Numerical study of the biomass pyrolysis process in a spouted bed reactor through computational fluid dynamics

Yang, Shiliang; Dong, Ruijuan; Du, Yanxiang; Wang, Shuai; Wang, Hua

doi:10.1016/j.energy.2020.118839

Cited by 17 publications

(8 citation statements)

References 38 publications

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“…The study ascertained that CFD is the most suitable simulation tool to design, optimize, and perform scale-up of conical spouted bed reactors. In another modeling study, thermochemical and physical properties of biomass undergoing pyrolysis in a spouted bed reactor were numerically examined employing the MP-PIC model . The simulation results drew a fundamental understanding of the complex reactions and solid transport inside the reactor.…”

Section: Modeling Approaches To the Pyrolysis Processmentioning

confidence: 99%

“…In another modeling study, thermochemical and physical properties of biomass undergoing pyrolysis in a spouted bed reactor were numerically examined employing the MP-PIC model. 212 The simulation results drew a fundamental understanding of the complex reactions and solid transport inside the reactor. The numerical results concluded that with an increase in inlet velocity, the vertical flux and gas turbulent motion enhances in the spout region.…”

Section: Modeling Approaches To the Pyrolysismentioning

confidence: 99%

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Recent Modeling Approaches to Biomass Pyrolysis: A Review

2021

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Biomass pyrolysis is a thermochemical conversion process that undergoes a complex set of concurrent and competitive reactions in oxygen-depleted conditions. A considerable amount of the literature uses lumped kinetic approaches to predict pyrolysis products. Despite the prolonged studies, the science of pyrolysis chemistry and models’ capability to simulate the exact conversion phenomenon has unraveled yet. In this review, an initiative was made by compiling existing mathematical models for biomass pyrolysis viz., lumped and distributed kinetic models, particle, and reactor models. An absolute analysis of computational fluid dynamics (CFD), artificial neural network (ANN), and ASPEN Plus models was also conducted. It was observed that the coupling of distributed kinetic models with CFD provides a better understanding of the hydrodynamic reaction of particles under reactive flow with the influence on reactor performance and predicts exact product yield. Furthermore, the pros and cons of each modeling technique are also highlighted individually. Finally, considering the future perspective of biomass pyrolysis with respect to the modeling approach, suggestions have been incorporated.

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Section: Modeling Approaches To the Pyrolysis Processmentioning

confidence: 99%

Section: Modeling Approaches To the Pyrolysismentioning

confidence: 99%

Recent Modeling Approaches to Biomass Pyrolysis: A Review

2021

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“…The same model has also been applied in our previous works. 25,26 However, this model did not consider the influence of bio-oil concentration on secondary reaction, which may deviate the numerical results to some extent. The impact of bio-oil concentration on the secondary reaction please see the literature.…”

Section: Reaction Kineticsmentioning

confidence: 99%

“…Note that although this model was proposed for bubbling fluidized bed, Park et al 32 successfully applied it for biomass pyrolysis in conical spouted bed, demonstrating the reasonability of the model in such reactors. The same model has also been applied in our previous works 25,26 . However, this model did not consider the influence of bio‐oil concentration on secondary reaction, which may deviate the numerical results to some extent.…”

Section: Mathematical Modelsmentioning

confidence: 99%

“…22,23 The MP-PIC method can predict well on the particle motion with acceptable computational cost mainly due to the introduced concept of "computational parcel" and solid stress model. 24 Via the MP-PIC method, Yang et al 25 investigated the effect of gas velocity and operating temperature on the gas thermochemical properties such as gas temperature, density and viscosity during biomass fast pyrolysis. They found that the turbulent viscosity and temperature of gas phase are enhanced by increasing gas velocity and pyrolysis temperature.…”

Section: Introductionmentioning

confidence: 99%

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Numerical investigation of the reactive gas–solid characteristics in biomass fast pyrolysis of conical spouted reactor equipped with draft tube

Sun,

Bao,

Yang

et al. 2023

AIChE Journal

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Biomass fast pyrolysis is a promising technology to produce available char and high‐value gas due to its green and sustainable ability. In the current work, the biomass fast pyrolysis in draft tube spouted bed has been numerically investigated via the multiphase particle‐in‐cell model. In this model, gas turbulence is calculated via large eddy simulation and particles are individually tracked in the Lagrangian manner. This model is successfully validated against experimental data. The particle‐scale information of sand and biomass feedstock has been discussed, and the influence of draft tube configuration on the pyrolysis performance has been studied. The results show that the equipment of draft tube prevents gas leakage from spout to annulus, leading to large axial gas flux in the spout. Biomass particles in the spout and freeboard have high temperature and heat‐transfer coefficient. Some biomass particles move along the outer wall of draft tube, indicating that the equipment of draft tube can avoid back‐mixing by preventing direct contact of particles in the spout and annulus. Increasing the height of draft tube results in larger axial gas flux and higher sand heat‐transfer coefficient, while decreases biomass temperature in the spout. The simulation results can offer valuable insights into comprehending intricate reactive gas–solid characteristics and conducting operation and design optimization of spouting apparatus.

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Fluid dynamics, velocity profile and average cycle time in different configurations of the modified mechanically stirred spouted bed

Barros

Freire

2022

Korean J. Chem. Eng.

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Numerical study of the biomass pyrolysis process in a spouted bed reactor through computational fluid dynamics

Cited by 17 publications

References 38 publications

Recent Modeling Approaches to Biomass Pyrolysis: A Review

Recent Modeling Approaches to Biomass Pyrolysis: A Review

Numerical investigation of the reactive gas–solid characteristics in biomass fast pyrolysis of conical spouted reactor equipped with draft tube

Fluid dynamics, velocity profile and average cycle time in different configurations of the modified mechanically stirred spouted bed

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