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Evaluation of Water-jet-assisted Cutting Capability on Longwall Shearers.

Authors
Taylor-CD; Thimons-ED; Kovscek-PD
Source
MISSING :14 pages
Link
NIOSHTIC No.
10007250
Abstract
The U.S. Bureau of Mines evaluated water-jet-assisted longwall shearers in full-scale laboratory tests and underground. Both test programs showed that use of high-pressure water did little to reduce the shearer motor energy required to maintain a given cutting rate. However, three other major benefits were achieved with the use of water-jet-assisted cutting. At 1,800 psi, respirable dust levels were reduced about 80 pct compared with the dust levels of the conventional water spray system operating at 340 psi. Operating at higher pressures required for water-jet assist also resulted in an increase in the average size of coal cut, which translates into a decrease in product fines. Finally, although no controlled measurements of bit wear as a function of water pressure were made, mine personnel reported that the shearer bits lasted longer when water-jet-assisted cutting was used.
Publication Date
19890101
Document Type
IH; Report of Investigations;
Fiscal Year
1989
Identifying No.
RI 9270
NIOSH Division
PRC;
Source Name
MISSING
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division