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Large-Scale Studies of Spontaneous Combustion of Coal.

PB92178078

Publication Date	1991
Personal Author	Smith, A. C.; Miron, Y.; Lazzara, C. P.
Page Count	38
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 (st) 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, a 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	Coal Spontaneous combustion Bituminous coal Temperature dependence Heat transfer Mass transfer Test chambers Gas analysis Ventilation Experimental design Data acquisition Concentration(Composition) Coal seams Mine fires Large scale tests
Source Agency	Bureau of Mines
NTIS Subject Category	97K - Fuels 81A - Combustion & Ignition 99A - Analytical Chemistry 48A - Mineral Industries
Corporate Authors	Bureau of Mines, Pittsburgh, PA. Pittsburgh Research Center.
Supplemental Notes	Library of Congress catalog card no. 90-15084.
Document Type	Technical Report
Title Note	Rept. of investigations/1991.
NTIS Issue Number	199215

Large-Scale Studies of Spontaneous Combustion of Coal.

Large-Scale Studies of Spontaneous Combustion of Coal.
PB92178078

Publication Date	1991
Personal Author	Smith, A. C.; Miron, Y.; Lazzara, C. P.
Page Count	38
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 (st) 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, a 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	Coal Spontaneous combustion Bituminous coal Temperature dependence Heat transfer Mass transfer Test chambers Gas analysis Ventilation Experimental design Data acquisition Concentration(Composition) Coal seams Mine fires Large scale tests
Source Agency	Bureau of Mines
NTIS Subject Category	97K - Fuels 81A - Combustion & Ignition 99A - Analytical Chemistry 48A - Mineral Industries
Corporate Authors	Bureau of Mines, Pittsburgh, PA. Pittsburgh Research Center.
Supplemental Notes	Library of Congress catalog card no. 90-15084.
Document Type	Technical Report
Title Note	Rept. of investigations/1991.
NTIS Issue Number	199215