An integrated lean-premixed low-emission combustor

Abstract

The present invention relates to the technical field of engines, and provides an integrated lean-premixed low-pollution combustor, which includes: multiple groups of main module total assemblies, multiple sub-module total assemblies, and a head profile. Each group of main module total assemblies is circumferentially arranged on the head profile respectively. A sub-module total assembly is provided in the central region of each group of main module total assemblies. Each group of main module total assemblies includes multiple main module premixing pipes, multiple main module direct injection pipes, and multiple main module oil paths. Adjacent main module premixing pipes are connected through corresponding main module oil paths and form multiple annular structures on the head profile. Each sub-module total assembly is in the central region of the corresponding annular structure. Multiple main module direct injection pipes are respectively arranged on the corresponding main module oil paths, and each main module direct injection pipe is communicated with a main module oil path. Thus, a flame tube head with a high degree of integration is formed, enabling this structure to reduce the weight of the combustor, simplify the assembly, reduce the weight, and lower the cost.

Description

Technical Field

[0001] The present invention belongs to the technical field of engines, and particularly relates to an integrated lean-premixed low-pollution combustor. Background Art

[0002] The premixed air in a traditional lean-premixed combustor is basically weakly swirling, and the mixing intensity with fuel is not high. Moreover, the manifold, nozzle, and head of the flame tube in the traditional combustor are separate single parts, which are heavy, costly, and complex to assemble. Summary of the Invention

[0003] In view of the above problems, the present invention provides an integrated lean-premixed low-pollution combustor, including: multiple main module total integrations, multiple sub-module total integrations, and a head profile. Each group of the main module total integrations is circumferentially arranged on the head profile, and a sub-module total integration is provided in the central region of each group of the main module total integrations. Each group of the main module total integrations includes multiple main module premixing tubes, multiple main module direct injection tubes, and multiple main module oil paths. Adjacent main module premixing tubes are connected through corresponding main module oil paths and form multiple annular structures on the head profile. Each sub-module total integration is in the central region of the corresponding annular structure. The multiple main module direct injection tubes are respectively arranged on the corresponding main module oil paths, and each main module direct injection tube is connected to one main module oil path.

[0004] Optionally, the multiple main module premixing tubes include a two-stage reverse swirler, a premixing tube oil path, and a premixing cylinder body. The two-stage reverse swirler is connected to the premixing cylinder body, and multiple premixing tube oil paths are circumferentially arranged along the inner circumference of the cylinder wall of the premixing cylinder body. The multiple premixing tube oil paths are all connected to the premixing cylinder body.

[0005] Optionally, the two-stage reverse swirler is provided with a central hole, and the central hole is connected to the premixing cylinder body.

[0006] Optionally, multiple injection holes are provided on the cylinder wall of the premixing cylinder body and are connected to the premixing tube oil paths through the multiple injection holes.

[0007] Optionally, the inner diameter of the outlet of the premixing cylinder body is smaller than the inner diameter of the cylinder body of the premixing cylinder body.

[0008] Optionally, the multiple main module direct injection tubes include an oil path tube and a direct injection tube. The oil path tube is connected to the corresponding main module oil path. One end of the direct injection tube is connected to the oil path tube, and the other end extends to the other side of the head profile.

[0009] Optionally, a plurality of the secondary module assemblies include a secondary module nozzle, a secondary module swirler, a secondary module oil pipeline branch, and a secondary module main pipeline. The secondary module nozzle is connected to one end of the secondary module oil pipeline branch and is communicated through internal channels respectively provided. The secondary module swirler is sleeved on the secondary module oil pipeline branch. One end of the secondary module main pipeline is connected to the other end of the secondary module oil pipeline branch and is communicated through flow channels respectively provided. The other end of the secondary module main pipeline is communicated with an external pipeline.

[0010] Optionally, the secondary module nozzle includes an outer housing and a secondary oil pipeline swirler. One end of the outer housing is threadedly connected to the secondary module oil pipeline branch, and the other end has a nozzle. The secondary oil pipeline swirler is arranged inside the outer housing.

[0011] Optionally, each set of the primary module assemblies further includes a primary module main pipeline, and the primary module main pipeline is communicated with the oil pipeline channel of the corresponding primary module premixing pipe.

[0012] Optionally, it further includes an outer flame tube, an inner flame tube, and a casing. Multiple sets of the primary module assemblies, multiple secondary module assemblies, and the head profile form the head of the flame tube. The outer flame tube and the inner flame tube are concentrically arranged. The head of the flame tube is arranged between the outer flame tube and the inner flame tube and is respectively connected to the outer flame tube and the inner flame tube. Both the outer flame tube and the inner flame tube are located inside the casing.

