Modelling and measurements of the pyrolysis of large wood particles

Larfeldt, Jenny

doi:10.1016/s0016-2361(00)00007-7

Cited by 106 publications

(56 citation statements)

References 10 publications

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“…The average value of the specific heat of big bluestem at 420K is 2.46 kJ/kg/K (Table 1), which is in line with the previously reported range of 2.30 to 2.60 kJ/kg/K for wood and grass particle biomasses [28]. Stepwise multiple regression analysis was conducted to relate specific heat to [29], which indicated that the specific heat of biomass increased by 40% and basically followed a linear pattern before 430 K then followed a second-order polynomial for the entire pyrolysis process (Fig 3).…”

Section: Specific Heatsupporting

confidence: 91%

Thermal properties of big bluestem as affected by ecotype and planting location along the precipitation gradient of the Great Plains

Zhang

Johnson

Nelson

et al. 2014

Energy

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The objective of this research was to study the effect of ecotype and planting location on thermal properties of big bluestem. Three big bluestem ecotypes (CKS, EKS, ILL) and a cultivar (KAW) were harvested in 2010 from four locations (Colby, Hays, and Manhattan, KS; and Carbondale, IL) and were evaluated for their specific heat, thermal conductivity, thermal stability, high heating value (HHV), and proximate contents. All populations revealed a large variation in specific heat (2.35-2.62 kJ/kg/K), thermal conductivity (77.85-99.06×10-3 W/m/K), thermogravimetric analysis as weight loss during the heating process (71-73%), and HHV (17.64-18.67 MJ/kg). Specific heat of the big bluestem was significantly affected by planting location, ecotype, and interaction between location and ecotype. Planting location had stronger influence on specific heat than ecotype. Specific heat increased as temperature increased, and a linear correlation model for specific heat prediction was developed as a function of temperature.Ecotype, planting location, and the interaction of ecotype and planting location did not have a significant effect on thermal conductivity; however, density and particle size showed a completely opposite relationship on thermal conductivity. Both planting location and ecotype significantly affected HHV. Among all environmental factors, potential evapotranspiration had the most significant effect on thermal properties.

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Section: Specific Heatsupporting

confidence: 91%

Thermal properties of big bluestem as affected by ecotype and planting location along the precipitation gradient of the Great Plains

Zhang

Johnson

Nelson

et al. 2014

Energy

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“…The initial and boundary conditions are at t ¼ 0; and 0 r r 0 ; T ¼ T 0 (14) for t > 0; at r ¼ 0; @T @r ¼ 0; due to symmetry (15) for t > 0; at…”

Section: Heat Transfer Modelmentioning

confidence: 99%

“…The model used three parameters to account for solid shrinkage, changes in volatile fraction, and changes in wood porosity. Larfeldt et al [13,14] studied the influence of structural changes, heat transfer properties of dry wood and pyrolysis mechanism in large cylindrical samples of dry birch wood particles. They showed that the use of a shrinking model reduced the predicted time of pyrolysis substantially.…”

Section: Introductionmentioning

confidence: 99%

Modelling and experimental studies on pyrolysis of biomass particles

Sadhukhan

Gupta

Saha

2008

Journal of Analytical and Applied Pyrolysis

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“…Many studies have reported on the pyrolysis of mm size particle under inert atmosphere (Haydary et al, 2012;Johansson et al, 2007;Larfeldt et al, 2000;Peters and Bruch, 2003;Sadhukhan et al, 2008). The objective of this study was to investigate the effect of oxygen during oxidative pyrolysis of a thick wood particle.…”

Section: Introductionmentioning

confidence: 99%

Thick wood particle pyrolysis in an oxidative atmosphere

Daouk

Steene

Paviet

et al. 2015

Chemical Engineering Science

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The oxidative pyrolysis was studied in thermally thin and thick regimes. The oxygen has a significant influence on oxidative pyrolysis. The effect of particle size was studied in thermally thick regime conditions. The temperatures inside a particle highlighted the exothermicity of the process. t r a c tOxidative pyrolysis of pine wood particles was analysed thermo-gravimetrically. The effects of the concentration of oxygen in the surrounding gas and of particle size were investigated. Three different oxygen concentrations (0%, 10% and 20% v/v) and three different sized cylindrical pine wood samples (4 mm, 8 mm and 12 mm in diameter and 15 mm long) were tested. Two types of Macro-TG apparatuses were used; the first was non-isothermal and was used at a heating rate of 20 1C/min, and the second was isothermal used at two temperatures, 400 1C and 600 1C. In the low heating rate non-isothermal apparatus, results showed that oxygen had a strong influence on pyrolysis behaviour, but particle size did not. In the high heating rate isothermal apparatus, particle size had a significant influence on conversion: transfer phenomena limit oxidative pyrolysis.

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Modelling and measurements of the pyrolysis of large wood particles

Cited by 106 publications

References 10 publications

Thermal properties of big bluestem as affected by ecotype and planting location along the precipitation gradient of the Great Plains

Thermal properties of big bluestem as affected by ecotype and planting location along the precipitation gradient of the Great Plains

Modelling and experimental studies on pyrolysis of biomass particles

Thick wood particle pyrolysis in an oxidative atmosphere

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