Study on dust distribution features of fully-mechanized heading face under long distance exhausted and short distance forced ventilation

In order to master the dust distributing features of the fully-mechanized heading face under the condition of the long distance exhausted and short distan ce forced ventilation, the measurements were conducted on the dust density measuring points and the dust dispersion measuring points located in the mechanized hea ding faces of the three full seam roadways. The dust distribution features and data were obtained and an analysis study was conducted on the features and data. The r esults showed that the distribution scale of the total dust mass density at the air return side of roadheader driver chamber and 5 meters beyond the roadheader were 32 0 ~ 415 mg/m3, 200~ 292 mg/m3 and 290 ~ 365 mg/m3 individually. The total dust mass density and respirable dust mass density at the roadheader driver chamber an d the inlet of the exhaust type fan would be higher and the total dust mass density and respirable dust mass density at the air return side of the5 meters beyond the roa dheader would be lower. Within the range of the air return side between the roadheader driver chamber and the 5meters beyond the roadheader, the dust particle size d istribution would be asymmetry. The dust with the particle size less than 10 μm would be the main dust and would be taken 68.99% ~ 84.25% of the total dust. At the air return side between the roadheader driver chamber to the 5 meter beyond the roadheader, the 10 μm dust dispersion wou Id be decreased and the dispersion variation of each particle size would be small.