بررسی عددی عملکرد فرآیند تولید هیدروژن با بازگردانی محصولات گازی در ورودی راکتور

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه بیرجند

2 گروه مکانیک، دانشکده مهندسی، دانشگاه بیرجند

چکیده

با توجه به مسائل زیست محیطی، سوخت‌های پاک مانند هیدروژن مورد توجه هستند. از بین روش‌های مختلف تولید هیدروژن، برای کاهش امکان رسوب کربن طی فرآیند تولید هیدروژن، انجام فرآیند در محدوده‌ دمای پایین‌تر، تبدیل بالای متان و هم‌چنین از جهت مصرف انرژی، اکسیداسیون جزئی متان اهمیت دارد. در کار حاضر با شبیه‌سازی عددی فرآیند اکسیداسیون جزئی کاتالیستی متان در حضور کاتالیست رودیم/آلومینا در یک راکتور بستر ثابت جریان قالبی، اثرات بازگردانی درصدهای حجمی مختلف محصولات گازی در ورودی راکتور بر میزان تولید هیدروژن، تولید کربن‌مونواکسید و کربن‌دی‌اکسید برای دماهای مختلف (900-500 درجه سلسیوس) و نسبت‌های اکسیژن به متان ورودی برابر 4/0، 5/0، 6/0 و 7/0 بررسی می‌شود، و بر اساس آن دما و نسبت مناسب اکسیژن به متان ورودی طی این فرآیند مشخص می‌گردد. نتایج نشان می‌دهد که در تمام محدوده دمایی با افزایش درصد حجمی بازگردانی محصولات گازی، تولید هیدروژن و کربن‌مونواکسید افزایش و تولید کربن‌دی‌اکسید کاهش می‌یابد. برای بازگردانی محصولات گازی در ورودی راکتور انتخاب دمای 600 درجه سلسیوس، نسبت اکسیژن به متان ورودی برابر 5/0 مناسب است و با بازگردانی 50 درصد حجمی محصولات گازی در این نسبت اکسیژن به متان و دما، تولید هیدروژن و کربن‌دی‌اکسید حدود 30 درصد به ترتیب افزایش و کاهش می‌یابد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Numerical Investigation of the Performance of Hydrogen Production Process by Production Gas Recirculation

نویسندگان [English]

  • Ali Saeedi 1
  • Nazila Allahdadi 2
1 University of Birjand
2 Department of Mechanical Engineering, Faculty of Engineering, University of Birjand
چکیده [English]

Clean energy sources such as hydrogen are developing because of environmental issues. Partial oxidation of methane is important among different methods of hydrogen production due to the reduction in carbon deposition, doing the process in a lower temperature range, the high conversion of methane and low energy consumption. In the present work, the numerical simulation of partial oxidation of methane with Rh/Al2O3 catalyst is conducted in a fixed bed flow reactor. The effect of different volumetric percentages of product gas recirculation on the hydrogen, carbon monoxide, and carbon dioxide production is calculated for various temperatures (500-900°C) and oxygen to methane ratios equal 0.4, 0.5, 0.6 and 0.7, respectively. According to that, the suitable temperature and oxygen to methane ratio are considered. The results show that in the temperature range, an increase in the product gas recirculation causes an increase in Hydrogen and CO production and a decrease in CO2 production. Moreover, the calculated data shows that the inlet oxygen to methane ratio of 0.5 and reaction temperature of 600°C is suitable to enhance Hydrogen production performance by production gas recirculation. Also, it is demonstrated that 50% volumetric product gas recirculation in that temperature and O2/CH4 ratio, leads to an increase in H2 production and a decrease in CO2 production about 30%.

کلیدواژه‌ها [English]

  • Hydrogen Production
  • Partial oxidation
  • Product recirculation
  • numerical simulation
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