新型涡流空化器的实验研究

摘要

目前利用空化释放出能量是充分利用能量的一种新方法,为此设计了一种新型的涡流空化器,定量分析了空化引发·OH(羟自由基)产量与空化强度的关系.文中以亚甲基蓝作为羟自由基的捕捉剂,使用紫外-可见分光光度计间接测定了水力空化产生的·OH产量,并利用该方法对涡流空化器空化效果进行了实验研究.分析了旋流腔直径、空化器出液管直径和空化器进液管流速等工艺参数对自由基产量的影响.力求寻出有利于空化发生以及提高空化作用强度的适宜空化器的设计工艺.结果表明:进液管流速越大,出液管直径越小,旋流腔直径越小,·OH摩尔浓度越大.与孔板水力空化器对比,涡流空化器单位压降的·OH的摩尔浓度是孔板水力空化器的13.99～68.19倍,说明涡流空化器能量利用率更高,空化效果更好.%In view of a new method that the cavitation releases energy to make full use of the energy,a new type of vortex cavitation was designed.The quantitative analysis of (· OH) production and the relationship between the cavitation intensity by cavitation was proceeded.The methylene blue as capture agent of hydroxyl radical,the ultraviolet-visible spectrophotometer was used to indirect determination of (· OH) production generated by the hydraulic cavitation,and the experimental study of the vortex cavitation effect was carried on by the method.The influences of the vortex cavity diameter,cavitation produced liquid pipe diameter and cavitation in liquid flow rate etc.process parameters on the free radical production were analyzed.The appropriate design of cavitation process was looked for which benefit for cavitation occurring and cavitation effect adapting.The results show that the liquid pipe flow rate is more rapid,the produced liquid pipe diameter is smaller,and the vortex cavity diameter is smaller,and the concentration of (· OH) is greater.Compared with the orifice hydraulic cavitation device,the · OH molarity of vortex cavitation device is 13.99 ～ 68.19 times of the orifice hydraulic cavitation.It indicates that the vortex cavitation has higher energy utilization efficiency and better cavitation effect.