بررسی دینامیک سیالات محاسباتی تأثیر دما بر ذخیره‌سازی زیرزمینی هیدروژن در مغارهای نمکی حاوی کربن‌دی‌اکسید

نوع مقاله : مقاله پژوهشی

نویسندگان

1 انستیتو مهندسی نفت، دانشکده مهندسی شیمی، دانشکدگان فنی، دانشگاه تهران، ایران

2 انستیتو مهندسی نفت، دانشکده مهندسی شیمی، دانشکدگان فنی، دانشگاه تهران، ایران/هسته ذخیره‌سازی زیرزمینی هیدروژن، دانشگاه تهران، ایران

چکیده

گرمایش زمین نیاز بشر به انرژی‌های پاک را حیاتی‌تر کرده است. هیدروژن به‌عنوان یک سوخت پاک در دهه اخیر موردتوجه محققان قرار گرفته است و اخیراً جهت یافتن راهکارهای مناسب برای بهره‌وری هر چه بیشتر از این سوخت مطالعات زیادی در حال انجام است. مغارهای نمکی که با انحلال گنبدهای نمکی ایجاد می‌شوند به‌عنوان یکی از مهم‌ترین ساختارهای زمین‌شناختی برای ذخیره‌سازی میان‌مدت و امن هیدروژن شناخته می‌شوند. وجود ناخالصی‌های مختلف- اعم از ناخالصی‌هایی که به‌همراه هیدروژن تزریق می‌شوند و یا از ساختارهای زمین‌شناختی مجاور به مغار نفوذ می‌کنند- عملیات ذخیره‌سازی را با چالش روبرو می‌کند که از ناخالصی‌های محتمل می‌توان به کربن‌دی‌اکسید اشاره کرد. در این پژوهش با استفاده از یک رویکرد دینامیک سیالات محاسباتی که قبل‌تر در شبیه‌سازی فرآیند ذخیره‌سازی هیدروژن استفاده نشده است به بررسی تأثیر دما بر پارامترهای مختلف از جمله تغییرات فشار مغار نمکی، فشار جزئی اجزا، کیفیت هیدروژن، اشباع و مقدار مول هیدروژن پرداخته شد. نتایج حاصل بدین صورت بود که فشار جزئی هیدروژن و کربن‌دی‌اکسید با گذشت زمان در طول فرآیند ذخیره‌سازی تحت هر شرایط دمایی کاهش می‌یابد و در مقابل فشار جزئی متان افزایش می‌یابد که در نهایت منجر به کاهش فشار کلی مغار می‌شود. متان تولید شده در سطح تماس بین هیدروژن و کربن‌دی‌اکسید باعث کاهش سرعت واکنش مصرف‌شدن هیدروژن و مانع تولید ناخالصی شده و مانند گاز بالشتک عمل می‌کند. به‌صورت کلی مغارهایی با دمای بالا باتوجه‌به بالابودن نرخ واکنش و میزان اختلاط منجر به کاهش تا 16% کیفیت هیدروژن می‌شوند و انتخاب مغارهایی با دمای پایین‌تر مطلوب‌تر است. 

کلیدواژه‌ها


عنوان مقاله [English]

Investigating the Computational Fluid Dynamics of Temperature Impact on Underground Hydrogen Storage in Carbon Dioxide-Containing Salt Caverns

نویسندگان [English]

  • Milad Asghari 1
  • Behnam Sedaee 2
1 Institute of Petroleum Engineering, School of Chemical Engineering, College of Engineering, University of Tehran, Iran
2 Institute of Petroleum Engineering, School of Chemical Engineering, College of Engineering, University of Tehran, Iran\Underground Hydrogen Storage Core, University of Tehran, Iran
چکیده [English]

The global warming has made mankind›s need for clean energy more vital. Hydrogen has been the focus of researchers as a clean fuel in recent decades, and recently, extensive studies are being conducted to find suitable solutions for maximizing the efficiency of this fuel. Moreover, salt caverns formed by the dissolution of salt domes are recognized as one of the most important geological structures for medium-term and secure hydrogen storage. The presence of various impurities poses challenges to the storage operations, with carbon dioxide being a potential impurity. In this study, the effect of temperature on various parameters including changes in salt cavern pressure, partial pressures of components, hydrogen quality, saturation, and hydrogen molar quantity was investigated using a computational fluid dynamics approach. Ultimately, the results indicated that the partial pressures of hydrogen and carbon dioxide decrease over time under any condition, while the partial pressure of methane increases, ultimately leading to a decrease in overall cavern pressure. Methane produced at the interface between hydrogen and carbon dioxide reduces the rate of hydrogen consumption reaction and produces impurities, acting like a cushion gas. Generally, caverns with higher temperatures result in up to a 16% decrease in hydrogen quality due to increased reaction rates and mixing levels, making caverns with lower temperatures more desirable.

کلیدواژه‌ها [English]

  • Underground Hydrogen Storage
  • Salt Caverns
  • Carbon Dioxide
  • Methane Formation Reaction
  • Computational Fluid Dynamics
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