Diffuser of a gas turbine

Abstract

The present application discloses a diffuser of a gas turbine, which relates to the field of diffusers. The diffuser comprises a first flange and a second flange, wherein a pipe body is fixedly installed between the first flange and the second flange, a support ring is fixedly installed in the middle section of the pipe body, a quick air diffusion mechanism is arranged inside the pipe body, and the quick air diffusion mechanism comprises a motor fixedly installed on the outer wall of the support ring, a transmission shaft is rotatably arranged on the inner ring of the support ring, the output end of the motor is transmission-connected with the transmission shaft, a support frame is fixedly arranged on the inner ring of the support ring, a long axis is rotationally arranged at the center of the support frame, a first fan blade is fixedly arranged at one end of the long axis close to the first flange, a second fan blade is fixedly arranged at one end of the long axis close to the second flange, and the long axis is transmission-connected with the transmission shaft. The present application can accelerate the flow rate of high-temperature flue gas in the pipe body through the quick air diffusion mechanism, thereby reducing the adverse effects of thermal expansion on the diffuser.

Description

Technical Field

[0001] The present application relates to the field of diffusers, and in particular to a diffuser of a gas turbine. Background Art

[0002] At present, gas turbines are a kind of efficient and reliable rotating impeller heat engine. Their main purpose is to convert the chemical energy of fuel into mechanical energy. They are widely used in aviation, power generation, industry and other fields. In the main process of air and gas in gas turbines, there is only a gas turbine cycle consisting of three major components: compressor, combustion chamber and gas turbine. It is generally called a simple cycle. Most gas turbines adopt a simple cycle scheme. The gas turbine exhaust diffuser is located at the end of the gas turbine and is connected to the exhaust pipe by bolts. The gas that has done work in the gas turbine first enters the exhaust pipe, then enters the exhaust diffuser, and finally enters the waste heat recovery boiler.

[0003] The main body of the diffuser of the gas turbine in the prior art is a truncated cone-shaped pipe with different diameters at both ends of the pipe, wherein the end with a smaller diameter is connected to the gas turbine, and the end with a larger diameter is connected to the waste heat boiler. Since the temperature of the exhaust gas from the gas turbine is relatively high, after it enters the diffuser, it will cause thermal expansion at the connection between the diffuser and the gas turbine and the waste heat boiler. The diffuser is easily affected by the thermal expansion for a long time, which may cause structural deformation or even damage. Therefore, a diffuser that can reduce the influence of thermal expansion is needed to extend the service life of the diffuser. Utility Model Content

[0004] In order to reduce the adverse effects of thermal expansion on the diffuser, the present application provides a diffuser for a gas turbine.

[0005] The diffuser of a gas turbine provided in the present application adopts the following technical solution:

[0006] A diffuser of a gas turbine comprises a first flange and a second flange, wherein a tube body is fixedly mounted between the first flange and the second flange, a support ring is fixedly mounted on the middle section of the tube body, a quick air dispersion mechanism is arranged inside the tube body, the quick air dispersion mechanism comprises a motor fixedly mounted on the outer wall of the support ring, a transmission shaft is rotatably arranged on the inner ring of the support ring, an output end of the motor is transmission-connected to the transmission shaft, a support frame is fixedly mounted on the inner ring of the support ring, a long shaft is rotationally arranged at the center of the support frame, a first fan blade is fixedly mounted on one end of the long shaft close to the first flange, a second fan blade is fixedly mounted on one end of the long shaft close to the second flange, and the long shaft is transmission-connected to the transmission shaft.

[0007] By adopting the above technical solution, the rapid air diffusion mechanism can speed up the flow rate of high-temperature flue gas in the pipe body, thereby reducing the adverse effects of thermal expansion on the diffuser.

[0008] Preferably, a bellows is fixedly disposed on one end of the first flange and the other end of the second flange, and the tube body is fixedly disposed between the two bellows.

[0009] By adopting the above technical solution, when high-temperature flue gas passes through the tube body, thermal expansion occurs at both ends of the tube body, causing the position of the tube body to shift, and the bellows at both ends of the tube body expand and contract, thereby compensating for the distance moved by the tube body.

