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The discussion of composition shift in organic Rankine cycle using zeotropic mixtures

机译：利用共沸混合物对有机朗肯循环中组分迁移的讨论

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Zeotropic mixtures have been important candidates for working fluids in the organic Rankine cycle (ORC) because of the temperature glide characteristic. "Composition shift" is a widespread phenomenon for zeotropic mixtures' application in thermodynamic systems and certainly needs to be considered in ORC. In this paper, the evaporator, condenser, expander and pump models are respectively developed and then the circulating composition is calculated. Based on that, the forming reasons of "composition shift" are well illuminated. The influences of composition shift on the system net power output and heat transfer process are presented and analysed. The influence factors including pressure, two-phase zone area, total charge mass and velocity difference between liquid and vapor phase are also carefully discussed. Besides, the inner relation between temperature glide and composition shift is also revealed at last. The results showed that the optimal charge concentration of the low boiling point component in practice should be a bit lower than the optimal concentration without considering composition shift. Besides, the local composition shift characteristic will affect the heat transfer process by altering the temperature along the heat exchanger. Reducing the two-phase zone area, increasing the total charge mass, increasing the evaporation pressure and reducing the slip ratio can mitigate the effect of composition shift. The simulation also reveals that the magnitudes of temperature glide and composition shift show a good linear relation by just altering the charge composition. (C) 2017 Elsevier Ltd. All rights reserved.
机译：由于温度滑移特性，共沸混合物已成为有机朗肯循环（ORC）中工作流体的重要候选者。共沸混合物在热力学系统中的广泛应用是“成分转移”现象，在ORC中肯定需要考虑这一点。本文分别建立了蒸发器，冷凝器，膨胀器和泵的模型，然后计算了循环组成。基于此，很好地阐明了“组成偏移”的形成原因。给出并分析了组分转移对系统净功率输出和传热过程的影响。还仔细讨论了影响因素，包括压力，两相区面积，总电荷质量以及液相和气相之间的速度差。此外，还揭示了温度滑移与成分变化之间的内在联系。结果表明，实践中低沸点组分的最佳进料浓度应略低于最佳浓度而不考虑组成变化。此外，局部组成变化特性将通过改变沿热交换器的温度来影响传热过程。减小两相区面积，增加总装料质量，增加蒸发压力和减小滑移率可以减轻成分偏移的影响。该模拟还表明，仅改变电荷组成，温度滑移的大小和组分偏移就显示出良好的线性关系。 （C）2017 Elsevier Ltd.保留所有权利。

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