| 摘要 |
The boiler 1, for burning solid granular fuel such as wood pellets, includes a base wall 11, a top wall 12 and side walls 13, 14 and 15 defining an enclosure 16 for hot gasses. At least a portion of the walls are hollow heat enclosures for carrying water to be heated. A burner 10 is also housed in the enclosure 16. A heat exchanger means 20 is mounted to an exhaust gas outlet 30 communicating with an exhaust gas flue 7. The heat exchanger means 20 may include at least one conduit and a vortex inducing baffle assembly 23 formed by spirally wound plate. The baffle may be a relatively loose fit and project through the conduit. Means 27, 28 may be provided to move the baffle back and forth within the conduit to clean the baffle. |
