Patent Application
20180313541
A gas turbine generally comprises a compressor, a combustor, and a turbine, wherein the compressor provides compressed air generated by a plurality of compressor blades to a combustion chamber of the combustor through a plurality of swirler inlet cups and a hot gas generated by the compressed air in the combustion chamber is provided to the turbine. Even though the plurality of swirler inlet cups are placed in the different positions of the combustor, the plurality of swirler inlet cups have the same length and the same bell mouth. As a result, when the compressed air flows through the plurality of swirler inlet cups, the air-flow is separated and air pockets are formed in the swirler inlet cups. That is, the air-flow is not uniform in the swirler inlet cups and thus flame-holding events occur in the combustion chamber.
The present invention relates to a combustor for a gas turbine, more particularly, to a combustion system inhibiting non-uniform air-flow in a swirler inlet cup. In many embodiments, a combustion system according to the subject invention comprises a plurality of swirler inlet cups having different lengths, and in some embodiments the inlet cups may have different bell mouths.
In an embodiment of the present invention, a combustion system can include a first swirler inlet cup having a first length, and a second swirler inlet cup having a second length, wherein the first length of the first swirler cup is different from the second length of the second swirler inlet cup.
In another embodiment of the present invention, a combustion system can include a peripheral swirler inlet cup having a peripheral bell mouth, and a center swirler inlet cup having a center bell mouth, wherein the peripheral bell mouth and the center bell mouth are different from each other, and wherein a length of the peripheral swirler inlet cup is different from a length of the center swirler inlet cup.
In yet another embodiment of the present invention, a combustor can include a combustion chamber, a cap covering the combustion chamber, a plurality of first swirler inlet cups passing through the cap and having a first length and a first bell mouth, a plurality of second swirler inlet cups passing through the cap and having a second length and a second bell mouth, and a third swirler inlet cup passing through the cap and having a third length and a third bell mouth, wherein the first length is different from the third length, and wherein the first bell mouth is different from the third bell mouth.
When the terms “on” or “over” are used herein, when referring to layers, regions, patterns, or structures, it is understood that the layer, region, pattern, or structure can be directly on another layer or structure, or intervening layers, regions, patterns, or structures may also be present. When the terms “under” or “below” are used herein, when referring to layers, regions, patterns, or structures, it is understood that the layer, region, pattern, or structure can be directly under the other layer or structure, or intervening layers, regions, patterns, or structures may also be present. The terms “includes” and “including” are equivalent to “comprises” and “comprising”, respectively.
In addition, references to “first”, “second”, and the like (e.g., first and second portion), as used herein, and unless otherwise specifically stated, are intended to identify a particular feature of which there may be more than one. Such reference to “first” does not imply that there must be two or more. These references are not intended to confer any order in time, structural orientation, or sidedness (e.g., left or right) with respect to a particular feature, unless explicitly stated. In addition, the terms “first” and “second” can be selectively or exchangeably used for the members.
Furthermore, “exemplary” is merely meant to mean an example, rather than the best. It is also to be appreciated that features, layers and/or elements depicted herein are illustrated with particular dimensions and/or orientations relative to one another for purposes of simplicity and ease of understanding, and that the actual dimensions and/or orientations may differ substantially from that illustrated. That is, a dimension of each of the elements may be exaggerated for clarity of illustration, and the dimension of each of the elements may be different from an actual dimension of each of the elements. Not all elements illustrated in the drawings must be included and limited to the present disclosure, but the elements except essential features of the present disclosure may be added or deleted.
It is to be understood that the figures and descriptions of embodiments of the present invention have been simplified to illustrate elements that are relevant for a clear understanding of the invention, while eliminating (in certain cases), for purposes of clarity, other elements that may be well known. Those of ordinary skill in the art will recognize that other elements may be desirable and/or required in order to implement the present invention. However, because such elements are well known in the art, and because they do not facilitate a better understanding of the present invention, a discussion of such elements is not provided herein.
Reference will be made to the attached figures on which the same reference numerals are used throughout to indicate the same or similar components.
Each of the plurality of swirler inlet cups 600 is placed in different position of the inside of the case 500 and the head end 550, thus the compressed air in each of the swirler inlet cups 600 has different air-flow. However, the plurality of swirler inlet cups 600 have the same length and the same bell mouth, thereby air-flow non-uniformity occurs. In particular, when the compressed air flows through the plurality of swirler inlet cups 600, the air-flow is separated and air pockets are formed in the swirler inlet cups 600, thereby resulting in the formation of worse air-fuel mixing quality and flame-holding event in the combustion chamber 210.
