Analysis of a Solid Oxide Fuel Cell (SOFC) System Based on a Mass and Energy Flow Model

Solid oxide fuel cell (SOFC) power systems are known to be a promise alternative for power generation with high efficiency and fuel flexibility. The SOFC has been proved to be an excellent energy conversion device. In this paper, a mass and energy flow model is developed for a SOFC combined heat and power (CHP) system power generation system, which includes fuel/air supply system, SOFC stack, an afterburner and three heat exchangers. The model can analyze and measure how energy is transferred and transformed within each component of the system, as well as between different component of the system. This model provides a structured approach for understanding the complex processes of energy transfer and conversion and enables the optimum operating point to be obtained for different system output powers. Excessive air coefficient lambda
$(\lambda)$
is an important parameter in SOFC system that directly impacts fuel cell efficiency, fuel cell performance, and operating temperatures.