روشهای عددی در مهندسی

روشهای عددی در مهندسی

ارزیابی ترمودینامیکی-زیست‌محیطی تبدیل نیروگاه‌های گازی ایران به سیکل‌ترکیبی

نوع مقاله : مقاله پژوهشی

نویسندگان
دانشکده مهندسی مکانیک، دانشگاه کاشان، کاشان، ایران
چکیده
مطالعه حاضر، تحلیل ترمودینامیکی و زیست‌­محیطی چهار پیکربندی توربین‌های گاز کلاس E و F و سیکل‌های ترکیبی متناظر آن‌ها (CCGT-E وCCGT-F ) را ارائه نموده و بخشی از مزایای سیکل ترکیبی نسبت به سیکل توربین­های گاز تبیین شده است. تحلیل‌های انرژی و اگزرژی برای ارزیابی بازده، تخریب اگزرژی، انتشار دی­اکسیدکربن ویژه (SCE)و شاخص‌های پایداری انجام شد. شاخص بدیع پایداری زیست‌محیطی- اگزرژتیکی توسعه یافته (EESI) معرفی و اثبات ریاضی آن ارائه شد. نتایج نشان داد CCGT-F به بالاترین مقادیر شاخص‌ پایداری اگزرژتیکی ESI و شاخص EESI به ترتیب برابر با 1/13 و 1/72 دست می‌یابد. CCGT-F با بازده حرارتی 56/31% (17/04% بالاتر از GT-F) و CCGT-E با بازده 48/73% (14/67% بالاتر از GT-E) عملکرد برتری دارند و از منظر زیست‌‌محیطی، CCGT-E و CCGT-F انتشار دی­اکسیدکربن را به‌ ترتیب 30/1% و 39/5% نسبت به GT-E کاهش می‌دهند. در صورت تحقق تبدیل واحدهای گازی کشور به سیکل ترکیبی، علاوه بر افزایش ظرفیت تولید حداقل 7000 مگاواتی شبکه و صرفه جوئی سوخت، موجب بهبود شرایط زیست‌محیطی و جلوگیری از انتشار روزانه حداقل 50 هزار تن دی­اکسیدکربن می‌گردد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Thermodynamic-Environmental Assessment of Converting Iran’s Gas Power Plants to Combined Cycle

نویسندگان English

AhmadReza Rahmati
Nematollah Mazrouei
Department of Mechanical Engineering, University of Kashan, Kashan, Iran
چکیده English

This study presents a thermodynamic and environmental analysis of four configurations of E-class and F-class gas turbines and their corresponding combined cycles (CCGT-E and CCGT-F) to explain some of the advantages of combined cycles over gas turbine cycles. Energy and exergy analyses were conducted to evaluate efficiency, exergy destruction, specific CO2 emissions (SCE), and sustainability indices. A novel environmental exergy sustainability index (EESI) was developed and its mathematical proof was presented. The results demonstrate that CCGT-F achieves the highest exergetic sustainability index (ESI) and EESI values of 1.13 and 1.72, respectively. CCGT-F, with a thermal efficiency of 56.31% (17.04% higher than GT-F), and CCGT-E, with an efficiency of 48.73% (14.67% higher than GT-E), exhibit superior performance. From an environmental perspective, CCGT-E and CCGT-F reduce CO2 emissions by 30.1% and 39.5% compared to GT-E, respectively. Conversion of the country's gas power plants to combined cycle could add at least 7,000 MW grid generation capacity, save fuel, and prevent at least 50,000 tons of daily CO2 emissions.

کلیدواژه‌ها English

Exergy Analysis
Energy Analysis
Gas Turbine
Combined Cycle
Environmental Sustainability
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