A fuel main pipe for a gaseous fuel engine and an engine

Abstract

The present invention discloses a fuel main pipe and an engine for a gaseous fuel engine. The fuel main pipe comprises: a gas pipeline having an annular cavity inside thereof and an outlet end and an inlet end along its axial direction; a baffle group installed in the gas pipeline, consisting of N baffles arranged along the axial direction of the gas pipeline, each baffle having at least two axial through holes, and the N baffles dividing the cavity in the gas pipeline into N+1 chambers, N≥1; a plurality of circumferentially evenly distributed branch pipe outlets installed on the outlet end of the gas pipeline and connected to the gas pipeline; and at least one fuel inlet, arranged at the inlet end of the gas pipeline. The fuel can be evenly transported to the branch pipe outlet after step-by-step pressure stabilization through the baffles, ensuring the fluid pressure balance and fluid flow balance at each branch pipe outlet.

Description

Technical Field

[0001] The invention belongs to the technical field of gas turbine engines, and in particular relates to a fuel main pipe of a gaseous fuel engine and an engine. Background Art

[0002] As global warming intensifies and the earth's reserves of fossil energy decrease, major countries are looking for renewable clean energy to replace fossil energy. Among them, methane, methanol, ethanol, hydrogen, etc. have become hot spots in the research of renewable clean energy applications.

[0003] Most of the energy used by humans comes from the conversion of fuel after combustion. Among them, the energy in the fields of aerospace power, ground power stations, and ship power mostly relies on gas turbine power devices. At present, gas turbine engines mainly use liquid as fuel, and their fuel systems, especially fuel mains, are not suitable for gas fuels or liquid fuels with properties close to gas to organize fuel and achieve energy conversion efficiently.

[0004] At present, since the fuel of gas turbine engines is mostly liquid fuels such as aviation kerosene, light diesel, and heavy oil, the existing fuel mains of gas turbine engines are generally single-tube fuel mains designed according to the characteristics of liquid fuel; after the pressure is stabilized by the large-diameter main, the fuel pressure at the branch outlet is basically the same, but when using gas fuel, simulation and experimental verification show that the single-tube main cannot guarantee the pressure and flow balance of the fuel or liquid fuel with close gas characteristics at the outlet of each branch; therefore, the single-tube fuel main is not suitable for gas fuel or liquid fuel with close gas characteristics. Summary of the invention

[0005] In order to overcome the defects of the above-mentioned prior art, the purpose of the present invention is to improve the problem of uneven pressure and flow at the outlets of each branch pipe in the fuel main pipe. To achieve the above-mentioned purpose, the present invention provides the following technical solutions:

[0006] A fuel main pipe for a gaseous fuel engine comprises a gas transmission pipeline having a circular ring-shaped cavity inside thereof and having an outlet end and an inlet end along its axial direction;

[0007] A baffle group is installed in the gas pipeline, and is composed of N baffles arranged along the axial direction of the gas pipeline, each baffle is provided with at least two axial through holes, and the N baffles divide the cavity in the gas pipeline into N+1 chambers, N≥1;

[0008] A plurality of branch pipe outlets evenly distributed around the circumference are installed on the outlet end of the gas pipeline and communicated with the gas pipeline;

[0009] At least one fuel inlet is arranged at the inlet end of the gas pipeline.

[0010] Furthermore, in two adjacent partitions, the through holes are arranged alternately.

[0011] Furthermore, the closer to the outlet end, the more through holes there are on the partition.

[0012] Furthermore, the number of branch pipe outlets is N1, the number of through holes in the partition closest to the outlet end is N2, when N1 is an even number, N1=2N2, when N1 is an odd number, N2 is half of N1 rounded to the nearest even number.

[0013] Furthermore, in two adjacent partitions, the number of through holes in the partition closer to the outlet end is N3, and the number of through holes in the partition closer to the inlet end is N4. When N3 is an even number, N3=2N4, and when N3 is an odd number, N4 is half of N3 rounded to the nearest even number.