[0010] Preferably, a first bevel gear is fixedly provided at one end of the transmission shaft close to the center of the support ring, and a second bevel gear is fixedly provided on the outer wall of the long shaft at a position close to the support frame, and the second bevel gear is meshingly connected with the first bevel gear.

[0011] By adopting the above technical solution, after the motor is started, it can drive the long shaft to rotate through the transmission shaft, thereby driving the first fan blade and the second fan blade to work.

[0012] Preferably, the pipe body comprises an outer plate fixedly arranged between the first flange and the second flange, one end of the outer plate is fixedly connected to the bellows, and the other end of the outer plate is fixedly connected to the support ring.

[0013] By adopting the above technical solution, the outer plate can protect the diffuser and prevent the internal structure of the diffuser from being damaged.

[0014] Preferably, an inner lining plate is fixedly arranged between the first flange and the second flange, the inner lining plate is arranged parallel to the outer plate, and an insulation plate is laid between the inner lining plate and the outer plate.

[0015] By adopting the above technical solution, the insulation board plays a role of heat preservation and insulation, preventing the smoke from losing a large amount of heat energy when passing through the pipe body.

[0016] Preferably, a displacement monitoring mechanism is installed at the bottom of the support ring, and the displacement monitoring mechanism includes a support column fixedly installed on the outer wall of the support ring, and pulleys are rotatably provided on both sides of the bottom of the support column.

[0017] By adopting the above technical solution, the displacement monitoring mechanism can support the pipe body, and at the same time, the displacement monitoring mechanism can also monitor the displacement of the pipe body caused by thermal expansion.

[0018] Preferably, a slide rail is further provided at the bottom of the support column, the pulley is clamped in the slide rail, and two pressure sensors are fixedly installed on the top of the slide rail, and the two pressure sensors are respectively arranged on both sides of the support column.

[0019] By adopting the above technical solution, the pressure sensor can convert the pressure it is subjected to into electric charge or voltage for measurement. When the pressure value measured by the pressure sensor exceeds the limit value, the warning light above the pressure sensor lights up.

[0020] Preferably, a limit rod is fixedly provided on one side of the pressure sensor close to the support column, a slide rod is slidably provided inside the limit rod, and one end of the slide rod away from the limit rod is fixedly provided on the side wall of the support column.

[0021] By adopting the above technical solution, the closer the sliding rod is to the pressure sensor, the greater the pressure measured by the pressure sensor. When the warning light above the pressure sensor lights up, it means that the distance moved by the pipe body due to thermal expansion is too large.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. The rapid gas diffusion mechanism can speed up the flow rate of smoke in the pipeline, so that the smoke can quickly move from the first flange to the second flange, reduce the retention time of high-temperature smoke in the pipe body, reduce the degree of thermal expansion, thereby extending the service life of the diffuser and improving the efficiency of the diffuser in conveying smoke.

[0024] 2. With the help of the displacement monitoring mechanism, the displacement of the pipe body caused by thermal expansion can be monitored. When the warning light above the pressure sensor lights up, it means that the distance moved by the pipe body during thermal expansion is too large, and the structure of the pipe body or bellows may be damaged, thereby achieving safety warning and preventing smoke leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall structure of the diffuser of the gas turbine of this application;

[0026] Figure 2 A schematic diagram of the internal structure of a pipe body of a diffuser of a gas turbine of the present application;

[0027] Figure 3 A schematic diagram of the structure of a displacement monitoring mechanism for a diffuser of a gas turbine of the present application;

[0028] Figure 4 A schematic diagram of the structure of a rapid air dispersion mechanism of a diffuser of a gas turbine of the present application;

[0029] Figure 5 For this application Figure 4 An enlarged schematic diagram of part A.

[0030] Reference numerals:

[0031] 1. First flange; 2. Second flange; 3. Bellows;

[0032] 4. pipe body; 41. outer plate; 42. insulation plate; 43. lining plate;

[0033] 5. Support ring;

[0034] 6. Rapid air dispersion mechanism; 61. Motor; 62. Transmission shaft; 63. First bevel gear; 64. Second bevel gear; 65. Support frame; 66. Long shaft; 67. First fan blade; 68. Second fan blade;

[0035] 7. Displacement monitoring mechanism; 71. Slide rail; 72. Support column; 73. Pulley; 74. Slide rod; 75. Limit rod; 76. Pressure sensor. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-5 This application is described in further detail.

