Thermodynamic and exergoeconomic performance assessment of a SOFC/GT cogeneration system integrating transcritical CO2 cycle and ejector refrigeration cycle

IF 6.1 2区 工程技术 Q2 ENERGY & FUELS Applied Thermal Engineering Pub Date : 2025-03-13 DOI:10.1016/j.applthermaleng.2025.126173
Chaoyi Xu , Jingjing Ye , Hao Jie , Jiawei Liao , Haowen Teng , Weirong Hong
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Abstract

Clean and efficient utilization of fossil fuels is becoming increasingly imperative for energy supply chains. In order to lower emissions and realize cascade energy utilization, this study proposes a novel solid oxide fuel cell/gas turbine (SOFC/GT) cogeneration system incorporating dual-stage transcritical CO2 cycle (TRCC) and ejector refrigeration cycle (ERC) subsystems. By further utilizing the residual low-temperature waste heat, the ERC subsystem addresses the challenge of subcritical CO2 condensation, which is difficult to manage with ambient air or water. Thermodynamic and exergoeconomic analyses are conducted to evaluate the overall performance based on the system steady-state model, where a one-dimensional SOFC model is adopted to monitor the safety status. Simulation results indicate that the system provides a net electrical output of 1228.54 kW and a heating capacity of 280.37 kW under the design condition. The net electrical efficiency, exergy efficiency, and overall energy utilization efficiency are 65.05%, 63.37%, and 79.90%, while the LCOE and payback period are 0.0599 $/kWh and 10.91 years, showing slight advantages compared to existing literature. According to simulation results, the SOFC, pre-reformer and afterburner have significant potential to enhance thermodynamic and economic performance. A sensitivity analysis of key parameters for the SOFC/GT subsystem is also performed to determine the feasible operating range from both performance and safety perspectives. In addition, the ideal working fluid for the TRCC subsystem is investigated, aiming to reduce operating pressure and improve thermal efficiency. Overall, the proposed system exhibits superior performance, providing a new configuration for efficient energy utilization and ideal economic profitability.
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清洁、高效地利用化石燃料对能源供应链的要求越来越高。为了降低排放并实现能源的梯级利用,本研究提出了一种新型固体氧化物燃料电池/燃气轮机(SOFC/GT)热电联产系统,该系统包含双级跨临界二氧化碳循环(TRCC)和喷射制冷循环(ERC)子系统。通过进一步利用剩余的低温余热,ERC 子系统解决了亚临界二氧化碳冷凝的难题,而这一难题很难通过环境空气或水进行管理。在系统稳态模型的基础上,进行了热力学和排气经济学分析,以评估整体性能,其中采用了一维 SOFC 模型来监控安全状态。模拟结果表明,在设计条件下,系统可提供 1228.54 kW 的净电力输出和 280.37 kW 的供热能力。净发电效率、放能效率和能源综合利用效率分别为 65.05%、63.37% 和 79.90%,LCOE 和投资回收期分别为 0.0599 美元/千瓦时和 10.91 年,与现有文献相比略有优势。根据模拟结果,SOFC、预转化器和后燃烧器在提高热力学性能和经济性能方面具有显著的潜力。还对 SOFC/GT 子系统的关键参数进行了敏感性分析,以便从性能和安全角度确定可行的运行范围。此外,还研究了 TRCC 子系统的理想工作流体,旨在降低工作压力和提高热效率。总之,所提出的系统表现出卓越的性能,为能源的高效利用和理想的经济收益提供了一种新的配置。
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来源期刊
Applied Thermal Engineering
Applied Thermal Engineering 工程技术-工程:机械
CiteScore
11.30
自引率
15.60%
发文量
1474
审稿时长
57 days
期刊介绍: Applied Thermal Engineering disseminates novel research related to the design, development and demonstration of components, devices, equipment, technologies and systems involving thermal processes for the production, storage, utilization and conservation of energy, with a focus on engineering application. The journal publishes high-quality and high-impact Original Research Articles, Review Articles, Short Communications and Letters to the Editor on cutting-edge innovations in research, and recent advances or issues of interest to the thermal engineering community.
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