[0014] Furthermore, the two adjacent partitions include a partition A closer to the outlet end and a partition B closer to the inlet end, wherein the partition A is provided with a through hole A, and the partition B is provided with a through hole B;

[0015] Two through holes A adjacent to the through hole B are disposed on both sides thereof, and the distances between the two through holes A and the through hole B are equal.

[0016] Furthermore, the partition closest to the inlet end has two through holes adjacent to the fuel inlet, and the two through holes are equidistant from the fuel inlet.

[0017] Furthermore, the sum of the cross-sectional areas of the fuel inlet and the sum of the cross-sectional areas of all the through holes in a single partition are greater than or equal to the sum of the cross-sectional areas of the inner holes of all the branch pipe outlets.

[0018] Furthermore, the cross-sectional area of ​​any one of the chambers is greater than the sum of the cross-sectional areas of the inner holes of all the branch pipe outlets.

[0019] Furthermore, the fuel inlet comprises: a connecting section and a threaded section, the connecting section is inserted into the gas pipeline and connected to the gas pipeline, and the threaded section is communicated with the connecting section and is integrally arranged.

[0020] Furthermore, two hanging platforms are symmetrically provided on both sides of the threaded section, and hanging platform threads are provided inside the hanging platforms.

[0021] An engine comprises: a casing, a combustion chamber installed in the casing, a gaseous fuel engine fuel manifold, a compressor and a turbine, wherein the gaseous fuel engine fuel manifold is installed in the casing and is used to provide gaseous fuel to the combustion chamber; the compressor is connected to the combustion chamber; and the turbine is connected to the drive shaft of the compressor.

[0022] Technical effects and advantages of the present invention:

[0023] In the present invention, the fuel can be evenly delivered to the branch pipe outlet after being stabilized step by step through the partition, ensuring the balance of fluid pressure and fluid flow at the outlets of each branch pipe, thereby improving the thermal cycle efficiency of the gaseous fuel engine and solving a major obstacle to the application of renewable clean energy in the fields of aerospace power, ground energy, and ship power. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of a fuel main pipe of a gaseous fuel engine in the prior art;

[0025] Figure 2 It is a structural schematic diagram of a fuel main pipe of a gaseous fuel engine of the present invention;

[0026] Figure 3 A cross-sectional view of a fuel main pipe of a gaseous fuel engine according to the present invention;

[0027] Figure 4 It is a structural schematic diagram of a fuel inlet pipe in a fuel main pipe of a gas fuel engine of the present invention;

[0028] Figure 5 It is a structural schematic diagram of a first partition in a fuel main pipe of a gas fuel engine of the present invention;

[0029] Figure 6 It is a structural schematic diagram of a second partition in a fuel main pipe of a gas fuel engine according to the present invention;

[0030] Figure 7 It is a structural schematic diagram of a third partition plate in a fuel main pipe of a gas fuel engine of the present invention;

[0031] Figure 8 It is a structural schematic diagram of an engine of the present invention;

[0032] In the figure: 1. Ring main pipeline;

[0033] 2. Branch pipe outlet;

[0034] 3. Fuel inlet pipe;

[0035] 4. Gas pipeline; 401. First chamber; 402. Second chamber; 403. Third chamber; 404. Fourth chamber;

[0036] 5. baffle group; 501. first baffle; 5011. first through hole; 502. second baffle; 5021. second through hole; 503. third baffle; 5031. third through hole;

[0037] 6. Fuel inlet; 601. Connecting section; 602. Threaded section; 603. Hanging platform; 604. Hanging platform screw hole;

[0038] 101. Casing; 102. Fuel main; 103. Turbine; 104. Combustion chamber; 105. Compressor. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In addition, in the invention, the terms "first", "second" and other similar words are not intended to imply any order, quantity and importance, but are merely used to distinguish different elements, and the terms "upper", "lower", "left", "right" and other similar words are merely positional relationships in the drawings.

