| 摘要 |
The boiler is constructed as a water tube boiler in which the heat exchanging surfaces are tube spirals (11). The boiler is preferably cylindrical, and the flues are of annular shape as seen from above. The space inside the innermost tube spiral is used as a by-pass channel in the boiler. The by-pass channel (13) is constructed so that it also functions as an absorption sound damper. In order to improve the sound damping efficiency, the damper can be provided with an additional damping cylinder (15, 16, 23). A spark breaker (17) is arranged as a support structure for the additional damping cylinder. A channel (18) extending into the boiler is shaped so that it conducts all exhaust gases to the sound damping by-pass channel (13) when a regulating means (12) on top of the sound damper is in open position. Also the flow in the convection section (21) is indirectly regulated by means of the same regulating means (12). |
