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Experimental and modeling investigations of biomass particle combustion /Lu, Hong, January 2006 (has links) (PDF)
Thesis (Ph. D.)--Brigham Young University. Dept. of Chemical Engineering, 2006. / Includes bibliographical references (p. 175-181).
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Biomass thermochemical gasification experimental studies and modeling /Kumar, Ajay. January 2009 (has links)
Thesis (Ph.D.)--University of Nebraska-Lincoln, 2009. / Title from title screen (site viewed October 13, 2009). PDF text: xiv, 183 p. : ill. (some col.) ; 1 Mb. UMI publication number: AAT 3358961. Includes bibliographical references. Also available in microfilm and microfiche formats.
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An exergy-based analysis of gasification and oxyburn processesDudgeon, Ryan James. Chen, L-D, January 2009 (has links)
Thesis (M.S.)--University of Iowa, 2009. / Thesis supervisor: Lea-Der Chen. Includes bibliographical references (leaves 110-114).
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Synthesis, characterization, and applications of redox-mediated ion exchangersFeazell, Monica N. Chambliss, C. Kevin. January 2007 (has links)
Thesis (Ph.D.)--Baylor University, 2007. / In abstract "5, 2, 9, 8, 12, 25, and 3" are subscript. In abstract "5 and 2 are superscript. Includes bibliographical references (p. 180-187).
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Composition related effects on thermal reactivity of organic feedstocks /Rodriguez, Indalesio, January 1996 (has links)
Thesis (Ph. D.)--University of Washington, 1996. / Vita. Includes bibliographical references (leaves [149]-161).
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SOLVOLYSIS OF BIOMASS AT ELEVATED TEMPERATURES.Ghoddoussi Moghaddam, Mohammad. January 1984 (has links)
No description available.
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The silviculture, nutrition and economics of short rotation willow coppice in the uplands of mid-WalesHeaton, Rebecca Jane January 2000 (has links)
No description available.
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Kinetics of DCOD Consumption by Bacterial SuspensionsPoliszuk, Shirley 17 December 2004 (has links)
The aim of this investigation was to study the kinetics of readily biodegradable soluble substrate, and the interactions between the bioflocculation process and such kinetics. Several batch test experiments were performed at different soluble-substratebiomass ratios in order to evaluate its impact on the kinetics and the order of the reaction. Similarly the consumption of dissolved substrate was compared using two different bacterial suspensions: (1) flocculated suspension; and (2) dispersed cells suspensions. In this research flocculated biomass from a complete mixed activated sludge (CMAS) system was tested using sequencing batch reactors (SBR). Results indicate that when the So/Xo ratio is low (below 0.3) the removal of readily biodegradable soluble substrate can be well described by first-order kinetics with an asymptotic non-biodegradable portion for both flocculated and dispersed cells suspensions. However, it was found that the dissolved COD consumption for freely dispersed cells proceeds at a faster rate than for flocculated suspensions.
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Developing a fundamental understanding of biomass structural features responsible for enzymatic digestibilityO'Dwyer, Jonathan Patrick 30 October 2006 (has links)
Lignocellulosic biomass is one of the most valuable alternative energy sources
because it is renewable, widely available, and environmentally friendly. Unfortunately,
enzymatic hydrolysis of biomass has been shown to be a limiting factor in the
conversion of biomass to chemicals and fuels. This limitation is due to inherent
structural features (i.e., acetyl content, lignin content, crystallinity, surface area, particle
size, and pore volume) of biomass. These structural features are barriers that prevent
complete hydrolysis; therefore, pretreatment techniques are necessary to render biomass
highly digestible.
The ability to predict the biomass reactivity based solely on its structural features
would be of monumental importance. Unfortunately, no study to date can predict with
certainty the digestibility of pretreated biomass. A concerted effort with Auburn
University and Michigan State University has been undertaken to study hydrolysis
mechanisms on a fundamental level. Predicting enzymatic hydrolysis based solely on
structural features (lignin content, acetyl content, and crystallinity index) would be a
major breakthrough in understanding enzymatic digestibility.
It was proposed to develop a fundamental understanding of the structural features
that affect the enzymatic reactivity of biomass. The effects of acetyl content,
crystallinity index (CrI), and lignin content on the digestibility of biomass (i.e., poplar
wood, bagasse, corn stover, and rice straw) were explored.
In this fundamental study, 147 poplar wood model samples with a broad
spectrum of acetyl content, CrI, and lignin were subjected to enzymatic hydrolysis to
determine digestibility. Correlations between acetyl, lignin, and CrI and linear hydrolysis profiles were developed with a neural network model in Matlabî. The
average difference between experimentally measured and network-predicted data were
ñ12%, ñ18%, and ñ27% for 1-, 6-, and 72-h total sugar conversions, respectively. The
neural network models that included cellulose crystallinity as an independent variable
performed better compared to networks with biomass crystallinity, thereby indicating
that cellulose crystallinity is more effective at predicting enzymatic hydrolysis than
biomass crystallinity. Additionally, including glucan slope in the 6-h and 72-h xylan
slope networks and glucan intercept in the 6-h and 72-h xylan intercept networks
improved their predictive ability, thereby suggesting glucan removal affects later-stage
xylan digestibility.
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An analysis of producing ethanol and electric power from woody residues and agricultural crops in East TexasIsmayilova, Rubaba Mammad 17 September 2007 (has links)
The increasing U.S. dependence on imported oil; the contribution of fossil fuels to the
greenhouse gas emissions and the climate change issue; the current level of energy
prices and other environmental concerns have increased world interest in renewable
energy sources. Biomass is a large, diverse, readily exploitable resource. This
dissertation examines the biomass potential in Eastern Texas by examining a 44 county
region. This examination considers the potential establishment of a 100-megawatt (MW)
power plant and a 20 million gallon per year (MMGY) ethanol plant using
lignocellulosic biomass. The biomass sources considered are switchgrass, sugarcane
bagasse, and logging residues. In the case of electricity generation, co-firing scenarios
are also investigated. The research analyzes the key indicators involved with economic
costs and benefits, environmental and social impacts. The bioenergy production
possibilities considered here were biofeedstock supported electric power and cellulosic
ethanol production. The results were integrated into a comprehensive set of information
that addresses the effects of biomass energy development in the region. The analysis indicates that none of the counties in East Texas have sufficient
biomass to individually sustain either a 100% biomass fired power plant or the cellulosic
ethanol plant. Such plants would only be feasible at the regional level. Co-firing
biomass with coal, however, does provide a most attractive alternative for the study
region. The results indicate further that basing the decision solely on economics of
feedstock availability and costs would suggest that bioenergy, as a renewable energy, is
not a viable energy alternative. Accounting for some environmental and social benefits
accruing to the region from bioenergy production together with the feedstock economics,
however, suggests that government subsidies, up to the amount of accruing benefits,
could make the bioenergies an attractive business opportunity for local farmers and
investors.
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