Machine Learning Reduced Order Model for Cost and Emission Assessment of a Pyrolysis SystemClick to copy article linkArticle link copied!
- Olumide OlafasakinOlumide OlafasakinDepartment of Mechanical Engineering, Iowa State University, Ames, Iowa 50010, United StatesMore by Olumide Olafasakin
- Yahan ChangYahan ChangDepartment of Mechanical Engineering, Iowa State University, Ames, Iowa 50010, United StatesMore by Yahan Chang
- Alberto PassalacquaAlberto PassalacquaDepartment of Mechanical Engineering, Iowa State University, Ames, Iowa 50010, United StatesMore by Alberto Passalacqua
- Shankar SubramaniamShankar SubramaniamDepartment of Mechanical Engineering, Iowa State University, Ames, Iowa 50010, United StatesMore by Shankar Subramaniam
- Robert C. BrownRobert C. BrownDepartment of Mechanical Engineering and Bioeconomy Institute, Iowa State University, Ames, Iowa 50010, United StatesMore by Robert C. Brown
- Mark Mba Wright*Mark Mba Wright*Email: [email protected]. Tel: 515-294-0913.Department of Mechanical Engineering and Bioeconomy Institute, Iowa State University, Ames, Iowa 50010, United StatesMore by Mark Mba Wright
Abstract

Biomass pyrolysis is a promising approach for producing economic and environmentally friendly fuels and bioproducts. Biomass pyrolysis experiments show that feedstock properties have a significant impact on product yields and composition. Scientists are developing detailed chemical reaction mechanisms to capture the relationships between biomass composition and pyrolysis yields. These mechanisms can be computationally intensive. In this study, we investigate the use of a machine learning reduced order model (ROM) for assessing the costs and emissions of a pyrolysis biorefinery. We developed a Kriging-based ROM to predict pyrolysis yields of 314 feedstock samples based on the results of a detailed chemical kinetic pyrolysis mechanism. The ROM is integrated into a chemical process model for calculating mass and energy yields in a commercial-scale (2000 tonne/day) biorefinery. The ROM estimated biofuel yields of 65 to 130 gallons per ton of dry biomass. This results in biofuel minimum fuel-selling prices of $2.62–$5.43 per gallon and emissions of −13.62 to 145 kg of CO2 per MJ. The ROM achieved an average mean square error of 1.8 × 10–20 and a mean absolute error of 0.53%. These results suggest that ROMs can facilitate rapid feedstock screening for biorefinery systems.
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