Device for reducing electric conductivity of stator cooling water of generator

Abstract

A device for reducing electric conductivity of stator cooling water of a generator relates to the technical field of thermal power generation and comprises a stator cooling water pipe mounted on a stator coil of a thermal power generator, one end of the water pipe is connected with a water outlet end of the stator coil of the thermal power generator, and the other end of the water pipe is connected with a water inlet end of the stator coil of the thermal power generator. A first cooler, a second cooler, a first water pump, a second water pump, a mixing reactor, an electric heater, a first filtering device and a second filtering device are sequentially arranged on the water pipe in the water flow direction; the cooling device is high in practicability and very convenient to use, and stator cooling water is cooled through the first cooler and the second cooler; by arranging the mixing reactor, copper ions in the stator cooling water react with alkali liquor in the stator cooling water to form copper ion precipitates, and the stator cooling water is purified; by arranging the first filtering device and the second filtering device, copper ion precipitates in stator cooling water can be conveniently filtered, the conductivity is controlled to be within a qualified range, insulation of a generator is protected, and water resources are saved.

Description

Technical Field

[0001] The invention relates to the technical field of thermal power generation, in particular to a device for reducing the conductivity of cooling water of a generator. Background Art

[0002] Generator is one of the main equipments in power plant. At present, the stator coil of generator in thermal power plant is made of hollow copper. During operation, specially treated cooling water is passed into the coil for cooling, which takes away the heat generated by the coil during the operation of the generator. During the long-term operation of the generator, most of the metal ions in the cooling water system are copper ions, which causes the conductivity of the cooling water to be too high, causing a large leakage current, aging of the insulating water pipe, and flashover between the generator phases, and even damage to the generator. The traditional method is to increase the water replenishment and drainage of the cooling water system, that is, to strengthen water replacement, which will cause a large waste of water resources and environmental pollution. Therefore, we propose a device to reduce the conductivity of the cooling water of the generator. Summary of the invention

[0003] In order to overcome the shortcomings in the background technology, the present invention discloses a device for reducing the conductivity of generator cooling water. The present invention arranges a circulatory cooling water pipe on the stator coil of the thermal generator, and arranges 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 on the water pipe to achieve the purpose of controlling the conductivity within an acceptable range, protecting the insulation of the generator and saving water resources.

[0004] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical scheme:

[0005] A device for reducing the conductivity of generator cooling water comprises a cooling water pipe installed in a stator coil of a thermal power generator, one end of the water pipe is connected to the water outlet of the stator coil of the thermal power generator, and the other end of the water pipe is connected to the water inlet of the stator coil of the thermal power generator. 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 sequentially arranged on the water pipe along the water flow direction. The first cooler and the second cooler cool the cooling water. After cooling, the cooling water enters the mixing reactor and reacts with the alkali solution inside the mixing reactor to form a precipitate containing copper ions. The first filter device and the second filter device filter the precipitate in the cooling water and then flow it back into the stator coil of the thermal power generator.

[0006] The first cooler, the first water pump and the first filter device are cooperatively arranged on a circulating water pipe. Valves are arranged at both ends of the first cooler, and valves are arranged at both ends of the first filter device.

[0007] The second cooler, the second water pump and the second filter device are cooperatively arranged on another circulating water pipe, valves are arranged at both ends of the second cooler, and valves are arranged at both ends of the second filter device.

[0008] The mixing reactor comprises a cylinder body, a cylinder cover, a first solenoid valve and a first exhaust pipe. The side of the cylinder body is connected to the water inlet end of the water pipe, an observation window is arranged on the side of the cylinder body, a cylinder cover matching with the cylinder body is arranged above the cylinder body, a first solenoid valve is arranged at the bottom of the cylinder body, a water outlet end of the first solenoid valve is connected to the water pipe, a first exhaust pipe is arranged on the cylinder cover, the first exhaust pipe is connected to an external vacuum pump, an air valve is arranged on the first exhaust pipe, and a stirring device is arranged in the cylinder body.

[0009] The stirring device includes a driving motor, an internal gear and a stirring rod. The driving motor is arranged at the upper end of the inner wall of the cylinder body. A driving gear is arranged on the output shaft of the driving motor. An internal gear is arranged below the driving motor. The internal gear is rotatably connected to the inner wall of the cylinder body through a bearing. The driving gear and the internal gear are meshed with each other. Stirring rods are distributed on the lower end surface of the internal gear, and stirring blades are distributed on each stirring rod.

