Studies on pyrolysis of a single biomass cylindrical pellet—kinetic and heat transfer effects

Jalan, R.K.; Srivastava, Vaibhav

doi:10.1016/s0196-8904(98)00099-5

Cited by 117 publications

(44 citation statements)

References 12 publications

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“…Melaaen and Gronli (1997) presented models on moist wood drying andpyrolysis. Jalan and Srivastava (1999) explored kinetic and heat transfer effects on the pyrolysis of a single biomass cylindrical pellet. Ravi (2003) proposed a semi-emperical model for pyrolysis of sawdust in an annular packed bed using pseudo-first order reaction for the chemical reaction of the pyrolysis.…”

Section: Introductionmentioning

confidence: 99%

Analytical Investigations of Kinetic and Heat Transfer in Slow Pyrolysis of a Biomass Particle

Ojolo

Osheku

Sobamowo

2013

Int. J. Renew. Energy Dev.

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ABSTRACT:The utilization of biomass for heat and power generation has aroused the interest of most researchers especially those of energy .In converting solid fuel to a usable form of energy, pyrolysis plays an integral role. Understanding this very important phenomenon in the thermochemical conversion processes and representing it with appropriate mathematical models is vital in the design of pyrolysis reactors and biomass gasifiers. Therefore, this study presents analytical solutions to the kinetic and the heat transfer equations that describe the slow pyrolysis of a biomass particle. The effects of Biot number, temperature and residence time on biomass particle decomposition were studied. The results from the proposed analytical models are in good agreement with the reported experimental results. The developed analytical solutions to the heat transfer equations which have been stated to be "analytically involved" showed average percentage error and standard deviations 0.439 and 0.103 from the experimental results respectively as compared with previous model in literature which gives average percentage error and standard deviations 0.75 and 0.106 from the experimental results respectively. This work is of great importance in the design of some pyrolysis reactors/units and in the optimal design of the biomass gasifiers.

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Section: Introductionmentioning

confidence: 99%

Analytical Investigations of Kinetic and Heat Transfer in Slow Pyrolysis of a Biomass Particle

Ojolo

Osheku

Sobamowo

2013

Int. J. Renew. Energy Dev.

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“…Therefore, it is important to discuss the effect of intra-partcle heat transfer on pyrolysis. Although researchers have investigated the effect of heat transfer during biomass pyrolysis (5)(6)(7) , numerical and experimental information available about the effect of heating rate on intra-particle transport phenomena is insufficient.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Investigation of Intra-Particle Heat Transfer and Tar Decomposition during Pyrolysis of Wood Biomass

Okekunle

Pattanotai

Watanabe

et al. 2011

JTST

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Pyrolysis of cylindrical woody biomass has been investigated both numerically and experimentally with emphasis on intra-particle heat transfer and tar decompostion. In experiment, wood cylinder of 8 mm diameter and 9 mm length was pyrolyzed in an infrared reactor exposed to both convective and radiative heat fluxes in argon environment. The final reactor temperature was 973 K, and heating rate was 5, 10 and 30 K/s. Three K-type thermocouples were located in the sample to measure intra-particle temperature history. The weight fraction history and intra-particle temperature profiles were measured at different runs. Tar was obtained at a cold trap. In calculation, a two-dimensional, unsteady state single particle model was developed and used to simulate the pyrolysis process. Wood cylinder was modeled as an isotropic porous solid. Solid mass conservation equations were solved by using first-order Euler Implicit Method. Gas phase mass conservation equations and energy conservation equation were discretised by finite volume method. In order to investigate the effect of intra-particle heat transfer, simulations were carried out, first, by considering temperature gradient and second, by assuming uniform temperature within the sample. When temperature gradient was considered, simulation results were in good agreement with experimental data. When uniform intra-particle temperature was used in the simulation, simulation results were quite different from experimental measurements, the degree of difference increasing with increase in heating rate. Both calculation and experiment showed tar yield decreased with increasing heating rate. This was because tar formation reaction and intra-particle tar decomposition reactions were enhanced by increase in heating rate but the latter was dominant. It was shown that intra-particle heat transfer and tar decomposition played an important role in pyrolysis characteristics of wood cylinder.

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“…During the thermal decomposition process, there are several phenomena related to the external and internal heat and mass transfer. When a particle of solid sample is exposed to high temperature operation, external heat is transmitted to the particle surface by radiation and/or convection and/or conduction, and then heat conduction takes place in the biomass particle from the surface to the inside of the particle [69][70][71]. The three combined mechanisms of heat transmission inside the pyrolysing solid are the conduction through the solid particle, the radiation from the pore walls and the heat transmission through the gas phase (volatile and gaseous products) inside the particle pores [9,23,65].…”

Section: Influence Of Experimental Conditionsmentioning

confidence: 99%

“…This profile depends on the chemical reaction heat, sample size, heat conductivity and heating rate [7,71]. The poor heat conduction of biomass leads to the temperature difference between the surface and inside of the particle.…”

Section: Influence Of Experimental Conditionsmentioning

confidence: 99%

Formal Kinetic Parameters – Problems and Solutions in Deriving Proper Values

Phusunti

Hornung

2014

Transformation of Biomass

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Studies on pyrolysis of a single biomass cylindrical pellet—kinetic and heat transfer effects

Cited by 117 publications

References 12 publications

Analytical Investigations of Kinetic and Heat Transfer in Slow Pyrolysis of a Biomass Particle

Analytical Investigations of Kinetic and Heat Transfer in Slow Pyrolysis of a Biomass Particle

Numerical and Experimental Investigation of Intra-Particle Heat Transfer and Tar Decomposition during Pyrolysis of Wood Biomass

Formal Kinetic Parameters – Problems and Solutions in Deriving Proper Values

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