Fluid dynamic simulation in a chemical looping combustion with two interconnected fluidized beds

This work is a comprehensive review of the Chemical-Looping Combustion (CLC) and Chemical-Looping Reforming (CLR) processes reporting the main advances in these technologies up to 2010. These processes are based on the transfer of the oxygen from air to the fuel by means of a solid oxygen-carrier avoiding direct contact between fuel and air for different final purposes. CLC has arisen during last years as a very promising combustion technology for power plants and industrial applications with inherent CO 2 capture which avoids the energetic penalty present in other competing technologies.CLR uses the chemical looping cycles for H 2 production with additional advantages if CO 2 capture is also considered.The review compiles the main milestones reached during last years in the development of these technologies regarding the use of gaseous or solid fuels, the oxygen-carrier development, the continuous operation experience, and modelling at several scales. Up to 2010, more than 700 different materials based on Ni, Cu, Fe, Mn, Co, as well as other mixed oxides and low cost materials, have been compiled. Especial emphasis has been done in those oxygen-carriers tested under continuous operation in Chemical-Looping 2 prototypes. The total time of operational experience (≈ 3500 h) in different CLC units in the size range 0.3-120 kW th , has allowed to demonstrate the technology and to gain in maturity. To help in the design, optimization, and scale-up of the CLC process, modelling work is also reviewed. Different levels of modelling have been accomplished, including fundamentals of the gas-solid reactions in the oxygen-carriers, modelling of the air-and fuel-reactors, and integration of the CLC systems in the power plant. Considering the great advances reached up to date in a very short period of time, it can be said that CLC and CLR are very promising technologies within the framework of the CO 2 capture options.

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“…air-reactor, cyclone and fuel-reactor, in a small scale cold-flow model has been successfully modelled by using CFD codes [361][362][363].…”

Section: Fluid Dynamicsmentioning

confidence: 99%

“…17 shows the solids distribution in the system predicted by the CFD model in the whole loop [363]. However, limited works have been carried out using CFD codes to simulate a CLC system.…”

Section: Fluid Dynamicsmentioning

confidence: 99%

Progress in Chemical-Looping Combustion and Reforming technologies

Adánez

Abad

Garcı́a-Labiano

et al. 2012

Progress in Energy and Combustion Science

1,997

1,614

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“…In CFD modelling of the CLC process, both gas and solid phases are treated as continuous and interpenetrating phases in the time and phase averaged Navier-Stokes equations. Wang et al and Seo et al investigated, respectively, the hydrodynamic behaviours of the full CLC loop using the simplified two-dimensional cold-flow model [21,22]. CFD modelling of the flow behaviours and reactive characteristics of different oxygen carriers in the fuel reactors was also reported [8,23,24] and the predictions were in reasonable agreement with the experimental results.…”

Section: Introductionmentioning

confidence: 91%

Prediction of formation of gas-phase bubbles correlated by vortices in the fuel reactor of chemical looping combustion

Chen

Yang

et al. 2015

Fuel Processing Technology

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“…This keeps run times down and allows for long-time simulations to give insight into the dynamics of a chemical looping model system, which is of key interest here. An extension of the model considering the interconnecting equipment like pipes, cyclones and siphons as proposed in [23] and towards 3D as proposed in [26] are improvements relevant to further developments, but are not considered in the basic setup here.…”

Section: Interconnected Chemical Looping Modelmentioning

confidence: 99%

“…Extensive comparisons of results from different experimental setups from the literature with multiphase CFD simulations were performed by the same group of authors [22], indicating good agreement and therefore suitability of CFD methods. A nonreacting chemical looping model of a coupled fuel and air rector setup was investigated by Shuai et al [23] who characterized the developing flow structures. A reacting isothermal interconnected system involving methane as gaseous fuel was addressed by Mahalatkar et al [24].…”

Section: Introductionmentioning

confidence: 99%

Heat and Mass Flow Control in an Interconnected Multiphase CFD Model for Chemical Looping Combustion

Kruggel‐Emden

Scherer

2011

Chem Eng & Technol

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Chemical looping combustion is a feasible option for carbon capture from fossil fuels. Within the process, the oxygen necessary for combustion is provided by a solid carrier material which alternately undergoes oxidation and reduction reactions. Features of the process are that the oxidation reaction of the particulate carrier in the air reactor is strongly exothermic and that the conversion of both oxidation and reduction reactions has to be in balance for stable operation. Simulations of the transient behavior of chemical looping combustion systems are possible through multiphase CFD. To allow for the modeling of chemical looping at steady state, cooling of the reactors and mass flow between fuel and air reactor must be adequately adjusted. Therefore, an interconnected multiphase CFD model was extended by an adjustment control. In this extended modeling framework variations of the operational load, control set points and carrier materials were performed. These simulations allow detailed insight into the dynamic behavior of chemical looping systems.

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Fluid dynamic simulation in a chemical looping combustion with two interconnected fluidized beds

Cited by 49 publications

References 43 publications

Progress in Chemical-Looping Combustion and Reforming technologies

Progress in Chemical-Looping Combustion and Reforming technologies

Prediction of formation of gas-phase bubbles correlated by vortices in the fuel reactor of chemical looping combustion

Heat and Mass Flow Control in an Interconnected Multiphase CFD Model for Chemical Looping Combustion

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