Journal
COMPUTERS & CHEMICAL ENGINEERING
Volume 35, Issue 9, Pages 1647-1690Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.compchemeng.2011.01.041
Keywords
Process synthesis; Heat and power integration; Hybrid energy systems; Thermochemical; Mixed-integer nonlinear optimization
Funding
- National Science Foundation [NSF EFRI-0937706]
- Emerging Frontiers & Multidisciplinary Activities
- Directorate For Engineering [0937706] Funding Source: National Science Foundation
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A thermochemical based process superstructure and its mixed-integer nonlinear optimization (MINLP) model are introduced to convert biomass (switchgrass). coal (Illinois #6), and natural gas to liquid (CBGTL) transportation fuels. The MINLP model includes simultaneous heat and power integration utilizing heat engines to recover electricity from the process waste heat. Four case studies are presented to investigate the effect of CO2 sequestration (CCS) and greenhouse gas (GHG) reduction targets on the process topology along with detailed parametric analysis on the role of biomass and electricity prices. Topological similarities for the case studies include selection of solid/vapor-fueled gasifiers and iron-catalyzed Fischer-Tropsch units that facilitate the reverse water-gas-shift reaction. The break-even oil price was found to be $57.16/bbl for CCS with a 50% GHG reduction, $62.65/bbl for CCS with a 100% GHG reduction, $82.68/bbl for no CCS with a 50% GHG reduction, and $91.71 for no CCS with a 100% GHG reduction. (C) 2011 Elsevier Ltd. All rights reserved.
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