بررسی پایداری دراز مدت مغار نمکی به منظور ذخیره سازی هوای فشرده

نوع مقاله : علمی-پژوهشی

نویسندگان

1 کارشناسی ارشد،گروه مهندسی معدن، دانشکده فنی و مهندسی، دانشگاه تربیت مدرس، تهران

2 استاد، گروه مهندسی معدن، دانشکده فنی و مهندسی، دانشگاه تربیت مدرس، تهران

3 دانشجوی دکتری، گروه مهندسی معدن، دانشکده مهندسی معدن، نفت و ژئوفیزیک، دانشگاه صنعتی شاهرود، شاهرود

چکیده

ذخیره‌سازی هوای فشرده یکی از روش‌های ذخیره‌سازی انرژی است. مهم‌ترین قسمت سیستم ذخیره‌سازی هوای فشرده، مخزن ذخیره‌سازی است. در این تحقیق رفتار و پایداری بلندمدت مغار نمکی به عنوان محل ذخیره‌سازی هوای فشرده بررسی شد. بر اثر ساخت و بهره‌برداری از مغار نمکی، شرایط تنش برجا در اطراف مغار تغییر کرده و باعث ایجاد اختلاف تنش برجا در اطراف مغار می‌شود. اختلاف فشار بین تنش برجا و فشار درون مغار باعث همگرایی مغار و آسیب‌هایی در اطراف آن می‌شود. در این تحقیق از سنگ‌ نمک گنبد نمکی نصرآباد واقع در اطراف کاشان برای آزمایش خزش استفاده‌ شد. برای بررسی رفتار خزشی سنگ نمک، آزمایش خزش در سه سطح تنش به ‌صورت پلکانی انجام شد. پارامترهای مدل رفتاری لابی 2 (LUBBY 2) محاسبه شد. با استفاده از نرم‌افزار المان محدود LOCAS مغار شبیه‌‌سازی و رفتار و پایداری آن بررسی شد. نتایج آزمایش‌ها و مدلسازی مشخص کرد که با افزایش تنش در هر مرحله شیب قسمت ثانویه خزش افزایش یافته، می‌توان نتیجه گرفت با افزایش تنش ضریب ویسکوزیته ماکسول کاهش یافته است. مغار شبیه‌سازی شده آهنگ افت حجم 68/0 درصد سالیانه دارد و میزان جابه‌جایی در قسمت نیمه پایین مغار بیشتر از قسمت نیمه بالایی مغار بوده است. سقف مغار تمایل حرکت به سمت پایین و کف مغار تمایل حرکت به سمت بالا داشته است. ضریب ایمنی مغار بر اساس معیار اتساع دوریس نیز با افزایش عمق، کاهش و احتمال اتساع در دیواره مغار افزایش یافته است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation of the Long-Term Stability of Salt Rock Cavern for Compressed Air Storage

نویسندگان [English]

  • A. Alishavandi 1
  • M. Ahmadi 2
  • K. Ghoshtasbi 2
  • A. Askari 3
1 M.Sc, Dept. of Mining, Faculty of Engineering, Tarbiat Modares University, Tehran, Iran
2 Professor, Dept. of Mining, Faculty of Engineering, Tarbiat Modares University, Tehran, Iran
3 Ph.D Student, Faculty of Mining, Petroleum & Geophysics Engineering, Shahrood University of Technology, Shahrood, Iran
چکیده [English]

Compressed air storage is one of the methods of energy storage. One of the most important parts of a compressed air storage system is the storage cavern. In this study, the behaviour and the long-term stability of the salt cavern as a storage site for compressed air were investigated. Due to the construction and operation of the salt cavern, the in-situ stress conditions around the cavern will change. The difference between induce stress and pressure of compressed air will cause the cavern to converge and damage around it. In this study, the salt rocks from one of the regions of Iran were used to test creep. To investigate the creep behavior of salt rock, creep test was performed in three stress levels in a stepwise manner. Lubby2 model parameters were calculated. Then, using LOCAS finite element software, the compressed air storage cavern was simulated and its behavior and stability were investigated. The results of these experiments and modelling have shown that with increasing stress in each stage, the slope of the secondary part of the creep increases. Therefore, it can be concluded that with increasing stress, the Maxwell viscosity coefficient decreases. In addition, the amount of movement in the lower half of the cavern was more than the upper half of it. Value of the cavern safety factor according to the Devries dilation criterion also decreased with increasing depth and the probability of dilation in the cavern wall increased.

کلیدواژه‌ها [English]

  • Compressed air storage
  • Salt cavern
  • Creep
  • LUBBY2 creep model
  • LOCAS software

مراجع

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سابقه مقاله

  • تاریخ دریافت: 18 خرداد 1401
  • تاریخ بازنگری: 28 آذر 1401
  • تاریخ پذیرش: 14 شهریور 1401

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