CN114017445A - Cooling system and method for thrust bearing of hydroelectric generating set - Google Patents
Cooling system and method for thrust bearing of hydroelectric generating set Download PDFInfo
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- CN114017445A CN114017445A CN202111166149.3A CN202111166149A CN114017445A CN 114017445 A CN114017445 A CN 114017445A CN 202111166149 A CN202111166149 A CN 202111166149A CN 114017445 A CN114017445 A CN 114017445A
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- oil
- cooler
- cooling
- stop valve
- thrust bearing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B11/00—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator
- F03B11/06—Bearing arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C37/00—Cooling of bearings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The invention discloses a system and a method for cooling a thrust bearing of a hydroelectric generating set, wherein the system comprises a cooling loop I and a plurality of cooling loops II; the cooling loop I comprises a mirror plate pump, an oil collecting tank, a first cooler oil inlet pipe, a first cooler and a first cooler oil outlet pipe; the cooling circuit II comprises a second cooler oil inlet pipe, a second cooler and a second cooler oil outlet pipe; an oil collecting tank is arranged at the position of the oil scraping plate, the oil collecting tank is communicated with an inlet of a second cooler through an oil inlet pipe of the second cooler, and an oil pump is mounted on the oil inlet pipe of the second cooler; the outlet of the second cooler is communicated with the oil outlet pipe of the first cooler through the oil outlet pipe of the second cooler. When the unit works, the cooling loop I acts first, and when the monitored oil temperature exceeds a set critical value along with the temperature rise of the tile and the lubricating oil, the cooling loop II starts to work, so that the cooling efficiency is greatly improved, and the reliability of cooling the lubricating oil is improved.
Description
Technical Field
The invention belongs to the technical field of hydroelectric generating set equipment, and particularly relates to a hydroelectric generating set thrust bearing cooling system and method.
Background
The thrust bearing of the water turbine generator set is one of the most important parts of the water turbine generator set, bears the axial loads such as the rotor quality of the generator set, the axial water thrust and the like, and the working performance of the thrust bearing not only influences the output and the efficiency of the set, but also directly relates to whether the set can run safely. Thrust bearing is under complicated operating mode, the problem that thrust bearing tile temperature is high appears easily, and thrust bearing tile high temperature can take place to jump machine even the event of burning tiles, consequently need cool off and filter through the lubricating oil to thrust bearing to reduce the tile temperature, improve thrust bearing operational environment.
Fig. 1 is a schematic diagram of a thrust bearing cooling system of a common hydroelectric generating set. The thrust bearing cooling system is formed by a mirror plate pump 1 ', an oil collecting groove 2', a seal 3 ', a filter 4', a temperature sensor 5 ', a pressure sensor, a pressure gauge 6', a cooler 7 'and an oil injection pipe 8', wherein the mirror plate pump 1 'is formed by processing a plurality of radial holes by using a bearing rotating part, when a unit runs, the oil collecting groove 2' is arranged on the outer side of the rotating body, oil pumped by the pump is collected into a system oil pipe, the oil is cooled by the filter 4 'after the oil temperature and the pressure are detected by the temperature sensor 5', the pressure sensor and the pressure gauge 6 ', and the oil is sprayed to the vicinity of an oil inlet edge of a tile along a ring pipe and the oil injection pipe 8' after being cooled.
But this cooling system receives influences such as oil groove structure, lubricating oil viscidity at the during operation, and the cooling effect is not good enough, especially when the oil temperature is higher, and cooling efficiency is not high to lead to thrust bearing tile temperature to be on the high side, influenced the safety and stability operation of unit.
Disclosure of Invention
The invention aims to provide a cooling system and a cooling method for a thrust bearing of a water turbine generator set, and solves the technical problems that in the prior art, the bearing cooling system is influenced by the structure of an oil groove, the viscosity of lubricating oil and the like during working, the cooling effect is poor, and particularly, when the oil temperature is high, the cooling efficiency is not high, so that the temperature of a thrust bearing bush is high, and the safe and stable operation of the set is influenced.