[0010] A sealing ring is arranged at the opening of the cylinder cover and the cylinder body, a second electromagnetic valve is arranged in the middle of the upper surface of the cylinder cover, the second electromagnetic valve is communicated with the cylinder body, and a feeding device is arranged above the second electromagnetic valve.

[0011] The feeding device includes a barrel, a sealing cover and a second exhaust pipe. The lower end of the barrel is connected to the second solenoid valve. A sealing cover matching the barrel is provided above the barrel. A sealing ring is provided at the opening of the sealing cover and the upper end of the barrel. The sealing cover is provided with a second exhaust pipe. The second exhaust pipe is connected to an external vacuum pump and an air valve is provided on the second exhaust pipe.

[0012] A temperature sensor is provided on the water pipe between the first solenoid valve and the electric heater, and the temperature sensor is connected to the electric heater through a signal. A tee is installed on the water pipe at the water outlet of the electric heater, and a first filter device and a second filter device are respectively provided on the water pipes at both water outlets of the tee.

[0013] The first filter device has the same structure as the second filter device. The first filter device includes a sedimentation box and a cover plate. An opening is provided above the sedimentation box. A cover plate matching the opening of the sedimentation box is provided. A sealing ring is provided at the cover plate and the upper opening of the sedimentation box. A third exhaust pipe is provided on the cover plate. The third exhaust pipe is connected to an external vacuum pump. An air valve is provided on the third exhaust pipe. Filter components are distributed in the sedimentation box, and each filter component is arranged in sequence along the water flow direction.

[0014] The filter assembly includes a fixed frame, a filter, a sedimentation shell and a supporting plate. A supporting plate is provided at the lower end of the fixed frame, a filter is provided inside the fixed frame, sedimentation shells are distributed in sequence from top to bottom of the fixed frame toward the direction of water flow, both ends of the sedimentation shells are blocked, each sedimentation shell is provided with a filter, each fixed frame is provided with a limit ring, and longitudinal limit grooves are symmetrically distributed on the inner wall of the limit ring, and the fixed frame is arranged in the corresponding two limit grooves.

[0015] The device for reducing the conductivity of generator cooling water described in the present invention is highly practical and very convenient to use. The cooling water is cooled by a first cooler and a second cooler; a mixing reactor is provided so that copper ions in the cooling water react with alkaline solution therein to form copper ion precipitates, thereby purifying the cooling water; and a first filtering device and a second filtering device are provided so that the copper ion precipitates in the cooling water can be filtered conveniently, the conductivity can be controlled within an acceptable range, the insulation of the generator can be protected, and water resources can be saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0017] Figure 2 is a cross-sectional view of a mixing reactor of the present invention;

[0018] Figure 3 is a cross-sectional view of a first filter device of the present invention;

[0019] In the figure: 1. thermal power generator; 2. water pipe; 3. valve; 4. first cooler; 5. second cooler; 6. first water pump; 7. second water pump; 8. barrel; 9. observation window; 10. electric heater; 11. first filter device; 12. second filter device; 13. barrel cover; 14. first solenoid valve; 15. drive motor; 16. drive gear; 17. internal gear; 18. bearing; 19. stirring rod; 20. stirring blade; 21. first exhaust pipe; 22. barrel; 23. sealing cover; 24. second solenoid valve; 25. second exhaust pipe; 26. sedimentation box; 27. cover plate; 28. third exhaust pipe; 29. ​​fixing frame; 30. filter screen; 31. bearing plate; 32. sedimentation shell; 33. limit ring; 34. limit groove. DETAILED DESCRIPTION

[0020] The present invention can be explained in detail by the following examples, and the purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0021] Combined with Figures 1 to 3A device for reducing the conductivity of generator cooling water comprises a cooling water pipe 2 installed in a stator coil of a thermal generator 1, one end of the water pipe 2 is connected to the water outlet of the stator coil of the thermal generator 1, and the other end of the water pipe 2 is connected to the water inlet of the stator coil of the thermal generator 1. 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 sequentially arranged on the water pipe 2 along the water flow direction. The first cooler 4 and the second cooler 5 cool down the cooling water. After cooling, the cooling water enters the mixing reactor and reacts with the alkali solution inside the mixing reactor to form a precipitate containing copper ions. The first filter device 11 and the second filter device filter the precipitate in the cooling water and then flow it back into the stator coil of the thermal generator 1.

[0022] The first cooler 4 , the first water pump 6 and the first filter device 11 are cooperatively arranged on a circulating water pipe 2 . Valves 3 are provided at both ends of the first cooler 4 , and valves 3 are provided at both ends of the first filter device 11 .

