Swirl with adjustable blade angle and combustion device

Abstract

The present invention provides a swirler and combustion device with adjustable blade angle, comprising: a central axis; an axially through-going cylinder, the cylinder is coaxially sleeved outside the central axis, and a plurality of chutes are arranged on the cylinder in a circular array with the cylinder axis as the center line; a plurality of swirl blades corresponding to the plurality of chutes one by one, all swirl blades are arranged in a circular array with the central axis axis as the center line in an annular flow space defined by the outer peripheral wall of the central axis and the inner peripheral wall of the cylinder, each swirl blade is rotatably arranged on the central axis, and a partial structure of each swirl blade is slidably arranged in the corresponding chute; when relative rotation occurs between the cylinder and the central axis, all swirl blades rotate synchronously around their own rotation axis. The present invention can flexibly adjust the guide angle of the swirl blade after the swirler is assembled, thereby changing the swirl number of the swirler, thereby improving the operating state of the gas turbine unit after the gas turbine unit is installed or during the operation of the gas turbine unit.

Description

Technical Field

[0001] The invention relates to the field of gas technology, and in particular to a swirler with adjustable blade angles and a combustion device. Background Art

[0002] At present, gas turbine burners generally use swirl blades to guide the flow direction of the airflow to generate swirl, thereby controlling the stable combustion process of the flow field in the combustion chamber. The geometric structure of the gas turbine burners currently on the market is fixed after installation, and the swirl number (an indicator to measure the strength of the swirl) generated by it is also determined accordingly.

[0003] In recent years, academic research and gas turbine application practice have shown that changing the swirl number will affect the combustion state in the combustion chamber. Properly adjusting the swirl blade angle of the burner and adjusting its swirl number can improve flame stability and combustion pollutant emission characteristics. However, traditional burners with fixed geometric structures do not have the means to adjust their swirl blade angles after installation. Summary of the invention

[0004] In view of the shortcomings of the prior art mentioned above, the technical problem to be solved by the present invention is to provide a swirler and a combustion device with adjustable blade angle, which can flexibly adjust the guide angle of the swirl blades after the swirler is assembled, thereby changing the swirl number of the swirler, so that after the gas turbine unit is installed or during the operation of the gas turbine unit, the guide angle of the swirl blades is changed, the purpose of changing the swirl number of the swirler is achieved, and the operating state of the gas turbine unit is improved.

[0005] In order to solve the above technical problems, the present invention provides a cyclone with adjustable blade angle, comprising:

[0006] Central axis;

[0007] An axially penetrating cylinder is coaxially sleeved outside the central axis, and a plurality of slide grooves are arranged on the cylinder in a circular array with the axis of the cylinder as the center line;

[0008] A plurality of swirl blades corresponding to the plurality of chutes one by one, all the swirl blades are arranged in a circular array with the central axis as the center line in an annular flow space defined by the outer peripheral wall of the central axis and the inner peripheral wall of the cylinder, each swirl blade is rotatably arranged on the central axis, and a part of the structure of each swirl blade is slidably arranged in the corresponding chute;

[0009] When relative rotation occurs between the cylinder and the central axis, all swirl blades rotate synchronously around their own rotation axes.

[0010] Preferably, mounting holes corresponding to the swirl blades are opened on the outer peripheral wall of the central axis; the swirl blades include a guide blade body, the guide blade body is provided with a petiole on the radial inner side of the central axis, the petiole is rotatably inserted in the mounting hole, and the guide blade body is provided with a sliding key that slides with the slide groove on the radial outer side of the central axis.

[0011] Preferably, the inner edge of the guide blade facing the central axis is in clearance fit with the outer peripheral wall of the central axis.

[0012] Preferably, the guide blade faces the outer edge of the cylinder and has a clearance fit with the inner circumferential wall of the cylinder.

[0013] Preferably, the slide groove passes through the inner circumferential wall and the outer circumferential wall of the cylinder.

[0014] Preferably, the slide groove extends in a direction parallel to the axis of the central shaft.

[0015] The present invention also provides a combustion device, comprising the swirler with adjustable blade angle.

[0016] As described above, the swirler and combustion device with adjustable blade angle of the present invention have the following beneficial effects:

[0017] In the swirler of the present invention, when relative rotation occurs between the cylinder and the central axis, since part of the structure of the swirl blade is slidably arranged in the corresponding chute and the swirl blade is rotatably arranged on the central axis, the part of the structure of the swirl blade moves circumferentially around the axis of the central axis while sliding along the extension direction of the chute driven by the cylinder, and at the same time, the swirl blade rotates around its own rotation axis to change the guide angle of the swirl blade. Therefore, the swirler with adjustable blade angle of the present invention can flexibly adjust the guide angle of the swirl blade after installation, thereby changing the swirl number of the swirler, so that after the gas turbine unit is installed, the guide angle of the swirl blade can be changed without disassembling the swirler, thereby achieving the purpose of changing the swirl number of the swirler.

