Hybrid System Analysis And Experimental Research Of ITSOFC

At present, the energy and environmental issues is increasingly serious. How to enhance the efficiency of energy utilization with low emission becomes significant issue of common concern for all the countries around the world. Solid oxide fuel cell is a clean and efficient energy conversion device which can meet the requirement. As an electrochemical power generation devices, SOFC has several advantages, such as higher efficiency, no noise, fuel flexibility and low pollution. In order to overcome the problems brought by high operating temperature while maintaining the advantages of SOFC, intermediate temperature SOFC (ITSOFC) is the main strain of the world SOFC R&D now. SOFC/GT hybrid system can make use of high temperature heat and unexhausted fuel of SOFC effectively and improve the efficiency greatly. Hybrid system is considered to be effective measures to solve the energy and environmental issues.In this paper, theoretical analysis and preliminary experimental research of ITSOFC were presented. On the basis of investigate and research, an electrochemical model of ITSOFC was carried out. Then the SOFC/GT hybrid system layout was designed, a steady model of system was developed after analyzing the composition and working principle of this system. Energy and exergy were used to analyze and evaluate the performance of this system. Parameters study was carried out to analyze the impact on the system performance of some important parameters such as current density, pressure, temperature difference. The experimental system was described at last; the preliminary experimental research was carried out.The results of this paper show that: SOFC/GT hybrid system is an efficient energy utilization system. In the case described in this paper, the electrical efficiency is 60.06%,the total energy efficiency is 78.47%,and the exergy efficiency is 71.68%. Air compressor consumes the most energy. The exergy destruction in SOFC and combustor is the highest. The impact on system of important parameters was analyzed. The results of theoretical analysis can be useful in design and application of SOFC hybrid system. Experimental results show that ITSOFC can achieve good performance when the operating temperature is relative low.