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Individual biomass particle exchanges mass and heat with its surrounding during the thermal conversion process. Therefore environmental conditions around the particle greatly determine the conversion process through which the particle undergoes. It is important to model this relationship between particle and its surroundings during the thermal conversion rather than using random boundary conditions...
In this paper, the Computational Fluid Dynamics (CFD) has been applied for burner design and development in order to simulate the flow and significant characteristics of producer gas combustion, such as when pollution is released. The producer gas's constituents were taken by GC analysis, whereas the amount of combustion air was determined from 1 mole, assuming a combustion equivalent ratio of 0.9...
Air supply is one of the most important factors that influence the combustion of the volatile and carbon in a biomass fired boiler. For many biomass power generation plants, there is insufficient measure to assure the proper air supply. In this study, computational fluid dynamics (CFD) modeling of a double-grate biomass fired boiler was carried out. The three-dimensional Reynolds averaged Nervier-stokes...
A lab scale cyclonic combustor is in developmental stage for firing coal-biomass blends. The lab scale test rig would be used to support a study of coal-biomass co-combustion in a selected real pulverized coal, tangentially fired power plant. The conceptual design is made similar to the two-stage inverted cyclonic combustor at Cardiff University (A. Abd Rahman and N. Syred), previously used in a completed...
With the computational fluid dynamics software FLUENT the flow field of flue gas from one 75 t/h circulating fluidized bed combustion boiler was simulated. The results showed that when air distribution was not taken into account, the flow of the two flue gases in the bag filter were not uniform. The flow field of coal flue gas was more disordered than that of biomass, but the majority of them moved...
Gasification based biomass co-firing was an attractive technology for utilizing biomass as an additional fuel in utility boilers. Compared to directly co-firing biomass and coal, it showed following benefits: (1) avoiding biomass delivery into the boiler, (2) reduced boiler slagging, (3) avoiding altered ash characteristics. In co-firing demonstration project, higher percentage of biomass gas for...
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