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Mining Publication: A Comparison Between Ignition Behaviours of 7 Different UK and World-Traded Coals in Air, and in a Mixture of Oxygen and Carbon Dioxide Gases Representative of Oxy-Combustion Conditions
Keywords: Coal Explosive limits
This page is archived for historical purposes and is no longer being maintained or updated.
Original creation date: September 2009
Authors: M Flower, C Man, J Gibbons, N McGlashan
Conference Paper - September 2009
Download PDF Document (0.23 MB)
NIOSHTIC2 Number: 20036290
Proceedings of the 26th Annual International Pittsburgh Coal Conference, September 20 - 23, 2009, Pittsburgh, Pennsylvania. Pittsburgh, PA: University of Pittsburgh, 2009; :1-8
A 20L ignition test chamber has been used to test suspensions of 7 UK and world traded coals in air and O2/CO2 mixtures typical of oxy-combustion conditions. The coals varied in rank from sub-bituminous to bituminous and were tested in varying concentrations from the ignition limit to 400g/m3. Following each successful test the combustion residue was collected, weighed and analysed within a thermogravimetric analyser, allowing Q factors to be estimated. The ignition limit varied slightly in air, but was mostly around the 200g/m3 level. With the exception of Coal C, which was much harder to ignite, it correlated roughly with coal rank. The ignition limit changed significantly with O2 concentration when in mixed O2/CO2 gases. Only a few high volatile coals ignited in 21% O2/CO2 v/v, and then only with a 2500 J, rather than a 1000J, igniter. An increase in O2/CO2 levels to 30 or 35% gave ignition patterns similar to those carried out in air with a further increase to 40% having little additional effect. In addition the minimum ignition concentration decreased with increase in O2. Heterogeneous combustion or gasification of the coal by CO2 appears to be confirmed by comparing weight loss results for air and O2/CO2 mixtures respectively for an equivalent peak pressure rise.
Image of publication A Comparison Between Ignition Behaviours of 7 Different UK and World-Traded Coals in Air, and in a Mixture of Oxygen and Carbon Dioxide Gases Representative of Oxy-Combustion ConditionsConference Paper - September 2009
Download PDF Document (0.23 MB)
NIOSHTIC2 Number: 20036290
Proceedings of the 26th Annual International Pittsburgh Coal Conference, September 20 - 23, 2009, Pittsburgh, Pennsylvania. Pittsburgh, PA: University of Pittsburgh, 2009; :1-8
See Also
Effect of Coal Type and Oxyfuel Combustion Parameters on Pulverised Fuel Ignition
Gas Sorption and Transport in Coals: A Poroelastic Medium Approach
Measuring the Gas Content of Coal: A Review
Methane and Dust Control by Water Infusion: Pittsburgh Coalbed (Fairview, W. Va.)
Methane Diffusion Parameters for Sized Coal Particles: A Measuring Apparatus and Some Preliminary Results
Methane Emissions from Gassy Coals in Storage Silos
Reducing Hazards in Underground Coal Mines Through the Recognition and Delineation of Coalbed Discontinuities Caused by Ancient Channel Processes
Removing Methane (Degasification) from the Pocahontas No. 4 Coalbed in Southern West Virginia
Reservoir Engineering Considerations for Coal Seam Degasification and Methane Control in Underground Mines
Rock and Minerals Make up Your World: Rock and Mineral 10-Specimen Kit Companion Book
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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