A numerical study on the wall erosion impact and gas-particle hydrodynamics in circulating fluidized bed riser

Dwivedi, Krishna Kant; Dutta, Subhajit; Loha, Chanchal; Karmakar, Malay; Chatterjee, Pradip K.

doi:10.1016/j.tsep.2021.100852

Cited by 4 publications

(2 citation statements)

References 36 publications

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“…Based on the MP-PIC approach, Li et al 19 assessed the performance of oxidative dehydrogenation of propane in a spouted-bed reactor with or without an internal draft tube. Similarly, Dwivedi et al 20 used the MP-PIC method to explore the impact of different-shaped risers on wall erosion and gas− solid hydrodynamics in a circulating fluidized-bed reactor. Yang et al 21 revealed that the addition of a horizontal baffle in an FCC regenerator might improve the fluidization quality.…”

Section: Introductionmentioning

confidence: 99%

Impact of the Reactor Structure on Biomass Pyrolysis in Fluidized-Bed Reactors: A Coarse-Grained CFD-DEM Study

Wang

Lin

et al. 2021

Energy Fuels

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A coarse-grained computational fluid dynamics coupled with the discrete element method (CFD-DEM) model, combined with a smoothed voidage algorithm and a multicomponent and multistep pyrolysis scheme, has been developed, validated, and used to study biomass pyrolysis in different-shaped fluidized-bed reactors. Correspondingly, fluidized-bed reactors with three different section shapes (i.e., circular, square, and rectangular sections) and gas inlet areas (i.e., 25, 50, and 100% of the bottom section) were devised to explore the effect of the reactor structure on pyrolysis behavior. The simulation results have been extensively analyzed and discussed by various indicators, such as the gas–solid flow patterns, bubble behaviors, pyrolysis product species, biomass reaction rates, and reactor wall erosion depths. It is found that the circular reactor has the largest mean bed height but the lowest fluctuation frequency. Moreover, the circular reactor generally has the largest bubble equivalent diameter at the same height, followed by the square reactor, and the rectangular reactor provides the smallest bubbles. Regarding the effect of the gas inlet area, the fluctuation frequency monotonically increases with reducing the gas inlet area. The largest gas inlet gives the lowest biomass mass loss rate and the smallest bubble equivalent diameter, whereas the other two smaller gas inlets provide quite similar results. Moreover, decreasing the gas inlet area also generates large bubbles more frequently. Finally, the circular reactor suffers the severest wear, followed by the square and the rectangular reactors. These findings are helpful in optimizing the design and operation of biomass fluidized-bed pyrolysis processes.

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Section: Introductionmentioning

confidence: 99%

Impact of the Reactor Structure on Biomass Pyrolysis in Fluidized-Bed Reactors: A Coarse-Grained CFD-DEM Study

Wang

Lin

et al. 2021

Energy Fuels

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“…Computational fluid dynamics (CFD) is an ideal method for the optimal design of the desulfurization spray tower and for the prediction of flow field distribution. Gasliquid two-phase flow can be simulated by Euler-Euler [16][17][18] and Euler-Lagrange [19,20] methods. It is believed that in some studies liquid exists in the form of liquid film, formed on the surface of the structures with its local volume concentration much higher than 10%, which contributes to the application of the Euler-Euler method [10,14].…”

Section: Introductionmentioning

confidence: 99%

Effect of Gas-Liquid Contact Intensification on Heat and Mass Transfer in Deflector and Rod Bank Desulfurization Spray Tower

Jin

Wenju

Li³

2021

Processes

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The deflector and the rod bank are commonly used to optimize flue gas distribution in the original spray tower (OST) of a wet flue gas desulfurization system (WFGD). In this paper, the internal optimization mechanism of the deflector desulfurization spray tower (DST) and the rod bank desulfurization spray tower (RBST) are studied. Based on the Euler–Lagrange method, the standard k-ε turbulence model, an SO2 absorption model and a porous media model, the numerical simulation of the desulfurization spray tower is carried out with the verification of the model rationality. The results show that there are gas-liquid contact intensification effects in DST and RBST. Compared with OST, gas-liquid contact intensification enhances the heat and mass transfer effects of DST and RBST. The temperature difference between inlet and outlet of flue gas increased by 3.3 K and the desulfurization efficiency of DST increased by 1.8%; the pressure drop decreased by 37 Pa. In RBST, the temperature difference between the flue gas inlet and outlet increased by 5.3 K and the desulfurization efficiency increased by 3.6%; the pressure drop increased by 33 Pa.

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Effect of bed particle size on the gas-particle hydrodynamics and wall erosion characteristics in a 550 MWe USC CFB boiler using CPFD simulation

Lee

Kim

Bae

et al. 2022

Energy

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A numerical study on the wall erosion impact and gas-particle hydrodynamics in circulating fluidized bed riser

Cited by 4 publications

References 36 publications

Impact of the Reactor Structure on Biomass Pyrolysis in Fluidized-Bed Reactors: A Coarse-Grained CFD-DEM Study

Impact of the Reactor Structure on Biomass Pyrolysis in Fluidized-Bed Reactors: A Coarse-Grained CFD-DEM Study

Effect of Gas-Liquid Contact Intensification on Heat and Mass Transfer in Deflector and Rod Bank Desulfurization Spray Tower

Effect of bed particle size on the gas-particle hydrodynamics and wall erosion characteristics in a 550 MWe USC CFB boiler using CPFD simulation

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