[0041] Existing gaseous fuel engine fuel main pipe, such as Figure 1 As shown, it is composed of an annular main pipe 1, 16 branch pipe outlets 2 and two gas inlet pipes 3. The fuel is sent into the annular main pipe 1 through the gas inlet pipe 3, and then the fuel is evenly sent out through several branch pipe outlets 2. However, the actual situation is that the closer the branch pipe outlet 2 is to the gas inlet pipe 3, the higher the air pressure is, and the farther the branch pipe outlet 2 is from the gas inlet pipe 3, the lower the air pressure is. Therefore, it is impossible to ensure that the pressure and flow of the fuel at each branch pipe outlet are balanced. In the following several embodiments, how to solve the above problems through the technical solution in this application will be described in detail.

[0042] Embodiment 1:

[0043] See also Figure 2-7 A fuel main pipe for a gaseous fuel engine, comprising: a gas pipeline 4, a baffle group 5, a branch pipe outlet 2 and a fuel inlet 6; the gas pipeline 4 has an annular cavity inside, and has an outlet end and an inlet end along the axial direction of the gas pipeline 4; the baffle group 5 is composed of a first baffle 501, a second baffle 502 and a third baffle 503 arranged along the axial direction of the gas pipeline 4, and the three baffles divide the cavity in the gas pipeline 4 into a first chamber 401, a second chamber 402, a third chamber 403 and a fourth chamber 404;

[0044] like Figure 5-7As shown, a plurality of axially arranged first through holes 5011, second through holes 5021 and third through holes 5031 are respectively arranged in the first baffle 501, the second baffle 502 and the third baffle 503, wherein the first through hole 5011 connects the first chamber 401 with the second chamber 402, the second through hole 5021 connects the second chamber 402 with the third chamber 403, and the third through hole 5031 connects the third chamber 403 with the fourth chamber 404, and the first through holes 5011, the second through holes 5021 and the third through holes 5031 are staggered, that is, there is no intersection area between the first through hole 5011 and the second through hole 5021 and between the second through hole 5021 and the third through hole 5031, and the number of the first through holes 5011, the second through holes 5021 and the third through holes 5031 gradually decreases;

[0045] On the other hand, the fuel inlet 6 is installed on the outer wall of the fourth chamber 404, and a plurality of branch pipe outlets 2 are installed at the outlet end of the gas pipeline 4. After the fuel enters the fourth chamber 404 through the feed port 6, it enters the third chamber 403 through the third through hole 5031, enters the second chamber 402 through the second through hole 5021, and enters the first chamber 401 through the first through hole 5011. When the fuel moves in the four chambers, it is stabilized layer by layer through three groups of through holes, and is finally discharged evenly from the branch pipe outlet 2.

[0046] Furthermore, if Figure 5 As shown, the number of branch pipe outlets 2 is 16, the number of first through holes 5011 is 8, each first through hole 5011 is provided with a branch pipe outlet 2 on both sides, and two branch pipe outlets 2 are provided between two adjacent first through holes 5011;

[0047] As the optimal solution in this embodiment, each first through hole 5011 is equidistant from the branch pipe outlets 2 on both sides thereof, thereby further ensuring that the fluid pressure and flow rate at each branch pipe outlet 2 are uniform;

[0048] Similarly, if Figure 6 As shown, the number of the second through holes 5021 is four, and a first through hole 5011 is respectively provided on both sides of each second through hole 5021, and two first through holes 5011 are provided between two adjacent second through holes 5021;

[0049] As the optimal solution in this embodiment, each second through hole 5021 is equidistant from the first through holes 5011 on both sides thereof, thereby further ensuring that the pressure and flow rate in each first through hole 5011 are uniform;

[0050] Similarly, if Figure 7As shown, the number of the third through holes 5031 is two, and a second through hole 5021 is respectively provided on both sides of each third through hole 5031, and two second through holes 5021 are provided between two adjacent third through holes 5031;

[0051] As the optimal solution in this embodiment, each third through hole 5031 is equidistant from the second through holes 5021 on both sides thereof, thereby further ensuring that the pressure and flow rate in each first through hole 5021 are uniform.

