摘要
以某三灯管紫外消毒器为模型反应器,采用计算流体动力学(CFD)模拟技术评估不同穿孔导流板对紫外消毒器水流形态和消毒性能的影响。结果表明,在常规紫外消毒器前端设置穿孔导流板可以改变原水流集中的情况,但在消毒器中间再增加一个穿孔板对进一步均匀化流速分布的作用有限。由于紫外强度在呈三角布置的灯管附近具有最大值,水流的适度分散增大了其与光强分布的匹配度,从而提升了消毒性能。在考察的流量范围内,小穿孔板(孔径为6 mm)对紫外消毒器有效剂量的提升率为20%~34%,高于布水效果更好的基础穿孔板(孔径为10 mm,提升率为3%~13%),表明过于均匀的水流分布在既有的差异化光强分布下反而会减弱消毒效果。水流紫外穿透率的变化不影响各构型紫外消毒器性能的相对优劣,但高穿透率更利于消毒性能的提升。不同穿孔导流板条件下,紫外消毒器的性能主要取决于其最小剂量而非平均剂量。因此,基于CFD模拟技术的紫外消毒器优化设计及运行评估是提升和保障紫外消毒效率的重要途径。
The effect of the perforated plate on the flow pattern and disinfection efficiency of a three-lamp annular UV disinfection reactor was evaluated by using computational fluid dynamics(CFD)modeling.The implementation of a perforated plate in the front of the conventional UV disinfection reactor could obviously change the concentration of the original water flow.However,the addition of a perforated plate in the middle of the sterilizer had limited effect on further homogenizing the velocity distribution.As the UV intensity had the maximum value around the lamps with a triangular arrangement,the appropriate dispersion of the water flow increased the matching degree between the water flow and radiation,thus improving the disinfection performance.In the designed flow range,the effective UV dose of the reactor with a small-pore perforated plate(aperture of 6 mm)increased by 20%-34%,which was 3%-13%higher than that of the basic perforated plate(aperture of 10 mm)with better water distribution,indicating that a too uniform velocity distribution under the existing differential light intensity distribution could reduce the disinfection efficiency.The variation of the water UV transmittance did not affect the comparative performances of different types of UV disinfection reactor.However,a high transmittance was more conducive to the improvement of the disinfection performance.Under different perforated deflector conditions,the performance of the UV disinfection reactor mainly depends on its minimum UV dose rather than the average UV dose.Therefore,the configuration optimization and operation evaluation of the UV disinfection reactor based on CFD simulation technology is an important way to improve and ensure the efficiency of the UV disinfection.
作者
李文涛
詹露梦
李梦凯
何志明
强志民
LI Wen-tao;ZHAN Lu-meng;LI Meng-kai;HE Zhi-ming;QIANG Zhi-min(Key Laboratory of Drinking Water Science and Technology,Research Center for EcoEnvironmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;Sino-Danish College,University of Chinese Academy Sciences,Beijing 101400,China;Foshan Comwin Light&Electricity Co.Ltd.,Foshan 528500,China)
出处
《中国给水排水》
CAS
CSCD
北大核心
2021年第19期40-46,共7页
China Water & Wastewater
基金
国家重点研发计划项目(2018YFE0204103)
国家自然科学基金资助项目(51908536)。
关键词
穿孔导流板
紫外消毒
水流形态
消毒性能
计算流体动力学
perforated plate
UV disinfection
flow pattern
disinfection efficiency
computational fluid dynamics(CFD)
