Experiments and Computational Modeling of Pulverized Coal Ignition

Technical Report · Thu May 01 04:00:00 EDT 1997

DOI:https://doi.org/10.2172/643525· OSTI ID:643525

Chen, J C

Under typical conditions of pulverized coal combustion, which is characterized by fines particles heated at very high rates, there is currently a lack of certainty regarding the ignition mechanism of bituminous and lower rank coals. It is unclear whether ignition occurs first at the particle oxygen interface (heterogeneous ignition) or if it occurs in the gas phase due to ignition of the devolatilization products (homogeneous ignition). Furthermore, there have been no previous studies aimed at determining the dependence of the ignition mechanism on variations in experimental conditions, such as particle size, oxygen concentration, and heating rate. Finally, there is a need to improve current mathematical models of ignition to realistically and accurately depict the particle-to-particle variations that exist within a coal sample. Such a model is needed to extract useful reaction parameters from ignition studies, and to interpret ignition data in a more meaningful way.

• Research Organization: North Carolina Agricultural and Technical State Univ., Greensboro, NC (United States). Dept. of Mechanical Engineering
• Sponsoring Organization: USDOE Assistant Secretary for Fossil Energy, Washington, DC (United States)
• DOE Contract Number: FG22-96PC96221
• OSTI ID: 643525
• Report Number(s): DOE/PC/96221--T1; ON: DE97053778
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
COAL
COMBUSTION
IGNITION
OXYGEN
PARTICLE SIZE
PROGRESS REPORT
PULVERIZED FUELS
REACTION KINETICS