[0013] The integrated lean-premixed low-pollution combustor provided by the present invention has the following advantages compared with the prior art:

[0014] Through the head of the flame tube integrated by multiple sets of primary module assemblies, multiple secondary module assemblies, and the head profile, as well as the structural settings or assemblies among multiple primary module premixing pipes, multiple primary module direct injection pipes, and multiple primary module oil pipelines in each set of the primary module assemblies, a highly integrated head of the flame tube is formed, enabling this structure to reduce the weight of the combustor, simplify the assembly, reduce the weight, and lower the cost. Additionally, through the arrangement among the double-stage reverse swirler, the premixing pipe oil pipeline, and the premixing cylinder body in the primary module premixing pipe, the premixed oil and gas mixture is strongly swirling locally while weakly swirling as a whole, and its mixing is more uniform, which is beneficial to further reducing pollutant emissions.

[0015] Other features and advantages of the present invention will be described in the subsequent specification, and, in part, will be obvious from the specification or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures pointed out in the specification and the drawings. Brief Description of the Drawings

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 Shows a schematic diagram of the head of the flame tube of the integrated lean-premixed low-pollution combustor in the embodiment of the present invention;

[0018] Figure 2 Shows Figure 1 A cross-sectional schematic diagram of the head of the flame tube shown in the A-A direction;

[0019] Figure 3 Shows a schematic diagram of the overall integration of the main mold of the integrated lean-premixed low-pollution combustor in the embodiment of the present invention;

[0020] Figure 4 Shows Figure 3 A side schematic diagram of the premixing tube of the main mold of the integrated lean-premixed low-pollution combustor in the embodiment of the present invention;

[0021] Figure 5 Shows a front schematic diagram of the premixing tube of the main mold of the integrated lean-premixed low-pollution combustor in the embodiment of the present invention;

[0022] Figure 6 Shows a schematic diagram of the overall integration of the sub-mold of the integrated lean-premixed low-pollution combustor in the embodiment of the present invention;

[0023] Figure 7 Shows a schematic diagram of the direct injection tube of the main mold of the integrated lean-premixed low-pollution combustor in the embodiment of the present invention;

[0024] Figure 8 Shows Figure 3 Or Figure 7 A schematic diagram of the cross-section of the direct injection tube of the main mold along the B-B direction in ;

[0025] Figure 9 Shows a schematic diagram of the overall view of the integrated lean-premixed low-pollution combustor in the embodiment of the present invention.

[0026] In the figure, 1 is the head of the flame tube; 2 is the outer ring of the flame tube; 3 is the inner ring of the flame tube; 4 is the casing; 11 is the main mold total integration; 12 is the sub-mold total integration; 13 is the head profile; 14 is the main mold main pipe; 101 is the main mold premix pipe; 103 is the main mold direct injection pipe; 102 is the main mold oil circuit; 111 is the two-stage reverse swirler; 112 is the premix pipe oil circuit; 113 is the premix cylinder; 114 is the central hole; 115 is the injection hole; 1032 is the oil circuit pipe; 1031 is the direct injection pipe; 120 is the sub-mold nozzle; 121 is the outer casing; 122 is the sub-oil circuit swirler; 123 is the nozzle; 124 is the sub-mold swirler; 125 is the sub-mold oil circuit branch pipe; 126 is the sub-mold main pipe. Detailed implementation manners

[0027] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] As Figure 1 shown, the present invention provides an integrated lean-premixed low-pollution combustor, including: multiple groups of main mold total integrations 11, multiple sub-mold total integrations 12, and a head profile 13. Each group of main mold total integrations 11 is circumferentially arranged on the head profile 13 respectively, and a sub-mold total integration 12 is provided in the central area of each group of main mold total integrations 11, as Figure 2 and Figure 3As shown, each main module total assembly 11 includes multiple main module premixing pipes 101, multiple main module direct injection pipes 103, and multiple main module oil circuits 102. Adjacent main module premixing pipes 101 are connected through corresponding main module oil circuits 102 and form multiple annular structures on the head surface 13. Each sub-module total assembly 12 is in the central area of the corresponding annular structure. Multiple main module direct injection pipes 103 are respectively arranged on corresponding main module oil circuits 102, and each main module direct injection pipe 103 is connected to a main module oil circuit 102. By arranging the main module total assembly 11 and the sub-module total assembly 12 on the upper head surface 13, and integrating multiple main module premixing pipes 101, multiple main module direct injection pipes 103, and multiple main module oil circuits 102 in each group of main module total assemblies 11 on the head surface 13, the weight of the combustion chamber is reduced, the assembly is simplified, and the cost is lowered. Moreover, through the main module premixing pipe 101, the air flow in each area on the head surface 13 can adopt a double-stage shear method, and the fuel is injected at multiple points. In this way, the premixed oil and gas mixture is strongly swirling locally but weakly swirling as a whole, and the oil and gas mixture will be more uniform, which is beneficial to further reducing pollution emissions. Optionally, each flame tube head 1 has multiple main module premixing pipes 101. Assuming the number is n, they are circumferentially evenly distributed around the center of the sub-module total assembly 12. Assuming the number of heads of the flame tube head 1 is m, then the number of main module premixing pipes 101 on the flame tube is . Optionally, the main module oil circuit 102 is in a circular groove structure, and its main function is to connect the oil passage channels between different main module premixing pipes 101.

