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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...
Numerical simulation was carried out on the High Temperature Air Combustion of coal gas in an industrial furnace with a multi-jet burner. A Beta-function PDF (Probability Density Function) combustion model was selected to simulate the gas combustion combined with the standard k-ε turbulent model. The radiation was simulated by a Discrete Ordinates method. Thermal NOx model was used to calculate NO...
In this paper, FLUENT software was used to simulate the burning process in a utility boiler. Chose the kinetics/diffusion-limited as combustion model, discrete ordinates as radiation model, realizable model as viscous model, PDF model as combustion turbulent flow model, and two step mode as soot mode. Numerical calculation of soot was done. The soot distribution along with furnace height and in the...
Pressure excursion after fame out is an important but a less reported issue in large-scale tangentially fired boilers, since they endanger largely boilers operation. Simulations are conducted in this paper to study the issue. Perfect agreement between the simulation results and key boiler design values and available site operation records indicates that the calculations are reliable. Based on the...
There are currently numerous studies on utility boilers using various in-house and commercial CFD codes. Most of the existing simulations are aimed at the flow and combustion properties inside the furnace and therefore, it usually terminates at furnace exit just downstream the re-heater section before the crossover path. On top of that, the majority of these works were based on coal-fired boiler furnace,...
A new-type burner is presented which used transverse airflow to control the air-jet angle from the burner instead of traditionally used swing burner which used mechanical components to control the installation angle of the burner. Jamming problems of traditional swing burners can be avoided. The structure and working principle of the airflow-controlled swing burners are also introduced. Numerical...
A CFD (computational fluid dynamics) software Fluent is applied to numerical simulation for gaspsilas thermal and flow fields in consecutive diffusing furnace. The results of simulation meet producing requirement. The data of temperature field and velocity field of numerical simulation is used to access to development package Open Inventor developed by VR (virtual reality) system. The visualization...
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