شبیه‌سازی CFD حذف دی‌اکسید‌کربن از مخلوط گازی توسط تماس‌دهنده غشایی فیبر توخالی پلی‌وینیلیدین‌فلوراید

نوع مقاله: مقاله پژوهشی

نویسندگان

گروه مهندسی شیمی، دانشکده فنی و مهندسی، دانشگاه یاسوج، ایران

چکیده

در این پژوهش با استفاده از تکنیک دینامیک سیالات محاسباتی، مدل دو بعدی حذف دی‌اکسید‌کربن (CO2) با یک تماس‌دهنده غشایی فیبر توخالی از جنس پلی‌وینیلیدین‌فلورید مورد بررسی قرار گرفت. در این مدل انتشار محوری و شعاعی لحاظ شده است. همین‌طور جریان همرفت در پوسته و لوله در نظر گرفته شده است. معادلات پیوستگی، مومنتوم و جرم به روش المان محدود حل شده است. نتایج این مدل تطابق خوبی را با داده‌های آزمایشگاهی حذف دی‌اکسیدکربن از مخلوط گاز توسط آب را دارد. در سرعت m/s 5 مایع جاذب درصد حذف دی‌اکسیدکربن در دمای ثابت 10 و C° 40 به‌ترتیب 36/55 و 25/46 % می‌باشد. در سرعت m/s 02/0 مخلوط گازی و سرعت m/s 5 مایع جاذب درصد حذف دی‌اکسیدکربن درجریان ناهمسو و همسو به‌ترتیب 43/51 و 34/23 % می‌باشد. با افزایش سرعت مایع راندمان حذف افزایش می‌یابد. با افزایش سرعت مخلوط گاز راندمان حذف کاهش می‌یابد. همچنین نشان داده شد که این روش قادر به پیش‌بینی عملکرد تماس‌دهنده غشایی فیبر توخالی برای جذب دی‌اکسید‌کربن از مخلوط‌های گازی است.
 

کلیدواژه‌ها


عنوان مقاله [English]

CFD Simulation of CO2 Removal from Gas Mixtures in Hollow Fiber Membrane Contactors PVDF

نویسندگان [English]

  • mohammad sabzehmeidani
  • Asgar Lashani
  • Hossein Moeini
Chemical Engineering Department, Faculty of Engineering, Yasouj University, Yasouj, Iran
چکیده [English]

In this study, a 2D numerical model is investigated for removal of CO2 in a hydrophobic polyvinylidene fluoride (PVDF) hollow fiber membrane contactor (HFMC) using the computational fluid dynamics (CFD) method.  The model considers axial and radial diffusion in the membrane contactor. It also considers convection in the tube and shell side. The model governing equations were solved with using finite-element method. Simulation predictions were validated with the experimental data obtained from literature for CO2 absorption from the gas mixture by water. The simulation predictions were in good agreement. The results of this model are in good agreement with experimental data CO2 removal from the gas mixture by water. In velocity 5 m/s absorbent fluid removal efficiency carbon dioxide at a constant temperature of 10 and 40 °C, respectively, 55.36 and 46.25 %. In velocity of 5 m/s absorbent fluid and 0.2 m/s gas mixture removal efficiency of carbon dioxide absorbent 51.43 and 23.34 % respectively during counter current and co-current flow. Increasing liquid velocity led to an increase in removal efficiency of carbon dioxide. By increasing the gas mixture velocity, removal efficiency is reduced. It is shown that this method is able to predict the performance of the membrane contactor hollow fiber to absorb CO2 from the gas mixture.
 

کلیدواژه‌ها [English]

  • Computational Fluid Dynamics (CFD)
  • Contacts the Membrane
  • Earbon Dioxide
  • PVDF
  • Hollow Fiber Membrane

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