A flow guide structure for air intake of heavy-duty gas turbine

Abstract

The present invention belongs to the technical field of gas turbines, and discloses a guide structure for air intake of a heavy-duty gas turbine, which includes a shell, and an air inlet and an air outlet perpendicular to each other are provided on the shell, and the air outlet is connected to an outer guide portion extending to the outside of the shell, which is used to cooperate with the air intake end of the heavy-duty gas turbine, and the outer guide portion is truncated cone-shaped and its large end is connected to the air outlet; an inner guide portion extending in the direction of the air outlet is provided on the inner wall of the shell opposite to the air outlet, and the inner guide portion is truncated cone-shaped and its large end is connected to the inner wall of the shell; a guide plate is provided on the inner wall of the shell, so that the gas entering from the air inlet passes through the guide plate and the inner guide portion and then flows out uniformly and smoothly through the air outlet and the outer guide portion in turn. The present invention combines the air intake turning and the guide into one through a guide structure with a special structure, and the structure is compact, and the function can be realized in a small space, and the airflow passing through the guide structure can flow into the gas turbine uniformly and smoothly, thereby improving the efficiency of the gas turbine.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas turbines, and more specifically, relates to a flow guide structure for air intake of a heavy-duty gas turbine. Background Art

[0002] Under the premise of the country advocating energy conservation, environmental protection and sustainable development, the development of gas power plants is growing day by day, and the total installed capacity of gas turbines in the world is also expanding, which has also led to the rise of gas turbine auxiliary systems. As one of the most important auxiliary machines, the gas turbine air intake filtration system is the only line of defense for the outside air to enter the gas turbine. Its main function is to provide the gas turbine with clean air that meets the requirements through filtration, dehumidification and other measures, thereby ensuring the normal operation of the gas turbine.

[0003] Due to the air intake requirements of heavy-duty gas turbines, the air intake filtration system is generally designed at a high place, while the gas turbine is generally set near the ground. There is a height difference between the two, and the gas turbine air intake (2) is generally arranged horizontally, so the air intake filtration system must be provided with a flow channel from the vertical direction to the horizontal direction. At the same time, the air intake requirements of heavy-duty gas turbines make the air intake structure size much larger than the gas turbine impeller, which causes the intake airflow to have a reduced flow channel before entering the gas turbine. If there is no suitable structure or equipment to guide the airflow entering the gas turbine, the turbulent airflow is bound to affect the efficiency of the gas turbine. In addition, due to the existence of gas turbines and power generation equipment, the space size of the flow channel is greatly limited, and many common solutions are difficult to work.

[0004] When the airflow changes from vertical to horizontal, the airflow hits the wall, which can easily cause airflow turbulence, airflow disturbance, and energy loss. For 90° turns, ordinary flow channels generally use arc turns similar to 90° elbows in pipes to reduce airflow disturbances. However, the flow channel in this way needs to be set with a certain turning radius, which limits its use in heavy-duty gas turbines due to the narrow space. In addition, due to space limitations, the flow channel entering the gas turbine shrinks directly, and the flow channel angle will be very small and the change will be very drastic. The gas turbine's own impeller blades and its external casing need to be matched with a suitable intake angle to ensure the efficiency of the gas turbine. Summary of the invention

[0005] In view of the defects of the prior art, the purpose of the present invention is to provide a guide structure for the intake of a heavy-duty gas turbine, aiming to solve the problem of how to make the airflow of the heavy-duty gas turbine pass through the narrow intake flow channel and enter the gas turbine evenly and smoothly.

[0006] To achieve the above-mentioned purpose, the present invention provides a guide structure for air intake of a heavy-duty gas turbine, comprising an outer shell, an air inlet is provided on the top of the outer shell, an air outlet perpendicular to the direction of the air inlet is provided on the side wall of the outer shell, the air outlet is connected to an outer guide portion extending toward the outside of the outer shell for cooperating with the air intake end of the heavy-duty gas turbine, the outer guide portion is truncated cone-shaped and its large end is connected to the air outlet; an inner guide portion extending toward the direction of the air outlet is provided on the inner wall of the outer shell opposite to the air outlet, the inner guide portion is truncated cone-shaped and its large end is connected to the inner wall of the outer shell; a guide plate is provided on the inner wall of the outer shell, so that the gas entering from the air inlet passes through the guide plate and the inner guide portion and then flows out uniformly and smoothly through the air outlet and the outer guide portion in turn.

