BURNER MODULE

Abstract

A burner module according to one aspect of the present invention comprises burner rings having the same center point but different diameters. Each burner ring includes microburners arranged in a ring shape and emitting a fuel-air mixture containing hydrogen and air. Each microburner comprises: an air channel through which air flows; and a hydrogen injection hole that injects hydrogen into the air that has flowed through the air channel or into air that has not yet flowed through the air channel in a direction that intersects the air flow. At least one of the burner rings is an irregular burner ring. The irregular burner ring comprises regular and irregular areas arranged alternately in the circumferential direction.The amount of fuel-air mixture emitted per unit area in the irregular area is less than the amount of fuel-air mixture emitted per unit area in the regular area.

Description

Technical field

[0001] The present disclosure relates to a burner module. State of the art

[0002] PTL 1 below discloses a fuel injector (corresponding to a burner module of the present disclosure) with: fuel injection ports that are open in the radial direction; and air guide grooves that direct air to the fuel injected from the fuel injection ports. According to this fuel injector, even when using highly reactive fuel, such as hydrogen, backfiring can be prevented while suppressing the formation of NOx. Citation list for patent literature

[0003] PTL 1: Japanese published patent application no. 2020-106258 Summary of the invention: Technical problem

[0004] According to the fuel injector described in PTL 1, the fuel injection holes and the air guide grooves are arranged in an annular configuration. With this fuel injector configured as described above, a large flame area can be generated, and combustion oscillations can occur due to the circumferential movement of this large flame area.

[0005] The object of the present invention is to provide a burner module that can prevent backfire while suppressing the formation of NOx and suppressing combustion oscillations when hydrogen is used as fuel. Solution to the problem

[0006] A burner module according to one aspect of the present invention comprises burner rings having the same center point but different diameters. Each burner ring includes microburners arranged in a ring shape and emitting a fuel-air mixture containing hydrogen and air. Each microburner comprises: an air channel through which air flows; and a hydrogen injection orifice that injects hydrogen into the air that has flowed through the air channel or into air that has not yet flowed through the air channel in a direction that intersects the air flow. At least one of the burner rings is an irregular burner ring. The irregular burner ring comprises regular and irregular areas arranged alternately in the circumferential direction.The amount of fuel-air mixture emitted per unit area in the irregular area is less than the amount of fuel-air mixture emitted per unit area in the regular area. Advantageous effects of the invention

[0007] The configuration described above enables a burner module that can prevent backfire while suppressing NOx formation and combustion oscillations when hydrogen is used as fuel. Brief description of the drawings Fig. Figure 1 is a cross-sectional view of a combustion chamber. Fig. Figure 2 is a front view of a burner module. Fig. Figure 3 is an enlarged view of part of the Fig. 2 burner modules shown. Fig. 4 is a sectional view along line IV-IV in Fig. 3. Description of the combustion chamber designs

[0008] The following describes a burner module 100 according to one embodiment. First, a combustion chamber 101 containing the burner module 100 is described. Fig. Figure 1 is a sectional view of combustion chamber 101. The following is a front view of combustion chamber 101, shown on the paper surface of Fig. 1 the left side, simply referred to as the "front", and a back side of combustion chamber 101, which is on the paper surface of Fig. The right side is referred to as the "rear". The combustion chamber 101 of the embodiment is a canister combustion chamber in which the canisters are located around a central axis of the gas turbine engine. However, the type of combustion chamber 101 is not limited, and the combustion chamber 101 can, for example, be an annular combustion chamber.

[0009] As in Fig. As shown in Figure 1, the combustion chamber 101 comprises: a combustion chamber lining 103 defining a combustion chamber 102 therein; the burner module 100, which has a disc shape and expels a fuel-air mixture containing hydrogen and air towards the combustion chamber 102; a support tube 104 supporting the burner module 100; and a housing 105 accommodating the combustion chamber lining 103, the burner module 100 and the support tube 104.

