Experimental Research and Numerical Simulation of Ejector Precipitator in a Fully Mechanized Mining Face
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RESEARCH ARTICLE-MECHANICAL ENGINEERING
Experimental Research and Numerical Simulation of Ejector Precipitator in a Fully Mechanized Mining Face Guodong Zhai1
· Wentao Zhang1 · Yaozong Li2 · Xinghao Lu1 · Wenyuan Hu1
Received: 20 February 2020 / Accepted: 1 September 2020 © The Author(s) 2020
Abstract In order to effectively reduce the coal dust concentration in a fully mechanized mining face, this research used laboratory experiment, numerical simulation, and field test to conduct an in-depth exploration of the ejector precipitator installed at the low-level caving coal hydraulic support. Firstly, through the experimental platform in the laboratory, the dust removal effect of the nozzle with different structural parameters was tested, and the 3D particle dynamic analyzer was adopted to verify its atomization characteristics; then, the structural parameters corresponding to the nozzle in the best test results were obtained. Secondly, by using Fluent, the negative pressure flow field in the ejector barrel was numerically simulated. The results indicated that when the pressure of supply water was 12 MPa, the negative pressure value formed in the flow field was the lowest and the inspiratory velocity was the largest, which was conducive to dust removal. Finally, the tests of liquid–gas ratio and dust removal ratio were carried out in a fully mechanized mining face. The results showed that when the nozzle specification recommended by the experiment and the pressure of supply water recommended by the numerical simulation were used, the removal ratios of the total coal dust and the respirable coal dust were 89.5% and 91.0%, respectively, at the measuring point of the highest coal dust concentration. It indicates that the ejector precipitator has a good application effect in reducing the coal dust concentration in a fully mechanized mining face and improving the work environment of coal mine workers. Keywords Ejector precipitator · Nozzle · Atomization characteristics · Numerical simulation · Field test · Dust removal ratio
1 Introduction At present, workplace pollution has become an important scientific research topic, which is of vital significance to the health of workers. Specifically, coal dust is one of the worst polluted disasters in the process of coal cutting [1–3]. If no dust removal strategy is adopted, the concentration of the coal dust can rise to 8000–10,000 mg/m3 in a fully mechanized mining face, which has caused irreparable harm to the physical and mental health of the coal miner [4–6]. According to the statistics released by the relevant departments, the occupational pneumoconiosis accounts for a very large pro-
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Guodong Zhai [email protected]
1
School of Mechanical Electronic & Information Engineering, China University of Mining and Technology-Beijing, Ding No. 11 Xueyuan Road, Haidian District, Beijing 100083, China
2
Zhengzhou Yutong Bus Co., Ltd., Zhengzhou 450018, China
portion of various occupational diseases, and there are tens of thousands of new cases of occupational pneumoconiosis i
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