Characterization of the Impact of Process Variables on the Densification of Corn Stover

dc.contributor.advisor Matthew J. Darr
dc.contributor.author Thoreson, Curtis
dc.contributor.department Agricultural and Biosystems Engineering
dc.date 2018-08-11T07:09:01.000
dc.date.accessioned 2020-06-30T02:34:01Z
dc.date.available 2020-06-30T02:34:01Z
dc.date.copyright Sat Jan 01 00:00:00 UTC 2011
dc.date.embargo 2013-06-05
dc.date.issued 2011-01-01
dc.description.abstract <p>The bulk density of corn stover poses a major obstruction to its large scale viability as a biomass feedstock. Corn stover has a low bulk density which limits transportation and storage containers based on volume rather than weight, creating large inefficiencies during the harvest, transport, and storage phases of corn stover production. Producing a densified stover product during the harvest phase of production could reduce the overall production cost of corn stover.</p> <p>Corn stover can currently be densified by grinding, baling, briquetting, or pelleting methods. Grinding systems do not produce an adequate bulk density to optimize transportation requirements alone, and are often used as a pre-processing operation for other densification systems. Baling can provide an improved bulk density at low energy requirements, but faces a logistical challenge associated with handling individual bales. Pelleting and briquetting systems generally require grinding as an initial process, and provide a high quality densified stover product at low mass flow rates and very high energy requirements. All of these factors drive up the production cost of densified corn stover for each system.</p> <p>This research investigated a densification method that outputs a large, tapered and cylindrical, densified stover product. This research differentiates itself from previous briquetting and pelleting work because these briquettes are produced at field harvested particle sizes and lower compression pressures. While this produces a lower quality and density briquette than traditional briquetting and pelleting processes, the energy requirement is significantly reduced. This type of densified corn stover product could be suitable for in-field single-pass corn stover harvesting systems where the material is harvested and stored until further processing (the densified product is not the final product).</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/etd/11201/
dc.identifier.articleid 2196
dc.identifier.contextkey 2807394
dc.identifier.doi https://doi.org/10.31274/etd-180810-178
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath etd/11201
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/25407
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/etd/11201/Thoreson_iastate_0097M_11688.pdf|||Fri Jan 14 18:45:07 UTC 2022
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.keywords Briquette
dc.subject.keywords Corn
dc.subject.keywords Densification
dc.subject.keywords Density
dc.subject.keywords Pellet
dc.subject.keywords Stover
dc.title Characterization of the Impact of Process Variables on the Densification of Corn Stover
dc.type article
dc.type.genre thesis
dspace.entity.type Publication
relation.isOrgUnitOfPublication 8eb24241-0d92-4baf-ae75-08f716d30801
thesis.degree.level thesis
thesis.degree.name Master of Science
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