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Modify spray heads to reduce the dust roll-back on miners.

Authors
Jayaraman-NI; Kissell-FN; Schroeder-WE
Source
Coal Age 1984 Jun; 89(6):56-57
NIOSHTIC No.
10003988
Abstract
The Bureau of Mines recently developed a water spray system that reduces dust levels at the continuous miner operator position, particularly in mines where respirable dust standards are more stringent because of silica in the coal. The purpose is to reduce dust rollback caused by the dense dust at the cutter head spreading back over the operator's cab. This article describes the three factors that promote dust rollback and the features in the new design of the spray system that improve the dust conditions. The design features include (1) a moderate spray pressure of 100 psi at the nozzles, (2) arrangement of top and side sprays for low reach, and (3) use of underboom sprays for increasing the dust knockdown efficiency. The degree of improvement effected by the new system depends on the degree of present exposure of the operator. In recent trials, the new system reduced dust levels by 40 pct.
Keywords
Mining-industry; Underground-mining; Coal-mining; Coal-dust; Silica-dusts; Dust-control; Dust-control-equipment; Respirable-dust
CODEN
COLAA7
Publication Date
19840601
Document Type
OP; Journal Article
Fiscal Year
1984
NTIS Accession No.
NTIS Price
Identifying No.
OP 80-84
Issue of Publication
6
ISSN
0009-9910
NIOSH Division
PRC
Source Name
Coal Age
State
PA
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