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A Pinch-Based Approach for Targeting Carbon Capture, Utilization, and Storage Systems

Thengane, Sonal K., Tan, Raymond R., Foo, Dominic C. Y., Bandyopadhyay, Santanu
Industrial & engineering chemistry process design and development 2019 v.58 no.8 pp. 3188-3198
carbon, carbon dioxide, carbon sequestration, fossil fuels, greenhouse gas emissions, power plants, process design, storage time
Carbon capture and storage (CCS) reduces carbon dioxide (CO₂) emissions by sequestration of captured CO₂ for long-term storage whereas carbon capture and utilization (CCU) offers resource conservation benefits by displacing the need for extracted CO₂ from natural sources. The integration of these two results in a carbon capture, utilization, and storage (CCUS) system, which either uses CO₂ for profitable applications or stores it in the reservoirs. One of the key problems in CCS systems is to optimally match the sources (e.g., CO₂ captured from fossil-fueled power plants) and the sinks (e.g., available geological reservoirs for storing the captured CO₂). In practice, the geological storage sites may be available at different times and have limitations on the maximum CO₂ storage capacity and the injectivity rate, subject to other geological characteristics. This work proposes an improved pinch analysis-based methodology by simultaneously considering the injectivity constraints and variable availability of all sources and sinks. Two types of CO₂ storage are considered in this work, that is, sinks with fixed life and sinks with fixed capacity. A new CCUS Mapping Diagram is presented to show the capture of CO₂ to the individual sinks. Four illustrative examples demonstrate the applicability of the proposed methodology to the CCUS systems in which purity is not a constraint in CO₂ utilization. In some cases, the improved methodology overcomes the pitfall of the previous method by identifying rigorous CCUS targets.