CN109989830A - Reduce the supercharging air system of turbine oil leakage - Google Patents
Reduce the supercharging air system of turbine oil leakage Download PDFInfo
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- CN109989830A CN109989830A CN201910435774.XA CN201910435774A CN109989830A CN 109989830 A CN109989830 A CN 109989830A CN 201910435774 A CN201910435774 A CN 201910435774A CN 109989830 A CN109989830 A CN 109989830A
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- Prior art keywords
- air
- chamber
- oil
- base bearing
- gas turbine
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
- F01D11/04—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type using sealing fluid, e.g. steam
- F01D11/06—Control thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/16—Arrangement of bearings; Supporting or mounting bearings in casings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/18—Lubricating arrangements
- F01D25/183—Sealing means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/06—Arrangements of bearings; Lubricating
Abstract
Reduce the supercharging air system of turbine oil leakage; it is related to technical field of gas turbine; to solve to cause when the leakage of existing turbine oil, fuel consumption are big, serious, oil temperature is excessively high, rotten and coking; and base bearing is unable to get protection; the problem of lubricating system can not work normally; the inlet end of supercharging air system air compressor, air accumulator and valve group, air compressor is connected to exterior space, and the outlet side of air compressor is connected to the inlet end of air accumulator；The outlet side of air accumulator is connected to the inlet end of valve group；The outlet side of valve group is connected to the air chamber air supply pipe of obturaging of gas turbine, and valve group includes the restricting element and control element being connected in series with each other, and restricting element is pressure reducing valve；The present invention is for preventing lubrication leakage in gas turbine.
Description
Technical field
The present invention relates to technical field of gas turbine, more particularly to anti-lubricating oil leakage technology.
Background technique
Since nineteen seventies, due to the superior function of gas turbine, while there is small in size, power density
Greatly, start the features such as fast, easy to maintain, in industrial peaking generation, compressed natural gas transfer pipeline, offshore platform and combustion-steaming connection
The fields such as circulation power station are closed to be widely used.
No matter gas turbine be as Mechanical Driven, or as power generation use, it be all by compressor, combustion chamber, turbine,
And subsystem is formed, it can regard air continuous compression in compressor as, after heating in flowing in combustion chamber constantly
The combustion gas with certain pressure and temperature is generated, then flows into expansion work in turbine, partial heat energy is converted to the height of mechanical energy
Quick-action power rotating machinery；Any high-speed rotating single rotor is supported by least two base bearing, to keep high-speed rotating
Rotor is in normal operating conditions, and base bearing produces a large amount of heat when working, and is usually all using injection oil lubrication
Method takes away these heats；Therefore, the reliability service of gas turbine depends greatly on the quality of lubricating system.
The effect of lubricating system is to pump lubricating oil from lubricating oil oil feed pump to the working surface of base bearing and meshing gear, is taken away
Due to the heat that the frictional heat and high ambient temperatures part that generate under high-speed rotation transmit, to maintain base bearing and meshing gear
Normal temperature condition, and continuous oil film is formed between roller, between the flank of tooth that is meshed in the raceway of base bearing, to play liquid
Body lubrication effect, then by lubricating oil scavenge oil pump aspirate the intracavitary lubricated lubricating oil of base bearing, reduce these working faces abrasion and
Friction loss, and their corrosion and Surface hardened layer are prevented, while also taking away the hard field trash formed between working face；It is same with this
When, a certain amount of lubricating oil that invariably accompanies is consumed；The main path of turbine oil consumption has: 1) passing through bearing bore
The leakage of oil sealing arrangement；2) the heat consumption loss of lubricating oil；3) the intracavitary lubricating oil of base bearing is discharged in atmosphere with lubricating oil ventilating system
Loss.It is the content that the application mainly studies for the lubrication leakage as caused by sealing device imprecision；
On December 9th, 2015 discloses CN 105143610B, is entitled " for preventing the lubricating oil in gas turbine from letting out
The method and system of leakage " Chinese invention patent, gas-turbine unit operation when, will be enough using compressed air source
Compressed air is supplied to the oil sump of turbine bearing receiving, pressurizes to oil pocket；If in certain fortune of gas-turbine unit
Row situation, from engine compressed air source supply insufficient pressure when, using external compressed air source supply compressed air,
Gas-turbine unit is run, but the control of gas-turbine unit；But the patent, which only proposes, is added auxiliary compression sky
The working method of gas source, the specific structure of undisclosed compressed air system.
