Ff. Peng et Wg. Wang, RESPIRABLE DUST CONCENTRATION DISTRIBUTION MODEL ON LONGWALL FACES - MULTIPLE DUST SOURCE APPROACH, Powder technology, 79(2), 1994, pp. 121-133
A mathematical model is developed for description of the dust concentr
ation distribution on the longwall faces of coal mines involving multi
ple dust sources of various particle sizes. Longwall mining is an effi
cient and productive coal-mining method. However, it generates a large
quantity of respirable dust in the working area during the shearing a
nd transportation of coal. Multiple dust sources on the longwall face
make dust distribution prediction very difficult. In this paper, the p
rimary sources of respirable dust and transportation of dust particles
on a longwall face are determined. The dust particle size distributio
ns at various locations of the longwall face are analyzed, classified
and incorporated into the dust distribution model. General trends of d
ust concentration obtained at different working positions on a longwal
l face are discussed. The mathematical model takes into account the ch
aracteristics of airflow, the effect of particle size, various dust so
urces, and the mechanisms of dust transport along a longwall face. It
predicts the dust behaviors and dust distribution in the longwall mini
ng atmosphere under various operating conditions. Computer programs ba
sed on the respirable dust distribution model are also developed. The
predicted results are compared with the field data from several longwa
ll faces.