[0037] An embodiment of the present application discloses a diffuser for a gas turbine.

[0038] Example 1

[0039] Reference Figure 1 and Figure 2 A diffuser of a gas turbine includes a first flange 1 and a second flange 2. The first flange 1 and the second flange 2 are concentrically matched, and the diameter of the first flange 1 is smaller than the diameter of the second flange 2. A bellows 3 is fixedly arranged on the end surface of the first flange 1, and the outer diameter of the bellows 3 is slightly smaller than the outer diameter of the first flange 1. A bellows 3 is also fixedly arranged on the end surface of the second flange 2, and the outer diameter of the bellows 3 is slightly smaller than the outer diameter of the second flange 2. The two bellows 3 are located between the first flange 1 and the second flange 2. The two bellows 3 can be expanded and contracted along the axial direction of the first flange 1 and the second flange 2, so as to compensate for the displacement caused by thermal expansion. A pipe body 4 is fixedly installed between the two bellows 3. The pipe body 4 is in a truncated cone shape, and the middle part thereof is through-shaped. A support ring 5 is fixedly installed in the middle section of the pipe body 4. The support ring 5 divides the pipe body 4 into two, and the connection between the support ring 5 and the pipe body 4 is fixedly connected by welding. A quick gas diffusion mechanism 6 is arranged inside the pipe body 4, and the quick gas diffusion mechanism 6 is used to accelerate the flow rate of flue gas in the pipe body 4.

[0040] In the above arrangement, when installing the diffuser, the first flange 1 is fixed to the end of the gas turbine, and the second flange 2 is fixed to the air inlet end of the waste heat boiler. The high-temperature flue gas that has completed the work in the gas turbine enters the waste heat boiler through the pipe body 4, and the high-temperature flue gas will produce thermal expansion when passing through the pipe body 4. The bellows 3 at both ends of the pipe body 4 can compensate for the displacement of the pipe body 4 caused by thermal expansion.

[0041] refer to Figure 2 and Figure 4As shown, the rapid gas dispersion mechanism 6 includes a motor 61 fixedly mounted on the outer wall of the support ring 5, the output end of the motor 61 faces the inside of the tube body 4, and a transmission shaft 62 is rotatably arranged on the support ring 5 at a position close to the motor 61. The transmission shaft 62 is arranged along the radial direction of the support ring 5. After the motor 61 is started, it can drive the transmission shaft 62 to rotate. A first bevel gear 63 is fixedly arranged at one end of the transmission shaft 62 away from the motor 61. A support frame 65 is arranged in the support ring 5. The support frame 65 is composed of a plurality of ribs and a cylinder in the center of the ribs. The ribs of the support frame 65 are arranged along the radial distribution of the support ring 5. The cloth and its end are fixed on the inner ring of the support ring 5. A long shaft 66 is rotatably arranged in the cylinder at the center of the support frame 65. The axial direction of the long shaft 66 is flush with the axial direction of the tube body 4. The first fan blade 67 and the second fan blade 68 are fixedly arranged at both ends of the long shaft 66. When the first fan blade 67 and the second fan blade 68 are working, they can drive the airflow to move from the position of the first flange 1 to the second flange 2. A second bevel gear 64 is keyed and fixed on the outer wall of the long shaft 66. The end face of the second bevel gear 64 is close to the support frame 65, and when the first bevel gear 63 rotates, it can drive the second bevel gear 64 to rotate.

[0042] The above arrangement drives the transmission shaft 62 to rotate by starting the motor 61, and the transmission shaft 62 drives the long shaft 66 to rotate through the first bevel gear 63 and the second bevel gear 64. After the long shaft 66 rotates, it drives the first blade 67 and the second blade 68 to work, thereby accelerating the flow rate of the flue gas in the pipeline, so that the flue gas quickly moves from the position of the first flange 1 to the second flange 2, reducing the residence time of the high-temperature flue gas in the pipe body 4, reducing the degree of thermal expansion, and thus reducing the damage of thermal expansion to the diffuser.

