Cooling device for electro-hydraulic regulating system of steam turbine

Abstract

The utility model relates to a kind of cooling device of steam turbine electro-hydraulic regulating system, including oil tank, heat exchange component, cooling water tank, oil tank is communicated with the oil inlet of heat exchange component by oil pipe, oil pump is equipped on oil pipe, the oil outlet of heat exchange component is communicated with oil tank by oil return pipe, cooling water tank is communicated with the water inlet of heat exchange component by water pipe, first water pump is equipped on water pipe, the water outlet of heat exchange component is connected with cooling tower by first backwater pipe, cooling tower is communicated with cooling water tank by second backwater pipe, by the cooperation of equalizing plate and coiled heat exchange pipe in heat exchange component, the heat exchange efficiency of fire-resistant oil and cooling water is greatly improved, the uniform distribution design of oil inlet pot ensures that all fire-resistant oil can be fully cooled, the closed loop water circulation formed by cooling tower and cooling water tank can continuously and stably take away heat, effectively solve the problem of excessively high oil temperature caused by mechanical friction, oil pump temperature rise etc.

Description

Technical Field

[0001] This utility model relates to the field of cooling technology for steam turbine electro-hydraulic conditioning systems, and specifically to a cooling device for a steam turbine electro-hydraulic conditioning system. Background Technology

[0002] The turbine electro-hydraulic control system, commonly referred to as the DEH system or digital electro-hydraulic control system, is the "central control" of the turbine. Essentially, it's an integrated control system combining digital computation, electrical control, and hydraulic actuation. Its core objective is to precisely control the opening of the turbine's inlet valves (high-pressure main steam valve, high-pressure regulating valve, low-pressure main steam valve, etc.) based on grid load demand and turbine operating parameters (speed, steam pressure, power, etc.), thereby regulating the turbine's speed and output power to ensure stable unit operation. The EH oil system, also known as the turbine speed regulating oil system or high-pressure fire-resistant oil system, is a high-pressure hydraulic power and control oil system. Its core function is to provide a high-pressure oil source for the DEH system's "actuators" and convert the DEH's "electrical commands" into "mechanical actions" (valve opening / closing adjustment) through hydraulic components (servo valves, cylinders, etc.).

[0003] Mechanical friction, high oil pump temperature, and oil compression can cause the EH oil temperature to rise. The EH oil temperature should generally be maintained within the range of 30~50℃, and should not exceed 60℃. Excessive oil temperature can cause rapid aging of the seals and other accessories, thermal deformation of mechanical parts, reduced or even deterioration of the EH oil viscosity, and increased leakage, leading to unstable operation of the EH oil system. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a cooling device for a steam turbine electro-hydraulic regulation system.

[0005] The objective of this utility model can be achieved through the following technical solution: A cooling device for a steam turbine electro-hydraulic regulating system includes an oil tank, a heat exchange component, and a cooling water tank. The oil tank is connected to the oil inlet of the heat exchange component via an oil supply pipe. An oil pump is installed on the oil supply pipe. The oil outlet of the heat exchange component is connected to the oil tank via a return oil pipe. The cooling water tank is connected to the water inlet of the heat exchange component via a water supply pipe. A first water pump is installed on the water supply pipe. The water outlet of the heat exchange component is connected to a cooling tower via a first return water pipe. The cooling tower is connected to the cooling water tank via a second return water pipe. The heat exchange component includes a shell. Cooling water inlets connected to the water supply pipe and cooling water outlets connected to the first return water pipe are respectively provided on both sides of the shell. Heat distribution plates are arranged at intervals inside the shell. Heat exchange tubes are coiled on the heat distribution plates. One end of each heat exchange tube is connected to an oil inlet connected to the oil supply pipe, and the other end is connected to an oil outlet connected to the return oil pipe.

[0006] Preferably, it also includes a controller, an oil temperature sensor installed on the oil pipeline, a water temperature sensor and a flow meter installed on the water pipeline, and the oil temperature sensor, water temperature sensor, flow meter, first water pump and cooling tower are all electrically connected to the controller.

[0007] Preferably, the cooling tower includes a tower body, an axial flow fan is installed at the top of the tower body, a coil is provided inside the tower body, a water spray assembly is provided above the coil, and an air inlet is provided on the tower body below the coil.

[0008] Preferably, the water spraying assembly includes a support frame with water spraying pipes arranged at intervals on the support frame. Multiple nozzles are installed at intervals on each water spraying pipe. A water collection tank is provided at the bottom of the tower body. The water spraying pipes are connected to the water collection tank through a main pipe. A second water pump is provided on the main pipe.

[0009] Preferably, grooves are provided on both sides of each heat exchange tube section on the heat spreader plate.

