A steam turbine low-pressure cylinder exhaust flow field optimization device coupling guide flow and water film jet

Abstract

The utility model discloses a kind of steam turbine low-pressure cylinder exhaust flow field optimization devices of coupling flow guiding and water film jet, including low-pressure exhaust cylinder, condenser neck, low-pressure heater, feed water pump steam turbine exhaust port, four groups of flow guiding device, two groups of water film jet device, low-pressure exhaust cylinder and condenser neck jointly constitute steam turbine low-pressure cylinder exhaust passage, low-pressure heater pipeline, feed water pump steam turbine exhaust port, flow guiding device, water film jet device are arranged in steam turbine low-pressure cylinder exhaust passage, condenser neck upside connects low-pressure exhaust cylinder, condenser neck downside connects condenser shell, flow guiding device is arranged in low-pressure exhaust cylinder middle lower part, low-pressure heater both sides respectively;Water film jet device is mainly arranged in low-pressure exhaust cylinder middle lower part.The beneficial effects of the scheme are that: flow guiding device is installed in low-pressure cylinder exhaust passage, can optimize steam flow, reduce low-speed area area, improve outlet flow field uniformity and condenser total heat exchange coefficient, finally reduce condenser pressure.

Description

Technical Field

[0001] This utility model belongs to the technical field of coal-fired power plants, specifically relating to a steam turbine low-pressure cylinder exhaust flow field optimization device that couples flow guidance and water film jet. Background Technology

[0002] The turbine exhaust passage mainly consists of a low-pressure exhaust cylinder and a condenser throat. On the one hand, it organizes and guides the exhaust steam from the last stage of the turbine into the condenser tube bundle area, ensuring the stability and uniformity of the exhaust steam flow. On the other hand, it makes the best use of the residual kinetic energy of the exhaust steam from the last stage of the turbine to compensate for the exhaust steam loss during the flow process and improve the turbine output.

[0003] However, due to the presence of equipment and pipelines such as the low-pressure heater, feedwater pump, small turbine exhaust port, extraction pipe, and support frame, the internal structure of the exhaust passage is more complex, and the steam flow field is highly turbulent, directly affecting the performance of the condenser and the safety and economy of the unit. Therefore, it is necessary to improve the internal structure of the turbine low-pressure cylinder exhaust passage to improve the flow field. Utility Model Content

[0004] The purpose of this invention is to provide a steam turbine low-pressure cylinder exhaust flow field optimization device that couples flow guidance and water film jet, which can optimize the uniformity of the flow field distribution at the outlet of the steam turbine low-pressure cylinder exhaust channel, enhance the heat transfer coefficient of the condenser heat exchange tube bundle, and thus improve the condenser vacuum.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A turbine low-pressure cylinder exhaust flow field optimization device coupling flow guidance and water film jet includes: a low-pressure exhaust cylinder, a condenser neck, a low-pressure heater, a feedwater pump turbine exhaust port, a first flow guidance device, a second flow guidance device, a third flow guidance device, a fourth flow guidance device, and a water film jet device. The low-pressure exhaust cylinder and the condenser neck together form the turbine low-pressure cylinder exhaust channel. The turbine low-pressure cylinder exhaust channel is equipped with the low-pressure heater, the feedwater pump turbine exhaust port, and the first, second, third, fourth flow guidance devices and the water film jet device. The upper side of the condenser neck is connected to the low-pressure exhaust cylinder, and the lower side is connected to the condenser shell. The first and second flow guidance devices are arranged on both sides of the low-pressure heater. The third and fourth flow guidance devices are arranged in the lower part of the low-pressure exhaust cylinder, on the left and right sides. The water film jet device is arranged in the lower part of the low-pressure exhaust cylinder, on the front and rear sides.

[0006] Furthermore, the first guide device in the low-pressure cylinder exhaust passage includes a large guide plate, which is an arc-shaped guide structure with an arc angle of 28°-32° and a length of 9.50m. The distance between the upper end of the arc-shaped guide structure and the near wall surface is 0.20m-0.40m, and the vertical distance between the lower end and the outlet of the turbine low-pressure cylinder exhaust passage is 1.90m-2.00m.