[0043] refer to Figure 5 As shown, the pipe body 4 includes an outer plate 41 fixedly arranged between the two bellows 3, the outer plate 41 is a trumpet-shaped annular metal plate, and the outer plate 41 is divided into two parts, one part is located between the first flange 1 and the support ring 5, and the other part is located between the support ring 5 and the second flange 2. An inner lining plate 43 is also fixedly arranged between the first flange 1 and the second flange 2. The inner lining plate 43 is arranged parallel to the outer plate 41. The fixing installation method of the inner lining plate 43 is the same as that of the outer plate 41, and a certain gap is left between the inner lining plate 43 and the outer plate 41. An insulation plate 42 is laid in the gap between the inner lining plate 43 and the outer plate 41, and the insulation plate 42 is made of insulation material.

[0044] With the above arrangement, the high-temperature flue gas directly contacts the inner lining plate 43 when passing through the pipe body 4, and the heat-insulating plate 42 can insulate the inner lining plate 43 from the outer plate 41, thereby reducing the loss of heat energy of the flue gas.

[0045] The implementation principle of the diffuser of a gas turbine in an embodiment of the present application is as follows: when installing the diffuser, the first flange 1 is fixed to the end of the gas turbine, and the second flange 2 is fixed to the air inlet end of the waste heat boiler. When the gas turbine is working, the flue gas that has completed the work in the gas turbine enters the waste heat boiler through the diffuser. At this time, the rapid gas dispersion mechanism 6 is started, the motor 61 is turned on and drives the long shaft 66 to rotate through the transmission structure, and the long shaft 66 drives the first blade 67 and the second blade 68 to work, thereby accelerating the flow rate of the flue gas in the pipeline, so that the flue gas quickly moves from the position of the first flange 1 to the second flange 2, reducing the time that the high-temperature flue gas stays in the pipe body 4, reducing the degree of thermal expansion, thereby reducing the damage to the diffuser caused by thermal expansion and extending the service life of the diffuser.

[0046] Example 2

[0047] Reference Figure 1 and Figure 3 The difference between this embodiment and embodiment 1 is that a displacement monitoring mechanism 7 is installed at the bottom of the support ring 5, and the displacement monitoring mechanism 7 is used to monitor the displacement caused by the thermal expansion of the pipe body 4. The displacement monitoring mechanism 7 includes a support column 72 fixedly installed on the outer wall of the support ring 5, and the support column 72 is located below the pipe body 4 and is arranged along the vertical direction. A pulley 73 and a slide rail 71 are arranged at the bottom of the support column 72. The length direction of the slide rail 71 is flush with the axial direction of the pipe body 4, and the slide rail 71 is fixedly installed on the horizontal ground. The pulley 73 is provided in two and is rotatably arranged on the two side walls of the support column 72 respectively. The pulley 73 is clamped in the slide rail 71, and the pulley 73 can move back and forth along the length direction of the slide rail 71.

[0048] The above arrangement can support the tube body 4 through the support column 72, the pulley 73 and the slide rail 71, limit the position of the tube body 4, and make the tube body 4 unable to float up and down, but can only move linearly along the slide rail 71. When thermal expansion occurs, the bellows 3 at both ends of the tube body 4 expand and contract, thereby driving the tube body 4 to move back and forth along the slide rail 71.

[0049] refer to Figure 3 Two pressure sensors 76 are mirror-imaged on both sides of the support column 72. Both pressure sensors 76 are fixed on the top of the slide rail 71. The pressure sensor 76 uses a PZT piezoelectric sensor, which can convert the pressure into an electric charge or voltage for measurement. A limit rod 75 is fixedly provided on the side where the two pressure sensors 76 are close to each other. The axis of the limit rod 75 is flush with the horizontal direction. A slide rod 74 is slidably provided at one end of the two limit rods 75 close to each other. The slide rod 74 can move back and forth in the limit rod 75. The end of the slide rod 74 located outside the limit rod 75 is fixedly connected to the side wall of the support column 72. A spring is press-fitted in the limit rod 75, and the spring can transfer the pressure provided by the slide rod 74 to the pressure sensor 76.

[0050] With the above arrangement, when the tube body 4 moves back and forth along the slide rail 71, it drives the support column 72 to move, and the support column 72 drives the slide bar 74 to move in the limit rod 75. When the slide bar 74 is closer to the pressure sensor 76, the greater the pressure measured by the pressure sensor 76. When the pressure value measured by the pressure sensor 76 exceeds the limit value, the warning light above the pressure sensor 76 lights up (the pressure sensor 76 and the warning light are prior art, and their specific principles are not explained in detail).