[0018] The gas turbine unit of the power plant adopts the combustion device of the present invention, which can realize the control and adjustment of the guide angle of the swirl blades during operation. When the power plant encounters problems such as unstable combustion of the gas turbine unit or excessive pollutant emissions, changing the swirl number of the swirler can be used as an auxiliary means to the traditional solution to improve the operating state of the gas turbine unit without stopping the machine or interrupting the normal power generation plan. The gas turbine unit of the power plant adopts the above-mentioned combustion device, and by changing the guide angle of the swirl blades of the swirler, it can effectively suppress the combustion instability during operation and improve the operating state of the gas turbine unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1It is a schematic diagram showing the structure of a cyclone with adjustable blade angle according to the present invention;

[0020] Figure 2 Shown is a schematic diagram of the connection between the central shaft and the swirl blades;

[0021] Figure 3 Schematic diagram showing the motion of a swirler with adjustable blade angle.

[0022] Component number description

[0023] 1 Center axis

[0024] 11 Mounting holes

[0025] 2 Cylinder

[0026] 21 Chute

[0027] 3 Swirl blades

[0028] 31 Guide blade

[0029] 32 Petiole

[0030] 33 slide keys DETAILED DESCRIPTION

[0031] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0032] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0033] like Figure 1 , Figure 2 as well as Figure 3 As shown, the present invention provides a swirler with adjustable blade angle, comprising:

[0034] Central axis 1;

[0035] A cylinder 2 is axially penetrated, and the cylinder 2 is coaxially sleeved outside the central axis 1. The cylinder 2 is provided with a plurality of slide grooves 21 arranged in a circular array with the axis of the cylinder 2 as the center line;

[0036] A plurality of swirl blades 3 corresponding to the plurality of chute grooves 21 are arranged in a circular array with the axis of the central shaft 1 as the center line in an annular flow space defined by the outer peripheral wall of the central shaft 1 and the inner peripheral wall of the cylinder 2. Each swirl blade 3 is rotatably arranged on the central shaft 1, and a part of the structure of each swirl blade 3 is slidably arranged in the corresponding chute groove 21.

[0037] When relative rotation occurs between the cylinder 2 and the central shaft 1, all the swirl blades 3 rotate synchronously around their own rotation axes.

[0038] In the present invention, when the cylinder 2 and the central axis 1 rotate relative to each other, since part of the structure of the swirl blade 3 is slidably arranged in the corresponding chute 21 and the swirl blade 3 is rotatably arranged on the central axis 1, the part of the structure of the swirl blade 3 moves circumferentially around the axis of the central axis 1 while sliding along the extension direction of the chute 21 driven by the cylinder 2, and at the same time, the swirl blade 3 rotates around its own rotation axis to change the guide angle of the swirl blade 3. Therefore, the swirler with adjustable blade angle of the present invention can flexibly adjust the guide angle of the swirl blade 3 after installation, thereby changing the swirl number of the swirler, so that after the gas turbine unit is installed, the guide angle of the swirl blade 3 is changed without disassembling the swirler, so as to achieve the purpose of changing the swirl number of the swirler.

[0039] There are two embodiments of the relative rotation between the cylinder 2 and the central shaft 1: for example, the cylinder 2 is in a fixed state, the central shaft 1 is in transmission connection with a driving device, and the central shaft 1 performs fixed-axis rotation. For another example, the central shaft 1 is in a fixed state, the cylinder 2 is in transmission connection with a driving device, and the cylinder 2 performs fixed-axis rotation.

[0040] In order to rotatably set the swirl blade 3 on the central shaft 1, a mounting hole 11 corresponding to the swirl blade 3 is opened on the outer peripheral wall of the central shaft 1; the swirl blade 3 includes a guide blade body 31, and the guide blade body 31 is provided with a petiole 32 on the radial inner side of the central shaft 1, and the petiole 32 is rotatably inserted into the mounting hole 11. In order to form a sliding fit between a part of the structure of the swirl blade 3 and the slide groove 21, a sliding key 33 that slides with the slide groove 21 is provided on the radial outer side of the central shaft 1. Further, the sliding key 33 is provided at the corner of the guide blade body 31 that deviates from its own rotation axis.