[0007] Furthermore, the second guide device in the low-pressure cylinder exhaust passage includes a large guide plate, which is an arc-shaped guide structure with an arc angle of 28°-32° and a length of 8.65m. The upper end of the second guide device is 0.20m-0.40m from the near wall surface, and the lower end is 1.90m-2.00m from the vertical distance between it and the outlet of the turbine low-pressure cylinder exhaust passage.

[0008] Furthermore, the third guide device located in the lower part of the low-pressure exhaust cylinder within the low-pressure cylinder exhaust passage includes a small guide plate with an arc-shaped guide structure having an arc angle of 64°-68° and a length of 5.15m. The distance between the upper end of the third guide device and the near-wall surface is 1.60m-1.80m, and the vertical distance between the lower end of the third guide device and the outlet of the turbine low-pressure cylinder exhaust passage is 5.10m-5.60m.

[0009] Furthermore, the fourth flow guiding device located in the lower part of the low-pressure exhaust cylinder within the low-pressure cylinder exhaust passage includes a small flow guiding plate with an arc-shaped flow guiding structure, an arc of 64°-68°, and a length of 5.15m. The upper end of the fourth flow guiding device is 1.60m-1.80m from the near wall surface, and the lower end is 5.10m-5.60m from the vertical distance between it and the outlet of the turbine low-pressure cylinder exhaust passage.

[0010] Furthermore, the jet nozzle body in the water film jet device located in the lower part of the low-pressure exhaust cylinder within the low-pressure cylinder exhaust passage is a circular pipe, with the upper end at a distance of 1.60m-1.80m from the near wall and the lower end at a vertical distance of 5.30m-5.80m from the outlet of the turbine low-pressure cylinder exhaust passage.

[0011] Furthermore, the first flow guiding device consists of a large flow guiding plate with an arc length of 1.05m and a width of 6.80m-7.00m.

[0012] Furthermore, the second flow guiding device consists of a large flow guiding plate with an arc length of 1.05m and a width of 8.80m-9.00m.

[0013] Furthermore, the third flow guiding device has a flow guiding plate with a width of 2.40m and an arc length of 1.03m, and the fourth flow guiding device has a flow guiding plate with a width of 2.40m and an arc length of 1.03m.

[0014] Furthermore, the water film jet device consists of an inlet, a rotating connector, a jet gun body, and a water film nozzle. In the water film jet device, condensate or desalination makeup water is pressurized by a water pump and enters through the inlet. After passing through the jet gun body, it is ejected through the water film nozzle. The entire component can rotate 360° to dynamically adjust the fluid distribution inside the steam turbine.

[0015] Furthermore, the flow guiding device includes a flow guiding plate and a support pipe. One end of the support pipe is fixed to a branch pipe in the low-pressure cylinder exhaust passage, and the flow guiding plate is supported and fixed by the support pipe.

[0016] Furthermore, the material of the flow guiding device must be the same as or higher grade than that of the condenser shell.

[0017] Furthermore, the guide plate and support pipe of the flow guiding device are welded together.

[0018] Furthermore, under the variable operating conditions of the steam turbine, the water film jet device continuously adjusts the injection flow rate of the high-pressure water film jet in real time by controlling the pressure and flow rate of the fluid at the inlet of the water film jet device, and continuously adjusts the angle of the high-pressure water film jet by rotating the water film jet device to ensure that it can be similar to the shape of the guide plate in the scheme, so as to achieve the effect of flow field optimization.

[0019] Furthermore, the calculation and verification method uses flow field calculation simulation software to simulate the flow field at the throat of the existing condenser, obtain the optimization effect, and verify the optimization effect.

[0020] Compared with the prior art, the beneficial effects of this utility model are: A flow guiding device is arranged inside the exhaust passage of the low-pressure cylinder of the steam turbine to guide the high-speed steam flow in the flow field to the low-speed steam flow region, thereby reducing the area of ​​the low-speed region and improving the uniformity of the flow field. This enhances the heat transfer coefficient of the condenser heat exchange tube bundle and thus improves the condenser vacuum. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of one embodiment of the present utility model; Figure 2 for Figure 1 The right view; Figure 3 for Figure 1 The left view; Figure 4 for Figure 1 The main view.

