Ventilated Drum Controls Longwall Dust and Methane.
Divers EF; Jankowski RA; Kelly JS
Proc 3rd Mine Ventilation Symp 1987 :85-89
This paper presents results for the first underground test of a ventilated drum in a U.S. coal mine. The tests were conducted to evaluate dust control effectiveness in a western mine and for gas control in a full-scale laboratory facility. The ventilated drum is designed to reduce the amount of dust from cutting by drawing dust- laden air from the cutting zone through 12 water-powered dust capture tubes built into the shell of the shearer drum. High pressure water up to 112.48 Kg/cm2 (1,600 psig) released from sprays induces maximum airflow of 1.89 M3/sec (4,000 ft3/min) from the face side of the drum and provides cleaning for respirable dust and improved methane dispersion. At the gob side of the drum, a deflector plate attached to the cowl arm turns the spray and a proportion of the cleaned air back into the cutting zone. More than 50 ventilated drums have been installed to date in England, and tests carried out on fixed-height and single-ended ranging drum shearers have shown reductions in respirable dust of 60 to 80 pct as compared with conventional wet cutting. The U.S. test on a double drum shearer showed slightly lower reductions.
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