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Article
Thermo- economic analysis of inlet air cooling in gas turbine plants in Basrah(Al-Rumaila gas turbine power plant case study)
تحليل حراراي - اقتصادي لتبريد الهواء الداخل لمحطات القدرة الغازية في البصرة ( محطة القدرة الغازية في الرميلة كحالة دراسية)

Author: Hussien S. Sultan
Journal: University of Thi-Qar Journal for Engineering Sciences مجلة جامعة ذي قار للعلوم الهندسية ISSN: 26645564/26645572 Year: 2016 Volume: 7 Issue: 1 Pages: 58-66
Publisher: Thi-Qar University جامعة ذي قار

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Abstract

In the hot regions the demand on electricity increased in the hot months. Gas turbine power plant is a good solution for this problem, since it has low cost, low time of installation and stable with electricity grid variation. But the power output of gas turbine is affected by the ambient temperature, the power decrease by 18% when the ambient temperature increase to 40oc. Inlet air cooling methods are used to boost the power losses in the hot days. In the present study a thermally and economically analysis was performed for Al-Rumaila gas turbine power plant located in Basrah (south of Iraq). The plant consist from five units and each unit designed to generates 296MW.The results shows that, the maximum decrease in the power developed due the increase in ambient air temperature reaches 22.97% during the month of July. The percentage of power saving due inlet air cooling increased with increasing the ambient air temperature.

في المناطق ذات المناخ الحار يزداد الطلب على الطاقة الكهربائية في الاشهر الحارة. تعتبر محطات القدرة الغازية حل جيد لهذه المشكلة, لان كلفة انشائها منخفضة , الوقت اللازم لتشييدها قصير ومستقرة مع التغيرات الحاصلة في الشبكة الكهربائية. لكن القدرةالمنتجة من المحطات الغازية تتأثر كثيرا بدرجة حرارة المحيط الخارجي, حيث تنخفض القدرة بمقدار 18% عندما ترتفع درجة حرارة المحيط الخارجي الى 40 درجة مئوية. تستخدم طرق متعددة لتبريد الهواء الداخل للمحطات الغازية من اجل تعزيز القدرة الخارجة منها. في هذه الدراسة تم تطبيق تحليل حراري اقتصادي لمحطة قدرة غازية في محافظة البصرة جنوب العراق. المحطة تحتوي خمس وحدات والقدرة التصميمية لكل وحدة هي 296 ميكاواط. اثبتت النتائج ان اعظم هبوط للقدرة المنتجة بسسبب ارتفاع درجة حرارة المحيط الخارجي يصل 22.97% خلال شهر تموز. النسبة المئوية للتوفير في القدرة بسسبب تبريد الهواء الداخل تزداد مع ارتفاع درجة حرارة المحيط الخارجي.


Article
THERMO-ECONOMIC IMPACT FROM USING EXHAUST GASES HEAT LOST FOR POWERING AN ABSORPTION REFRIGERATION SYSTEM USED FOR INLET AIR COOLING OF COMPRESSOR

Authors: Hussam T. Khrebish --- Hussien S. Sultan
Journal: KUFA JOURNAL OF ENGINEERING مجلة الكوفة الهندسية ISSN: 25230018 Year: 2019 Volume: 10 Issue: 3 Pages: 114-133
Publisher: University of Kufa جامعة الكوفة

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Abstract

The heat lost from gas turbine power plants with exhaust gases represents the most important source for lowering its thermal efficiency. Also, the thermal efficiency of gas turbine can be affected significantly by the ambient surrounding temperature. In Basrah, a lot of gas turbine units have been installed during the last period. In this study, the thermal-economic impact of the heat lost from gas turbine power plant (GTPP) to the atmosphere for different ambient temperature is studied. Heat recovery system is used, the heat recovery system is an absorption refrigeration system used for cooling the air inlet to the gas turbine cycle. For combined system gas turbine-refrigeration cycle, the performance and economic analysis are performed. The results shows that as, the output power and thermal efficiency are decreased by 0.97 MW and 0.0726% respectively for each unit temperature rise of the ambient temperature. The used of the absorption chiller would increase the output power by 23.3%. Also, the thermal efficiency increased by 23.35%.


