炭素回収を備えたコンバインドサイクル発電所：システム統合による価値向上

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🔬研究者:EGRと蒸気統合がCCUSのエネルギー・資本費に与える影響を定量評価する際の設計指針となる。

🏢実務担当者:既設NGCCへのCCUSレトロフィット検討時に、EGRと蒸気統合によるコスト・エネルギー削減の選択肢を評価できる。

🏛政策担当者:火力脱炭素化とCCUS普及支援策の設計において、システム統合型レトロフィットの費用対効果を考慮する根拠となる。

Abstract Natural gas is traditionally considered a lower-carbon fossil fuel than coal, emitting roughly half the amount of CO2 per unit of electricity generated. Despite their comparative advantage, gas-fired power plants still contribute significantly to anthropogenic CO2 emissions. As the world moves towards net-zero emissions, even low-carbon fossil assets like natural gas combined cycles (NGCC) must implement solutions to reduce their carbon footprints. In this context, carbon capture utilization and storage (CCUS) emerges as a critical enabling technology (Ritchie et al., 2023). Currently, carbon capture solutions are categorized into three types: post-combustion, pre-combustion, and oxy-fuel combustion technologies. Among these, post-combustion carbon capture is considered to have the highest technology readiness level (TRL) and deployment maturity. Post-combustion capture offers significant advantages for power plants, as it can be retrofitted to existing operational facilities. This helps preserve the capital already invested in these plants, minimizes disruption to the power systems, and facilitates a gradual transition to more sustainable energy sources. Currently, carbon capture plants primarily utilize an aqueous monoethanolamine (MEA) solvent to extract carbon dioxide from flue gases. This technology has been extensively studied, and solvent-based carbon capture systems have been successfully implemented in refineries, chemical industries, and for acid gas sweetening in the oil and gas sectors. It is important to recognize that CO2 concentrations in exhaust gas from different sources can vary significantly, impacting the performance, configuration, and selection of carbon capture plant (CCP) technologies, as well as capital and operational expenses. For example, the exhaust gas from industrial land-based gas turbines typically contains around 3%-4.5% CO2 at near-atmospheric pressure, depending on the specific gas turbine model. The low pressure and density of flue gas led to high volume flows, which necessitate larger equipment's. These factors subsequently influence the plant's footprint and total installed cost. Furthermore, lower CO2 concentrations require higher energy input for effective CO2 separation. As a result, removing CO2 from sources with lower concentrations, such as natural gas combined cycle (NGCC), necessitates careful consideration. This paper discusses the improvements of a post-combustion carbon capture plant integrated with a NGCC through the application of exhaust gas recirculation (EGR) and steam integration. The EGR technology implies recirculating a portion of the flue gas from the stack back into the gas turbine inlet, where it is mixed with ambient air. The application of EGR increases the concentration of CO2 in the exhaust gas while reducing the amount of flue gas sent to the CCP. This dual effect enables a reduction in both the total energy consumption and capital expenditures of the CCP. Further optimisation can be realised through the integration of steam provided by the NGCC via steam extraction to help meet the regeneration energy requirements.

• openalex https://doi.org/10.2118/235491-msfirst seen 2026-11-03 04:53:12 · last seen 2026-11-06 04:53:02
• semanticscholar https://doi.org/10.2118/235491-msfirst seen 2026-11-05 05:57:35 · last seen 2026-11-06 05:30:16