Low pressure drop vanes for burners and NO.sub.X ports
AssigneeThe Babcock & Wilcox Company
InventorsGeorge B. Watson, Woodrow A. Fiveland
Life of this patent
Estimating the term…
Abstract
A vane assembly defining a flow passage for gas moving in a flow direction has at least one spin vane in the flow passage, positionable at an angle with respect to the flow direction. The vane is made of-sheet material and has a leading portion which is perforated. This reduces pressure drop across the vane while still maintaining spin of the gas.
Claims17
A vane assembly for a dual air zone NO.sub.x port assembly, comprising:
- means for defining an annular flow passage for gas moving in a flow direction;
- at least one spin vane in the annular flow passage positionable at an angle to the flow direction, the spin vane being made of flat sheet material and having a leading portion which is perforated with a plurality of perforations, the perforations occupying approximately 1/3 of a length of the at least one spin vane in the flow direction;
- and
- means for rotating the at least one spin vane between approximately 0.degree. and approximately 90.degree. to the flow direction.
A spin vane for positioning at an angle to a flow direction in a flow passage of a burner, the spin vane comprising a fiat sheet material member having a leading section in the flow direction which is perforated with a plurality of perforations, the perforations occupying approximately 1/3 of a length of the spin vane in the flow direction.
A burner arrangement for a boiler having means for defining a flow passage for combustion gas moving in a flow direction;
- means for supplying a fuel for burning with the combustion gas;
- at least one spin vane in the flow passage positionable at an angle to the flow direction, the spin vane being made of flat sheet material and having a leading section with respect to the flow direction which is perforated with a plurality of perforations, the perforations occupying approximately 1/3 of a length of the at least one spin vane in the flow direction;
- and means for rotating the at least one spin vane between approximately 0.degree. and approximately 90.degree. to the flow direction.
Dependencies are inferred from the claim text.