Modeling of pulverized coal and biomass co-firing in a 150 kW swirling-stabilized burner and experimental validation

Abstract

A comprehensive CFD modeling study has been undertaken to investigate the co-firing of pulverized coal and biomass in a 150 kWFuel swirl-stabilized burner, which is similar in flow pattern to a typical low-NOxburner. The objective of the present study is to derive a reliable modeling methodology for design and optimization of low NOx burners co-firing pulverized coal and biomass. For this purpose, the effects of meshes, global reaction mechanisms for homogeneous combustion, turbulence models, turbulence-chemistry interactions, properties of the solid fuels, and solid-fuel particle conversion models are finely examined. The modeling results are compared with detailed mapping of molar fractions of main species, obtained from FT-IR and a Horiba gas analyzer. This paper presents mainly the comparison of different global homogenous combustion mechanisms and different solid-fuel particle conversion models, in modeling of pulverized coal and biomass co-combustion.