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

Thoreson, Curtis Peder

doi:10.31274/etd-180810-178

Cited by 2 publications

(4 citation statements)

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“…A customized, bench-scale densification system was developed to conduct the experiments ( Figure 1) [8]. This experimental briquetting system produced large cylindrical briquettes with a base diameter of 127 mm and a height of 200 mm.…”

Section: Briquette Densification Bench Development and Basic Operationmentioning

confidence: 99%

“…Harvesting systems that can increase cob content would be advantageous to this type of densification system. Further extrapolation of these advantages can be found in Thoreson [8].…”

Section: Summary Of Key Findingsmentioning

confidence: 99%

“…Additionally, this paper presents a blended densification system which combines the best features of various existing densification systems including a minimal requirement for size reduction and preprocessing found in baling systems as well as a bulk flowable final product which is similar to traditional high density pellets. This paper explores how various process variables impact briquette characteristics; a discussion of the energy component may be found in Thoreson [8].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Process Variables in the Densification of Corn Stover Briquettes

et al. 2014

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Abstract:The bulk density of raw corn stover is a major limitation to its large-scale viability as a biomass feedstock. Raw corn stover has a bulk density of 50 kg/m 3 , which creates significant transportation costs and limits the optimization of transport logistics. Producing a densified corn stover product during harvest would reduce harvest and transportation costs, resulting in viable pathways for the use of corn stover as a biomass feedstock. This research investigated the effect of different process variables (compression pressure, moisture content, particle size, and material composition) on a densification method that produces briquettes from raw corn stover. A customized bench-scale densification system was designed to evaluate different corn stover inputs. Quality briquette production was possible using non-reduced particle sizes and low compression pressures achievable in a continuous in-field production system. At optimized bench settings, corn stover was densified to a dry bulk density of 190 kg/m 3 . Corn stover with a moisture content above 25% wb was not suitable for this method of bulk densification, and greater cob content had a positive effect on product quality.

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Section: Briquette Densification Bench Development and Basic Operationmentioning

confidence: 99%

“…Harvesting systems that can increase cob content would be advantageous to this type of densification system. Further extrapolation of these advantages can be found in Thoreson [8].…”

Section: Summary Of Key Findingsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of Process Variables in the Densification of Corn Stover Briquettes

et al. 2014

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“…Keywords. Corn stover, Corn cob, Densification, Durability, Briquette. new method of densification was developed which resulted in large agricultural residue briquettes (Thoreson, 2011). The densification system produced corn stover briquettes at low compression pressures (14 MPa) and coarse particle sizes (30-50 mm particle length).…”

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confidence: 99%

Technical Note: Durability Analysis of Large Corn Stover Briquettes

Thoreson¹,

Webster²,

Darr³

2012

Applied Engineering in Agriculture

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Densification of agricultural residues is a key step in a cost-effective, large-scale, biomass feedstock supply system. Lab-scale densification systems exist which can produce large-scale densified corn stover briquettes that measure between 220 and 420 mm in length and with an average bulk density of 190 kg/m3 (dry particle density of 460 kg/m3). MOG (material other than grain) and pure cob briquettes produced similar lengths and dry particle densities of 424 kg/m3 and 421 kg/m3, respectively. Durability testing, utilizing a modified form of ASABE S269.4 (ASABE Standards, 2007) was conducted to determine the overall product quality associated with these densified briquettes. This publication describes experiments which quantified the durability or briquettes produced with different material types (corn stover, MOG, the chaff from a conventional corn harvest, and pure cobs) and material particle sizes (produced from a combine chopper, MOG, and a hammer mill with a 19-mm screen opening size). The durability rating varied with each of the main effect test parameters and produced a maximum 46% durability rating using pure cobs directly from a combine without additional size reduction. The durability rating was quite low for corn stover and MOG briquettes, and it was improved for pure cob briquettes. Biomass preprocessing in a hammermill significantly reduced durability due to a lack of fiber interaction throughout the large briquette.

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

Cited by 2 publications

References 10 publications

Investigation of Process Variables in the Densification of Corn Stover Briquettes

Investigation of Process Variables in the Densification of Corn Stover Briquettes

Technical Note: Durability Analysis of Large Corn Stover Briquettes

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