In order to solve the technical problems, the invention adopts the following technical scheme:
a cooling system for a thrust bearing of a hydroelectric generating set comprises a cooling loop I and a plurality of cooling loops II;
the cooling loop I comprises a mirror plate pump, an oil collecting tank, a first cooler oil inlet pipe, a first cooler and a first cooler oil outlet pipe, the mirror plate pump is connected with the oil collecting tank in a sealing mode, the oil collecting tank is communicated with an inlet of the first cooler through the first cooler oil inlet pipe, and an outlet of the first cooler is communicated with an oil injection pipe of the thrust bearing through the first cooler oil outlet pipe;
the cooling circuit II comprises a second cooler oil inlet pipe, a second cooler and a second cooler oil outlet pipe; an oil collecting tank is arranged at the position of the oil scraping plate, the oil collecting tank is communicated with an inlet of a second cooler through an oil inlet pipe of the second cooler, and an oil pump is mounted on the oil inlet pipe of the second cooler; the outlet of the second cooler is communicated with the oil outlet pipe of the first cooler through the oil outlet pipe of the second cooler.
According to the invention, by arranging the cooling loop I and the cooling loop II, when the unit is in various working conditions, a temperature critical value can be set according to the monitored temperature of the lubricating oil. When the unit works, the cooling loop I acts first, and as the temperature of the tile and the temperature of the lubricating oil rise, when the monitored oil temperature exceeds a set critical value, the oil scraping plate starts to work, and the cooling loop II also starts to work, so that the cooling efficiency is greatly submitted, and the reliability of cooling the lubricating oil is improved. When the unit works, the two cooling loops can be mutually standby, so that the unit can adapt to different working conditions.
Because the lubricating oil is easy to degrade under the action of high temperature and centrifugal force, a filter is added in the cooling loop to ensure the lubricating quality of the subsequent lubricating oil, thereby improving the lubricating quality.
Further optimize, install filter, first temperature sensor and first pressure sensor on the oil inlet pipe of first oil cooler.
And further optimizing, wherein a second temperature sensor and a second pressure sensor are arranged on the oil inlet pipe of the second cooler.
The oil inlet pipe of the first cooler is communicated with the oil inlet pipe of the second cooler through an oil conveying pipe, the oil conveying pipe is provided with a first stop valve, and the oil outlet pipe of the second oil cooler is provided with a second stop valve; and a third stop valve is arranged on the oil inlet pipe of the first oil cooler, and the mounting position of the third stop valve is positioned between the first cooler and the communication point of the oil inlet pipe of the first cooler and the oil delivery pipe.
Further optimization, a buckle pulling plate is arranged in the filter.
Further optimizing, the oil outlet pipe of the first cooler is a ring pipe, and all the oil outlet pipes of the second cooler are communicated with the ring pipe.
Further optimizing, the ventilator is installed in the foundation pit where the thrust bearing of the unit is located. The air in the foundation pit is exchanged with the air outside, so that the cooling effect is further improved.
Further optimizing, cooling circuit I and cooling circuit II are outer circulation circuit, and first cooler and second cooler are installed outside the oil trap. When the thrust bearing is overhauled, the cooler does not need to be dismantled when the thrust pad is dismantled, and the thrust bearing is convenient to overhaul.
According to the cooling method based on the thrust bearing cooling system of the water turbine generator set, the first stop valve, the second stop valve and the third stop valve are all electromagnetic valves, and the first temperature sensor, the first pressure sensor, the first cooler, the second temperature sensor, the second pressure sensor, the oil pump, the second cooler, the first stop valve, the second stop valve and the third stop valve are all electrically connected with the controller;
setting a temperature threshold in the controller; when the pumped storage unit starts to operate, the cooling circuit I starts to operate, the cooling circuit II does not operate, the first stop valve and the second stop valve are both closed at the moment, and the stop valves are opened;
the method comprises the steps that along with the increase of the operation time of a pumped storage unit, the thrust bearing pad and the oil temperature of the unit gradually rise, when the oil temperature measured by a first temperature sensor on a cooling circuit I is higher than a threshold value, an oil scraping plate is started to start working, a cooling circuit II starts working, and at the moment, a first stop valve, a second stop valve and a third stop valve are all opened.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, by arranging the cooling loop I and the cooling loop II, when the unit is in various working conditions, a temperature critical value can be set according to the monitored temperature of the lubricating oil. When the unit works, the cooling loop I acts first, and as the temperature of the tile and the temperature of the lubricating oil rise, when the monitored oil temperature exceeds a set critical value, the oil scraping plate starts to work, and the cooling loop II also starts to work, so that the cooling efficiency is greatly submitted, and the reliability of cooling the lubricating oil is improved. When the unit works, the two cooling loops can be mutually standby, so that the unit can adapt to different working conditions.