[0007] Preferably, the guide plate is composed of a first curved panel, a second curved panel and a third curved panel, all of which are crescent-shaped, the long arc side of the second curved panel is connected to the short arc side of the first curved panel, the short arc side of the second curved panel is connected to the long arc side of the third curved panel, and the long arc side of the first curved panel and the short arc side of the third curved panel are both connected to the inner wall of the outer shell.

[0008] Further preferably, the short arc side of the third curved plate is in an arc shape and coincides with the edge of the air outlet.

[0009] Preferably, the outer flow guide portion and the inner flow guide portion are coaxially arranged.

[0010] Preferably, the small end of the inner guide portion extends out of the air outlet.

[0011] Preferably, a through hole is provided on the outer shell, and the through hole is detachably sealedly connected to the large end of the inner guide portion.

[0012] Preferably, the bottom surface of the shell is a curved surface.

[0013] Preferably, a plurality of supporting parts are arranged inside the shell for supporting the inner wall of the shell.

[0014] Preferably, a drainage hole is provided at the bottom of the housing.

[0015] Preferably, the housing is provided with an openable and closable maintenance window.

[0016] In general, the above technical scheme conceived by the present invention has the following beneficial effects compared with the prior art: the present invention adds a guide component in the shell flow channel of the intake turning, combines the intake turning and the guide structure into one, and makes the structure compact, so that the device can complete the turning and guiding of the airflow in a small space at the same time, ensure that the airflow enters the gas turbine evenly and smoothly in the appropriate direction, and provide an intake airflow at a suitable angle within the limited space under the premise of satisfying the contraction of the flow channel, thereby reducing the pressure loss caused by gas disturbance and improving the efficiency of the gas turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural diagram of a heavy-duty gas turbine intake air guide structure from one perspective according to an embodiment of the present invention;

[0018] Figure 2 A structural schematic diagram of the air intake guide structure for a heavy-duty gas turbine according to an embodiment of the present invention from another perspective;

[0019] Figure 3 This is a front view of a guide structure for air intake of a heavy-duty gas turbine according to an embodiment of the present invention;

[0020] Figure 4 A cross-sectional view of a guide structure for air intake of a heavy-duty gas turbine according to an embodiment of the present invention;

[0021] Figure 5 A top view of a guide structure for an air intake of a heavy-duty gas turbine according to an embodiment of the present invention;

[0022] Figure 6 This is a schematic structural diagram of a guide plate according to an embodiment of the present invention;

[0023] Throughout the drawings, the same reference numerals are used to denote the same elements or structures, wherein:

[0024] 1-housing; 2-air inlet; 3-air outlet; 4-external guide part; 5-internal guide part; 6-guide plate, 61-first curved plate, 62-second curved plate, 63-third curved plate; 7-support part; 8-drainage hole; 9-maintenance window. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0026] like Figures 1 to 5As shown, a guide structure for air intake of a heavy-duty gas turbine provided by the present invention comprises: an outer shell 1, an outer guide part 4, an inner guide part 5 and a guide plate 6. An air inlet 2 and an air outlet 3 are provided on the outer shell 1, and the air inlet 2 and the air outlet 3 are perpendicular to each other. The airflow entering from the air inlet 2 flows out from the air outlet 3 after being turned 90 degrees in the guide structure. The outer guide part 4 is connected to the air outlet 3 and is located outside the outer shell 1. The inner guide part 5 and the guide plate 6 are located inside the outer shell 1 and connected to the inner wall of the outer shell 1. The gas entering the guide structure outer shell 1 from the air inlet 2 passes through the guide plate 6 and the inner guide part 5, and then flows out uniformly and smoothly through the air outlet 3 and the outer guide part 4 in sequence.

[0027] The above technical solution is described in detail below in conjunction with specific embodiments.