The first swirler inlet cups 610 and the second swirler inlet cups 630 are placed in a peripheral region of the cap 400. Each of the first swirler inlet cups 610 includes a first tube 625 and a first bell mouth 620 disposed on a distal end of the first tube 625, wherein the first tube 625 has a first diameter 615 and a first length 617 of the first swirler inlet cups 610 is measured from a top surface of the cap 400 to the first bell mouth 620. Each of the second swirler inlet cups 630 includes a second tube 645 and a second bell mouth 640 formed on a distal end of the second tube 645, wherein the second tube 645 has a second diameter 635 and the second swirler inlet cups 630 have a second length 637 measured from the top surface of the cap 400 to the second bell mouth 640. When the first diameter 615 is larger than the second diameter 635, the first swirler inlet cups 610 are low swirler number (LSN) swirler inlet cups and the second swirler inlet cups 630 are high swirler number (HSN) swirler inlet cups. In this embodiment, the first length 617 of the first swirler inlet cups 610 is configured to be different from the second length 637 of the second swirler cups 630, thereby increasing air-flow uniformity in the first and second swirler inlet cups. In a particular embodiment, the first length 617 of the first swirler inlet cups 610 can be shorter than the second length 637 of the second swirler inlet cups 630.
The third swirler inlet cup 650 is placed in a center region of the cap 400. The third swirler inlet cup 650 includes a third tube 665 and a third bell mouth 660. In addition, the third swirler inlet cup 650 has a third diameter 655 of the third tube 665 and a third length 657 measured to the third bell mouth 660 from the cap 400. In this embodiment, the third length 657 is different from the first length 617 and the second length 637 in order to increase air-flow uniformity. In particular, the third length 657 is the longest, the first length 617 is the shortest, and the second length 637 is shorter than the third length 637 and longer than the first length 617. For example, the first length 617 is 108 mm, the second length 637 is 148 mm, and the third length 657 is 173 mm. However, alternative embodiments can have different numbers and the subject invention is not limited to lengths of a particular number or dimension. In addition, the third diameter 655 is smaller than the first diameter 615 and the second diameter 635. That is, the swirler inlet cups having a smaller diameter are designed to be longer than the swirler inlet cups having a larger diameter.
Referring to
In this embodiment, the first swirler inlet cups 610 and the second swirler inlet cups 630 are arranged alternately in the peripheral region of the cap 400, where three first swirler inlet cups 610 and three second swirler inlet cups 630 are arranged to surround the third swirler inlet cup 650 placed in the center region of the cap 400. As the first length 617 of the first swirler inlet cups 610 is shorter than the second length 637 of the second swirler inlet cups 630, the first bell mouth 620 of the first swirler inlet cups 610 can be overlapped with the second bell mouth 640 of the second swirler inlet cups 630 when viewed from a top of the cap 400. In addition, the first bell mouth 620 can be in contact with the second tube 645 of the second swirler inlet cups 630 or the third tube 665 of the third swirler inlet cup 650 because in this embodiment, the first length 617 of the first swirler inlet cups 610 is different from the second length 637 of the second swirler inlet cups 630 and the third length 657 of the third swirler inlet cup 650.
The subject invention includes, but is not limited to, the following exemplified embodiments.
A combustion system, comprising:
The combustion system according to embodiment 1, further comprising a cap covering a combustion chamber, wherein the first and second swirler inlet cups pass through the cap.
The combustion system according to embodiment 2, wherein the first length and the second length are determined from a top surface of the cap.
The combustion system according to any of embodiments 2-3, wherein a first diameter of the first swirler inlet cup is larger than a second diameter of the second swirler inlet cup.
The combustion system according to embodiment 4, wherein the first length is shorter than the second length.
The combustion system according to embodiment 5, further comprising a third swirler inlet cup having a third length and passing through the cap, wherein the third length is different from at least one of the first length and the second length.
The combustion system according to embodiment 6, wherein a third diameter of the third swirler inlet cup is smaller than the second diameter of the second swirler inlet cup and the third length is longer than the second length.
The combustion system according to embodiment 7, wherein the third swirler inlet cup is placed in a center region of the cap, and the first swirler inlet cup and the second swirler inlet cup are placed in a peripheral region of the cap.
The combustion system according to embodiment 8, wherein a first radius of a bell mouth of the first swirler inlet cup is different from a third radius of a bell mouth of the third swirler inlet cup.
A combustion system, comprising:
The combustion system according to embodiment 10, wherein a peripheral radius of the peripheral bell mouth is larger than a center radius of the center bell mouth.
The combustion system according to embodiment 11, further comprising a cap covering a combustion chamber, wherein the peripheral and center swirler inlet cups pass through the cap.
The combustion system according to embodiment 12, wherein the peripheral swirler inlet cup comprises a high swirler number (HSN) swirler inlet cup having a high bell mouth and a low swirler number (LSN) swirler inlet cup having a low bell mouth, and the center radius is different from at least one of a high radius of the high bell mouth and a low radius of the low bell mouth.