[0051] The implementation principle of Example 2 is as follows: during installation, the slide rail 71 is fixedly installed on the horizontal ground, and the pulley 73 is clamped in the slide rail 71. The support column 72, the pulley 73 and the slide rail 71 can support and limit the pipe body 4, so that the pipe body 4 cannot float up and down. During thermal expansion, the bellows 3 at both ends of the pipe body 4 are extended and retracted, thereby driving the pipe body 4 to move back and forth along the slide rail 71. When the pipe body 4 moves, it will drive the support column 72 and the slide rod 74 to move. When the slide rod 74 is closer to the pressure sensor 76, the greater the pressure measured by the pressure sensor 76. When the pressure value measured by the pressure sensor 76 exceeds the limit value, the warning light above the pressure sensor 76 lights up, indicating that the distance moved by the pipe body 4 during thermal expansion is too large, and the pipe body 4 or the bellows 3 may be damaged. It should be repaired in time to prevent smoke leakage.

[0052] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A diffuser for a gas turbine, characterized in that: It comprises a first flange (1) and a second flange (2); a pipe body (4) is fixedly installed between the first flange (1) and the second flange (2); a support ring (5) is fixedly installed in the middle section of the pipe body (4); and a quick gas dispersion mechanism (6) is arranged inside the pipe body (4); The rapid air dispersion mechanism (6) comprises a motor (61) fixedly mounted on the outer wall of the support ring (5); a transmission shaft (62) is rotatably arranged on the inner ring of the support ring (5); an output end of the motor (61) is transmission-connected to the transmission shaft (62); a support frame (65) is fixedly arranged on the inner ring of the support ring (5); a long shaft (66) is rotationally arranged at the center of the support frame (65); a first fan blade (67) is fixedly arranged at one end of the long shaft (66) close to the first flange (1); a second fan blade (68) is fixedly arranged at one end of the long shaft (66) close to the second flange (2); and the long shaft (66) is transmission-connected to the transmission shaft (62).

2. A gas turbine diffuser according to claim 1, characterized in that: A bellows (3) is fixedly arranged at one end of the first flange (1) and the other end of the second flange (2), and the tube body (4) is fixedly arranged between the two bellows (3).

3. A gas turbine diffuser according to claim 1, characterized in that: A first bevel gear (63) is fixedly arranged at one end of the transmission shaft (62) close to the center of the support ring (5), and a second bevel gear (64) is fixedly arranged on the outer wall of the long shaft (66) at a position close to the support frame (65), and the second bevel gear (64) is meshingly connected with the first bevel gear (63).

4. A gas turbine diffuser according to claim 1, characterized in that: The pipe body (4) comprises an outer plate (41) fixedly arranged between the first flange (1) and the second flange (2), one end of the outer plate (41) being fixedly connected to the bellows (3), and the other end of the outer plate (41) being fixedly connected to the support ring (5).

5. The gas turbine diffuser according to claim 1, characterized in that: An inner lining plate (43) is also fixedly arranged between the first flange (1) and the second flange (2); the inner lining plate (43) is arranged parallel to the outer plate (41); and an insulation plate (42) is laid between the inner lining plate (43) and the outer plate (41).

6. A gas turbine diffuser according to claim 1, characterized in that: A displacement monitoring mechanism (7) is installed at the bottom of the support ring (5), and the displacement monitoring mechanism (7) comprises a support column (72) fixedly installed on the outer wall of the support ring (5), and pulleys (73) are rotatably arranged on both sides of the bottom of the support column (72).

7. A gas turbine diffuser according to claim 6, characterized in that: A slide rail (71) is also provided at the bottom of the support column (72), the pulley (73) is clamped in the slide rail (71), and two pressure sensors (76) are fixedly installed at the top of the slide rail (71), and the two pressure sensors (76) are respectively arranged on both sides of the support column (72).

8. The gas turbine diffuser according to claim 7, characterized in that: A limiting rod (75) is fixedly arranged on one side of the pressure sensor (76) close to the support column (72), a sliding rod (74) is slidably arranged inside the limiting rod (75), and one end of the sliding rod (74) away from the limiting rod (75) is fixedly arranged on the side wall of the support column (72).

Images