[0010] An annular air intake channel 106 is defined between the combustion chamber lining 103 and the housing 105. Air is supplied to the air intake channel 106 from the rear. The air supplied to the air intake channel 106 flows towards the front of the air intake channel 106. Furthermore, the air flowing in the air intake channel 106 passes through air intake openings 107 of the support tube 104 into the support tube 104, flows through a guide plate 108, and is supplied to the burner module 100. A hydrogen supply line 109 is also connected to the burner module 100, and hydrogen is supplied to the burner module 100 via this hydrogen supply line 109.

[0011] The burner module 100 mixes the air supplied to it with the hydrogen to produce the fuel-air mixture and directs the fuel-air mixture towards the combustion chamber 102. The fuel-air mixture expelled from the burner module 100 is ignited and combusted by an igniter 110 located on the combustion chamber lining 103. The combustion gas produced by the combustion of the fuel-air mixture flows to the rear of the combustion chamber 102. As described above, the combustion chamber 101 of the present embodiment is of the reverse flow type, in which the flow direction of the air flowing in the air inlet channel 106 and the flow direction of the combustion gas flowing in the combustion chamber 102 are opposite to each other. However, the combustion chamber 101 can also be of the axial flow type, in which the flow direction of the air and the flow direction of the combustion gas are the same. burner module

[0012] Next, the burner module 100 will be described in more detail according to the embodiment. Fig. Figure 2 is a front view of the burner module 100, i.e., a representation of the burner module 100 as seen from the combustion chamber 102. As described above, the burner module 100 has a disk shape. In the following, a circumferential direction of the burner module 100 is simply referred to as the "circumferential direction" and a radial direction of the burner module 100 simply as the "radial direction".

[0013] As in Fig. As shown in Figure 2, the burner module 100 according to the embodiment comprises: four air guide plates 17, each having an annular shape; and three hydrogen supply rings 18, which are arranged between the four air guide plates 17 and each have an annular shape. Fig. 2. The parts represented by diagonal lines are the hydrogen supply rings 18. The air guide plates 17 and the hydrogen supply rings 18 have the same center point but different diameters. The air supplied to the burner module 100 is directed to the rear surfaces (surfaces on the front) of the air guide plates 17. In addition, the hydrogen supply line 109 (see Fig. 1) Hydrogen supplied to the burner module 100 is supplied to the hydrogen supply rings 18.

[0014] Furthermore, the burner module 100 comprises six burner rings 11 to 16. These burner rings 11 to 16 have the same center point but different diameters. Hereinafter, the burner rings 11 to 16 are designated as first burner ring 11, second burner ring 12, third burner ring 13, fourth burner ring 14, fifth burner ring 15, and sixth burner ring 16 in descending order of diameter.

[0015] The burner module 100 according to the embodiment comprises four air guide plates 17, three hydrogen supply rings 18 and six burner rings 11 to 16. However, the number of air guide plates 17, the number of hydrogen supply rings 18 and the number of burner rings 11 to 16 in the burner module 100 are not limited. burner ring

[0016] Next, the burner rings 11 to 16 mentioned above will be described in more detail. Each of the burner rings 11 to 16 comprises microburners 20 arranged in a ring. In other words, each of the burner rings 11 to 16 is formed by the ring-shaped arrangement of microburners 20. Each of the microburners 20 can mix the hydrogen and air to produce the hydrogen-air mixture and can expel the hydrogen-air mixture towards the combustion chamber 102.

[0017] Fig. Figure 3 is an enlarged view of part of the Fig. 2 of the burner module 100 shown. The top side on the paper surface of Fig. 3 is an outer side in the radial direction, and the underside on the paper surface of Fig. 3 is an inside in the radial direction. Fig. Figure 3 is an enlarged view of part of the first burner ring 11 and part of the second burner ring 12. Furthermore, Fig. 4 a sectional view along line IV-IV of Fig. 3. The top side of the paper surface of Fig. 4 is the outside in the radial direction, the underside on the paper surface of Fig. 4 is the inside in the radial direction, the left side on the paper surface of Fig. 4 is the front and the right side on the paper surface of Fig. 4 is the reverse.

