空调喷水室过滤细颗粒物的数值模拟与实验研究

发布时间：2018-07-22 21:06

【摘要】：空调喷水室是一种传统的空气处理装置,论文以空调喷水室为研究对象,在保证达到其基本的空气处理功能,维持室内温湿度参数稳定的前提下,对其喷嘴的布置方式和出口雾化液滴的粒径大小等参数进行优化研究,以提高其对空气中细颗粒物的过滤效率。论文采用的方法为数值模拟与实验相结合的方法。首先,应用CFD软件,对喷水室内的流场进行了数值模拟,得出改变喷嘴排管间距、喷嘴孔径大小、喷嘴管排数和喷嘴射流方向等参数对喷水室内流场的影响,同时模拟了进口风速对细颗粒物及雾化液滴运动轨迹的影响,结合细颗粒物的运动理论模型,得出了利于液滴捕集细颗粒物的变化参数,为后面的实验提供了参考和对比验证的依据。然后,通过实验的方式对不同工况下细颗粒物过滤效率进行了研究,并得到了具体的实验数据,通过分析数据得出了最佳的喷嘴布置方式及雾化液滴的粒径;同时对实验装置前后压降和相应的耗水量进行测量后发现,模型整体压降较小,耗水量也相对较少。最后,对比分析了排管间距、喷嘴孔径大小等参数对细颗粒物过滤效率的影响,并参考数值模拟和实验结果,对喷水室内射流喷嘴的布置方式进行了优化,后经实验验证得出,在进口风速为2.75m/s时,实验装置对粒径为0.3~0.5μm细颗粒物的过滤效率为11%;对粒径为0.5~1.0μm细颗粒物的过滤效率为69%;对粒径为1.0~2.5μm细颗粒物的过滤效率大于95%。
[Abstract]:Air conditioning spray chamber is a kind of traditional air treatment device. This paper takes the air conditioning spray chamber as the research object, under the premise of ensuring its basic air processing function and maintaining the stability of indoor temperature and humidity parameters. In order to improve the filtration efficiency of fine particles in air, the parameters such as the arrangement of nozzle and the size of atomized droplets at the outlet were optimized. The method used in this paper is the combination of numerical simulation and experiment. Firstly, the flow field in the spray chamber is simulated by CFD software, and the influence of the parameters such as nozzle spacing, nozzle aperture, nozzle discharge number and nozzle jet direction on the flow field is obtained. At the same time, the influence of inlet wind speed on the trajectory of fine particles and atomized droplets is simulated. Combined with the motion theory model of fine particles, the variation parameters of fine particles are obtained. It provides a reference for the later experiments and a basis for comparison and verification. Then, the filtration efficiency of fine particles under different working conditions was studied by experimental method, and the specific experimental data were obtained. The optimal nozzle arrangement and the size of atomized droplets were obtained by analyzing the data. At the same time, the pressure drop and the corresponding water consumption before and after the experimental device are measured, it is found that the overall pressure drop of the model is relatively small, and the water consumption is relatively small. Finally, the effects of the parameters such as pipe spacing and nozzle aperture on the filtration efficiency of fine particles are compared and analyzed. With reference to the numerical simulation and experimental results, the arrangement of jet nozzles in the water jet chamber is optimized, and the results are verified by experiments. When the inlet wind speed is 2.75m/s, the filtration efficiency of the experimental device is 11 for fine particles with 0.3U 0.5 渭 m diameter, 69 for 0.5 渭 m fine particles with 0.5 渭 m diameter, and more than 95 for 1.0 渭 m fine particles with 1.0 渭 m diameter.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU834.8

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