Article
Thermo-economic Impact from Using Exhaust Gases Heat Lost for Power Generation

Authors: Dr. Hussien S. Sultan --- Hussam T. Khrebish
Journal: Basrah Journal for Engineering Science مجلة البصرة للعلوم الهندسية ISSN: Print: 18146120; Online: 23118385 Year: 2019 Volume: 19 Issue: 1 Pages: 1-11
Publisher: Basrah University جامعة البصرة

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Abstract

The heat lost from gas turbine power plants with exhaust gases represents the most important source for lowering its thermal efficiency. Also, the gas turbine thermal efficiency affected significantly with the ambient surrounding temperature. Al-Najybia gas-turbine power plant in Basrah, Iraq is choosing as a case study. The power plant consists of four units with a capacity of 125 MW for each unit. In the present study, all the calculations are performed for one unit only. Firstly the thermal impact is studied in terms of energy analysis for Al-Najybia gas turbine power plant (GTPP) for different ambient temperature for twelve months. Also, the economic loss a companied the heat lost with exhaust gases for different ambient temperature are estimated. Secondly, the thermo-economic improvement from coupling the GTPP with a heat recovery system is studied. For gas-steam combined cycle, the performance and economic analysis are performed. The results show that, the output power and thermal efficiency are decreased by 0.97 MW and 0.0726% respectively for each unit temperature rise of the ambient temperature. For the combined gas-steam power plant the percentage increasing of the thermal efficiency is approximately 46.4%. The results indicate the combined cycle power plant (CCPP) is very important to increase electrical capacity. From the economic analysis, the economic gain due


Article
Effectiveness of film cooling process on flat plate using multi-rows of cooling
فعالية عملية التبريد الغشائي على صفيحة مستوية باستخدام صفوف تبريد متعددة

Authors: Ahmed K. Al Shara --- Hussien S. Sultan --- Haitham M. Bachi
Journal: University of Thi-Qar Journal for Engineering Sciences مجلة جامعة ذي قار للعلوم الهندسية ISSN: 26645564/26645572 Year: 2015 Volume: 6 Issue: 3 Pages: 43-53
Publisher: Thi-Qar University جامعة ذي قار

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Abstract

Film cooling process is one of the most important external cooling methods used for gas turbine blades. In the present study the effectiveness of multi – row film cooling process on flat plate was estimated. Three rows of film cooling were considered with three configurations which are: simple injection angle with uniform cooling holes distribution, compound injection angle with uniform cooling holes distribution and staggered distribution for film cooling holes with simple injection angle. The simulation of the three cases were performed for different Reynolds number under real operating conditions. Gambit – Fluent package was used for the numerical simulation. Three dimensional incompressible turbulent flow with k – Ɛ model for turbulence was used for the simulation. The results show that, the staggered distribution for the film cooling holes gives the best for effectiveness the cooled surface.

تعد عملية التبريد الغشائي واحدة من اهم عمليات التبريد الخارجي المستخدمة في ريش التوربين الغازي. تم في هذه الدراسة تحديد فعالية عملية تبريد غشائي لصفيحة مستوية. استخدمت ثلاثة صفوف تبريد مرتبة بثلاث طرق هي: زاوية حقن بسيطة مع توزيع منتظم لثقوب التبريد, زاوية حقن مركبة مع توزيع منتظم لثقوب التبريد وتوزيع متخالف لثقوب التبريد مع زاوية حقن بسيطة. تم التمثيل النظري لهذه الطرق الثلاث باستخدام قيم مختلفة لرقم رينولدز تحت ظروف تشغيل حقيقية. تم الحل العددي لهذه الحالات الثلاث باستخدام الحقيبة البرمجية فلونت .التمثيل العددي تم بفرض جريان ثلاثي البعد, لا انضغاطي ومضطرب مع استخدام الموديل الرياضي k-Ɛ لنموذج الاضطراب. بينت النتائج ان فعالية التبريد الافضل كانت لحالة التوزيع المتخالف لثقوب التبريد.

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Article
PREDICTION OF HEAT TRANSFER CHARACTERISTICS FOR FORCED CONVECTION PIPE FLOW USING ARTIFICIAL NEURAL NETWORKS

Authors: Khalid B. Saleem --- Imad A. Kheioon --- Hussien S. Sultan
Journal: KUFA JOURNAL OF ENGINEERING مجلة الكوفة الهندسية ISSN: 25230018 Year: 2019 Volume: 10 Issue: 3 Pages: 73-89
Publisher: University of Kufa جامعة الكوفة

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Abstract

This paper investigates the ability of utilizing the artificial neural network (ANN) in calculating the forced convection characteristics coefficients from internal flow of air inside a pipe subjected to constant heat flux. The heat transfer characteristics such as Nusselt number (Nu), Stanton number (St) and friction factor (f) which are calculated using the empirical correlations have high deviation from that obtained from the experiments. So, the ANN method is proposed for predicting these characteristics coefficients more close to the experimental results. The training and testing data for optimizing the ANN structure are based on the experimental data obtained from the experiments performed on a forced convection apparatus. Three training algorithms for the training of the ANN were used and the presented ANN is implemented by using such MATLAB program. For the preferable ANN structure acquired in the current work, an acceptable mean square error was achieved for the training and test data, using the Trainlm algorithm. The results reveal that the estimated results are very close to the experimental data. Also, a new Graphical User Interface (GUI) is implemented for the application of ANN in the calculation of the attempted heat transfer parameters.

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