Impact of torrefaction on syngas production from wood

Couhert, Carole; Salvador, Sylvain; Commandré, Jean-Michel

doi:10.1016/j.fuel.2009.05.003

Cited by 293 publications

(144 citation statements)

References 10 publications

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“…According to Kuo et al [48] the gasification of raw biomass gives lower CO concentration than torrefied biomass, which is stemming from the lower carbon content of raw biomass. The marginal behaviour of CO 2 concentration at ER = 0.2 is likely due to the water gas shift reaction (R7) being more dominant at this ER [49].…”

Section: Effect Of Bed Reactor Temperature On the Gas Yieldmentioning

confidence: 95%

Kinetics and Performance of Raw and Torrefied Biomass in a Continuous Bubbling Fluidized Bed Gasifier

Al-Farraji

Marsh

Steer

et al. 2017

Waste Biomass Valor

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This paper is an experimental study of the kinetics of gasification of olive kernel by using a thermogravimetric fluidized bed reactor technique. Gasification of 'as received' and torrefied olive kernels were investigated in a lab-scale bubbling fluidized bed gasifier, operating at up to 3.2 kg/h. The effect of bed temperature between 550 and 750 °C in 50 °C increments on the gasification product gas at mass-based equivalence ratios of 0.15 and 0.2 was studied. To explore the potential of torrefied biomass, the gasification results were compared to that of the 'as received' biomass. The product gas from torrefied biomass produced higher H 2 , CO and CH 4 concentrations at identical oxidant flow rates in addition to higher cold gas efficiency and higher product gas heating value. The influence of equivalence ratio in gasification was also investigated at reactor temperatures of 750 °C and five equivalence ratios (0.15, 0.2, 0.25, 0.3, and 0.35). The results revealed that the torrefied biomass has the highest HHV at an equivalence ratio of 0.2 with a value of 6.09 MJ/Nm 3 , while 'as received' biomass 4.72 MJ/Nm 3 . Kinetic experiments under isothermal conditions were performed for the gasification of the materials in continuous mode. A mass balance model was successfully used to provide the capability of separately determining the rate constant of the reactions taking place. The kinetic parameters were calculated by a first order reaction model giving activation energies for 'as received' olive kernels of 84 kJ/mol and for torrefied olive kernels of 106 kJ/mol.

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Section: Effect Of Bed Reactor Temperature On the Gas Yieldmentioning

confidence: 95%

Kinetics and Performance of Raw and Torrefied Biomass in a Continuous Bubbling Fluidized Bed Gasifier

Al-Farraji

Marsh

Steer

et al. 2017

Waste Biomass Valor

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“…This may be due to the higher losses in the volatiles at the higher torrefaction temperature without adding their energy values in the product gas. Couhert et al (2009) also observed a poor performance in the steam gasification at 1200 ºC in a fixed bed reactor of torrefied wood compared with that of the gasification of the normal char. But, the quality of syngas, which is a ratio of sum of H2 and CO to CO2, improves significantly when the torrefied biomass produced at a higher temperature was used as a feedstock.…”

Section: Gasificationmentioning

confidence: 96%

A Comprehensive Review on Biomass Torrefaction

Nhuchhen¹,

Basu²,

Acharya³

2014

IJREB

174

143

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Biomass is a versatile energy resource that could be used as a sustainable energy resource in solid, liquid and gaseous form of energy sources. Torrefaction is an emerging thermal biomass pretreatment method that has an ability to reduce the major limitations of biomass such as heterogeneity, lower bulk density, lower energy density, hygroscopic behavior, and fibrous nature. Torrefaction, aiming to produce high quality solid biomass products, is carried out at 200-300 °C in an inert environment at an atmospheric pressure. The removal of volatiles through different decomposition reactions is the basic principle behind the torrefaction process. Torrefaction upgrades biomass quality and alters the combustion behavior, which can be efficiently used in the co-firing power plant. This paper presents a comprehensive review on torrefaction of biomass and their characteristics. Despite of the number of advantages, torrefaction is motivated mainly for thermochemical conversion process because of its ability to increase hydrophobicity, grindability and energy density of biomass. In addition to this, torrefied biomass could be used to replace coal in the metallurgical process, and promoted as an alternative of charcoal.

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“…Only few studies have dealt with woody biomass pyrolysis in a DTR above 1000°C [3][4][5][6]. Woody biomass gasification has been studied at high temperature (T > 1000°C) in presence of oxygen [4,7,8] and/or in presence of steam [4,7,[9][10][11] or in presence of carbon dioxide [11]. These studies show a high influence of gasification atmosphere both on carbon conversion and on the product gas composition.…”

Section: Introductionmentioning

confidence: 99%

Influence of H 2 O, CO 2 and O 2 addition on biomass gasification in entrained flow reactor conditions: Experiments and modelling

Billaud

Valin

Peyrot

et al. 2016

Fuel

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. Influence of H2O, CO2 and O-2 addition on biomass gasification in entrained flow reactor conditions: Experiments and modelling. Fuel, Elsevier, 2016, 166, pp.166-178. 10 Experiments were modelled with a 1D-model using detailed chemical scheme. Gas, char, tar + soot were satisfactorily simulated in the whole range of conditions. ysis reaction, gas phase reaction with a detailed chemical scheme (176 species, 5988 reactions), char gasification by steam and CO 2 and soot formation. H 2 O or CO addition has no influence on gasification product yields at 800 and 1000 °C, while at 1200 and 1400 °C the char gasification is significantly enhanced and soot formation is certainly inhibited by OH radical which reacts with soot precursors. The modification of output gas phase composition is mostly due to WGS reaction which reaches thermodynamic equilibrium from about 1200 °C. As expected, O 2 has a significant influence on gas and tar yields through combustion reactions. Char and soot yields decrease as ER increases. The GASPAR model allows a good prediction of gas and char and gives relevant evolution of soot and tar yields on the large majority of conditions studied.

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Impact of torrefaction on syngas production from wood

Cited by 293 publications

References 10 publications

Kinetics and Performance of Raw and Torrefied Biomass in a Continuous Bubbling Fluidized Bed Gasifier

Kinetics and Performance of Raw and Torrefied Biomass in a Continuous Bubbling Fluidized Bed Gasifier

A Comprehensive Review on Biomass Torrefaction

Influence of H 2 O, CO 2 and O 2 addition on biomass gasification in entrained flow reactor conditions: Experiments and modelling

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