| 摘要 |
PROBLEM TO BE SOLVED: To provide a latent heat recovery type combustion device, for example, that including an exhaust gas collection cylinder capable of reducing noise of a combustion exhaust gas without using a sound absorber, that including an exhaust gas collection cylinder capable of reducing noise of a combustion exhaust gas at low costs, and the like.SOLUTION: A combustion device 1 includes: a sensible heat recovery heat exchanger 7 recovering sensible heat of a combustion gas; a latent heat recovery heat exchanger 8 recovering latent heat of a combustion exhaust gas; and an exhaust collection cylinder 10 disposed at a downstream side of the latent heat recovery heat exchanger 8 and discharging the combustion exhaust gas after heat exchange by the latent heat recovery heat exchanger 8, to a front part. An exhaust gas introducing portion 31 of the exhaust gas collection cylinder 10 includes: an exhaust passage expanding portion 32 communicated with an exhaust port 14 formed above the latent heat recovery heat exchanger 8; and exhaust passage contracting means 33 disposed in a state of covering a top face of the exhaust passage expanding portion 32. |
