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DOE OSTI · 3001687

A high fidelity and user-friendly equation-oriented optimization model for carbon capture using a novel water-lean solvent

Kamichetty, Jaykiran·Pan, Shu·Costandy, Joe·Morgan, Joshua·Gupta, Vijay
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Abstract

Research Triangle Institute (RTI) International and SLB have developed a novel water-lean solvent technology for carbon capture, demonstrating low specific reboiler duty (SRD) values at capture rates exceeding 90%. At the Technology Centre Mongstad (TCM) pilot plant, the technology achieved an SRD of 2.55 GJ/t-CO2 at 95% capture, utilizing an intercooler and a 5°C temperature approach in the lean/rich solvent cross exchanger. To meet varying carbon capture targets for Front End Engineering and Design (FEED) studies and to enable real-time optimization and advanced process control, an efficient optimization model is required. This model needs to minimize energy demand for a given capture rate and determine optimal operating parameters in response to fluctuating flue gas conditions. While an existing Aspen Plus simulation model, developed by RTI and SLB, accurately matches TCM plant data, its sequential modular (SM) strategy is too slow for real-time applications due to recycle streams and tight heat integration inherent in solvent-based carbon capture processes. Although an equation-oriented (EO) modeling strategy is more suitable for optimizing these processes, its adoption has been limited by several factors: feature limitations in Aspen Plus EO mode (e.g., lack of balance block support), a less user-friendly interface for variable identification and loop solving, complex troubleshooting of convergence issues, and the necessity for accurate initial values.

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Kamichetty, Jaykiran, Pan, Shu, Costandy, Joe, Morgan, Joshua, Gupta, Vijay. 2024-10-20. A high fidelity and user-friendly equation-oriented optimization model for carbon capture using a novel water-lean solvent. https://www.osti.gov/biblio/3001687

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