Size Reduction Characteristics of Yellow Poplar in a Laboratory Knife Mill

Lee, Hyoung-Woo

doi:10.5658/wood.2016.44.2.166

Cited by 3 publications

(2 citation statements)

References 5 publications

(2 reference statements)

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“…The anatomical properties of domestic yellow poplar has been studied (Lee and Eom, 2011;Lee, 2016). Kang et al (2011) measured gas permeability in order to investigate the relationship between the sound absorption characteristics, permeability and pore structure of the cross-section of domestic Yellow poplar.…”

Section: Introductionmentioning

confidence: 99%

Pore Characterization in Cross Section of Yellow Poplar (Liriodendron tulipifera) Wood

Jang¹,

Kang²,

Jang³

2019

Journal of the Korean Wood Science and Technology

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This study was conducted to analyze the pore structure of Yellow poplar. Cross-sectional surfaces of heartwood and sapwood of Yellow poplar (Liriodendron tulipifera) were observed by SEM, and the true density of the heartwood, intermediate wood and sapwood were measured by gas pycnometery, while gas permeability and pore size of heartwood, intermediate wood and sapwood were measured by capillary flow porometery. The pores were classified as through pore, blind pore and closed pore.It was determined that the permeability was increased due to the content and size of through pore being increased although the total porosity of specimen showed slight difference from pith to bark. The content of through pore porosity was 33.754 % of heartwood and 47.810 % of sapwood, showed an increasing trend from pith to bark, however, those for the blind pore porosity and closed pore porosity were 27.890 % and 19.492 % for heartwood and 19.447 % and 4.660 % for sapwood, showed a decreasing trend from pith to bark.The max pore size of specimens was increased by about 5 times from 5.927 μm to 31.334 μm, and mean flow pore size was increased by about 315 times from 0.397 μm to 12.437 μm from pith to bark.

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Section: Introductionmentioning

confidence: 99%

Pore Characterization in Cross Section of Yellow Poplar (Liriodendron tulipifera) Wood

Jang¹,

Kang²,

Jang³

2019

Journal of the Korean Wood Science and Technology

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“…The quality of the grinding product is most often determined by the grinding degree, which is defined as the ratio of the characteristic dimensions of the particles before and after size reduction [19,20]. Other indicators, e.g., bulk density, grain size distribution, specific surface area, energy value, and their relationship with the comminution process, are also important from the point of view of the final product quality [4,[21][22][23][24]. Previous studies conducted by other researchers have shown that the reduction of biomass particles' sizes result in improved flowability and movement properties; the material moves better, e.g., on feeders [25].…”

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confidence: 99%

The Integrated Energy Consumption Index for Energy Biomass Grinding Technology Assessment

et al. 2020

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The assessment of engineering objects in terms of energy consumption is an important part of sustainable development. Many materials, including those from the energy sector, need to undergo earlier processing, e.g., grinding. Grinding processes still demand a significant amount of energy, whereas current energy assessment methods do not take into account important parameters of the process, which makes it difficult to choose their optimal values. The study presents the analysis, testing, and assessment of mechanical engineering systems in terms of the energy consumption involved in the grinding of biomass intended for energy production purposes. A testing methodology was developed to improve the parameters of multi-disc grinding, including the reduction of energy consumption, power input, product quality improvement, and process efficiency. An original model of integrated energy consumption was developed. Tests were carried out on a five-disc grinder for five programs to assess the programmable angular speeds of the grinder discs. Output values, including specific energy demand, fragmentation degree, and integrated energy consumption, were assigned to each testing program. The test results were subjected to statistical analysis. Based on the authors' own research, it was found that the angular speed of the discs and, consequently, the linear speed of the grinding blades, have a significant influence on the values of the integrated energy consumption of the preliminary process.Acquiring energy from biomass requires its earlier preparation: drying, grinding, palletizing, etc. [7]. These procedures require certain energy inputs (costs) which significantly decrease the energy and environmental balance in the entire lifecycle of the energy material (wood, grain biomass, etc.) [8][9][10][11][12][13]. According to the idea of sustainable development concerning the design of systems, devices, and processes, in three areas-the environment, society, and economy-the biomass processing lines should be characterized by the lowest possible energy consumption and environmental impact [14,15]. It also aims to improve the competitiveness of biomass fuels in relation to conventional fossil fuels [16,17].Before being used for energy purposes, energy media need to be properly prepared, e.g., their dimensions need to be reduced by means of grinding [2]. Roller, drum, ball, hammer, and disc mills are used to grind granular biomaterials (biomass grains) [7,18]. Tests have shown that the best relations between product quality, yield, and grinding energy consumption occur for hammer and disc mills [2,7]. The quality of the grinding product is most often determined by the grinding degree, which is defined as the ratio of the characteristic dimensions of the particles before and after size reduction [19,20]. Other indicators, e.g., bulk density, grain size distribution, specific surface area, energy value, and their relationship with the comminution process, are also important from the point of view of the final product quality [4,[21][22]...

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Study on the Size Reduction Characteristics of Miscanthus sacchariflorus via Image Processing

Lee¹,

Lee²,

Gong³

et al. 2018

Journal of the Korean Wood Science and Technology

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Hyoung-Woo Lee 2, † ⋅Jae-Won Lee 2 ⋅Sung-Ho Gong 3 ⋅Yeon-Sang Song 4 ABSTRACT1 )Size reduction is an important pre-processing operation for utilizing biomass as a sustainable resource in industrial-scale energy production and as a raw material for other industries. This work investigates the size reduction characteristics of air-dried Miscanthus sacchariflorus Goedae-Uksae 1 (Amur silver grass) via image processing and identifies the morphological characteristics of comminuted and screened M. sacchariflorus. At chopping lengths of 18, 40, 80, and 160 mm, 81%, 77%, 78%, and 76% of the particles, respectively, passed through a 4-mm sieve. Even a knife mill with a very small screen aperture (>1 mm) admitted over 10% of the particles. The average circularity and aspect ratio of the particles were <0.30 and >10, respectively. These results confirm that in all preparation modes, most M. sacchariflorus particles were needle-like in shape, irrespective of the type of preparation.

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Size Reduction Characteristics of Yellow Poplar in a Laboratory Knife Mill

Cited by 3 publications

References 5 publications

Pore Characterization in Cross Section of Yellow Poplar (Liriodendron tulipifera) Wood

Pore Characterization in Cross Section of Yellow Poplar (Liriodendron tulipifera) Wood

The Integrated Energy Consumption Index for Energy Biomass Grinding Technology Assessment

Study on the Size Reduction Characteristics of Miscanthus sacchariflorus via Image Processing

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