TED-AJ03-590 2-D MODELING OF CO-PULVERIZED COAL/BIOMASS COMBUSTION IN FURNACE WITH STATIC MIXERS

概要

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Numerical investigation of co-pulverized coal/biomass particles burning in a furnace with static mixers is presented in this study. Static mixers are placed inside the furnace for efficient turbulent flow mixing. Mixing is accomplished by controlled vortex structures generated by a series of tabs placed inside the furnace. In addition to solving transport equations for the continuous phase (gas), we simulate a discrete second phase (spherical particles) in the Lagrangian frame of reference. Reaction is modeled by a two-mixture fractions/PDF approach. One mixture fraction is used for the fuel (char) and the second for the volatiles. Discrete phase modeling is used for the prediction of particle trajectories. The coal used is a Canadian high sulfur bituminous coal. The coal was blended with 10% and 20% wheat straw (thermal basis) for co-firing. The results showed the presence of four re-circulation zones produced by the four tabs placed inside the furnace. This will help to get efficient mixing of fuel and air and an increase of the combustion efficiency. One important result of using a co-pulverized coal/biomass is the reduction of NO emissions. This reduction depends on the proportion of biomass blended with coal.
社団法人日本機械学会の論文