Drawings
FIG. 1 is a schematic view of a cooling system for a thrust bearing of a hydroelectric generating set in the prior art;
FIG. 2 is a schematic view of a cooling system for a thrust bearing of the hydroelectric generating set according to the present invention;
FIG. 3 is a schematic view of the top view arrangement of the cooling system of the thrust bearing of the hydroelectric generating set according to the present invention;
FIG. 4 is a diagram of the result of numerical simulation of the surface temperature of an oil film of a thrust bearing; wherein, FIG. 4(a) is a numerical simulation result diagram of the surface temperature of the bearing oil film when only the cooling circuit I works; FIG. 4(b) is a diagram showing the result of numerical simulation of the surface temperature of the oil film of the bearing when the cooling circuit I and the cooling circuit II work together;
FIG. 5 is a graph comparing the temperature of a pad of a thrust bearing along the radial direction under two cooling modes.
Detailed Description
The following detailed description of embodiments of the present invention will be made with reference to the accompanying drawings and examples.
Fig. 2 and 3 show that the cooling system for the thrust bearing of the water turbine generator set comprises a cooling loop I and six cooling loops II.
The cooling circuit I comprises a mirror plate pump 1, an oil collecting tank 2, a first cooler oil inlet pipe, a first cooler 7 and a first cooler oil outlet pipe, wherein the mirror plate pump 1 in the cooling circuit I is formed by processing a plurality of radial holes by utilizing a bearing rotating part and is used for providing power for the cooling circuit I; the mirror plate pump 1 is connected with the oil collecting tank 2 through a sealing structure 3, and the oil collecting tank 3 is used for collecting hot oil; the oil collecting groove is communicated with an inlet of the first cooler 7 through an oil inlet pipe of the first cooler, and an outlet of the first cooler 7 is communicated with an oil injection pipe 8 of the thrust bearing through an oil outlet pipe of the first cooler; a filter 4, a first temperature sensor 5 and a first pressure sensor 6 are arranged on an oil inlet pipe of the first oil cooler, and an oil outlet pipe of the first oil cooler is a ring pipe.
Hot oil flows through the filter 4 according to the pipeline, and the filter adopts a built-in buckle pulling plate, so that the filter is convenient to clean in time; hot oil enters a first cooler 7 after being monitored by a first temperature sensor 5 and a first pressure sensor 6, is cooled by the first cooler 7 and then is sprayed to the vicinity of the oil inlet edge of the thrust bearing pad by a ring pipe and an oil spraying pipe 8.
The cooling circuit II comprises a second cooler oil inlet pipe, a second cooler 13 and a second cooler oil outlet pipe; an oil collecting tank is arranged at the position of the oil scraping plate, the oil collecting tank is communicated with an inlet of a second cooler 13 through an oil inlet pipe of the second cooler, and an oil pump 12 is installed on the oil inlet pipe of the second cooler; the outlet of the second cooler 13 is in communication with the first cooler outlet through a second cooler outlet. And a second temperature sensor 10 and a second pressure sensor 11 are installed on the oil inlet pipe of the second cooler. The first cooler oil inlet pipe is communicated with the second cooler oil inlet pipe through an oil conveying pipe, a first stop valve 14a is installed on the oil conveying pipe, and a second stop valve 14b is installed on the second oil cooler oil outlet pipe; and a third stop valve 14c is arranged on the oil inlet pipe of the first oil cooler, and the mounting position of the third stop valve 14c is positioned between the first cooler 7 and the communication point of the oil inlet pipe of the first cooler and the oil delivery pipe.
The oil scraping plate is used for collecting hot oil scraped by the oil scraping plate, the oil collecting tank 9 is connected with the cooling loop II, and the temperature of the hot oil is monitored through a second temperature sensor 10 and a second pressure sensor 11; the oil pump 12 provides power support for the cooling circuit II and is connected with a second cooler 13; the second cooler 13 cools the hot oil in the loop, and then the hot oil is sprayed to the position near the oil inlet edge of the tile through a ring pipe and an oil spraying pipe 8.
