generation unit that generates power through an electrochemical reaction of a first fuel and a first oxidant a reforming unit that supplies the first fuel to the power generation unit a heating unit that receives second fuel and a second oxidant combusts the second fuel and is thermal conductively coupled with the reforming unit and a connection unit that connects the heating unit with the power generation unit to be in fluid communication and supplies off gas of the power generation unit to the heating unit the off gas is supplied to the heating unit in a pulse type application_number US 78864310 A description reference will now be made in detail to the present embodiments of the present invention examples of which are illustrated in the accompanying drawings wherein like reference numerals refer to the like elements throughout the embodiments are described below in order to explain the present invention by referring to the figures however the described embodiments may be modified in various different ways all without departing from the spirit or scope of the present invention also in describing the embodiments well known functions or constructions will not be described in detail since they may unnecessarily obscure the understanding of the present invention in addition it will be appreciated that like reference numerals refer to like elements throughout even though they are shown in different figures further when a first element is described as being coupled to a second element the first element may be not only directly coupled to the second element but may also be indirectly coupled to the second element via a third element moreover when a first layer is provided on a.