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Longwall Shearer Performance Using Water-Jet-Assisted Cutting.

Authors
Kovscek-PD; Taylor-CD; Handewith-HJ; Thimons-ED
Source
BoM, 1986 :15 pages
Link
NIOSHTIC No.
10005327
Abstract
The Bureau of Mines equipped a longwall shearer with a water-jet- assisted mechanical cutting system to determine the effect of the high-pressure sprays on machine performance, airborne dust levels generated, and size of particles formed. Testing was conducted on a simulated coal block (coalcrete) while cutting at a water pressure of 190 psi and at water-jet-assisted pressures ranging from 1,000 to 6,000 psi. The shearer motor energy used by the shearer while cutting coalcrete was determined for each cutting condition. Results indicate that the motor energy required by the shearer for each ton of material cut did not vary significantly as the water pressure was increased. Results of dust measurements recorded near the cutting drum indicate that at water pressures above 3,000 psi, dust reductions up to 85 pct were achieved compared with cutting with conventional sprays. Analysis of the particle size distribution during cutting showed that increasing the water pressure resulted in increased median particle size. In light of these results, various mechanisms for water-jet-assisted cutting are discussed.
Keywords
Particle-size; Respirable-dust; Mining-equipment; Longwall-mining; Mining-research; Hydraulic-mining; Mineral-industries; Hydraulic-and-pneumatic-equipment;
Publication Date
19860101
Document Type
IH; Report of Investigations
Fiscal Year
1986
NTIS Accession No.
PB87-167417
NTIS Price
A02
Identifying No.
RI 9046
NIOSH Division
PRC;
Source Name
Bureau of Mines, Pittsburgh, Pennsylvania. Pittsburgh Research Center
State
PA;
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