Search

A novel method to efficiently clean coal-dust-laden air method was proposed and its related equipment was developed. This method does not use conventional nozzles and filters, and has no requirements on the water quality of coal mine. It has strong adaptability and stable dust suppression efficiency. [Display omitted] During the green mining processes of coal energy, large amounts of coal-dust-laden air may be generated. This has caused serious health threats to mine workers. In this paper, a novel method for efficiently cleaning coal-dust-laden air was proposed. The method involved the use of air scrubbers composed of water inlet pipes, radial mixing impellers, water distribution plates, swirl vanes, and dehydrator. The radial mixing impellers were utilized to break up the water which flowed from the water inlet pipes to water distribution plates. As a result, water mist was formed, which then combined with the coal-dust-laden air, effectively sucking it using the negative pressure from the impeller rotation actions. The coal-dust-laden air and solid-liquid mixtures were moved along a certain trajectory by centrifugal force and gravity, and then discharged to the exterior. Experiments and field application processes were carried out in order to test the effectiveness of the proposed method. The experimental results showed that the dust removal efficiency of the method had reached 97.70 %. In addition, the proposed method was applied to a coal preparation plant in China's Shanxi Province. The test results indicated that the average concentrations of total dust and respirable dust were found to have decreased from 71.11 to 2.89 mg/m3 and from 47.675 to 1.958 mg/m3, which met the requirements of environmental standards. Therefore, since the proposed method had not used conventional nozzles and filters, and had no requirements regarding the water quality of the coal mine, it had displayed strong adaptability and stable dust removal efficiency. The results obtained in this study showed that this new method of cleaning coal-dust-laden air was a promising measure by which to significantly improve the working environments of coal mines. [ABSTRACT FROM AUTHOR]