Quantification of the torrefaction effects on the grindability and the hygroscopicity of wood chips

Colin, Baptiste; Dirion, Jean-Louis; Arlabosse, Patricia; Salvador, Sylvain

doi:10.1016/j.fuel.2017.02.028

Cited by 70 publications

(39 citation statements)

References 23 publications

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“…Similar to spruce waste grinding, it is required to set the optimal moisture content of pine waste to be ground. Considering the value of the coeffi cient a 1 from the formula (16), the minimum ratio (14) and the optimum moisture content of the pine waste to be ground is W OPT = 27%. At optimum moisture content follows the equation, which describe the specifi c energy consumption [MJ/kg] required for grinding pine barking waste: Thus, grinding the pine barking waste at optimum moisture content by 5-15 times requires energy comprising 7-14% of the heating value.…”

Section: )mentioning

confidence: 99%

“…Regardless of the feedstock type, the grinding of forest materials is an important aspect of the industrial appli-cation [15]. Since wood grinding is one of the most important and the most energy-intensive operations in the bark waste cycle, the main challenge for increasing the effi ciency of this process is to minimize energy consumption [16,17]. One of the key quality parameters of ground feedstock is the particle size, refi nement of which increases the bulk density and surface area of particles [18,19].…”

Section: Introductionmentioning

confidence: 99%

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Reducing energy consumption of barkwood residue grinding on equipment with knife-based operational units

Kunickaya¹,

Zhuk²,

Nikiforova³

et al. 2020

J Appl Eng Science

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In the coming decades, wood waste management for biofuel production is regarded as a promising renewable energy source and a key factor in reducing carbon dioxide emissions. Mechanical grinding is seen as one of the main techniques in wood waste pre-treatment operations that increases the value of feedstock used for fuel. The application potential of the ground product highly depends on the energy effi ciency of the process.This work aimed to establish a consistent pattern for estimating the energy consumption required for grinding spruce and pine barking waste depending on the degree to which materials are ground and their relative moisture content. The energy consumption parameters at grinding were analyzed employing three grinding energy models of Rittinger, Kripichev-Kik, and Bond. The results of estimation showed that specifi c energy consumption is associated with relative moisture content and the grinding degree by nonlinear dependence according to the Kripichev-Kik grinding model for spruce and pine bark. It has been established that the specifi c energy consumptionat grinding spruce and pine barking waste at the optimum humidity of 25% and 27%, respectively, is proportional to the natural logarithm of the grinding degree. It was concluded that the wood waste grinding by 5-15 times requires higher energy consumption at optimum moisture content, which is 5-10% and 7-14% of the heating value for spruce and pine, respectively. The knowledge acquired through this research will contribute to developing possible approaches for wood waste recycling in a more energy-effi cient way.

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Section: )mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reducing energy consumption of barkwood residue grinding on equipment with knife-based operational units

Kunickaya¹,

Zhuk²,

Nikiforova³

et al. 2020

J Appl Eng Science

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“…Even in Japan, a number of large pulverized-coal-fired power plants have incorporated biomass co-firing to reduce CO 2 emissions. However, compared to coal, WB has a remarkably poor grindability [2] and low calorific value. Therefore, to increase the biomass co-firing ratio in existing pulverized coal boilers, biomass modifications via pre-treatment are required.…”

Section: Introductionmentioning

confidence: 99%

Expedient Prediction of the Fuel Properties of Carbonized Woody Biomass Based on Hue Angle

et al. 2018

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Woody biomass co-firing-based power generation can reduce CO 2 emissions from pulverized coal boilers. Carbonization of woody biomass increases its calorific value and grindability, thereby improving the co-firing ratio. Carbonized biomass fuel properties depend on moisture, size and shape of feedstock, and carbonization conditions. To produce carbonized biomass with stable fuel properties, the carbonization conditions should be set according to the desired fuel properties. Therefore, we examined color changes accompanying woody biomass carbonization and proposed using them for rapid evaluation of fuel properties. Three types of woody biomasses were carbonized at a test facility with a capacity of 4 tons/day, and the fuel properties of the obtained materials were correlated with their color defined by the L * a * b * model. When fixed carbon, an important fuel property for carbonization, was 25 wt % or less, we observed a strong negative correlation, regardless of the tree species, between the hue angle, h ab , and fixed carbon. The h ab and fixed carbon were correlated even when the fixed carbon exceeded 25 wt %; however, this correlation was specific to the tree species. These results indicate that carbonized biomass fuel properties such as fixed carbon can be estimated rapidly and easily by measuring h ab .

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“…In accordance with the advantages of torrefaction, a number of researches have been carried out to identify the potential of various lignocellulosic biomass as a source of raw material for the torrefaction process [5,6,[8][9][10][16][17][18][19]. In addition, the effects of reaction temperature, residence time, feedstock type and particle size on the structure, energy density, mass/energy yield, calorific value, chemical composition, grindability, and hygroscopicity of torrefied biomass have been extensively investigated [8,9,[20][21][22][23][24][25][26][27][28]. Other than the researches, several studies have also been implemented to examine the applicability of agricultural residues (rape stalk, wheat and rice straw) by torrefaction treatment [4,29].…”

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confidence: 99%

Effect of Torrefaction Temperature on Lignin Distribution of Larix kaempferiC. and Liriodendron tulipiferaL. Cubes and the Impact of Binder on Durability of Pellets Fabricated with the Torrefied Cubes

Park

Lee

et al. 2019

Env Prog and Sustain Energy

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Larch (LAR) and yellow poplar (YP) cubes were torrefied at 180, 220 and 260°C for 50 min to investigate the effect of torrefaction temperature on chemical composition, fuel properties and pelletability. When increasing the torrefaction temperature from 180 to 220°C, lignin content of torrefied LAR and YP increased from 28 to 34% and from 21 to 23%, respectively. Xylose contents of LAR and YP decreased to 11% at the torefaction temperature of 260°C. The thermal degradation of xylose by the torrefaction treatment has a significant impact on increasing the ash content, higher heating value and weight loss of the torrefied LAR and YP. When the lignin distribution of untreated and 180°C‐torrefied cubes were measured quantitatively by the microscopic analysis of SEM–EDX, the amount of lignin existing on the radial‐sectional areas of LAR and YP increased from 7.89 to 18.84% and from 6.37 to 17.71%, respectively. Durability of pellets fabricated with torrefied LAR and YP cubes decreased with the increase of torrefaction temperature. By the adjustment of a moisture content for the torrefied particles, durability of torrefied LAR pellets improved by 8–11% but that of YP decreased by 2–21%. Addition of 2 wt% starch, lignin and protein as a binder to 180°C‐ and 220°C‐torrefied LAR and YP affected the increase of pellets durability. Accordingly, it can be concluded that the addition of binder or moisture is needed to produce durable pellets made with torrefied LAR and YP while accounting for costs associated with the binders. © 2019 American Institute of Chemical Engineers Environ Prog, 38:e13146, 2019

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Quantification of the torrefaction effects on the grindability and the hygroscopicity of wood chips

Cited by 70 publications

References 23 publications

Reducing energy consumption of barkwood residue grinding on equipment with knife-based operational units

Reducing energy consumption of barkwood residue grinding on equipment with knife-based operational units

Expedient Prediction of the Fuel Properties of Carbonized Woody Biomass Based on Hue Angle

Effect of Torrefaction Temperature on Lignin Distribution of Larix kaempferiC. and Liriodendron tulipiferaL. Cubes and the Impact of Binder on Durability of Pellets Fabricated with the Torrefied Cubes

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