Influence of alkane working fluid decomposition on supercritical organic Rankine cycle systems

Influence of alkane working fluid decomposition on supercritical organic Rankine cycle systems
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烷烃工质分解对超临界有机朗肯循环系统的影响

DOI:
10.1016/j.energy.2018.04.083
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发表时间:
2018-06
期刊:
影响因子:
9
通讯作者:
Weizhong Qian
Weizhong Qian
中科院分区:
工程技术1区
文献类型:
--
作者:
Xiaoye Dai;Lin Shi;Qingsong An;Weizhong Qian

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超临界有机朗肯循环(ORC)由于其火用损失低、热效率高、功输出高而得到迅速发展。在为高温热源(150-350°C)选择工作流体时,工作流体的热稳定性是主要限制。在评估 ORC 的热稳定性时,工作流体分解的影响机制是重要的考虑因素。本研究以正戊烷为测试流体,分析了烷烃工质分解对ORC的影响。通过实验证实了气态和固态产物的组成。设计实验和ORC系统模型来分析气态和固态产物对ORC的不同影响机制。结果表明,主要影响因素是气态分解产物中不凝性气体引起的冷凝压力升高。对预测长期热稳定性方法的研究也很重要,值得进一步开展工作。
The supercritical Organic Rankine Cycle (ORC) develops rapidly due to its low exergy loss, high thermal efficiency and high work output. The thermal stability of working fluid is the major limitation when selecting the working fluid for high temperature heat sources (150–350 °C). The influence mechanisms of the working fluid decomposition are important considerations when evaluating the thermal stability for ORCs. This study analyzed the influence of alkane working fluid decomposition on ORCs with n-pentane as the test fluid. The compositions of the gaseous and solid products were confirmed by experiments. The experiments and ORC system model were designed to analyze the different influence mechanisms of gaseous and solid products on the ORCs. The results showed that the main influence is the condensation pressure rise caused by non-condensable gases in gaseous decomposition products. Studies on methods for predicting the long-term thermal stability are also significant and merit further work.
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