ÖMER GENÇ

Determination of Ejector Performance for 4 KW SOFC System Through Geometrical Approach

Abstract

One of the important energy saving tools used in solid oxide fuel cells (SOFCs) are the ejector systems which are capable of the recirculating of the unused fuels and/or the exhaust gasses like hot steam (H2O) which is  necessary for  preventing of the carbon depositions and initiation of the reactions in reformers. In an ejector system developed for the SOFCs, the steam to carbon ratio (STCR) and entrainment ratio are the essential parameters for the determination of the ejector performance.  These parameters can be maximized by modifying the geometric dimensions and operation conditions (i.e. pressure and temperature). This study focuses on the determination of the maximum STCR value and entrainment ratio via the numerical analysis for a micro combined heat and power systems based on 18 kW (SOFC), using methane as fuel. A detailed procedure for the ejector designing is provided and its efficiency is investigated for different critical region dimensions (throat diameter, nozzle exit angle and nozzle position etc.). Results show that the nozzle positon and the nozzle exit angle largely affect the (STCR) and entrainment ratio. 4000 different design points are created to determine the optimum nozzle position and nozzle exit angle. Entrainment ratio and STCR are determined respectively as 6,8 and 2,59 for a specific design created in the study.

Biography

Omer GENC is a Research Assistant of Mechanical Engineering, Faculty of Engineering and Natural Science at Gumushane University, Turkey. O. GENC received his BSc degree in mechanical engineering from Omer Halisdemir University in Turkey in 2011. He continues his doctora degree education in mechanical engineering at Omer Halisdemir University. He has actively been working in the areas of renewable energy technologies (SOFC ,PEM Fuel Cell etc.).