抽气回热式有机朗肯循环热经济性的定量分析

发布时间：2018-01-05 08:35

本文关键词：抽气回热式有机朗肯循环热经济性的定量分析　出处：《化工学报》2014年02期 　论文类型：期刊论文

【摘要】：探讨了抽气回热对13种工质热效率的影响规律。当主气温度低于0.9Tcr时,采用无过热的o2循环,则抽气回热对热效率的提升随主气温度的升高而增加;当主气温度高于0.9Tcr时采用有过热的o3循环,则随着主气温度的上升抽气回热对热效率的提升减弱。计算了工质的复杂程度因子σ,复杂程度高的工质采用抽气回热对热效率的提升潜力较小。采用抽气回热后,R236ea、R600a、R600、R245fa和R123的热效率可提高9%以上,而六甲基二硅氧烷(MM)和八甲基三硅氧烷(MDM)则低于5%。o2循环的最佳抽气系数及工质流量随主气温度的升高线性上升,而o3循环的最佳抽气系数基本不变。另外,透平排气温度高的工质,最佳抽气系数高,但是回热效果差。抽气回热使R600a、R600、R245fa和R123质量流量的增加在40%以内,而高温工质MM和MDM则提高了50%以上。
[Abstract]:The effect of extraction reheat on the thermal efficiency of 13 working fluids is discussed. When the main gas temperature is lower than 0.9Tcr, the o2 cycle without overheating is adopted. The increase of the thermal efficiency of the exhaust gas reheat increases with the increase of the temperature of the main gas. When the temperature of the main gas is higher than 0.9Tcr, the thermal efficiency is weakened with the increase of the temperature of the main gas, and the complexity factor 蟽 of the working fluid is calculated. The working fluid with high degree of complexity has less potential to improve the thermal efficiency by air extraction and recuperation, and R236ea1 / R600aN / R600 is used to regenerate the heat. The thermal efficiency of R245fa and R123 can be increased by more than 9%. However, hexamethyldisiloxane (MMM) and octamethyltrisiloxane (MDM)) were lower than the optimal extraction coefficient and working fluid flow rate of 5o 2 cycle, which increased linearly with the increase of the main gas temperature. In addition, the best extraction coefficient of the working fluid with high turbine exhaust temperature is high, but the heat recovery effect is poor. The mass flow rates of R245fa and R123 are increased within 40%, while the high temperature working fluids MM and MDM increase by more than 50%.
【作者单位】：清华大学热科学与动力工程教育部重点实验室二氧化碳资源化利用与减排技术北京市重点实验室;
【基金】：国家自然科学基金项目(51236004,51321002) 国家重点基础研究发展计划项目(2009CB219805)~~
【分类号】：TM619
【正文快照】： 引言有机朗肯循环(ORC)采用低沸点的有机工质,是利用低温热源发电的重要途径。在低温热源下,相比于小容量的水蒸气朗肯循环,ORC透平效率高、结构紧凑、体积小、金属消耗量低、干流体工质不侵蚀叶片;此外ORC系统还具有启停方便、负荷适应性好、部分负荷效率高、维护费用低、运

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