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

Trubetskaya, Anna; Beckmann, Gert; Wadenbäck, Johan; Holm, Jesper; Velaga, Sitaram P.; Weber, Roman

doi:10.1016/j.fuel.2017.06.052

Cited by 49 publications

(21 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous studies have shown that an increased transport distance from 50 to 100 km has mainly an effect on the economics, whereas the effect on total energy consumption and GHG emissions was small [66]. Loose biomass, such as forest residues or straw can be mechanically densified to improve transport efficiency [104,105]. Wood or forestry residues can also be used as a transportation biofuel to reduce GHG emissions by up to ≈45-75% [106,107].…”

Section: Transportmentioning

confidence: 99%

“…In addition, renewable reductants may require more energy for handling and transport. For example, the milling of biomass requires more energy than that of coal samples [16], which will affect the overall energy demand in the pretreatment process. A systematic effort is needed to overcome technical and economical hurdles to realize a shift from fossil fuel-based to renewable reductants [17].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Life Cycle Assessment of Renewable Reductants in the Ferromanganese Alloy Production: A Review

2021

Self Cite

View full text Add to dashboard Cite

This study examined the literature on life cycle assessment on the ferromanganese alloy production route. The environmental impacts of raw material acquisition through the production of carbon reductants to the production of ferromanganese alloys were examined and compared. The transition from the current fossil fuel-based production to a more sustainable production route was reviewed. Besides the environmental impact, policy and socioeconomic impacts were considered due to evaluation course of differences in the production routes. Charcoal has the potential to substantially replace fossil fuel reductants in the upcoming decades. The environmental impact from current ferromanganese alloy production can be reduced by ≥20% by the charcoal produced in slow pyrolysis kilns, which can be further reduced by ≥50% for a sustainable production in high-efficient retorts. Certificated biomass can ensure a sustainable growth to avoid deforestation and acidification of the environment. Although greenhouse gas emissions from transport are low for the ferromanganese alloy production, they may increase due to the low bulk density of charcoal and the decentralized production of biomass. However, centralized charcoal retorts can provide additional by-products or biofuel and ensure better product quality for the industrial application. Further upgrading of charcoal can finally result in a CO2 neutral ferromanganese alloy production for the renewable power supply.

show abstract

Section: Transportmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Life Cycle Assessment of Renewable Reductants in the Ferromanganese Alloy Production: A Review

2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…Where fn,I and fi are the numerical and mass fractions, respectively, of the i-th size bin, i.e. with di being its characteristic diameter [23,24]. The fi is basically the one reported in Figure 4.…”

Section: Fuel Characteristicsmentioning

confidence: 99%

Woodchip size effect on combustion temperatures and volatiles in a small-scale fixed bed biomass boiler

et al. 2020

View full text Add to dashboard Cite

Biomass combustion performance is greatly affected by the particle size distribution, which influences heat and mass transport phenomena. The present work investigates the effect of woodchip size distribution on combustion in a 140kW underfeed stoker boiler. Three different fuel sizes were prepared, and their combustion performance was measured by monitoring temperatures inside and above the fire pit and the gas composition above the fuel bed. The gas composition was then correlated to the particle mean diameter. Although minor effects could be detected in the temperature and composition of the flue gases, a more uniform spatial distribution of volatiles was observed when employing bigger woodchips. The present results can improve the understanding of the impact of fuel size on the performance of woodchip-fired boilers and can be valuably used for numerical model validation.

show abstract

“…Where Femax is the maximum Feret diameter (longest distance between two parallel tangents of the particle at any arbitrary angle) or maximum caliper diameter. Trubetskaya et al [36] showed that Femax is suitable to represent the length of particles. The circularity (C), which is also a measure of the particle roundness [37], indicates how closely the particle resembles a circle:…”

Section: Pellet Milling Behaviormentioning

confidence: 99%

“…Momeni [11] and Trubetskaya et al [36]. With 2D image analysis lacking the third dimension, Trubetskaya et al [36] analyzed the thickness of wood pellets comminuted in a roller mill at Avedøre power plant. For particles with a width below 0.85 mm, the thickness was found to be about 0.6 times the particle width.…”

Section: Milling Behavior Of I1 and I2 Pelletsmentioning

confidence: 99%

Wood pellet milling tests in a suspension-fired power plant

Masche

Puig-Arnavat

Wadenbäck

et al. 2018

Fuel Processing Technology

Self Cite

View full text Add to dashboard Cite

This paper investigates the milling behavior of two industrial wood pellet qualities (designated I1 and I2 as per ISO 17225-2:2014) in large-scale coal roller mills, each equipped with a dynamic classifier. The purpose of the study was to test if pellet comminution and subsequent particle classification (i.e., the classifier cut size) are affected by the internal pellet particle size distribution obtained after pellet disintegration in hot water. Furthermore, optimal conditions for comminuting pellets were identified. The milling behavior was assessed by determining the specific grinding energy consumption and the differential mill pressure. The size and shape of comminuted pellets sampled from burner pipes were analyzed by dynamic image analysis and sieve analysis, respectively. The results showed that the internal pellet particle size distribution affected both the milling behavior and the classifier cut size. I2 pellets with coarser internal particles than I1 pellets required more energy for milling, led to a higher mill pressure drop and showed a larger classifier cut size. Comminuted pellet particles sampled from burner pipes were notably Masche et al. / Wood Pellet Milling Tests in a Suspension-Fired Power Plant / 2 finer than internal pellet (feed) particles. At similar mill-classifier conditions, characteristic particle sizes of 0.50 mm for comminuted I1 pellets (compared to 0.83 mm for material within I1 pellets) and of 0.56 mm for comminuted I2 pellets (compared to 1.09 mm for material within I2 pellets), respectively, were obtained. Pellet comminution at lower mill loads and lower primary airflow rates reduced the mill power consumption, the mill pressure drop, and the classifier cut size. However, this was at the expense of a higher specific grinding energy consumption. Derived 2D shape parameters for comminuted and internal pellet particles were similar. Mill operating changes had a negligible effect on the original elongated wood particle shape. To achieve the desired comminuted product fineness (i.e., the classifier cut size) with lower specific grinding energy consumption, power plant operators need to choose pellets with a finer internal particle size distribution.

show abstract

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

Cited by 49 publications

References 37 publications

Life Cycle Assessment of Renewable Reductants in the Ferromanganese Alloy Production: A Review

Life Cycle Assessment of Renewable Reductants in the Ferromanganese Alloy Production: A Review

Woodchip size effect on combustion temperatures and volatiles in a small-scale fixed bed biomass boiler

Wood pellet milling tests in a suspension-fired power plant

Contact Info

Product

Resources

About