Combustion of wood hydrolysis residue in a 150kW powder burner

Eriksson, G.; Kjellström, Björn; Lundqvist, Björn; Paulrud, Susanne

doi:10.1016/j.fuel.2004.02.012

Cited by 35 publications

(12 citation statements)

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“…Biochemical conversion consists of four main process steps: 1) pretreatment of lignocellulosic biomass, 2) enzymatic hydrolysis of cellulose to glucose, 3) fermentation of glucose towards ethanol production, and 4) ethanol separation and purification 11. The solid residue of such a process consists mainly of lignin, which can be burned as a solid biofuel without further processing for the production of heat or power12 or alternatively it can be used as a raw material in the chemical industry 13. Lignocellulose consists mainly of three biopolymers, the carbohydrates cellulose and hemicellulose, and lignin, which is a phenolic polymer.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Hydrothermal Pretreatment of Lignocellulosic Biomass in the Bioethanol Production Process

2012

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The natural resistance to enzymatic deconstruction exhibited by lignocellulosic materials has designated pretreatment as a key step in the biological conversion of biomass to ethanol. Hydrothermal pretreatment in pure water represents a challenging approach because it is a method with low operational costs and does not involve the use of organic solvents, difficult to handle chemicals, and "external" liquid or solid catalysts. In the present work, a systematic study has been performed to optimize the hydrothermal treatment of lignocellulosic biomass (beech wood) with the aim of maximizing the enzymatic digestibility of cellulose in the treated solids and obtaining a liquid side product that could also be utilized for the production of ethanol or valuable chemicals. Hydrothermal treatment experiments were conducted in a batch-mode, high-pressure reactor under autogeneous pressure at varying temperature (130-220 °C) and time (15-180 min) regimes, and at a liquid-to-solid ratio (LSR) of 15. The intensification of the process was expressed by the severity factor, log R(o). The major changes induced in the solid biomass were the dissolution/removal of hemicellulose to the process liquid and the partial removal and relocation of lignin on the external surface of biomass particles in the form of recondensed droplets. The above structural changes led to a 2.5-fold increase in surface area and total pore volume of the pretreated biomass solids. The enzymatic hydrolysis of cellulose to glucose increased from less than 7 wt% for the parent biomass to as high as 70 wt% for the treated solids. Maximum xylan recovery (60 wt%) in the hydrothermal process liquid was observed at about 80 wt% hemicellulose removal; this was accomplished by moderate treatment severities (log R(o)=3.8-4.1). At higher severities (log R(o)=4.7), xylose degradation products, mainly furfural and formic acid, were the predominant chemicals formed.

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Section: Introductionmentioning

confidence: 99%

Optimization of Hydrothermal Pretreatment of Lignocellulosic Biomass in the Bioethanol Production Process

2012

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“…The finer the particle, the less time it takes to ignite. For fine particles, the moisture evaporates faster and the release of volatile matter starts earlier [14,5].…”

Section: Particle Sizementioning

confidence: 99%

“…secondary and tertiary air. It can be adjusted by the angles of the swirl generator blades and air flow rate through separate air feeding units [13,14,15,17,1,16]. From (7) it can be understood that if in the larger angle the swirl generator blocs are placed and higher air feed is applied, the higher swirl number is reached.…”

Section: Swirl Numbermentioning

confidence: 99%

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A Review on Suspended Wood Dust Combustion. Efficiency and Fuel Quality

Siliņš¹

2012

Scientific Journal of Riga Technical University. Environmental and Climate Technologies

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The paper is dedicated to review the combustion efficiency in low capacity wood dust suspension burners. Fuel quality is reviewed as the main contributor to the combustion efficiency. Wood dust moisture content, particle size and shape, amount of volatiles are discussed as the main contributors. Some additional aspects like burner ignition, fuel and combustion air feeding are reviewed to increase the efficiency. A brief overview of particle combustion process is provided followed by an identification and discussion of combustion efficiency influencing parameters. The significance of fuel feeding and air supply is discussed at the end of the paper.

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“…However, when considering hybrid biochem ical/thermochemical ethanol biorefineries, a lowcost (and, especially, low-tem perature) pretreat ment process that extracts som e hem icellulose with the lignin m ay be beneficial to the overall process efficiency and ethanol product yield in comparison to dilute acid pretreatm ent and other approaches that optim ize biochem ical conversion of cellulose and hem icellulose. In formation on the com bustion, gasification, or pyrolysis behavior of lignin-rich residues from biochem ical conversion processes is virtually non-existent in the literature (see Blunk and Je nkins, 2000;Eriksson et al, 2004;Öhm an et al, 2006;and Li et al, 2008, for the only known exam ples), so work on this project should prove to be a vital source of information for designing appropriate thermochemical conversion devices. …”

Section: Project Structurementioning

confidence: 99%

Development of efficient, integrated cellulosic biorefineries : LDRD final report.

Teh¹,

Hecht²,

Shaddix³

et al. 2010

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Cellulosic ethanol, generated from lignocellulosic biomass sources such as grasses and trees, is a promising alternative to conventional starch-and sugar-based ethanol production in term s of potential production quantities, CO 2 im pact, and econom ic com petitiveness. In addition, cellulosic ethanol can be generated (at least in principle) without com peting with food production. However, approximately 1/3 of the lignocellulosic biomass material (including all of the lignin) cannot be converted to ethanol thr ough biochemical means and m ust be extracted at some point in the biochem ical process. In this project we gathered basic inform ation on the prospects for utilizing this lignin residue m aterial in therm ochemical conversion processes to improve the overall energy efficiency or li quid fuel production capacity of cellulosic biorefineries. Two existing pretreatm ent appr oaches, soaking in aqueous am monia (SAA) and the Arkenol (strong sulfuric acid) process, were im plemented at Sandia and used to generated suitable quantities of residue material from corn stover and eucalyptus feedstocks for subsequent thermochemical research. A third, novel technique , using ionic liquids (IL) was investigated by Sandia researchers at the Joint Bioenergy Institute (JBEI), but was not successf ul in isolating sufficient lignin residue. Additional residue m aterial for therm ochemical research was supplied from the dilute-acid sim ultaneous saccharification/fermentation (SSF) pilot-scale process at the National Renewable Energy Laboratory (NREL). Th e high-tem perature volatiles yields of the different residues were m easured, as were the char com bustion reactivities. The residue chars showed slightly lower reactivity than raw biom ass char, except for the SSF residue, which had substantially lower reactivity. Exergy analysis was applied to the NREL standard process design model for therm ochemical ethanol production a nd from a prototypical dedicated biochem ical process, with process data supplied by a r ecent report from the National Research Council (NRC). The therm ochemical system analysis reveal ed that m ost of the system inefficiency is associated with the gasification process and subs equent tar reform ing step. For the biochem ical process, the steam generation from residue co mbustion, providing the requisite heating for the conventional pretreatment and alcohol distillati on processes, was shown to dom inate the exergy loss. An overall energy balance with dif ferent potential distillation energy requirem ents shows that as much as 30% of the biom ass energy content may be available in the f uture as a feedstock for thermochemical production of liquid fuels. 3This page left intentionally blank.

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Combustion of wood hydrolysis residue in a 150kW powder burner

Cited by 35 publications

References 1 publication

Optimization of Hydrothermal Pretreatment of Lignocellulosic Biomass in the Bioethanol Production Process

Optimization of Hydrothermal Pretreatment of Lignocellulosic Biomass in the Bioethanol Production Process

A Review on Suspended Wood Dust Combustion. Efficiency and Fuel Quality

Development of efficient, integrated cellulosic biorefineries : LDRD final report.

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