Coal and biomass cofiring

Abstract

Suspension-firing, fluidized bed combustion and grate-firing are the three main technologies used to co-fire coal and biomass for heat and power generation. Computational Fluid Dynamics (CFD) modeling is a powerful and cost-effective tool for problem-shooting, design and optimization and plays a vital role in the development of these co-firing technologies. This chapter focuses on CFD of coal and biomass co-firing. After a brief overview of the status of co-firing, the chapter presents in detail the basic modules in general co-firing CFD. Then, the specific or new modeling strategies and issues that are pertinent to each of co-firing technologies are elaborated. Finally, new modeling issues for coal and biomass co-firing under oxy-fuel conditions are presented, before concluding remarks on coal and biomass co-firing modeling are summarized.

Computational assessment of biomass dust explosions in the 20L sphere

“…In solid fuel combustion CFD, the radiative transfer equation (RTE) is commonly solved by the P1 and discrete ordinates fvDOM models [96]. Although the former is computationally cheaper than latter, fvDOM is preferred in this work because is applicable to all the optical thicknesses resulting from the wide range of dust concentrations considered in this study.…”