Patent ID: 6969249

Claim:
A burner for selectively firing on at least oil comprising: an oil tube for supplying oil for combustion, the oil tube being associated with an oil supply; a compressed air tube for supplying compressed air at a pressure in the range of about 15 psig to about 100 psig for oil atomization and combustion, the compressed air tube being associated with a compressed air supply; a primary air passage for supplying primary main combustion air, for combustion, the primary air passage being associated with a main combustion air supply through a main combustion air inlet section, the main combustion air supply supplying main combustion air at a pressure in the range of about 22 osig to about 28 osig; a compressed air oil atomizer for atomizing oil, the compressed air oil atomizer being located at the downstream end of the primary air passage and nested within the primary air passage, the compressed air tube and compressed air oil atomizer being coaxial in at least a portion of the compressed air oil atomizer; a plurality of primary swirl vanes in fluid communication with the primary main combustion air so that the primary main combustion air exits the primary air passage with a swirl number above the critical swirl number of 0.6; a secondary air passage for supplying secondary main combustion air for combustion, the secondary air passage being associated with the main combustion air supply through a main combustion air inlet section and through a damper assembly, the primary air passage being nested within the secondary swirl passage; a secondary swirl vane assembly for swirling secondary combustion air, the secondary swirl vane assembly being positioned within the secondary air passage; a secondary air sleeve nested within the secondary air passage and; the main combustion air inlet section being associated with the main combustion air supply, the damper assembly being nested within the main combustion air inlet section, the damper assembly being adjustable for controlling the rate of flow of main combustion air through the damper assembly to the secondary air passage.