[0018] As in Fig. As shown in Figure 3, each of the micro burners 20 includes an air channel 21 and a hydrogen injection hole 22.

[0019] The air channels 21 are channels through which air flows. In this embodiment, the air guide plate 17 includes air holes 23, and the air holes 23 define the air channels 21. The shape of the air holes 23 is not restricted. For example, the air guide plates 17 and the hydrogen supply ring 18 can be arranged with a gap in the radial direction, and the gap can be connected to the air holes 23. As shown in Fig. As shown in Figure 4, the air supplied to the rear sides of the air guide plates 17 flows through the air channels 21 towards the rear in a direction (axial direction of the combustion chamber 101) that is perpendicular to the radial direction, i.e. in the direction of the combustion chamber 102.

[0020] The hydrogen injection holes 22 are holes through which the hydrogen is injected. As in Fig. As shown in Figure 3, the hydrogen injection holes 22 are located on the hydrogen supply ring 18 and at the same circumferential positions as the centers of the corresponding air channels 21. As shown in Fig. As shown in Figure 4, a hydrogen supply channel 24 is defined in the hydrogen supply ring 18, and the hydrogen supply line 109 is connected via the hydrogen supply line (see Figure 4). Fig. 1) The supplied hydrogen flows through the hydrogen supply channel 24 to the circumferential positions. The hydrogen injection holes 22 extend radially from the hydrogen supply channel 24 and inject the hydrogen radially from the hydrogen supply channel 24.

[0021] Furthermore, in this embodiment, the hydrogen injection port 22 is located downstream of the air duct 21. More precisely, the hydrogen injection port 22 is located downstream of the air duct 21 in the direction of airflow. Therefore, the hydrogen injection port 22 injects the hydrogen into the air that has flowed through the air duct 21 in a direction that intersects the airflow. However, the hydrogen injection port 22 can also inject the hydrogen into air that has not yet flowed through the air duct 21 in a direction that intersects the airflow. In this embodiment, the hydrogen injection port 22 injects the hydrogen in a direction orthogonal to the airflow. However, the hydrogen injection port 22 does not necessarily have to inject the hydrogen in a direction perpendicular to the airflow.For example, the hydrogen injection hole 22 can inject the hydrogen in a direction between an upward inclination of 10° relative to the direction perpendicular to the airflow direction and a downward inclination of 20° relative to the direction perpendicular to the airflow direction.

[0022] The foregoing has described the microburner 20 primarily with reference to the microburner 20 of the first burner ring 11. Each of the microburners 20 of burner rings 12 to 16 is essentially identical in its configuration to the microburner 20 of the first burner ring 11. However, the hydrogen injection holes 22 of the microburners 20 of the first burner ring 11, the third burner ring 13, and the fifth burner ring 15 inject the hydrogen radially outwards, while the hydrogen injection holes 22 of the microburners 20 of the second burner ring 12, the fourth burner ring 14, and the sixth burner ring 16 inject the hydrogen radially inwards.

[0023] As described above, the fuel-air mixture containing hydrogen and air can be dispersed because the burner module 100, according to the embodiment, comprises a large number of microburners 20. Furthermore, since the hydrogen is injected in a direction that intersects the airflow, the mixing of hydrogen and air is promoted. Therefore, according to the burner module 100 of the embodiment, local high-temperature combustion can be suppressed, thereby suppressing NOx formation. Additionally, since the hydrogen injection port 22 injects the hydrogen into the air that has flowed through the air duct 21, backfiring can be suppressed.

