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Article
Investigation of factors affecting the efficiency of carbon dioxide removal in single perforated sieve tray column

Authors: Sarmad Foad Jaber --- Yuosif M. Abdul wahab --- Sami M. Zboon
Journal: Journal of Petroleum Research & Studies مجلة البحوث والدراسات النفطية ISSN: 22205381 Year: 2011 Volume: 136 Issue: 3 rd Pages: 35-43
Publisher: Ministry of Oil وزارة النفط

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Abstract

An experimental work was carried out for the recovery of carbon dioxide in monoethanolamine solution (MEA) using pilot plant of perforated sieve tray column. The effect of MEA concentration, carbon dioxide ratio in the gas phase, liquid flow rate, gas flow rate and CO2 loading in the absorption solution was investigated. The results show that the efficiency of recovery increased by increasing the concentration of MEA and better removal efficiency can be achieved by increasing the liquid flow rate and the contact time between CO2 and the absorbent and that can be happened by decreasing the air flow rate.


Article
Prediction Of The Efficiency Of Sieve Tray Using Air-Water System

Authors: Muhannad Abdul Razaq Hassan --- Adil A. Al-Hemiri
Journal: Journal of Engineering مجلة الهندسة ISSN: 17264073 25203339 Year: 2006 Volume: 12 Issue: 4 Pages: 941-956
Publisher: Baghdad University جامعة بغداد

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Abstract

This investigation deals with the effect of weir height, liquid and gas flow rate on tray efficiency. The tests were carried out on a single pass cross flow tray of air-water system of 0.3 m diameter for clear liquid height over sieve tray with weir height 3, 4 and 5 cm.Point efficiency values were found to be in the same range for different weir height, but it improves slightly with weir height. And the average values of point efficiency were 83 % for 3 cm weir height, 85 % for 4 cm weir height and 89 % for 5 cm weir height. While, point efficiency of 90 % was obtained for 5 cm weir height and liquid flow rate ranging between 5.8 to 7.32 m3/s. In the range of clear liquid height over hole diameter ( hL/dH) between 2 to 10, increasing the Reynolds number ranging between 2.0*105 to 1.6*106 for gas phase increases point efficiency.Prediction of Murphree (Tray) efficiency using Lopez and Castells (1999) equation shows that the ratio of EMV/Ep is equal to 1, due to low value of calculated Peclet number (degree of liquid mixing), which ranged between 0.07 to 1.5.

درس هذا البحث تاثير تغير كل من إرتفاع السد و جريان السائل و الغاز على إرتفاع السائل فوق الصينية المنخلية و كفائتها لنظام هواء-ماء. يزداد ارتفاع السائل فوق صينية اختبار واحدة ذات قطر0.3 متر وعدد فتحات 213 فتحة و ارتفاع سد3 و4 و5 سم بزيادة جريان السائل بين 0.12 الى 0.58 متر مكعب ساعة ويقل مع زيادة جريان الغاز من 35 الى 100 متر مكعب ساعة. كانت قيم الكفاء ة النقطية متقاربة لكنها تتحسن قليلا مع زيادة ارتفاع السد . وكانت معدلاتها مع ارتفاع السد هي 83% لارتفاع سد3 سم و85% لارتفاع سد 4 سم و 89% لارتفاع سد 5 سم . في حين اعلى قيمة للكفاءة النقطية كانت 90% لارتفاع سد 5 سم و جريان ماء بين 8.5 و 7.32 م3 / ثا . كذلك زيادة عدد رينولدز للطور الغازي يزيد من الكفاءة النقطية للصواني المنخلية في حالة كون نسبة إرتفاع السائل إلى قطر ثقب الصينية تتراوح بين 2 إلى 10. تم تخمين كفاءة ميرفري للصينية باستخدام معادلة لوبيز و كاستلز (1999) والتي اشارت إلى إن نسبة كفاءة ميرفري إلى الكفاءة النقطية كانت تساوي واحد بسبب إنخفاض قيم عدد بكلت للسائل والتي تراوحت بين 0.07 و 1.5.


Article
Prediction of the Point Efficiency of Sieve Tray Using Artificial Neural Network

Authors: Firas N. Hassan --- Adil. A. Al-Hemiri عادل احمد عوض
Journal: Iraqi Journal of Chemical and Petroleum Engineering المجلة العراقية للهندسة الكيمياوية وهندسة النفط ISSN: 19974884/E26180707 Year: 2009 Volume: 10 Issue: 4 Pages: 57-62
Publisher: Baghdad University جامعة بغداد

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Abstract

An application of neural network technique was introduced in modeling the point efficiency of sieve tray, based on a data bank of around33l data points collected from the open literature.Two models proposed,using back-propagationalgorithm, the first model network consists: volumetric liquid flow rate (QL), F foctor for gas (FS), liquid density (pL),gas density (pg), liquid viscosity (pL), gas viscosity (pg), hole diameter (dH), weir height (hw), pressure (P) and surfacetension between liquid phase and gas phase (o). In the second network, there are six parameters as dimensionless group: Flowfactor (F), Reynolds numberfor liquid (ReL), Reynolds numberfor gas through hole (Reg), ratio of weir height to hole diqmeter (hw/dH), ratio of pressure of process to atmosphere pressure (P/Pa), Weber number (lTe).Statistical analysis showed that the proposed models have an average absolute relative enor (AARE) of 9.3% and standard deviation (SD) of 9.7%forfirst model, AARE of 9.35% and SD of 10.5%for second model and AARE of 9.8%and SD of 7.5%for the third model.

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