مهندسی شیمی ایران

مهندسی شیمی ایران

مدل‌سازی و همانندسازی فرایند شیرین‌سازی گاز طبیعی با جاذب متیل‌دی‌اتانول آمین (MDEA) در تماس‌دهندۀ رشته‌های غشایی توخالی با نرم‌افزار کامسول

نوع مقاله : مقاله پژوهشی

نویسندگان
1 کارشناس ارشد مهندسی شیمی، دانشگاه رازی
2 دانشیار مهندسی شیمی، دانشگاه رازی
چکیده
فرایندهای جداسازی غشایی با ویژگیهای برجستۀ خود دربرابر فرایندهای سنتی مانند تقطیر، استخراج، جذب و غیره، توجه بسیاری را به‌خود جلب کردهاست. با گسترش و همانندسازی یک مدل ریاضی توانا در توصیف درست پدیدههای انتقال از میان غشاها می‌توان طراحی، کاربرد و راهبری آنها را بهبود بخشید. در این پژوهش، مدلی دوبعدی برای زدایش CO2 و H2S از مخلوط آن‌ها با CH4 (نمایانگر شیرین‌سازی گاز طبیعی) با جذب بر محلول آبی MDEA در تماس‌دهندۀ رشتههای غشایی توخالی پلی‌پروپیلن گسترش یافته و بابهره‌از دینامیک سیالات محاسباتی (CFD) در نرم‌افزار کامسول با روش المان محدود حل شده‌است. با راستیآزمایی شار همانندسازی‌شدۀ دی‌اکسید کربن ( 3-10×0/4-2/5 mol/m2.s) از میان غشا با داده‌های آزمایشگاهی، کمینه، میانگین و بیشینۀ خطای همانندسازی شار به‌ترتیب دربرابر سرعت‌های خطی فاز مایع 3/45، 9/56 و 17/45% و فاز گاز 2/64، 4/31 و 5/59% براورد شدند. از برون‌دادهای همانندسازی می‌توان دریافت که سرعت فازهای گاز و مایع جاذب، از مهم‌ترین عامل‌های اثرگذار در زدایش گازهای اسیدی هستند و هم‌چنین مقاومت انتقال جرم فاز مایع تعیین‌کننده است. با افزایش تخلخل غشا، غلظت مایع جاذب و افزایش دمای گاز، غلظت CO2 در گاز خروجی به‌ترتیب 46، 68 و 17/5 % کاهش مییابد. افزایش سرعت خطی فازهای گاز و مایع در درون تماس‌دهندۀ غشایی، شار جذب CO2 را به‌ترتیب 15% کاهش و 4/5 برابر افزایش می‌دهد. در زدایش هم‌زمان گازهای اسیدی نسبت‌به زدایش CO2 به‌تنهایی راندمان فرایند حدود 8 % ~ کاهش می‌یابد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Modeling and Simulation of Natural Gas Sweetening Process by Methyldiethanolamine (MDEA) Absorbent in the Hollow Fiber Membrane Contactor Using COMSOL Software

نویسندگان English

M. Bakhshizade 1
O. Bakhtiari 2
1 M. Sc. in Chemical Engineering, Razi University
2 Associated Professor of Chemical Engineering, Razi University
چکیده English

Membrane separation processes are interesting compared with the traditional processes such as distillation, extraction, absorption, etc. due to their superior advantages. Development and simulation of a precise mathematical model for description of phenomena occurred during permeation and transfer of components through membrane could enable one to improve their design, application and operation. In this research a two-dimensional model was used for simulation of CO2 and H2S removal from their mixture with CH4 (as a representative of natural gas sweetening) by absorption on MDEA aqueous solution in polypropylene hollow fiber membrane contactors. The model was solved and simulated using computational fluid dynamic (CFD) in COMSOL software by finite element method. Validation of the simulated CO2 fluxes (0.4 - 2.5 × 10-3 mol/m2.s) through the membrane vs. liquid phase velocity vs. experimental data reveled minimum, average, and maximum errors of 3.45, 9.56, and 17.45 % and those for the gas phase velocity were 2.64, 4.31, and 5.59 %, respectively. The results showed that the gas and liquid absorbent phases’ velocities are the most important affecting factors on the acid gas removal. Also, the liquid phase mass transfer resistance was found determining. With increase in membrane porosity, absorbent concentration and gas phase temperature, the gas outlet’s CO2 concentration were reduced by 45, 68, and 17.5 %, respectively. Increment in the gas and absorbent velocities, reduced and increased the CO2 absorption flux by 15 % and 4.5-fold, respectively. Simultaneous removal of H2S and CO2 reduces the only CO2 removal efficiency by~8 %.

کلیدواژه‌ها English

Hollow Fibers
Membrane Contactor
Natural Gas Sweetening
Simulation
Computational Fluid Dynamic
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