Numerical Simulation For Co-firing Pulverized Coal With Biomass

The co-firing of coal and biomass has been advocated for a number of years by its environmental and economic advantage alike. In many cases, due to the content of the biomass, co-combustion of coal and biomass will lead to a reduction of pollution gas emissions, such as CO2,NO2.The combustion model mixed with biomass and pulverized coal is a complex problem that involves fuels of dissimilar types or different reactivity. Reaction is modeled by two-mixture fractions/PDF approach in non-premixed combustion model. One mixture fraction is used for the fuel (char), and the second for volatile(secondary). Discrete phase modeling is used for the prediction of particle trajectories.This study presented Computational Fluid Dynamic (CFD) analysis of the effect of co-firing coal blended with biomass, which is saw dust here. This complex problem which is because of its turbulent on the chemical reactions has been simulated in this paper for the purpose to decline the large amount of cost of doing experiment. The CFD analysis includes the prediction of vectors of the gas phase and DPM burnout result alike. What’s more, the reduction of CO2by coal blended with different proportions of biomass has been presented because of low content of char in biomass. The mathematical models consist of models for turbulence flow(RNG K-EPSILON MODEL);non-premixed model with two mixture fractions/PDF model; and radiation (P-1radiation model). The coal is from An Qin in China, and then respectively blended with5%、10%and15%saw dust for co-combustion.