循环水养鱼系统中臭氧射流混合设备设计与性能测试

为了利用臭氧对养殖水体进行无害化处理，必须使臭氧有效地溶解于水中，以达到净化水质、循环使用的目的。设计结构简单、混合效率高的臭氧混合溶解设备，是实现有效利用臭氧的关键。利用射流器和混合罐相结合的结构，并应用计算流体动力学（Computation Fluid Dynamics，CFD）的模拟方法，对10组射流器进行尺寸参数优选，确定了射流器的主要尺寸参数为：喷射系数0.7、喷嘴直径23?mm、混合管直径42?mm、混合管长度336?mm；通过对研制设备溶解臭氧的监测试验，获得臭氧溶解的变化曲线，臭氧溶解的质量浓度最高可达到0.15?mg/L。根据臭氧溶解曲线和达到的浓度，对养鱼水体进行消毒杀菌、分解有机物、氧化氨氮、凝聚悬浮物处理是完全可行的，达到了设计高效臭氧混合设备的目的。

Design and performance test of ozone mixing ejector in fish recirculating culture

Ozone is a kind of effective disinfectant. When ozone is used in aquaculture water treatment, it must be dissolved in water. It is important to research ozone mixture equipment and dissolution technology for application of ozone in aquaculture. The present research concerned with the design, size parameters optimum and function measurement of ozone mixture equipment, and in structure design, ejector was used as a mixture parts and gas dissolving cane was used as dissolution component. Design method of Computation Fluid Dynamics (CFD) was utilized in 10 groups of ejector sizes, and the optimized main parameters of ejector were injecting coefficient as 0.7, injecting nozzle diameter as 23 mm, mixing tube diameter as 42 mm and tube length as 336 mm. Meanwhile, the performance of ozone mixture equipment was experimented, and ozone dissolution curve was obtained. Ozone could be dissolved easily and the ozone concentration of water could reach up to 0.15 mg/L. According to the experiment function of mixing, the quantity and concentration of ozone could be chosen in disinfecting water, destroying structure of organic substance, oxidizing ammonia, and condensing suspend substance.