FLUE STRUCTURE FOR EXHAUST HEAT RECOVERY DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an exhaust heat recovery device wherein combustion exhaust gas has conventionally a low flow rate in the case that a flow path in an annular flue has a larger cross section, and a heat exchange amount is greater between water flowing in a water pipe and the high temperature combustion exhaust gas flowing in the outer periphery of the water pipe as the combustion exhaust gas has a higher flow rate, having higher heat recovery efficiency by improving the point that the low flow rate of the combustion exhaust gas flowing in the annular flue results in a smaller heat exchange amount, lower heat recovery efficiency of the exhaust heat recovery device and easy deposition of dust.

SOLUTION: The exhaust heat recovery device comprises a splitting flat plate for splitting the total length of the annular flue in at least two in the circumferential direction. The split annular flues are formed as series of split flues communicated with an exhaust gas outlet.

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