Research on the Temporal and Spatial Law of Respiratory Dust Concentration in Fully-Mechanized Mine

摘要

At present, the temporal and spatial law of the concentration of respirable dust in fully mechanized mining faces had been generally obtained through numerical simulation and regional actual measurement, which are all qualitative researches. This article would conduct quantitative research on them. First, used CFD software to numerically simulate the spatial law of the total dust concentration of the fully mechanized face. Based on this, designed the three-dimensional space actual measurement point plan of the fully mechanized face; adopted the international standard method- weighing method, according to the working conditions (production and support) The total dust concentration and the particle size distribution of respirable dust were measured on site to establish the spatial law of total dust concentration and the particle size distribution of respirable dust and a three-dimensional mathematical model; combined the two to calculate the spatial law of respirable dust at the fully mechanized face; installed a respirable dust concentration sensor at the appropriate position of the fully mechanized face to monitor the characteristics of the change of respirable dust concentration over time, and explored the real-time and online spatial and temporal laws of respirable dust concentration in fully mechanized face based on the previous spatial laws of respirable dust.