Device for controlling and regulating the conductivity of generator stator cooling water

Abstract

A device for controlling and regulating the conductivity of generator stator cooling water, comprising pipes (2) for the stator cooling water, which are installed on the stator coils of a steam power plant generator (1), wherein ends of the pipes (2) are connected to the water outlet of the stator coils of the steam power plant generator (1), and the other ends of the pipes (2) are connected to the water inlet of the stator coils of the steam power plant generator (1), characterized in that a first cooler (4), a second cooler (5), a first water pump (6), a second water pump (7), a mixing reactor, an electric heater (10), a first filter device (11) and a second filter device (12) are arranged successively on the pipes (2) in the direction of flow, wherein the first cooler (4) and the second cooler (5) cool the stator cooling water;After cooling, the stator cooling water enters the mixing reactor, where it reacts with the alkaline solution contained therein, forming precipitates containing copper ions; and after filtering the precipitates in the stator cooling water through the first filter device (11) and the second filter device (12), the water flows back into the stator coils of the steam power plant generator (1).

Description

Technical area

[0001] The present utility model relates to the field of steam power plant technology, and in particular to a device for controlling and regulating the conductivity of generator stator cooling water. State of the art

[0002] The generator is one of the main components of a power plant. Currently, hollow copper materials are used for the stator coils of steam power plant generators. During operation, specially treated cooling water is circulated inside the coils to dissipate the heat generated within the coils. With prolonged operation, the metal ions in the stator cooling water system become predominantly copper. This leads to excessively high conductivity of the cooling water, causing significant leakage current, accelerating the aging of the insulating water pipes, and potentially resulting in phase flashovers within the generator—in extreme cases, even damage to the generator itself. Conventional solutions primarily involve increasing the water intake and discharge in the stator cooling water system, i.e., intensifying water exchange.However, this procedure causes significant water consumption and environmental pollution. Therefore, a device for controlling and regulating the conductivity of generator stator cooling water is proposed. Content of the utility model

[0003] To overcome the disadvantages of the prior art, a device for controlling and regulating the conductivity of generator stator cooling water is provided according to the present utility model. The present utility model aims to control the conductivity within a permissible range, protect the generator insulation, and conserve water resources. For this purpose, the device has circulating pipes for the stator cooling water around the stator coils of a steam power plant generator. The following components are arranged on the pipes: a first cooler, a second cooler, a first water pump, a second water pump, a mixing reactor, an electric heater, a first filter device, and a second filter device.

[0004] To achieve the above utility model objective, the following technical solution is applied according to the present utility model: A device for controlling and regulating the conductivity of generator stator cooling water comprises pipes for the stator cooling water, which are installed on the stator coils of a steam power plant generator, wherein ends of the pipes are connected to the water outlet of the stator coils of the steam power plant generator, and the other ends of the pipes are connected to the water inlet of the stator coils of the steam power plant generator, characterized in that a first cooler, a second cooler, a first water pump, a second water pump, a mixing reactor, an electric heater, a first filter device and a second filter device are arranged successively on the pipes in the direction of flow, wherein the first cooler and the second cooler cool the stator cooling water; after cooling, the stator cooling water enters the mixing reactor, where it reacts with the alkaline solution contained therein and forms precipitates containing copper ions;and after the precipitates in the stator cooling water have been filtered through the first filter device and the second filter device, the water flows back into the stator coils of the steam power plant generator.

[0005] The first cooler, the first water pump, and the first filter device are arranged in a coordinated manner on a circulating pipe, and valves are provided at both ends of the first cooler and at both ends of the first filter device. The second cooler, the second water pump, and the second filter device are arranged in a coordinated manner on another circulating pipe, and valves are provided at both ends of the second cooler and at both ends of the second filter device.

