Modeling of Entrained-flow Coal Gasification by an equilibrium Eulerian-Eulerian two-phase flow formulation

A mathematical model is proposed for the numerical simulation of entrained flow coal gasification,based on an eulerian-eulerian description of the two-phase flow. in contrast to the commonly employed eulerian-lagrangian procedures,which treat the gas phase by a eulerian and the particulate phase by a lagrangian frame of reference,the presently investigated approach applies a eulerian description to both phases. in our implementation,the model is simplified assuming a mechanical and thermal equilibrium between the phases. this leads to a formulation,where the particulate phase appears,merely,as a species of a mixture,for which a single set of momentum and energy equations needs to be solved. for validation,the model is applied to a case,where experimental data and eulerian-lagrangian results of other authors exist. comparisons with the experiments and the eulerian-lagrangian prediction of other authors show that the present eulerian-eulerian approach provides a comparable accuracy to the eulerian-lagrangian modelling and can similarly predict the trends under varying operating conditions. since the proposed eulerian-eulerian formulation is additionally numerically more robust and exhibit better convergence properties compared to the conventional eulerian-lagrangian formulation,it can be considered as an interesting alternative in the numerical simulation of entrained flow coal gasifiers.