Comparison of the Organic Flash Cycle (OFC) to other advanced vapor cycles for intermediate and high temperature waste heat reclamation and solar thermal energy
Comparison of the Organic Flash Cycle (OFC) to other advanced vapor cycles for intermediate and high temperature waste heat reclamation and solar thermal energy
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DOI：
10.1016/j.energy.2012.03.067
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发表时间：
2012-06
期刊：
影响因子：
9
通讯作者：
Tony Ho;S. Mao;R. Greif
中科院分区：
文献类型：
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作者：
Tony Ho;S. Mao;R. Greif
有机闪蒸循环（OFC）被提出作为一种蒸汽动力循环，可以潜在地提高利用高和中温有限热源的效率。OFC的目的是改善温度匹配并减少热量添加过程中的火用损失。在详细的热力学和火用分析中，使用高精度的状态方程，如METRONE，Span-Wagner和REFPROP进行理论研究。该研究考察了10种不同的芳烃和硅氧烷作为潜在的工作流体。OFC和优化的基本有机朗肯循环（ORC），非共沸朗肯循环使用的二元氨-水混合物，和跨临界CO2循环之间的比较。结果表明，芳烃是更适合的工作流体的ORC和OFC，由于更高的功率输出和不太复杂的涡轮机的设计。结果还表明，单闪式OFC实现了与优化的基本ORC相当的利用效率。虽然OFC提高了热添加效率，但这一优势被闪蒸过程中引入的不可逆性所抵消。OFC的许多潜在的显著改进是可能的，包括使用二次闪蒸级或用两相膨胀机代替节流阀。
The Organic Flash Cycle (OFC) is proposed as a vapor power cycle that could potentially improve the efficiency with which high and intermediate temperature finite thermal sources are utilized. The OFC's aim is to improve temperature matching and reduce exergy losses during heat addition. A theoretical investigation is conducted using high accuracy equations of state such as BACKONE, Span–Wagner, and REFPROP in a detailed thermodynamic and exergetic analysis. The study examines 10 different aromatic hydrocarbons and siloxanes as potential working fluids. Comparisons are drawn between the OFC and an optimized basic Organic Rankine Cycle (ORC), a zeotropic Rankine cycle using a binary ammonia-water mixture, and a transcritical CO2cycle. Results showed aromatic hydrocarbons to be the better suited working fluid for the ORC and OFC due to higher power output and less complex turbine designs. Results also showed that the single flash OFC achieves comparable utilization efficiencies to the optimized basic ORC. Although the OFC improved heat addition exergetic efficiency, this advantage was negated by irreversibilities introduced during flash evaporation. A number of potentially significant improvements to the OFC are possible though which includes using a secondary flash stage or replacing the throttling valve with a two-phase expander.