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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Thermodynamic and economic investigations of transcritical CO2-cycle systems with integrated radial-inflow turbine performance predictions
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Thermodynamic and economic investigations of transcritical CO2-cycle systems with integrated radial-inflow turbine performance predictions

机译：具有径向流入汽轮机性能预测的跨临界CO2周期系统的热力学和经济调查

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Transcritical CO2 (TCO2) cycle systems have emerged as a promising power-generation technology in certain applications. In conventional TCO2-cycle system analyses reported in the literature, the turbine efficiency, which strongly determines the overall system performance, is generally assumed to be constant. This may lead to suboptimal designs and optimization results. In order to improve the accuracy and reliability of such system analyses and offer insight into how knowledge of these systems from earlier analyses can be interpreted, this paper presents a comprehensive model that couples TCO2-cycle calculations with preliminary turbine design based on the mean-line method. Turbine design parameters are optimized simultaneously to achieve the highest turbine efficiency, which replaces the constant turbine efficiency used in cycle calculations. A case study of heat recovery from an internal combustion engine (ICE) using a TCO2-cycle system with a radial-inflow turbine is then considered, with results revealing that the turbine efficiency is influenced by the system's operating conditions, which in turn has a significant effect on system performance in both thermodynamic and economic terms. A more generalized heat source is then considered to explore more broadly the role of the turbine in determining TCO2-cycle power-system performance. The more detailed turbine-design modelling approach allows errors of the order of up to 10-20% in various predictions to be avoided for steady-state calculations, and potentially of an even greater magnitude at off-design operation. The model allows quick preliminary designs of radial-inflow turbines and reasonable turbine performance predictions under various operating conditions, and can be a useful tool for more accurate and reliable thereto-economic studies of TCO2-cycle systems.
机译：在某些应用中，跨临界CO2（TCO2）循环系统已成为一种有前景的发电技术。在文献中报告的传统TCO2周期系统分析中，通常假设强烈地确定整体系统性能的涡轮效率是恒定的。这可能导致次优设计和优化结果。为了提高这些系统的准确性和可靠性分析，并提供了解这些系统如何从早期分析中获取如何解释，这篇论文提出了一种基于平均线的初步涡轮机设计耦合TCO2周期计算的综合模型方法。涡轮机设计参数同时进行优化，以实现最高的涡轮效率，取代循环计算中使用的恒定涡轮效率。然后考虑使用带有径向流入涡轮机的TCO2循环系统的内燃机（ICE）从内燃机（ICE）的热回收的案例研究，结果表明，涡轮机效率受到系统的操作条件的影响，这反过来又有一个热力学和经济方面的系统性能显着影响。然后认为更广泛的热源更广泛地探索涡轮机在确定TCO2周期电力系统性能时的作用。更详细的涡轮机设计建模方法允许在稳态计算中避免各种预测中的误差高达10-20％，并且可能在偏移操作时甚至更大的幅度。该模型允许在各种操作条件下快速初步设计径向流入涡轮机和合理的涡轮机性能预测，并且可以成为TCO2周期系统的更准确和可靠的有用工具。

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