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Article
EFFECT OF HOT CORROSION ON BOILERS PIPES IN NORTH BAGHDAD ELECTRIC POWER PLANT STATION
تأثير التآكل الساخن على أنابيب المراجل محطة شمال بغداد لتوليد الطاقة الكهربائية

Authors: Anees A. Khadom --- Ahmed A. Fadhil --- Abdul Mun’em A. Karim --- Hongfang Liu
Journal: DIYALA JOURNAL OF ENGINEERING SCIENCES مجلة ديالى للعلوم الهندسية ISSN: 19998716/26166909 Year: 2015 Volume: 8 Issue: 4 Pages: 776-784
Publisher: Diyala University جامعة ديالى

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Abstract

The high temperature external corrosion of boiler pipes was evaluated using weight loss technique. Samples of low carbon steel were supplied from north of Baghdad thermal station and used in current study. Locally supplied fuel ash was used as corrosion environment. Corrosion rates were determined as a function of time in the absence and presence of fuel ash. The results showed that the corrosion of boiler steel pipes was higher in the presence of fuel ash. Scanning electron microscope was also used to study the morphology of surface.

في هذا البحث تمت دراسة التآكل الساخن للجزء الخارجي لأنابيب المراجل البخارية باستخدام تقنية الفقدان بالوزن. تم استخدام نماذج للحديد الكاربوني من محطة شمال بغداد لتوليد الطاقة الكهربائية و أيضا تم استخدام رماد موقعي من المحطة كوسط تآكل. تم إيجاد معدلات التآكل بوجود و عدم وجود الرماد. حيث أظهرت الدراسة أن التآكل يزداد بوجود الرماد. و تم استخدام الطرق المجهرية لغرض دراسة التغيرات التي تطرأ على سطح المعدن.الكلمات الدالة: التآكل, درجة الحرارة العالية, الحديد منخفض الكاربون, رماد الوقود, المرجل


Article
HYDROGEN PURIFICATION USING A MICROPOROUS HYDROTALCITE-SILICA COMPOSITE MEMBRANE

Authors: Ahmed Daham Wiheeb --- Abdul Mun’em A. Karim --- Taif Emad Mohammed --- Mohd Roslee Othman
Journal: DIYALA JOURNAL OF ENGINEERING SCIENCES مجلة ديالى للعلوم الهندسية ISSN: 19998716/26166909 Year: 2015 Volume: 8 Issue: 4 Pages: 846-854
Publisher: Diyala University جامعة ديالى

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Abstract

A novel thin microporous composite membrane of a dual-element hydrotalcite-silica was prepared on porous alumina support by sol-gel method. Strong CO2 adsorption on hydrotalcite material inhibited the diffusion of H2 through the membrane and decreased H2 permeances significantly so that CO2 preferentially permeated. The effects of pressure difference across the membrane, operating temperature and CO2 feed concentration on the CO2 separation performance of the membrane were investigated using synthetically mixed gas. The CO2 permeance and CO2/H2 separation selectivity decreased with increasing the temperature due to the loss of the membrane ability for CO2 adsorption with temperature. Further increase of the pressure difference across the membrane decreased both CO2 permeance and CO2/H2 separation selectivity. The CO2 feed concentration with 40% showed the best performance with a CO2/H2 separation selectivity of 10.59.

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