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Investigation of dust control by ventilation using a scale model.
Stein-RL; Breslin-JA; Strazisar-AJ
Am Ind Hyg Assoc J 1974 Dec; 35(12):815-824
A scale model of a low coal mine entry with a line brattice exhaust system was used to investigate the effect of distance from the end of the brattice to the mine face, quantity of air delivered to the face, presence of machinery in the entry, speed of the augers, and use of a secondary air exhaust system on dust removal in the vicinity of the face. The model was one-tenth of the protypical 3 by 26 feet entry with a line brattice exhaust ventilation system, and contained a continuous mining machine, a bridge conveyor, and two roof bolting machines. An exhaust fan connected to the model provided the main ventilation with a nominal air velocity in the entry of 60 feet per minute. Secondary airflow provided by ventilation in the mining machine ranged from 500 to 2,000 cubic feet per minute (cfm), and was measured with a hot wire anemometer. Methane tracer gas was introduced near the augers to simulate dust produced by augers. Reproducibility depended on methane concentration and ranged from about 25 to 75 percent. Moving the brattice to within 10 feet of the face was more effective in reducing dust concentration than was increasing the quantity of main ventilation air. Dust concentrations were reduced 50 percent by reducing auger speed from 85 to 65 rotations per minute. The secondary ventilation system reduced dust levels by 90 percent at jacksetter locations. The authors conclude that the effect of ventilation parameters on dust concentrations in a real entry can be studied most effectively in a model entry.
Mining-industry; Coal-miners; Coal-mining; Methanes; Dust-sampling; Dust-exposure; Dust-analysis; Respirable-dust; Particulate-dust; Ventilation; Ventilation-systems; Coal-dust; Control-technology; Dust-control
Issue of Publication
American Industrial Hygiene Association Journal
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division