[0023] The second cooler 5 , the second water pump 7 and the second filter device 12 are cooperatively arranged on another circulating water pipe 2 . Valves 3 are provided at both ends of the second cooler 5 , and valves 3 are provided at both ends of the second filter device 12 .

[0024] The mixing reactor includes a barrel 8, a barrel cover 13, a first solenoid valve 14 and a first exhaust pipe 21. The side of the barrel 8 is connected to the water inlet end of the water pipe 2. An observation window 9 is provided on the side of the barrel 8. A barrel cover 13 matching the barrel 8 is provided above the barrel 8. A first solenoid valve 14 is provided at the bottom of the barrel 8. The water outlet end of the first solenoid valve 14 is connected to the water pipe 2. A first exhaust pipe 21 is provided on the barrel cover 13. The first exhaust pipe 21 is connected to an external vacuum pump. An air valve is provided on the first exhaust pipe 21. The external vacuum pump evacuates the air in the barrel 8 through the first exhaust pipe 21 to prevent carbon dioxide from mixing into the cooling water circulation system. A stirring device is provided in the barrel 8.

[0025] The stirring device includes a driving motor 15, an internal gear 17 and a stirring rod 19. The driving motor 15 is arranged at the upper end of the inner wall of the barrel 8. A driving gear 16 is arranged on the output shaft of the driving motor 15. An internal gear 17 is arranged below the driving motor 15. The internal gear 17 is rotatably connected to the inner wall of the barrel 8 through a bearing 18. The driving gear 16 and the internal gear 17 are meshed with each other. Stirring rods 19 are distributed on the lower end surface of the internal gear 17. Stirring blades 20 are distributed on each stirring rod 19. The rotation of the driving motor 15 causes the driving gear 16 to drive the internal gear 17 to rotate, thereby driving the stirring rod 19 to rotate so that the cold water containing copper ions fully reacts with the alkali solution, thereby improving the purification quality of the cold water.

[0026] A sealing ring is provided at the opening between the cylinder cover 13 and the cylinder body 8, a second electromagnetic valve 24 is provided in the middle of the upper surface of the cylinder cover 13, the second electromagnetic valve 24 is connected to the cylinder body 8, a feeding device is provided above the second electromagnetic valve 24, and the alkali solution is stored in the feeding device.

[0027] The feeding device includes a barrel 22, a sealing cover 23 and a second exhaust pipe 25. The lower end of the barrel 22 is connected to the second solenoid valve 24. A sealing cover 23 matching with the barrel 22 is provided above the barrel 22. Sealing rings are provided at the openings of the sealing cover 23 and the upper ends of the barrel 22. A second exhaust pipe 25 is provided on the sealing cover 23. The second exhaust pipe 25 is connected to an external vacuum pump. An air valve is provided on the second exhaust pipe 25. The external vacuum pump evacuates the air in the barrel 22 through the second exhaust pipe 25 to prevent carbon dioxide from mixing into the cooling water circulation system. A stirring device is provided in the barrel body 8.

[0028] A temperature sensor is provided on the water pipe 2 between the first solenoid valve 14 and the electric heater 10, and the temperature sensor is connected to the electric heater 10 through a signal. A tee is installed on the water pipe 2 at the water outlet of the electric heater 10, and a first filter device 11 and a second filter device 12 are respectively provided on the water pipes 2 at both water outlet ends of the tee.

[0029] The first filter device 11 has the same structure as the second filter device 12. The first filter device 11 includes a sedimentation box 26 and a cover plate 27. An opening is provided above the sedimentation box 26. The opening of the sedimentation box 26 is provided with a cover plate 27 that matches it. The cover plate 27 and the upper opening of the sedimentation box 26 are provided with sealing rings. A third exhaust pipe 28 is provided on the cover plate 27. The third exhaust pipe 28 is connected to an external vacuum pump. An air valve is provided on the third exhaust pipe 28. The external vacuum pump evacuates the air in the sedimentation box 26 through the third exhaust pipe 28 to prevent carbon dioxide from mixing into the cooling water circulation system. A stirring device is provided in the barrel 8. Filter components are distributed in the sedimentation box 26. The filter components are arranged in sequence along the water flow direction.

