Abstract
A mathematical model of a coal flame is applied to simulate and interpret pilot-scale test data on flame stability and combustion efficiency of three coals with volatile contents varying from 19–41% daf. The flame model is based on the equations governing conservation of mass, momentum, species and energy and includes physical models for turbulence, volatiles combustion, radiation heat transfer and particle dispersion together with phenomenological models to describe coal devolatilization and char combustion. Measurements and predictions suggest that the flame stability is primarily determined by the burner aerodynamics with little influence of coal volatile content, while the ignition behaviour is determined by both the coal volatile content and the specific energy of the volatiles. Combustion efficiency is strongly influenced by the coal volatile content. Detailed in-flame measurements of flow, temperature and gas composition are reported and used to evaluate the coal flame model. Discrepancies in the prediction of near-burner-zone properties appear to be attributable to defects in the modelling of turbulent transport and/or volatiles combustion. Modifications to either component of the model are shown to yield improved agreement with the measured data.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
