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地热源非共沸工质有机朗肯循环发电性能分析

DOI: 10.13334/j.0258-8013.pcsee.2014.32.002, PP. 5701-5708

Keywords: 有机朗肯循环,混合物,地热能,热力学,低温热源

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Abstract:

建立有机朗肯循环热力学模型和蒸发器传热模型;基于工质的实验经验状态方程,利用REFPROP8.0软件获得非共沸工质物性;以获得最佳的凝汽器温度匹配为原则选择工质。采用种温度的地热能,在给定的蒸发器和凝汽器夹点温差下,分析了采用组分比例为0.64:0.36的R600a/R601非共沸工质的有机朗肯循环发电系统的特性,并与R601纯工质发电循环进行了比较。结果表明:以对外输出功为目标函数的利用地热的中低温有机朗肯循环发电系统中不宜加入回热器;对于蒸发器热源进出口温差较小的工况,如热源来自水蒸气凝结放热,采用混合工质的循环的性能不如纯工质的;有机朗肯循环采用混合工质时其最大对外输出功要高于纯工质的,且热源温度越低时,这种优势越明显。

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