Shape and size transformations of biomass particles during combustion

Riaza, Juan; Mason, Patrick E.; Jones, Jenny M.; Williams, Alan; Gibbins, Jon; Chalmers, Hannah

doi:10.1016/j.fuel.2019.116334

Cited by 29 publications

(8 citation statements)

References 39 publications

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“…Infrared thermographics can be used for the measurement of the surface temperature of burning biomass particles. 129 However, the determination of the emissivity of the particle may introduce an uncertainty in the temperature measurement. Using two adjacent wavelengths, λ 1 and λ 2 , eq 2 can be rewritten as…”

Section: ■ Recent Development In Numerical Modeling Of Biomass Conver...mentioning

confidence: 99%

“…Thus, the particle surface temperature can be obtained based on the analysis of the thermal radiation spectrum. Infrared thermographics can be used for the measurement of the surface temperature of burning biomass particles . However, the determination of the emissivity of the particle may introduce an uncertainty in the temperature measurement.…”

Section: Optical Studies Of Single Biomass Particle/pellet Conversionmentioning

confidence: 99%

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Recent Development in Numerical Simulations and Experimental Studies of Biomass Thermochemical Conversion

Fatehi

Weng

et al. 2021

Energy Fuels

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Biomass, as a renewable energy source, is available worldwide, is carbon neutral, and can be converted to various types of products depending on the market and on the specific applications. Among different technologies of biomass utilization, thermochemical conversion of biomass is the most efficient method with the shortest time scale of the process. Thermochemical conversion can be used to produce gas or liquid fuels, and it can be used for direct production of heat and electricity. Biomass thermochemical conversion is an active and fast growing field of research. New experimental methods with high spatial and temporal resolution such as laser diagnostics are being introduced, and numerical modeling of the physical and chemical details in biomass conversion is being conducted. In this review, we aim to provide an overview of the recent activities in the field of thermochemical conversion of biomass. Important parameters in the large scale conversion systems, such as temperature distribution, overall conversion rate of fuel, and distribution of different species, are strongly connected to the processes that occur on the scale of a single particle. Understanding the link between transport phenomena, chemical kinetics, and physical transformation on single particle scale can help to unravel issues such as emission and efficiency on the large scale. Hence, the focus of this review is on the single biomass particle, relevant to combustion and gasification systems. Special attention is paid to high fidelity numerical models and state-of-the-art experimental techniques that have been developed or employed over recent years to understand different aspects of biomass thermochemical conversion.

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Section: ■ Recent Development In Numerical Modeling Of Biomass Conver...mentioning

confidence: 99%

Section: Optical Studies Of Single Biomass Particle/pellet Conversionmentioning

confidence: 99%

Recent Development in Numerical Simulations and Experimental Studies of Biomass Thermochemical Conversion

Fatehi

Weng

et al. 2021

Energy Fuels

View full text Add to dashboard Cite

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“…Thus, the average volume of particles can be calculated by the aspect ratio and the average semiminor axis. During gasification, the particle can shrink, its shape might change, and particle fragmentation may also happen. , The effect of particle shrinkage will be separately discussed in Subsection . Pereira and Pinho experimentally investigated the impact of particle fragmentation on the kinetic and diffusive data for biochar fluidized-bed combustion.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…They found that the kinetic and diffusive data were overestimated by 10% and 5%, respectively, when not considering the particle fragmentation. Riaza et al revealed that nonspherical particles could take on a nearly spherical shape during the conversion. However, the particle fragmentation and shape change are not considered in this work due to the immaturity of the submodels.…”

Section: Mathematical Modelmentioning

confidence: 99%

Modeling and Simulation of the Motion and Gasification Behaviors of Superellipsoidal Biomass Particles in an Entrained-Flow Reactor

Zhang

Yang

et al. 2020

Energy Fuels

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Biomass entrained-flow gasification has aroused lots of interest because of its great potential in syngas production. For simplification purposes, traditional computational fluid dynamics simulations of biomass gasification normally assume that the fuel particles have a spherical shape. However, because of the fibrous structure, the ground biomass particles are mostly nonspherical. Thus, in this work, a superellipsoidal model is adopted to describe biomass particles within the Eulerian−Lagrangian framework. The drag, lift, and torque exerted on the particles and particle-wall collisions are all resolved. Moreover, key processes during biomass gasification (e.g., particle dynamics, heat/mass transfer, and chemical reactions) are all considered. Besides the validation, the effects of five particle-related parameters (i.e., particle aspect ratio, shape factor, volume, initial velocity, and shrinking factor) on the motion and gasification behaviors of nonspherical biomass particles in an entrained-flow reactor are explored. Results reveal that the prolate particles are more scattered inside the reactor due to the orientation-related drag and lift forces; small-volume and prolate particles have a higher heating rate and carbon conversion; the particle shape factor and initial velocity do not significantly affect the gasification process within the tested parameter range; and considering the particle shrinkage predicts a lower conversion rate.

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“…29 A woody material and biomass particle combustion has been carried out using a rapid-heating device. 30 A highspeed camera was used to capture the successive combustion processes. The images demonstrated the sequential burning of volatile materials, followed by the burnout of the leftover char.…”

Section: Introductionmentioning

confidence: 99%

Combustion Characteristics and Visualization Analysis of a Biomass Pellet Oriented in Different Positions in a Fixed-Bed Reactor at Different Operating Conditions

El‐Sayed

Khass

Noseir

et al. 2023

Ind. Eng. Chem. Res.

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For all real-world applications, such as fluidized-bed and packed-bed combustion, it is essential to understand the combustion characteristics of an individual solid biomass particle. Under a variety of operating circumstances, investigations on the combustion and mass loss of single pellets of sugarcane (SC) and guava leaves (GL) were conducted. A visualization technique was used to capture the combustion processes of volatile and char. Both homogeneous ignition and hetero–homogeneous simultaneous ignition of both volatiles and char were found. When compared to the material composition and particle-size distribution of the pellet, the brightness of the pellet changed differently with increasing air mass flow rate and hot air temperature. By increasing the hot air temperature and air mass flow rate, the volatile flame of biomass pellets was made shorter and brighter, which lowered the volatile burnout duration. The majority of the entire conversion time is spent on char burning. Compared to other angles, the pellet orientation angle of 30° has a shorter ignition time, a lower surface temperature, and a lower burnout temperature.

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Shape and size transformations of biomass particles during combustion

Abstract: This is a repository copy of Shape and size transformations of biomass particles during combustion.

Cited by 29 publications

References 39 publications

Recent Development in Numerical Simulations and Experimental Studies of Biomass Thermochemical Conversion

Recent Development in Numerical Simulations and Experimental Studies of Biomass Thermochemical Conversion

Modeling and Simulation of the Motion and Gasification Behaviors of Superellipsoidal Biomass Particles in an Entrained-Flow Reactor

Combustion Characteristics and Visualization Analysis of a Biomass Pellet Oriented in Different Positions in a Fixed-Bed Reactor at Different Operating Conditions

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