The oil sealing arrangement of existing gas turbine bearing bore includes: that pressurization bleed air system 20, the lubricating oil of base bearing chamber are close
Envelope 3, the air sealing 2 for obturaging air chamber etc., in order to guarantee gas turbine reliability service under whole service operating condition, using two-stage
Sealing structure thus forms base bearing chamber 7 and obturages 5 two chambers of air chamber；
Base bearing chamber 7 is by oil seal 3, base bearing cavity wall 6, base bearing chamber snorkel 8, lubricating oil fuel feed pump 9, base bearing 10
With the formation of base bearing chamber oil exit pipe 13；
Base bearing cavity wall 6 is the peripheral wall of main bearing bore 7, and multiple oil seals 3 are provided in base bearing cavity wall 6 for close
Envelope,
Base bearing chamber snorkel 8 penetrates base bearing cavity wall 6, so that base bearing chamber 7 is connected to exterior space,
Two lubricating oil fuel feed pumps 9 penetrate base bearing cavity wall 6, so that base bearing chamber 7 is connected to exterior space,
Base bearing 10 is provided in base bearing chamber 7,
Base bearing chamber oil exit pipe 13 is used to for the sump oil in base bearing chamber 7 being discharged；
Obturage air chamber 5 by air sealing 2, obturage air cavity wall 4, obturage air chamber air supply pipe 11, obturage air chamber row
Oil pipe 12 and the formation of air flow path 14；
Obturaging air cavity wall 4 is to obturage the peripheral wall of air chamber 5, obturages and is provided with multiple air sealings 2 in air cavity wall 4
For sealing,
It obturages air chamber air supply pipe 11 and penetrates and obturage air cavity wall 4, be connected to so that obturaging air chamber 5 with air flow path 14,
Air chamber oil exit pipe 12 is obturaged for the discharge of the sump oil in air chamber 5 will to be obturaged；
Pressurization bleed air system 20 refers to that compressed air is extracted from bleed chamber 21 between the compressor stage of gas turbine passes through sky
Flow channel 22 is passed through the system for obturaging air chamber air supply pipe 11,
Change since the pressure from the pressurization offer air of bleed air system 20 is the operating condition with gas turbine, seals
Pressure difference between tight air chamber 5 and base bearing chamber 7 and air flow path 14 is also the difference with operating condition and changes；But
It is, when gas turbine is run under the lower operating condition such as starting, slow train, transition state and shutdown, to obturage air chamber 5 and base bearing
Pressure difference in chamber 7 is lower than design permissible value, so that the lubricating oil or gas mixture in base bearing chamber 7 are flowed along oil seal 3
It is leaked to air chamber 5 is obturaged, lube use rate is caused to be increased；Under serious conditions, when high-temperature gas on air flow path 14
When pressure is higher, this part high-temperature gas flows into base bearing chamber 7 by air sealing 2 and oil seal, causes oil temperature
Phenomena such as excessively high, rotten and coking.
Therefore there are the following problems for the existing pressurization bleed air system 20 for preventing turbine oil leakage:
1, when gas turbine is run under the lower operating condition such as starting, slow train, transition state, shutdown, due to obturaging air
Pressure difference in chamber 5 and base bearing chamber 7 causes lubrication leakage lower than design permissible value, so that fuel consumption increases, under serious conditions
Phenomena such as causing excessively high oil temperature, rotten and coking；
2, lubrication leakage causes base bearing to be unable to get protection, and lubricating system can not work normally.
