本文關鍵詞：抽氣回熱式有機朗肯循環(huán)熱經(jīng)濟性的定量分析　出處：《化工學報》2014年02期 　論文類型：期刊論文

  更多相關文章： 熱力學 碳氫化合物 優(yōu)化 有機朗肯循環(huán) 抽氣回熱 熱經(jīng)濟性

【摘要】：探討了抽氣回熱對13種工質(zhì)熱效率的影響規(guī)律。當主氣溫度低于0.9Tcr時,采用無過熱的o2循環(huán),則抽氣回熱對熱效率的提升隨主氣溫度的升高而增加;當主氣溫度高于0.9Tcr時采用有過熱的o3循環(huán),則隨著主氣溫度的上升抽氣回熱對熱效率的提升減弱。計算了工質(zhì)的復雜程度因子σ,復雜程度高的工質(zhì)采用抽氣回熱對熱效率的提升潛力較小。采用抽氣回熱后,R236ea、R600a、R600、R245fa和R123的熱效率可提高9%以上,而六甲基二硅氧烷(MM)和八甲基三硅氧烷(MDM)則低于5%。o2循環(huán)的最佳抽氣系數(shù)及工質(zhì)流量隨主氣溫度的升高線性上升,而o3循環(huán)的最佳抽氣系數(shù)基本不變。另外,透平排氣溫度高的工質(zhì),最佳抽氣系數(shù)高,但是回熱效果差。抽氣回熱使R600a、R600、R245fa和R123質(zhì)量流量的增加在40%以內(nèi),而高溫工質(zhì)MM和MDM則提高了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%.
【作者單位】： 清華大學熱科學與動力工程教育部重點實驗室 二氧化碳資源化利用與減排技術(shù)北京市重點實驗室;
【基金】：國家自然科學基金項目(51236004,51321002) 國家重點基礎研究發(fā)展計劃項目(2009CB219805)~~
【分類號】：TM619
【正文快照】： 引言有機朗肯循環(huán)(ORC)采用低沸點的有機工質(zhì),是利用低溫熱源發(fā)電的重要途徑。在低溫熱源下,相比于小容量的水蒸氣朗肯循環(huán),ORC透平效率高、結(jié)構(gòu)緊湊、體積小、金屬消耗量低、干流體工質(zhì)不侵蝕葉片;此外ORC系統(tǒng)還具有啟停方便、負荷適應性好、部分負荷效率高、維護費用低、運

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