[0030] The filter assembly includes a fixed frame 29, a filter screen 30, a deposition shell 32 and a carrying plate 31. The lower end of the fixed frame 29 is provided with a carrying plate 31, and the fixed frame 29 is provided with a filter screen 30. The fixed frame 29 is provided with deposition shells 32 from top to bottom in the direction of the water flow. Both ends of the deposition shells 32 are blocked, and each deposition shell 32 is provided with a filter screen 30. The water flow impacts the filter screen 30 of the fixed frame 29, and the filter screen 30 filters the copper ion precipitate. The precipitate falls from the filter screen 30 and enters each deposition shell 32 on the side of the fixed frame 29, which facilitates the collection of the copper ion precipitate while facilitating the passage of water flow, and facilitates the later removal of the filter assembly for cleaning. Each fixed frame 29 is provided with a limit ring 33, and the inner wall of the limit ring 33 is symmetrically distributed with longitudinally arranged limit grooves 34. The fixed frame 29 is arranged in the corresponding two limit grooves 34. The limit ring 33 prevents the fixed frame 29 from being displaced or tipped over when impacted, thereby improving the quality of filtration.

[0031] The device for reducing the conductivity of the generator cooling water described in the embodiment, when in use, uses an external vacuum pump to empty the air in the barrel 8 through the first exhaust pipe 21, uses an external vacuum pump to empty the air in the sedimentation box 26 through the third exhaust pipe 28, and then injects alkali solution into the barrel 22. After covering the sealing cover 23, the external vacuum pump empties the air in the barrel 22 through the second exhaust pipe 25 to prevent carbon dioxide from mixing into the cooling water circulation system. By opening the valve 3, the cooling water enters the first cooler 4 and the second cooler 5 through the water pipe 2. The first cooler 4 and the second cooler 5 cool the cooling water. The first water pump 6 and the second water pump 7 inject the cooled cooling water into the mixing reactor. The second solenoid valve 24 is opened, and the alkali solution falls into the barrel 8. The driving motor 15 rotates so that the driving gear 16 drives the internal gear 17 to rotate, thereby driving the stirring rod 19 to rotate so that the cooling water containing copper ions fully reacts with the alkali solution, thereby improving the purification quality of the cooling water. A solenoid valve 14 is provided. The purified cooling water carries the copper ion precipitate and moves into the electric heater 10. The temperature sensor on the water pipe 2 between the first solenoid valve 14 and the electric heater 10 detects the temperature of the cooling water. If the temperature is lower than the limit value, the electric heater 10 heats the cooling water to control the conductivity within the qualified range. Then the cooling water enters the first filter device 11 and the second filter device 12 respectively. The water flow impacts the filter screen 30 of the fixed frame 29. The filter screen 30 filters the copper ion precipitate. The precipitate falls from the filter screen 30 and enters each deposition shell 32 on the side of the fixed frame 29. It is convenient for the water flow to pass through and collect the copper ion precipitate, so as to facilitate the later removal of the filter assembly for cleaning. The limit ring 33 prevents the fixed frame 29 from being displaced or tipped over when impacted, thereby improving the quality of filtration. The filtered cooling water enters the water inlet end of the stator coil of the thermal generator 1 through the water pipe 2, completing the cycle while protecting the generator insulation and saving water resources.

[0032] The parts of the present invention that are not described in detail are prior art. Although the present invention is specifically demonstrated and introduced in conjunction with the preferred implementation scheme, there are many methods and approaches to specifically implement the technical solution. The above is only a preferred implementation scheme of the present invention, but technical personnel in the relevant field should understand that various changes can be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined in the attached claims, and all of them are within the scope of protection of the present invention.

Claims

1. A device for reducing the conductivity of cooling water of a generator, comprising a cooling water pipe (2) installed on the stator coil of a thermal generator (1), one end of the pipe (2) being connected to the water outlet of the stator coil of the thermal generator (1), and the other end of the pipe (2) being connected to the water inlet of the stator coil of the thermal 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 sequentially arranged on the water pipe (2) along the water flow direction. The first cooler (4) and the second cooler (5) cool down the cooling water. After cooling, the cooling water enters the mixing reactor and reacts with the alkaline solution inside the mixing reactor to form a precipitate containing copper ions. The first filter device (11) and the second filter device filter the precipitate in the cooling water (12) and then return it to the stator coil of the thermal power generator (1).

2. The device for reducing the conductivity of cooling water of a generator according to claim 1, characterized in that: The first cooler (4), the first water pump (6) and the first filter device (11) are cooperatively arranged on a circulating water pipe (2); valves (3) are provided at both ends of the first cooler (4); and valves (3) are provided at both ends of the first filter device (11).

