| 摘要 |
PURPOSE:To effectively transfer combustion heat without burning a fire combustion means and a heat exchange part so as to prevent incomplete combustion by providing block-shaped or column-shaped radiators disposed in a gas- permeable manner between heat transfer tubes of a first heat transfer tube group and/or at the downstream in the vicinity thereof and a second transfer tube group disposed at the downstream in the vicinity of the radiators. CONSTITUTION:Block-shaped or column-shaped radiation elements are disposed between heat transfer tubes of a first heat transfer tube group and/or at the downstream in the vicinity thereof in a combustion gas permeable manner. Each of the block-shaped or column-shaped radiators are preferably made from a heat-resisting material such as silicon carbide, silicon nitride, ceramics such as cordierite or the like, or heat-resisting steel. The second heat transfer tube group is disposed at the downstream in the vicinity of heat transfer tube group 21. The block-shaped radiation element 20 emits radiant heat to both the first heat transfer group 19 and the second heat transfer group 21 disposed in a zigzag manner. The radiator 20 has a configuration of a spherical body, a cubic body, a rectangular parallelpiped, or a shape analogous thereto such as a golf ball or a Rugby ball.
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