The Allam cycle is renowned for its zero-carbon power generation and high efficiency. However, it faces challenges in hot regions where there is no available cold source for carbon dioxide liquefaction, leading to deterioration in its performance. In this study, a multi-stage pump/compressor is introduced, aiming to enhance the net electric efficiency of the conventional Allam cycle. Various potential enhancement methods are explored and analyzed through comprehensive thermodynamic and economic analyses. Among the configurations under consideration, the Allam cycle combined with two-stage pump/compressor and bypass compressor exhibits the best performance, achieving a 6.71 % increase in the efficiency of the conventional cycle. For the conventional Allam cycle, the efficiency decreases by 0.42 % for every 1 ℃ increase in ambient temperature, however, it is 0.17 % for the Allam-MPC cycle, which indicates it is less responsive to changes in ambient temperature. Moreover, the economic performance of the proposed cycle is better than that of the conventional cycle, which has higher revenue and lower levelized cost of electricity. The capital costs of the modified equipment represent around 1.43 % of the total capital costs of the conventional Allam cycle, and the investment-increment payback period is less than 0.5 years when the ambient temperature exceeds 30 ℃. Sensitivity analyses suggest that the proposed cycle will be more economically viable in hot regions with lower natural gas prices and higher electricity prices. Overall, this study provides a promising approach to improving the performance of Allam cycle in hot regions and offering valuable references for its practical implementation.

中文翻译：

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对采用多级泵/压缩机的改进阿拉姆循环配置进行技术经济评估，以实现炎热地区的高效运行

阿拉姆循环以其零碳发电和高效率而闻名。然而，它在炎热地区面临着挑战，那里没有可用的二氧化碳液化冷源，导致其性能恶化。在这项研究中，引入了多级泵/压缩机，旨在提高传统阿拉姆循环的净电效率。通过综合热力学和经济分析，探索和分析了各种潜在的增强方法。在考虑的配置中，结合两级泵/压缩机和旁路压缩机的阿拉姆循环表现出最佳性能，比传统循环效率提高了6.71%。对于传统的Allam循环，环境温度每升高1℃，效率降低0.42%，而Allam-MPC循环的效率降低0.17%，这表明它对环境温度变化的响应较差。此外，所提议的循环的经济性能优于传统循环，其具有更高的收入和更低的平准化电力成本。改造设备的资金成本约占传统阿拉姆循环总资金成本的1.43%左右，当环境温度超过30℃时，投资增量回收期小于0.5年。敏感性分析表明，在天然气价格较低和电价较高的炎热地区，拟议的循环将更具经济可行性。总体而言，本研究为提高炎热地区阿拉姆循环的性能提供了一种有前途的方法，并为其实际实施提供了有价值的参考。