4.7 Article

Comprehensive DEM-CFD model and thermal uniformity optimization for biomass catalytic pyrolysis reactor

Related references

Note: Only part of the references are listed.
Article Thermodynamics

Kinetic and thermodynamic analysis of biomass catalytic pyrolysis with nascent biochar in a two-stage reactor

Siyu Wang et al.

Summary: This study carried out kinetic and thermodynamic analysis to investigate the interaction between nascent biochar and volatiles. It was found that nascent biochar effectively reduced the activation energy of pyrolysis and facilitated the decomposition of lignin. It also promoted the conversion from CO2 to CO and the production of H2, improved the purity of the pyrolysis product, and reduced the selectivity of acid, alcohol, and ester. High selectivity of phenolic and ether products was achieved through in-situ and ex-situ catalysis.

COMBUSTION AND FLAME (2023)

Article Thermodynamics

Multi-scale modelling of a fluidized bed biomass gasifier of industrial size (1 MW) using a detailed particle model coupled to CFD: Proof of feasibility and advantages over simplified approaches

Lukas von Berg et al.

Summary: This study applies a multi-scale modelling approach to a fluidized bed biomass gasifier of industrial size for the first time. The results are compared with a simulation using a simplified uniform conversion model (UCM), which is commonly used in literature. The validation at the particle level shows that the UCM underpredicts the time needed for pyrolysis, while the progressive conversion model (PCM) is in good agreement with experimental data. The coupled simulations using PCM demonstrate the numerical feasibility of the modelling approach and highlight the importance of a comprehensive description of the particle level.

ENERGY CONVERSION AND MANAGEMENT (2023)

Article Thermodynamics

Study of air-steam gasification of spherocylindrical biomass particles in a fluidized bed by using CFD-DEM coupling with the multi-sphere model

Runhui Zhang et al.

Summary: A reactive CFD-DEM coupling with the multi-sphere model is established and used to investigate the air-steam gasification of spherocylindrical biomass particles in a fluidized bed. The effect of biomass particle aspect ratio on various indicators is systematically explored, showing that increasing the particle aspect ratio can accelerate biomass conversion processes and enhance particle orientation behavior in the fluidization region.

ENERGY CONVERSION AND MANAGEMENT (2023)

Article Energy & Fuels

Experimental and numerical study on thermal performance of an indirectly irradiated solar reactor with a clapboard-type internally circulating fluidized bed

Xian Li et al.

Summary: Fluidized-bed based solar reactors for biomass gasification are considered promising for producing high-quality syngas. A novel high-temperature solar reactor was designed and investigated under a high-flux solar simulator. Experiment and simulation results showed that increasing bed mass can mitigate overheating, and gas flow rate is influenced by particle properties and reactor geometry.

APPLIED ENERGY (2022)

Article Engineering, Environmental

Advanced DEM simulation on powder mixing for ellipsoidal particles in an industrial mixer

Yuki Mori et al.

Summary: The ellipsoidal DEM/SDF model demonstrates the applicability and feasibility of non-spherical particles in industrial mixing process, which is crucial for the optimization of mixer design and operational conditions in chemical, food, and pharmaceutical engineering fields.

CHEMICAL ENGINEERING JOURNAL (2022)

Article Engineering, Chemical

Experimental study on the temperature distribution in fluidised beds

E. Milacic et al.

Summary: Heat management issues are common in reactors during highly exothermic chemical reactions. Fluidised bed reactors are preferred due to their excellent heat transfer capabilities, but face challenges in design, scale-up, and operation. Infrared thermography can provide insights into temperature non-uniformity, with standard deviation and skewness serving as indicators for granular mixing behavior in different fluidisation regimes.

CHEMICAL ENGINEERING SCIENCE (2022)

Article Engineering, Chemical

Effects of gas composition and operating pressure on the heat transfer in an oxy-fuel fluidized bed: A CFD-DEM study

Guoqing Lian et al.

Summary: CFD-DEM modeling was used to investigate particle heat transfer in an oxy-fuel fluidized bed under different gas compositions and operating pressures. The study revealed that particle heat transfer is influenced by gas density, specific heat capacity, and fluidization velocity, with an increase in operating pressure leading to an increase in particle heat transfer.

CHEMICAL ENGINEERING SCIENCE (2022)

Article Thermodynamics

Enhancement of the production of chemicals and liquid fuels from grass biowaste via NaOH-Fenton pretreatment coupled with fast pyrolysis

Kai Wu et al.

Summary: A novel two-stage process based on NaOH-Fenton pretreatment coupled with fast pyrolysis was proposed to improve the yield of target chemicals and achieve effective concentration and removal rates of nitrogen and sulfur. The process successfully converted grass biowaste into value-added chemicals and liquid fuels.