[0024] In this embodiment, the burner rings 11 to 16, which expel the fuel-air mixture, can be selected according to the operating condition of the gas turbine engine, including the combustion chamber 101, i.e., according to the quantity of fuel-air mixture expelled from the entire burner module 100. For example, at the start of operation of the gas turbine engine, the fuel-air mixture can be expelled from the first burner ring 11 and the second burner ring 12, while the fuel-air mixture is not expelled from the other burner rings 11 to 14. On the other hand, under high load of the gas turbine engine, the fuel-air mixture can be expelled from all burner rings 11 to 16. Irregular burner ring

[0025] Next, an irregular burner ring is described. If the microburners 20 are arranged in a ring shape as in the embodiment, combustion oscillations can occur due to the circumferential movement of a large flame segment. In the embodiment, at least one of the burner rings 11 to 16 is an irregular burner ring in order to suppress the combustion oscillations.

[0026] Here, the term "irregular burner ring" refers to a burner ring in which regular areas 31 and irregular areas 32 are arranged alternately in the circumferential direction. As in Fig. As shown in Figure 2, in this embodiment the first burner ring 11, the second burner ring 12, the third burner ring 13, and the fourth burner ring 14 comprise the irregular areas 32 and therefore correspond to the irregular burner rings. Furthermore, the irregular area 32 denotes an area in which the amount of fuel-air mixture emitted per unit area (hereinafter referred to as the "ejection density") is lower than that of the regular area 31.

[0027] In this embodiment, the microburners 20 are located at regular intervals in the circumferential direction within the regular area 31, but not within the irregular area 32. More precisely, an area in which a microburner 20 is located is the regular area 31, and an area in which a microburner 20 is not located is the irregular area 32. Therefore, the emission density in the irregular area 32 can be lower than the emission density in the regular area 31. However, the microburners 20 can be arranged in both the irregular area 32 and the regular area 31, and the amount of fuel-air mixture emitted from the microburners 20 in the irregular area 32 can be lower than the amount of fuel-air mixture emitted from the microburners 20 in the regular area 31.Even in this case, the emission density in the irregular range 32 can be lower than the emission density in the regular range 31.

[0028] As described above, the irregular burner ring encompasses the irregular area 32, which has a low emission density. Therefore, even if a large flame section is generated in the burner module 100, this large flame section cannot cross the irregular area 32 or move circumferentially. This suppresses the combustion oscillations of the burner module 100. As described above, in this embodiment, at least one of the burner rings 11 to 16 contained in the burner module 100 is the irregular burner ring. However, all burner rings 11 to 16 can also be irregular burner rings. Furthermore, only one of the burner rings 11 to 16 contained in the burner module 100 can be the irregular burner ring.

[0029] As in Fig. As shown in Figure 3, an irregular distance X is longer than a regular distance Y. The irregular distance X is the center-to-center distance between adjacent microburners 20 that enclose the irregular area 32. The regular distance Y is the center-to-center distance between the microburners 20 that are adjacent to each other in the regular area 31. For example, the irregular distance X in each irregular burner ring can be at least twice as long and at most ten times as long as the regular distance Y. If the irregular distance X is set to at least twice the regular distance Y, movement of the large flame section can be effectively prevented. Furthermore, if the irregular distance X in each irregular burner ring is set to at most ten times the regular distance Y, the required amount of expelled fuel-air mixture can be ensured.

[0030] As in Fig. As shown in Figure 2, the first burner ring 11 encompasses the irregular areas 32, and some of the circumferential positions of the irregular areas 32 of the first burner ring 11 overlap the circumferential positions of the irregular areas 32 of the third burner ring 13. Similarly, the second burner ring 12 encompasses the irregular areas 32, and some of the circumferential positions of the irregular areas 32 of the second burner ring 12 overlap the circumferential positions of the irregular areas 32 of the fourth burner ring 14. As described above, the movement of the large flame section can be effectively prevented if the circumferential positions of the irregular areas 32 of the large-diameter burner rings 11 and 12 overlap with the circumferential positions of the irregular areas 32 of the small-diameter burner rings 13 and 14.