[0010] The beneficial effects of this utility model are as follows: by combining the heat exchange plate and the coiled heat exchange tube in the heat exchange component, the heat exchange efficiency between fire-resistant oil and cooling water is greatly improved, and the EH oil temperature can be quickly controlled within a suitable range of 30~50℃, avoiding the oil temperature from exceeding 60℃; the uniform distribution design of the oil inlet ensures that all fire-resistant oil can be fully cooled, and the closed-loop water circulation formed by the cooling tower and cooling water tank can continuously and stably remove heat, effectively solving the problem of excessively high oil temperature caused by mechanical friction, oil pump heating, etc. Attached Figure Description

[0011] The present invention will be further described with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present invention. For those skilled in the art, other drawings can be obtained based on the following drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the structure of a cooling device for an electro-hydraulic regulating system of a steam turbine according to the present invention.

[0013] Figure 2 This is a schematic diagram of the heat exchange component structure of a cooling device for an electro-hydraulic regulating system of a steam turbine according to the present invention.

[0014] Figure 3 This is another structural schematic diagram of the heat exchange component of the cooling device of the electro-hydraulic regulating system of a steam turbine according to this utility model.

[0015] Figure 4 This is a schematic diagram of the cooling tower structure of a steam turbine electro-hydraulic regulating system cooling device, which is a utility model.

[0016] Figure 5 for Figure 3 A partial schematic diagram of point A in the middle.

[0017] Figure 6 for Figure 4 A partial schematic diagram at point B in the middle.

[0018] The labels in the diagram represent: 1. Oil tank; 2. Heat exchange assembly; 3. Cooling water tank; 4. Oil delivery pipe; 5. Oil pump; 6. Oil return pipe; 7. Water delivery pipe; 8. First water pump; 9. First return water pipe; 10. Cooling tower; 11. Second return water pipe; 12. Shell; 13. Cooling water inlet; 14. Cooling water outlet; 15. Heat spreader; 16. Heat exchange tube; 17. Oil inlet; 18. Oil outlet; 19. Oil temperature sensor; 20. Water temperature sensor; 21. Flow meter; 22. Tower body; 23. Axial flow fan; 24. Coil; 25. Air inlet; 26. Support; 27. Water spray pipe; 28. Spray nozzle; 29. ​​Water collection pool; 30. Main pipe; 31. Second water pump; 32. Tank. Detailed Implementation

[0019] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0020] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0021] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] See Figures 1 to 6As shown, the structure of this utility model is as follows: a cooling device for a steam turbine electro-hydraulic regulating system, including an oil tank 1, a heat exchange assembly 2, and a cooling water tank 3. The oil tank 1 is connected to the oil inlet of the heat exchange assembly 2 via an oil supply pipe 4, and an oil pump 5 is installed on the oil supply pipe 4. The oil outlet of the heat exchange assembly 2 is connected to the oil tank 1 via a return oil pipe 6. The cooling water tank 3 is connected to the water inlet of the heat exchange assembly 2 via a water supply pipe 7, and a first water pump 8 is installed on the water supply pipe 7. The water outlet of the heat exchange assembly 2 is connected to a cooling tower 10 via a first return water pipe 9. The cooling tower 10 is connected to the cooling water tank 3 through the second return water pipe 11. The heat exchange component 2 includes a shell 12. The shell 12 has a cooling water inlet 13 connected to the water supply pipe 7 and a cooling water outlet 14 connected to the first return water pipe 9 on both sides. Heat distribution plates 15 are arranged at intervals inside the shell 12. Heat exchange tubes 16 are coiled on the heat distribution plates 15. One end of each heat exchange tube 16 is connected to an oil inlet 17 connected to the oil supply pipe 4, and the other end is connected to an oil outlet 18 connected to the return oil pipe 6. Specifically. During operation, oil pump 5 starts and draws high-temperature fire-resistant oil from oil tank 1. The oil is then transported to oil inlet 17 through oil delivery pipe 4. Oil inlet 17 evenly distributes the fire-resistant oil to the heat exchange tubes 16 coiled on each heat exchange plate 15 inside the shell 12, ensuring that each heat exchange tube 16 is filled with oil and participates in heat exchange. At the same time, first water pump 8 draws low-temperature cooling water from cooling water tank 3 and sends it into the interior of shell 12 through water delivery pipe 7 and cooling water inlet 13, so that the cooling water flows between the spaced heat exchange plates 15. The heat spreader 15, with its high thermal conductivity, quickly absorbs the heat from the fire-resistant oil in the heat exchange tubes 16 and transfers it to the flowing cooling water. The coiled design of the heat exchange tubes 16 significantly increases the contact area between the oil and the heat spreader 15, further enhancing the heat transfer efficiency. After heat exchange, the cooled fire-resistant oil collects from each heat exchange tube 16 to the oil outlet 18, and then flows back to the oil tank 1 via the return oil pipe 6, maintaining a stable oil temperature in the oil tank 1. The high-temperature cooling water, after absorbing heat, enters the cooling tower 10 through the cooling water outlet 14 and the first return water pipe 9 to cool down. The cooled cooling water finally flows back to the cooling water tank 3 via the second return water pipe 11, forming a cycle of cooling water.

