Stator bar jumper wire evaporative cooling system of giant water-turbine generator set

Abstract

The invention discloses a stator bar jumper wire evaporative cooling system of a giant water-turbine generator set, and relates to the technical field of water-turbine generators. The invention aims to solve the problems that the cooling difficulty is relatively high and potential safety hazards exist in the operation of the jumper wire due to the adoption of an air and external cooling mode in the conventional jumper wire. The device comprises a condenser, a steam collecting pipe, a jumper wire, stator bars and a liquid collecting pipe which are sequentially arranged from top to bottom, the condenser is communicated with the liquid collecting pipe through a liquid return pipe, the steam collecting pipe is communicated with the condenser through a steam outlet pipe, and the bottom ends of cooling pipelines of the stator bars are communicated with the liquid collecting pipe. The top ends of the cooling pipelines of at most two stator bars in each cooling unit are communicated with the steam collecting pipe through jumper wires, and the jumper wires are connected with the stator bars in series, so that the cooling mode of the stator bars and the jumper wires is evaporative cooling, the evaporative cooling can cool the jumper wires from the inside without being influenced by a surface insulating layer, and the cooling efficiency is improved. And the cooling effect is better, so that the safe operation of the jumper wire is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of hydro-generators, and in particular to an evaporative cooling system for stator wire rod jumpers of a giant hydro-generator set. Background Art

[0002] Currently, there are three cooling methods for large turbines, namely, full air cooling, evaporative cooling, and water-cooling. Evaporative cooling, which is also a direct cooling method, is more popular than water-cooling because of its safety and reliability.

[0003] Giant hydro-turbine generator sets include stator bars and jumper wires. The jumper wires are used to connect between the stator bars. Both the stator bars and the jumper wires need to be cooled when in use. Currently, only the stator bars use evaporative cooling, while the jumper wires use air cooling. The air is applied to the insulating layer on the surface of the jumper wire to cool the jumper wire. However, the insulating layer will increase the temperature difference, resulting in an increase in temperature, making cooling more difficult. There are safety hazards when the jumper wires are in operation.

[0004] In summary, the existing jumper cables adopt an air-cooling method, which makes cooling difficult and poses a potential safety hazard during operation. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that the existing jumper wire adopts air external cooling, which is difficult to cool and has potential safety hazards during operation. Further, an evaporative cooling system for the stator bar jumper wire of a giant hydro-turbine generator set is provided.

[0006] The technical scheme of the present invention is: a giant hydro-turbine generator stator bar jumper wire evaporative cooling system, comprising: a condenser, a steam collecting pipe, a jumper wire, a stator bar and a liquid collecting pipe arranged in sequence from top to bottom, the condenser is connected to the liquid collecting pipe through a liquid return pipe, the steam collecting pipe is connected to the condenser through a steam outlet pipe, the stator bar has a plurality of stator bars arranged side by side, the top ends of the cooling pipelines of the plurality of stator bars are connected to the steam collecting pipe, and the bottom ends of the cooling pipelines of the plurality of stator bars are connected to the liquid collecting pipe;

[0007] A cooling unit is formed by a plurality of the stator bars and a jumper wire, and top ends of cooling pipes of at most two of the stator bars in each cooling unit are connected to the steam collecting pipe through the jumper wire.

[0008] Furthermore, one end of the cooling pipeline of the jumper wire is communicated with the cooling pipeline of one of the stator bars, and the other end of the cooling pipeline of the jumper wire is communicated with the steam collecting pipe.

[0009] Furthermore, two ends of the cooling pipeline of the jumper wire are respectively connected to the cooling pipelines of the two stator bars, and the middle part of the cooling pipeline of the jumper wire is connected to the steam collecting pipe through a liquid inlet pipe.

[0010] Furthermore, the liquid return pipe is connected to a liquid level meter extending vertically upward.

[0011] Furthermore, it also includes: a pressure detection component installed in the condenser, and the pressure detection component is used to measure the internal pressure of the condenser.

