CN110257012A - 适于270℃热源的有机朗肯循环五氟丁烷/环己烷工质 - Google Patents

适于270℃热源的有机朗肯循环五氟丁烷/环己烷工质 Download PDF

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CN110257012A
CN110257012A CN201910595957.8A CN201910595957A CN110257012A CN 110257012 A CN110257012 A CN 110257012A CN 201910595957 A CN201910595957 A CN 201910595957A CN 110257012 A CN110257012 A CN 110257012A
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hexamethylene
pentafluorobutane
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organic rankine
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CN110257012B (zh
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翟慧星
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Beijing University of Civil Engineering and Architecture
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    • C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
    • C09K5/02—Materials undergoing a change of physical state when used
    • C09K5/04—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa
    • C09K5/041—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa for compression-type refrigeration systems
    • C09K5/044—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa for compression-type refrigeration systems comprising halogenated compounds
    • C09K5/045—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa for compression-type refrigeration systems comprising halogenated compounds containing only fluorine as halogen
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    • C09K2205/00—Aspects relating to compounds used in compression type refrigeration systems
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    • C09K2205/12—Hydrocarbons
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    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • C09K2205/00—Aspects relating to compounds used in compression type refrigeration systems
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    • C09K2205/12—Hydrocarbons
    • C09K2205/122—Halogenated hydrocarbons
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • C09K2205/00—Aspects relating to compounds used in compression type refrigeration systems
    • C09K2205/24—Only one single fluoro component present

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  • Chemical Kinetics & Catalysis (AREA)
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Abstract

本发明提供了一种适于270℃热源的有机朗肯循环五肯循环五氟丁烷/环己烷工质，包括：五氟丁烷和环己烷，其中混合工质中五氟丁烷的质量百分比为60‑80％，环己烷的质量百分比为40‑20％。本发明的混合工质ODP值为零，GWP值极低，环境性能良好，热工循环性能优异，其热源利用

