Abstract: A heating boiler with a combustion chamber between a front wall, a rear wall and a convection part in each one of the side walls, a flue system composed of parallel flues of substantially circular cross-section arranged vertically in different cross-section planes through the boiler with at least two flues in each side wall in one and the same cross sectional plane, forming upwards or downwards passages for flue gases.

Abstract: Cast metal heat exchanger and mould therefor, in particular a fired central heating boiler operating on water or medium circulation, with two or more externally ribbed, hollow sections through which the water and about which the flue gases can flow, wherein the sections are cast integrally in sealed form at their end edges with sidewalls and end walls extending over the entire boiler length, except for the gas and water communication openings, on the side where the water and flue gas are present with respect to the outside atmosphere.

Abstract: A fluid fuel boiler having a combustion chamber having an opening for introducing a combustion supporting gaseous fluid. A burner introduces a liquid fuel into the combustion chamber mixed with the gaseous fluid for combustion thereof. Water-heating flow paths are disposed circumferentially and axially of the combustion chamber. Axial hot gas flow paths deliver hot gases from a downstream portion of the combustion chamber to a plurality of nozzles for diverting some of the hot gases along axially spaced paths in a direction circumferentially of the combustion chamber. These latter hot gas flow paths are immersed in the flow paths of the water to improve heat transfer.BACKGROUND OF THE INVENTIONThis invention relates generally to boilers and more particularly to a new and improved modular boiler.

Abstract: A wet base boiler of the multi-sectioned type, that is, a boiler in which the fire box is surrounded by water. Each heat exchanger section of the boiler being arranged and constructed to provide an improved heat transfer surface when contacted by the heated gases emanating from the fire box. The heat transfer surface of each section comprises opposing parallel walls having a plurality of equispaced ribs disposed thereon to define a curvilinear path between adjacent ribs, the ribs formed on one wall of a heat exchanger section being antisymmetrical with the ribs formed on the opposing wall of the heat exchanger section, each rib of each wall having spaced fins or cusps and each fin or cusp having a height so as to be spaced from the fins branching from the ribs of an adjacent heat exchanger section.

Abstract: A modular boiler having a cylindrical combustion chamber made of three modules and a module comprising a cover and a module comprising an expansion vessel mounted coaxially on the boiler adjacent the combustion chamber at opposite ends thereof. The cover has a frustro-conical configuration with the inner walls thereof diverging from an opening in the cover toward the interior of the combustion chamber at an angle of between 30.degree. and 110.degree.. The combustion chamber is formed of three castings that define the cylindrical combustion chamber and six axial hot gas flow paths spaced circumferentially from each other and disposed axially of and radially of the combustion chamber. Hot gases from the downstream end of the combustion chamber are recirculated to the upstream end of the combustion chamber to improve the combustion.

Abstract: A modular boiler having a cylindrical combustion chamber made of three modules and a module comprising a cover and a module comprising an expansion vessel mounted coaxially on the boiler adjacent the combustion chamber at opposite ends thereof. The cover has a frustro-conical configuration with the inner walls thereof diverging from an opening in the cover toward the interior of the combustion chamber at an angle of between 15.degree. and 55.degree.. The combustion chamber is formed of three castings that define the cylindrical combustion chamber and six axial hot gas flow paths spaced circumferentially from each other and disposed axially of and radially of the combustion chamber. Hot gases from the downstream end of the combustion chamber are recirculated to the upstream end of the combustion chamber to improve the combustion.

Abstract: A modular boiler having a cylindrical combustion chamber made of three modules and a module comprising a cover and a module comprising an expansion vessel mounted coaxially on the boiler adjacent the combustion chamber at opposite ends thereof. The cover has a frustro-conical configuration with the inner walls thereof diverging from an opening in the cover toward the interior of the combustion chamber at an angle of between 30.degree. and 110.degree.. The combustion chamber is formed of three castings that define the cylindrical combustion chamber and six axial hot gas flow paths spaced circumferentially from each other and disposed axially of and radially of the combustion chamber. Hot gases from the downstream end of the combustion chamber are recirculated to the upstream end of the combustion chamber to improve the combustion.