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Mining Publication: Factors Affecting Coal Particle Ignition Under Oxyfuel Combustion Atmospheres
Keywords: Coal Ignitions Oxygen
Original creation date: January 2011
Authors: C Man, JR Gibbins, KL Cashdollar
Peer Reviewed Journal Article - January 2011
Download PDF Document (0.51 MB)
NIOSHTIC2 Number: 20038364
Fuel 2011 Jan; 90(1):294-304
A set of 13 coals of different rank has been tested for ignition propensity in a 20-L explosion chamber simulating oxyfuel combustion gas conditions. Their char residues were also analysed thermogravimetrically. The effects of coal type, coal concentration (from 100 to 600 g/m3), O2 in CO2 atmospheres (up to 40% v/v) and particle size were investigated. The higher rank coals were significantly more difficult to ignite and mostly required higher energy chemical igniters (1000 or 2500 J) whereas the lower rank coals could be ignited with a 500 J igniter even at low coal dust concentrations. The minimum explosibility limit/ignition concentration in air varied slightly around a value of 200 g/m3, a little higher for low volatile coals and a little lower for high volatile coals. The ignition limit changed significantly, however, with O2 concentration in CO2, where coals required more oxygen to ignite. Most coals failed to ignite at all in 21% v/v O2 in CO2, but an increase to 30 or 35% v/v O2 gave ignition patterns similar to those in air. In addition, the minimum ignition concentration decreased with increase in O2. However, a further increase to 40% v/v O2 did not generally affect the minimum ignition concentration. Particle size had a non-linear effect on coal ignition. The fine particles (<53 lm="" behaved="" almost="" identical="" to="" the="" whole="" coal="" however="" larger="" size="" fraction="">53 lm) was generally more difficult to ignite and exhibited a much lower weight loss.
Image of publication Factors Affecting Coal Particle Ignition Under Oxyfuel Combustion AtmospheresPeer Reviewed Journal Article - January 2011
Download PDF Document (0.51 MB)
NIOSHTIC2 Number: 20038364
Fuel 2011 Jan; 90(1):294-304
See Also
Effect of Coal Type and Oxyfuel Combustion Parameters on Pulverised Fuel Ignition
Gas Sorption and Transport in Coals: A Poroelastic Medium Approach
Ignition of Methane-Air Mixtures by Laser Heated Small Particles
Methane Diffusion Parameters for Sized Coal Particles: A Measuring Apparatus and Some Preliminary Results
Methane-Air Mixtures Ignited by CW Laser-Heated Targets on Optical Fiber Tips: Comparison of Targets, Optical Fibers, and Ignition Delays
Performance Comparison of Rescue Breathing Apparatus
Reducing Hazards in Underground Coal Mines Through the Recognition and Delineation of Coalbed Discontinuities Caused by Ancient Channel Processes
Reservoir Engineering Considerations for Coal Seam Degasification and Methane Control in Underground Mines
Safe and Economical Inerting of Sealed Mine Areas
Technology News 473 - The Explosion Hazard From Hydrogen Gas Generation Inside Sealed Frames
Page last reviewed: May 18, 2015
Page last updated: May 18, 2015
Content source: National Institute for Occupational Safety and Health, Mining Program
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