Summary of the invention
Present invention seek to address that the sealing device and pressurization bleed air system 20 of existing gas turbine not can guarantee and obturage air
The stabilization of pressure value in chamber 5 and base bearing chamber 7, causes lubrication leakage, so that fuel consumption is big, causes lubricating oil under serious conditions
Temperature is excessively high, rotten and coking；And the problem of base bearing is unable to get protection, and lubricating system can not work normally.
To solve the above problems, technical solution is as follows:
The supercharging air system of turbine oil leakage, including air compressor 19, air accumulator 18 and valve group are reduced,
The inlet end of air compressor 19 is connected to exterior space,
The outlet side of air compressor 19 is connected to the inlet end of air accumulator 18；
The outlet side of air accumulator 18 is connected to the inlet end of valve group；
The outlet side of valve group is connected to the air chamber air supply pipe 11 of obturaging of gas turbine,
Valve group includes the restricting element and control element being connected in series with each other,
Restricting element is pressure reducing valve 17；
The application has the advantage that
1, when gas turbine operation, the instruction for opening valve group is issued by control system, directly initiates newly-increased supercharging air
System, compressed air enters after valve group and obturages in air chamber 5 in air accumulator, and air chamber 5 and base bearing chamber 7 are obturaged in guarantee
Between pressure difference design permissible value within the scope of, the lubrication leakage in base bearing chamber 7 can be greatly reduced, moreover it is possible to air-flow be isolated
The inflow of 14 high-temperature gas of flow path；
2, base bearing is effectively protected, lubricating system can work normally, while reduce system operation cost.
Detailed description of the invention
Fig. 1 is the structure chart that supercharging air system is applied to gas turbine；
Fig. 2 is the structure chart of the oil sealing arrangement ontology of existing gas turbine bearing bore；
Fig. 3 is the structure chart of the pressurization bleed air system of existing oil sealing arrangement ontology and amplification；
Fig. 4 is the structure chart of gas turbine bearing bore；
In figure: 1. shafts；2. air seals；3. oil seal；4. obturaging air cavity wall；5. obturaging air chamber；6. main shaft
Hold cavity wall；7. base bearing chamber；8. base bearing chamber exhaust pipe；9. lubricating oil fuel feed pump；10. base bearing；11. obturaging air chamber gas supply
Pipe；12. obturaging air chamber oil exit pipe；13. base bearing chamber oil exit pipe；14. air flow path；15. gs-oil separator；16. regulating valve；
17. pressure reducing valve；18. air accumulator；19. air compressor；20. being pressurized bleed air system；21. bleed chamber between grade；22. air flow channel.
Specific embodiment
It is to be understood that although in detail below illustrate the Exemplary realisations of embodiments of the present invention,
But currently known or not yet existing any other suitable technology can be used to realize in disclosed composition.Therefore,
The present invention should not be limited to absolutely the exemplary implementation scheme being described below, but in appended claims and its can wait
With being appropriately modified in the range of scheme.The present invention is more fully described now with reference to attached drawing, shown in the drawings of this
The illustrative embodiments of invention.But the present invention can be realized according to more different forms, and be not construed as limiting
It is formed on embodiments set forth herein.On the contrary, thesing embodiments are provided so that the disclosure becomes thorough and complete, and this is sent out
Bright design is entirely delivered to those skilled in the art.
