Multi-scale simulation of chemical looping combustion in dual circulating fluidized bed

Wang, Shuai; Chen, Juhui; Huilin, Lu; Liu, Guodong; Sun, Libin

doi:10.1016/j.apenergy.2015.05.109

Cited by 25 publications

(4 citation statements)

References 32 publications

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“…The distribution of temperature in the system is consistent with the theoretical analysis. We get a similar trend of temperature as in the work of Want et al [17] on a CLC simulation. To assess the state of the oxygen carrier, the oxidation level is calculated at the inlet and outlet of AR and shown in Figure 7.…”

Section: Reaction Behavior Of Clc Systemsupporting

confidence: 83%

“…The experiments for the CLC system with dual interconnected fluidized reactors have been successfully carried out at lab scale and pilot scale, with both gaseous fuel and solid fuel [6][7][8], coal [7,9], petroleum [10], biomass [11] and liquid fuel [12], which prove the feasibility of the CLC technology. At the same, researchers have used the numerical method to investigate the operating behaviour of the CLC system, which is difficult for experimental measurement [13,14], and it has played a more and more important role for investigating the CLC system [15][16][17]. Two main methods, two-fluid model and discrete element method (DEM), are utilized for simulating the CLC system [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of a 10 kW Gas-Fueled Chemical Looping Combustion Unit

et al. 2022

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Chemical looping combustion is one novel technology for controlling CO2 emission with a low energy cost. Due to a lack of understanding of the detailed and micro behavior of the CLC process, especially for a three dimensional structure, numerical simulations are carried out in this work. The configuration is built according to the experimental unit and gaseous fuel is used in this work. A two-fluid model considering heterogeneous reactions is established, and the flow behaviour and reaction characteristics are obtained. The temperature in the air reactor increases with height owing to the exothermic reaction of the xidation of the oxygen carrier, while the temperature in the fuel reactor decreases with height due to the endothermic reaction. The oxidation level of the oxygen carrier is obtained by simulation, which is hard for measurement, and the difference between the inlet and outlet is 0.065. The influences of the operating temperature and injection rate of fuel are presented to understand the performance of the system. The highest fuel conversion rate reaches 0.92 under high operating temperature. The numerical results are helpful for acquiring insight on the flow and reactive behaviour of CLC reactors.

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Section: Reaction Behavior Of Clc Systemsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of a 10 kW Gas-Fueled Chemical Looping Combustion Unit

et al. 2022

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“…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.…”

Section: Of 17mentioning

confidence: 99%

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

et al. 2019

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The in-depth understanding of the gas–solid flow and reaction behaviors, and their coupling characteristics during the chemical looping combustion (CLC) process has the guiding significance for the operation and optimization of a chemical looping combustor. A three-dimensional numerical model is applied to investigate the char-fueled CLC characteristics in a fuel reactor for efficient CO2 separation and capture. Simulations are carried out in a bubbling fluidized bed fuel reactor with a height of 2.0 m and a diameter of 0.22 m. The initial bed height is 1.1 m, and hence the height–diameter ratio of the slumped bed is five. The oxygen carrier is prepared with 14 wt% of CuO on 86 wt% of inert Al2O3. In the process of mathematical modeling, a Eulerian-Eulerian two-fluid model is adopted for both of the gas and solid phases. Gas turbulence is modeled on the basis of a k–ε turbulent model. The reaction kinetics parameters are addressed based upon previous experimental investigations from literature. During the simulation, the gas–solid flow patterns, composition distributions, and reaction characteristics are obtained. Moreover, the effects of solids inventory and fluidizing number on the reaction performance are elucidated in-depth. The results have shown that the reaction rates have close relationship with the flow patterns and the distributions of gas concentrations. Compared to the steam-char gasification over sand, the application of char-fueled CLC can effectively promote the conversion of gasification products. In addition, higher CO2 concentration at the outlet can be achieved by increasing the initial solids inventory or decreasing the fluidizing number. Some calculated values are verified by the previous data, indicating that the current three-dimensional models are reasonable to study the process mechanism of char-fueled CLC.

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“…Computational Fluid Dynamics (CFD) has been applied to study the hydrodynamics in a dual fluidized bed system [8][9][10][11]. The Eulerian-Eulerian (E-E) approach is commonly used [9,[12][13][14], because it requires less computational resources than the Eulerian-Lagrangian (E-L) approach [15].…”

Section: Introductionmentioning

confidence: 99%

Three dimensional full-loop CFD simulation of hydrodynamics in a pilot-scale dual fluidized bed system for biomass gasification

Luo

Lin

Song

et al. 2019

Fuel Processing Technology

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A three-dimensional CFD model was developed to simulate the hydrodynamics in a pilot-scale dual fluidized bed system for biomass gasification. The system includes a fast fluidized bed (FFB) for char combustion, a cyclone separator, two loop-seals, and a bubbling fluidized bed (BFB) for biomass gasification. A comparison of a hybrid EMMS drag model (i.e. the EMMS/matrix drag model for FFB, and the EMMS/bubbling drag model for BFB) proposed in this paper and the Gidaspow drag model was carried out at air and steam gasification conditions. The solid circulation rate, solid inventory distribution, and the pressure distribution predicted by the hybrid EMMS drag model were in better agreement with experimental data. The effect of solid inventory on hydrodynamics was evaluated by using the hybrid EMMS drag model. The results indicate that the solid circulation rate and its fluctuation increased with increasing solid inventory. In the simulated system, the operating stability was reduced when the solid inventory was increased to 200 kg due to "choking" phenomenon.

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Multi-scale simulation of chemical looping combustion in dual circulating fluidized bed

Cited by 25 publications

References 32 publications

Numerical Simulation of a 10 kW Gas-Fueled Chemical Looping Combustion Unit

Numerical Simulation of a 10 kW Gas-Fueled Chemical Looping Combustion Unit

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

Three dimensional full-loop CFD simulation of hydrodynamics in a pilot-scale dual fluidized bed system for biomass gasification

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