| 摘要 |
The present invention refers to a water-tube boiler of direct flame, having a control and drought flow which is able to provide hot water and generate steam in a quick and efficient manner using at the maximum extent the combustion gases calories, this latter process being attained by the exchange of heat carried out by longitudinal inner tubes oriented in a tilted form for increasing the heating surface through which water flows and originates a natural entry of the cooler water by the lowest portion thereof, the tubes being located within a duct through which the combustion gases resulting from the combustion chamber are flown.
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