Single-particle biomass pyrolysis: correlations of reaction products with process conditions

Chan, W. C.; Kelbon, Marcia; Krieger-Brockett, Barbara

doi:10.1021/ie00084a012

Cited by 87 publications

(57 citation statements)

References 23 publications

(35 reference statements)

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“…This is because, when the biomass particle size increases, the distance from the biomass particle's surface to its centre increases, which delays the heat transfer rate from the hot material to cold biomass. Therefore, the bio-oil yield decreases [22]. Figure 2.…”

Section: Pyrolysis Processmentioning

confidence: 99%

Characterization of Bio-Oil From Palm Kernel Shell Pyrolysis

Hamidin

Ali²,

Abidin³

et al. 2014

J MECH ENG SCI

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Pyrolysis of palm kernel shell in a fixed-bed reactor was studied in this paper. The objectives were to investigate the effect of pyrolysis temperature and particle size on the products yield and to characterize the bio-oil product. In order to get the optimum pyrolysis parameters on bio-oil yield, temperatures of 350, 400, 450, 500 and 550 °C and particle sizes of 212-300 µm, 300-600 µm, 600µm-1.18 mm and 1.18-2.36 mm under a heating rate of 50 °C min -1 were investigated. The maximum bio-oil yield was 38.40% at 450 °C with a heating rate of 50 °C min -1 and a nitrogen sweep gas flow rate of 50 ml min -1 . The bio-oil products were analysed by Fourier transform infra-red spectroscopy (FTIR) and gas chromatography-mass spectroscopy (GCMS). The FTIR analysis showed that the bio-oil was dominated by oxygenated species. The phenol, phenol, 2-methoxy-and furfural that were identified by GCMS analysis are highly suitable for extraction from the bio-oil as value-added chemicals. The highly oxygenated oils need to be upgraded in order to be used in other applications such as transportation fuels.

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Section: Pyrolysis Processmentioning

confidence: 99%

Characterization of Bio-Oil From Palm Kernel Shell Pyrolysis

Hamidin

Ali²,

Abidin³

et al. 2014

J MECH ENG SCI

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“…The shrinkage of biomass in pyrolysis has also been studied both experimentally [25,26] and numerically [27][28][29][30]. The results have shown that both primary and secondary reaction paths are affected by the shrinkage of the char layer, and larger tar yields are predicted for shrinking particles.…”

Section: Introductionmentioning

confidence: 99%

CFD modelling of the fast pyrolysis of biomass in fluidised bed reactors: Modelling the impact of biomass shrinkage

Papadikis

Bridgwater

2009

Chemical Engineering Journal

116

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a b s t r a c tThe fluid-particle interaction and the impact of shrinkage on pyrolysis of biomass inside a 150 g/h fluidised bed reactor is modelled. Two 500 m in diameter biomass particles are injected into the fluidised bed with different shrinkage conditions. The two different conditions consist of (1) shrinkage equal to the volume left by the solid devolatilization, and (2) shrinkage parameters equal to approximately half of particle volume. The effect of shrinkage is analysed in terms of heat and momentum transfer as well as product yields, pyrolysis time and particle size considering spherical geometries. The Eulerian approach is used to model the bubbling behaviour of the sand, which is treated as a continuum. Heat transfer from the bubbling bed to the discrete biomass particle, as well as biomass reaction kinetics are modelled according to the literature. The particle motion inside the reactor is computed using drag laws, dependent on the local volume fraction of each phase. FLUENT 6.2 has been used as the modelling framework of the simulations with the whole pyrolysis model incorporated in the form of user defined function (UDF).

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“…Thermal conductivity across and tangential to the grain direction is approximately one third that along the grain [8]. Also, the permeability to gas flow across the wood grain is much lower than that along the other two directions [8] (up to a factor of lo4). To study the effects of wood anisotropy on the thermal degradation, different properties along the x and y directions are assigned.…”

Section: Mathematical Formulation Of the Problemmentioning

confidence: 90%

“…From the physical point of view, the model here presented describes the transport phenomena occurring through the cross section of a wooden sample exposed in a pre-heated, inert atmosphere furnace. Wood is an anisotropic material with different properties along, cross and tangential to the grain [8]. Thermal conductivity across and tangential to the grain direction is approximately one third that along the grain [8].…”

Section: Mathematical Formulation Of the Problemmentioning

confidence: 99%

“…Wood is an anisotropic material with different properties along, cross and tangential to the grain [8]. Thermal conductivity across and tangential to the grain direction is approximately one third that along the grain [8]. Also, the permeability to gas flow across the wood grain is much lower than that along the other two directions [8] (up to a factor of lo4).…”

Section: Mathematical Formulation Of the Problemmentioning

confidence: 99%

See 1 more Smart Citation

On The Influence Of Physical Processes On The Transient Pyrolysis Of Cellulosic Samples

Diblasi¹

1994

Fire Safety Science - Proceedings of the Fourth International S

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A two-dimensional, variable property, mathematical model of the transient pyrolysis of dry cellulosic materials, in response to prescribed conditions in a furnace, is presented. Chemical processes account for a reduction in the degree of polymerization of the solid and two competing pathways leading, respectively, to a solid charred residual (char) and low molecular weight gaseous species (gas) and to condensable organic components (tar). Volatile pyrolysis products flow towards both the cold solid and the hot char, with pressure and velocity variations described according to the Darcy law. Radiative, convective and conductive heat transfer interior to the solid and convective and radiative heat losses from the surfaces are also modeled. The pyrolysis of large samples is a wave-like process, controlled by heat transfer for a wide range of heating conditions (furnace temperatures from 600K to 1200K) and affected by the grain structure of the solid. Volatile pyrolysis products flow mainly along the solid grain, carrying thermal energy out from the sample. The total heat transferred to the solid is initially larger along this direction, because of the larger thermal conductivities. However, for long times, the total heat convected out almost equals the total heat conducted in. Larger temperatures along the char layer and a faster advancement of the pyrolysis front are predicted for the cross grain direction. Most of the pyrolysis products are tars with increasing char yields as reaction temperatures are lowered through variations in the sample heating conditions.

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Single-particle biomass pyrolysis: correlations of reaction products with process conditions

Cited by 87 publications

References 23 publications

Characterization of Bio-Oil From Palm Kernel Shell Pyrolysis

Characterization of Bio-Oil From Palm Kernel Shell Pyrolysis

CFD modelling of the fast pyrolysis of biomass in fluidised bed reactors: Modelling the impact of biomass shrinkage

On The Influence Of Physical Processes On The Transient Pyrolysis Of Cellulosic Samples

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