| 摘要 |
A vertical steam or hot water boiler comprises a convection part and an aligned final combustion chamber. A flame tube passes centrally through the convection part, communicating at its lower end with the combustion chamber, and is provided with a burner at its upper end. An air preheating chamber is provided on top of the convection part, being separated from a turning chamber for the smoke gases by a common wall, a portion of said air preheating chamber extending towards the flame tube. The burner head is surrounded by a labyrinth formed by baffles, directing air form the air chamber to the burner.
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