Title: Boiler using combustible fluid

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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. Hot gas is diverted from these hot gas flow paths and flowed spirally of these flow paths along axially spaced flow paths immersed in the water circuit of the boiler to improve heat transfer. Liquid fuel is fed into the combustion chamber from a burner at the opening of the cover. The fuel is mixed with air to which a rotation has been imparted about the axis of the arrangement and entering the opening of the cover. The cover is jacketed and the jacket defines part of the inlet cold water circuit and the heated hot water circuit.


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