[0029] As Figure 4 shown, in an embodiment, multiple main module premixing pipes 101 include a double-stage reverse swirler, a premixing pipe oil circuit 112, and a premixing cylinder 113. The double-stage reverse swirler 111 is connected to the premixing cylinder 113, and multiple premixing pipe oil circuits 112 are arranged along the inner circumference of the cylinder wall of the premixing cylinder 113, and multiple said premixing pipe oil circuits 112 are all connected to the premixing cylinder 113. Through the double-stage reverse swirler 111, the air flow in each area adopts a double-stage shear method, so that the premixed oil and gas mixture is strongly swirling locally but weakly swirling as a whole, and its mixture will be more uniform, which is beneficial to further reducing pollution emissions. At the same time, the kinetic energy of the fuel flowing in the flame tube head 1 formed by multiple main module total assemblies 11, multiple sub-module total assemblies 12, and the head surface 13 at the head can cool the head. Optionally, the double-stage reverse swirler is in an annular structure, one of the swirlers is a forward swirler, and the other is a reverse swirler. Two reverse swirls are generated by the double-stage reverse swirler, and these two swirls are generated in a space with a very small radius, so the swirl intensity is very strong, providing strong power for the oil and gas mixture.

[0030] In one embodiment, the double-stage reverse cyclone is provided with a central hole 114, and the central hole 114 communicates with the premixing cylinder 113. Through the central hole 114, a backflow area is prevented from forming at the outlet of the double-stage reverse cyclone, and the outlet of the main mold premixing pipe 101 is burned.

[0031] As Figure 4 and Figure 5 shown, in one embodiment, a plurality of injection holes 115 are provided on the premixing cylinder 113, and the plurality of injection holes 115 communicate with the premixing pipe oil path 112. Optionally, the injection holes 115 are small holes for multi-point injection, and these small holes are circumferentially uniformly distributed around the center of the main mold premixing pipe 101. The oil ejected through the injection holes 115 is more uniform, which is beneficial to more uniform mixing of oil and gas in the premixing pipe oil path 112.

[0032] In one embodiment, the inner diameter of the outlet of the premixing cylinder 113 is smaller than the inner diameter of the cylinder body of the premixing cylinder 113. It should be noted that the outlet of the premixing cylinder 113 is a reduced opening, and through this reduced opening, the oil-gas mixture accelerates to flow at the outlet, forming a detached flame.

[0033] As Figure 7 and Figure 8 shown, in one embodiment, the plurality of main mold direct injection pipes 103 include an oil path pipe 1032 and a direct injection pipe 1031. The oil path pipe 1032 communicates with the corresponding main mold oil path 102. One end of the direct injection pipe 1031 communicates with the oil path pipe 1032, and the other end extends to the other side of the head surface 13. Optionally, a plurality of main mold direct injection pipes 103 can be circumferentially arranged on the head surface 13. Among them, the direct injection pipe 1031 can pass through the head surface 13 and a plurality of direct injection pipes 1031 can be circumferentially arranged along the head surface 13, so that the direct injection pipe 1031 can burn outside the head of the flame tube 1. Its main function is to stabilize the flame of the main mold in the small state (the state with less fuel supply during the ignition process), and to assist in connecting the flames of the main mold.

