| 摘要 |
<P>PROBLEM TO BE SOLVED: To relieve thermal stress generated in a can body cover of a boiler. <P>SOLUTION: In an outside water pipe row 8, an outside vertical fin 11 is not arranged in an upper end part, and an outer row communicating part 12 is arranged. Exhaust gas is radially derived from the upper end part of the outside water pipe row 8 via this outer row communicating part 12. This exhaust gas is exhausted from a flue 23 via the can body cover 16. The can body cover 16 is formed in a cylindrical shape having a hollow peripheral side wall, and is connected to an upper pipe gather 3 and a midway part of the outside water pipe row 8 in its inner peripheral surface upper part. <P>COPYRIGHT: (C)2009,JPO&INPIT |