[0031] In this embodiment, some of the irregular areas 32 of the first burner ring 11 and all of the irregular areas 32 of the third burner ring 13 overlap circumferentially. However, some of the irregular areas 32 of the first burner ring 11 and some of the irregular areas 32 of the third burner ring 13 may overlap circumferentially, or all of the irregular areas 32 of the first burner ring 11 and all of the irregular areas 32 of the third burner ring 13 may overlap circumferentially. The same applies to the second burner ring 12 and the fourth burner ring 14. Furthermore, the irregular areas 32 of all burner rings 11 to 14, which are the irregular burner rings, may overlap circumferentially, i.e., they may be located at the same circumferential positions.

[0032] Furthermore, the ratio of the irregular areas 32 to the total circumferential area in each of the burner rings 11 to 14, which are the irregular burner rings, can be 10% or more and 50% or less. In the embodiment, the ratio of the irregular areas 32 to the total circumferential area in each of the first burner rings 11 and the second burner rings 12 is 50%, and the ratio of the irregular areas 32 to the total circumferential area in each of the third burner rings 13 and the fourth burner rings 14 is 10%.

[0033] If the ratio of the irregular areas 32 to the total circumferential area in the irregular burner ring is set to 10% or more, the movement of the large flame section can be effectively prevented. Furthermore, if the ratio of the irregular areas 32 to the total circumferential area in the irregular burner ring is set to 50%, the required amount of expelled fuel-air mixture can be ensured.

[0034] As described above, the ratio of the irregular areas 32 to the total circumferential area in each of the first burner rings 11 and second burner rings 12, which are the large-diameter burner rings, is 50%, and thus higher than 10%, which corresponds to the ratio of the irregular areas 32 to the total circumferential area in each of the third burner rings 13 and fourth burner rings 14, which are the small-diameter burner rings. According to this configuration, the ratio of the irregular areas 32 to the total circumferential area in the burner ring can be finely adjusted, since the outer circumference of the large-diameter burner ring is long. conclusion

[0035] A first aspect disclosed in the present description is a burner module with burner rings having the same center point but different diameters, each burner ring comprising microburners arranged in a ring and emitting a fuel-air mixture containing hydrogen and air; each microburner comprising an air channel through which air flows and a hydrogen injection hole that injects hydrogen into the air that has flowed through the air channel or into air that has not yet flowed through the air channel in a direction that intersects the direction of air flow; at least one of the burner rings is an irregular burner ring; the irregular burner ring comprises regular and irregular areas arranged alternately in the circumferential direction;and the amount of fuel-air mixture emitted per unit area in the irregular area is less than the amount of fuel-air mixture emitted per unit area in the regular area.

[0036] In this configuration, hydrogen is injected into the air that has flowed through the air duct in a direction that intersects the airflow. Therefore, backdraft can be prevented while suppressing NOx formation. Furthermore, since at least one of the burner rings is the irregular burner ring, circumferential movement of the large flame section can be prevented, thus suppressing combustion oscillations.

[0037] A second aspect disclosed in the present description is the burner module according to the first aspect, wherein: the microburners are arranged in the regular areas; and the microburners are not arranged in the irregular areas.

[0038] According to this configuration, the irregular area can be easily formed.

[0039] A third aspect disclosed in the present description is the burner module according to the second aspect, wherein an irregular distance, which is a center-to-center distance between the adjacent microburners enclosing the irregular area, is longer than a regular distance, which is a center-to-center distance between the microburners adjacent to each other in the regular area.

[0040] According to this configuration, the circumferential movement of the large flame section can be effectively prevented, thereby effectively suppressing combustion oscillations.

[0041] A fourth aspect disclosed in the present description is the burner module according to the third aspect, wherein the irregular distance is at least twice as long and at most ten times as long as the regular distance.

