EVAPORATOR AND FUEL CELL SYSTEM USING THE EVAPORATOR

摘要

An object is to provide a highly-efficient evaporator capable of effectively avoiding reduction in steam generation efficiency due to the Leidenfrost phenomenon while maintaining a heating surface in a heating chamber for steam generation in a high-temperature region to be subjected to the influence of the Leidenfrost phenomenon by not reducing heating power required for heating the inside of the heating chamber from outside or not heat-insulating the heating chamber. To achieve this object, a sleeve-like sheet made of foamed nickel is disposed as a foamed member 64 containing metal as a principal component near a heating surface 69 and along an entire periphery of the heating surface 69 in a heating chamber 68 formed inside a pipe body 67 to be heated from the outside in such a manner as to contact the heating surface 69. While water supplied to the inside of the sleeve-like sheet passes through this inside, the water is diffused to permeate the surrounding sleeve-like sheet. Evaporation of the water is finished before the water reaches the heating surface 69.