[0034] As Figure 6As shown, in one embodiment, the plurality of sub-module total assemblies 12 include a sub-module nozzle 120, a sub-module swirler 124, a sub-module oil path branch pipe 125, and a sub-module main pipe 126. The sub-module nozzle 120 is connected to one end of the sub-module oil path branch pipe 125 and is communicated through the internal channels each has. The sub-module swirler 124 is sleeved on the sub-module oil path branch pipe 125. One end of the sub-module main pipe 126 is connected to the other end of the sub-module oil path branch pipe 125 and is communicated through the flow channels each has. The other end of the sub-module main pipe 126 is communicated with an external pipeline. It should be noted that during ignition, the sub-module total assembly 12 can supply oil required for ignition, and the main-module total assembly 11 mainly provides gas and finally makes the oil and gas mix evenly. It should be noted that the sub-module main pipe 126 is similar to an ordinary main pipe, and its main function is to connect the oil path channels between different head sub-modules, and a structure for connecting an external pipeline can be designed on it. The oil sprayed out is made smoother through the sub-module nozzle 120. The sub-module oil path branch pipe 125 and the sub-module main pipe 126 supply oil to the sub-module nozzle 120, and the sub-module swirler 124 provides swirling air for the sub-module, enabling the supply of oil to the sub-module nozzle 120 to be more smooth.

[0035] In one embodiment, the sub-module nozzle 120 includes a housing 121 and a sub-oil path swirler 122. One end of the housing 121 is threadedly connected to the sub-module oil path branch pipe 125, and the other end has a nozzle 123. The sub-oil path swirler 122 is arranged inside the housing 121. The oil inside the housing 121 is made to flow out of the housing outlet more smoothly through the sub-oil path swirler 122. Optionally, a nozzle 123 is provided at the outlet of the housing 121 to facilitate the outflow of oil. One end of the housing 121 is threadedly connected to the sub-module oil path branch pipe 125, which is convenient for disassembling or repairing the sub-module oil path branch pipe 125 and the housing 121, and can also replace the sub-module oil path branch pipe 125 or the housing 121 of different sizes or models.

[0036] As Figure 9 As shown, in one embodiment, each group of main-module total assemblies 11 further includes a main-module main pipe 14, and the main-module main pipe 14 is communicated with the oil path channel of the corresponding main-module premixing pipe 101. It should be noted that the main-module main pipe 14 is similar to an ordinary main pipe, and its main function is to connect the oil path channels between different head main-modules. For example, it can connect the premixing pipe oil path 112, and a structure for connecting an external pipeline can be designed on the main-module main pipe 14 to connect with an external pipeline.

[0037] In one embodiment, it further includes an outer ring 2 of the combustion chamber liner, an inner ring 3 of the combustion chamber liner, and a casing 4. Multiple groups of main mold total assemblies 11, multiple sub-mold total assemblies 12, and a head profile 13 form the head 1 of the combustion chamber liner. The outer ring 2 of the combustion chamber liner and the inner ring 3 of the combustion chamber liner are concentrically arranged. The head 1 of the combustion chamber liner is arranged between the outer ring 2 of the combustion chamber liner and the inner ring 3 of the combustion chamber liner and is respectively connected to the outer ring 2 of the combustion chamber liner and the inner ring 3 of the combustion chamber liner. Both the outer ring 2 of the combustion chamber liner and the inner ring 3 of the combustion chamber liner are located inside the casing 4. Thus, the integrated design of the head 1 of the combustion chamber liner is realized between the outer ring 2 of the combustion chamber liner and the inner ring 3 of the combustion chamber liner. In addition, a combustion chamber is formed between the outer ring 2 of the combustion chamber liner and the inner ring 3 of the combustion chamber liner. The casing 4 can protect the outer ring 2 of the combustion chamber liner and the inner ring 3 of the combustion chamber liner.

[0038] Optionally, the head profile 13 is of an annular structure. Each group of main mold total assemblies 11 has 5 - 8 main mold premixing pipes 101. The number of main mold premixing pipes 101 corresponds to the number of main mold oil circuits 102. In this application, there are 6 main mold premixing pipes 101 and 6 main mold oil circuits 102. The 6 main mold premixing pipes 101 are arranged in a ring on the head profile 13. The main mold premixing pipes 101 are connected through the main mold oil circuits 102. A corresponding sub-mold total assembly 12 is arranged at the center position of the ring. The number of sub-mold total assemblies 12 is 1, that is, there is 1 sub-mold total assembly 12 at the center position corresponding to each ring. Finally, the sub-mold total assemblies 12 are arranged circumferentially along the head profile 13. Among them, the distance between each group of main mold total assemblies 11 is the same.

[0039] In summary, for the main mold total assemblies 11, sub-mold total assemblies 12, and head profile 13 in terms of the structure of this application, they can be processed by 3D printing, making the formed head 1 of the combustion chamber liner have a higher degree of integration, enabling this structure to reduce the weight of the combustion chamber, simplify the assembly, and reduce the cost. In terms of performance, the main mold adopts the multi-region injection method. The air flow in each region adopts the double-stage shear method, and the fuel adopts multi-point injection. In this way, the pre-mixed oil and gas mixture is strongly swirling locally, but weakly swirling as a whole, and its mixing will be more uniform, which is beneficial to further reducing pollutant emissions.

