Utilizing Chemical Looping Combustion instead of Fired-Furnace in a Steam Methane Reforming for Enhancement of Hydrogen Production in a Multi Tubular Reactor

Document Type : Original Article

Authors

1 Department of Chemical Engineering, School of Chemical and Petroleum Engineering, Shiraz University, Shiraz 71345, Iran

2 Department of Chemical Engineering, School of Chemical and Petroleum Engineering, Shiraz University, Shiraz 71345, Fars, Iran

Abstract

A novel thermally coupled reactor containing steam methane reforming in the endothermic side and chemical looping combustion as an exothermic side has been investigated in this study. In this innovative configuration, huge fired furnace of conventional steam reforming process is substituted by chemical looping combustion in a recuperative coupled reactor. This reactor has three concentric tubes where the steam methane reforming is supposed to occur in the middle tube and the inner and outer tubes are considered to be air and fuel reactors of chemical looping combustion, respectively. Copper is selected as solid oxygen carrier in the chemical looping combustion process. Both oxidation and reduction of Cu in the air and fuel reactor are exothermic and used as heat sources for endothermic steam methane reforming.  A steady state heterogeneous model of fixed bed for steam reformer and a moving bed for chemical looping combustion reactor predict the performance of this new configuration. The counter-current mode is investigated and simulation results are compared with corresponding predictions of the conventional steam reformer. The results prove that synthesis gas production is increased in thermally coupled reactor in comparison with conventional steam reformer.  

Keywords

Article Title [فارسی]

جایگزینی چرخه شیمیایی احتراق به جای کوره در فرآیند تبدیل بخار با استفاده از کاتالیست مس

Authors [فارسی]

  • صدیقه کبیری 1
  • محمدرضا رحیم پور 2

1 کارشناسی ارشد مهندسی شیمی، کارمند منطقه 5 عملیات انتقال گاز، شرکت ملی گاز ایران

2 دکتری مهندسی شیمی، استاد بخش مهندسی شیمی، دانشگاه شیراز، شیراز، فارس، ایران

Abstract [فارسی]

این مقاله، به بررسی مدل سازی راکتور کوپلینگ حرارتی دو واکنش کاتالیستی ریفرمینگ متان با بخارآب و چرخه شیمیایی احتراق جهت بهبود میزان تولید هیدروژن می پردازد. کوپلینگ حرارتی دو واکنش گرماگیر و گرماده باعث بهبود بازده حرارتی و در نتیجه افزایش میزان تولید میشود. ریفرمینگ متان با بخارآب فرآیندی گرماگیر است که گرمای آن توسط یک کوره فراهم می شود. در این حالت، لوله های ریفرمرتحت تنش حرارتی بالایی قرار دارند. با جایگزینی این کوره با چرخه شیمیایی احتراق برانیم تا علاوه بر حل این مشکل تولید هیدروژن را در یک فرآیند کوپلینگ افزایش دهیم. چرخه شیمیایی احتراق نوعی احتراق غیر مستقیم است که از دو راکتور هوا و سوخت تشکیل شده است. در این فرآیند از تماس مستقیم سوخت با اکسیژن جلوگیری می شود و شرایط برای واکنش سوخت با یک اکسید فلز فراهم می شود. کوپل این دو واکنش کاتالیستی در یک راکتور سه لوله هم مرکز انجام می شود. راکتور درونی و بیرونی به ترتیب به عنوان راکتورهای هوا و سوخت چرخه شیمیایی احتراق و راکتور میانی راکتور ریفرمینگ متان منظور می شود. راکتور چرخه شیمیایی احتراق بستر متحرک است که مس در آن کاتالیست متحرک است. راکتور ریفرمینگ متان بستر ثابت است که از کاتالیست نیکل پر شده است. شبیه سازی فرآیند با استفاده از یک مدل یک بعدی هتروژن انجام شد. صحت مدل انجام شده با داده های راکتورریفرمینگ متان پالایشگاه گاز زاگرس عسلویه بررسی شد. نتایج حاصل با موارد مشابه در راکتور معمولی ریفرمینگ متان مقایسه شد که افزایش چشمگیر میزان هیدروژن مشاهده شد.

Keywords [فارسی]

  • تولید هیدروژن
  • ریفرمینگ متان با بخارآب
  • چرخه شیمیایی احتراق
  • کاتالیست نیکل و مس
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