Models for Fractionation of Field Peas to Supplement Corn Ethanol

Ethanol production capacity in the midwestern United States is rapidly expanding. In order to meet this new capacity, other feedstocks such as field peas, are being considered. Recent studies have shown that pea starch can directly supplement the corn ethanol process. Engineering computer models for four progressively complex pea processing scenarios to supplement a corn ethanol plant are discussed. The complexity of the processes modeled ranges from basic cleaning and destoning to cleaning, destoning, dehulling, drying, and double-pass milling and air classification. Flow rates and compositions are quantified throughout the steps of the processes. The scenarios reported here are specific to 10% supplementation (final ethanol product contributed from peas) of a 380 × 106 L/y (100 MGY) corn ethanol facility, but the models can be readily adapted to other user inputs. Results from the models at default settings return required pea feedstock rates of 16,700 to 17,800 kg/h (36,800 to 39,200 lb/h). Co-product stream flows are also quantified. This information enables the user to evaluate the extent of pea processing that might be a feasible means for ethanol production supplementation and aid in capital investment and operating cost estimates. Access to these models is available at www.ageng.ndsu.nodak.edu/fieldpea/.