بررسی سیکل فرابحرانی دی‌اکسیدکربن با تراکم مجدد: مقایسه از دیدگاه تحلیل اگزرژی پیشرفته و ترمواکونومیک

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی مکانیک/پژوهشکده مطالعات کاربردی سیستم های قدرت، دانشکاه شهیدمدتی آذزبایجان، تبریز، ایزان

2 دانشگاه تبریز

چکیده

در این مقاله، سیکل فرابحرانی دی‌اکسیدکربن با تراکم مجدد از دیدگاه تحلیل اگزرژی پیشرفته و ترمواکونومیک، برای شناخت پتانسیل‌های واقعی و اولویت‌بندی مناسببهبود اجزاء سیکل مورد بررسی و مقایسه قرار گرفته است. در تحلیل اگزرژی پیشرفته، علاوه بر محاسبه نابودی اگزرژی برونزای کل برای جزء مورد نظر، سهم و تأثیر هر یک از دیگر اجزاء و ترکیب آن‌ها در ایجاد این ناکارآمدی نیز مشخص شده است. در تحلیل ترمواکونومیک سیستم نیز هزینه واحد محصول، هزینه سرمایه‌گذاری و هزینه نابودی اگزرژی برای اجزاء سیستم محاسبه شده است. اولویت بهبود براساس تحلیل اگزرژی پیشرفته، به ترتیب به بازیاب دما بالا، توربین، کمپرسور1، پیش‌خنک‌کن، بازیاب دما پایین، کمپرسور2 و رآکتور به دلیل دارا بودن بیشترین نرخ نابودی اگزرژی اجتناب‌پذیر درونزا اختصاص می‌یابد. که این اولویت‌بندی با نتایج تحلیل اگزرژی معمولی متفاوت است. همچنین، بر اساس تحلیل ترمواکونومیک، بهبود توربین و رآکتور، توجیه اقتصادی ندارد. با این حال نتایج نشان می‌دهد که حتی با صرف نظر کردن از بهبود این دو جزء، به دلیل بالا بودن هزینه اقتصادی آن‌ها و با بهبود سایر اجزای سیکل براساس اولویت بندی تحلیل اگزرژی پیشرفته امکان افزایش بازده اگزرژی سیکل از 29/47% به 47/63 % و بازده انرژی سیکل از 15/34% به 84/45 % وجود دارد.
 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Advanced exergy and thermoeconomic analysis of the supercritical carbon dioxide recompression cycle: A comparative study

نویسندگان [English]

  • Mohsen Fallah 1
  • Zahra Mohammadi 2
  • S. Mohammad S. Mahmoudi 2
1 Mechanical engineering group, Azarbaijan Shahid Madani University
2 Tabriz university
چکیده [English]

In this paper, the superconducting carbon dioxide cycle is re-examined and compared from the perspective of advanced and thermoconomic exergy analysis to identify real potentials and prioritize the improvement of cycle components. In advanced exergy analysis, in addition to calculating the total exogenous exergy destruction for each component, the contribution and effect of each of the other components and their combination in causing this inefficiency have also been identified. In thermoeconomic analysis of the system, the unit cost of the product, the cost of investment and the cost of destroying the exergy for the components of the system are calculated. Improvements based on advanced exergy analysis are assigned to high temperature recuperator, turbine, compressor 1, preheater, low temperature recuperator, compressor 2 and reactor, respectively. Also, based on thermoeconomic analysis, improving the turbine and reactor is not economically justified. However, the results show that even by abandoning the improvement of these two components, due to their high economic cost and by improving other components of the cycle based on the prioritization of advanced exergy analysis, it is possible to increase the efficiency of the exergy cycle from 4/29/47. There is 63% to 47.4% and cycle energy efficiency from 34.15% to 45.84%.

کلیدواژه‌ها [English]

  • thermoeconomic
  • Endogenous exergy destruction
  • Exogenous exergy destruction
  • Avoidable exergy destruction
  • Unavoidable exergy destruction
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