The integration of tail-end calcium looping into an existing natural gas combined cycle (NGCC) power plant has minimal impact on CO capture retrofits. However, a high volume of flue gas needs to be preheated before entering the carbonator, and the relatively high energy consumption of oxygen production exacerbates the energy penalty of the NGCC system with tail-end CO capture. This paper proposes the method of pressurized calcium looping integrated with chemical looping combustion (PCaL-CLC). It employs the PCaL-CLC method to reduce the energy penalty and energy consumption of the NGCC system with tail-end CO capture. Results show that the proposed system using the PCaL-CLC method achieves a 3.0% reduction in energy penalty, decreasing from 9.1% in the reference system employing the calcium looping method to 6.1% in the proposed system. Besides, the specific energy consumption for CO avoided (SPECCA) declines from 4.43 MJ/kg CO to 2.76 MJ/kg CO. Exergy analysis and energy utilization diagrams reveal the underlying reason for improving system performance. Furthermore, by optimizing the operating parameters of the gas turbine and equipping it with advanced heat recovery steam generation, an energy penalty of 2.9% and a SPECCA of 1.21 MJ/kg CO are achieved without CO compression, which is superior to those of amine scrubbing and hot-end calcium looping CO capture technologies. The proposed PCaL-CLC method offers an alternative approach to reducing the energy consumption of tail-end CO capture in existing natural gas combined cycle power plants.

中文翻译：

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加压钙循环与化学循环燃烧相结合的方案和热力学研究，用于在改造的天然气联合循环发电厂中捕获尾部二氧化碳

将尾端钙循环集成到现有天然气联合循环 (NGCC) 发电厂对二氧化碳捕集改造的影响极小。然而，大量烟气在进入碳酸化器之前需要预热，而制氧能耗相对较高，加剧了尾部CO捕集NGCC系统的能源损失。本文提出了加压钙循环与化学循环燃烧相结合的方法（PCaL-CLC）。它采用 PCaL-CLC 方法来减少带有尾端 CO 捕获的 NGCC 系统的能量损失和能耗。结果表明，使用 PCaL-CLC 方法的所提出的系统实现了 3.0% 的能量损失降低，从采用钙循环方法的参考系统中的 9.1% 降低到所提出系统中的 6.1%。此外，避免 CO 的比能耗 (SPECCA) 从 4.43 MJ/kg CO 下降到 2.76 MJ/kg CO。火用分析和能源利用图揭示了系统性能提高的根本原因。此外，通过优化燃气轮机的运行参数并为其配备先进的热回收蒸汽发生装置，在不压缩CO的情况下实现了2.9%的能量损失和1.21 MJ/kg CO的SPECCA，优于胺洗涤和热端钙循环二氧化碳捕集技术。所提出的 PCaL-CLC 方法提供了一种减少现有天然气联合循环发电厂尾部二氧化碳捕集能耗的替代方法。