[0006] The mixing reactor comprises a cylinder body, a cylinder cover, a first solenoid valve, and a first vent line, wherein the side of the cylinder body is connected to the inlets of the pipes, a sight window is provided on the side of the cylinder body, a suitable cylinder cover is arranged above the cylinder body, a first solenoid valve is provided at the lower end of the cylinder body, the water outlet end of the first solenoid valve is connected to the pipe, a first vent line is arranged on the cylinder cover, the first vent line is connected to an external suction blower, a gas valve is provided on the first vent line, and a stirring device is arranged inside the cylinder body.

[0007] The stirring device comprises a drive motor, an inner gear and stirring rods, wherein the drive motor is arranged on the upper inner wall of the cylinder body, a drive gear is provided on the output shaft of the drive motor, the inner gear is arranged below the drive motor, the inner gear is rotatably connected to the inner wall of the cylinder body via a bearing, the drive gear and the inner gear are in mesh, stirring rods are distributed on the lower surface of the inner gear, and stirring vanes are distributed on the stirring rods.

[0008] A sealing ring is provided between the cylinder cover and the opening of the cylinder body, a second solenoid valve is provided in the middle of the upper surface of the cylinder cover, the second solenoid valve is in contact with the cylinder body, and a metering device is arranged above the second solenoid valve.

[0009] The metering device comprises a material cylinder, a sealing cover and a second vent line, wherein the lower end of the material cylinder is connected to the second solenoid valve, a suitable sealing cover is arranged above the material cylinder, a sealing ring is provided between the sealing cover and the upper opening of the material cylinder, a second vent line is arranged on the sealing cover, the second vent line is connected to an external suction blower, and a gas valve is provided on the second vent line.

[0010] A temperature sensor is provided on the pipe between the first solenoid valve and the electric heater; the temperature sensor is connected to the electric heater via a signal; a T-piece is installed on the pipe at the outlet end of the electric heater; and the first filter device and the second filter device are provided at the two outlet ends of the T-piece on the pipe.

[0011] The first filter device and the second filter device have the same structure; the first filter device comprises a sedimentation box and a lid, with an opening provided above the sedimentation box, and the matching lid arranged at the opening of the sedimentation box, a sealing ring provided between the lid and the upper opening of the sedimentation box, a third vent line arranged on the lid, the third vent line connected to an external suction blower, a gas valve provided on the third vent line, and filter components distributed inside the sedimentation box, arranged one after the other in the direction of flow.

[0012] The filter components comprise fixed frames, filter screens, sedimentation housings and support plates, wherein the support plates are provided at the lower ends of the fixed frames, the filter screens are arranged inside the fixed frames, the sedimentation housings are distributed successively from top to bottom on the sides of the fixed frames facing the flow, the two ends of the sedimentation housings are sealed, and a filter screen is provided on each sedimentation housing, a boundary ring is arranged on each fixed frame, longitudinal boundary slots are distributed symmetrically on the inner walls of the boundary rings, and the fixed frames are arranged in the corresponding two boundary slots.

[0013] The device described in this utility model for controlling and regulating the conductivity of generator stator cooling water is highly practical and very easy to operate. The stator cooling water is cooled by the first and second coolers; a mixing reactor allows the copper ions in the stator cooling water to react with the alkaline solution it contains, forming copper ion deposits, thereby purifying the stator cooling water; the first and second filter devices facilitate the filtering of the copper ion deposits in the stator cooling water, control the conductivity within a permissible range, protect the generator insulation, and conserve water resources. Description of the attached drawings Fig. Figure 1 is a schematic perspective view of the present utility model; Fig. Figure 2 is a cross-section of a mixing reactor of the present utility model; and Fig. Figure 3 is a cross-section of a first filter device of the present utility model;

