US Patent No. 10,920,979

LOW NOX BURNER AND FLOW MOMENTUM ENHANCING DEVICE


Patent No. 10,920,979
Issue Date February 16, 2021
Title Low Nox Burner And Flow Momentum Enhancing Device
Inventorship Darton J. Zink, Tulsa, OK (US)
Rex K. Isaacs, Collinsville, OK (US)
John Petersen, Pawnee, OK (US)
Cody Little, Coweta, OK (US)
Tim Kirk, Morris, OK (US)
Assignee ZEECO, INC., Broken Arrow, OK (US)

Claim of US Patent No. 10,920,979

1. A burner apparatus comprising:a burner wall having a forward longitudinal end;
an air flow passageway, which extends through and is surrounded by the burner wall, for a combustion air stream comprising air or a mixture of air and fuel which travels through the air flow passageway, the air flow passageway having a forward discharge opening at the forward longitudinal end of the burner wall, and the forward discharge opening having an internal diameter or width; and
a flow momentum enhancing device having a longitudinal axis, a rearward longitudinal end, a forward longitudinal end, and a surrounding exterior surface which extends from the rearward longitudinal end to the forward longitudinal end of the flow momentum enhancing device,
the exterior surface of the flow momentum enhancing device having a maximum lateral outside diameter or width at a location which is rearward of the forward longitudinal end the flow momentum enhancing device and forward of the rearward longitudinal end of the flow momentum enhancing device,
the exterior surface of the flow momentum enhancing device having an outside diameter or width at the forward longitudinal end of the flow momentum enhancing device which is less than the maximum lateral outside diameter or width,
the exterior surface of the flow momentum enhancing device having an outside diameter or width at the rearward longitudinal end of the flow momentum enhancing device which is less than the maximum lateral outside diameter or width, and
the rearward longitudinal end of the flow momentum enhancing device being positioned in the air flow passageway, at the forward discharge opening of the air flow passageway, or forwardly of the air flow passageway so that a forward flow path going forwardly from the rearward longitudinal end to the forward longitudinal end of the flow momentum enhancing device is defined outside of the flow momentum enhancing device for a flow path stream which comprises all or a portion of the combustion air stream which travels through the air flow passageway,
wherein the forward flow path for the flow path stream travels over and in contact with the maximum lateral outside diameter or width of the exterior surface and then continues to travel along and in contact with the exterior surface from the location of the maximum lateral outside diameter or width to the forward longitudinal end of the flow momentum enhancing device such that, as the forward flow path for the flow path stream approaches the forward longitudinal end of the exterior surface, the exterior surface, and the forward flow path for the flow path stream traveling along and in contact with the exterior surface, converge inwardly with respect to the longitudinal axis of the flow momentum enhancing device, and
the maximum lateral outside diameter or width of the exterior surface of the flow momentum enhancing device is from 1.5 to 5 inches less than the internal diameter or width of the forward discharge opening of the air flow passageway.