ارزیابی کارایی جداسازی یک ستون تقطیر چندجزئی صنعتی توسط مدل تعادلی بهبود‌یافته بر اساس محاسبات بازدهی‌های چندجزئی

نوع مقاله : ترویجی

نویسندگان

1 دانشکده مهندسی شیمی، نفت و گاز، دانشگاه سمنان، ایران

2 دانشکده مهندسی شیمی، نفت و گاز دانشگاه سمنان، ایران

3 پژوهشکده چرخه سوخت هسته‌ای، پژوهشگاه علوم و فنون هسته‌ای، تهران

چکیده

در کار حاضر یک ستون تقطیر چندجزئی صنعتی برای جداسازی ایزوبوتان و نرمال‌بوتان توسط مدل مرحله‌ی تعادلی بهبود‌یافته بر اساس بازدهی‌های چندجزئی شبیه‌سازی شده است. شبیه‌سازی در شرایط پایا با محاسبه‌ی بازدهی‌های مورفریِ نقطه‌ای و مرحله‌ای اجزا انجام می‌شود. ابتدا بازدهی‌های نقطه‌ای بر مبنای نظریۀ دوفیلمی‌ و انتقال جرم چندجزئی محاسبه می‌‌شوند. بعد به کمک یک مدل مناسب اختلاط مایع، بازدهی‌های مرحله‌ای تعیین و در قالب روابط تعادلی بخار-مایع وارد روند شبیه‌سازی می‌‌شوند. از آن‌جایی که توصیف اختلاط مایع روی سینی‌ها در تعیین بازدهی‌های مرحله‌ای مؤثر است، در کار حاضر چندین مدل‌ مختلف برای اختلاط مایع بررسی و نتایج حاصل شامل روند تغییرات دما و غلظت محصولات با مقادیر آزمایشگاهی مقایسه شده‌اند. مقایسه‌ها نشان می‌‌دهند که مدل‌های جریان قالبی و اختلاط جزیی توانسته‌اند به خوبی روند تغییرات را پیش‌بینی کنند، به‌طوری که دماها و ترکیب محصولات به ترتیب اختلاف متوسط %0/5 و %21 نسبت به داده­های اندازه‌گیری دارند.

کلیدواژه‌ها


عنوان مقاله [English]

Separation Performance Evaluation of a Multicomponent Industrial Scale Distillation Column Using Modified Equilibrium Model Based on Multicomponent Efficiency Calculations

نویسندگان [English]

  • Hadi Poortalari 1
  • Farshad Varaminian 2
  • Javad Karimi Sabet 3
1 Chemical engineering, oil, gas faculty, Semnan University, Semnan, Iran
2 Chemical engineering, oil, gas faculty, Semnan University, Semnan, Iran
3 NFCRS, Nuclear Science and Technology Research Institute, Tehran, Iran
چکیده [English]

In this study, a multicomponent industrial column for separating i-butane/n-butane is simulated based on multicomponent efficiencies. Simulations are performed at steady state with the calculation of Murphree point and plate efficiencies of individual components. The multicomponent point efficiencies are computed using the multicomponent mass transfer and the two-film theory. The plate efficiencies are calculated from point efficiencies when the degree of mixing in the plates have been determined. Finally, the plate efficiencies incorporate into the equilibrium relations. As the description of liquid mixing on the plates plays an important role in the prediction of efficiencies, in the present work various liquid mixing models are investigated and results for the composition of products and temperature profile are compared with reported measured data. Comparisons confirm that the partial liquid mixing and plug flow models are able to predict column condition with good accuracy, so that the discrepancy between the experimental data and simulation results is about 0. 5% and 21% for the plate temperatures and composition of products, respectively.

کلیدواژه‌ها [English]

  • Multicomponent distillation
  • Modified Equilibrium Modeling
  • Murphree Efficiency
  • Stage Efficiency
  • Liquid Mixing Model
  • Two film model
  • Multicomponent Mass Transfer
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