| 摘要 |
PROBLEM TO BE SOLVED: To prevent the occurrence of a combustion failure due to closing of nozzle holes even if high-humidity air in a latent heat recovery heat exchanger flows reversely to generate dew condensation in rich nozzles during operation stop in a heat source machine which includes a sensible heat recovery heat exchanger and the latent heat recovery heat exchanger heated by a burner unit configured to align a plurality of rich-lean burners, and in which lean nozzles 63 and rich nozzles 64 facing lean flow inlets and rich flow inlets of the rich-lean burners are provided in a gas manifold 6 supplying fuel gas to the burner unit.SOLUTION: In a gas manifold 6, a partition wall 68 separating a lean gas chamber 66 supplying fuel gas to lean nozzles 63 from a rich gas chamber 67 supplying fuel gas to rich nozzles 64 is provided. One or a plurality of communication portions 69 communicating the lean gas chamber with the rich gas chamber is formed in the partition wall 68. The fuel gas is supplied to the rich gas chamber 67 from the lean gas chamber 66 via the communication portions 69. Furthermore, a total area of openings of the communication portions 69 is set smaller than a total area of openings of nozzle holes of a plurality of rich nozzles 64. |
