Study on the effect law of virtual impact separator efficiency based on multi-factor orthogonal test

Abstract

In order to effectively solve the problem of low separation efficiency of respiratory dust in coal mine, a multi-factor orthogonal experiment was designed for the virtual impact separation device. A coupled airflow-dust migration model for describing the interior of the separator device was established based on the Euler-Lagrange method, and the 3D structure materializing of the separator was realized by accurate 3D printing technology. The maximum deviation of the separation efficiency between the experimental results and the simulation results is 5.85%. Through range analysis, the importance degree of each factor affecting the separation efficiency is determined as follows: nozzle diameter (20.31) > inlet section diameter (18.02) > distance between nozzle and large particle collecting cavity (14.85) > inlet length (10.66) > large particle collecting cavity diameter (10.04) > strong current sampling flow rate (7.84); The better separation scheme is found and the separation efficiency of dust with particle size of 1 µm∼7 µm is 91.75%, 90.75%, 78.61%, 68.85%, 58.14%, 34.12%, 12.41%, respectively. The research results provide theoretical guidance for the development and application of virtual impact separation technology.