Numerical Simulation of Natural Gas Pipeline in Dense and Hybrid Phases

Document Type : Original Article

Authors
Moslem Abrofarakh 1
Mortaza Zivdar 2
Davod Mohebbi-Kalhori 3
1 Ph.D. Student, Department of Chemical Engineering, Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Iran
2 Professor, Department of Chemical Engineering, Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Iran
3 Associate Professor, Department of Chemical Engineering, Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Iran
20.1001.1/jgt.2024.2040645.1047
Abstract
Transmission of natural gas via pipelines is predominantly employed due to its cost-effectiveness compared to other methods. Transportation of natural gas through pipelines faces several challenges, such as high energy consumption, significant pressure drops, and two-phase flow problems. In this study, the transmission of natural gas in dense, hybrid (regions of dense phase and near-dense phase), and vapor phases was investigated to address some of these limitations. Additionally, mathematical models of quadratic forms for the pressure drop in the dense phase and hybrid modes, in terms of the diameter, mass flow, and length of the pipeline, were proposed. According to the models, the pipeline diameter had a more significant effect on the pressure drop than the flow rate and pipeline length. Moreover, the results showed that the energy consumption of the heat exchanger for the hybrid mode was 35% less than the dense phase. On average, the densities in dense phase and hybrid modes were 2.5 times higher than the two-phase flow. The pressure drop and velocity in the dense phase and hybrid modes were 2.2 times less than the two-phase conditions. In the dense phase and hybrid modes, the capacity of the pipeline for natural gas transmission increased by 52% compared with two-phase gas transmission.

Keywords

Subjects

Article Title Persian

شبیه سازی عددی خط لوله گاز طبیعی در فازهای متراکم و ترکیبی

Authors Persian

مسلم ابروفراخ 1
مرتضی زیودار 2
داود محبی کلهری 3
1 دانشجوی دکتری، گروه مهندسی شیمی، دانشکده مهندسی، دانشگاه سیستان و بلوچستان، زاهدان، ایران
2 استاد، گروه مهندسی شیمی، دانشکده مهندسی، دانشگاه سیستان و بلوچستان، زاهدان، ایران
3 دانشیار، گروه مهندسی شیمی، دانشکده مهندسی، دانشگاه سیستان و بلوچستان، زاهدان، ایران
Abstract Persian

 انتقال گاز طبیعی از طریق خطوط لوله به دلیل مقرون‌به‌صرفه بودن نسبت به سایر روش‌ها به‌طور گسترده مورد استفاده قرار می‌گیرد. با این حال، حمل گاز طبیعی از طریق خطوط لوله با چالش‌هایی مانند مصرف بالای انرژی، افت فشار قابل‌توجه و مشکلات جریان دو‌فازی مواجه است. در این مطالعه، انتقال گاز طبیعی در فازهای متراکم، ترکیبی (مناطق فاز متراکم و نزدیک به فاز متراکم) و دو فازی برای کاهش برخی از این محدودیت‌ها مورد بررسی قرار گرفت. علاوه بر این، مدل‌های ریاضی با فرم درجه دوم برای افت فشار در فاز متراکم و حالت ترکیبی بر اساس قطر، جریان جرمی و طول خط لوله پیشنهاد شدند. بر اساس این مدل‌ها، قطر خط لوله تأثیر بیشتری بر افت فشار نسبت به دبی و طول خط لوله داشت. نتایج همچنین نشان داد که مصرف انرژی مبدل حرارتی برای حالت ترکیبی ۳۵ درصد کمتر از فاز متراکم است. به‌طور متوسط، چگالی در فازهای متراکم و ترکیبی ۵/۲ برابر بیشتر از جریان دو‌فازی حاصل شد. افت فشار و سرعت در فازهای متراکم و ترکیبی ۲/۲ برابر کمتر از شرایط جریان دو‌فازی به دست آمد. همچنین، ظرفیت خط لوله برای انتقال گاز طبیعی در فازهای متراکم و ترکیبی ۵۲ درصد بیشتر از انتقال گاز در شرایط دو‌فازی محاسبه شد.

Keywords Persian

فاز متراکم
حالت هیبریدی
خط لوله
گاز طبیعی
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Journal of Gas Technology
Volume 9, Issue 1 - Serial Number 12
September 2024
Pages 50-66