Corn Grain Drying Using Corn Stover Combustion and CHP Systems

dc.contributor.author Bennett, Albert
dc.contributor.author Bern, Carl
dc.contributor.author Bern, Carl
dc.contributor.author Richard, Thomas
dc.contributor.author Anex, Robert
dc.contributor.department Agricultural and Biosystems Engineering
dc.date 2018-02-13T22:53:48.000
dc.date.accessioned 2020-06-29T22:40:07Z
dc.date.available 2020-06-29T22:40:07Z
dc.date.copyright Mon Jan 01 00:00:00 UTC 2007
dc.date.embargo 2014-03-14
dc.date.issued 2007-01-01
dc.description.abstract <p>Post-harvest drying of shelled corn grain requires large amounts of fossil fuel energy. In 2004, it was estimated that the upper Midwest consumed more than $1.4 billion of fossil fuels to dry $19.7 billion of corn grain. Over the long term, drying corn with fossil fuels may become cost prohibitive due to limited fuel reserves. To address future energy concerns for grain dryers, this study evaluated the potential use of combined heat and power (CHP) systems that use the combustion of corn stover both to produce heat for drying and to generate electricity for fans, augers, and control components. Net present value (NPV) cost estimates were determined for two continuous-flow dryers: a relatively small on-farm dryer (8.9 Mg h-1), and a larger dryer more common to grain elevators (73 Mg h-1). For each dryer, three levels of assumed stover price were used: $15, $25, and $35 per dry Mg for the small dryer, and $30, $45, and $60 per dry Mg for the larger dryer (includes payments to farmer and off-farm transport costs). Compared to equivalently sized fossil fuel-fired dryers, both the small and large CHP dryers were found to be more economical over the long term. Twenty-year NPV cost savings and breakeven points were estimated to be $63,523 and 14.3 years for the small CHP dryer ($25 Mg-1 stover) and $1,804,482 and 7.5 years for the large dryer ($45 Mg-1 stover). Sharing CHP infrastructure with other processes requiring heat that extend seasonal use can reduce payback periods significantly and provide broader efficiency benefits. Sensitivity analysis found cost savings to be most sensitive to fluctuations in fossil fuel costs, followed by annual use of dryer equipment.</p>
dc.description.comments <p>This article is from <em>Transactions of the ASABE</em> 50 (2007): 2161–2170, doi:<a href="http://dx.doi.org/10.13031/2013.24076" target="_blank">10.13031/2013.24076</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/abe_eng_pubs/473/
dc.identifier.articleid 1742
dc.identifier.contextkey 5339563
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_pubs/473
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/1243
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/abe_eng_pubs/473/2007_BennettAS_CornGrainDrying.pdf|||Sat Jan 15 00:25:38 UTC 2022
dc.source.uri 10.13031/2013.24076
dc.subject.disciplines Agriculture
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.keywords Bioenergy
dc.subject.keywords Biomass
dc.subject.keywords Biorenewable
dc.subject.keywords CHP
dc.subject.keywords Combined heat and power
dc.subject.keywords Continuous grain driers
dc.subject.keywords Corn drying
dc.subject.keywords Cost analysis
dc.subject.keywords Steam
dc.subject.keywords Stover
dc.title Corn Grain Drying Using Corn Stover Combustion and CHP Systems
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication cbd58252-88a0-4555-b546-3613f558583e
relation.isOrgUnitOfPublication 8eb24241-0d92-4baf-ae75-08f716d30801
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