[0012] Furthermore, the pressure detection component is a pressure sensor.

[0013] Furthermore, the liquid return pipe is provided with a connection port for flushing or draining liquid.

[0014] Furthermore, it also includes: a temperature detection component installed between the layers of the stator wire bar, and the temperature detection component is used to measure the temperature of the stator wire bar.

[0015] Furthermore, the temperature detection component is a temperature sensor.

[0016] Compared with the prior art, the present invention has the following effects:

[0017] 1. The giant hydro-turbine generator set stator bar jumper wire evaporative cooling system provided by the present invention connects the jumper wire and the stator bar in series to form an evaporative cooling method. The evaporative cooling can cool the jumper wire from the inside without being affected by the surface insulation layer, and the cooling effect is better, thereby ensuring the safe operation of the jumper wire.

[0018] 2. The giant hydro-turbine generator set stator bar jumper wire evaporative cooling system provided by the present invention heats up the cooling medium in the stator bar and evaporates to form a vapor-liquid two-phase flow, which rises under the liquid column pressure of the return pipe, then enters the steam collecting pipe, and then reaches the condenser through the steam outlet pipe, completing a cooling cycle. The entire cycle process does not require the help of a power source, has lower energy consumption, and thus reduces the cost of use.

[0019] 3. The stator bar jumper wire evaporative cooling system of the giant hydro-generator set provided by the present invention can display the height of the cooling medium in the return pipe in real time by the liquid level meter, so that the staff can add the cooling medium according to the actual situation and make the subsequent maintenance work more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of a first embodiment of the stator bar jumper evaporative cooling system of a giant hydro-generator set of the present invention;

[0021] Figure 2 yes Figure 1 Side view of

[0022] Figure 3 It is a schematic diagram of the overall structure of a second embodiment of the giant hydro-generator stator bar jumper wire evaporative cooling system of the present invention.

[0023] In the figure: 1. condenser; 2. steam collecting pipe; 3. jumper wire; 4. stator wire rod; 5. liquid collecting pipe; 6. liquid return pipe; 7. steam outlet pipe; 8. liquid level gauge; 9. pressure detection component; 10. connection port; 11. temperature detection component; 12. liquid joint; 13. liquid inlet pipe; 14. adapter. DETAILED DESCRIPTION

[0024] Specific implementation method 1: Combination Figures 1 to 3 The present embodiment is described. The present embodiment includes a condenser 1, a steam collecting pipe 2, a jumper line 3, a stator wire rod 4 and a liquid collecting pipe 5 which are arranged in sequence from top to bottom. The condenser 1 is connected to the liquid collecting pipe 5 through a liquid return pipe 6. The steam collecting pipe 2 and the liquid collecting pipe 5 are arranged horizontally. The liquid return pipe 6 is L-shaped. The steam collecting pipe 2 is connected to the condenser 1 through a steam outlet pipe 7. The stator wire rod 4 has a hollow channel inside. The cooling medium flows in the hollow channel. The stator wire rod 4 has a plurality of stator wire rods arranged side by side. The top ends of the cooling pipes of the plurality of stator wire rods 4 are connected to a liquid joint 12. The liquid joint 12 is connected to the liquid joint 12. A liquid inlet pipe 13 is connected to the steam collecting pipe 2, and the bottom ends of the cooling pipelines of the multiple stator wire rods 4 are connected to the liquid collecting pipe 5, and are also connected to the liquid collecting pipe 5 by means of a liquid joint 12 and a liquid inlet pipe 13, wherein a cooling unit is formed by multiple stator wire rods 4 and a jumper wire 3, and there are multiple cooling units. The top ends of the cooling pipelines of at most two stator wire rods 4 in each cooling unit are connected to the steam collecting pipe 2 through the jumper wire 3, and the jumper wire 3 and the stator wire rod 4 are connected in series, and the jumper wire 3 also has a hollow channel inside to allow the cooling medium to flow.