[0022] In the diagram: 1. Low-pressure exhaust cylinder; 2. Condenser neck; 3. Low-pressure heater; 4. Feedwater pump turbine exhaust port; 5. Exit of turbine low-pressure cylinder exhaust passage; 6. First guide device; 7. Second guide device; 8. Third guide device; 9. Fourth guide device; 10. Water film jet device; 11. Turbine low-pressure cylinder exhaust passage. Detailed Implementation

[0023] To make the technical means, creative features, and achieved objectives and effects of this utility model easier to understand, the present utility model is further described below with reference to specific embodiments. However, the following embodiments are only preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this utility model. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods, and the materials and reagents used in the following embodiments are commercially available unless otherwise specified.

[0024] A turbine low-pressure cylinder exhaust flow field optimization device coupling flow guidance and water film jet includes: a low-pressure exhaust cylinder, a condenser neck, a low-pressure heater, a feedwater pump turbine exhaust port, a first flow guidance device, a second flow guidance device, a third flow guidance device, a fourth flow guidance device, and a water film jet device. The low-pressure exhaust cylinder and the condenser neck together form the turbine low-pressure cylinder exhaust channel. The turbine low-pressure cylinder exhaust channel is equipped with the low-pressure heater, the feedwater pump turbine exhaust port, and the first, second, third, fourth flow guidance devices and the water film jet device. The upper side of the condenser neck is connected to the low-pressure exhaust cylinder, and the lower side is connected to the condenser shell. The first and second flow guidance devices are arranged on both sides of the low-pressure heater. The third and fourth flow guidance devices are arranged in the lower part of the low-pressure exhaust cylinder, on the left and right sides. The water film jet device is arranged in the lower part of the low-pressure exhaust cylinder, on the front and rear sides.

[0025] In this embodiment, the first guide device in the low-pressure cylinder exhaust passage includes a large guide plate, which is an arc-shaped guide structure with an arc angle of 28°-32° and a length of 9.50m. The distance between the upper end of the arc-shaped guide structure and the near wall surface is 0.20m-0.40m, and the vertical distance between the lower end and the outlet of the turbine low-pressure cylinder exhaust passage is 1.90m-2.00m.

[0026] In this embodiment, the second guide device in the low-pressure cylinder exhaust passage includes a large guide plate, which is an arc-shaped guide structure with an arc angle of 28°-32° and a length of 8.65m. The upper end of the second guide device is 0.20m-0.40m from the near wall surface, and the lower end is 1.90m-2.00m from the vertical distance between it and the outlet of the turbine low-pressure cylinder exhaust passage.

[0027] In this embodiment, the third guide device located in the lower part of the low-pressure exhaust cylinder within the low-pressure cylinder exhaust passage includes a small guide plate with an arc-shaped guide structure having an arc angle of 64°-68° and a length of 5.15m. The distance between the upper end of the third guide device and the near wall surface is 1.60m-1.80m, and the vertical distance between the lower end of the third guide device and the outlet of the turbine low-pressure cylinder exhaust passage is 5.10m-5.60m.

[0028] In this embodiment, the fourth flow guiding device located in the lower part of the low-pressure exhaust cylinder within the low-pressure cylinder exhaust passage includes a small flow guiding plate with an arc-shaped flow guiding structure and an arc of 64°-68°. The length of the flow guiding plate is 5.15m. The distance between the upper end of the fourth flow guiding device and the near wall surface is 1.60m-1.80m, and the vertical distance between the lower end of the fourth flow guiding device and the outlet of the turbine low-pressure cylinder exhaust passage is 5.10m-5.60m.

[0029] In this embodiment, the jet nozzle body in the water film jet device located in the lower part of the low-pressure exhaust cylinder within the low-pressure cylinder exhaust passage is a circular pipe. The distance between the upper end and the near wall is 1.60m-1.80m, and the vertical distance between the lower end and the outlet of the turbine low-pressure cylinder exhaust passage is 5.30m-5.80m.

