Drying technology for woody biomass for fine grinding by vibration mills

Kobayashi, Jun; Itaya, Yoshinori; Tsukada, S.; Mizuno, K.; Ueda, M.; Morikawa, Hiroshi; Sugimoto, Tomoko; Ueda, Yasuyuki; Oshika, Y.; Kobayashi, Nobusuke; Hatano, Shigenobu; Mori, Shigekatsu

doi:10.1002/apj.46

Cited by 9 publications

(6 citation statements)

References 15 publications

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“…Conventional milling technology like hammer milling is incapable of providing sufficient size reduction to produce a micronized particle [18]. In contrast, micronized wood is commonly prepared using vibratory milling [19,20].…”

Section: Introductionmentioning

confidence: 99%

Characterization of micronized wood and energy-size relationship in wood comminution

Jiang

Wang

Zhang

et al. 2017

Fuel Processing Technology

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Mechanical milling demonstrates potential in the pretreatment arena to valorize lignocellulosic biomass because it eliminates chemicals and simplifies processing. The development of physical properties and energy consumption for generating micronized particles are key factors affecting potential use. This study investigated the effect of input moisture content, and feedstock particle size on developing physical characteristics of micronized particles and the resultant specific energy consumption in the milling process. Wood particles with different sizes were effectively comminuted to less than 20-μm within several minutes using a vibratory ring and puck mill. Moisture content was found to be a key factor influencing the development of particle morphology and crystallinity. Lower moisture content resulted in much rounder particles with lower crystallinity, while higher moisture content resulted in the micronized particles with larger aspect ratio and crystallinity. Crystallinity index and median aspect ratio of the micronized particles were linearly correlated. The particle size change during milling was highly correlated to the specific energy consumption of milling through the Rittinger's model (0.91

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Section: Introductionmentioning

confidence: 99%

Characterization of micronized wood and energy-size relationship in wood comminution

Jiang

Wang

Zhang

et al. 2017

Fuel Processing Technology

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“…The average air velocity was assumed as 0.2 m/s. Ståhl et al [17] dried the sawdust and cutter shavings from Norwegian spruce and Scottish pine at temperatures of 60-82 • C, whereas Kobayashi et al [24] investigated the drying behavior of sawdust and the woody powder at 70 • C. Particles of Norway spruce (20 × 20 × 5 mm 3 ) were dried at two different air temperatures, 70 • C and 120 • C, and at an air velocity of 0.6 m/s [14], while particles (50 × 100 mm 2 ) of the same wood species were dried at 60 and 100 • C and at 2 m/s [21]. Lerman and Wennberg [27] studied the bed drying of woody biomass (Norway spruce wood chips and sawdust).…”

Section: Drying Characteristicsmentioning

confidence: 99%

“…Karlsson et al [23] presented experimental data of hot air drying of bark in a deep bed. Kobayashi et al [24] investigated the drying behavior of wood biomass and the effect of moisture content on fine grinding using a vibration mill. Bengtsson [25] carried out an experimental study on low-temperature bed drying of wooden biomass particles.…”

Section: Introductionmentioning

confidence: 99%

Some Aspects of the Modelling of Thin-Layer Drying of Sawdust

et al. 2021

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Drying of spruce, beech, willow, and alder sawdust was examined in a laboratory type dryer. The effect of drying air temperature T (25, 60, and 80 °C) and airflow velocity v (0.01, 0.15, and 1.5 m/s) was investigated. The obtained results demonstrated that drying air temperature and airflow velocity have impacts on the drying of sawdust. The experimental dehydration data of sawdust obtained were fitted to theoretical, semi-theoretical, and empirical thin-layer models. The accuracies of the models were estimated using the correlation coefficient (R), root mean square error (RMSE), and reduced chi-square (χ2). All models except the theoretical model of a sphere described the drying characteristics of sawdust satisfactorily. The effect of T and v on the parameters (constants and coefficients) of the drying models were determined. The effect, by the proposed equations, was also described. This work combines aspects of mechanical engineering and modelling of the drying process.

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“…Before being supplied to product energy, the biomass materials were pulverized. J. Kobayashi studied the drying process of woody biomass for fine grinding and the drying characteristics [4]. He found that grinding properties of woody biomass depend largely on its moisture content; the drying behavior of woody biomass and the effect of moisture content were also analyzed.…”

Section: Introductionmentioning

confidence: 99%

Pulverizing Characteristic of Woody Biomass by a Kind of Impact Mill

Wu¹,

Gai²,

Yang³

et al. 2015

Advances in Intelligent Systems Research

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To investigate the pulverizing characteristic of wood biomass, the dried woody chip and the wood chip with four different moisture content of 5, 10, 15, 20wt% were chose as the raw materials, a kind of impact mill, the universal mill, was used to pulverize the wood biomass at different feed rates, the particle sizes (characteristic particle size and average particle size), uniformity coefficient, density, aspect ratio of wood powder and the specific energy consumption were measured, the pulverizing mechanism was also discussed. The results indicate that the specific energy consumption is in a range from 100 to 400kWh/t, and decreases with the increasing feed rate without changing of the basic motor power; the characteristic particle size is about 625μm, the average particle size is 470μm or so, and both characteristic particle size and average particle size increase with the increasing feed rate, and then decrease before the feed rate reaches to the maximum capacity of the mill; the uniformity coefficient is range from 1.30 to 1.50; the bulk density is about 0.20g/cm 3 , the tap density is about 0.30g/cm 3 , both bulk density and tap density increase with the increase of the feed rate; the aspect ratio is in a range from 2.45 to 2.90 randomly with a common tendency of declining slightly following the increase of feed rate; the pulverizing mechanism of the biomass is the cross section of breakage.

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Drying technology for woody biomass for fine grinding by vibration mills

Cited by 9 publications

References 15 publications

Characterization of micronized wood and energy-size relationship in wood comminution

Characterization of micronized wood and energy-size relationship in wood comminution

Some Aspects of the Modelling of Thin-Layer Drying of Sawdust

Pulverizing Characteristic of Woody Biomass by a Kind of Impact Mill

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