[0025] The giant hydro-turbine generator set stator bar jumper wire evaporative cooling system of this embodiment connects the jumper wire 3 and the stator bar 4 in series, so that the stator bar 4 and the jumper wire 3 form an evaporative cooling mode together. The evaporative cooling can cool the jumper wire 3 from the inside without being affected by the surface insulation layer, and the cooling effect is better, thereby ensuring the safe operation of the jumper wire 3.

[0026] Specific implementation method 2: Combination Figure 1 This embodiment is described. One end of the cooling pipeline of the jumper wire 3 of this embodiment is connected to the cooling pipeline of one of the stator bars 4 through the adapter 14, and the other end of the cooling pipeline of the jumper wire 3 is connected to the steam collecting pipe 2 through the liquid joint 12 and the liquid guide pipe 13. When the length of the jumper wire 3 is short, the above arrangement can be adopted to ensure the flow speed of the cooling medium in the stator bar 4 and ensure the cooling effect. Other components and connection relationships are the same as those of the first embodiment.

[0027] Specific implementation method three: Combination Figure 3 This embodiment is described. The two ends of the cooling pipeline of the jumper wire 3 of this embodiment are respectively connected to the cooling pipelines of the two stator bars 4 through the adapter 14, and the middle part of the jumper wire 3 is connected to the steam collecting pipe 2 through two liquid guide pipes 13. When the jumper wire 3 is long, the above arrangement can be adopted, and the flow distance of the cooling medium in the jumper wire 3 is shorter, thereby ensuring the flow speed of the cooling medium in the stator bar 4 and ensuring the cooling effect. Other components and connection relationships are the same as those of the first embodiment.

[0028] Specific implementation method four: Combination Figure 2 To explain this embodiment, the return pipe 6 of this embodiment is connected to a liquid level gauge 8 extending vertically upward, and the liquid level gauge 8 is parallel to the return pipe 6. The liquid level gauge 8 can display the height of the cooling medium in the return pipe 6 in real time, so that the staff can add the cooling medium according to the actual situation, making the subsequent maintenance work more convenient. The other components and connection relationships are the same as those of the specific embodiment 1.

[0029] Specific implementation method five: Combination Figure 1 , Figure 3 This embodiment further includes: a pressure detection member 9 installed in the condenser 1, and used to measure the internal pressure of the condenser 1. When the internal pressure of the condenser 1 is too high, it can promptly remind the staff and reduce the safety hazard of the system. Other components and connection relationships are the same as those of the first embodiment.

[0030] Specific implementation method six: Combination Figure 1 , Figure 3 To explain this embodiment, the pressure detection component 9 of this embodiment uses a pressure sensor. The pressure sensor is small in size, easy to install, and has a sturdy design. It can operate normally in a harsh working environment and provide reliable data. Of course, the above description is not restrictive. As an alternative embodiment, the pressure detection component 9 can also use a pressure transmitter, a pressure switch, etc. The other components and connection relationships are the same as those of the specific embodiment five.

[0031] Specific implementation method seven: Combination Figure 2 To explain this embodiment, the return pipe 6 of this embodiment is provided with a connection port 10 for flushing or draining liquid, and the connection port 10 is in a closed state when in use. When it is necessary to add coolant or drain coolant, the connection port 10 is opened, and the cooling medium inside the cooling system can be adjusted through the connection port 10, thereby flexibly adjusting the cooling efficiency. Other components and connection relationships are the same as those of the first embodiment.

[0032] Specific implementation method eight: Combination Figure 1 , Figure 3This embodiment is described, and this embodiment further includes: a temperature detection member 11, which is installed between the layers of the stator wire bar 4, and the temperature detection member 11 is used to measure the temperature of the stator wire bar 4. When the temperature of the stator wire bar 4 is too high, it can timely remind the staff, which can play the role of alarm and reduce safety hazards. Other components and connection relationships are the same as any one of the specific embodiments 1 to 7.

