Abstract: The capital and operating costs of oil burners comprising rotary air compressors are reduced by using compressors that are lubricated with the fuel oil of the burner. Preferably, the fuel oil has the qualities and flow properties of fuel oil No. 2, and the compressor does not require the peripheral equipment of self-contained lubricating systems, e.g. lube oil storage tank, cooling coils, cooling coils fan, etc.

Abstract: Flue gas is captured from an emissions stack and recirculated to a burner by an induced flue gas recirculation system comprising: a mixing assembly for mixing combustion air and recirculated flue gas into a substantially homogeneous mix; a burner assembly for mixing and combusting the combustible mix with a fuel to produce a flue gas; an injection assembly, connected to and downstream from the mixing assembly and connected to and upstream from the burner assembly, for receiving the combustible mix from the mixing assembly and injecting it with the combustible fuel into the burner assembly; a combustion chamber connected to and downstream of the burner assembly for containing the combustible mix and flue gas; an emissions stack connected to and downstream from the combustion chamber for venting the flue gas from the combustion chamber; recirculating means for recirculating a portion of the flue gas from the emissions stack to the mixing assembly; and a purge assembly connected to the recirculating means for re