Size, shape and flow characterization of ground wood chip and ground wood pellet particles

Rezaei, Hamid; Lim, C. Jim; Lau, Anthony; Sokhansanj, Shahab

doi:10.1016/j.powtec.2016.07.016

Cited by 88 publications

(35 citation statements)

References 42 publications

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“…Frank-Kametsky [33] the dynamics of its thermal decomposition has the strongest influence on the process of ignition of the solid fuel and, accordingly, the output of volatiles. At the same time, as it has been established by the results of the experimental [34,35] and theoretical [28,29] studies, the most intensive process of thermal decomposition (respectively, and the yield of the gaseous pyrolysis products) occurs in tree particles in the form of a sphere, then in a cylinder form and cubes. In this case, we can say that the characteristics and conditions of the process of ignition of the wood particles, which always takes place in the gas phase, will directly depend on a form of a particle.…”

Section: Justification Of the Prospects Of Research Themementioning

confidence: 80%

In vitro Effects of a Novel Silver-based Complex on Influenza Virus

Silnikov¹,

Plotnikov

2018

Journal of Pharmacology and Pharmacotherapeutics

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The results of the experimental and theoretical studies of the processes of the single particles ignition of the wood biomass of various forms (a cube, a cylinder and a sphere) have been presented. According to the results of the experimental studies, it has been established that the particles form can have a fairly significant effect on the characteristics and conditions of ignition. It has been shown that the wood particles in the form of a sphere are ignited much faster than cylindrical and cubic ones (ignition delay times are less by 56%). Such a tendency is maintained for particles sizes from 1 $ 10 À3 m to 3 $ 10 À3 m. According to the results of the experiments, the mathematical model for ignition of a particle of wet wood biomass has been formulated, taking into account the joint occurrence of the main processes of the thermal preparation (radiation-convective particle heating, evaporation of water, thermal decomposition of the organic part of the fuel, output, ignition and combustion of gaseous pyrolysis products, ignition of the char residue). The formulated system of the nonlinear differential equations in the partial derivatives with the corresponding boundary conditions describes the ignition process in a two-dimensional setting, taking into account the substantial nonuniformity of the temperature field of a wood particle in the induction period. We have taken into account that the evaporation process takes place in the front. Up to the present time, the mathematical models of such a degree of detailing of the physical processes occurring together when igniting wet wood have not been formulated. A comparative analysis of the ignition delay times (t ign) obtained theoretically and experimentally has showed their satisfactory correspondence. As a result of the numerical simulation, the temperature fields in the system "a fuel particle d hightemperature medium" have been obtained, illustrating the high gradients of the temperatures at the moment of ignition. It has been established that it is possible to ignite the water-saturated wood particles before they dry completely. It has been established that the ignition mode of wood particles is possible before they dry completely.

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Section: Justification Of the Prospects Of Research Themementioning

confidence: 80%

In vitro Effects of a Novel Silver-based Complex on Influenza Virus

Silnikov¹,

Plotnikov

2018

Journal of Pharmacology and Pharmacotherapeutics

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“…Indeed, Tannous et al [28] verified that this method underestimates the real particle size and can lead to a difference greater than 100%. Other authors have also identified this behavior in which the sieving method underestimates the size of irregularly shaped particles, as seen in Olatunde et al [29] and Rezaei et al [30]. The exact definition of a mean particle diameter for a non-homogeneous material remains as a point of debate in fluidization research circles.…”

Section: Comparison With Prediction Methodsmentioning

confidence: 91%

Fluidization of binary mixtures of biomass and coal with sand: an experimental study

Genehr

Silva

Zinani

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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The aim of this work was to characterize the fluid dynamic behavior of mixtures of biomass with sand as inert material and to determine the fluidization curves of each mixture. For comparison purposes, mixtures of coal with sand were also studied. Biomasses investigated were eucalyptus bark (Eucalyptus sp.), pine bark (Pinus elliottii), and pine wood chips. The experiment was performed in a scaled cold reactor with internal diameter of 94 mm and 1200 mm in height. Samples had average particle sizes of 0.537 mm (eucalyptus bark), 0.579 mm (pine bark), 0.729 mm (pine chip) and 0.680 mm (coal). The mixtures with sand were made in proportions between 20 and 60% of biomass or coal in volume. Fluidization curves were analyzed, and the minimum fluidization velocity (u mf) was determined. The minimum fluidization velocity was highly affected by biomass concentration and type, meaning that even for similar density and particle size, biomass morphology and composition are influential features in the process of fluidization. The experimental results of the minimum fluidization velocity were compared with empirical correlations from literature. The errors were very large, suggesting the need to develop specific correlations for these types of biomasses.

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“…Rezaei [68] stated that size of particles [69], initial moisture content [70], drying temperature [69,71], relative humidity of drying gas [72,73] and particle heating rate [74] influence the rate of moisture loss. Rezaei et al [75] showed that biomass shrinks during the moisture loss that influences the drying rate.…”

Section: Moisture Reductionmentioning

confidence: 99%

“…On the other hand, grinding the biomass to smaller particles requires more energy input. Rezaei et al [81] reported that grinding wood chips to produce particles with average sizes of 1, 1.8, 3 and 5 mm requires about 124.0, 85. the power required for size reduction of coal, torrefied woodcutting, willow and demolition wood. He showed that to have particles smaller than 0.6 mm, the grinding power consumption increases sharply.…”

Section: Size Reductionmentioning

confidence: 99%

Woody Feedstock Pretreatments to Enhance Pyrolysis Bio-oil Quality and Produce Transportation Fuel

Rezaei¹,

Yazdanpanah²,

Lim³

et al. 2019

Biomass for Bioenergy - Recent Trends and Future Challenges

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Lignocellulosic biomass as a potential renewable source of energy has a nearzero CO 2 emission. Pyrolysis converts biomass to a liquid fuel and increases the energy density and transportability. The pyrolysis bio-oil shows promising properties to substitute the conventional fossil fuels. But, unprocessed biomass is low in bulk and energy density; high in moisture; heterogeneous in physical and chemical properties, highly hygroscopic and difficult to handle. That is why the biomass needs mechanical, chemical and/or thermal pretreatments to turn into a more homogeneous feedstock and minimize the post-treatment fuel upgrading. This chapter explains the effects that various pretreatments such as size reduction, drying, washing and thermal pretreatments have on the quality and quantity of bio-oil. Washing with water or acid/alkali solutions extracts the minerals that consequently reduces the ash and shortens the reactor clean-out cycle. Torrefaction is gaining attention as an effective pretreatment to modify the quality of biomass in terms of physical and chemical properties. Torrefaction produces a uniform biomass with lower moisture, acidity and oxygen contents and higher energy density and grindability than raw biomass. Pyrolysis of torrefied biomass produces bio-oil with enhanced compositional and physical properties such as a higher heating value and increased C (lower O/C ratio).

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Size, shape and flow characterization of ground wood chip and ground wood pellet particles

Cited by 88 publications

References 42 publications

In vitro Effects of a Novel Silver-based Complex on Influenza Virus

In vitro Effects of a Novel Silver-based Complex on Influenza Virus

Fluidization of binary mixtures of biomass and coal with sand: an experimental study

Woody Feedstock Pretreatments to Enhance Pyrolysis Bio-oil Quality and Produce Transportation Fuel

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