تعیین چیدمان بهینه برج‌های تقطیر با در نظر گرفتن ادغام حرارتی به روش برنامه‌نویسی ریاضی مبتنی بر بهینه‌سازی اَبَرساختار

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناسی ارشد، دانشکده مهندسی شیمی، دانشگاه علم و صنعت، تهران، ایران

2 دانشیار، دانشکده مهندسی شیمی، دانشگاه علم و صنعت، تهران، ایران

3 استادیار، پژوهشکده مهندسی پالایش، پژوهشگاه صنعت نفت، تهران، ایران

چکیده

در این مقاله مسأله تعیین چیدمان بهینه برج‌های تقطیر در یک سیستم‌ تقطیر چند جزئی، با در نظر گرفتن ادغام حرارتی بین کندانسور و ریبویلر برج‌های مختلف، به روش برنامه‌نویسی ریاضی بررسی شده است. مساله مورد بحث در اینجا به دلیل وجود قیود غیر‌خطی و همین‌طور متغیرهای گسسته و پیوسته در مدل بهینه‌سازی، یک برنامه غیرخطی آمیخته با عدد صحیح، MINLP، خواهد بود. مدل MINLP حاصل از برنامه‌نویسی ریاضی به کمک نرم‌افزار گمز حل شده است. جامعیت مدل بهینه‌سازی و انعطاف‌پذیری آن در تعریف شرایط عملیاتی جدید از ویژگی‌های این کار به حساب می‌آید. بهینه‌سازی همزمان چیدمان و مصرف انرژی امکان ارزیابی تأثیر ادغام حرارتی بر انتخاب چیدمان بهینه فراهم کرده است. در نظر گرفتن ادغام حرارتی در کاهش مصرف انرژی با متغیر بودن فشار برج تقطیر امکان‌پذیر شده است بطوریکه نتایج حاصل از حل مدل MINLP برای یک جداسازی چهار جزئی، میزان صرفه‌جویی برابر 25% در هزینه‌ کلی سالانه که شامل هزینه‌های سرمایه‌گذاری، عملیاتی و میزان مصرف انرژی می‌شود، را نشان می‌دهد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Synthesis of Optimal Heat-Integrated Distillation Columns Sequence with Mathematical Programming method based on Superstructure Optimization

نویسندگان [English]

  • Morteza Mahmudimanesh 1
  • Norollah Kasiri 2
  • Javad Ivakpour 3
1 M.Sc in Chemical Engineering Iran University of Science and Technology School of Chemical Engineering
2 Faculty member of staff Iran University of Science and Technology School of Chemical Engineering
3 Faculty member of staff Reseach Institute of Petroleum Industry
چکیده [English]

In this paper, the problem of optimal distillation columns sequence determination for a multicomponent distillation system with heat integration between condensers and reboilers of various columns with using mathematical programming approach considered. Existence of nonlinear constraints also discrete and continuous variables in optimization model is reason that the problem will be a Mixed-Integer-Non-Linear-Program (MINLP). MINLP model that obtained from mathematical programming is solved with GAMS. Some of proposed method features are generality and flexibility for defining new operating conditions. In proposed MINLP model, the effect of heat integration on optimal sequence has been considered by simultaneous optimization of sequencing and energy demand. Energy saving using heat integration has become possible by regarding column pressure as a variable in optimization model. The Results obtained from solution of MINLP model for a four components separation, shows 25% saving in total annual cost that includes investment, operation costs and energy consumption. . .

کلیدواژه‌ها [English]

  • Distillation columns sequence
  • Heat integration
  • optimization
  • Mathematical program
  • Mixed-Integer-Non-Linear-Programming (MINLP)

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نشریه مهندسی مکانیک امیرکبیر
دوره 48، شماره 3
مهر 1395
صفحه 227-238

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