Abstract: A low NOx burner system is disclosed that reduces the emission of CO and HC during cold furnace startups, minimizes NOx formation with preheated air, and provides a flat stable flame due to burner design improvements including three stage combustion. The burner system is designed to operate in either a low or high temperature mode by controlling the amount of combustion air provided to stage 1 and stage 2 combustion. The burner system is designed to heat the interior of a furnace for high-temperature combustion/furnace processes, such as aluminum melting and steel processes. The burner system can also be used for low temperature processes at temperatures below the auto-ignition temperature of the fuel and still produce very low CO, HC and NOx emissions.

Abstract: A burner assembly for lean, low NOx combustion may include a gaseous fuel manifold, counter-swirl vanes, and a converging nozzle with bluff body flame anchors. A cooling air tube optionally extends from the air inlet to the nozzle.

Abstract: A burner assembly for lean, low NOx combustion may include a gaseous fuel manifold, counter-swirl vanes, and a converging nozzle with bluff body flame anchors. A cooling air tube optionally extends from the air inlet to the nozzle.

Abstract: A low NOx burner system is disclosed that reduces the emission of CO and HC during cold furnace startups, minimizes NOx formation with preheated air, and provides a flat stable flame due to burner design improvements including three stage combustion. The burner system is designed to operate in either a low or high temperature mode by controlling the amount of combustion air provided to stage 1 and stage 2 combustion. The burner system is designed to heat the interior of a furnace for high-temperature combustion/furnace processes, such as aluminum melting and steel processes. The burner system can also be used for low temperature processes at temperatures below the auto-ignition temperature of the fuel and still produce very low CO, HC and NOx emissions.

Abstract: The present invention is an air-staged low NOx burner for firing a gaseous fuel. The burner fires three stages, with the first stage of combustion taking place substantially within a burner cup section of a refractory baffle, the second stage of combustion taking place adjacent to the baffle and downstream of the baffle, and the third stage of combustion within a furnace. The flow of main combustion air adjacent to the baffle creates a negative pressure zone adjacent to the baffle. The present invention is also a method for low NOx staged combustion.

Abstract: A swirl-type internal flame recirculation burner apparatus and method as used to fire asphalt plant aggregate dryers, air heaters and calcining kilns and method includes a compressed air oil atomizer assembly. The burning and swirling fuel and primary main combustion air mixture recirculates upstream along the burner axis. The secondary main combustion air may be swirled. The burner may also be fired on gas or a combination of gas and oil.

Abstract: A swirl-type internal flame recirculation burner apparatus and method as used to fire asphalt plant aggregate dryers, air heaters and calcining kilns and method includes a compressed air oil atomizer assembly. The burning and swirling fuel and primary main combustion air mixture recirculates upstream along the burner axis. The secondary main combustion air may be swirled. The burner may also be fired on gas or a combination of gas and oil.

Abstract: A combination burner for selectively firing oil, natural gas and liquid propane. A modular first section has primary and secondary air tubes coaxially arranged therein and communicates with the main combustion air supply fan. A modular section is joined by bolts or the like to the first section and into which the primary and secondary air tubes extend. A center air spin vane rack is upstream of the secondary air tube in the first section. An adjustable spin vane rack is located radially outwardly of the secondary air tube for selectively spinning the main combustion air for flame adjustability. An air diverter is provided at a downstream end of the primary air tube. A compressed air atomizer is also at the downstream end of the primary air tube.