[0014] In the figures: 1-steam power plant generator; 2-pipe; 3-valve; 4-first radiator; 5-second radiator; 6-first water pump; 7-second water pump; 8-cylinder body; 9-sighting window; 10-electric heater; 11-first filter device; 12-second filter device; 13-cylinder cover; 14-first solenoid valve; 15-drive motor; 16-drive gear; 17-inner gear; 18-bearing; 19-agitator rod; 20-agitator vane; 21-first vent line; 22-material cylinder; 23-sealing cover; 24-second solenoid valve; 25-second vent line; 26-sedimentation box; 27-cover; 28-third vent line; 29-Fixed frame; 30-Filter mesh; 31-Support plate; 32-Sedimentation housing; 33-Limiting ring; and 34-Limiting slot. Examples of implementation

[0015] The present utility model can be explained in detail by the following exemplary embodiments, and the purpose of disclosing the present utility model is to protect all technical improvements within the scope of protection of the present utility model.

[0016] With reference to the Fig.1 to 3 comprises a device for controlling and regulating the conductivity of generator stator cooling water. Pipes 2 for the stator cooling water are installed on the stator coils of a steam power plant generator 1, wherein ends of the pipes 2 are connected to the water outlet of the stator coils of the steam power plant generator 1, and the other ends of the pipes 2 are connected to the water inlet of the stator coils of the steam power plant generator 1, characterized in that a first cooler 4, a second cooler 5, a first water pump 6, a second water pump 7, a mixing reactor, an electric heater 10, a first filter device 11 and a second filter device 12 are arranged successively on the pipes 2 in the direction of flow, wherein the first cooler 4 and the second cooler 5 cool the stator cooling water;After cooling, the stator cooling water enters the mixing reactor, where it reacts with the alkaline solution contained therein, forming precipitates containing copper ions; and after filtering the precipitates in the stator cooling water through the first filter device 11 and the second filter device 12, the water flows back into the stator coils of the steam power plant generator 1.

[0017] The first cooler 4, the first water pump 6 and the first filter device 11 are arranged in a coordinated manner on a circulating pipe 2, and valves 3 are provided at both ends of the first cooler 4 and at both ends of the first filter device 11.

[0018] The second cooler 5, the second water pump 7 and the second filter device 12 are arranged in a coordinated manner on a further circulating pipe 2, and valves 3 are provided at both ends of the second cooler 5 and at both ends of the second filter device 12.

[0019] The mixing reactor comprises a cylinder body 8, a cylinder cover 13, a first solenoid valve 14, and a first vent line 21. The side of the cylinder body 8 is connected to the inlets of the pipes 2. A sight glass 9 is provided on the side of the cylinder body 8. A matching cylinder cover 13 is arranged above the cylinder body 8. A first solenoid valve 14 is provided at the lower end of the cylinder body 8. The water outlet of the first solenoid valve 14 is connected to the pipe 2. A first vent line 21 is arranged on the cylinder cover 13. The first vent line 21 is connected to an external suction blower. A gas valve is provided on the first vent line 21. The external suction blower evacuates the air from the cylinder body 8 via the first vent line 21 to prevent carbon dioxide from mixing into the stator cooling water circuit system.A stirring device is arranged inside the cylinder body 8.

[0020] The stirring device comprises a drive motor 15, an internal gear 17, and stirring rods 19. The drive motor 15 is arranged on the upper inner wall of the cylinder body 8. A drive gear 16 is provided on the output shaft of the drive motor 15. The internal gear 17 is arranged below the drive motor 15. The internal gear 17 is rotatably connected to the inner wall of the cylinder body 8 via a bearing 18. The drive gear 16 and the internal gear 17 are in mesh. Stirring rods 19 are distributed on the lower surface of the internal gear 17, and agitator vanes 20 are distributed on the stirring rods 19. The rotation of the drive motor 15 causes the drive gear 16 to drive the internal gear 17, thereby rotating the stirring rods 19 and completely reacting the copper-ion-containing stator cooling water with the alkaline solution, thus improving the cleaning quality of the stator cooling water.

