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Evaluate Fundamental Approaches to Longwall Dust Control Subprogram E--longwall Application of Ventilation Curtains.
NTIS: De 90-015501 :54 pages
There are a number of applications on longwall faces where brattice curtains can improve face ventilation and dust control. This report describes the laboratory development and/or field evaluation of several longwall ventilation curtains, including-- 1. Wing curtains--the headgate cutout provides a source of extreme dust concentrations for shearer operators. A wing curtain in the headgate, which shields the headgate drum from the ventilation airstream as the drum cuts out, can reduce the operator's dust exposures during the cutout by 50 to 60 pct. 2. Gob curtains--a significant amount of ventilating air can be lost to the gob in the headgate area. A gob curtain between the first shield and the chain pillar rib can block much of the leakage and increase the volume of air supplied to the face by about 10 pct. 3. Walkway curtains--curtains in the walkway, perpendicular to the airflow, were evaluated for their potential to reduce the migration of dusty face air into the walkway. Unfortunately they proved ineffective. 4. Extended spillplate--a vertical extension to the existing spillplate was evaluated for its potential to partition the clean and contaminated airflow. Unfortunately, only a full-height spillplate (impractical for actual application) showed appreciable reductions in walkway dust levels.
CP; Final Contract Report;
NTIS Accession No.
NTIS: De 90-015501
Page last reviewed: May 5, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division