| 摘要 |
PURPOSE:To contrive to improve the heat exchange efficiency by a structure wherein a burner is provided at the lower part of a plurality of water tubes located concyclically and baffle plates with holes, through which the respective water tubes pass, are provided at a water tube section located above the burner in a multi-tubular heat exchanger. CONSTITUTION:A plurality of water tubes 3 are concyclically installed in upright positions. A plurality of cylindrical baffles 6, each of which has number of through holes 7 tightly fixed onto the water tubes 3 and the remaining through holes 7', each having a diameter larger than the diameter of the water tube 3, are provided above a burner. As a result, high temperature combustion gas delivered from the burner passes through the through holes 7', resulting in heat- exchanging with the water tubes 3 and prolonging the retention time of combustion gas in a combustion chamber for the period of time after passing through the baffle 6 at the first stage to that arriving at the baffle 6 at the second stage before passing through the baffle 6 at the second stage. Consequently, because part of the baffles are heat-exchanged while receiving the thermal absorption of the baffles, the improvement of the heat exchange efficiency is contrived. |