[0021] A sealing ring is provided between the cylinder cover 13 and the opening of the cylinder body 8. A second solenoid valve 24 is provided in the center of the upper surface of the cylinder cover 13. This second solenoid valve 24 is connected to the cylinder body 8, and a metering device is arranged above the second solenoid valve 24. The alkaline solution is stored in the metering device.

[0022] The metering device comprises a material cylinder 22, a sealing cover 23, and a second vent line 25, wherein the lower end of the material cylinder 22 is connected to the second solenoid valve 24, a matching sealing cover 23 is arranged above the material cylinder 22, a sealing ring is provided between the sealing cover 23 and the upper opening of the material cylinder 22, a second vent line 25 is arranged on the sealing cover 23, the second vent line 25 is connected to an external suction blower, and a gas valve is provided on the second vent line 25. The external suction blower evacuates the air in the material cylinder 22 via the second vent line 25 to prevent carbon dioxide from mixing into the stator cooling water circuit system, and an agitator is arranged in the cylinder body 8.

[0023] A temperature sensor is provided on the pipe 2 between the first solenoid valve 14 and the electric heater 10, the temperature sensor is connected to the electric heater 10 via a signal, a T-piece is installed on the pipe 2 at the outlet end of the electric heater 10, and the first filter device 11 and the second filter device 12 are provided at the two outlet ends of the T-piece on the pipe 2.

[0024] The first filter device 11 and the second filter device 12 have the same structure. The first filter device 11 comprises a sedimentation box 26 and a cover 27. An opening is provided above the sedimentation box 26, and the matching cover 27 is arranged at the opening of the sedimentation box 26. A sealing ring is provided between the cover 27 and the upper opening of the sedimentation box 26. A third vent line 28 is arranged on the cover 27. The third vent line 28 is connected to an external suction blower, and a gas valve is provided on the third vent line 28. The external suction blower evacuates the air in the sedimentation box 26 via the third vent line 28 to prevent carbon dioxide from mixing into the stator cooling water circuit system. An agitator is arranged in the cylinder body 8.Inside the sedimentation box 26, filter components are distributed, arranged one after the other in the direction of flow.

[0025] The filter components comprise fixed frames 29, filter nets 30, sedimentation housings 32 and support plates 31, wherein the support plates 31 are provided at the lower ends of the fixed frames 29, the filter nets 30 are arranged inside the fixed frames 29, the sedimentation housings 32 are distributed successively from top to bottom on the sides of the fixed frames 29 facing the flow, the two ends of the sedimentation housings 32 are sealed, and a filter net 30 is provided on each sedimentation housing 32. The water flow impacts the filter nets 30 of the fixed frames 29, the filter nets 30 filter the copper ion precipitates, the precipitates fall from the filter nets 30 and enter the individual sedimentation chambers 32 on the sides of the fixed frames 29, thereby facilitating the passage of the water flow and simultaneously collecting the copper ion precipitates, thus facilitating the subsequent removal of the filter components for cleaning.Each fixed frame 29 has a limiting ring 33. Longitudinal limiting slots 34 are distributed symmetrically on the inner walls of the limiting rings 33. The fixed frames 29 are positioned in the corresponding two limiting slots 34. The limiting rings 33 prevent the fixed frames 29 from being displaced or falling over in the event of impacts, thus improving the filter quality.