[0028] See also Figure 4 The air inlet 2 is arranged at the top of the housing 1, and the airflow enters the interior of the guide structure from there; the air outlet 3 is arranged on the side wall of the housing 1, and is perpendicular to the direction of the air inlet 2. Figure 3 In this embodiment, the shape of the housing 1 is a rectangular parallelepiped with the bottom surface transformed into an arc surface. The arc-shaped structure of the bottom is conducive to guiding the flow, so that the airflow flows out to the air outlet 3 more evenly. The rectangular cross-section of the upper part of the housing 1 is longer and narrower. The longer length is to meet the intake flow requirements of the heavy-duty gas turbine, and the narrower width is due to the limitation of the gas turbine structure.

[0029] See also Figure 2 and Figure 6 The guide plate 6 is arranged on the inner wall of the shell 1, and can be composed of three parts, namely, the first curved plate 61, the second curved plate 62 and the third curved plate 63, which are all crescent-shaped. The long arc side of the second curved plate 62 is welded to the short arc side of the first curved plate 61, and the short arc side of the second curved plate 62 is welded to the long arc side of the third curved plate 63. The long arc side of the first curved plate 61 and the short arc side of the third curved plate 63 are both welded to the inner wall of the shell 1, that is, the guide plate 6 and the inner wall of the shell 1 form an internal hollow structure, and the guide plate 6 is welded to the inner wall of the shell 1. The first curved plate 61 and the third curved plate 63 are curved surface structures made by cutting off the part after the cone is extracted, and the curved surface structure of the second curved plate 62 is formed by pressing. Preferably, the guide plate 6 is close to the air outlet 3 and arranged above it, and the short arc side of the third curved plate 63 is arc-shaped and coincides with the edge of the air outlet 3. Through simulation tests, it is found that the special surface shape of the guide plate 6 can better guide the airflow to turn, so that when the airflow flows through the structure, the kinetic energy loss of the airflow can be reduced as much as possible, and the airflow has a more uniform flow field at the air outlet 3; at the same time, the structure also increases the turning radius of the airflow, making the airflow turn smoother and more uniform.

[0030] See also Figure 1 , Figure 4 and Figure 5The inner guide part 5 is truncated cone-shaped, arranged on the inner wall of the shell 1 opposite to the air outlet 3 and extending in the direction of the air outlet 3, its large end is connected to the inner wall of the shell 1, and the small end is preferably extended out of the air outlet 3, that is, the height of the inner guide part 5 is greater than the width of the cross section of the shell 1, and the airflow inside the guide structure can be more smoothly guided out of the air outlet 3. The inner guide part 5 guides the air through its outer curved surface and is the main guide component of the guide structure. The inner guide part 5 can be either a hollow structure or a solid structure. In order to save processing materials and make the guide structure lighter, a hollow structure is preferably used. As long as the airflow in the guide structure does not enter the interior of the inner guide part 5, the inner guide part 5 can be closed at both ends; or only the small end can be closed, and the large end can be detachably sealed and connected to the through hole opened on the shell 1. Specifically, there is a flange on the large end side, which is bolted to the flange at the through hole on the shell 1, and a sealing structure is provided at the flange connection to ensure that the airflow does not leak from here. Such a detachable structure is convenient for entering the interior of the guide structure from here for cleaning when necessary. The functions of the inner guide portion 5 are: first, to guide the airflow to be completely diverted, and to guide the vertical air intake to the horizontal air outlet; second, by cooperating with the arc structure at the bottom of the outer shell 1 and the air outlet 3, the outlet flow channel is initially contracted. This contraction makes full use of the original flow channel space without occupying additional external space, and can operate smoothly in a small space.

[0031] See also Figure 1 , Figure 4 and Figure 5 The outer guide part 4 can be a truncated cone shaped by pressing a steel plate, with both ends open, the large end connected to the air outlet 3, and the small end extending to the outside of the outer shell 1. The diameter of the large end of the outer guide part 4 is the same as the diameter of the air outlet, and the specific size needs to be calculated according to the air intake angle of the gas turbine. The height of the outer guide part 4 is lower than that of the inner guide part 5. It serves as a guide channel at the outlet of the guide structure to provide the final guidance for the airflow. At the same time, the inclination angle of the curved surface of the outer guide part 4 is adapted to the appropriate angle of the gas turbine intake, ensuring that the airflow enters the gas turbine at the angle most suitable for the gas turbine during intake. Preferably, refer to Figure 3 The outer guide part 4 and the inner guide part 5 are coaxially arranged, which is more conducive to flow guidance.