[0030] In this embodiment, the first flow guiding device consists of a large flow guiding plate with an arc length of 1.05m and a width of 6.80m-7.00m.

[0031] In this embodiment, the second flow guiding device consists of a large flow guiding plate with an arc length of 1.05m and a width of 8.80m-9.00m.

[0032] In this embodiment, the third flow guiding device has a flow guiding plate with a width of 2.40m and an arc length of 1.03m, and the fourth flow guiding device has a flow guiding plate with a width of 2.40m and an arc length of 1.03m.

[0033] In this embodiment, the water film jet device consists of an inlet, a rotating connector, a jet gun body, and a water film nozzle. Condensate or desalination makeup water is pressurized by a water pump and enters through the inlet. After passing through the jet gun body, it is ejected through the water film nozzle. The entire component can rotate 360° to dynamically adjust the fluid distribution inside the steam turbine.

[0034] In this embodiment, the flow guiding device includes a flow guiding plate and a support pipe. One end of the support pipe is fixed to a branch pipe in the low-pressure cylinder exhaust channel, and the flow guiding plate is supported and fixed by the support pipe.

[0035] In this embodiment, the material of the flow guiding device is required to be the same as that of the condenser shell, or a higher grade material.

[0036] In this embodiment, the guide plate and support pipe of the flow guiding device are welded together.

[0037] In this embodiment, under the variable operating conditions of the steam turbine, the water film jet device continuously adjusts the injection flow rate of the high-pressure water film jet in real time by controlling the pressure and flow rate of the fluid at the inlet of the water film jet device, and continuously adjusts the angle of the high-pressure water film jet by rotating the water film jet device to ensure that it can be similar to the shape of the guide plate in the scheme, so as to achieve the effect of flow field optimization.

[0038] In this embodiment, the calculation and verification method uses flow field calculation simulation software to simulate the flow field at the throat of an existing condenser, obtain the optimization effect, and verify the optimization effect.

[0039] In summary, by utilizing the above-mentioned technical solution of this utility model, by arranging a flow guiding device inside the exhaust passage of the low-pressure cylinder of the steam turbine, the exhaust steam flow of the low-pressure cylinder of the steam turbine and the exhaust steam of the feedwater pump steam turbine are guided through the flow guiding device, thereby reducing the area of ​​the low-speed region and improving the uniformity of the flow field, enhancing the heat transfer coefficient of the condenser heat exchange tube bundle, and thus improving the condenser vacuum.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A device for optimizing the low-pressure cylinder exhaust steam flow field of a steam turbine by coupling flow guidance and water film jet, comprising: The turbine low-pressure exhaust cylinder (1), condenser neck (2), low-pressure heater (3), feedwater pump turbine exhaust port (4), first guide device (6), second guide device (7), third guide device (8), fourth guide device (9), and water film jet device (10) are arranged in the turbine low-pressure cylinder exhaust passage (11) together with the condenser neck (2). The condenser neck is connected to the low-pressure exhaust cylinder (1) on the upper side and the condenser shell on the lower side. The first flow guide device (6) and the second flow guide device (7) are arranged on both sides of the low-pressure heater (3). The third flow guide device (8) and the fourth flow guide device (9) are arranged in the lower part of the low-pressure exhaust cylinder, on the left and right sides. The water film jet device (10) is arranged in the lower part of the low-pressure exhaust cylinder, on the front and rear sides.

2. The turbine low-pressure cylinder exhaust steam flow field optimization device with coupled flow guidance and water film jet according to claim 1, characterized in that, The first guide device (6) in the low-pressure cylinder exhaust passage (11) includes a large guide plate. The guide plate is an arc-shaped structure with an arc angle of 28°-32° and a length of 9.50m. The distance between the upper end of the arc-shaped guide structure and the near wall is 0.20m-0.40m, and the vertical distance between the lower end and the outlet (5) of the low-pressure cylinder exhaust passage of the turbine is 1.90m-2.00m.