[0026] When using the device for controlling and regulating the conductivity of generator stator cooling water according to the example, an external suction blower first evacuates the air in the cylinder body 8 via the first vent line 21 and the air in the sedimentation box 26 via the third vent line 28. Subsequently, the alkaline solution is filled into the material cylinder 22; after the sealing cover 23 is fitted, an external suction blower evacuates the air in the material cylinder 22 via the second vent line 25 to prevent carbon dioxide from mixing into the stator cooling water circuit system. By opening the valves 3, the stator cooling water enters the first cooler 4 and the second cooler 5 via the pipes 2. The first cooler 4 and the second cooler 5 cool the stator cooling water. The first water pump 6 and the second water pump 7 pump the cooled stator cooling water into the mixing reactor.The second solenoid valve 24 opens, allowing the alkaline solution to enter the cylinder body 8. The rotation of the drive motor 15 causes the drive gear 16 to drive the inner gear 17, which rotates the stirrer bars 19 and causes the copper-ion-containing stator cooling water to react completely with the alkaline solution, thus improving the purification quality of the stator cooling water. The first solenoid valve 14 opens, and the purified stator cooling water carries the copper ion deposits into the electric heater 10. A temperature sensor on the tubes 2 between the first solenoid valve 14 and the electric heater 10 measures the temperature of the stator cooling water; if the temperature falls below the limit, the electric heater 10 heats the stator cooling water to control the conductivity within an acceptable range. The stator cooling water then enters the first filter device 11 and the second filter device 12, respectively.The water flow impacts the filter screens 30 of the fixed frames 29, and the filter screens 30 filter the copper ion deposits. The deposits fall from the filter screens 30 and enter the individual sedimentation chambers 32 on the sides of the fixed frames 29, thus facilitating the passage of the water flow and simultaneously collecting the copper ion deposits. This facilitates the subsequent removal of the filter components for cleaning. The limiting rings 33 prevent the fixed frames 29 from being displaced or tipping over in the event of impacts, thereby improving the filter quality. The filtered stator cooling water enters the water supply to the stator coils of the steam power plant generator 1 via the pipes 2, thus completing the circuit, protecting the generator insulation, and conserving water resources.

[0027] The parts of the present utility model not described in detail are part of the prior art. Although the present utility model has been specifically presented and described with reference to preferred embodiments, there are many methods and ways to implement this technical scheme in practice. The embodiments described above are merely preferred implementations of the present utility model, but those skilled in the art should understand that, without deviating from the spirit and scope of protection of the present utility model as defined by the appended claims, various modifications to the present utility model in form and detail are possible, each of which falls within the scope of protection of the present utility model.