[0033] Specific implementation method nine: Combination Figure 1 , Figure 3 To explain this embodiment, the temperature detection member 11 of this embodiment uses a temperature sensor, which can maintain stable performance during long-term use and is not easily affected by environmental factors. Of course, the above description is not restrictive. As an alternative embodiment, the temperature detection member 11 can also use a thermistor, etc. The other components and connection relationships are the same as those of the specific embodiment eight.

[0034] Working principle of this implementation:

[0035] After the vapor evaporative cooling medium is condensed into liquid in the condenser 1, it enters the liquid collecting pipe 5 through the liquid return pipe 6, and then enters the stator wire rods 4 with hollow flow channels through the liquid introduction pipe 13 and the liquid joint 12 respectively. The liquid evaporative cooling medium heats up and evaporates in the stator wire rods 4 to form a vapor-liquid two-phase flow, rises under the liquid column pressure of the liquid return pipe 6, enters the steam collecting pipe 2 through the liquid joint 12 and the liquid introduction pipe 13, and then reaches the condenser 1 through the steam outlet pipe 7, thereby completing a cooling cycle.

[0036] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A giant hydro-turbine generator stator bar jumper wire evaporative cooling system, comprising: A condenser (1), a steam collecting pipe (2), a jumper wire (3), a stator wire rod (4) and a liquid collecting pipe (5) are arranged in sequence from top to bottom, the condenser (1) is connected to the liquid collecting pipe (5) via a liquid return pipe (6), the steam collecting pipe (2) is connected to the condenser (1) via a steam outlet pipe (7), a plurality of stator wire rods (4) are arranged side by side, the top ends of the cooling pipes of the plurality of stator wire rods (4) are connected to the steam collecting pipe (2), and the bottom ends of the cooling pipes of the plurality of stator wire rods (4) are connected to the liquid collecting pipe (5); It is characterized in that a cooling unit is formed by a plurality of the stator bars (4) and one jumper wire (3), and the top ends of the cooling pipes of at most two of the stator bars (4) in each cooling unit are connected to the steam collecting pipe (2) through the jumper wire (3).

2. The giant hydro-generator stator bar jumper wire evaporative cooling system according to claim 1 is characterized in that: One end of the cooling pipeline of the jumper wire (3) is connected to the cooling pipeline of one of the stator bars (4), and the other end of the cooling pipeline of the jumper wire (3) is connected to the steam collecting pipe (2).

3. The giant hydro-generator stator bar jumper wire evaporative cooling system according to claim 1 is characterized in that: The two ends of the cooling pipeline of the jumper wire (3) are respectively connected to the cooling pipelines of the two stator bars (4), and the middle part of the cooling pipeline of the jumper wire (3) is connected to the steam collecting pipe (2) through a liquid inlet pipe (13).

4. The giant hydro-generator stator bar jumper wire evaporative cooling system according to claim 1, characterized in that: The liquid return pipe (6) is connected to a liquid level meter (8) extending vertically upward.

5. The giant hydro-generator stator bar jumper wire evaporative cooling system according to claim 1, characterized in that: Also includes: A pressure detection component (9) is installed in the condenser (1), and the pressure detection component (9) is used to measure the internal pressure of the condenser (1).

6. The giant hydro-generator stator bar jumper wire evaporative cooling system according to claim 5, characterized in that: The pressure detection component (9) is a pressure sensor.

7. The giant hydro-generator stator bar jumper wire evaporative cooling system according to claim 1, characterized in that: The liquid return pipe (6) is provided with a connection port (10) for flushing or draining liquid.

8. A giant hydro-generator stator bar jumper wire evaporative cooling system according to any one of claims 1 to 7, characterized in that: Also includes: A temperature detection element (11) is installed between layers of the stator wire bar (4), and the temperature detection element (11) is used to measure the temperature of the stator wire bar (4).

9. The giant hydro-generator stator bar jumper wire evaporative cooling system according to claim 8, characterized in that: The temperature detection component (11) is a temperature sensor.

Images