3. The turbine low-pressure cylinder exhaust steam flow field optimization device with coupled flow guidance and water film jet according to claim 1, characterized in that, The second guide device (7) in the low-pressure cylinder exhaust passage (11) includes a large guide plate. The guide plate has an arc-shaped structure with an arc angle of 28°-32° and a length of 8.65m. The upper end of the second guide device (7) is 0.20m-0.40m from the near wall, and the lower end is 1.90m-2.00m from the vertical distance between it and the outlet (5) of the low-pressure cylinder exhaust passage of the turbine.

4. The turbine low-pressure cylinder exhaust steam flow field optimization device with coupled flow guidance and water film jet according to claim 1, characterized in that, The third guide device (8) located in the lower part of the low-pressure cylinder exhaust passage (11) includes a small guide plate with an arc-shaped guide structure and an arc of 64°-68°. The guide plate is 5.15m long. The distance between the upper end of the third guide device (8) and the near wall is 1.60m-1.80m, and the vertical distance between the lower end and the outlet (5) of the turbine low-pressure cylinder exhaust passage is 5.10m-5.60m.

5. The turbine low-pressure cylinder exhaust steam flow field optimization device with coupled flow guidance and water film jet according to claim 1, characterized in that, The fourth guide device (9) located in the lower part of the low-pressure exhaust cylinder within the low-pressure cylinder exhaust passage (11) includes a small guide plate with an arc-shaped guide structure and an arc of 64°-68°. The guide plate is 5.15m long. The distance between the upper end of the fourth guide device (9) and the near wall is 1.60m-1.80m, and the vertical distance between the lower end and the outlet (5) of the turbine low-pressure cylinder exhaust passage is 5.10m-5.60m.

6. The turbine low-pressure cylinder exhaust steam flow field optimization device with coupled flow guidance and water film jet according to claim 1, characterized in that, The jet nozzle body in the water film jet device (10) located in the lower part of the low-pressure cylinder exhaust passage (11) is a circular pipe. The distance between the upper end and the near wall is 1.60m-1.80m, and the vertical distance between the lower end and the outlet (5) of the turbine low-pressure cylinder exhaust passage is 5.30m-5.80m.

7. The turbine low-pressure cylinder exhaust steam flow field optimization device with coupled flow guidance and water film jet according to claim 2, characterized in that, The first flow guiding device (6) consists of a large flow guiding plate with an arc length of 1.05m and a width of 6.80m-7.00m.

8. The turbine low-pressure cylinder exhaust steam flow field optimization device with coupled flow guidance and water film jet according to claim 3, characterized in that, The second flow guiding device (7) consists of a large flow guiding plate with an arc length of 1.05m and a width of 8.80m-9.00m.

9. The turbine low-pressure cylinder exhaust steam flow field optimization device according to any one of claims 4-5, characterized in that, The third flow guiding device (8) has a flow guiding plate with a width of 2.40m and an arc length of 1.03m, and the fourth flow guiding device (9) has a flow guiding plate with a width of 2.40m and an arc length of 1.03m.

10. The turbine low-pressure cylinder exhaust steam flow field optimization device with coupled flow guidance and water film jet according to claim 6, characterized in that, The water film jet device (10) consists of an inlet, a rotating connector, a jet gun body, and a water film nozzle. In the water film jet device (10), condensate or desalination water is pressurized by a water pump and enters through the inlet. After passing through the jet gun body, it is ejected through the water film nozzle. The entire component can rotate 360° to dynamically adjust the fluid distribution inside the turbine.

11. The turbine low-pressure cylinder exhaust steam flow field optimization device according to claim 1, characterized in that, The flow guiding device includes a flow guiding plate and a support pipe. One end of the support pipe is fixed to a branch pipe in the low-pressure cylinder exhaust passage (11), and the flow guiding plate is supported and fixed by the support pipe.

12. The turbine low-pressure cylinder exhaust steam flow field optimization device according to claim 1, characterized in that, The material of the flow guiding device must be the same as that of the condenser shell, or a higher grade material.

13. The turbine low-pressure cylinder exhaust steam flow field optimization device according to claim 1, characterized in that, The flow guiding device's flow guide plate and support pipe are welded together.

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