شبیه‌سازی و بهینه‌سازی سیکل رانکین آلی بازیافت انرژی حرارت اتلافی پالایشگاه با سیال عامل مخلوط
محورهای موضوعی : انرژی های تجدید پذیر
بهنام سمیع
1
,
مسعود ترابی آزاد
2
,
غلامرضا صالحی
3
,
کامران لاری
4
1 - دانشجوی دکتری مهندسی سیستم های انرژی، واحد تهران شمال، دانشگاه آزاد اسلامی، تهران، ایران
2 - استاد، گروه فیزیک دریا، واحد تهران شمال، دانشگاه آزاد اسلامی، تهران، ایران
3 - دانشیار،گروه مهندسی مکانیک، دانشکده فنی و مهندسی، واحد تهران مرکز، دانشگاه آزاد اسلامی، تهران، ایران
4 - دانشیار گروه فیزیک دریا، واحد تهران شمال، دانشگاه آزاد اسلامی، تهران، ایران
کلید واژه: سیکل رانکین آلی, ترمواکونومیک, اکسرژی, بهینه‌سازی ازدحام ذرات, سیال عامل مخلوط.,
چکیده مقاله :
زمینه و هدف: اتلافات انرژی در پالایشگاههای نفت و گاز را میتوان با استفاده از سیکلهای رانکین آلی به توان تبدیل نمود و میزان مصرف سوخت کاهش و الایندی را کاهش داد. تحقیق حاضر به بهینه سازی چرخه رانکین الی با سیال عامل مخلوط با الگوریتم ازدحام ذرات میپردازد.
روش بررسی: دو مدل سیکل مختلف سیکل رانکین ساده (BORC)، سیکل رانکین با مبدل میانی (RORC) در نرم‌افزار ASPEN HYSYS شبیه‌سازی شده و این مدل ها برای توابع هدف راندمان انرژی و نرخ هزینه کل بهینه‌سازی شده‌اند. حرارت گاز خروجی سیکل گازی خروجی پالایشگاه به عنوان منبع اصلی گرما در سیکل‌ها استفاده شده است. تعداد 10 سیال انتخاب و حالت خالص و ترکیب چند جزیی این سیالات با دقت 1/0 به عنوان سیال عامل استفاده شده است.
یافته ها: تجزیه و تحلیل ترمودینامیکی و ترمواکونومیکی برای هر سیکل انجام شده و نتایج با یکدیگر مقایسه گردیدند. اثر سیالات عامل مختلف، فشار ورودی پمپ و فشار خروجی پمپ بر عملکرد سیکل نیز ارزیابی شده است. انتخاب سیال عامل بر عملکرد ترمودینامیکی سیستم تأثیر می‌گذارد، زیرا تفاوت چشم‌گیری در عملکردهای ترمودینامیکی در یک سیکل با شرایط یکسان با سیال عامل مختلف دیده می‌شود.
بحث و نتیجه گیری: وجود مبدل میانی باعث کاهش اکسرژی تخریب شده کندانسور می‌شود. همچنین از نتایج مشاهده می‌شود که افزایش فشار ورودی کندانسور تأثیر منفی بر عملکرد ترمودینامیکی و اقتصادی دارد و عملکرد ترمودینامیکی سیکل‌ها با افزایش فشار ورودی توربین افزایش می‌یابد.
Background and Objectives: Energy losses in oil and gas refineries can be converted into power using organic Rankine cycles. The present study focuses on optimizing the organic Rankine cycle with mixed working fluid using particle swarm optimization.
Material and Methodology: Energy losses in oil and gas refineries can be converted into power using organic Rankine cycles. The present study focuses on optimizing the organic Rankine cycle with mixed working fluid using particle swarm optimization. For this purpose, two different cycle models are simulated in Aspan Hysys software and these models are optimized for the objective functions of energy efficiency and total cost rate. The simulated cycles are: simple Organic Rankine Cycle (BORC), Rankine cycle with intermediate heat exchanger (RORC). The exhaust gas heat of the refinery outlet gas cycle is used as the main heat source in the cycles. 10 fluids are selected and the pure state and multicomponent mixture of these fluids are used as working fluids with an accuracy of 0.1.
Finding: Thermodynamic and thermoeconomic analysis are performed for each cycle and the results are compared with each other. The effect of different working fluids, pump inlet pressure and pump outlet pressure on the cycle performance is also evaluated. The choice of working fluid affects the thermodynamic performance of the system, because a significant difference in thermodynamic performances is seen in a cycle with the same conditions with different working fluids.
Discussion and conclusion: The presence of an intermediate exchanger reduces the destroyed exergy of the condenser. It is also observed from the results that increasing the condenser inlet pressure has a negative effect on the thermodynamic and economic performance, and the thermodynamic performance of the cycles increases with increasing turbine inlet pressure.
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