Fluidized combustion chamber CFD simulation based on Euler-Euler granular flow model

Abstract

A comprehensive 2-D numerical model of the bubbled fluidized bed withcombustion of liquid fuels is proposed in the paper. The proposed numerical model is based on the Eulerian-Eulerian granular flow modeling with the kinetic theory of granular flow. The model includes the following basic governing equations: the continuity equations of the solid and gas phase, the momentum conservation equations of the gas and solid phase, the energy equations of gas, and the solid phase and conservation equations for chemical components. The choice of the semi empirical constants of the inter-phase interaction drag force model is significant and these constants must be adjusted for each particular regime of fluidization. Presented numerical experiments primarily were applied to verification of the assumptions about the impact of water content in a liquid fuel on FB combustion intensity. The presented numerical experiments were carried out with 0,0, 0,1, 0,2, 0,3, and 0,4 mass fractions of water in the diesel fuel. Within the analysis of the results of the numerical simulation of fluidised bed combustion of the fuel with different water contents, the temperature profiles, the kinetic ratio of diesel fuel oxidation and CO concentration profiles were considered.