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العنوان
Modeling of chemical-looping combustion of gaseous fuels /
المؤلف
Farag, Mostafa Hamdy El-Shahat Mohamed.
هيئة الاعداد
باحث / مصطفى حمدى الشحات محمد فرج
مشرف / فاروق محمد عكاشة
مشرف / أحمد عبدالسلام حجازى
مناقش / شادى عماد رفعت
الموضوع
Gas as fuel. Gases. Fluidized-bed combustion. Fossil fuels - Combustion.
تاريخ النشر
2018.
عدد الصفحات
116 p. :
اللغة
الإنجليزية
الدرجة
ماجستير
التخصص
الهندسة الميكانيكية
تاريخ الإجازة
01/04/2018
مكان الإجازة
جامعة المنصورة - كلية الهندسة - Mechanical Power Engineering
الفهرس
Only 14 pages are availabe for public view

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from 112

Abstract

Climate change is without a doubt one of the most important issues of our time, originating to a great extent from carbon dioxide emissions. Unfortunately burning fossil fuels is the main source of energy nowadays in our power plants and is considered the major contributor in the production of CO2 and other greenhouse gases as flue gases. These flue gases act like the glass walls of a greenhouse, they allow solar radiations to pass through and heat the surface of the earth, yet they do not allow the heat radiated from the ground to pass back through, thereby trapping it in the process and eventually resulting in global warming. Among all these gases, carbon dioxide has gained the most attention because 72% of the totally emitted greenhouse gases comprises of carbon dioxide (CO2). Different method presented to mitigate the concentration of CO2 emissions at the atmosphere such as reducing energy consumption by increasing energy utilization efficiency, switching to less carbon-intensive fuels and increasing the use of renewable energy sources but these technologies still need time to mature. Within these options and actions for mitigation of CO2 emissions, carbon capture and storage (CCS) has emerged as a viable option to achieve the very deep cuts in emissions that might be needed in the medium or short term. Carbon dioxide capture technologies can be classified into precombustion, oxyfuel combustion, and post-combustion. One promising option of CO2 capture for fossil fuels is chemical-looping combustion technology (CLC). The technology basis is to transfer oxygen from air to the fuel by means of a solid oxygen-carrier avoiding direct contact between fuel and air. It consists of two successive reactions, oxidation (air reactor) and reduction (fuel reactor), into two interconnected fluidized beds. CLC technology has shown good results in reducing CO2 emissions at the atmosphere. The objective of this study is to simulate the performance of the fuel-reactor using a mathematical model of bubbling fluidized bed. In this work copper (Cu) is chosen as the base oxygen carrier while methane (CH4) is the used fuel. The model incorporates both hydrodynamics and chemical kinetics to provide more reliable predictions. The main output of the model is the variation in gases concentration along the reactor height. The model has been validated against the model developed at institute of Carbochemistry (CSIC), Zaragoza, Spain.