Patent ID: 6035810
Filing Date: 2000-03-14
Classification: F23C,F23N,F24H

Abstract:
A boiler comprising:a) a combustor for combusting an air-gas fuel mixture and exchanging the heat of combustion therefrom with a heat exchange fluid; said combustor comprising a pair of spaced apart walls so shaped as to define a combustion chamber therebetween, each said wall being formed of a continuous hollow tube wound in a substantially concentric spiral, said walls being attached to each other in a manner so as to form said combustion chamber proximal the center of said spiral of each said wall, and each said hollow tube having an inlet end and an outlet end thereby to form a fluid passageway therebetween;b) an air gas fuel mixture nozzle and an ignition rod, each located proximal said combustion chamber;c) an air line for providing a flow of air to said combustion chamber;d) a gas line in flow communication with said air line for providing gas fuel to said combustion chamber in admixture with said air;e) means for measuring a property of the mixture of air and gas fuel, which property is characteristic of said mixtures combustibility and for sending a signal representative of the measurement taken;f) means for receiving said signal from said means for measuring a property of the mixture of air and gas fuel and for controlling the air to gas fuel ratio in response thereto;g) means for sensing the temperature of a fluid exiting said hollow tube and for sending a signal representative of said temperature; andh) air flow control means for receiving said signal from said means for sensing the temperature of a fluid exiting said hollow tube and for controlling the flow of air through said air line in response thereto.