CN103374332A - 含有环戊烷的有机朗肯循环混合工质 - Google Patents
含有环戊烷的有机朗肯循环混合工质 Download PDFInfo
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Abstract
本发明公开了一组含有环戊烷用于有机朗肯循环系统的混合工质,混合工质由环戊烷、HFC245fa和甲苯组成。将各组元物质按其指定的质量比,在常温下进行物理混合,静置至混合均匀。混合工质适合于蒸发温度为80-200℃的中低温朗肯循环系统。混合工质ODP为0,热工参数适宜:在中低温有机朗肯循环设计工况,如蒸发温度150℃,冷凝温度35℃,过热度为零度下,有机朗肯循环效率大于14%,单位质量输出净功基本在50kJ/kg以上,循环热利用率高。工质的三相点温度均在-90℃以下,临界温度超过150摄氏度,适用的范围较广。
Description
技术领域
本发明属于热力系统中的循环工质,具体涉及一种中低温有机朗肯循环系统中的工质。
背景技术
近些年来,随着有机朗肯循环发电技术的日益成熟,作为中低温资源的类如太阳能、地热能以及生产余热等,展现出了较大的潜能和利用空间。以中低温有机朗肯循环为例,利用余热热源进行发电,不仅可以减少化石能源(煤,石油等)的消耗,还可以降低温室气体效应和环境污染。目前制约中低温(100-250℃)发电技术发展和推广的重要因素之一就是其效率低下,其中有机工质的选配对系统的效率影响最大。因此开发环境友好、循环性能优良、蒸发温度为80-200℃,适合有机朗肯循环系统的新型有机工质具有重要的意义和经济价值。
发明内容
本发明的目的是,提供一种蒸发温度为80-200℃适用于中低温朗肯循环系统、含有环戊烷的混合工质,使其具有较高的热力循环性能。
本发明的技术方案是:含有环戊烷用于有机朗肯循环系统的混合工质,混合工质由环戊烷(C5H10)和HFC245fa(CF3CH2CHF2)组成;或由环戊烷(C5H10)和甲苯(CH3C6H5)组成。其质量百分比分别为:C5H10/CF3CH2CHF2:10-90/90-10%,C5H10/CH3C6H5:20-80/80-20%。以上两种混合工质其各自组元物质质量百分数之和为100%。
本发明的制备放方法是,将各组元物质按其指定的质量比,在常温下进行物理混合,静置至混合均匀。
本发明中的三种组元物质:环戊烷(C5H10),HFC245fa(CF3CH2CHF2)和甲苯(CH3C6H5),其各自的物性参数如表1所示。
表1混合工质各组元基本性能参数
其中:Tb:正常沸点;Tc临界温度;Pc:临界压力;Tt:三相点温度。
本发明具有以下几点有益效果:
(1)环保性能优良:本发明的ODP为0,具有良好的环境性能;(2)热工参数适宜:在中低温有机朗肯循环设计工况,如蒸发温度150℃,冷凝温度35℃,过热度为零度下,有机朗肯循环效率大于14%,单位质量输出净功基本在50kJ/kg以上(在汽轮机和工质本的等熵效率都在75%的条件下),循环性能优良;(3)循环热利用率高:由于本发明为二元非共沸混合工质,在相变过程中存在着温度滑移,与纯工质相比,可以实现更好的温度匹配,减少不可逆换热损失;(4)适用范围广:本发明工质的三相点温度均在-90℃以下,临界温度超过150摄氏度,适用的范围较广。
具体实施方式
将各组元物质按其指定的质量比,在常温下进行物理混合,静置至混合均匀,实施例中混合工质的各组员组分均值质量百分数。
实施例1:取80%C5H10、20%H FC-245fa,常温下进行混合后作为循环工质。
实施例2:取70%C5H10、30%H FC-245fa,常温下进行混合后作为循环工质。
实施例3:取60%C5H10、40%H FC-245fa,常温下进行混合后作为循环工质。
实施例4:取50%C5H10、50%H FC-245fa,常温下进行混合后作为循环工质。
实施例5:取40%C5H10、60%H FC-245fa,常温下进行混合后作为循环工质
实施例6:取30%C5H10、70%H FC-245fa,常温下进行混合后作为循环工质
实施例7:取70%C5H10、30%CH3C6H5,常温下进行混合后作为循环工质。
实施例8:取60%C5H10、40%CH3C6H5,常温下进行混合后作为循环工质。
实施例9:取50%C5H10、50%CH3C6H5,常温下进行混合后作为循环工质。
实施例10:取40%C5H10、60%CH3C6H5,常温下进行混合后作为循环工质。
实施例11:取30%C5H10、70%CH3C6H5,常温下进行混合后作为循环工质。
实施例12:取20%C5H10、80%CH3C6H5,常温下进行混合后作为循环工质。
循环系统的设计工况为:平均蒸发温度为150℃,平均冷凝温度为35℃,过热度为0,膨胀机和工质泵的等熵效率均为75%,根据循环计算,上述6个实施例的参数和有关循环性能指标如表2所示。
表2本发明实施例性能
表2续表
性能参数 | 实施例7 | 实施例8 | 实施例9 | 实施例10 | 实施例11 | 实施例12 |
蒸发压力(kPa) | 961.130 | 885.630 | 806.864 | 723.270 | 632.574 | 531.425 |
冷凝压力(kPa) | 49.759 | 45.5939 | 41.228 | 36.510 | 31.202 | 24.910 |
膨胀比 | 19.328 | 19.324 | 19.359 | 19.473 | 19.776 | 20.585 |
单位质量净输出功(W) | 87503.61 | 86980.52 | 86203.2 | 85221.36 | 84158.97 | 83340.55 |
朗肯循环效率(%) | 18.368 | 18.000 | 17.611 | 17.253 | 16.958 | 16.827 |
蒸发温度滑移(℃) | 13.876 | 17.519 | 20.256 | 21.814 | 21.788 | 19.461 |
冷凝温度滑移(℃) | 20.309 | 24.029 | 26.583 | 27.985 | 27.998 | 25.914 |
Claims (2)
1.含有环戊烷的有机朗肯循环混合工质,其特征是所述混合工质由环戊烷(C5H10)和HFC245fa(CF3CH2CHF2)组成,其质量百分比为:C5H10/CF3CH2CHF2:10-90/90-10%,其两组元物质质量百分数之和为100%。
2.一种按照权利要求1所述的含有环戊烷的有机朗肯循环混合工质,其特征是所述混合工质由环戊烷(C5H10)和甲苯(CH3C6H5)组成,其质量百分比为:C5H10/CH3C6H5:20-80/80-20%,其两组元物质质量百分数之和为100%。
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CN103013450A (zh) * | 2012-12-10 | 2013-04-03 | 天津大学 | 含有甲苯的有机朗肯循环混合工质 |
CN103195524A (zh) * | 2012-01-06 | 2013-07-10 | 联合工艺公司 | 用于朗肯循环系统的非共沸工作流体混合物 |
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