A combustor end cap assembly having an improved cooling configuration is disclosed. Embodiments of the present invention are directed towards an apparatus and method for cooling an effusion plate of the combustor end cap assembly. The combustor end cap assembly also incorporates an impingement plate
A combustor end cap assembly having an improved cooling configuration is disclosed. Embodiments of the present invention are directed towards an apparatus and method for cooling an effusion plate of the combustor end cap assembly. The combustor end cap assembly also incorporates an impingement plate having a plurality of cooling holes with the impingement plate positioned a predetermined distance from the effusion plate. The cooling fluid passes through the impingement plate and is directed towards and onto the effusion plate for cooling of the effusion plate.
대표청구항▼
1. An end cap assembly for use in a combustion system comprising: a generally cylindrical sleeve;an effusion plate having a first plurality of cooling holes and a first plurality of premix tube holes, the effusion plate joined to an end of the cylindrical sleeve;an impingement plate having a second
1. An end cap assembly for use in a combustion system comprising: a generally cylindrical sleeve;an effusion plate having a first plurality of cooling holes and a first plurality of premix tube holes, the effusion plate joined to an end of the cylindrical sleeve;an impingement plate having a second plurality of cooling holes and a second plurality of premix tube holes, wherein the second plurality of cooling holes comprises a first portion and a second portion, the second portion of the second plurality of cooling holes having a larger diameter than the first portion of the second plurality of cooling holes, the second portion being located proximate a plurality of struts of the end cap assembly, the impingement plate joined to the cylindrical sleeve and oriented generally parallel to the effusion plate and spaced a first axial distance from the effusion plate;a plurality of premix tubes extending from proximate the first plurality of premix tube holes in the effusion plate and through the second plurality of premix tube holes in the impingement plate; and,wherein a supply of cooling fluid is directed through the second plurality of cooling holes in the impingement plate, onto the effusion plate, through the first plurality of cooling holes, and into a combustion liner. 2. The end cap assembly of claim 1, wherein the cylindrical sleeve extends a distance beyond the impingement plate. 3. The end cap assembly of claim 1, wherein the second plurality of cooling holes are oriented generally perpendicular to a surface of the impingement plate. 4. The end cap assembly of claim 3, wherein the first plurality of cooling holes are oriented at an angle relative to the second plurality of cooling holes. 5. The end cap assembly of claim 1, wherein the portion of the second plurality of cooling holes provide regions of increased cooling fluid to the effusion plate. 6. The end cap assembly of claim 1, further comprising a forward support structure positioned generally parallel to the impingement plate, spaced a second axial distance from the effusion plate, and fixed to the plurality of premix tubes, and a rear plate positioned generally parallel to the forward support structure and spaced a third axial distance from the effusion plate, the rear plate located adjacent to an end of the plurality of premix tubes opposite of the first plurality of premix tube holes. 7. The end cap assembly of claim 1 further comprising one or more seals extending about a perimeter of the cap assembly. 8. An end cap assembly comprising: an effusion plate having a first plurality of cooling holes and a first plurality of premix tube holes;an impingement plate having a second plurality of cooling holes and a second plurality of premix tube holes, wherein the second plurality of cooling holes comprises a first portion and a second portion, the second portion of the second plurality of cooling holes having a larger diameter than the first portion of the second plurality of cooling holes, the second portion being located proximate a plurality of struts of the end cap assembly, the impingement plate oriented generally parallel to the effusion plate and spaced a first axial distance from the effusion plate;a plurality of premix tubes extending from the first plurality of premix tube holes in the effusion plate and through the second plurality of premix tube holes in the impingement plate;a forward support structure positioned generally parallel to the impingement plate and spaced a second axial distance from the effusion plate, the forward support structure being fixed to the plurality of premix tubes;a generally cylindrical sleeve extending between the forward support structure and the effusion plate;the plurality of struts extend radially between a centermost premix tube and the cylindrical sleeve; and,a rear plate positioned generally parallel to the forward support structure and spaced a third axial distance from the effusion plate, the rear plate located adjacent to an end of the plurality of premix tubes opposite of the first plurality of premix tube holes;wherein a supply of cooling fluid is capable of being directed radially inward between the rear plate and the forward support structure, through the second plurality of cooling holes in the impingement plate, and onto the effusion plate for cooling the effusion plate. 9. The end cap assembly of claim 8, wherein the second plurality of cooling holes are oriented generally perpendicular to a surface of the impingement plate. 10. The end cap assembly of claim 9, wherein the first plurality of cooling holes are oriented at an angle relative to the second plurality of cooling holes. 11. The end cap assembly of claim 8, wherein the second axial distance is greater than the first axial distance. 12. The end cap assembly of claim 8 further comprising a flow shield that extends from the rear plate and is angled radially inward towards the plurality of premix tubes. 13. The end cap assembly of claim 8 further comprising one or more seals extending about a perimeter of the end cap assembly. 14. A method of cooling a combustion end cap assembly comprising: providing an end cap assembly having an effusion plate with a first plurality of cooling holes and a first plurality of premix tube holes, an impingement plate with a second plurality of cooling holes spaced about a perimeter of the impingement plate and adjacent a plurality struts of the end cap assembly and a second plurality of premix tube holes, wherein the second plurality of cooling holes comprises a first portion and a second portion, the second portion of the second plurality of cooling holes having a larger diameter than the first portion of the second plurality of cooling holes, the second portion being located proximate the plurality of struts of the end cap assembly;providing a plurality of premix tubes extending from the first plurality of premix tube holes and through the second plurality of premix tube holes, a forward support structure positioned generally parallel to the impingement plate, the forward support structure being fixed to the plurality of premix tubes, a generally cylindrical sleeve extending between the forward support structure and the effusion plate, the plurality of struts extend radially between a centermost premix tube and the generally cylindrical sleeve, and a rear plate positioned generally parallel to the forward support structure and proximate an end of the plurality of premix tubes;directing a supply of cooling fluid into the end cap assembly, around the plurality of premix tubes, and towards the impingement plate;directing the supply of cooling fluid through the second plurality of cooling holes in a direction perpendicular to a surface of the impingement plate; and,directing the supply of cooling fluid through the first plurality of cooling holes in a direction having an angle relative to a surface of the effusion plate. 15. The method of claim 14, wherein the supply of cooling fluid is directed radially inward between the forward support structure and the flow shield. 16. The method of claim 14, wherein the second plurality of cooling holes have a diameter greater than the first plurality of cooling holes.
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