[0041] In order to reduce the rotation resistance of the swirl blade 3 and make the swirl blade 3 rotate smoothly, the inner edge of the guide blade 31 facing the central axis 1 is in clearance with the outer peripheral wall of the central axis 1. Furthermore, the outer edge of the guide blade 31 facing the cylinder 2 is in clearance with the inner peripheral wall of the cylinder 2.

[0042] The above-mentioned slide groove 21 can be opened on the inner wall of the cylinder 2 and does not pass through the outer wall of the cylinder 2, so that it can be applied to some application scenarios requiring closedness; the above-mentioned slide groove 21 can also pass through the inner and outer walls of the cylinder 2.

[0043] The extension track of the above-mentioned slide groove 21 can be linear or curved. For example, the above-mentioned slide groove 21 extends in a direction parallel to the axis of the central shaft 1.

[0044] The present invention also provides a combustion device, comprising the above-mentioned swirler with adjustable blade angle.

[0045] The gas turbine unit of the power plant adopts the combustion device of the present invention, which can realize the control and adjustment of the guide angle of the swirl blades during operation. When the power plant encounters problems such as unstable combustion of the gas turbine unit or excessive pollutant emissions, changing the swirl number of the swirler can be used as an auxiliary means of the traditional solution to improve the operating state of the gas turbine unit without stopping the machine or interrupting the normal power generation plan. Specifically, the gas turbine unit of the power plant adopts the above-mentioned combustion device, and by changing the guide angle of the swirl blades of the swirler by 3 to 5 degrees, it can produce obvious beneficial effects on the operating state of the gas turbine unit. The appropriate change of the swirl number of the swirler can effectively suppress the combustion instability during operation. Therefore, the combustion device of the present invention has excellent market application potential.

[0046] In summary, the swirler and combustion device with adjustable blade angle of the present invention can flexibly adjust the guide angle of the swirl blade after the swirler is assembled, thereby changing the swirl number of the swirler, so that after the gas turbine unit is installed or during the operation of the gas turbine unit, the guide angle of the swirl blade is changed to achieve the purpose of changing the swirl number of the swirler and improve the operating state of the gas turbine unit. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has a high industrial utilization value.

[0047] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A cyclone with adjustable blade angle, characterized in that: include: Central axis (1); A cylinder (2) is axially penetrated, the cylinder (2) is coaxially sleeved outside the central axis (1), and the cylinder (2) is provided with a plurality of slide grooves (21) arranged in a circular array with the axis of the cylinder (2) as the center line; A plurality of swirl blades (3) corresponding one to the plurality of chute grooves (21), all the swirl blades (3) being arranged in a circular array with the axis of the central shaft (1) as the center line in an annular flow space defined by the outer peripheral wall of the central shaft (1) and the inner peripheral wall of the cylinder (2), each swirl blade (3) being rotatably arranged on the central shaft (1), and a part of the structure of each swirl blade (3) being slidably arranged in the corresponding chute groove (21); When the cylinder (2) and the central shaft (1) rotate relative to each other, all the swirl blades (3) rotate synchronously around their own rotation axes; The outer peripheral wall of the central axis (1) is provided with mounting holes (11) corresponding to the swirl blades (3) one by one; the swirl blades (3) include guide blade bodies (31); the guide blade bodies (31) are provided with blade petioles (32) on the radial inner side of the central axis (1); the blade petioles (32) are rotatably inserted into the mounting holes (11); and the guide blade bodies (31) are provided with sliding keys (33) slidably matched with the slide grooves (21) on the radial outer side of the central axis (1); The sliding key (33) is arranged at a corner of the guide blade (31) that deviates from its own rotation axis; The slide groove (21) extends in a direction parallel to the axis of the central axis (1); The extension track of the slide groove (21) is linear.

2. The cyclone with adjustable blade angle according to claim 1, characterized in that: The inner edge of the guide blade (31) facing the central shaft (1) is clearance-matched with the outer peripheral wall of the central shaft (1).

3. The cyclone with adjustable blade angle according to claim 1, characterized in that: The guide blade (31) faces the outer edge of the cylinder (2) and is in clearance fit with the inner circumferential wall of the cylinder (2).

4. The cyclone with adjustable blade angle according to claim 1, characterized in that: The slide groove (21) passes through the inner peripheral wall and the outer peripheral wall of the cylinder (2).

5. A combustion device, characterized in that: A cyclone with adjustable blade angle comprising the cyclone according to any one of claims 1 to 4.

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