[0052] Furthermore, to ensure that the fluid pressure and flow rate at the third through hole 5031 are the same, the number of fuel inlet pipes 3 can be two or one. When the number of fuel inlet pipes 3 is two, as long as the connecting line between the two fuel inlet pipes 3 passes through the axis of the gas pipeline 4, the positions of the two fuel inlet pipes 3 will not affect the fluid pressure and flow rate at the third through hole 5031; when the number of fuel inlet pipes 3 is one, as long as the fuel inlet pipe 3 is located in the middle position of the two third through holes 5031, it will be sufficient.

[0053] In addition, the first through hole 5011, the second through hole 5021, the third through hole 5031 and the branch pipe outlet 2 should be evenly distributed around the circumference. In addition, in order to ensure the stability of the air pressure in the gas pipeline 4 and the stability of the air pressure at the branch pipe outlet 2, it should also be ensured that the total area of ​​the through holes on each partition is not less than the sum of the cross-sectional areas of the branch pipe outlet 2, but is much smaller than the cross-sectional area of ​​each chamber, that is:

[0054] S 燃料进口截面积之和 , S 第一通孔截面积和 , S 第二通孔截面积和 , S 第三通孔截面积和 ≥S 支管出口截面积和 .

[0055] Further, see Figure 4 The fuel inlet 6 includes: a connecting section 601, a threaded section 602, a hanging platform 603 and a hanging platform thread 604, wherein the connecting section 601 is inserted into the gas pipeline 4 and welded to the gas pipeline 4, the threaded section 602 is connected to the connecting section 601 and is used to connect to an external pipeline, and the hanging platform 603 and the hanging platform thread 604 are used to fix and install the entire fuel main pipe.

[0056] It should be noted that the number of the partitions, the first through hole 5011, the second through hole 5021, the third through hole 5031 and the branch outlet 2 described in the present embodiment is only an example. In reality, the number of partitions and the number of through holes in the partitions can be adjusted according to the number of branch outlets 2. For example, when the number of branch outlets 2 is 32, the number of partitions can be 3 or 4. When the number of partitions is 4, the number of through holes in the partitions is 16, 8, 4, and 2, respectively. When the number of partitions is 3, the number of through holes in the partitions is 16, 8, and 4, respectively.

[0057] The above example is explained again. The first partition 501 and the number of first through holes 5011 are set according to the number of branch outlets 2. The number of first through holes 5011 is half of the number of branch outlets 2. When the number of branch outlets 2 is an odd number, the number of first through holes 5011 is rounded to the nearest even value, and the number of second through holes 5021 is half of the number of first through holes 5011, and so on. When the number of through holes in a partition is two, three or four, no partition is required.

[0058] Embodiment 2:

[0059] The composition and working principle of a fuel manifold of a gaseous fuel engine in the present invention are described in detail in Example 1. This embodiment provides a gaseous fuel engine based on the fuel manifold of a gaseous fuel engine in Example 1. Specifically:

[0060] like Figure 8 As shown, a gas fuel engine comprises: a casing 101, a fuel manifold 102, a turbine 103, a combustion chamber 104 and a compressor 105;

[0061] The combustion chamber 104 is fixedly installed in the casing 101, and the fuel main pipe 102 is installed on the right side of the combustion chamber 104, wherein the outlet end of the branch pipe outlet 2 in the fuel main pipe 102 is inserted in the combustion chamber 104, and is used to introduce gas fuel into the combustion chamber 104, and the compressor 105 is installed on the left side inside the casing 101, and is used to compress the gas fuel and send the compressed gas fuel into the fuel main pipe 102, and the turbine 103 is installed on the right side inside the casing 101, and the rotating shaft of the turbine 103 is connected to the driving shaft of the compressor 105. The turbine 103 rotates driven by the airflow, thereby providing power for the compressor 105.

