Application of CPFD method in the simulation of a circulating fluidized bed with a loop seal Part II—Investigation of solids circulation

Wang, Qinggong; Yang, Hairui; Wang, Pei‐Ning; Lü, Junfu; Liu, Qing; Zhang, Hai; Wei, Lubin; Zhang, Man

doi:10.1016/j.powtec.2013.11.040

Cited by 69 publications

(21 citation statements)

References 20 publications

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“…However, this approach has major limitations in considering variations of particle properties, as example, wide particle size distribution, density diversification and sphericity consideration. Nevertheless, the particle size differences and/or density variations can affect the gas-solids flow behaviors such as solid segregation (Wang et al, 2014a), hence cannot be neglected in certain situations. In that case, many separate continuity and momentum equations are required to accurately represent the different particle types and sizes in this model (Andrews and O'Rourke, 1996).…”

Section: Eulerian-eulerian Approachmentioning

confidence: 99%

CFD Approaches for Modeling Gas-Solids Multiphase Flows - A Review

Ariyaratne

Manjula

Ratnayake

et al. 2018

Linköping Electronic Conference Proceedings

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This review study focuses on the application of Computational Fluid Dynamics (CFD) in the investigation of gas-solids multiphase flow systems. The applicability and limitations of conventional models and recent developments of existing multiphase models for the prediction of gas-solids flows are thoroughly overviewed. Use of conventional Eulerian-Eulerian model for granular flows and Lagrangian approach incorporated with Discrete Element Method (CFD-DEM) are quite well proven, however some limitations restrict the use of these models in wide range of applications. Therefore, some new models have been introduced to model gas-solids flows, as example Dense Discrete Phase Model incorporated with Kinetic Theory of Granular Flow (DDPM-KTGF), Dense Discrete Phase Model incorporated with Discrete Element Method (DDPM-DEM) and Computational Particle Fluid Dynamics (CPFD) numerical scheme incorporated with the MultiPhase-Particle-In-Cell (MP-PIC) method. These models have been validated for certain applications under certain conditions, however, further validation of these models is still a necessity.

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Section: Eulerian-eulerian Approachmentioning

confidence: 99%

CFD Approaches for Modeling Gas-Solids Multiphase Flows - A Review

Ariyaratne

Manjula

Ratnayake

et al. 2018

Linköping Electronic Conference Proceedings

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“…The combustion processes modelled using EDM are mixing-limited so the complex chemical kinetic rates can be neglected [38]. The coal combustion process was modelled using two-step homogeneous reactions for the gaseous phase (13), (14) and one heterogeneous reaction (C(S)eO 2 ) for char combustion (15).…”

Section: Modelling Combustion Processmentioning

confidence: 99%

“…CðsÞ þ O 2 /CO 2 (15) The stoichiometric coefficients (v O2 , v CO , v H2O , v N2 , v SO2 ) for homogeneous reaction (13) have been calculated by applying mass balance to each of the elements of volatile species…”

Section: Modelling Combustion Processmentioning

confidence: 99%

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Numerical simulations of the industrial circulating fluidized bed boiler under air- and oxy-fuel combustion

Adamczyk

Kozołub

Klimanek

et al. 2015

Applied Thermal Engineering

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h i g h l i g h t s g r a p h i c a l a b s t r a c tHybrid Euler-Lagrange approach was used for modelling particle transport, air-and oxy-fuel combustion process. Numerical results were validated against measured data. The influence of different boiler operating conditions on calculated temperature profile was investigated. New strategy for resolving particle transport in circulating fluidized bed was shown. a b s t r a c tMeasured and numerical results of air-fuel combustion process within large scale industrial circulating fluidized bed (CFB) boiler is presented in this paper. For numerical simulations the industrial compact CFB boiler was selected. Numerical simulations were carried out using three-dimensional model where the dense particulate transport phenomenon was simultaneously modelled with combustion process. The fluidization process was modelled using the hybrid Euler-Lagrange approach. The impact of the geometrical model simplification on predicted mass distribution and temperature profiles over CFB boiler combustion chamber two kinds of geometrical models were used, namely the complete model which consist of combustion chamber, solid separators, external solid super-heaters and simplified boiler geometry which was reduced to the combustion chamber. The evaluated temperature and pressure profiles during numerical simulations were compared against measured data collected during boiler airfuel operation. Collected data was also used for validating numerical model of the oxy-fuel combustion model. Stability of the model and its sensitivity on changes of several input parameters were studied. The comparison of the pressure and temperature profiles for all considered cases gave comparable trends in contrary to measured data. Moreover, some additional test was carried out the check the influence of radiative heat transfer on predicted temperature profile within the CFB boiler.

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“…It has been used for analyzing various gas-solid systems in recent years, considering that its multiphase flow model was developed incorporating dense phase, dilute phase, and packing particles algorithm for reducing computation [17,18,19].Q. Wang et al [20,21] simulated the gas solid flow in a circulating fluidized bed (CFB) with a loop seal. They investigated the influences of operating parameters, including loop seal aeration rate, fluidized air velocity in the riser, and total bed inventory on the solid circulation characteristics.…”

Section: Introductionmentioning

confidence: 99%

Simulation of oil shale semi-coke particle cold transportation in a spouted bed using CPFD method

Zhang

Wang

et al. 2016

Powder Technology

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Abstract：The spouted bed was widely used due to its good mixing of particles and effective phase transferability between the gas and solid phase. In this paper, the transportation process of particles in a 3D spouted bed was studied using the Computational Particle Fluid Dynamics (CPFD) numerical method. Experiments were conducted to verify the validity of the simulation results. Distributions of the pressure, velocities and particle concentration of transportation devices were investigated. The motion state and characteristics of multiphase flows in the transportation device were demonstrated under various operating conditions. The results showed that a good consistency was obtained between the simulated results and the experimental results. The motion characteristics of the gas-solid two-phase flow in the device was effectively predicted, which could assist the optimal operating condition estimation for the spouted transportation process.

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Application of CPFD method in the simulation of a circulating fluidized bed with a loop seal Part II—Investigation of solids circulation

Cited by 69 publications

References 20 publications

CFD Approaches for Modeling Gas-Solids Multiphase Flows - A Review

CFD Approaches for Modeling Gas-Solids Multiphase Flows - A Review

Numerical simulations of the industrial circulating fluidized bed boiler under air- and oxy-fuel combustion

Simulation of oil shale semi-coke particle cold transportation in a spouted bed using CPFD method

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