The combustion system according to embodiment 13, wherein the low radius is larger than the center radius and is the same as the high radius.
A gas turbine, comprising:
The gas turbine according to embodiment 15, wherein the second length is different from at least one of the first length and the third length.
The gas turbine according to embodiment 16, wherein a third radius of the third bell mouth is smaller than a first radius of the first bell mouth.
The gas turbine according to embodiment 17, wherein the third swirler inlet cup is placed in a center region of the cap, and a plurality of the first and second swirler inlet cups are alternately positioned to surround the third swirler inlet cup at a peripheral region of the cap.
The gas turbine according to any of embodiments 17-18, wherein the first, second, and third swirler inlet cups have different diameters, respectively.
The gas turbine according to any of embodiments 17-19, wherein the air is provided to the combustion chamber through the first, second, and third swirler inlet cups.
A gas turbine, comprising:
The gas turbine according to embodiment 21, wherein the plurality of swirler inlet cups comprises a first swirler inlet cup having a first length, a second swirler inlet cup having a second length, and a third swirler inlet cup having a third length.
The gas turbine according to embodiment 22, wherein the second length is shorter than the third length and longer than the first length.
The gas turbine according to embodiment 23, wherein the third swirler inlet cup is placed in a center region of the cap.
The gas turbine according to any of embodiments 22-24, wherein the first swirler inlet cup has a first bell mouth, the second swirler inlet cup has a second bell mouth, and the third swirler inlet cup has a third bell mouth.
The gas turbine according to embodiment 25, wherein a first radius of the first bell mouth is larger than a third radius of the third bell mouth.
The gas turbine according to embodiment 26, wherein a second radius of the second bell mouth is the same as the first radius of the first bell mouth.
The gas turbine according to any of embodiments 21-27, wherein air is provided to the combustion chamber through the plurality of swirler inlet cups.
The gas turbine according to any of embodiments 21-28, wherein a fuel is provided to the combustion chamber through the plurality of nozzles.
A combustion system, comprising:
The combustion system according to embodiment 30, wherein the peripheral diameter of the peripheral swirler inlet cup is larger than the center diameter of the center swirler inlet cup.
The combustion system according to any of embodiments 30-31, wherein the peripheral radius of the peripheral bell mouth is larger than the center radius of the center bell mouth.
The combustion system according to any of embodiments 30-32, further comprising a cap covering a combustion chamber, wherein the peripheral and center swirler inlet cups pass through the cap.
The combustion system according to any of embodiments 30-33, wherein the peripheral swirler inlet cup comprises a high swirler number (HSN) swirler inlet cup having a high bell mouth and a low swirler number (LSN) swirler inlet cup having a low bell mouth, and the center radius is different from at least one of a high radius of the high bell mouth and a low radius of the low bell mouth.
The combustion system according to embodiment 34, wherein the low radius is larger than the center radius and is the same as the high radius.
The combustion system according to any of embodiments 34-35, wherein a low diameter of the LSN swirler inlet cup is larger than a high diameter of the HSN swirler inlet cup.
The combustion system according to any of embodiments 30-36, further comprising a plurality of nozzles inserted into the peripheral and center swirler inlet cups.
The combustion system according to embodiment 37, wherein a fuel is provided through the plurality of nozzles such that the fuel is mixed with air provided through the peripheral and center swirler inlet cups.
A greater understanding of the present invention and of its many advantages may be had from the following example, given by way of illustration. The following example is illustrative of some of the methods, applications, embodiments, and variants of the present invention. It is, of course, not to be considered as limiting the invention. Numerous changes and modifications can be made with respect to the invention.
A combustor can include: a combustion chamber, a cap covering the combustion chamber, a first swirler inlet cup passing through the cap and having a first length and a first bell mouth, a second swirler inlet cup passing through the cap and having a second length and a second bell mouth, and a third swirler inlet cup passing through the cap and having a third length and a third bell mouth, wherein the first length is different from the third length, and wherein the first bell mouth is different from the third bell mouth. A first radius of the first bell mouth and a second radius of the second bell mouth are 15 mm.
Flow uniformity inside the HSN swirler inlet cup increases from 0.855 to 0.958 and flow uniformity inside the LSN swirler inlet cup increases from 0.857 to 0.954, wherein the flow uniformity is defined as a local flow speed ratio with respect to the average flow speed. Referring to the axial component profile of
It should be understood that the examples and embodiments described herein are for illustrative purposes only and that various modifications or changes in light thereof will be suggested to persons skilled in the art and are to be included within the spirit and purview of this application. Thus, the invention is not intended to limit the examples described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