When the rotating speed of the unit is high and the temperature of the tile is high, in order to prevent hot oil from being carried to the adjacent tiles, an oil scraping plate is arranged between the two tiles. The device adopts two oil scraping plates to share one cooling circuit II, and as shown in figure 3, in the embodiment, 6 cooling circuits II are arranged.
In this embodiment, the ventilator is installed in the foundation pit where the thrust bearing of the unit is located, and the air in the foundation pit is exchanged with the external air in an intersecting manner, so that the cooling effect is further improved.
In the present embodiment, the cooling circuit i and the cooling circuit ii are both external circulation circuits, and the first cooler 7 and the second cooler 13 are installed outside the oil sump. When the thrust bearing is overhauled, the cooler does not need to be dismantled when the thrust pad is dismantled, and the thrust bearing is convenient to overhaul.
According to the cooling method based on the cooling device of the thrust bearing of the water-turbine generator set, the first stop valve 14a, the second stop valve and the third stop valve 14c are all electromagnetic valves, and the first temperature sensor 5, the first pressure sensor 6, the first cooler 7, the second temperature sensor 10, the second pressure sensor 11, the oil pump 12, the second cooler 13, the first stop valve 14a, the second stop valve 14b and the third stop valve 14c are all electrically connected with the controller.
Setting a temperature threshold in the controller; when the pumped storage unit starts to operate, the cooling circuit I starts to operate, the cooling circuit II does not operate, the first stop valve 14a and the second stop valve 14b are both closed, and the stop valve 14c is opened;
along with the increase of the operation time of the pumped storage unit, the thrust bearing pads and the oil temperature of the unit gradually increase, when the oil temperature measured by the first temperature sensor 5 on the cooling circuit I is higher than a threshold value, the oil scraping plate is started to start to work, the cooling circuit II starts to work, and at the moment, the first stop valve 14a, the second stop valve and the third stop valve 14c are all opened.
When the cooling equipment on the unit cooling loop I needs to be overhauled or the cooling liquid needs to be replaced, the cooling circuit II can also be temporarily used as a standby, namely the first stop valve 14a and the second stop valve 14b are opened, the third stop valve 14c is closed, and the hot oil is cooled by the second cooler 14. Therefore, the cooling loop I and the cooling loop II can both form an independent cooling unit, and meanwhile, the cooling requirements of the thrust bearing and the thrust pad of the thrust bearing can be met, and the running stability and the reliability of the water-turbine generator set can be improved.
In order to verify the cooling effect of the cooling system, the numerical simulation is carried out on the oil film on the surface of the thrust bearing, and the temperature conditions of the lubricating oil under the two conditions that only the cooling circuit I works and the cooling circuit I and the cooling circuit II work together are respectively obtained. The method comprises the following steps of performing grid division on a calculation model through an icem, wherein the calculation model is divided into an oil film region and a non-oil film region, the oil film region is divided by adopting a structural grid in view of small thickness of the former region, a middle plane and two side inclined plane regions of the oil film region are divided into blocks, and the connection parts of the blocks are connected by adopting interfaces; the region structure of the latter is relatively simple, the thickness is larger, the region structure is divided by adopting an unstructured grid, and the joint of the unstructured grid and the oil film region is connected by adopting an interface. After the independence of grid quantity is detected in the oil film area and the non-oil film area, the number of grids in the oil film area is finally determined to be 20 ten thousand, and the number of grids in the non-oil film area is finally determined to be 25 ten thousand; and simulating a calculation model by using FLUENT fluid analysis software after grid division, solving a pressure-velocity coupling equation by using a SIMPLEC method, and performing second-order windward format difference on a convection term, turbulent kinetic energy and dissipation rate in a equation set. The lubricating oil inlet and the lubricating oil outlet are respectively positioned on the inner side and the outer side of the model, the boundary conditions are correspondingly set to be a velocity-inlet condition and an outflow condition, the mirror plate surface is set to be a wall condition, and the left side surface and the right side surface of the model are set to be periodic boundary conditions. As shown in fig. 4, fig. 4a is a diagram of the numerical simulation result of the temperature of the surface of the bearing oil film when only the cooling circuit i works; FIG. 4b is a diagram showing the result of numerical simulation of the surface temperature of the oil film of the bearing when the cooling circuit I and the cooling circuit II work together.
The radial temperature values of a pad of the thrust bearing measured in the two cooling modes are shown in table 1, and a comparison graph is shown in fig. 5.
