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Preliminary Evaluation of Bit Impact Ignitions of Methane Using a Drum-type Cutting Head.

Authors
Larson-DA; Dellorfano-VW; Wingquist-CF; Roepke-WW
Source
MISSING :23 pages
Link
NIOSHTIC No.
10002797
Abstract
Preliminary laboratory experiments have been conducted by the Bureau of Mines to define the influence of bit geometry on methane ignitions as a step toward establishing safer mining-machine operating parameters. The experimental system was designed to simulate the operation of a continuous mining machine, using a drum- type cutterhead of normal diameter with a narrow cross section, permitting full-diameter drum cutting tests to be run on material representative of sandstone lenses (or inclusions) in coal seams. Two conical bit types were tested at shallow depths of cut with three drum speeds. Bits that rotated in the mounting block during testing did not produce ignitions. The ignition frequency for used bits was three to four times greater than for new bits at the same kerf depth.
Publication Date
19830101
Document Type
IH; Report of Investigations
Fiscal Year
1983
NTIS Accession No.
NTIS Price
Identifying No.
RI 8755
NIOSH Division
TCRC;
Source Name
MISSING
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