مدل سازی در مهندسی

مدل سازی در مهندسی

مدل‌سازی فنی - اقتصادی فرآیند خودسرمایشی پر بازده تولید گاز طبیعی مایع در ایستگاه‌های تقلیل فشار: مطالعه موردی نیروگاه شهید سلیمی نکا

نوع مقاله : مقاله پژوهشی

نویسندگان
دانشکده مهندسی مکانیک، دانشگاه شهید بهشتی، تهران، ایران
چکیده
میزان تقاضای گاز طبیعی به عنوان یک حامل انرژی پاک در ایران و جهان رو به افزایش است. خط لوله و مایع‌سازی گاز طبیعی دو روش اصلی انتقال گاز در جهان هستند. در حال حاضر در ایران خطوط لوله سراسری و گسترده جهت پاسخ به این تقاضا ایجاد شده است. اما امروزه سهم گاز طبیعی مایع (LNG) در تجارت انرژی در جهان رو به افزایش است. فشار گاز خط لوله در ایستگاه‌های تقلیل فشار(PRS) کاهش می‌یابد تا آماده مصرف شود. متعاقب این افت فشار ناگهانی بخشی از اگزرژی گاز تلف می‌شود. با استفاده از فرآیند خودسرمایشی علاوه بر بازیابی اگزرژی اتلافی در PRS، می‌توان بخشی از گاز طبیعی را مایع نمود. فرآیند خودسرمایشی نسبت به فرآیندهای مرسوم تولید LNG، مصرف برق پایین تر و پیچیدگی فرآیندی کمتری دارد. در این پژوهش یک فرآیند خودسرمایشی تولید LNG با به کارگیری تجهیز توربین انبساطی‌ بر اساس مشخصات ایستگاه تقلیل فشار نیروگاه نکا طراحی شده است. پس از یافتن نقاط ترمودینامیکی مناسب، ارزیابی اقتصادی با در نظر گرفتن واحدها و تاسیسات جانبی صورت پذیرفته است. در این مطالعه با بهره‌گیری از روش مطالعه پارامتریک، نرخ مایع‌سازی تا 6/27% بهبود یافته است. ضریب عملکرد سرمایشی، توان مشخصه و راندمان اگزرژی به ترتیب 68/0، 0/160 کیلو‌وات‌-ساعت بر تن و %8/61 در نقطه بیشینه مایع‌سازی تعیین شده است. همچنین بر اساس ارزیابی اقتصادی، بیشترین میزان نرخ بازده داخلی و کمترین زمان نقطه سربه‌سر به ترتیب 38% و 4/2 سال محاسبه شده است که در نقطه بیشینه مایع‌سازی محقق می‌شود.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Techno-Economic Modeling of the High-Efficient Self-Cooling Natural Gas Liquefaction System in Pressure Reduction Stations: a Case Study of Shahid Salimi Power Plant of Neka

نویسندگان English

ُSeyed Hossein Habibiannejad
Ali Jahangiri
Mohammad Ameri
Faculty of Mechanical and Energy Engineering, Shahid Beheshti University, Tehran, Iran
چکیده English

Today, the demand for natural gas (NG) as a low-emission energy carrier is on the rise. Simultaneously, the share of liquefied natural gas (LNG) as a method of gas transportation is also increasing. The high-pressure gas pipelines for urban gas supply, along with pressure reduction stations (PRSs), have expanded significantly in Iran over the past few years. In the PRS, the pressure energy of NG is lost. Therefore, LNG production using the self-cooling method in PRS (LPRS) is one solution to recover this energy and produce LNG simultaneously. This method requires attention due to very low electricity consumption and simplicity compared to other liquefaction methods. Replacing LPRS instead of PRS, in addition to creating a product sales market, can decrease energy waste in PRS. The feasibility of the plant construction requires both technical and economic evaluations. In this research, we have designed an LPRS process specifically for the Neka power plant. After identifying suitable thermodynamic points, an economic evaluation that considered the entire LNG production chain is conducted. In this study, through a parametric analysis, the liquefaction rate has achieved 27.6%. The coefficient of performance, specific power consumption, and exergy efficiency are 0.68, 160.0, and 61.8% at the maximum liquefaction point, respectively. Furthermore, the results of the economic study show that the highest IRR and the lowest break-even point are calculated as 38% and 2.4 years, which are realized at the maximum liquefaction point.

کلیدواژه‌ها English

Liquified Natural Gas (LNG)
Pressure reduction station (PRS)
Expander
Liquefaction rate (LR)
Economic sensitivity analysis
Internal Rate of Return (IRR)
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دوره 24، شماره 85
در حال تکمیل شدن
تابستان 1405
صفحه 99-119

  • تاریخ دریافت 25 شهریور 1403
  • تاریخ بازنگری 11 مرداد 1404
  • تاریخ پذیرش 27 مرداد 1404