Experimental study on the atomization characteristics and dust removal efficiency of a fan-shaped nozzle for purifying working environment

Zhuwei Xie; Zhongtai Zhao; Dingfu Li; Fei Li; Chaojun Zhang; Chen Huang; Yimin Xiao

doi:10.1016/j.scitotenv.2023.164994

Experimental study on the atomization characteristics and dust removal efficiency of a fan-shaped nozzle for purifying working environment

Sci Total Environ. 2023 Oct 10:894:164994. doi: 10.1016/j.scitotenv.2023.164994. Epub 2023 Jun 17.

Authors

Zhuwei Xie¹, Zhongtai Zhao², Dingfu Li², Fei Li³, Chaojun Zhang³, Chen Huang⁴, Yimin Xiao⁵

Affiliations

¹ College of Civil Engineering, Chongqing University, Chongqing 400045, China.
² Chongqing Research Institute of China Coal Technology & Engineering Group, Chongqing 400000, China.
³ China Railway 14th Bureau Group Corporation Limited, Jinan 250101, China.
⁴ Chongqing Research Institute of Harbin Institute of Technology, Chongqing 401120, China.
⁵ College of Civil Engineering, Chongqing University, Chongqing 400045, China. Electronic address: xiaoyimin@cqu.edu.cn.

PMID: 37336407
DOI: 10.1016/j.scitotenv.2023.164994

Abstract

The inadequacy of the existing research in characterizing the atomization performance of the whole atomization field by the local region at nozzle axis hinders the improvement of dust removal performance of a spray system, especially for fan-shaped nozzles with large atomization angle. To solve this inadequacy, 88 measuring points were designed in this study to reveal the spatial distribution characteristics of atomization parameters of a fan-shaped pressure atomization nozzle using a 3D Fiber Phase-Doppler Anemometer. Moreover, the atomization performance and dust removal performance of the whole atomization field under different spray pressures were characterized. The results showed that the spatial distribution of atomization parameters in the axis and radial direction of the nozzle was inhomogeneous. As the axial distance from the nozzle outlet increased, the average droplet size showed a trend of first decreasing and then increasing, the proportion of the droplet of 15-70 μm showed a trend of first increasing and then decreasing, while the average droplet velocity and droplet flux showed a decreasing trend. In addition, the spray orientation was perpendicular to gravity, and the atomization field was parallel to gravity, resulting in a significant difference in the average droplet size between the upper region and the axis. Compared with the upper and lower regions, the atomization effect at the axis was superior, manifested by higher average droplet velocity and droplet flux, indicating that characterizing nozzle atomization performance with atomization parameters at the axis will lead to overestimation. The increase of spray pressure can improve atomization performance and dust removal efficiency to a certain extent, but the improvement effect had a limit. The atomization field can be divided into atomization region, expansion region and contraction region, and the expansion region was considered as an effective dust removal region. These findings provide reference for the design and operation of a spray system.

Keywords: Atomization characteristic; Dust removal efficiency; Fan-shaped nozzle; Phase-Doppler Anemometer; Spray dust removal.