Transient LES based CFD modeling of coal-biomass co-firing combustion

摘要

Transient simulation using Large-Eddy Simulation of multiphase coal/biomass gasification has been conducted to evaluate the design of an entrained flow reactor to produce syngas. This work considers fast and slow fuel devolatilization, volatile and oxygen transport, chemical reaction and heat release, soot formation, diffuse radiation in the combustion zone and radiation to surrounding objects. Reaction rates and radiation parameters are based upon a local equivalence ratio calibrated against experimental data. This work evaluates reactor design for various co-firing conditions with model verification performed by comparing predictions to measured values of an experiment published by the Advanced Combustion Engineering Research Center. Results confirm the importance of small particles in flame stabilization and overall combustion efficiency.