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UBC Theses and Dissertations

Modeling of steady state heat release, oxygen profile and temperature profile in circulating fluidized bed combustors Ju, Dale Wen-Ching

Abstract

A computer model, using the Monte Carlo method, was developed to predict heat release, oxygen profiles and temperature profiles in Circulating Fluidized Bed (CFB) combustors. The model includes initial devolatilization of the coal feed, a correction in the evolved volatiles region based on the plume model, char combustion, an oxygen mass balance to determine the oxygen profile, and an energy balance to detenriine the temperature profile. The highly non-linear energy balance equation includes conduction, particle and gas convection and radiative heat transfer terms. A number of studies were conducted to observe how the model's prediction changes with superficial gas velocities of 6 m/s and 7 m/s, and solids recirculation rates of 15, 30 and 50 kg/m²s, for both the UBC CFB and the Studsvik CFB. A validation of the model's partial pressure of oxygen profile predictions compared to experimental data was made for the UBC CFB test case.

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