在线实时监测微气泡尺寸系统的构建及效果分析  

Construction and effect analysis of a test system for online real-time monitoring the microbubble size

作　　者：梁倩卿 卜亿峰 门卓武 LIANG Qianqing;BU Yifeng;MEN Zhuowu(National Institute of Clean-and-Low-Carbon Energy,China Energy Investment Corporation,Beijing 102209,China)

机构地区：[1]国家能源集团北京低碳清洁能源研究院,北京102209

出　　处：《环境工程学报》2022年第9期3134-3143,共10页Chinese Journal of Environmental Engineering

基　　金：国家重点研发计划项目(2017YFB0602500)。

摘　　要：为在线监测污水处理、水体增氧和气液相化学反应过程中的气泡粒径的实时变化情况,构建了一种在线测试微气泡群的测试系统,并进行气泡粒径的实时监测;将微细气泡发生装置产生的气泡水引入到粒度分析仪的测试区样品池,形成一个稳定的动态循环流动的系统;通过调节分流阀和分散剂阀同时实现样品的均匀混合和在线取样,再将样品输送至样品池进行快速检测,实现气泡尺寸的在线实时监测。结果表明:当遮光率为10%,从样品槽混合好的样品到样品池的距离为6 cm,测试时间为10 s时,可获得测试微细气泡粒径的最佳条件,精度为±6%;溶气-释气法产生的微细气泡粒径为10~150μm;随着进气量的增加,气泡的尺寸逐渐增加,其对应的体积比逐渐较小;气泡的粒径还会受到液相水样的影响,当液相为循环水时,气泡粒径呈双峰分布;当液相为新鲜自来水时,气泡粒径呈单峰分布。微气泡尺寸在线测试平台具有具有重复性好、精度高、可控性强、操作简单等特点。本研究结果可为微气泡在污水处理、水体增氧和气液相反应等场合的应用提供参考。In order to online monitor the real-time variation of bubble size in sewage treatment,water oxygenation and gas-liquid chemical reaction,a test system for online testing of micro-bubble groups was constructed to realize the real-time monitoring of bubble size.The bubble water produced by the micro-bubble generator was introduced into the sample cell of the particle size analyzer in the test area and a stable dynamic circulating flow system was formed.By adjusting the diverter valve and the dispersant valve,the uniform mixing and online sampling could be realized at the same time.Then the sample was transported to the sample cell for rapid detection which could realize online real-time monitoring of bubble size.The tested results with an accuracy of±6%showed that the optimal conditions for testing the particle size of micro-bubble were following:the shading rate was 10%,and the distance from the mixed sample in the sample tank to the sample cell was 6cm,and the test time was 10 s.The particle size of the micro-bubble produced by the dissolved gas-release method was 10~150μm,which was in good agreement with the literature results.Simultaneously,with the increase of air inlet,the size of the bubble gradually increased,and its corresponding volume ratio gradually decreased.The bubble size was also affected by the liquid water inlet.The bubble size displayed a bimodal distribution with the liquid phase of circulating water,while it displayed a unimodal distribution with the liquid phase of fresh tap water.The microbubble size online test platform presented the characteristics of good repeatability,high precision,strong controllability and simple operation,the results of this study can provide a reference for the application of microbubbles in sewage treatment,water oxygenation and gas-liquid phase reactions.

关 键 词：在线测量 原位监测 微气泡 激光粒度仪 粒径分布 

分 类 号：X830.2[环境科学与工程—环境工程]