Specific embodiment one illustrates present embodiment below with reference to Fig. 1-4, and present embodiments provide for reduce combustion gas wheel
The supercharging air system of machine lubrication leakage,
Including air compressor 19, air accumulator 18 and valve group,
The inlet end of air compressor 19 is connected to exterior space,
The outlet side of air compressor 19 is connected to the inlet end of air accumulator 18；
The outlet side of air accumulator 18 is connected to the inlet end of valve group；
The outlet side of valve group is connected to the air chamber air supply pipe 11 of obturaging of gas turbine,
Valve group includes the restricting element and control element being connected in series with each other,
Restricting element is pressure reducing valve 17；
Pressure in air accumulator 18 is in standard value；
When the pressure of compressed air in air accumulator 18 drops to low pressure limit value, air compressor 19 is air accumulator automatically
18 tonifying Qi；
When the pressure of compressed air in air accumulator 18 rises to upper pressure limit value, 19 autostop of air compressor；
Valve group includes the restricting element and control element being connected in series, the outlet side of control element and restricting element into
The connection of gas end；
Control element is regulating valve 16；
The outlet side of air accumulator 18 is connected to the inlet end of regulating valve 16, the outlet side of regulating valve 16 and pressure reducing valve 17 into
The connection of gas end；
The outlet side of pressure reducing valve 17 is connected to the air chamber air supply pipe 11 of obturaging of gas turbine；
The structure principle chart that supercharging air system is applied to gas turbine is as shown in Figure 1；
Working method and step:
The system includes air compressor 19, air accumulator 18, pressure reducing valve 17 and regulating valve 16；
When gas turbine operation, the instruction for opening regulating valve 16 is issued by control system, starts newly-increased supercharging air system,
Compressed air enters after regulating valve 16 and pressure reducing valve 17 and obturages in air chamber 5 in air accumulator 18, guarantees to obturage
Pressure difference between air chamber 5 and base bearing chamber 7 is within the scope of design permissible value, the stream of high-temperature gas also on isolation air flow path 14
Enter；Air is to be automatically replenished by air compressor 19, and be maintained in the range of pressure values of setting in air accumulator 18；Work as air accumulator
When the pressure of compressed air drops to low pressure limit value in 18,19 automatic inflating device of air compressor；It is empty when being compressed in air accumulator 18
When the pressure of gas rises to upper pressure limit value, 19 autostop of air compressor；
When gas turbine operation, is supplied compressed air to by newly-increased supercharging air system and obturage air chamber 5, thus be avoided that
Phenomena such as causing excessively high oil temperature, rotten and coking, and turbine oil consumption can be reduced and save combustion gas
The operating cost of turbine；
The course of work and principle:
The structure principle chart of the oil sealing arrangement ontology of existing gas turbine bearing bore is as shown in Figure 2；It is provided with pressurization
Bleed air system 20,
The schematic diagram of existing pressurization bleed air system 20 is as shown in Figure 3；
Pressurization bleed air system 20 refers to that compressed air is extracted from bleed chamber 21 between the compressor stage of gas turbine passes through sky
Flow channel 22 is passed through the system for obturaging air chamber air supply pipe 11；
And existing combustion turbine system is under the lower operating condition such as starting, slow train, transition state and shutdown when running, existing dress
It sets due to obturaging the pressure difference in air chamber 5 and base bearing chamber 7 lower than design permissible value range, so that the cunning in base bearing chamber 7
Oil or gas mixture are leaked along oil seal 3 to air chamber 5 is obturaged, and lube use rate is caused to be increased；Serious conditions
Under, when the pressure of high-temperature gas on air flow path 14 is higher, this part high-temperature gas is by air sealing 2 and oil seal 3
Phenomena such as flowing into base bearing chamber 7, causing excessively high oil temperature, rotten and coking,
And bearing bore structure principle chart is as shown in figure 4, gas turbine bearing bore is formd and obturaged using two-stage sealing structure
7 two chambers of air chamber 5 and base bearing chamber,
Air chamber 5 is obturaged to include air sealing 2, obturage air cavity wall 4, obturage air chamber air supply pipe 11, obturage air chamber
Oil exit pipe 12 and air flow path 14,
Base bearing chamber 7 includes oil seal 3, base bearing cavity wall 6, base bearing chamber snorkel 8, lubricating oil fuel feed pump 9, base bearing
10 and base bearing chamber oil exit pipe 13；
The supercharging air system structure principle chart of present embodiment by optimization design as shown in Figure 1,