3. The device for reducing the conductivity of cooling water of a generator according to claim 1, characterized in that: The second cooler (5), the second water pump (7) and the second filter device (12) are cooperatively arranged on another circulating water pipe (2); valves (3) are provided at both ends of the second cooler (5); and valves (3) are provided at both ends of the second filter device (12).

4. The device for reducing the conductivity of cooling water of a generator according to claim 1, characterized in that: The mixing reactor comprises a barrel (8), a barrel cover (13), a first electromagnetic valve (14) and a first exhaust pipe (21); the side of the barrel (8) is connected to the water inlet end of the water pipe (2); an observation window (9) is provided on the side of the barrel (8); a barrel cover (13) matched with the barrel (8) is provided above the barrel (8); a first electromagnetic valve (14) is provided at the bottom of the barrel (8); a water outlet end of the first electromagnetic valve (14) is connected to the water pipe (2); a first exhaust pipe (21) is provided on the barrel cover (13); the first exhaust pipe (21) is connected to an external air pump; an air valve is provided on the first exhaust pipe (21); and a stirring device is provided inside the barrel (8).

5. The device for reducing the conductivity of cooling water of a generator according to claim 4, characterized in that: The stirring device comprises a driving motor (15), an internal gear (17) and a stirring rod (19); the driving motor (15) is arranged at the upper end of the inner wall of the barrel (8); a driving gear (16) is arranged on the output shaft of the driving motor (15); an internal gear (17) is arranged below the driving motor (15); the internal gear (17) is rotatably connected to the inner wall of the barrel (8) through a bearing (18); the driving gear (16) and the internal gear (17) are meshed with each other; stirring rods (19) are distributed on the lower end surface of the internal gear (17); and stirring blades (20) are distributed on each stirring rod (19).

6. The device for reducing the conductivity of cooling water of a generator according to claim 4, characterized in that: A sealing ring is provided at the opening between the cylinder cover (13) and the cylinder body (8), a second electromagnetic valve (24) is provided in the middle of the upper surface of the cylinder cover (13), the second electromagnetic valve (24) is connected to the cylinder body (8), and a feeding device is provided above the second electromagnetic valve (24).

7. The device for reducing the conductivity of cooling water of a generator according to claim 6, characterized in that: The feeding device comprises a barrel (22), a sealing cover (23) and a second exhaust pipe (25); the lower end of the barrel (22) is connected to the second solenoid valve (24); a sealing cover (23) matching with the barrel (22) is provided above the barrel (22); a sealing ring is provided at the opening of the sealing cover (23) and the upper end of the barrel (22); a second exhaust pipe (25) is provided on the sealing cover (23); the second exhaust pipe (25) is connected to an external vacuum pump; and an air valve is provided on the second exhaust pipe (25).

8. The device for reducing the conductivity of cooling water of a generator according to claim 4, characterized in that: A temperature sensor is provided on the water pipe (2) between the first solenoid valve (14) and the electric heater (10), and the temperature sensor is connected to the electric heater (10) via a signal. A tee is installed on the water pipe (2) at the water outlet of the electric heater (10), and a first filter device (11) and a second filter device (12) are respectively provided on the water pipes (2) at the two water outlet ends of the tee.

9. The device for reducing the conductivity of cooling water of a generator according to claim 8, characterized in 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 cover plate (27). An opening is provided above the sedimentation box (26). A cover plate (27) matching with the sedimentation box (26) is provided at the opening of the sedimentation box (26). A sealing ring is provided at the cover plate (27) and the upper opening of the sedimentation box (26). A third exhaust pipe (28) is provided on the cover plate (27). The third exhaust pipe (28) is connected to an external air pump. An air valve is provided on the third exhaust pipe (28). Filter components are distributed in the sedimentation box (26). The filter components are arranged in sequence along the water flow direction.

10. The device for reducing the conductivity of cooling water of a generator according to claim 9, characterized in that: The filter assembly comprises a fixed frame (29), a filter screen (30), a sedimentation shell (32) and a bearing plate (31); a bearing plate (31) is provided at the lower end of the fixed frame (29); a filter screen (30) is provided inside the fixed frame (29); sedimentation shells (32) are distributed in sequence from top to bottom of the fixed frame (29) in the direction of the water flow; both ends of the sedimentation shells (32) are blocked; each sedimentation shell (32) is provided with a filter screen (30); each fixed frame (29) is provided with a limit ring (33); the inner wall of the limit ring (33) is symmetrically distributed with longitudinally arranged limit grooves (34); the fixed frame (29) is arranged in the corresponding two limit grooves (34).

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