[0042] According to this configuration, the required amount of expelled fuel-air mixture can be ensured, while preventing the movement of the large flame section.

[0043] A fifth aspect disclosed in the present description is the burner module according to one of the first to fourth aspects, wherein the ratio of the irregular areas to a total circumferential area in the irregular burner ring is 10% or more and 50% or less.

[0044] According to this configuration, the required amount of expelled fuel-air mixture can be ensured, while preventing the movement of the large flame section.

[0045] A sixth aspect disclosed in the present description is the burner module according to any one of the first to fifth aspects, wherein the burner rings comprise a large-diameter burner ring, which is an irregular burner ring, and a small-diameter burner ring, which is the irregular burner ring and has a smaller diameter than the large-diameter burner ring; and a circumferential position of at least one of the irregular areas of the large-diameter burner ring overlaps a circumferential position of at least one of the irregular areas of the small-diameter burner ring.

[0046] According to this configuration, the movement of the large flame section can be effectively prevented.

[0047] A seventh aspect disclosed in the present description is the burner module according to any one of the first to sixth aspects, wherein: the burner rings comprise a large-diameter burner ring, which is an irregular burner ring, and a small-diameter burner ring, which is the irregular burner ring and has a smaller diameter than the large-diameter burner ring; and the ratio of the irregular areas to a total circumferential area in the large-diameter burner ring is higher than the ratio of the irregular areas to a total circumferential area in the small-diameter burner ring.

[0048] According to this configuration, the ratio of the irregular areas to the entire circumferential area in the burner ring can be finely adjusted. REFERENCE MARK LIST 11 first burner ring 12 second burner ring 13 third burner ring 14 fourth burner ring 15 fifth burner ring 16 sixth burner ring 20 micro burners 21 Air duct 22 Hydrogen injection hole 31 regular range 32 irregular area 100 burner modules QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 2020-106258

[0003]

Claims

[1] Burner module with burner rings that have the same center point but different diameters, wherein Each of the burner rings comprises microburners that are arranged in a ring shape and emit a fuel-air mixture containing hydrogen and air; each of the microburners includes an air duct through which the air flows, and a hydrogen injection hole that injects the hydrogen into the air that has flowed through the air duct, or into the air that has not yet flowed through the air duct, in a direction that intersects the flow direction of the air; at least one of the burner rings is an irregular burner ring; The irregular burner ring comprises regular and irregular areas arranged alternately in the circumferential direction; and The amount of fuel-air mixture delivered per unit area in the irregular area is smaller than the amount of fuel-air mixture delivered per unit area in the regular area. [2] The burner module according to claim 1, wherein: the micro-burners are arranged in regular intervals; and the microburners are not arranged in the irregular areas. [3] The burner module according to claim 2, wherein an irregular distance, which is a center-to-center distance between the adjacent microburners enclosing the irregular area, is longer than a regular distance, which is a center-to-center distance between the microburners that are adjacent to each other in the regular area. [4] The burner module according to claim 3, wherein the irregular distance is at least twice as long and at most ten times as long as the regular distance. [5] The burner module according to claim 1, wherein the ratio of the irregular areas to the total circumferential area in the irregular burner ring is 10% or more and 50% or less. [6] The burner module according to claim 1, wherein the burner rings comprise a large-diameter burner ring, which is an irregular burner ring, and a small-diameter burner ring, which is the irregular burner ring and has a smaller diameter than the large-diameter burner ring; and A circumferential position overlaps at least one of the irregular areas of the burner ring with a large diameter and at least one of the irregular areas of the burner ring with a small diameter. [7] The burner module according to claim 1, wherein: the burner rings include a large-diameter burner ring, which is an irregular burner ring, and a small-diameter burner ring, which is the irregular burner ring and has a smaller diameter than the large-diameter burner ring; and The ratio of irregular areas to the total circumference in the large-diameter burner ring is greater than the ratio of irregular areas to the total circumference in the small-diameter burner ring.

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