[0032] See also Figure 1 or Figure 2 In practical applications, since the shell 1 of the flow guide structure is relatively large, in order to prevent the shell 1 from deforming, it is preferable to set multiple support parts 7 inside the shell 1 to support the inner wall of the shell 1. Specifically, the support part 7 can be a steel pipe, and multiple steel pipes are arranged in parallel between the two side walls of the shell 1.

[0033] See also Figure 1 Since the change of flow channel pressure in the flow guide structure may cause condensation of the liquid, a smaller drainage hole 8 is provided at the bottom of the housing 1 to discharge the liquid inside the flow guide structure.

[0034] As a preferred embodiment, Figure 2 As shown, an openable and closable maintenance window 9 can be provided on the housing 1 to facilitate maintenance of the interior of the flow guide structure. The maintenance window 9 should be closed when the flow guide structure is working.

[0035] The present invention provides a flow guide structure for a heavy-duty gas turbine with a simple structure and easy processing and installation by using the above technical solution. By adding a flow guide component in the housing flow channel of the intake turning, the intake turning and the flow guide structure are combined into one, so that the structure is compact, so that the device can simultaneously realize the turning and guiding of the airflow in a small space, ensuring that the airflow enters the gas turbine evenly and smoothly in the appropriate direction, and providing an intake airflow at a suitable angle within the limited space under the premise of satisfying the contraction of the flow channel, reducing the pressure loss caused by gas disturbance, and thus improving the efficiency of the gas turbine.

[0036] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A guide structure for air intake of a heavy-duty gas turbine, Features: The invention comprises a shell (1), wherein an air inlet (2) is provided on the top of the shell (1), and an air outlet (3) perpendicular to the air inlet (2) is provided on the side wall of the shell (1); the air outlet (3) is connected to an outer guide portion (4) extending toward the outside of the shell (1) for matching with the air inlet end of a heavy-duty gas turbine; the outer guide portion (4) is truncated cone-shaped and its large end is connected to the air outlet (3); an inner guide portion (5) extending toward the air outlet (3) is provided on the inner wall of the shell (1) opposite to the air outlet (3); the inner guide portion (5) is truncated cone-shaped and its large end is connected to the inner wall of the shell (1); a guide plate (6) is provided on the inner wall of the shell (1) so that the gas entering from the air inlet (2) passes through the guide plate (6) and the inner guide portion (5) and then passes through the air outlet (3) and the outer guide portion (4) in sequence to flow out evenly and smoothly; The guide plate (6) is composed of a first curved plate (61), a second curved plate (62), and a third curved plate (63), all of which are crescent-shaped; the long arc side of the second curved plate (62) is connected to the short arc side of the first curved plate (61); the short arc side of the second curved plate (62) is connected to the long arc side of the third curved plate (63); and the long arc side of the first curved plate (61) and the short arc side of the third curved plate (63) are both connected to the inner wall of the outer shell (1).

2. The heavy-duty gas turbine air intake guide structure according to claim 1, Features: The short arc side of the third curved panel (63) is in the shape of a circular arc and coincides with the edge of the air outlet (3).

3. The heavy-duty gas turbine air intake guide structure according to claim 1, Features: The outer flow guide portion (4) and the inner flow guide portion (5) are coaxially arranged.

4. The heavy-duty gas turbine air intake guide structure according to claim 1, Features: The small end of the inner flow guide portion (5) extends out of the air outlet (3).

5. The heavy-duty gas turbine air intake guide structure according to claim 1, Features: The outer shell (1) is provided with a through hole, and the through hole is detachably sealedly connected to the large end of the inner flow guide portion (5).

6. The heavy-duty gas turbine air intake guide structure according to claim 1, Features: The bottom surface of the housing (1) is a curved surface.

7. The heavy-duty gas turbine air intake guide structure according to claim 1, Features: A plurality of support parts (7) are arranged inside the shell (1) and are used to support the inner wall of the shell (1).

8. The heavy-duty gas turbine air intake guide structure according to claim 1, Features: The bottom of the housing (1) is provided with a drainage hole (8).

9. The heavy-duty gas turbine air intake guide structure according to any one of claims 1 to 8, Features: The housing (1) is provided with an openable and closable maintenance window (9).

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