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ARS Home » Plains Area » Brookings, South Dakota » Integrated Cropping Systems Research » Research » Publications at this Location » Publication #255288

Title: Modeling of DDGS Flowability With Varying Drying and Storage Parameters

Author
item BHADRA, RUMELA - South Dakota State University
item Rosentrater, Kurt
item MUTHUKUMARAPPAN, K - South Dakota State University

Submitted to: Meeting Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 6/15/2010
Publication Date: 6/20/2010
Citation: Bhadra, R., Rosentrater, K.A., Muthukumarappan, K. 2010. Modeling of DDGS Flowability With Varying Drying and Storage Parameters. 2010 ASABE Annual International Meeting, Pittsburgh PA, June 20-23, 2010.

Interpretive Summary: DDGS particles in hoppers and other storage structures are typical during transportation. The current study deals with DDGS prepared by combining condensed distillers solubles (CDS) with distiller’s wet grains (DWG) and then drying at varying temperatures. The prepared DDGS was stored in conical hoppers under varying ambient temperature, consolidation pressure, and time conditions. We investigated the effects of CDS (10, 15, and 20% wb), drying temperature (100, 200, and 300°C), drying time (20, 40, 60 min) cooling temperature (0, 25, 50°C), consolidation pressure (0, 2.1, 3.1), and consolidation time (0, 3, 6 days) levels on various flow properties. Taguchi’s experimental design with L-18 orthogonal array was implemented for statistical analyses of the data. Response surface modeling yielded Mass Flow Rate = f(HR, AoR) with R2= 0.99, and ranges of predicted moisture content for “good”, “fair” and “poor” flow. Additionally, the Johanson model for predicted Mass Flow Rate was calibrated with experimental data.

Technical Abstract: It has been forecasted that 2010 ethanol production will reach over13 billion gallons, and this is going to increase as the Renewable Fuels Standards mandates the production of 15 billion gallons by 2015. With the continued growth of the ethanol industry, there is enormous expansion in distillers grains (DDGS) production. Since the local market for DDGS is often saturated, it has become essential to transport DDGS long distances across US and even in international markets. Caking and agglomeration of DDGS particles in hoppers and other storage structures are typical during transportation. The current study deals with DDGS prepared by combining condensed distillers solubles (CDS) with distiller’s wet grains (DWG) and then drying at varying temperatures. The prepared DDGS was stored in conical hoppers under varying ambient temperature, consolidation pressure, and time conditions. We investigated the effects of CDS (10, 15, and 20% wb), drying temperature (100, 200, and 300°C), drying time (20, 40, 60 min) cooling temperature (0, 25, 50°C), consolidation pressure (0, 2.1, 3.1), and consolidation time (0, 3, 6 days) levels on various flow properties. Taguchi’s experimental design with L-18 orthogonal array was implemented for statistical analyses of the data. Response surface modeling yielded Mass Flow Rate = f(HR, AoR) with R2= 0.99, and ranges of predicted moisture content for “good”, “fair” and “poor” flow. Additionally, the Johanson model for predicted Mass Flow Rate was calibrated with experimental data.