CFD simulation of fuel reactor in chemical looping combustion

Numerical Investigation of Nickel–Copper Oxygen Carriers in Chemical-Looping Combustion Process with Zero Emission of CO and H2

“…In the following sections, the two-fluid model (TFM) is used for the interactions between fuel gas and oxygen carrier particles, while the EMMS drag model is employed for the more precise prediction of bubble behaviors in the FR. Referring to previous simulation studies, ,− two different oxygen carriers were little used in the calculation of the CLC system. The performance of oxygen carriers with different weight ratios of NiO/CuO is simulated in a bubbling fluidized bed reactor in the current work, and the model validation of the current simulation is compared with the experimental measurement by Adanez et al The time evolutionary profile of the concentration of gas species at the outlet of the FR and conversion of a specific oxygen carrier are analyzed in the simulation.…”

Hydrodynamic Characteristics of a Pilot-Scale Dual Fluidized Bed with Continuous Feeding and Discharging of Solids: Experiment and 3D Simulation

“…With the rapid development of computational ability, computational fluid dynamics (CFD) has substituted the empirical numerical model and become a valid and effective tool for characterizing the properties of fluidization. With regard to the two main simulation approaches, for high accuracy consumption of a huge computing resource, the application of the discrete element method (DEM) in large-scale fluidized bed equipment is still challenging, yet more and more successful applications of the Eulerian approach have been reported because of its advantages of flexibility and efficiency; thus, this approach was adopted in this study as well. − Numerous studies have been also carried out to simulate the fluidization of a DFB, similar to the status of the experimental investigation of a DFB with constantly circulating solids; Liu et al conducted a series of numerical studies to explore the impacts of operating parameters on the solids circulation rate for the DFB gasification system. , Lu et al simulated the complete CLC/CLR system by using different drag coefficient models to predict gas–solid flow behaviors and reactive characteristics. , Zhou et al performed full loop simulation to study the gas–solid flow behaviors and interactions among the riser, BFB, and port-seal for the FCC application . Obviously, few computations have been carried out on a DFB with continuous feeding and discharging of solids as well, which hampers the exploration of hydrodynamics modeling for DFB design and scale-up.…”