不均匀系数、压力损失的影响较大。

The liquid-liquid mixing uniformity is an important parameter in the process of ozone water disinfection, a swirl diffusion static mixer was optimized to improve it. The concentration and the pressure distribution of ozone water in the mixer were determined by means of numerical simulation. Using the nonuniformity and pressure loss coefficients before and after the mixer as evaluation indices, the effects of distance,angle and other factors of mixing elements on the uniformity and pressure loss of ozone water were studied,accordingly, the mixer structure was optimized which was compared with the traditional SK mixer. The simulation showed the optimal structural parameters were following: the distance between adjacent mushroom heads was 40 mm, the intersection angle was 0° and the angle between the cross plate was 120°. Under this condition, the non-uniformity coefficient decreased from 1.92 to 0.074, and the pressure loss coefficient was4.96%. Compared with the traditional mixer, the new mixer had a better mixing performance. In addition, the angle between the cross plates had large influence on the coefficient of non-uniformity and pressure loss.