Effect of thermal pretreatment on equilibrium moisture content of lignocellulosic biomass

Acharjee, Tapas C.; Coronella, Charles J.; Vásquez, Victor R.

doi:10.1016/j.biortech.2011.01.018

Cited by 210 publications

(98 citation statements)

References 14 publications

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“…Though, moisture adds some benefits in biological conversion methods, it remains as one of the major obstacles for thermochemical conversion. A modest amount of moisture, however, shows some benefits in the gasification process in which the steam produced from the moisture assists in increasing the hydrogen concentration in the producer gas (Acharjee et al, 2011). At the same time, higher moisture also decreases the overall gasification temperature, resulting in a lower gasification efficiency and higher tar formation.…”

Section: Shortcomings Of Biomass As Energy Sourcementioning

confidence: 99%

“…The torrefaction of biomass destructs the tenacity and fibrous structure of the biomass, and also increases its energy density. Numerous studies concluded that the torrefied biomass can avoid many limitations associated with the raw biomass because it produces moisture free hydrophobic solid products (Acharjee et al, 2011), decreases O/C ratio , reduces grinding energy (Repellin et al, 2010;Phanphanich and Mani, 2011), enhances energy density (Yan et al, 2009), increases bulk density and simplifies storage and transportation (Bergman, 2005;Phanphanich and Mani, 2011), improves particle size distribution (Phanphanich and Mani, 2011), intensifies combustion with less smoke (Pentananunt et al,1990), shifts combustion zone to the high temperature zone in a gasifier (Ge et al, 2013), and increases the resistance to the biological decay (Chaouch et al, 2010). Many of these improvements make the torrefied biomass more suitable than the raw biomass for co-firing in the conventional coal power plants, with minor modifications (Clausen et al, 2010).…”

Section: Motivations For Torrefactionmentioning

confidence: 99%

“…Lowering the EMC reduces the moisture absorbing capacity, and thereby increases the hydrophobicity of biomass. The equilibrium moisture content also depends on the chemical composition and functional groups of biomass (Acharjee et al, 2011). The EMC highly varies with the relative humidity of air.…”

Section: Hydrophobicitymentioning

confidence: 99%

See 2 more Smart Citations

A Comprehensive Review on Biomass Torrefaction

Nhuchhen¹,

Basu²,

Acharya³

2014

IJREB

170

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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Section: Shortcomings Of Biomass As Energy Sourcementioning

confidence: 99%

Section: Motivations For Torrefactionmentioning

confidence: 99%

See 1 more Smart Citation

A Comprehensive Review on Biomass Torrefaction

Nhuchhen¹,

Basu²,

Acharya³

2014

IJREB

170

143

View full text Add to dashboard Cite

show abstract

“…28−30 However, there have been only a few studies that investigated water adsorption properties of torrefied biomass. 21,31 The objective of this work was to assess the hydrophobic nature of thermally treated biomass. Therefore, water adsorption characteristics of raw and torrefied corn stover were determined experimentally at four temperatures and five relative humidity levels.…”

Section: Introductionmentioning

confidence: 99%

Effect of Torrefaction on Water Vapor Adsorption Properties and Resistance to Microbial Degradation of Corn Stover

et al. 2012

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The equilibrium moisture content (EMC) of biomass affects transportation, storage, downstream feedstock processing, and the overall economy of biorenewables production. Torrefaction is a thermochemical process conducted in the temperature regime between 200 and 300 °C under an inert atmosphere that, among other benefits, aims to reduce the innate hydrophilicity and susceptibility to microbial degradation of biomass. The objective of this study was to examine water sorption properties of torrefied corn stover. The EMC of raw corn stover, along with corn stover thermally pretreated at three temperatures, was measured using the static gravimetric method at equilibrium relative humidity (ERH) and temperatures ranging from 10 to 98% and from 10 to 40 °C, respectively. Five isotherms were fitted to the experimental data to obtain the prediction equation that best describes the relationship between the ERH and the EMC of lignocellulosic biomass. Microbial degradation of the samples was tested at 97% ERH and 30 °C. Fiber analyses were conducted on all samples. In general, torrefied biomass showed an EMC lower than that of raw biomass, which implied an increase in hydrophobicity. The modified Oswin model performed best in describing the correlation between ERH and EMC. Corn stover torrefied at 250 and 300 °C had negligible dry matter mass loss due to microbial degradation. Fiber analysis showed a significant decrease in hemicellulose content with the increase in pretreatment temperature, which might be the reason for the hydrophobic nature of the torrefied biomass. The outcomes of this work can be used for torrefaction process optimization, and decision-making regarding raw and torrefied biomass storage and downstream processing. ABSTRACT:The equilibrium moisture content (EMC) of biomass affects transportation, storage, downstream feedstock processing, and the overall economy of biorenewables production. Torrefaction is a thermochemical process conducted in the temperature regime between 200 and 300°C under an inert atmosphere that, among other benefits, aims to reduce the innate hydrophilicity and susceptibility to microbial degradation of biomass. The objective of this study was to examine water sorption properties of torrefied corn stover. The EMC of raw corn stover, along with corn stover thermally pretreated at three temperatures, was measured using the static gravimetric method at equilibrium relative humidity (ERH) and temperatures ranging from 10 to 98% and from 10 to 40°C, respectively. Five isotherms were fitted to the experimental data to obtain the prediction equation that best describes the relationship between the ERH and the EMC of lignocellulosic biomass. Microbial degradation of the samples was tested at 97% ERH and 30°C. Fiber analyses were conducted on all samples. In general, torrefied biomass showed an EMC lower than that of raw biomass, which implied an increase in hydrophobicity. The modified Oswin model performed best in describing the correlation between ERH and EMC. Corn stover torrefi...

