Experimental Study on Effects of Particle Shape and Operating Conditions on Combustion Characteristics of Single Biomass Particles

Momeni, Maryam; Yin, Chungen; Kær, Søren Knudsen; Hansen, Troels Bruun; Jensen, Peter Arendt; Glarborg, Peter

doi:10.1021/ef301343q

Cited by 73 publications

(74 citation statements)

References 23 publications

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“…The temperatures in large scale pulverized fuel furnaces are in a similar range and, while oxygen concentration varies depending on fuel/air mix and position in the flame, this is also not unrepresentative. An extension to the experiment may consider creating different oxygen conditions as has been achieved in othersÕ experiments using alternative apparatus [15].…”

Section: Combustion Apparatusmentioning

confidence: 99%

“…furnace. However there have been a number of experimental methods documented which examine combustion behaviour of biomass particle dimensions in the order of 1mm [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…[15,16] developed experimental apparatus using a gas burner and mass flow controllers to control the temperature and oxygen concentration in a vertical tube reactor in which single particles were placed for observing the combustion behaviour. The experiment examined ignition, devolatilisation and char burn-out for cylindrical particles with similar mass (12.5mg) with aspect ratios ranging from 1 to 6 and for gas temperatures ranging from 1200¡C to 1600¡C (with oxygen concentrations ranging from 5 to 20% for the burn-out tests).…”

Section: Introductionmentioning

confidence: 99%

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Single particle flame-combustion studies on solid biomass fuels

Mason

Darvell

Jones

et al. 2015

Fuel

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Combustion of solid biomass in large scale power generation has been recognized as a key technology for the transition to a decarbonized electricity sector in the UK by 2050. Much of the near-term forecast capacity is likely to be by the conversion of existing coal-fired pulverized fuel plant [1]. In such applications, it will be necessary to ensure that the combustion behaviour of the solid biomass fuels is engineered to match, as far as practical, that of the original plant design. While biomass feedstock characteristics vary considerably, one controllable variable for pulverized fuel is the size of the particles.Useful modelling for adaptation and design of boiler plant can be improved with more detailed measurement of the real behaviour of individual particles of the varying fuels. Typical power plant biomass fuels including pine, eucalyptus and willow with particle sizes ranging from up to 3mm [2] and with differing moisture content and aspect ratios were selected for study. Single particles were supported in a water-cooled cover and then exposed above a flame, simulating biomass combustion in a furnace.Measurements of ignition delay, volatile burning time and char burn-out time were undertaken using high speed image capture. Temperatures of the surrounding environment and near to the particle surface were measured with thermocouples and thermometric imaging. Thermo-gravimetric measurements on 2 separate samples complement the single particle measurements as a means of verifying the demarcation between the different stages of combustion and providing kinetic data.Analysis of the data identified correlations between the biomass fundamental characteristics, particle size, and the observed combustion profiles. Empirical expressions for the duration of each combustion stage have been derived. These have been validated with basic modelling including the predicted devolatilisation stage calculated by the FG-Biomass model [3].

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Section: Combustion Apparatusmentioning

confidence: 99%

“…furnace. However there have been a number of experimental methods documented which examine combustion behaviour of biomass particle dimensions in the order of 1mm [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Single particle flame-combustion studies on solid biomass fuels

Mason

Darvell

Jones

et al. 2015

Fuel

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“…sphericity, symmetry and aspect ratio) by using one of the discussed techniques. Various biomass shapes result in different volume-to-surface area ratios which determine heat and mass transfer [44,9]. A spherical particle, as commonly used in literature [45], has a higher volume to surface area ratio than a cylindrical particle of the same volume.…”

Section: Discussionmentioning

confidence: 99%

One way of representing the size and shape of biomass particles in combustion modeling

Trubetskaya

Beckmann²,

Wadenbäck

et al. 2017

Fuel

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a b s t r a c tThis study aims to provide a geometrical description of biomass particles that can be used in combustion models. The particle size of wood and herbaceous biomass was compared using light microscope, 2D dynamic imaging, laser diffraction, sieve analysis and focused beam reflectance measurement. The results from light microscope and 2D dynamic imaging analysis were compared and it showed that the data on particle width, measured by these two techniques, were identical. Indeed, 2D dynamic imaging was found to be the most convenient particle characterization method, providing information on both the shape and the external surface area. Importantly, a way to quantify all three dimensions of biomass particles has been established. It was recommended to represent a biomass particle in combustion models as an infinite cylinder with the volume-to-surface ratio (V/A) measured using 2D dynamic imaging.

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“…Momeni et al [10] conducted the experiments for a combustion process of a single biomass particle in a combustion chamber. Their results showed that the particle combustion process is influenced by the shape and the size of the particle (the particle aspect ratio), the oxygen concentration and the temperature.…”

Section: Residence Timementioning

confidence: 99%

Effect of initial tangential intensity on the fluid dynamic characteristics in tangential burner

Budhi

Bindar

2017

MATEC Web Conf.

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Abstract. Swirl turbulent flow is intensively used by the industrial equipments such as combustion, separation and heat transfer equipments. The fluid dynamic characteristics of this flow are influenced by the chamber's geometries and the operating conditions. One of the important operating condition variables which greatly affects the fluid dynamic characteristics is initial tangential intensity (ITI) or often known as swirl number. This study is aimed to quantify the effect of the initial tangential intensity on the fluid dynamic characteristics in a tangential burner. The method of the study is based on the computational fluid dynamic simulation under the Ansys Fluent CFD engine. The fluid dynamic characteristics were modeled using the standard k-H turbulent model. The simulation results exhibited that the three dimensional flow structure in a tangential burner is dominated by the tangential flow. The fluid dynamic simulations also showed that the effect of the ITI on the mean turbulence intensity and the mean residence time begin to be significant at the ITI values ≥ 1.1 and ≥ 4.5 respectively, while at low ITI values, its effects on both variables are insignificant. The lowest pressure drop obtained in this study was found on the burner with ITI value of 3.2.

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Experimental Study on Effects of Particle Shape and Operating Conditions on Combustion Characteristics of Single Biomass Particles

Cited by 73 publications

References 23 publications

Single particle flame-combustion studies on solid biomass fuels

Single particle flame-combustion studies on solid biomass fuels

One way of representing the size and shape of biomass particles in combustion modeling

Effect of initial tangential intensity on the fluid dynamic characteristics in tangential burner

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