[0023] like Figure 1As shown, the system also includes a controller. An oil temperature sensor 19 is installed on the oil supply pipe 4, and a water temperature sensor 20 and a flow meter 21 are installed on the water supply pipe 7. The oil temperature sensor 19, water temperature sensor 20, flow meter 21, first water pump 8, and cooling tower 10 are all electrically connected to the controller. Specifically, the oil temperature sensor 19 monitors the temperature of the fire-resistant oil in the oil supply pipe 4, the water temperature sensor 20 monitors the initial temperature of the cooling water in the water supply pipe 7, and the flow meter 21 provides feedback on the real-time flow rate of the cooling water. All three transmit their signals synchronously to the controller. The controller compares the actual oil temperature with a set threshold. If the oil temperature is higher than the threshold, it can increase the output power of the first water pump 8 to increase the cooling water flow rate or enhance the heat dissipation intensity of the cooling tower 10 to accelerate the heat removal rate. If the oil temperature is lower than the threshold, it can adjust in the opposite direction, such as reducing the water pump flow rate or weakening the heat dissipation of the cooling tower 10, to prevent the oil viscosity from increasing due to excessively low temperature, which would lead to increased load on the oil pump 5 or delayed operation of the electro-hydraulic valve.

[0024] like Figure 4 As shown, the cooling tower 10 includes a tower body 22, an axial flow fan 23 is installed on the top of the tower body 22, a coil 24 is provided inside the tower body 22, a water spraying assembly is provided above the coil 24, and an air inlet 25 is provided on the tower body 22 below the coil 24. Specifically, high-temperature cooling water enters the coil 24 inside the tower body 22, the axial flow fan 23 starts and draws in outside cold air from the air inlet 25 below the tower body 22, and the cold air flows from bottom to top through the coil 24 under the drive of the fan; at the same time, the water spraying assembly above the coil 24 sprays water onto the outer wall of the coil 24 to form a uniform water film. At this time, the cold air exchanges heat with the water film on the outer wall of the coil 24 and the high-temperature cooling water inside the coil 24: on the one hand, the cold air carries away the sensible heat of the water film and the coil 24, and on the other hand, some of the spray water evaporates and absorbs a large amount of latent heat. Under the dual action, the temperature of the cooling water inside the coil 24 is rapidly reduced; the cooled water flows out of the coil 24 and eventually flows back to the cooling water tank 3, while the humid and hot air that has absorbed heat is discharged from the top of the tower body 22 through the axial flow fan 23.

[0025] like Figure 4 , Figure 6As shown, the water spraying assembly includes a support 26, on which water spray pipes 27 are arranged at intervals. Multiple nozzles 28 are installed at intervals on each water spray pipe 27. A water collection tank 29 is located at the bottom of the tower body 22. The water spray pipes 27 are connected to the water collection tank 29 via a main pipe 30. A second water pump 31 is installed on the main pipe 30. Specifically, after the second water pump 31 is started, it draws water from the water collection tank 29 at the bottom of the tower body 22 to the main pipe 30. The main pipe 30 then evenly distributes the water to the nozzles 28 arranged at intervals on the support 26. The water spray pipe 27 has multiple nozzles 28 that atomize water into fine droplets and spray them evenly onto the outer wall of the coil 24 below, forming a large-area, thin water film. This significantly increases the contact area between the water and the coil 24 and the air, enhancing the evaporative cooling effect. The unevaporated spray water slides down the outer wall of the coil 24 under the action of gravity and eventually falls back into the water collection tank 29, where it is pumped back to the water spray pipe 27 by the second water pump 31, forming a closed-loop circulation of spray water and reducing water consumption.

[0026] like Figure 5 As shown, the heat exchange plate 15 has grooves 32 on both sides of each heat exchange tube 16. Specifically, the grooves 32 can guide the cooling water to be distributed more evenly around the heat exchange tube 16, ensuring that the heat transferred from each heat exchange tube 16 to the heat exchange plate 15 can be carried away by the cooling water in time, further improving the overall heat exchange uniformity and efficiency of the heat exchange assembly 2.