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“…Os modelos matemáticos obtidos na literatura e representativos da higroscopicidade de produtos agrícolas, utilizados neste trabalho, foram escolhidos em função da avaliação da temperatura e umidade relativa do ambiente, para a verificação do que melhor se ajusta à realidade empírica do produto, de maneira a melhor representar sua isoterma (QIAOFANG et al, 2013;BABETTO et al, 2011;LI et al, 2011;ACHARJEE et al, 2011;LAM et al, 2012;BROOKER et al, 1992). Os modelos utilizados estão presentes na Tabela 1.…”

Section: Methodsunclassified

Determinação do equilíbrio higroscópico e do calor isostérico do bagaço de cana-de-açúcar

Teixeira¹,

Andrade²,

Espíndola³

et al. 2015

Eng. Agríc.

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RESUMO:Com o intuito de analisar a dinâmica de sorção e a energia necessária para a vaporização da água na desidratação do bagaço da cana-de-açúcar, o presente trabalho teve como objetivo a determinação de seu equilíbrio higroscópico e calor isostérico, a partir de diferentes condições controladas de temperatura (20; 40; 55 e 70 ºC) e umidade relativa do ar (10; 12; 17; 18; 30; 40; 45; 50; 60 e 85%), assim como avaliar, entre diversos modelos descritos na literatura, o que melhor represente o comportamento de sorção. Como resultado, foi verificado que o modelo que melhor se ajustou aos dados empíricos do processo de sorção do bagaço de cana-de-açúcar foi o Modelo de Henderson Modificado, com coeficiente de determinação de 0,972, enquanto o calor isostérico integral de dessorção variou de 2524,09 a 2951,95 kJ kg -1 , para os teores de água de equilíbrio de 0,014 a 0,170 b.s., respectivamente. PALAVRAS-CHAVE:bagaço de cana-de-açúcar; equilíbrio higroscópico; calor isostérico. HYGROCOPIC EQUILIBRIUM AND ISOSTERIC HEAT OF SUGARCANE BAGASSABSTRACT: This study aimed to determine the hygroscopic equilibrium and isosteric heat of sugarcane bagasse to evaluate sorption dynamics and the required energy to vaporize water in the bagasse dehydration. The reaction was assessed at different controlled conditions of temperature (20, 40, 55 and 70 ºC) and air relative humidity (10, 12, 17, 18, 30, 40, 45, 50, 60 and 85%), as well as testing various models described in the literature to identify the condition that better represents sorption behavior. As a result, we found that the model that best fit empirical data of sugarcane bagasse sorption was the modified Henderson with determination coefficient of 0.972; while the integral isosteric heat of desorption ranged from 2,524.09 to 2,951.95 kJ kg -1 , for all water contents and equilibrium of 0.014 until 0.170 bs, respectively.

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Effect of thermal pretreatment on equilibrium moisture content of lignocellulosic biomass

Cited by 210 publications

References 14 publications

A Comprehensive Review on Biomass Torrefaction

A Comprehensive Review on Biomass Torrefaction

Effect of Torrefaction on Water Vapor Adsorption Properties and Resistance to Microbial Degradation of Corn Stover

Determinação do equilíbrio higroscópico e do calor isostérico do bagaço de cana-de-açúcar

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