Claims

[1] A device for controlling and regulating the conductivity of generator stator cooling water, comprising pipes (2) for the stator cooling water installed on the stator coils of a steam power plant generator (1), wherein ends of the pipes (2) are connected to the water outlet of the stator coils of the steam power plant generator (1), and the other ends of the pipes (2) are connected to the water inlet of the stator coils of the steam power plant generator (1), characterized by, that on the pipes (2) in the direction of flow a first cooler (4), a second cooler (5), a first water pump (6), a second water pump (7), a mixing reactor, an electric heater (10), a first filter device (11) and a second filter device (12) are arranged successively, wherein the first cooler (4) and the second cooler (5) cool the stator cooling water; after cooling, the stator cooling water enters the mixing reactor, where it reacts with the alkaline solution contained therein, forming precipitates containing copper ions; and after filtering the precipitates in the stator cooling water through the first filter device (11) and the second filter device (12), the water flows back into the stator coils of the steam power plant generator (1). [2] The device for controlling and regulating the conductivity of generator stator cooling water according to claim 1, characterized by, that the first cooler (4), the first water pump (6) and the first filter device (11) are arranged in a coordinated manner on a circulating pipe (2), and valves (3) are provided at both ends of the first cooler (4) and at both ends of the first filter device (11). [3] The device for controlling and regulating the conductivity of generator stator cooling water according to claim 1, characterized by , that the second cooler (5), the second water pump (7) and the second filter device (12) are arranged in a coordinated manner on a further circulating pipe (2), and valves (3) are provided at both ends of the second cooler (5) and at both ends of the second filter device (12). [4] The device for controlling and regulating the conductivity of generator stator cooling water according to claim 1, characterized by, that the mixing reactor comprises a cylinder body (8), a cylinder cover (13), a first solenoid valve (14) and a first vent line (21), wherein the side of the cylinder body (8) is connected to the inlets of the pipes (2), a sight window (9) is provided on the side of the cylinder body (8), a matching cylinder cover (13) is arranged above the cylinder body (8), a first solenoid valve (14) is provided at the lower end of the cylinder body (8), the water outlet end of the first solenoid valve (14) is connected to the pipe (2), a first vent line (21) is arranged on the cylinder cover (13), the first vent line (21) is connected to an external suction blower, a gas valve is provided on the first vent line (21), and a stirring device is arranged inside the cylinder body (8). [5] The device for controlling and regulating the conductivity of generator stator cooling water according to claim 4, characterized by , that the stirring device comprises a drive motor (15), an inner gear (17) and stirring rods (19), wherein the drive motor (15) is arranged on the upper inner wall of the cylinder body (8), a drive gear (16) is provided on the output shaft of the drive motor (15), the inner gear (17) is arranged below the drive motor (15), the inner gear (17) is rotatably connected to the inner wall of the cylinder body (8) via a bearing (18), the drive gear (16) and the inner gear (17) are in mesh, stirring rods (19) are distributed on the lower surface of the inner gear (17), and stirring vanes (20) are distributed on the stirring rods (19). [6] The device for controlling and regulating the conductivity of generator stator cooling water according to claim 4, characterized by, that a sealing ring is provided between the cylinder cover (13) and the opening of the cylinder body (8), a second solenoid valve (24) is provided in the middle of the upper surface of the cylinder cover (13), the second solenoid valve (24) is in contact with the cylinder body (8), and a metering device is arranged above the second solenoid valve (24). [7] The device for controlling and regulating the conductivity of generator stator cooling water according to claim 6, characterized by, that the metering device comprises a material cylinder (22), a sealing cover (23) and a second vent line (25), wherein the lower end of the material cylinder (22) is connected to the second solenoid valve (24), a suitable sealing cover (23) is arranged above the material cylinder (22), a sealing ring is provided between the sealing cover (23) and the upper opening of the material cylinder (22), a second vent line (25) is arranged on the sealing cover (23), the second vent line (25) is connected to an external suction blower, and a gas valve is provided on the second vent line (25). [8] The device for controlling and regulating the conductivity of generator stator cooling water according to claim 4, characterized by, that a temperature sensor is provided on the pipe (2) between the first solenoid valve (14) and the electric heater (10), the temperature sensor is connected to the electric heater (10) via a signal, a T-piece is installed on the pipe (2) at the outlet end of the electric heater (10), and the first filter device (11) and the second filter device (12) are provided on the two outlet ends of the T-piece on the pipe (2). [9] The device for controlling and regulating the conductivity of generator stator cooling water according to claim 8, characterized by, that the first filter device (11) and the second filter device (12) have the same structure, the first filter device (11) comprises a sedimentation box (26) and a lid (27), wherein an opening is provided above the sedimentation box (26), and the matching lid (27) is arranged at the opening of the sedimentation box (26), a sealing ring is provided between the lid (27) and the upper opening of the sedimentation box (26), a third vent line (28) is arranged on the lid (27), the third vent line (28) is connected to an external suction blower, a gas valve is provided on the third vent line (28), and filter components are distributed inside the sedimentation box (26) in succession in the direction of flow. [10] The device for controlling and regulating the conductivity of generator stator cooling water according to claim 9, characterized by, that the filter components comprise fixed frames (29), filter nets (30), sedimentation housings (32) and support plates (31), wherein the support plates (31) are provided at the lower ends of the fixed frames (29), the filter nets (30) are arranged inside the fixed frames (29), the sedimentation housings (32) are distributed successively from top to bottom on the sides of the fixed frames (29) facing the flow, the two ends of the sedimentation housings (32) are sealed, and a filter net (30) is provided on each sedimentation housing (32), a boundary ring (33) is arranged on each fixed frame (29), longitudinal boundary slots (34) are distributed symmetrically on the inner walls of the boundary rings (33), and the fixed frames (29) are arranged in the corresponding two boundary slots (34).

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