QUADRANGULAR TYPE MULTI-TUBE ONCE-THROUGH BOILER

摘要

A quadrangular type multi-tube once-through boiler having an arrangement in which a feed path for combustion air, a combustion chamber, and an exhaust gas channel passing through a flue are aligned in substantially the same plane, and provided with a burner duct and a blower each installed in any desired regions in outer wall portions defining the width of the boiler body. The boiler body comprises an assembly of a plurality of substantially vertically disposed water tubes, so that combustion gas flows crosswise of the water tubes. A burner is disposed in close adjacency to the first row of water tubes the water tube assembly, whereby even if fuel from the burner is ignited in a space between the first row of water tubes and the burner, actual combustion does not proceed to completion therebetween but the most of the unburnt gas burns completely while it flows through water tube clearances.