[0027] In practical use, during operation, the oil pump 5 starts first, drawing high-temperature fire-resistant oil from the oil tank 1 and delivering it to the oil inlet 17 through the oil delivery pipe 4. The oil inlet 17 then plays a diversion role, evenly distributing the fire-resistant oil to the heat exchange tubes 16 coiled on each heat exchange plate 15 inside the heat exchange component 2 housing 12, ensuring that each heat exchange tube 16 is filled with oil to fully participate in heat exchange. At the same time, the first water pump 8 starts synchronously, drawing low-temperature cooling water from the cooling water tank 3 and sending it into the housing 12 through the water delivery pipe 7 and the cooling water inlet 13 on the side of the housing 12, so that the cooling water flows smoothly between the spaced heat exchange plates 15. During this process, the heat exchange plate 15, with its high thermal conductivity, quickly absorbs the heat transferred from the fire-resistant oil in the heat exchange tube 16 and efficiently transfers the heat to the cooling water flowing between the heat exchange plates 15. The coiled design of the heat exchange tube 16 significantly increases the contact area between the fire-resistant oil and the heat exchange plate 15, further enhancing the heat transfer efficiency and achieving indirect and efficient heat exchange between the fire-resistant oil and the cooling water. After the heat exchange is completed, the fire-resistant oil with a significantly reduced temperature flows out from each heat exchange tube 16, collects in the oil outlet 18, and then flows back to the oil tank 1 through the return oil pipe 6, maintaining the stable temperature of the fire-resistant oil in the oil tank 1 to meet the requirements of the turbine electro-hydraulic regulation system. The cooling water, whose temperature rises after absorbing heat, enters the cooling tower 10 through the cooling water outlet 14 on the shell 12 side and the first return water pipe 9 for cooling treatment. The cooled cooling water finally flows back to the cooling water tank 3 through the second return water pipe 11, forming a cycle of cooling water and ensuring the continuous and stable operation of the entire cooling device.

[0028] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the substance and scope of the present invention. Various modifications made by those skilled in the art to the above embodiments after reading this specification are all within the scope of protection of the present invention.

Claims

1. A cooling device for a steam turbine electro-hydraulic regulating system, characterized in that: The system includes an oil tank (1), a heat exchange assembly (2), and a cooling water tank (3). The oil tank (1) is connected to the oil inlet of the heat exchange assembly (2) via an oil supply pipe (4). An oil pump (5) is installed on the oil supply pipe (4). The oil outlet of the heat exchange assembly (2) is connected to the oil tank (1) via a return oil pipe (6). The cooling water tank (3) is connected to the water inlet of the heat exchange assembly (2) via a water supply pipe (7). A first water pump (8) is installed on the water supply pipe (7). The water outlet of the heat exchange assembly (2) is connected to a cooling tower (10) via a first return water pipe (9). The cooling tower (10) is connected to the cooling water tank (3) via a second return water pipe (11). The heat exchange assembly (2) includes a shell (12). The shell (12) has a cooling water inlet (13) connected to the water supply pipe (7) and a cooling water outlet (14) connected to the first return water pipe (9) on both sides. Heat exchange plates (15) are arranged at intervals inside the shell (12). Heat exchange tubes (16) are coiled on the heat exchange plates (15). One end of each heat exchange tube (16) is connected through an oil inlet (17) and the oil inlet (17) is connected to the oil supply pipe (4). The other end of each heat exchange tube (16) is connected through an oil outlet (18) and the oil outlet (18) is connected to the return oil pipe (6).

2. The cooling device for the electro-hydraulic regulating system of a steam turbine according to claim 1, characterized in that: It also includes a controller. An oil temperature sensor (19) is installed on the oil pipeline (4), and a water temperature sensor (20) and a flow meter (21) are installed on the water pipeline (7). The oil temperature sensor (19), the water temperature sensor (20), the flow meter (21), the first water pump (8), and the cooling tower (10) are all electrically connected to the controller.

3. The cooling device for the electro-hydraulic regulating system of a steam turbine according to claim 1, characterized in that: The cooling tower (10) includes a tower body (22), an axial flow fan (23) is installed on the top of the tower body (22), a coil (24) is provided inside the tower body (22), a water spraying assembly is provided above the coil (24), and an air inlet (25) is provided on the tower body (22) below the coil (24).

4. The cooling device for the electro-hydraulic regulating system of a steam turbine according to claim 3, characterized in that: The water spraying assembly includes a support (26), on which water spraying pipes (27) are arranged at intervals, and each water spraying pipe (27) is equipped with multiple nozzles (28) at intervals. A water collection tank (29) is provided at the bottom of the tower body (22). The water spraying pipes (27) are connected to the water collection tank (29) through a main pipe (30). A second water pump (31) is provided on the main pipe (30).

5. The cooling device for the electro-hydraulic regulating system of a steam turbine according to claim 1, characterized in that: The heat exchange plate (15) has grooves (32) on both sides of each heat exchange tube (16).

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