Kinetics of Primary Product Formation from Wood Pyrolysis

and, Colomba Di Blasi; Branca, Carmen

doi:10.1021/ie000997e

Cited by 246 publications

(134 citation statements)

References 47 publications

Supporting

Mentioning

122

Contrasting

Order By: Relevance

“…They showed that higher reaction temperature (800 to 1000°C) led to lower yields of tars and higher yields of gaseous products. In addition, pyrolysis of smaller particles (0.5 to 1 mm) improved the char reactivity for combustion or gasification [20]. Results found by Guerrero et al [1] showed that the reactivity to oxygen of the char produced by eucalyptus pyrolysis increases with the heating rate of biomass particles.…”

Section: Introductionmentioning

confidence: 93%

Pyrolysis of wood at high temperature: The influence of experimental parameters on gaseous products

Commandré

Lahmidi

Salvador

et al. 2011

Fuel Processing Technology

View full text Add to dashboard Cite

The pyrolysis of wood was carried out in an Entrained Flow Reactor at high temperature (650 to 950°C) and under rapid heating conditions (N 10 3 K s − 1 ). The influence of the diameter and initial moisture of the particle, reactor temperature, residence time and the nature of the gaseous atmosphere on the composition of the gaseous products has been characterised. Particle size, between 80-125 and 160-200 μm, did not show any impact. Pyrolysis and tar cracking essentially happen in very short time period: less than 0.6 s; the products yields are only slightly modified after 0.6 s in the short residence times (several seconds) of our experiments. Higher temperatures improve hydrogen yield in the gaseous product while CO yield decreases. Under nitrogen atmosphere, after 2 s at 950°C, 76% (daf) of the mass of wood is recovered as gases: CO, CO 2 , H 2 , CH 4 , C 2 H 2 , C 2 H 4 and H 2 O. Tests performed under steam partial pressure showed that hydrogen production is slightly enhanced.

show abstract

Section: Introductionmentioning

confidence: 93%

Pyrolysis of wood at high temperature: The influence of experimental parameters on gaseous products

Commandré

Lahmidi

Salvador

et al. 2011

Fuel Processing Technology

View full text Add to dashboard Cite

show abstract

“…At present, many simplified reaction mechanisms exist for the study of biomass pyrolysis. These are either one-step global models (15)(16)(17)(18)(19) or one-or two-stage multiple reaction models (20,(21)(22)(23)(24)(25)(26) . Di Blasi (27) and Prakash and Karunanithi (28) have given some comprehensive reviews of advances in modeling and simulation of chemical and physical processes of wood and biomass pyrolysis.…”

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

View full text Add to dashboard Cite

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.

show abstract

“…Fixed bed reactors have been used in some experiments, and they can process from 10 to 500 g of material (Deng et al 2009;Kim et al 2012;Oliveira and Rousset 2009;Prins et al 2006b). Finally, fluidized systems have been designed to study the thermal kinetic decomposition of wood by Barooah and Long (1976), Di Blasi and Branca (2001), and Peng et al (2012). Barooah and Long (1976) presented results for the rates of thermal decomposition of beech sawdust in a fluidized reactor, using heated sand to raise the biomass temperature.…”

Section: Introductionmentioning

confidence: 99%

“…They obtained a kinetic model of a first-order reaction for temperatures ranging between 250 and 330 °C; when they increased the temperature over 330 °C, a second-order kinetic model was found to be consistent with the data. Di Blasi and Branca (2001) published a study on the kinetic parameters for beech decomposition in a fluidized reactor at higher temperatures (between 300 and 435 °C). The main results indicated that a one-step global reaction is capable of adequately modeling the torrefaction process.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Torrefaction Kinetics of Red Oak (Quercus rubra) in a Fluidized Reactor

Carrasco¹,

Oporto²,

Zondlo³

et al. 2013

BioResources

View full text Add to dashboard Cite

a Different kinetic models have been proposed to characterize torrefaction of biomass, demonstrating dependencies on the raw material, experimental system, reaction time, and temperature. Conventionally, stationary processes have been used for kinetics studies of the torrefaction process. In this research, the torrefaction of red oak (Quercus rubra) in a bench-scale fluidized reactor was studied with emphasis on determining the kinetic parameters and improving the final material energy density. Mass loss and ultimate, proximate, and gross calorific analyses were performed on the resulting torrefied material. The primary reaction variables were the temperature (230 °C, 270 °C, 300 °C, and 330 °C) and the residence time (10 min, 20 min, and 30 min). The effect of temperature on the mass loss and energy density was much more significant than that produced by the increase in residence time. For the conditions studied, a one-step kinetic model with a firstorder reaction proved adequate to describe the torrefaction of red oak in the fluidized reactor. The reaction rate constant (k) for the torrefaction reaction was found to be 0.212 min -1 at 300 °C. The activation energy and frequency factor were 11.9 kJ/mol and 2.57 min -1 , respectively.

show abstract

Kinetics of Primary Product Formation from Wood Pyrolysis

Cited by 246 publications

References 47 publications

Pyrolysis of wood at high temperature: The influence of experimental parameters on gaseous products

Pyrolysis of wood at high temperature: The influence of experimental parameters on gaseous products

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

Torrefaction Kinetics of Red Oak (Quercus rubra) in a Fluidized Reactor

Contact Info

Product

Resources

About