Premixer with diluent fluid and fuel tubes having chevron outlets
a technology of diluent fluid and fuel tube, which is applied in the direction of machines/engines, lighting and heating apparatus, combustion types, etc., can solve the problems of reducing combustion temperature, reducing the efficiency of combustor, and prone to flashback of premixing devices, so as to reduce the efficiency of combustor, and enhance the flame holding margin
Inactive Publication Date: 2014-05-29
GENERAL ELECTRIC CO
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Benefits of technology
The patent describes an apparatus for creating turbulence in fuel flow. It includes a fuel source, a fuel tube, and a chevron outlet. The apparatus also has an air source and an air directing component that directs air into an air tube surrounding the fuel tube. The technical effect is the creation of a more turbulent fuel flow and a smoother air flow.
Problems solved by technology
Such premixing tends to reduce combustion temperatures and undesirable NOx emissions.
However, premixing devices are susceptible to flashback.
Similarly, the flame may develop on or near surfaces, which can also result in damage due to the heat of combustion.
In particular, an injection of a fuel flow into an air flow may cause a low velocity region near the injection point of the fuel flow, which can lead to flame holding.
Typically, it is difficult to control flame holding in premixing devices.
However, this results in a relatively high pressure drop across the combustor, thereby decreasing the combustor efficiency.
Method used
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[0032]FIG. 1 shows a premixer 10 as may be described herein. The premixer 10 may be used in a combustor (not shown) and in similar devices. The premixer 10 may include a fuel conduit 11 coupled to a fuel plenum 12. The fuel plenum 12 is in fluid communication with one or more fuel tubes 13. The fuel plenum 12 may have any desired size or configuration. Any number of fuel tubes 13 may be used herein. The fuel tubes 13 may have any desired size or configuration.
[0033]The premixer 10 also may include a burner tube 14. The burner tube 14 may include one or more air tubes 15 extending through the burner tube 14. Any number of the air tubes 15 may be used. The air tubes 15 may have any desired size or configuration. The air tubes 15 may extend from a bell mouth 16 facing the fuel plenum 12 to an opposite burner tube 14. The air tubes 15 may have a larger diameter as compared to the fuel tubes 13.
[0034]The fuel plenum 12 and the burner tube 14 may be separated by a number of spacers 18. An...
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A premixer includes an air tube formed in a burner tube defining a longitudinal axis, and a coaxially disposed fuel tube with a turbulence enhancing chevron outlet. The fuel tube may include an exterior tube and an interior tube with the interior tube, the exterior tube or both having chevron outlets. The chevron outlets may be tapered and notched.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is related to co-pending U.S. patent applications entitled “PREMIXER WITH FUEL TUBES HAVING CHEVRON OUTLETS”, Ser. No. ______, filed concurrently herewith.GOVERNMENT RIGHTS[0002]This invention was made with Government support under contract number DE-FC26-05NT42643 awarded by the Department of Energy. The Government has certain rights in this invention.TECHNICAL FIELD[0003]The subject matter disclosed herein relates to premixing devices for injection nozzles and more particularly to a premixer having coaxial fuel tube for enhanced mixing, flame holding and flashback resistance.BACKGROUND[0004]Gas turbine manufacturers are continuously improving the emission performance of gas turbines. The primary pollutant produced by gas turbines are oxides of nitrogen (NOx), carbon monoxide (CO) and unburned hydrocarbons. NOx emissions depend upon the maximum temperature in the combustor and the residence time for the reactants. One kn...
Claims
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Login to View More IPC IPC(8): F23R3/28
CPCF23C2202/10F23L7/00F23L2900/07002F23R3/286
Inventor UHM, JONG HOJOHNSON, THOMAS EDWARDZUO, BAIFANGSTEVENSON, CHRISTIAN XAVIER
Owner GENERAL ELECTRIC CO