Study on the influence pattern and efficiency enhanced mechanism of acoustic-chemical spray dust reduction

Bo Zhao; Peng Xiao; Shugang Li; Xiaoxiao Liu; Haifei Lin; Dongjie Yan; Zixi Chen; Liping Chen

doi:10.1016/j.scitotenv.2023.165913

Study on the influence pattern and efficiency enhanced mechanism of acoustic-chemical spray dust reduction

Sci Total Environ. 2023 Nov 20:900:165913. doi: 10.1016/j.scitotenv.2023.165913. Epub 2023 Jul 30.

Authors

Bo Zhao¹, Peng Xiao², Shugang Li³, Xiaoxiao Liu³, Haifei Lin³, Dongjie Yan³, Zixi Chen³, Liping Chen³

Affiliations

¹ College of Safety Science and Engineering, Xi'an University of Science & Technology, Xi'an, Shaanxi 710054, China; Key Laboratory of Western Mine Exploitation and Hazard Prevention Ministry of Education, Xi'an University of Science and Technology, Xi'an, Shaanxi 710054, China; Western Engineering Research Center of Mine Gas Intelligent Drainage for Coal industry, Xi'an, Shaanxi 710054, China. Electronic address: zhao0220bo@163.com.
² College of Safety Science and Engineering, Xi'an University of Science & Technology, Xi'an, Shaanxi 710054, China; Key Laboratory of Western Mine Exploitation and Hazard Prevention Ministry of Education, Xi'an University of Science and Technology, Xi'an, Shaanxi 710054, China; Western Engineering Research Center of Mine Gas Intelligent Drainage for Coal industry, Xi'an, Shaanxi 710054, China. Electronic address: xiaopeng@xust.edu.cn.
³ College of Safety Science and Engineering, Xi'an University of Science & Technology, Xi'an, Shaanxi 710054, China; Key Laboratory of Western Mine Exploitation and Hazard Prevention Ministry of Education, Xi'an University of Science and Technology, Xi'an, Shaanxi 710054, China; Western Engineering Research Center of Mine Gas Intelligent Drainage for Coal industry, Xi'an, Shaanxi 710054, China.

PMID: 37527714
DOI: 10.1016/j.scitotenv.2023.165913

Abstract

To study the influence pattern and efficiency enhanced mechanism of acoustic-chemical spray method on dust reduction, a self-developed acoustic excitation test platform, viscosity test, surface tension experiment and sinking experiments were used to investigate the chemical spray properties and the wetting behavior of coal dust excited by acoustic waves. The self-developed acoustic-chemical spray dust reduction simulation platform was used to study the influence of acoustic waves on coal dust reduction effect and its efficiency enhanced mechanism. The results showed that the surface tension and viscosity of the chemical spray solution fluctuated between 0.4 mN/m and 0.4 mPa·s along with the variations in acoustic wave frequency and sound pressure level (SPL), thereby confirming that acoustic waves had on effected on chemical spray solution properties. However, the wetting time of the chemical spray solution on coal dust increased by 33.64 % at an acoustic frequency (f) of 1300 Hz and SPL of 120 dB because of the liquid interface vibrations caused by acoustic waves. With an increasing of acoustic frequency, the dust reduction efficiency demonstrated a parabolic trend and reached its maximum value at f = 1300 Hz. The dust reduction efficiency also increased exponentially along with increasing SPL. Acoustic waves not only increased the collision frequency between particles and droplets by changing the trajectory of dust but also accelerated the wetting and agglomeration effect of chemical spray reagents on coal dust by causing vibrations at the gas-liquid interface, thereby enhancing the dust reduction efficiency. Compared to the dust reduction efficiency of chemical spray technology, the total dust reduction efficiency was increased by 8.53 %, and the respirable dust reduction efficiency was increased by 21.93 %. The effect of acoustic waves on the respirable dust reduction efficiency was more significant than that on total dust.

Keywords: Acoustic agglomeration; Chemical spraying; Coal dust wetting; Efficiency enhanced mechanism.