[0040] Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An integrated lean-premixed low-pollution combustor, characterized in that, Including: Multiple groups of main mold total assemblies (11), multiple sub - mold total assemblies (12), and a head surface (13). Each group of the main mold total assemblies (11) is circumferentially arranged on the head surface (13). A sub - mold total assembly (12) is provided in the central area of each group of the main mold total assemblies (11). Each group of the main mold total assemblies (11) includes multiple main mold premixing pipes (101), multiple main mold direct injection pipes (103), and multiple main mold oil circuits (102). Adjacent main mold premixing pipes (101) are connected through the corresponding main mold oil circuits (102) and form multiple annular structures on the head surface (13). Each sub - mold total assembly (12) is in the central area of the corresponding annular structure. Multiple main mold direct injection pipes (103) are respectively arranged on the corresponding main mold oil circuits (102), and each main mold direct injection pipe (103) is connected to one main mold oil circuit (102).

2. The integrated lean-premixed low-pollution combustor according to claim 1, characterized in that, The multiple main mold premixing pipes (101) include a two - stage reverse swirler (111), a premixing pipe oil circuit (112), and a premixing cylinder body (113). The two - stage reverse swirler (111) is connected to the premixing cylinder body (113). A plurality of the premixing pipe oil circuits (112) are circumferentially arranged along the inner circumference of the barrel wall of the premixing cylinder body (113), and the multiple premixing pipe oil circuits (112) are all connected to the premixing cylinder body (113).

3. The integrated lean-premixed low-emission combustor according to claim 2, wherein The two - stage reverse swirler is provided with a central hole (114), and the central hole (114) is connected to the premixing cylinder body (113).

4. The integrated lean-premixed low-pollution combustor according to claim 2, characterized in that, A plurality of injection holes (115) are provided on the barrel wall of the premixing cylinder body (113), and are connected to the premixing pipe oil circuits (112) through the multiple injection holes (115).

5. The integrated lean-premixed low-pollution combustor according to claim 2, characterized in that, The inner diameter of the outlet of the premixing cylinder body (113) is smaller than the inner diameter of the barrel of the premixing cylinder body (113).

6. The integrated lean-premixed low-emission combustor according to claim 1, wherein The multiple main mold direct injection pipes (103) include an oil circuit pipe (1032) and a direct injection pipe (1031). The oil circuit pipe (1032) is connected to the corresponding main mold oil circuit (102). One end of the direct injection pipe (1031) is connected to the oil circuit pipe (1032), and the other end extends to the other side of the head surface (13).

7. The integrated lean-premixed low-pollution combustor according to claim 1, characterized in that, The multiple sub - mold total assemblies (12) include a sub - mold nozzle (120), a sub - mold swirler (124), a sub - mold oil circuit branch pipe (125), and a sub - mold main pipe (126). The sub - mold nozzle (120) is connected to one end of the sub - mold oil circuit branch pipe (125) and is connected through their respective internal channels. The sub - mold swirler (124) is sleeved on the sub - mold oil circuit branch pipe (125). One end of the sub - mold main pipe (126) is connected to the other end of the sub - mold oil circuit branch pipe (125) and is connected through their respective flow channels. The other end of the sub - mold main pipe (126) is connected to an external pipeline.

8. The integrated lean-premixed low-emission combustor according to claim 7, wherein The sub-model nozzle (120) includes a housing (121) and a sub-oil passage swirler (122). One end of the housing (121) is threadedly connected to the sub-model oil passage branch pipe (125), and the other end has a nozzle (123). The sub-oil passage swirler (122) is disposed inside the housing (121).

9. The integrated lean-premixed low-pollution combustor according to claim 1, wherein Each set of the main model total assembly (11) further includes a main model main pipe (14), and the main model main pipe (14) is communicated with the oil passage of the corresponding main model premixing pipe (101).

10. The integrated lean-premixed low-pollution combustor according to claim 1, characterized in that, It further includes a flame tube outer ring (2), a flame tube inner ring (3) and a casing (4). Multiple sets of the main model total assemblies (11), multiple sub-model total assemblies (12) and the head profile (13) form a flame tube head (1). The flame tube outer ring (2) and the flame tube inner ring (3) are concentrically arranged. The flame tube head (1) is disposed between the flame tube outer ring (2) and the flame tube inner ring (3) and is respectively connected to the flame tube outer ring (2) and the flame tube inner ring (3). Both the flame tube outer ring (2) and the flame tube inner ring (3) are located inside the casing (4).

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