ENERGY CONVERSION AND MANAGEMENT (2022)

Article Engineering, Chemical

Design optimization and scale-up characteristics of a double-helical ribbon reactor for biomass catalytic pyrolysis

Siyu Wang et al.

Summary: A novel double-helical ribbon reactor was designed for biomass catalytic pyrolysis, with DEM simulations performed to optimize the structure and operating conditions. The study found that mixture homogeneity was closely related to the impeller outer diameter and rotation speed, and mixing rate could be optimized by adjusting the inner diameter and pitch.

POWDER TECHNOLOGY (2022)

Article Energy & Fuels

Three-dimensional modelling and optimization of an industrial dual fluidized bed biomass gasification decoupling combustion reactor

Panxing Kang et al.

Summary: The dual fluidized bed biomass gasification decoupling combustion technology shows promise in achieving highly efficient combustion for high-water-containing biomass fuel and lower NOx emission. By optimizing the secondary air operating parameters, the performance of the biomass gasification combustion reactor can be enhanced. Adjusting the total secondary air ratio, upper secondary air ratio, and upper secondary air height can affect the gas-phase entrainment effects and overall biomass combustion efficiency.

APPLIED ENERGY (2022)

Article Energy & Fuels

Experimental evaluation of an innovative radial-flow high-temperature packed bed thermal energy storage

Silvia Trevisan et al.

Summary: This study presents an experimental setup of a high-temperature packed-bed thermal energy storage system and evaluates its performance. The results show that radial-flow packed-bed designs have the advantage of reduced pressure drops, but thermocline degradation is the main weakness of this design.

APPLIED ENERGY (2022)

Article Energy & Fuels

A continuum model for heat and mass transfer in moving-bed reactors for thermochemical energy storage

David Korba et al.

Summary: In this study, a continuum heat and mass transfer model was developed for stationary packed-bed and counter-flow moving-bed reactors. The model was validated and compared with a previous 1D model. The results show that capturing the radial variation is critical in reactor modeling, and the 2D model demonstrates improved agreement with experiments.

APPLIED ENERGY (2022)

Article Engineering, Chemical

Simulation and optimization of heating rate and thermal uniformity of microwave reactor for biomass pyrolysis

Sikan Wu et al.

Summary: Microwave pyrolysis for hydrogen production from biomass has attracted considerable attention. In this study, the optimal parameters for microwave power density, loading radius, and bulk density were determined through simulations and experiments, demonstrating the advantages of the optimization method.

CHEMICAL ENGINEERING SCIENCE (2022)

Article Thermodynamics

Rapid change of particle velocity due to volatile gas release during biomass devolatilization

Angel David Garcia Llamas et al.

Summary: This study investigates discrepancies between simulation and experimental results for devolatilizing biomass particles, focusing on differences in velocity, shape, and conversion behavior related to rocket-like motions. By using a particle size dependent devolatilization model, more accurate descriptions of devolatilization processes can be achieved.

COMBUSTION AND FLAME (2022)

Article Engineering, Chemical

Liquid injection in a fluidised bed: Temperature uniformity

E. Milacic et al.

Summary: Liquid injection in fluidized beds has a significant impact on the temperature uniformity and agglomeration behavior. The size and velocity of the injected droplets play a crucial role in determining the temperature distribution and agglomerate formation in the bed.

CHEMICAL ENGINEERING SCIENCE (2022)

Article Thermodynamics

Study on ZSM-5 catalytic pyrolysis mechanism of cellulose based on the Py-GC/MS and the density functional theory

Xiaoxue Cheng et al.

Summary: In this study, the products and reaction mechanisms of cellulose during non-catalytic and catalytic pyrolysis with ZSM-5 catalyst were analyzed using Py-GC/MS and DFT. The results showed that catalytic pyrolysis reduced the furan content and introduced aromatic hydrocarbons as new components. DFT studies demonstrated the involvement of hydrogen proton at the catalyst's acid sites in most cellulose pyrolysis reactions. Catalytic pyrolysis significantly lowered the activation energy for dehydration and de-carbonylation compared to non-catalytic pyrolysis.

COMBUSTION AND FLAME (2022)

Article Energy & Fuels

Melting assessment on the effect of nonuniform Y-shaped fin upon solid-liquid phase change in a thermal storage tank

Zhan Liu et al.

Summary: This study provides an alternative solution to improve solid-liquid phase change by designing a nonuniform Y-shaped fin. The results show that the nonuniform fin structure significantly eliminates the nonuniform melting caused by local natural convection and reduces the complete melting time.

APPLIED ENERGY (2022)

Article Thermodynamics

Solar pyrolysis of biomass - part I: Volatile evolution mechanism

Dian Zhong et al.

