| Abstract |
A computational method will be developed to simulate the combined combustion of biomass and coal in biomass co-fired power plants. The model is based on an Eulerian-Lagrangian approach in which gas and particle phases are distinguished. The gas phase is described by the compressible Navier-Stokes equations. Each particle is modeled as a point particle, but a set of equations governing the char front and temperature distribution inside the particle account for the developing internal structure of the particle. Realistic operation conditions of power plants involve particle volume fractions (typically 3x10-4) that require incorporation of two-way interaction between particles and surrounding gas in terms of mass, momentum and energy, and particle-particle interaction by radiative heat transfer. The method enables optimization of the combustion time, ash quality and emissions of the power plant by varying the particle composition and size. Effects of increased biomass fraction on the process efficiency will be quantified. |
