With the development of the world economy, countries begin to pay attention to the transformation from rapid development to energy conservation and environmental protection. Although the proportion of clean energy power generation in the current power industry is gradually increasing, fossil energy power generation still occupies an unshakable position, so the development of fossil energy power generation towards clean and efficient has become an important issue. Some special industries, such as the marine industry, have low efficiency and high emission of power generation equipment, but they have complete diesel storage equipment, fuel is basically fixed, which provides a foundation for the marine industry diesel power generation system innovation. Fuel cell as a fourth-generation power generation technology has attracted much attention, especially solid oxide fuel cell (SOFC), which has a higher operating temperature than other types of fuel cells, making it more tolerance to impurities and high electrochemical reaction rate. At the same time, SOFC can be applied to hydrocarbon fuels other than H2, and fuel selection is more flexible because the electrolytes of SOFC deliver oxygen ions rather than protons. In this paper, three diesel-fueled SOFC systems have been established, which treat diesel with autothermal reforming, steam reforming and chemical looping hydrogen generation (CLHG) respectively. In this study, the three systems have the same input parameters, such as the temperature, pressure and composition of the diesel fuel entering the system; The operating conditions of the system are the same, such as the operating temperature and pressure of SOFC. Under the condition that the input parameters are the same, the variable working condition analysis, energy analysis and exergy analysis are carried out for the three systems, and the performance parameter curve of the three systems with the input parameters changed and the exergy damage ratio diagram of all parts of the three systems under the fixed working condition are obtained. Meanwhile, the research results of the three systems are compared. The results show, the SOFC of diesel steam reforming can generate the most power, however, diesel steam reforming needs heating furnace to provide heat for it, while the other two ways of treating diesel can be self-heating. CLHG-SOFC system has the lowest power, but it can separate CO2 without energy consumption, so it has more development prospects from the perspective of environmental protection. The research results not only provide theoretical basis and scientific support for the design of SOFC power generation system based on diesel fuel, but also provide a new scheme for energy saving optimization of power generation system.

Thermodynamic Performance Study of Diesel-Fueled SOFC Power Generation System

Paper Proceedings: https://asmedigitalcollection.asme.org/IMECE/IMECE2021/volume/85543

ASME 2021 International Mechanical Engineering Congress and Exposition (IMECE2021)

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