Summary: This study investigated the volatile evolution mechanism during solar pyrolysis of biomass, and found that pellet thickness and heat flux density significantly affected the product composition. Secondary reactions were found to promote the cracking, deoxygenation, and condensation of sugars and phenolic species, as well as the growth of condensed aromatic hydrocarbons. A new dimensionless number was proposed to evaluate the solar pyrolysis behavior, which can provide guidance for optimizing the operating conditions of solar gasification of biomass.

ENERGY CONVERSION AND MANAGEMENT (2022)

Article Thermodynamics

Three-Dimensional CFD simulation of waste plastic (SRF) gasification in a bubbling fluidized bed with detailed kinetic chemical model

Diyar Tokmurzin et al.

Summary: A three-dimensional computational fluid dynamics (CFD) model was developed to simulate the gasification process of solid refuse fuel (SRF). The model was validated by comparing the simulation results with experimental data. The study found that changing the air-to-fuel equivalence ratio and SRF feed location can impact the yield of syngas and C-2-C-3 hydrocarbons.

ENERGY CONVERSION AND MANAGEMENT (2022)

Article Mathematics, Interdisciplinary Applications

Wall to particle bed contact conduction heat transfer in a rotary drum using DEM

Manogna Adepu et al.

Summary: The study found that different heat transfer coefficients result from the variability in particle size distribution with the same mean and standard deviation. Monodispersed particle beds exhibit better heat transfer compared to polydispersed beds. Rotation speed has minimal impact on conduction heat transfer, while better heat transfer is achieved at lower values of rolling friction.

COMPUTATIONAL PARTICLE MECHANICS (2021)

Article Engineering, Environmental

Particle-scale evaluation of the pyrolysis process of biomass material in a reactive gas-solid spouted reactor

Shiliang Yang et al.

Summary: The study on biomass pyrolysis in a spouted bed reactor reveals that the heat transfer coefficient of particles varies with bed height and shows significant distribution differences in different regions. The temperature and heat transfer coefficient of biomass increase with the rise of pyrolysis temperature, while the effect of gas velocity on the heat transfer coefficient is insignificant.

CHEMICAL ENGINEERING JOURNAL (2021)

Article Thermodynamics

Study on the combustion behavior and soot formation of single coal particle using hyperspectral imaging technique

Mengting Si et al.

Summary: This study utilized hyperspectral imaging technique to observe the real-time combustion behaviors of single coal particles and investigated the distribution rules of soot temperature and concentration using spectral radiative intensity images. The results show that the temperature remained relatively stable during the oxidation of chars, while the spectral emissivity increased and then decreased with the oxidation process.

COMBUSTION AND FLAME (2021)

Article Engineering, Chemical

Simulation investigation of heating rate and temperature uniformity in fluidized bed

Jiazhe Xue et al.

Summary: In this study, the hydrodynamics and gas-solid heat transfer characteristics during bed material heating process were investigated using the CFD-DEM method. The results showed that internal circulation behavior weakened the phenomenon of overheating at the bottom of the bed, and with time progression, the bed temperature uniformity was effectively improved.

CHEMICAL ENGINEERING SCIENCE (2021)

Article Engineering, Chemical

Comparative CFD modeling of a bubbling bed using a Eulerian-Eulerian two-fluid model (TFM) and a Eulerian-Lagrangian dense discrete phase model (DDPM)

Muhammad Adnan et al.

Summary: The study compared the performance of Eulerian-Eulerian and Eulerian-Lagrangian numerical approaches in describing the hydrodynamic behavior of a pilot-scale bubbling bed reactor. The sub-grid drag correction based on the energy minimization and multiscale theory was found to be the key modeling parameter for both models. Both models predicted similar hydrodynamics behavior, with TFM achieving better accuracy in terms of axial and radial solids concentration profiles. The grid size analysis showed that DDPM generated a better grid-independent solution than TFM, making it a suitable candidate for large-scale industrial applications on coarser grids. Other parameters like time-step, time-averaging interval, specularity coefficient, restitution coefficient, reflection coefficient, and numbers of parcels had minor effects on the overall hydrodynamics behavior of the reactor.

POWDER TECHNOLOGY (2021)

Article Energy & Fuels

Experimental validation of a multiphase flow model of a lab-scale fluidized-bed gasification unit

Andrea Porcu et al.

Summary: This study presents experimental and computational characterization of biomass gasification process for power generation and green hydrogen production. The results show that biomass pyrolysis yields syngas, while gasification produces syngas with accurate predictions for CO, H-2, and CH4 compositions. The model used in the study is an effective predictive tool for simulating the process.

APPLIED ENERGY (2021)

Article Engineering, Environmental

Simulations of biomass pyrolysis using glued-sphere CFD-DEM with 3-D intra-particle models

Liqiang Lu et al.

