| 摘要 |
PROBLEM TO BE SOLVED: To provide a fluid heating apparatus provided with a premixing burner, in which a thermal load of a high temperature section is small, even if the apparatus is miniaturized to eliminate the possibility of burning loss, and production of NOx is suppressed. SOLUTION: Heat transfer pipe group 12, 14 are disposed in a housing 3, and a premixing burner 1 is provided between a combustion chamber 8 and a mixing chamber 9. A cooling pipe 24 is provided in a gap 23 between a first porous plate 21 serving as a burner slit and a lower second porous plate 22, through which a fluid to be heated before supplied to the heat transfer pipe group 12 flows as a cooling fluid. Hereby, a premixed gas of combustible gas flowing into the combustion chamber 8 after passage through a small hole and a combustion assistant gas and atmosphere in the combustion chamber 8 is cooled, so that even when temperature of a combustion flame and combustion gas is lowered, burning loss of a high temperature section is prevented, to also reduce occurrence of thermal NOx. As an application of the fluid heating apparatus 2, if, for example, a cooling fluid circulating in a fuel cell for example is employed as a fluid to be heated, since warming of the fuel cell is rapidly advanced to produce rated electric power at an early stage. |
