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

Zhang, Lidong; Wang, Zijia; Wang, Qing; Qin, Hong; Xu, Xiandong

doi:10.1016/j.powtec.2016.06.012

Cited by 11 publications

(4 citation statements)

References 23 publications

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“…Zhang and colleagues [131] reproduced a spouted bed employed as a pneumatic transporter of oil shale semi-coke particles. The model was validated by comparisons of the pressure drops, velocity and volume fraction distributions, and the feasibility of the process was proved.…”

Section: Dem Applied To Auxiliary Devicesmentioning

confidence: 99%

Modelling of Spouted and Spout-Fluid Beds: Key for Their Successful Scale Up

et al. 2017

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The development of robust mathematical models could provide the necessary tools for a more rapid, efficient, and reliable spouted bed technology development. Computer simulations can be very useful to aid this design and scale-up process: firstly, they can contribute to obtain a fundamental insight into their complex dynamic behavior by understanding the elementary physical principles such as drag, friction, dissipation etc.; secondly, the simulations can be used as a design tool where the ultimate goal is to have a numerical model with predictive capabilities for gas-particle flows at engineering scale. Clearly, one single simulation method will not be able to achieve this goal, but a hierarchy of methods modelling phenomena on different length and time scales can achieve this. The most fruitful approach will be when they are simultaneously followed, so that they can mutually benefit from each other. In this sense, this paper presents a review of the current state of the art of modelling on spouted and spout-fluid beds through an analysis of recent literature following a multiscale approach (molecular and particle, lab, plant and industrial scale). The main features of the different scales together with their current limits are discussed and specific topics are highlighted as paths that still need to be explored. In summary, the paper aims to define the theoretical setline and the basis of improvement that would lead to a robust multiscale model with solid links between micro and macroscopic phenomena. If done with the correct balance between accuracy and computational costs it will gear SB towards their reliable and successful implementation.

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Section: Dem Applied To Auxiliary Devicesmentioning

confidence: 99%

Modelling of Spouted and Spout-Fluid Beds: Key for Their Successful Scale Up

et al. 2017

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“…Hence, a further study on the multistage interconnected fluidized bed is realized. At present, plenty of studies have employed the CPFD method in the multiphase flow, including bubbling bed, 23 spouted bed, 24 and circulating bed. 25 The relatively reasonable results have proved the feasibility of the CPFD simulations.…”

Section: Introductionmentioning

confidence: 99%

Simulation and Optimization of a Multistage Interconnected Fluidized Bed Reactor for Coal Chemical Looping Combustion

et al. 2022

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This work established a three-dimensional model of a chemical looping system with multistage reactors coupled with hydrodynamics and chemical reactions. The thermal characteristics in the chemical looping combustion (CLC) system were simulated using coal as fuel and hematite as an oxygen carrier (OC). Some significant aspects, including gas composition, particle residence time, backmixing rate, wall erosion, carbon capture rate, etc., were investigated in the simulation. Owing to the optimization by adding baffles in the fuel reactor (FR), the gas conversion capacity of the multistage FR was high, where the outlet CO2 concentration was as high as 93.8% and the oxygen demand was as low as 3.8%. Through tracing and analyzing the path of char particles, we found that the residence time of most char particles was too short to be fully gasified. The residual char will be entrained into the air reactor (AR), reducing the CO2 capture rate, which is only 80.3%. In the simulation, the wall erosion on the cyclone could be relieved by increasing the height of the horizontal pipe. In addition, improving the structure of the AR loop seal could control the residual char entrained by OC particles to the AR, and the CO2 capture rate was increased up to 90% in the multistage CLC reactor.

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“…Barracuda has already been used for studies over a broad range of fluidization regimes, ranging from bubbling beds [3]- [5], spouting beds [6], risers [7]- [12], and full loop circulating fluidized beds (CFBs) [13]- [18]. A brief literature review of already conducted simulations of CFBs is given subsequently.…”

Section: Introductionmentioning

confidence: 99%

CPFD simulation of a dual fluidized bed cold flow model

Lunzer

Kraft

Müller

et al. 2021

Biomass Conv. Bioref.

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The present work was carried out to simulate a cold flow model of a biomass gasification plant. The fluid dynamical behavior depends heavily on the particles' properties like the particle size distribution (PSD). For the simulation an Eulerian-Lagrangian approach, in particular by the multi-phase particle in cell (MP-PIC) method, was used to simulate particles with a defined PSD. Therefore, Barracuda VR, a software tool with an implemented MP-PIC method specifically designed for CPFD (computational particle fluid dynamics) simulations, was the software of choice. The simulation results were verified with data of previously conducted experiments on a physical cold flow model. The cold flow model was operated with air and bronze particles. The simulations were conducted with different drag laws: an energyminimization multi-scale (EMMS) approach, a blended Wen-Yu and Ergun (WYE) drag law, and a drag law of Ganser. Furthermore, a focus was set onto the normal particle stress (P S value variation), which is significant in close-packed regions, and the loop seals' fluidization rate was varied to influence the particle circulation rate. The settings of the simulation were optimized, flooding behavior did not occur in advanced simulations, and the simulations reached a stable steady state behavior. The Ganser drag law combined with an adjusted P S value with (P S = 30 Pa) or without (P S = 50 Pa) increased loop seal fluidization rates provided the best simulation results.

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

Cited by 11 publications

References 23 publications

Modelling of Spouted and Spout-Fluid Beds: Key for Their Successful Scale Up

Modelling of Spouted and Spout-Fluid Beds: Key for Their Successful Scale Up

Simulation and Optimization of a Multistage Interconnected Fluidized Bed Reactor for Coal Chemical Looping Combustion

CPFD simulation of a dual fluidized bed cold flow model

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