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Large-scale studies of spontaneous combustion of coal.

Authors
Smith-AC; Miron-Y; Lazzara-CP
Source
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9346, 1991 Jan; :1-30
Link
NIOSHTIC No.
10008556
Abstract
The U.S. Bureau of Mines constructed a large-scale facility to study the self-heating of a large coal mass under conditions that simulate a gob area of a mine. The insulated coal chamber can hold up to 13 short tons of coal and is provided with a forced ventilation system and computer-controlled temperature and gas measurement systems to monitor the heat and mass transfer phenomena that occur in the coalbed. Three experiments were completed with high-volatile c bituminous coals that exhibited high spontaneous combustion potentials in laboratory-scale tests. In the first two tests, sustained heating was not achieved. In the third test, temperatures throughout the coalbed increased steadily from the start, with thermal runaway occurring near the center of the coalbed after 23 days. The thermal reaction zone then moved toward the front of the coalbed. The results of these tests showed that the self-heating of a large coal mass depends not just on the reactivity of the coal, but also on the particle size of the coal, the freshness of the coal surfaces, the heat-of-wetting effect, and the availability of o2 at optimum ventilation rates.
Keywords
Bituminous-coal; Temperature-dependence; Heat-transfer; Mass-transfer; Test-chambers; Gas-analysis; Ventilation; Experimental-design; Data-acquisition; Concentration-composition; Coal-seams; Mine-fires; Coal; Spontaneous-combustion
Publication Date
19910101
Document Type
IH; Report of Investigations
Fiscal Year
1991
NTIS Accession No.
PB92-178078
NTIS Price
A03
Identifying No.
RI-9346
NIOSH Division
PRC
Source Name
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9346
State
PA
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