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CO and CO2 emissions from spontaneous heating of coal under different ventilation rates.

Authors
Yuan-L; Smith-AC
Source
Int J Coal Geol 2011 Oct; 88(1):24-30
NIOSHTIC No.
20039785
Abstract
Carbon monoxide (CO) and carbon dioxide (CO2) emissions during a spontaneous heating event in a coal mine are important gases to monitor for detecting the spontaneous heating at an early stage. However, in underground coal mines, the CO and CO2 concentrations and their related fire ratios may be affected by mine ventilation. In this study, CO and CO2 emissions from spontaneous heating of a U.S. coal sample were evaluated in an isothermal oven under different airflow ventilation rates ranging from 100 to 500 cm3/min. Laboratory experiments were conducted at oven temperatures of 70, 90, and 100 C. The temperature at the center of the coal sample was continually monitored, while the CO, CO2, and oxygen (O2) concentrations of the exit gas were continually measured. The results indicate that CO was generated immediately after the airflow passed through the coal, while CO2 was generated in a late phase. The amounts of CO generated under different airflow rates were approximately the same at the initial temperature of 70 C, while the amounts of CO generated increased significantly as the airflow rates and initial temperatures increased. The ratio of CO/CO2 was found to be independent of airflow rate and initial temperature, approaching a constant value of 0.2 quickly if there was no thermal runaway. The value tended to decrease when a thermal runaway took place. The CO/O2 deficiency ratio was dependent on both airflow rates and the initial temperature. The experimental results are in qualitative agreement with some large-scale test and field monitoring results.
Keywords
Air-flow; Coal-gas; Coal-mining; Control-methods; Control-systems; Engineering-controls; Gas-detectors; Gases; Geology; Laboratory-testing; Measurement-equipment; Mining-industry; Quantitative-analysis; Risk-analysis; Safety-measures; Statistical-analysis; Temperature-effects; Temperature-measurement; Ventilation; Ventilation-equipment; Ventilation-systems; Workplace-studies; Author Keywords: Spontaneous heating of coal; Gas emissions; Ventilation; Detection
Contact
Liming Yuan, NIOSH, Office of Mine Safety and Health Research, P.O. Box 18070, 626 Cochrans Mill Road, Pittsburgh, PA, 15236, USA
CODEN
IJCGDE
CAS No.
630-08-0; 124-38-9
Publication Date
20111001
Document Type
Journal Article
Email Address
Lcy6@cdc.gov
Fiscal Year
2012
NTIS Accession No.
NTIS Price
Identifying No.
B10262011
Issue of Publication
1
ISSN
0166-5162
NIOSH Division
OMSHR
Priority Area
Mining
Source Name
International Journal of Coal Geology
State
PA
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