Combustion catalyzing system for commercial grade fuels

In a combustion catalyzing system for commercial grade fuels, in which the combustion occurs in a burner or an engine, and which comprises a water reservoir, an air inlet conduit arranged to be immersed in the reservoir water to cause air to bubble through the water in the reservoir, a vapor entraining air outlet conduit extending from the reservoir upper portion to a combustion supporting air pipe leading to a combustion zone, a humidistat located at said combustion zone and arranged to detect the vapor content in the combustion supporting air entering the combustion zone, a flow control valve disposed on the said outlet conduit and operated by the said humidistat to control the vapor flow in the said outlet conduit, the improvement wherein it further comprises a flow-regulating oil-controlled device containing oil and having an adjustable oil content level and located on the said outlet conduit downstream of the said control valve, said oil-controlled device having means for adjusting said oil content level therein and means defining a passage through said oil for said vapor flow, the length of said passage depending upon said oil content level whereby the vapor-entraining air flowing through the said outlet conduit is controlled both by said oil-controlled device and by the said flow-control valve both in response to the oil content level in said oil-controlled device and in response to the humidity content in the said combustion supporting air respectively and is caused controllably to bubble through said oil in said flow regulating device in response to a suction effect of said burner or engine.