تاثیرگرمای اتلافی واحد احیای مستقیم آهن اسفنجی در یک چرخه ابتکاری توان – تبرید
محورهای موضوعی : یافته های نوین کاربردی و محاسباتی در سیستم های مکانیکیمحمد عباداللهی 1 * , سید هاشم صمدی 2
1 - استادیار گروه مهندسی نوین، دانشکده فناوری‌های نوین دانشگاه محقق اردبیلی
2 - دانش آموخته دکتری، مهندسی مکانیک بیوسیستم/ انرژی¬های تجدید پذیر دانشگاه تربیت مدرس، شرکت بین‌المللی مهندسی ایران (ایریتک)، تهران، ایران
کلید واژه: احیاء مستقیم, میدرکس, تولید هم‌زمان توان و برودت, سیکل رانکین آلی.,
چکیده مقاله :
روش‌های بازیابی گرمای هدررفتی راه قدرتمندی برای افزایش بهره‌وری کلی انرژی در تاسیسات صنعتی و نیروگاه‌ها ارایه میدهند. بسیاری از صنایع، از کارخانههای بزرگ فولاد گرفته تا نیروگاه‌های بزرگ - همواره به دنبال راه‌هایی برای استفاده مؤثرتر از انرژی هستند. گرمای هدررفتی گرمای باقیماندهای است که از فرایندهای صنعتی به دست میآید و معمولا فقط در محیط منتشر میشود. در این مقاله، با استفاده از گرمای هدررفتی یک واحد احیای آهن اسفنجی به روش میدرکس به‌عنوان منبع انرژی، به بررسی سامانه تولید هم‌زمان توان و تبرید با استفاده از سیکل رانکین آلی و سیکل تبرید اجکتوری آبشاری برای تولید هم‌زمان توان و برودت پرداخته شده است. در این تحقیق نشان داده شده است که چگونه بازیافت گرمای هدررفتی می‌تواند به بخشی ضروری از برنامه‌های تولید آهن اسفنجی به روش میدرکس تبدیل گردد. بر طبق نتایج به‌دست آمده مقدار توان خالص خروجی سامانه و مقدار برودت تولیدی اواپراتورهای 1 و 2 به ترتیب 85/47، 19/53 و 34/48 کیلووات محاسبه گردید. همچنین شاخص‌های تصمیم‌گیرنده سامانه یعنی ضریب عملکرد سیکل تبرید، بازده سیکل رانکین آلی و سیکل تولید هم‌زمان به ترتیب 452/0، 27/17 درصد و 29/50 درصد گزارش شد. همچنین مطالعه پارامتریک به‌منظور مشاهده تأثیر پارامترهای تاثیرگذار سامانه انجام گردید.
Waste heat recovery methods offer a powerful way to increase the overall energy efficiency of industrial facilities and power plants. Many industries – from large steel mills to large power plants – are constantly looking for ways to use energy more efficiently. So, one opportunity to consider is waste heat recovery. Waste heat is the residual heat that comes from industrial processes and is usually just released into the environment. Waste heat recovery systems intelligently capture this residual heat and reuse it instead of wasting it. In this paper, using the waste heat of a sponge iron regeneration unit using the Midrex method as an energy source, a simultaneous power and refrigeration production system using the organic Rankine cycle and the cascade ejector refrigeration cycle for simultaneous power and refrigeration production is investigated and it is shown why waste heat recovery can become an essential part of sponge iron production programs using the Midrex method. According to the results obtained, the net power output of the system and the amount of refrigeration produced by evaporators 1 and 2 were calculated as 47.85, 53.19 and 48.34 kW, respectively. Also, the decision-making indicators of the system, namely the coefficient of performance of the refrigeration cycle, the efficiency of the organic Rankine cycle and the simultaneous production cycle were reported as 0.452, 17.27% and 50.29 %, respectively. Also, a parametric study was conducted at the end of the article to observe the effect of influential system parameters.
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