Importance

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Abstract

A pulsed combustion high capacity boiler has air inlet flapper valves at an inlet air decoupler toward a combustion chamber, with a fuel supply and an ignitor upstream of the combustion chamber along a flow path. The combustion chamber is immersed in a water jacket, and downstream of the combustion chamber a plurality of exhaust pipes are immersed in the water jacket and lead to an exhaust decoupler. The exhaust decoupler is disposed outside of the water at the periphery of the unit. An orifice assembly along the flow path defines a flow restriction producing turbulence and preferably serially combines a reduction in cross sectional area followed by a diverter having vanes to induce further turbulence. The ignitor and fuel supply are enabled by a controller that senses spark and combustion flame, and also enables a blower at least during a startup interval. The air inlet flapper admits air, opening and closing at a resonant frequency during combustion. At least the combustion chamber and the exhaust pipes are substantially enclosed in the water jacket and together define a water tank that can be part of a circulating water system. Inasmuch as the exhaust decoupler is mounted on the outer perimeter, preferably at the bell end of the boiler outside of the water jacket, the outermost wall at that end can be made of light sheet metal rather than heavy pressure-resistant plate. Due to the structure, the bell end need only withstand the pressure differential between the gaseous exhaust and ambient pressure.

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First Claim