Affiliations: [a] Electronic and Information Engineering, North China Institute of Science and Technology, Beijing, China | [b] Safety Engineering, North China Institute of Science and Technology, Beijing, China | [c] Mechanical and Electrical Engineering, North China Institute of Science and Technology, Beijing, China
Correspondence:
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Corresponding author: Xiangli Bu, Mechanical and Electrical Engineering, North China Institute of Science and Technology, Beijing, China. E-mail: bxl2008.ok@163.com.
Abstract: This paper proposes a spray control system with variable particle size to address the inaccuracy of droplet size control in the existing spray dedusting system. A PID control algorithm with stable air and water pressure is adopted to ensure droplet size uniformity. An experimental device of the droplet control system is built in the laboratory to verify the algorithm’s effectiveness. Experiments were conducted using PLC as the core controller to verify the influence of different types of nozzles on the droplet size under the same air pressure and water pressure through experiments. The results show: (1) the systems droplet size range is 8–200 μm, which meets the dust removal conditions of respirable dust and is suitable for dust removal. (2) When measured under identical experimental conditions, the droplet size decreases as the nozzle angle increases. It was shown that the spray system combined with various sprinklers can achieve full droplet size coverage and improve the efficiency of dust-fall. It provides a solution for the existing dust removal system to flexibly change the droplet size according to the dust size.
Keywords: Spray dedusting, droplet size control, PID control
