Micro-mixing nozzle with adjustable jet velocity, combustor and gas turbine

Abstract

The application discloses a micro-mixing nozzle with adjustable jet velocity, a combustor and a gas turbine, and relates to the technical field of micro-mixing nozzles.The micro-mixing nozzle comprises a nozzle body comprising a plurality of micro-mixing pipes, and an adjusting assembly comprising a plurality of adjusting units, each adjusting unit comprising an adjusting body, a connecting structure and a sleeve, each sleeve being sleeved on the outside of one micro-mixing pipe, the adjusting body being arranged at the outlet of the micro-mixing pipe, the adjusting body being connected to the inside of the sleeve through the connecting structure, and a sliding groove being arranged on the micro-mixing pipe to avoid the connecting structure; wherein the cross-sectional size of each adjusting body is arranged to be different along the length direction of the micro-mixing pipe, and the position of the adjusting body can be adjusted by moving the sleeve along the micro-mixing pipe, so as to change the outlet cross-sectional area of the micro-mixing pipe through the adjusting body. The technical scheme provided by the application can adjust the jet velocity of the micro-mixing nozzle, so as to adapt to the combustion requirements of different fuels and ensure the stability and safety of combustion.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gas turbine technology, and particularly relates to a micro-mixing nozzle with adjustable jet velocity, a combustor and a gas turbine. BACKGROUND

[0002] Gas turbines are widely used in aviation, energy and industry fields. With the increasing requirements of environmental protection and economy, the design of gas turbine combustion chambers faces new challenges. In the traditional combustion chamber design, the mixing of fuel and air is not uniform enough, resulting in high flame temperature, unstable combustion, high NOx emission and poor fuel adaptability. Micro-mixing combustion technology can effectively improve the combustion performance and reduce the emission of harmful substances by realizing efficient mixing of fuel and air before combustion.

[0003] In the micro-mixing combustion chamber, the micro-mixing nozzle is a key component, which directly affects the mixing effect of fuel and air and the combustion performance. However, different fuels have different physical and chemical properties, which puts different requirements on the design of micro-mixing nozzle. For example, hydrogen has high reactivity and faster flame propagation speed. If the outlet velocity of the micro-mixing channel is too low, backfire may occur. On the contrary, the reactivity of methane is low, and the flame propagation speed is slow. If the outlet flow velocity of the micro-mixing channel is too high, the flame may be extinguished.

[0004] The existing micro-mixing nozzle usually adopts a fixed geometric structure, which is difficult to flexibly adjust the outlet velocity according to the needs of different fuels, and cannot adapt to the combustion conditions of multiple fuels, resulting in poor combustion chamber operation stability and even safety hazards. SUMMARY

[0005] The embodiments of the present application provide a micro-mixing nozzle with adjustable jet velocity, a combustor and a gas turbine, to solve the problem that the existing micro-mixing nozzle cannot adjust the outlet velocity according to the needs of different fuels, and cannot adapt to the combustion adjustment of multiple fuels.

[0006] The embodiments of the present application provide a micro-mixing nozzle with adjustable jet velocity, comprising:

[0007] A nozzle body comprising a plurality of micro-mixing pipes, each of the micro-mixing pipes having a micro-mixing channel for jetting fuel gas inside;

[0008] An adjusting assembly comprising a plurality of adjusting units, each of the adjusting units comprising an adjusting body, a connecting structure and a sleeve, each of the sleeves being sleeved on the outside of one of the micro-mixing pipes, the adjusting body being arranged at the outlet of the micro-mixing pipe, the adjusting body being connected to the inside of the sleeve through the connecting structure, and the micro-mixing pipe being provided with a sliding groove avoiding the connecting structure;

[0009] The cross-sectional size of each of the adjustment bodies is different along the length direction of the micro-mixing pipe, and the movement of the sleeve along the micro-mixing pipe can adjust the position of the adjustment bodies to change the outlet cross-sectional area of the micro-mixing pipe through the adjustment bodies.

