CFD based modeling on chemical looping combustion in a packed bed reactor

Numerical Analyses of Heterogeneous CLC Reaction and Transport Processes in Large Oxygen Carrier Particles

“…Khakpoor et al used a grain model (GM) based on a series of reasonable grain assumptions to determine the kinetic parameters of ilmenite reduction reaction with high accuracy [23]. In our previous work [24], the changing grain size model (CGSM) was integrated into an overset based CFD model of CLC in a random packed bed. The CGSM [25,26] assumes that the active materials of fine and nonporous grains are uniformly distributed in the porous particles, in which the grains grow or shrink in reactions following a shrinking core model (SCM).…”

“…Actually, random packed beds with large particles (leading to a small D/d ratio) can be reasonable configurations for many applications considering their small pressure drop and enhanced radial heat removal [27], which can also be suitable for situations with exothermic reactions, such as CLC. In relatively large porous particles, species diffusion is often a limiting step for the heterogeneous reactions, as has been discussed in the works of Noorman et al [28] and Guo & Zhu [24]. These authors have revealed that internal diffusion in large OC particles significantly affects the overall heterogeneous reaction rate, and good choices of particle properties (such as internal pore size and porosity) and particle structure (e.g., eggshells, Guo & Zhu [24]) could alleviate the limitation of internal diffusion and improve the conversion of the OC.…”

“…In relatively large porous particles, species diffusion is often a limiting step for the heterogeneous reactions, as has been discussed in the works of Noorman et al [28] and Guo & Zhu [24]. These authors have revealed that internal diffusion in large OC particles significantly affects the overall heterogeneous reaction rate, and good choices of particle properties (such as internal pore size and porosity) and particle structure (e.g., eggshells, Guo & Zhu [24]) could alleviate the limitation of internal diffusion and improve the conversion of the OC. Therefore, comprehensive and accurate numerical analyses of the effects of intraparticle diffusion characteristics in large particles on the heterogeneous reactions could effectively help to improve the gas-solid reaction performance and the utilization of the OC.…”

Numerical Simulation Applied to PVD Reactors: An Overview

“…Some software and platforms have support services to assist users in solving problems that arise in projects. PVD coatings mechanical properties prediction ANSYS 12.0 [7] Creation of a three-dimensional model describing flow fields and chemical reactions in Claus reactors COMSOL Multiphysics [24] Tribological performance and wear of coated cutting tools AdvantEdg 7.1 [16] Development of the model to evaluate the thermal performance of a solar tubular reactor ANSYS-CFX 14.0 [25] Computer simulation of internal stresses on the PVD coatings ANSYS [17] CFD analysis of Pd-Ag membrane reactor performance during process COMSOL Multiphysics 5.2.1 [29] Coating fracture surface study ABAQUS [77] Fluid dynamics and reaction assessment of diesel oil hydro treating reactors ANSYS-CFX 14.0 [30] Film thickness effect on mechanical properties of PVD coated tools DEFORM and ANSYS [78] Neutral gas flow simulations in an industrial PVD reactor ANSYS FLUENT 14.0 [31] Defects and material deformation study LS-DYNA [79] Prediction of velocity profiles, pressure profiles, density profiles and process gas distribution across the sputtering chamber ANSYS FLUENT [35] Estimate the thermo-mechanical properties of plasma sprayed composite coatings ANSYS-APDL (Parametric Design Language) [83] Modeling on chemical looping combustion (CLC) reactor with a finite volume based CFD method Not defined [94] After analyzing the literature it is observed that FEM is generally used to study, optimize or solve problems associated with mechanical properties, namely, adhesion, wear, stresses in the coating, the influence of the coating thickness, among others. Regarding CFD, there are studies associated with solving problems in aerodynamics, fluid flow, temperature, mass transport, heat transfer, among others.…”

“…Guo et al [94] studied the transport and reaction in packed bed chemical looping combustion (CLC) reactors. For the development of this work, it was necessary to create a CFD simulation model of discrete particles to simulate the CLC.…”