Description

适于270℃热源的有机朗肯循环五氟丁烷/环己烷工质
技术领域
本发明涉及热力循环技术领域，尤其涉及一种适于270℃热源条件的有机朗肯循环五氟丁烷/环己烷工质。
背景技术
随着化石能源的枯竭和环境问题的日益突出，充分利用余热资源和开发可再生能源是减少化石能源消耗、降低温室气体和污染物排放的重要途径。由于250-300℃热源广泛存在于工业余热和可再生能源中，如果采用此温度区间的热能直接进行热利用，能量品位会严重降低；如果采用常规蒸汽动力循环发电则效率较低，目前此温度区间的热源通常没有被很好地利用。有机朗肯循环可以利用350℃以下的热源进行发电，发电效率较常规蒸汽动力循环有明显提高。目前现有技术中限制有机朗肯循环应用的主要原因是系统的经济性较差。因此，需要开发一种环境友好、热力性能良好的混合工质，以进一步提高系统效率，提高系统的经济性以及促进250-300℃热源的高效利用。
发明内容
本发明提供了一种适于270℃热源的有机朗肯循环五肯循环五氟丁烷/环己烷工质，以解决现有技术中的270℃热源发电效率低的问题。
为了实现上述目的，本发明采取了如下技术方案。
本发明提供了一种适于270℃热源的有机朗肯循环五氟丁烷/环己烷工质，包括：五氟丁烷和环己烷，其中混合工质中五氟丁烷的质量百分比为60-80％，环己烷的质量百分比为40-20％。
优选地，混合工质中五氟丁烷的质量百分比为60％，环己烷的质量百分比为40％。
优选地，混合工质中五氟丁烷的质量百分比为70％，环己烷的质量百分比为30％。
优选地，混合工质中五氟丁烷的质量百分比为80％，环己烷的质量百分比为20％。
由上述本发明的适于270℃热源条件的有机朗肯循环五氟丁烷/环己烷工质的技术方案可以看出，本发明的有机朗肯循环五氟丁烷/环己烷工质具有以下
有益效果：
(1)本发明的混合工质的ODP值为零，GWP值较低，环境性能良好；
(2)热工循环性能：同样的热源进出口条件下，本发明的混合工质热源利用效率均在50％以上，相比性能最优异的纯工质还可提高2.8％-3.9％。
本发明附加的方面和优点将在下面的描述中部分给出，这些将从下面的效率描述中变得明显，或通过本发明的实践了解到。
具体实施方式
下面通过描述的实施方式是示例性的，仅用于解释本发明，而不能解释为对本发明的限制。
本技术领域技术人员可以理解，除非特意声明，这里使用的单数形式“一”、“一个”、“所述”和“该”也可包括复数形式。应该进一步理解的是，本发明的说明书中使用的措辞“包括”是指存在所述特征、整数、步骤、操作、元件和/或组件，但是并不排除存在或添加一个或多个其他特征、整数、步骤、操作、元件、组件和/或它们的组。应该理解，这里使用的措辞“和/或”包括一个或更多个相关联的列出项的任一单元和全部组合。
本技术领域技术人员可以理解，除非另外定义，这里使用的所有术语(包括技术术语和科学术语)具有与本发明所属领域中的普通技术人员的一般理解相同的意义。还应该理解的是，诸如通用字典中定义的那些术语应该被理解为具有与现有技术的上下文中的意义一致的意义，并且除非像这里一样定义，不会用理想化或过于正式的含义来解释。
为便于对本发明实施例的理解，下面将以具体实施例为例做进一步的解释说明。
本发明所提出的一种适于270℃热源的有机朗肯循环五肯循环五氟丁烷/环己烷工质包括五氟丁烷和环己烷按不同的质量百分比组成，且这两种物质的质量百分比的和为100％，制备方法是按本发明的各个配比直接物理混合而成。各组元物质的基本参数如下表1所示。
表1混合工质所含组元的基本参数
其中，M为工质分子量，Tc为工质临界温度，Pc为工质临界压力，ODP为臭氧层破坏潜能值，GWP为温室效应潜能值。
上述混合工质各组元物质的具体配比(质量百分数)为：
五氟丁烷/环己烷:60-80/40-20％。
本发明所采用的具体实施例如下：
实施例1：取0％的环己烷和100％的五氟丁烷；
实施例2：取10％的环己烷和90％的五氟丁烷在常温下进行物理混合；
实施例3：取20％的环己烷和80％的五氟丁烷在常温下进行物理混合；
实施例4：取30％的环己烷和70％的五氟丁烷在常温下进行物理混合；
实施例5：取40％的环己烷和60％的五氟丁烷在常温下进行物理混合；
实施例6：取50％的环己烷和50％的五氟丁烷在常温下进行物理混合；
实施例7：取60％的环己烷和40％的五氟丁烷在常温下进行物理混合；
实施例8：取70％的环己烷和30％的五氟丁烷在常温下进行物理混合；
实施例9：取80％的环己烷和20％的五氟丁烷在常温下进行物理混合；
实施例10：取90％的环己烷和10％的五氟丁烷在常温下进行物理混合；
实施例11：取100％的环己烷和0％的五氟丁烷。
以270℃热源为例，有机朗肯循环系统的设计工况为蒸发夹点温差30℃，冷凝夹点温差10℃，蒸发器出口过热度5℃，冷凝器出口过冷度5℃，膨胀机等熵效率0.8，泵等熵效率0.65，并依据热源情况取合适回热度，上述11个实施例及该工况下，在不同热源出口条件下的最佳纯工质异己烷isohexane的有关参数和循环性能指标如下表2-3所示。
表2热源出口条件为165℃实施例循环性能参数和指标
表3热源出口条件为145℃实施例循环性能参数和指标
通过上表2-3可以看出，当五氟丁烷的质量百分比为80％，环己烷的质量百分比为20％；五氟丁烷的质量百分比为70％，环己烷的质量百分比为30％；五氟丁烷的质量百分比为60％，环己烷的质量百分比为40％；(即实施例3、4、5)时，系统均有较为良好的热效率和热源利用效率值。随着热源出口温度降低，最佳混合工质中所含五氟丁烷的比例越高，环己烷的比例越低。采用所述的最佳混合工质其循环热源利用效率相对于对应条件下的最佳纯工质分别有2.8％、3.9％的提升，可以根据热源出口温度，循环采用合适的回热装置。
以上实施例仅用于说明本发明的设计思想和特点，其目的在于使本领域内的技术人员能够了解本发明的内容并据以实施，本发明的保护范围不限于上述实施例。多以，凡依据本发明所揭示的原理、设计思路所作的等同变化或修饰，均在本发明的保护范围之内。

Claims (4)

1.一种适于270℃热源的有机朗肯循环五氟丁烷/环己烷工质，其特征在于，包括：五氟丁烷和环己烷，其中混合工质中五氟丁烷的质量百分比为60-80％，环己烷的质量百分比为40-20％。
2.根据权利要求1所述的工质，其特征在于，所述的混合工质中五氟丁烷的质量百分比为60％，环己烷的质量百分比为40％。
3.根据权利要求1所述的工质，其特征在于，所述的混合工质中五氟丁烷的质量百分比为70％，环己烷的质量百分比为30％。
4.根据权利要求1所述的工质，其特征在于，所述的混合工质中五氟丁烷的质量百分比为80％，环己烷的质量百分比为20％。
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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