[0010] In one embodiment, the micro-mixing pipe is provided with the sliding groove on each of the opposite sides, and the connecting structure comprises a first connecting body, a second connecting body and a third connecting body, the first connecting body and the second connecting body are connected to the inner wall of the sleeve through the sliding grooves on the two sides, and the third connecting body is connected to the adjustment bodies.

[0011] In one embodiment, the adjustment assembly further comprises a sleeve connecting member configured to fix a plurality of the sleeves together so that the plurality of the adjustment units move together.

[0012] In one embodiment, at least part of the sleeves is provided with a fastener configured to fasten the sleeve to the micro-mixing pipe after the sleeve moves to a predetermined position.

[0013] In one embodiment, the nozzle body further comprises a first end cover provided with a plurality of mounting holes corresponding to the micro-mixing pipes respectively, and one end of the plurality of the micro-mixing pipes with outlets is inserted into the mounting holes to be mounted on the first end cover.

[0014] The sliding groove is configured to extend to the end of the micro-mixing pipe with the outlet, and the first end cover is configured to limit the range of sliding of the sleeve towards the outlet.

[0015] In one embodiment, the inner wall of the mounting hole is provided with a limiting protrusion matched with the sliding groove.

[0016] In one embodiment, the nozzle body further comprises a second end cover and an outer peripheral shell, the second end cover is mounted on the end of the micro-mixing pipe away from the first end cover, the outer peripheral shell is configured to surround the plurality of the micro-mixing pipes, and the two ends of the outer peripheral shell are connected to the first end cover and the second end cover respectively.

[0017] In one embodiment, each of the adjustment bodies comprises a first tapered body, and the adjustment bodies change the outlet cross-sectional area of the micro-mixing pipe through the first tapered body when in the adjustment position.

[0018] In one embodiment, each of the adjustment bodies further comprises a second tapered body, the second tapered body is fixed to the first tapered body, and the large ends of the first tapered body and the second tapered body are connected to each other, wherein the second tapered body is farther away from the micro-mixing pipe than the first tapered body.

[0019] The embodiment of the present application also provides a combustor comprising at least one micro-mixing nozzle as described above.

[0020] The embodiment of the present application also provides a gas turbine comprising the combustor as described above.

[0021] The technical scheme provided by the present application can adjust the jet speed of the micro-mixing nozzle according to the characteristics of different fuels, so as to adapt to the combustion requirements of different fuels, thereby ensuring the stability and safety of combustion.

[0022] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent from the description, or can be learned by practice of the present application. Other advantages of the present application can be realized and obtained by means of the schemes described in the specification and the attached drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings are included to provide an understanding of the present application, and constitute a part of the specification, together with the embodiments of the present application, to explain the technical scheme of the present application, and do not constitute a limitation on the technical scheme of the present application.

[0024] Figure 1 The structure schematic diagram of the micro-mixing nozzle according to one embodiment of the present application is shown in FIG. 1.

[0025] Figure 2 The structure schematic diagram of the micro-mixing nozzle according to one embodiment of the present application is shown in FIG. 1. Figure 1

[0026] Figure 3 The structure schematic diagram of the micro-mixing nozzle according to one embodiment of the present application is shown in FIG. 1.

[0027] Figure 4 The structure schematic diagram of the micro-mixing nozzle according to one embodiment of the present application is shown in FIG. 1.

[0028] Figure 5 The structure schematic diagram of the micro-mixing nozzle according to one embodiment of the present application is shown in FIG. 1.

[0029] Figure 6 The structure schematic diagram of the micro-mixing nozzle according to one embodiment of the present application is shown in FIG. 1. Figure 5

[0030] The structure schematic diagram of the micro-mixing nozzle according to one embodiment of the present application is shown in FIG. 1. Figure 7

[0031] The structure schematic diagram of the micro-mixing nozzle according to one embodiment of the present application is shown in FIG. 1. Figure 8 The structure schematic diagram of the micro-mixing nozzle according to one embodiment of the present application is shown in FIG. 1.

[0032] The structure schematic diagram of the micro-mixing nozzle according to one embodiment of the present application is shown in FIG. 1.

