| 摘要 |
<p>PURPOSE:To permit the reduction of the pitch of heat transfer tubes in a heat recovery section and improve heat recovery efficiency, by a method wherein a seave is provided in a flowing medium passing area above a partitioning wall and the width of a clearance around the circumference of a heat transfer surface for recovering heat, which is provided in the flowing medium of the heat recovery section, is formed so as to be equal to the diameter of the opening of the seave or wider. CONSTITUTION:Water tubes 21 support a partitioning wall 18 and serve as a seave at the inlet port upon introducing a flowing medium into a heat recovery chamber 22. The seave (screen) at the inlet port, which is constituted of the water tubes 21, is arranged in zigzag every other water tube and whereby the clogging of the screen by unburnt substances is prevented. The size of particles, which have passed through the screen and can enter the heat recovery chamber 22 from a combustion section 10, is smaller than the size of clearances between water tubes 21 constituting the seave. Accordingly, when the clearance between the heat transfer tubes 29 is formed so as to be larger than the space of the water tubes 21 of the seave for the inlet port, there is no possibility that the unburnt substances are clogging the gap between the heat transfer tubes 29 and the pitch of the heat transfer tubes 29 may be reduced. When the arrangement of the heat transfer tubes is designed so as to be a zigzag arrangement, there is no anxiety that the unburnt substances clog the tubes for heat recovery and the heat tubes may be compacted, therefore, there may be no problem with the title device.</p> |
