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Continuous miner spray considerations for optimizing scrubber performance in exhaust ventilation systems.

Authors
Organiscak-J; Beck-T
Source
Min Eng 2010 Oct; 62(10):41-46
NIOSHTIC No.
20037808
Abstract
A majority of continuous mining machines employ a water spray system and a machine-mounted flooded-bed scrubber to suppress and capture dust during coal mining. These machine-mounted dust control systems must be designed to function within the localized face ventilation system at the mining section to control both dust and methane. Spray systems can impede or improve the scrubber effectiveness in controlling dust or methane at the mining face. Laboratory experiments were conducted to examine the effect of spray type, spray pressure, machine body blocking sprays and scrubber airflow on dust and gas levels, while using a 12.2-m (40-ft) exhaust ventilation curtain setback from the face. These experiments were conducted with the mining machine positioned at the end of a simulated 6.1-m (20-ft) sump and slab cut. Results indicate that the hollow cone nozzles with blocking sprays best complement the flooded-bed scrubber performance in an exhaust ventilation system. This external spray system notably reduced dust and gas levels on the off-curtain side of the mining machine for both the sump and slab cut compared to the flat spray nozzles. Higher scrubber airflows reduced dust and gas levels on the curtain side and in the return of the continuous mining machine. The remote operator position, located on the off-curtain side and parallel to the inlet end of the exhaust curtain, sustained the most stable and lowest dust levels around the mining machine.
Keywords
Mining-industry; Underground-mining; Coal-mining; Engineering-controls; Dust-control; Dust-control-equipment; Dusts; Dust-particles; Respirable-dust; Methane-control; Mining-equipment
CODEN
MIENAB
CAS No.
74-82-8
Publication Date
20101001
Document Type
Journal Article
Fiscal Year
2011
NTIS Accession No.
NTIS Price
Issue of Publication
10
ISSN
0026-5187
NIOSH Division
OMSHR
Source Name
Mining Engineering
State
PA
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