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吸收烟气余热的非共沸混合工质蒸发换热特性

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Keywords: 有机朗肯循环,烟气余热,非共沸混合物,蒸发,温度分布

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Abstract:

为探讨低温有机朗肯循环系统冷热流体之间的传热特性,以新型二元非共沸混合工质R13I1+R601a为例,建立基于电站锅炉烟气余热吸收的蒸发器换热模型。考虑非共沸工质相变温度的滑移与烟气温度变化的匹配特性,并借助物性计算软件Refprop8.0考虑温度对非共沸工质物性的影响,分析了不同烟气流量、工质配比条件下蒸发器内的温度及温差分布,以及对过程火用损失的影响。结果显示:通过控制烟气流量可有效避免蒸发器内部温差极值点的出现;同时,研究还发现混合工质R13I1+R601a在0.8/0.2和0.7/0.3两种配比下换热曲线线性度较高,与烟气热源拟合较好,更有利于换热。R601a含量比例在0.2~0.3之间变化时,会出现温差由极大值向极小值转变。通过对混合工质组分更为细化的研究,有望得出更佳配比,进而提高整个有机朗肯循环系统的效率。

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