[0033] ​1 - nozzle body; 11 - micro mixing pipe; 111 - chute; 12 - first end cover; 121 - mounting hole; 122 - limiting protrusion; 13 - second end cover; 14 - outer peripheral housing; 2 - adjusting assembly; 21 - adjusting body; 211 - first tapered body; 212 - second tapered body; 22 - sleeve; 23 - connecting structure; 231 - first connecting body; 232 - second connecting body; 233 - third connecting body; 24 - fastener; 25 - sleeve connector. DETAILED DESCRIPTION

[0034] The present application describes a number of embodiments, but the description is exemplary rather than limiting and it will be apparent to those of ordinary skill in the art that numerous more embodiments and implementations are possible within the scope of the embodiments described in the present application. Although a number of possible combinations of features have been set forth herein, and discussed in the specific implementation, many other combinations of the disclosed features are possible. Unless specifically intended otherwise, any feature or element in any embodiment can be utilized in any other embodiment, whether or not that particular combination is specifically set forth herein. Furthermore, many of the features and elements described herein can be combined with each other and / or removed, unless specifically intended otherwise.

[0035] The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements disclosed herein can also be combined with any conventional features or elements to form unique invention solutions. Any feature or element of any embodiment can also be combined with features or elements from other invention solutions to form another unique invention solution. Therefore, it is to be understood that any feature shown and / or discussed in the present application can be realized singly or in any appropriate combination. Accordingly, the embodiments are not to be restricted, except as by the appended claims and their equivalents. Furthermore, various modifications and changes can be made within the scope of the appended claims.

[0036] Furthermore, in describing representative embodiments, the specification can have presented the method and / or process as a particular sequence of steps. However, to the extent that the method or process depends on more than one step, the method or process should not be limited to the specific order of steps described. Other sequences of steps can be possible, and are within the scope of the embodiments. Therefore, the specific order of steps set forth in the specification should not be construed as limitations on the claims. Further, the claims should not be limited to the steps of the method and / or process in the order presented in the specification. Those of ordinary skill in the art will readily recognize that the order of steps can be varied, and still remain within the scope of the embodiments.

[0037] The embodiments of the present application provide a micro mixing nozzle with adjustable air jet speed, such asFigures 1-2 As shown, the micro-mixing nozzle comprises a nozzle body 1 and an adjusting assembly 2.

[0038] The nozzle body 1 comprises a plurality of micro-mixing pipes 11, each of which has a micro-mixing channel for injecting fuel gas.

[0039] The adjusting assembly 2 comprises a plurality of adjusting units, each of which comprises an adjusting body 21, a sleeve 22 and a connecting structure 23, each sleeve 22 is sleeved on the outside of a micro-mixing pipe 11, the adjusting body 1 is arranged at the outlet of the micro-mixing pipe 11, the adjusting body 21 is connected to the inside of the sleeve 22 through the connecting structure 23, and the micro-mixing pipe 11 is provided with a sliding groove 111 which avoids the connecting structure 23.

[0040] Each adjusting body 21 has different cross-sectional sizes along the length direction of the micro-mixing pipe 11, and the sleeve 22 can move along the micro-mixing pipe 11 to adjust the position of the adjusting body 21, so as to change the outlet cross-sectional area of the micro-mixing pipe 11 through the adjusting body 21. The gas injection speed of the micro-mixing nozzle is changed by changing the outlet cross-sectional area of the micro-mixing pipe 11.

[0041] The technical scheme provided by the present application can adjust the gas injection speed of the micro-mixing nozzle according to the characteristics of different fuels to adapt to the combustion requirements of different fuels, thereby ensuring the stability and safety of combustion.

[0042] In one embodiment, as shown in Figures 5-7 Each adjusting body 21 comprises a first tapered body 211, and the adjusting body 21 changes the outlet cross-sectional area of the micro-mixing pipe 11 through the first tapered body 211 when in the adjusting position.

[0043] In this embodiment, each adjusting body 21 further comprises a second tapered body 212, the second tapered body 212 is fixed to the first tapered body 211, and the second tapered body 212 is farther away from the micro-mixing pipe 11 than the first tapered body 211, wherein the large ends of the first tapered body 211 and the second tapered body 212 are connected to each other, so that the combustion gas flows along the second tapered body 212 after being injected from the outlet of the micro-mixing pipe 11, which can reduce airflow disturbance and flow loss and improve combustion stability.

