مهندسی شیمی ایران

مهندسی شیمی ایران

کاهش هزینه‌های اقتصادی و زیست‌محیطی واحد سرویس جانبی پالایشگاه تهران بااستفاده‌از برنامه‌ریزی غیرخطی عدد صحیح مختلط

نوع مقاله : مقاله پژوهشی

نویسندگان
1 کارشناس ارشد مهندسی شیمی، دانشگاه تهران
2 دانشیار مهندسی شیمی، دانشگاه تهران
3 استاد مهندسی شیمی، دانشگاه تهران
چکیده
در پژوهش حاضر، رویکردی جدید برای تحلیل آب، انرژی و محیط زیست در واحد سرویس جانبی پالایشگاه تهران پیشنهادشده‌است. هزینه‌های عملیاتی به‌عنوان تابع هدف اقتصادی تعریف و 5 طرح پیشنهادی، شامل: حذف تعدادی از تجهیزات فعال، مانند دیگ بخار و توربین بررسیشد. با ازمدارخارجکردن تجهیزاتی که با حداقل ظرفیت خود کارمی‌کنند و افزایش راندمان دیگر تجهیزات، نیز، واردات برق با نرخ پایین‌تر می‌توان به ۲3-1 درصد صرفه‌جویی در هزینه‌های عملیاتی دستیافت. سپس، طرح افزودن چرخۀ رانکین آلی به تجهیزات موجود باهدف کاهش هزینه‌های اقتصادی و آثار زیستمحیطی ارائه‌شد. تابع هدف زیست‌محیطی برپایۀ روش‌های ارزیابی چرخۀ حیات ارائه و بهینه‌سازی دوهدفۀ شبکۀ بخار پالایشگاه باکمک روش محدودیت اپسیلون انجامشد. نتایج نشانداد که مقدار کمینۀ هزینه‌های عملیاتی برابربا M$/y 35/09 است (معادلبا بیشترین اثرات زیست‏محیطی MPt/y 24/68). هم‌چنین، مقدار کمینۀ تابع هدف زیست‌محیطی برابربا
MPt/y 20/68 (معادلبا بیشترین مقدار هزینه‏های عملیاتی یعنی M$/y 35/26) است. انتخاب نهایی درزمینۀ وزن‌دهی به اهمیت هرکدام از این توابع هدف براساس شرایط موجود برعهدۀ تصمیم‌گیرندگان است. طرح افزودن چرخۀ رانکین آلی با دورۀ بازگشت سرمایۀ ۵ساله، می‌تواند راه‌ حلی مناسب برای تأمین بخشیاز توان مورد نیاز شبکه با هزینۀ عملیاتی پایین‌تر و کاهش آثار زیستمحیطی باشد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Reducing Economic and Environmental Costs in the North Utility Plant of Tehran Oil Refinery Using MINLP

نویسندگان English

F. Mohammad Mohammadi 1
N. Tahouni 2
M. H. Panjeshahi 3
1 MSc. in Chemical Engineering, University of Tehran
2 Associate Professor of ChemicalEngineering, University of Tehran
3 Professor of Chemical Engineering, University of Tehran
چکیده English

In this research, a new approach was proposed to analyze water, energy and environment in the north utility plant of Tehran Oil Refinery. Operating costs were defined as an economic objective function and five scenarios were examined, including the elimination of some equipment such as boilers and turbines. By removing equipment that operates at minimal capacity, increasing the efficiency of other equipment and importing electricity, a 1-23% saving in operational costs can be achieved. Subsequently, the addition of an organic Rankine cycle to the existing equipment was proposed as a scenario aimed at reducing both economic costs and environmental impacts. The environmental objective function was presented based on life cycle assessment methods, and the multi-objective optimization of the refinery's steam network was performed using the e-constraint method. The results showed that
the minimum amount of operating costs is equal to 35.09 M$/y, while the most environmental effects are observed at this point (24.68 MPt/y). On the other hand, the minimum value of the environmental objective function is equal to 20.68 MPt/y, while the operating costs of the unit reach their highest value, that is, 35.26 M$/y. The final selection, in terms of prioritizing the importance of each objective function, rests with the decision-makers based on the existing conditions. The scenario of adding the organic Rankine cycle with a payback period of 5 years is a suitable solution for generating part of the power demand of the network with a lower operating cost and reducing environmental effects.

کلیدواژه‌ها English

Steam Network
Mathematical Modeling
Utility Plant
Water
Energy
Environment Nexus
Process Integration
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