TABLE 1 temperature value of a pad of a thrust bearing along a radius direction measured in two cooling modes
As can be seen from the graphs of FIGS. 4 and 5, the cooling speed of the oil can be increased and the cooling efficiency can be improved when the cooling circuit I and the cooling circuit II work together.
The above examples are merely illustrative for clarity and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (9)
1. A cooling system for a thrust bearing of a hydroelectric generating set is characterized by comprising a cooling loop I and a plurality of cooling loops II;
the cooling loop I comprises a mirror plate pump, an oil collecting tank, a first cooler oil inlet pipe, a first cooler and a first cooler oil outlet pipe, the mirror plate pump is connected with the oil collecting tank in a sealing mode, the oil collecting tank is communicated with an inlet of the first cooler through the first cooler oil inlet pipe, and an outlet of the first cooler is communicated with an oil injection pipe of the thrust bearing through the first cooler oil outlet pipe;
the cooling circuit II comprises a second cooler oil inlet pipe, a second cooler and a second cooler oil outlet pipe; an oil collecting tank is arranged at the position of the oil scraping plate, the oil collecting tank is communicated with an inlet of a second cooler through an oil inlet pipe of the second cooler, and an oil pump is mounted on the oil inlet pipe of the second cooler; the outlet of the second cooler is communicated with the oil outlet pipe of the first cooler through the oil outlet pipe of the second cooler.
2. The hydroelectric generating set thrust bearing cooling system of claim 1, wherein a filter, a first temperature sensor and a first pressure sensor are mounted on the first oil cooler oil inlet pipe.
3. The hydroelectric generating set thrust bearing cooling system according to claim 1 or 2, wherein a second temperature sensor and a second pressure sensor are mounted on the second cooler oil inlet pipe.
4. The cooling system for the thrust bearing of the water turbine generator set according to claim 3, wherein the oil inlet pipe of the first cooler is communicated with the oil inlet pipe of the second cooler through an oil delivery pipe, the oil delivery pipe is provided with a first stop valve, and the oil outlet pipe of the second oil cooler is provided with a second stop valve; and a third stop valve is arranged on the oil inlet pipe of the first oil cooler, and the mounting position of the third stop valve is positioned between the first cooler and the communication point of the oil inlet pipe of the first cooler and the oil delivery pipe.
5. The thrust bearing cooling arrangement of claim 4, wherein the filter incorporates snap tabs.
6. The thrust bearing cooling arrangement of claim 1, wherein the first cooler drain is a collar and all of the second cooler drains are in communication with the collar. 1
7. The thrust bearing cooling device of claim 1, further comprising a ventilator, wherein the ventilator is installed in a foundation pit where the unit thrust bearing is located.
8. The thrust bearing cooling device according to claim 1, wherein the cooling circuit i and the cooling circuit ii are both external circulation circuits, and the first cooler and the second cooler are installed outside the oil sump.
9. The cooling method of the cooling system of the thrust bearing of the water turbine generator set according to any one of claims 1 to 8, wherein the first stop valve, the second stop valve and the third stop valve are all solenoid valves, and the first temperature sensor, the first pressure sensor, the first cooler, the second temperature sensor, the second pressure sensor, the oil pump, the second cooler, the first stop valve, the second stop valve and the third stop valve are all electrically connected with the controller;
setting a temperature threshold in the controller; when the pumped storage unit starts to operate, the cooling circuit I starts to operate, the cooling circuit II does not operate, the first stop valve and the second stop valve are both closed at the moment, and the stop valves are opened;
the method comprises the steps that along with the increase of the operation time of a pumped storage unit, the thrust bearing pad and the oil temperature of the unit gradually rise, when the oil temperature measured by a first temperature sensor on a cooling circuit I is higher than a threshold value, an oil scraping plate is started to start working, a cooling circuit II starts working, and at the moment, a first stop valve, a second stop valve and a third stop valve are all opened.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111166149.3A CN114017445B (en) | 2021-09-30 | 2021-09-30 | Thrust bearing cooling system and method for hydroelectric generating set |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111166149.3A CN114017445B (en) | 2021-09-30 | 2021-09-30 | Thrust bearing cooling system and method for hydroelectric generating set |
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| CN114017445A true CN114017445A (en) | 2022-02-08 |
| CN114017445B CN114017445B (en) | 2023-09-29 |
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| CN114017445B (en) | 2023-09-29 |
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