[0044] In one embodiment, as shown in Figures 3-4 The opposite sides of the micro-mixing pipe 11 are respectively provided with sliding grooves 111, as shown in Figures 5-7As shown, the connecting structure 23 for connecting the adjusting body 21 to the sleeve 22 comprises a first connecting body 231, a second connecting body 232 and a third connecting body 233, which form a T-shaped structure. The first connecting body 231 and the second connecting body 232 are connected to the inner wall of the sleeve 22 through the two side grooves 111 respectively, and the third connecting body 233 is connected to the adjusting body 21. The connecting structure 23 is located outside the combustion zone, and the temperature is low during the combustion process, thereby prolonging the service life of the device.

[0045] In this embodiment, the connecting structure 23 is connected to the sleeve 22 through the two connecting bodies passing through the groove 111, which is beneficial to the stability of the connection. The first connecting body 231 and the second connecting body 232 can be respectively arranged to slide with the groove 111 to play a guiding role. In this way, the movement of each adjusting unit relative to the micro-mixing pipe 11 is more stable. It can be understood that one groove or more grooves can also be arranged on the micro-mixing pipe 11, which is not limited herein. Correspondingly, the connecting structure 23 needs to be changed in structure to arrange the connecting bodies corresponding to the groove 111.

[0046] In one embodiment, the adjusting assembly 2 further comprises a sleeve connecting piece 25, which is arranged to fix the plurality of sleeves 22 together so that the plurality of sleeves 22 move together, so that the plurality of adjusting units can realize synchronous adjustment of the outlet of the micro-mixing channel. Figure 5 In an embodiment, the sleeve connecting piece 25 is a disc structure, and the disc structure is provided with a fixing hole corresponding to each sleeve 22. The sleeve 22 is inserted into the fixing hole to be fixed, so that the plurality of adjusting units are fixedly connected as a whole structure.

[0047] It can be understood that the scheme of the present application does not limit the way of synchronous adjustment of the plurality of adjusting units, and each adjusting unit can also be arranged to be adjusted individually.

[0048] After each adjusting unit realizes the adjustment of the outlet of the micro-mixing channel, the adjusting unit can be fixed to avoid the change of the position of the adjusting body 21 due to vibration or operation error during the operation of the nozzle, thereby affecting the outlet jet speed, so as to ensure the operation stability and reliability of the device.

[0049] In one embodiment, the sleeve 22 is provided with a fastener 24, which is arranged to fasten the sleeve 22 to the micro-mixing pipe 11 after the sleeve 22 is moved to a predetermined position. The fastener 24 can be a bolt penetrating the wall of the sleeve 22, and the sleeve 22 is fastened to the micro-mixing pipe 11 by rotating the bolt. When multiple adjustment units are adjusted together, the fastener 24 can be arranged on only some of the sleeves 22. When each adjustment unit is adjusted separately, the fastener 24 needs to be arranged on each sleeve 22. Of course, other structures can be used to limit the position of the sleeve 22, for example, the sleeve 22 can be fixed to the nozzle body 1 by a connecting member 25.

[0050] In one embodiment, as shown in Figure 1 and Figure 2 , the nozzle body 1 further comprises a first end cover 12, which is provided with a plurality of mounting holes 121 corresponding to the micro-mixing pipes 11 respectively. The ends of the micro-mixing pipes 11 having outlets are inserted into the mounting holes 121 respectively to be mounted to the first end cover 12.

[0051] As shown in Figure 3 and Figure 4 , the sliding groove 111 is arranged to extend to the end of the micro-mixing pipe 11 having an outlet. After the first end cover 12 is mounted to the micro-mixing pipe 11, the range of sliding of the sleeve 22 towards the outlet can be limited.

[0052] Figure 8 An embodiment of the first end cover 12 is shown, in which the inner wall of the mounting hole 121 is provided with a limiting protrusion 122, which is arranged to cooperate with the sliding groove 111 on the micro-mixing pipe 11 to limit the rotation of the micro-mixing pipe 11.

