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Full-scale testing of the float dust deposition meter.

Authors
Cortese-RA; Perlee-HE
Source
NIOSH 1998 May; :1-10
NIOSHTIC No.
20000051
Abstract
Coal dust and float coal dust, produced during normal mining operations, in underground coal mines, are carried from the point of origin downstream by the ventilating air, where it deposits on the surfaces of the mine entry. In an explosion, this dust is lifted from the surfaces by the aerodynamic disturbances and, if of sufficient quantity, can continue to propagate the explosion. To prevent the surface coal dust from contributing, it must be inerted, typically by spreading pulverized limestone, i.e., rock dust, over the coal dust surface. To facilitate the dusting operation, the National Institute for Occupational Safety and Health (NIOSH), Pittsburgh Research Laboratory (PRL), developed an automated system that continuously monitors the accumulation of coal dust. This system could activate a rock-dusting machine that disperses rock dust into the ventilation air when dangerous deposits accumulate and deactivate the machine when sufficient inert has been deposited on top of the coal dust. The system consists of a microprocessor-controlled optical float dust deposition meter. This device measures the light intensity reflected from a deposited layer of dust. A standard cap lamp is used as a fixed- position light source. From the reflected light signal, the microprocessor determines the hazard level of the deposited layer and performs the appropriate action.
Keywords
Coal-dust; Mining; Underground; Ventilation; Testing; Monitors; Automated-systems; Accumulations; Light-intensity; Float-dust-deposition-meters
Publication Date
19980501
Document Type
Numbered Publication; Report of Investigations
Fiscal Year
1998
NTIS Accession No.
PB98-152929
NTIS Price
A03
Identifying No.
(NIOSH) 98-139; RI-9643
ISSN
1066-5552
NIOSH Division
PRL
Source Name
National Institute for Occupational Safety and Health
State
PA
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