| 摘要 |
PROBLEM TO BE SOLVED: To provide a boiler which can be configured in a compact manner even when having both a feed water heater and an air heater.SOLUTION: A boiler 1 includes: a feed water heater 60 arranged in an exhaust passage 50 and performing heat exchange between water circulating in a water supply passage 20 and combustion gas circulating in the exhaust passage 50; and an air heater 70 arranged on a further downstream side than the feed water heater 60 in the exhaust passage 50 and performing heat exchange between combustion air circulating in an air supply passage 30 and the combustion gas circulating in the exhaust passage 50. The exhaust passage 50 includes: a vertical exhaust passage part 50a arranged between a can body 10 and a blower 40 and extending vertically; and a horizontal exhaust passage part 50b extending from an upper end part of the vertical exhaust passage part 50a in a substantially horizontal direction and to the side on which the blower 40 is arranged. The feed water heater 60 is arranged in the vertical exhaust passage part 50a. The air heater 70 is arranged on a further can body 10 side than the position where the blower 40 is arranged in the horizontal exhaust passage part 50b in a top view. |
