Novel Plan for Stripping Gas Recovery in Gas Dehydration Unit:  Techno-Economical Evaluation for Khark Petrochemical Company as A Case Study

Arman M. Abdehvand; Mahdi Haghi; Aminreza Ansari; Ebrahim Hoseinirad

doi:10.52716/jprs.v15i3.1098

المؤلفون

Arman M. Abdehvand Research and Development department, Khark Petrochemical Company, Khark Island, Bushehr, Iran.
Mahdi Haghi Research and Development department, Khark Petrochemical Company, Khark Island, Bushehr, Iran.
Aminreza Ansari Department of Chemical Engineering, Iran University of Science and Technology, Tehran, Iran.
Ebrahim Hoseinirad Research and Development department, Khark Petrochemical Company, Khark Island, Bushehr, Iran.

DOI:

https://doi.org/10.52716/jprs.v15i3.1098

الكلمات المفتاحية:

Dehydration, Stripping gas, Triethylene glycol, Regenerator, Aspen Hysys.

الملخص

يُعد وجود بخار الماء في الغاز الطبيعي من التحديات الكبيرة، لما يسببه من تآكل وانسدادات في الأنابيب وتقليل سعة النقل. لذلك تُعد عملية نزع الماء من الغاز خطوة أساسية لتقليل محتوى الماء والحد من هذه المشاكل. في هذه الدراسة، تم محاكاة وحدة نزع الماء في شركة خارك للبتروكيمياويات (KPC) التي تستخدم مادة ثلاثي إيثيلين غلايكول (TEG) كمجفف، وذلك باستخدام برنامج Aspen HYSYS v11.0. وتتمثل أهمية هذا البحث في اقتراح طريقة محسّنة لاسترجاع الغاز المتبخر المستخدم في عملية تجديد محلول الغلايكول، حيث جرى تقييمها بشكل شامل من الناحية الفنية والاقتصادية. وقد جرى التحقق من صحة نتائج المحاكاة من خلال مقارنتها مع بيانات مخطط تدفق العمليات (PFD) في المصنع. كما أجري تحليل حساسية لتحديد أثر عدد من المتغيرات على أداء وحدة نزع الماء وكفاءة الغاز الجاف المنتج. وأظهرت النتائج أن زيادة معدل دوران المذيب، ومعدل تدفق غاز التجريد، ودرجة حرارة الغلاية تؤدي إلى تحسين معدل إزالة الماء. كما تم تقييم عدة خيارات لاسترجاع ما يقارب (0.7) مليون متر مكعب قياسي من غاز التجريد من برج التجديد عن طريق رفع ضغط التشغيل، مع تقدير النفقات الرأسمالية والتشغيلية لكل خيار. وقد تبين أن الخيار الأمثل هو إعادة توجيه الغاز المسترجع إلى ضاغط الغاز المغذي منخفض الضغط، حيث بلغت الكلفة الرأسمالية المقدرة له نحو (80,000 دولار) وفق برنامج Aspen ICARUS، إضافةً إلى حساب التكاليف الإضافية كنسبة من كلفة المعدات. ويسهم هذا الخيار في منع هدر الغاز وتحويله إلى ميثانول بتكلفة تشغيلية تقارب (67,000 دولار)، مما يحقق إيرادات سنوية تصل إلى (1.7 مليون دولار). كما أن كمية الانبعاثات التي تم تقليلها عبر استرجاع الغاز تعادل نحو (48 طن من ثاني أكسيد الكربون يومياً).

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