A Study on the Role of Reaction Modeling in Multi-phase CFD-based Simulations of Chemical Looping Combustion

Abstract

Résumé -Impact du modèle de réaction sur les simulations CFD de la combustion en boucle chimique -La combustion en boucle chimique (Chemical Looping Combustion) est une technologie de combustion efficace permettant le captage in situ du CO 2 pour des charges gazeuses ou solides. Dans l'optique du développement et de l'extrapolation du procédé, la CFD est un outil de simulation à fort potentiel qui s'appuie notamment sur des modèles cinétiques pour décrire les réactions gaz-solide. Ces modèles décrivant les réactions sont généralement assez simples pour limiter les temps de simulation et sont obtenus à partir d'expérimentations en thermobalance. Il y a encore peu de travaux de modélisation CFD du procédé CLC et il est difficile d'estimer l'importance du modèle décrivant les réactions chimiques sur les résultats des simulations. Abstract -A Study on the Role of Reaction Modeling in Multi-phase CFD-based Simulations of Chemical Looping Combustion -Chemical Looping Combustion is an energy efficient combustion technology for the inherent separation of carbon dioxide for both gaseous and solid fuels. For scale up and further development of this process multi-phase CFD-based simulations have a strong potential

Computational fluid dynamics simulation for chemical looping combustion of coal in a dual circulation fluidized bed

“…Similar simulations were conducted by Jung and Gamwo [20] for the reaction between NiO and methane, Wang et al [21] for the reaction between NiO and methane, and Wang et al [22] for the reduction reaction between CuO/Al 2 O 3 oxygen carrier and coal gas containing CO, H 2 , H 2 O and CO 2 . Kruggel-Emden et al [23] investigated the validity of the heterogeneous reaction kinetics models by conducting a CFD simulation in the FR; the results revealed that the empirical polynomial based models proposed by Kruggel-Emden et al [24] provide an accurate representation to the reaction rate.…”

Numerical Investigation of Solid-Fueled Chemical Looping Combustion Process Utilizing Char for Carbon Capture

“…Nam et al [41] performed a CFD simulation to predict the effects of different jet/grid air ratio and pressure conditions on the hydrodynamics characteristics of a pilot-scale pressurized fluidized bed gasifier. By far, the simulation studies with CFD method on CLC mainly focus on the gas-fueled CLC [42][43][44][45][46][47][48][49][50][51][52] and fluid dynamics in CLC systems [53][54][55][56], and only a few of them have probed into the field of solid-fuel CLC. Mahalatkar et al [57] pioneered the prediction of solid-fuel CLC performance in the fuel reactor using a two-dimensional model.…”

Modelling and simulation of hydrodynamics in double loop circulating fluidizedbed reactor for chemical looping combustion process

“…Moreover low fuel gas conversions were predicted due to the bubbles formed and the reacting gas bypassing the solid inside the bubbling bed. Kruggel-Emden et al [9], Mahalatkar et al [10] also conducted studies of the reactive performance of the CLC system. The simulation studies mentioned above were limited to the fuel reactor only, but a few authors have also carried out the full loop simulation of the CLC process.…”