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Article
Capture of CO2 from power plants Using Different Adsorbent materials
التقاط CO2 من محطات توليد الطاقة باستخدام مواد مازة مختلفة

Author: Abdulbasit H. Mhdi عبدالباسط حسن مهدي
Journal: kirkuk university journal for scientific studies مجلة جامعة كركوك - الدراسات العلمية ISSN: 19920849 / 26166801 Year: 2016 Volume: 11 Issue: 1 Pages: 245-258
Publisher: Kirkuk University جامعة كركوك

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Abstract

Emission of carbon dioxide from power plant has direct effect to increase the warm of earth due to combustion of fossil fuels by power plants. Pressure swing adsorption is an economic process used to control CO2 emission to atmosphere. In the present study single column of 1m length and 2.54 cm inside diameter used to study the breakthrough time curve of CO2/N2 separation using zeolite (13X), carbon molecular sieve (CMS), and activated carbon (AC). The range of adsorption pressure was (1-3) bar at ambient temperature and product flowrate of about 0.5 ml/min. The results showed significant separation of CO2 and low level of CO2 observed in the product line of the adsorber column. Longtime of breakthrough curve observed by zeolite 13X. Regeneration of Zeolite 13X by heating at 350 Co for 12houre increased breakthrough time from 70 minutes to 175 minutes. Maximum purity of the CO2 at the vacuum pump product line was 87% and Zeolite 13X was better than others in spite of steeper mass transfer zone observed by activated carbon adsorbent.

انبعاث غاز ثاني اوكسيد الكاربون من محطات توليد الطاقة له تأثير مباشر في ارتفاع درجة حرارة الارض نتيجة استخدام الوقود العضوي من قبل محطات توليد الطاقة. ضغط الامتزاز المتناوب هي عملية اقتصادية استخدمت للسيطرة على انبعاث ثاني اوكسيد الكاربون الى الجو. في هذه الدراسة عمود منفرد بطول 1 م و قطر داخلي 2.54 سم استخدم لدراسة زمن منحني الاختراقية لفصل CO2/N2 باستخدام زيولات 13X , جزيئات الكاربون المنخلي و الكاربون المنشط. مدى ضغط الامتزاز كان (1-3) بار عند درجة حرارة المحيط و معدل جريان الناتج حوالي 0.5ml/min. النتائج بينت فصل كفوء لـ ـ CO2 و لوحظ انخفاض تركيز CO2 في خط الناتج لعمود الامتزاز. أطول فترة لمنحني الاختراقية لوحظ من قبل زيولات 13X. اعادة تنشيط زيولايت 13X بواسطة التسخين عند درجة Co350 لـمدة 12 ساعة ادت الى زيادة زمن منحني الاختراقية من 70 دقيقة الى 175 دقيقة . اعلى نسبة لـ ـ CO2 عند خط الناتج للمضخة الفراغية كانت 87% و زيولايت 13X كانت الافضل بالمقارنة مع الاخريات بالرغم من ان منحني الاختراقية للكاربون المنشط كان اكثر اقترابا من الحالة المثالية.


Article
Study the Behavior of Long Spiral Tube Adsorber for Oxygen Separation from Air
دراسة تصرف انبوب الامتزاز الملفوف الطویل لفصل الاوكسجین من الھواء

Authors: Zaid A. Abdel-Rahman --- Abdulbasit H. Mhdi --- Ahmed J. Ali
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2013 Volume: 31 Issue: 17 Part (A) Engineering Pages: 3371-3381
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Single long spiral tube column (25 mm diameter, and 4 m bed length) had beenconstructed to study the separation of oxygen from air using commercial 13Xzeolite. The effect of adsorption pressure on the system breakthrough curves wasstudied. Single column with initial air pressurizing simulates the work of 2-columns, 4-steps PSA process, whereas single column with initial intermediatepure oxygen pressurizing simulates the work of 2-columns, 6-steps PSA processwith pressure equalization steps of the two columns. No significant effect ofpressure on the product oxygen purity is noticed when pressure increased from 2 to5 bar in both cases.For initial air pressurizing case, the average maximum effluent oxygen purity of88% is obtained. The range of zeolite loading capacity is q=0.25-0.35 mole N2/kgzeolite, and only 40% of the range has been utilized before breakthrough time.Whereas for initial oxygen pressurizing case, the maximum oxygen purity of 95%is obtained. The range of zeolite loading capacity is q=0.39-0.87 mole N2/kgzeolite, and 95% of the range has been utilized before breakthrough time, whichagree well with the equilibrium data of multicomponent Langmuir adsorptionequation.


Article
Parametric Study for Nitrogen Separation from Air by Pressure Swing Adsorption Using Carbon Molecular Sieve

Authors: Zaid A. Abdel-Rahman --- Abdulbasit H. Mhdi --- Heba S. Auob
Journal: Tikrit Journal of Engineering Sciences مجلة تكريت للعلوم الهندسية ISSN: 1813162X 23127589 Year: 2016 Volume: 23 Issue: 2 Pages: 1-9
Publisher: Tikrit University جامعة تكريت

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Abstract

The separation of air by carbon molecular sieve (CMS) adsorption was studied in this work over a range of adsorption pressure of (2–8) bar. Breakthrough curves showed no significant effect of the pressure on product nitrogen purity and adsorbent capacity above 4 bar. Maximum purity of about 98% is observed for time up to 60 s. Adsorbent capacity obtained is in agreement with multicomponent Langmuir isotherm up to 4 bar. Maximum constant adsorbent capacity of about 0.1 mol O2/kg CMS is obtained for pressure above 4 bar. For PSA two columns 6-steps process, no significant effect of the pressure on the product purity above 4 bar. The purity increases with decreasing the productivity. Maximum purity of 97.6% is obtained at productivity of 156 lit/kg CMS.hr, cycle time of 100 s, and purge flowrate of 1 lit/min. The productivity of 606 lit/kg CMS.hr is obtained at purity of 94%, cycle time of 60s, and purge flowrate of 4 lit/min.

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