Summary: This research utilized a glued-sphere computational fluid dynamic discrete element method to investigate the effects of biomass particle shapes and sizes on pyrolysis. The study revealed significant influences of surface areas and mass distributions on interphase heat transfer and chemical reactions, with neglectable intra-particle heat transfer for certain conditions. Different reactor types were simulated to analyze conversion distributions, showing the best balance between uniform and fast conversion in the fluidized bed.

CHEMICAL ENGINEERING JOURNAL (2021)

Review Chemistry, Physical

Progress and Perspectives in Photo- and Electrochemical-Oxidation of Biomass for Sustainable Chemicals and Hydrogen Production

Hui Luo et al.

Summary: Biomass is a recognized ideal resource substitute for fossil fuels, with oxidation derivatives from biomass-derived compounds being used in the production of biodegradable polymers and pharmaceuticals. Combining biomass oxidation with hydrogen generation reactions presents a promising strategy for coproducing high value chemicals and hydrogen.

ADVANCED ENERGY MATERIALS (2021)

Article Engineering, Chemical

CFD-DEM study of the effects of food grain properties on drying and shrinkage in a fluidised bed

Jannatul Azmir et al.

POWDER TECHNOLOGY (2020)

Article Green & Sustainable Science & Technology

A novel heat transfer model of biomass briquettes based on secondary development in EDEM

Yudi Li et al.

RENEWABLE ENERGY (2019)

Article Chemistry, Analytical

Novel helical screw-fluidized bed reactor for bio-oil production in slow-pyrolysis mode: A preliminary study

Khan Muhammad Qureshi et al.

JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS (2019)

Review Engineering, Chemical

Multiscale structures in particle-fluid systems: Characterization, modeling, and simulation

Wei Ge et al.

CHEMICAL ENGINEERING SCIENCE (2019)

Article Environmental Sciences

Characterization of Barley Straw, Hemp Shiv and Corn Cob as Resources for Bioaggregate Based Building Materials

Aurelie Laborel-Preneron et al.

WASTE AND BIOMASS VALORIZATION (2018)

Article Engineering, Chemical

Particle scale modeling of heat transfer in granular flows in a double screw reactor

Fenglei Qi et al.

POWDER TECHNOLOGY (2018)

Article Thermodynamics

Effects of nascent char on ex-situ catalytic fast pyrolysis of wheat straw

Changsong Hu et al.

ENERGY CONVERSION AND MANAGEMENT (2018)

Article Engineering, Multidisciplinary

Establishing stable time-steps for DEM simulations of non-collinear planar collisions with linear contact laws

Shane J. Burns et al.

INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING (2017)

Article Construction & Building Technology

Effect of Plant Aggregates on Mechanical Properties of Earth Bricks

A. Laborel-Preneron et al.

JOURNAL OF MATERIALS IN CIVIL ENGINEERING (2017)

Article Chemistry, Multidisciplinary

Overview of Computational Fluid Dynamics Simulation of Reactor-Scale Biomass Pyrolysis

Qingang Xiong et al.

ACS SUSTAINABLE CHEMISTRY & ENGINEERING (2017)

Article Energy & Fuels

Modeling and pilot plant runs of slow biomass pyrolysis in a rotary kiln

Matthaus U. Babler et al.

APPLIED ENERGY (2017)

Article Engineering, Chemical

The Lift on a Disc Immersed in a Rotating Granular Bed

Bhanjan Debnath et al.

AICHE JOURNAL (2017)

Review Engineering, Chemical

CFD simulation of dense particulate reaction system: Approaches, recent advances and applications

Wenqi Zhong et al.

CHEMICAL ENGINEERING SCIENCE (2016)

Article Engineering, Chemical

CFD-DEM simulation of biomass gasification with steam in a fluidized bed reactor

Xiaoke Ku et al.

CHEMICAL ENGINEERING SCIENCE (2015)

Article Engineering, Chemical

Parallel algorithms for CFD-DEM modeling of dense particulate flows

C. L. Wu et al.

CHEMICAL ENGINEERING SCIENCE (2014)

Article Engineering, Environmental

Three-dimensional discrete particle model for gas-solid fluidized beds on unstructured mesh

C. L. Wu et al.

CHEMICAL ENGINEERING JOURNAL (2009)

Article Chemistry, Applied

Synergies in co-pyrolysis of Thai lignite and corncob

Taro Sonobe et al.

FUEL PROCESSING TECHNOLOGY (2008)

Article Thermodynamics

Measurements of heat transfer between particles and gas in packed beds at low to medium Reynolds numbers

Elisabeth Schroeder et al.

EXPERIMENTAL THERMAL AND FLUID SCIENCE (2006)

Article Energy & Fuels

An overview of Biomass pyrolysis

A Demirbas et al.

ENERGY SOURCES (2002)