[0062] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fuel manifold for a gaseous fuel engine, characterized in that: include: A gas transmission pipeline (4) having a circular ring-shaped cavity inside and having an outlet end and an inlet end along its axial direction; The partition plate group (5) is installed in the gas transmission pipeline (4) and is composed of N partition plates arranged along the axial direction of the gas transmission pipeline (4). Each partition is provided with at least two axial through holes, and N of the partitions divide the cavity in the gas transmission pipeline (4) into N+1 chambers, where N≥1; A plurality of branch pipe outlets (2) evenly distributed around the circumference are installed on the outlet end of the gas pipeline (4) and are in communication with the gas pipeline (4); at least one fuel inlet (6) disposed at the inlet end of the gas pipeline (4); In two adjacent partitions, the through holes are arranged alternately; The closer to the outlet end, the more through holes there are on the partition.

2. A gaseous fuel engine fuel manifold according to claim 1, characterized in that: The number of branch pipe outlets (2) is N1, and the number of through holes in the partition closest to the outlet end is N2. When N1 is an even number, N1=2N2, and when N1 is an odd number, N2 is half of N1 rounded to the nearest even number.

3. A gaseous fuel engine fuel manifold according to claim 2, characterized in that: In two adjacent partitions, the number of through holes in the partition closer to the outlet end is N3, and the number of through holes in the partition closer to the inlet end is N4. When N3 is an even number, N3=2N4, and when N3 is an odd number, N4 is half of N3 rounded to the nearest even number.

4. A gaseous fuel engine fuel manifold according to claim 3, characterized in that: The two adjacent partitions include a partition A closer to the outlet end and a partition B closer to the inlet end, wherein a through hole A is provided in the partition A and a through hole B is provided in the partition B; through hole B has two adjacent through holes A on both sides, and the distances between the two through holes A and through hole B are equal.

5. A gaseous fuel engine fuel manifold according to claim 1, characterized in that: The partition closest to the inlet end is provided with two through holes adjacent to the fuel inlet (6), and the distances between the two through holes and the fuel inlet (6) are equal.

6. A gaseous fuel engine fuel manifold according to claim 1, characterized in that: The sum of the cross-sectional areas of the fuel inlet (6) and the sum of the cross-sectional areas of all the through holes in a single partition are greater than or equal to the sum of the cross-sectional areas of the inner holes of all the branch pipe outlets (2).

7. A gaseous fuel engine fuel manifold according to claim 1, characterized in that: The cross-sectional area of ​​any one of the chambers is greater than the sum of the cross-sectional areas of the inner holes of all the branch pipe outlets (2).

8. A fuel manifold for a gaseous fuel engine according to any one of claims 1 to 7, characterized in that: The fuel inlet (6) comprises: a connecting section (601) and a threaded section (602); the connecting section (601) is inserted into the gas pipeline (4) and connected to the gas pipeline (4); the threaded section (602) is communicated with the connecting section (601) and is integrally arranged.

9. A gaseous fuel engine fuel manifold according to claim 8, characterized in that: Two hanging platforms (603) are symmetrically arranged on both sides of the threaded section (602), and hanging platform threads (604) are arranged inside the hanging platforms (603).

10. An engine, characterized in that: include: Casing (101); A combustion chamber (104) is installed in the casing (101); A fuel manifold for a gaseous fuel engine as claimed in any one of claims 1 to 9, installed in the casing (101), for providing gaseous fuel to the combustion chamber (104); A compressor (105) connected to the combustion chamber (104); A turbine (103) is connected to a driving shaft of the compressor (105).

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