CHARACTERISTICS OF A MCFC STACK WITH MULT IPLE TYPE CELLS

Multiple type cell structure which has four unit cells on the same pla ne has been devised in order to enlarge the electrode area over 1 m(2) . Before the development of 1 m(2) class multiple type cells, a stack of five cells with multiple type cell structure, each of which had tot al cell electrode area of 3600cm(2)(900cm(2) x 4), was constructed to study the characteristics of its structure. The temperature distributi on of the cell was studied and compared with that of a stack which had the same electrode area but with a single electrode structure. The te mperature distribution of the multiple type cell was found to be small er than that of the single electrode cell, and the measurement result showed good agreement with the simulation of the cell temperature dist ribution. A 25 kW class stack was constructed and operated. The stack was assembled with 22 cells of multiple type cell structure, each of w hich had electrode area of 12100cm(2) (3025cm(2) x 4), Output of 28.3 kW was obtained at current density of 150 mA/cm(2), and the stack was operated at stable cell voltage under the fuel utilization of 80%. it was shown that the multiple type cell structure was effective to enlar ge the electrode area over 1m(2).