Thermoeconomic analysis of sCO2 power cycles

IF 3.5 3区工程技术 Q2 ENGINEERING, CHEMICAL

AIChE Journal Pub Date : 2024-06-05 DOI:10.1002/aic.18502

Duoli Chen, John P. O'Connell, Warren D. Seider

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Abstract

The second-law analysis evaluates the irreversibilities of a process. Systematic study of the relationship between thermodynamic efficiency and process modifications enhances process synthesis. The Allam cycle is an oxy-fuel combustion cycle with nearly complete carbon capture that offers greater efficiency than current electricity generating systems. This study applies lost work analysis to the original Allam cycle and three modifications to obtain the distribution of irreversibilities and the effects of different configurations among potential process improvements for more sustainable power generation. The major inefficiencies are from the combustors and heat exchangers. We also examine the economic profitability of the alternatives. The largest equipment costs are for the turbines, compressors, and recuperators. We find that improving efficiency leads to less economic return; a configuration with partial compression has the highest efficiency, while the original Allam cycle has the highest profitability. We discuss how to resolve this apparent conflict between sustainability and profitability.

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二氧化碳发电循环的热经济分析

第二定律分析评估工艺的不可逆性。对热力学效率和工艺修改之间的关系进行系统研究，可以提高工艺的综合性。Allam 循环是一种全氧燃烧循环，几乎可以完全捕获碳，其效率高于当前的发电系统。本研究对原有的 Allam 循环和三种改良方法进行了损失功分析，以获得不可逆性的分布情况以及不同配置对潜在工艺改进的影响，从而实现更可持续的发电。主要的低效率来自燃烧器和热交换器。我们还考察了替代方案的经济效益。涡轮机、压缩机和换热器的设备成本最高。我们发现，提高效率会降低经济收益；部分压缩的配置效率最高，而原有的阿兰循环盈利能力最高。我们讨论了如何解决可持续性和盈利性之间的明显冲突。

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来源期刊

AIChE Journal 工程技术-工程：化工

CiteScore

7.10

自引率

10.80%

发文量

411

审稿时长

3.6 months

期刊介绍： The AIChE Journal is the premier research monthly in chemical engineering and related fields. This peer-reviewed and broad-based journal reports on the most important and latest technological advances in core areas of chemical engineering as well as in other relevant engineering disciplines. To keep abreast with the progressive outlook of the profession, the Journal has been expanding the scope of its editorial contents to include such fast developing areas as biotechnology, electrochemical engineering, and environmental engineering. The AIChE Journal is indeed the global communications vehicle for the world-renowned researchers to exchange top-notch research findings with one another. Subscribing to the AIChE Journal is like having immediate access to nine topical journals in the field. Articles are categorized according to the following topical areas: Biomolecular Engineering, Bioengineering, Biochemicals, Biofuels, and Food Inorganic Materials: Synthesis and Processing Particle Technology and Fluidization Process Systems Engineering Reaction Engineering, Kinetics and Catalysis Separations: Materials, Devices and Processes Soft Materials: Synthesis, Processing and Products Thermodynamics and Molecular-Scale Phenomena Transport Phenomena and Fluid Mechanics.

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