Abstract
A simple mathematical model of the fluid dynamics of a bubbling fluidized bed is reviewed and demonstrated. The goal of the model is to be one part of a computationally efficient performance model of a fluidized bed combustor. The intended application is dynamic, real time modeling of system performance. A one-dimensional model which is based on two-phase theory and bubble coalescence is employed. The model predicts important bubble parameters including size, velocity, and void distribution. A numerical solution technique is derived which is based upon an iteration for solid mass conservation in the bed. Validation calculations which compare model predictions to available cold reactor data are presented. Quantitative agreement with data is shown to be strongly dependent on the correlation of vertical bubble coalescence dynamics. Overall, a useful simulation methodology is produced.
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