Supercharging air system includes regulating valve 16, pressure reducing valve 17, air accumulator 18 and air compressor 19, and connection structure is as above
Described in text；Gas turbine is obturaged 5 seal gas of air chamber and is taken out not instead of from bleed chamber 21 between compressor stage, by supercharging air
System provides,
Pressure in air accumulator 18 in standard value,
When the pressure of compressed air in air accumulator 18 drops to low pressure limit value, air compressor 19 is air accumulator automatically
18 tonifying Qi,
When the pressure of compressed air in air accumulator 18 rises to upper pressure limit value, 19 autostop of air compressor,
Gas turbine base bearing chamber 7 using oil seal 3 and air sealing 2, obturage in air chamber 5 by oil seal 3
Air, the evaporation of the air, lubricating oil that leak from oil seal 3 and air by the lubricating oil of splashing and environment are thermally formed oil gas
Mixture enters the gs-oil separator 15 of ventilating system by base bearing chamber exhaust pipe 8, realizes the oil of gas turbine base bearing chamber 7
Gas separation and ventilation；
And air sealing 2 separates the high-temperature gas of air flow path 14, prevents 14 high temperature gas of air flow path from entering master
Bearing bore 7；
When gas turbine operation, the instruction for opening regulating valve 16 is issued by control system, is directly initiated newly-increased air and is increased
Pressure system, the compressed air in air accumulator 18 enters after regulating valve 16 and pressure reducing valve 17 obturages in air chamber 5, guarantees to obturage
Pressure difference between air chamber 5 and base bearing chamber 7 can greatly reduce the cunning in base bearing chamber 7 within the scope of design permissible value
Oil leakage, moreover it is possible to the inflow of 14 high-temperature gas of air flow path be isolated；
Air in air accumulator 18 is to be automatically replenished by air compressor 19, and be maintained in the range of pressure values of setting,
When the pressure of compressed air in air accumulator 18 drops to low pressure limit value, 19 automatic inflating device of air compressor,
When the pressure of compressed air in air accumulator 18 rises to upper pressure limit value, 19 autostop of air compressor；
The supercharging air system of present embodiment can efficiently reduce lubrication leakage when gas turbine operation；
Therefore the pressure in air accumulator 18 can be effectively ensured by using improved supercharging air system and is in one
Within the scope of preset reference pressure value, make which ensure that the pressure difference obturaged between air chamber 5 and base bearing chamber 7 is allowing
In the range of value, therefore the lubrication leakage phenomenon generated when gas turbine operation can be efficiently reduced；
Arrow in Fig. 1 and Fig. 2 indicates the flow direction of lubricating oil, gas mixture and air.
Therefore, the present invention should not be limited to absolutely the specific embodiment being described above, but can weigh in accompanying
It is appropriately modified in the range of benefit requirement and its equivalent program；
Certainly, above description is not limitation of the present invention, and the present invention is also not limited to the example above, the art
The variations, modifications, additions or substitutions that those of ordinary skill is made within the essential scope of the present invention also belong to guarantor of the invention
Protect range.
Claims (3)
1. reducing the supercharging air system of turbine oil leakage, it is characterised in that: including air compressor (19), air accumulator
(18) and valve group,
The inlet end of air compressor (19) is connected to exterior space,
The outlet side of air compressor (19) is connected to the inlet end of air accumulator (18)；
The outlet side of air accumulator (18) is connected to the inlet end of valve group；
The outlet side of valve group is connected to the air chamber air supply pipe (11) of obturaging of gas turbine,
Valve group includes the restricting element and control element being connected in series with each other,
Restricting element is pressure reducing valve (17).
2. the supercharging air system according to claim 1 for reducing turbine oil leakage, it is characterised in that: control member
Part is regulating valve (16).
3. the sealing system according to claim 2 for reducing lubrication leakage, it is characterised in that: the outlet side of air accumulator (18)
It is connected to the inlet end of regulating valve (16),
The outlet side of pressure reducing valve (17) is connected to the air chamber air supply pipe (11) of obturaging of gas turbine.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910435774.XA CN109989830A (en) | 2019-05-23 | 2019-05-23 | Reduce the supercharging air system of turbine oil leakage |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910435774.XA CN109989830A (en) | 2019-05-23 | 2019-05-23 | Reduce the supercharging air system of turbine oil leakage |
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