[0053] The nozzle body 1 can further comprise a second end cover 13 and a peripheral shell 14. The second end cover 13 is mounted to the end of the micro-mixing pipe 11 away from the first end cover 12. The peripheral shell 14 is arranged to surround the plurality of micro-mixing pipes 11, and the two ends of the peripheral shell 14 are connected to the first end cover 12 and the second end cover 13 respectively. In this way, the first end cover 12, the second end cover 13 and the peripheral shell 14 form the shell of the nozzle, and the components such as the micro-mixing pipes 11 and the sleeves 22 are accommodated in the shell.

[0054] The embodiment of the present application further provides a combustor comprising at least one micro-mixing nozzle as described above.

[0055] The embodiment of the present application further provides a gas turbine comprising a combustor as described above.

[0056] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0057] In addition, the terms "first", "second", and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include at least one of the features.

[0058] In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0059] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, "connecting" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0060] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0061] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0062] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and the person skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A micro-mixing nozzle with adjustable jet velocity, characterized in that, include: The nozzle body includes multiple micro-mixing tubes, each of which has a micro-mixing channel for injecting combustion gas; An adjustment assembly includes multiple adjustment units. Each adjustment unit includes an adjustment body, a connecting structure, and a sleeve. Each sleeve is fitted over the outside of a micro-mixing pipe. The adjustment body is located at the outlet of the micro-mixing pipe. The adjustment body is connected to the inside of the sleeve through the connecting structure. The micro-mixing pipe is provided with a groove to avoid the connecting structure. The cross-sectional size of each of the adjustment bodies is set to be different along the length of the micro-mixing tube. The sleeve can be moved along the micro-mixing tube to adjust the position of the adjustment body, so as to change the outlet cross-sectional area of ​​the micro-mixing tube through the adjustment body. The adjustment assembly further includes a sleeve connector configured to fix multiple sleeves together so that multiple adjustment units can move together.

2. The micro-mixing nozzle according to claim 1, characterized in that, The micro-mixing pipe is provided with the sliding grooves on opposite sides. The connection structure includes a first connector, a second connector and a third connector. The first connector and the second connector pass through the sliding grooves on both sides and are connected to the inner wall of the sleeve. The third connector is connected to the adjustment body.

3. The micro-mixing nozzle according to claim 1, characterized in that, At least a portion of the sleeve is provided with fasteners, which are configured to secure the sleeve to the micro-mixing pipe after the sleeve has been moved to a predetermined position.

4. The micro-mixing nozzle according to claim 1, characterized in that, The nozzle body also includes a first end cap, which is provided with a plurality of mounting holes corresponding to the micro-mixing tubes respectively. The outlet end of each of the plurality of micro-mixing tubes is inserted into the mounting hole and mounted on the first end cap. The chute is configured to extend to the end of the micro-mixing pipe having the outlet, and the first end cap is configured to limit the range of sliding of the sleeve toward the outlet.

5. The micro-mixing nozzle according to claim 4, characterized in that, The inner wall of the mounting hole is provided with a limiting protrusion that cooperates with the slide groove for installation.

6. The micro-mixing nozzle according to claim 4, characterized in that, The nozzle body further includes a second end cap and an outer peripheral housing. The second end cap is installed at the end of the micro-mixing tube away from the first end cap. The outer peripheral housing is configured to surround the plurality of micro-mixing tubes, and the two ends of the outer peripheral housing are respectively connected to the first end cap and the second end cap.

7. The micro-mixing nozzle according to any one of claims 1-6, characterized in that, Each of the adjustment bodies includes a first cone, which changes the outlet cross-sectional area of ​​the micro-mixing pipe when the adjustment body is in the adjusted position.

8. The micro-mixing nozzle according to claim 7, characterized in that, Each of the adjustment bodies further includes a second cone, which is fixed to the first cone, and the large ends of the first cone and the second cone are connected to each other, wherein the second cone is farther away from the micro-mixing pipe than the first cone.

9. A burner, characterized in that, It includes at least one micro-mixing nozzle according to any one of claims 1-8.

10. A gas turbine, characterized in that, Includes the burner according to claim 9.

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