CN220451989U - Sealing and isolating device for steam leakage and blowing of steam seal of steam turbine - Google Patents
Sealing and isolating device for steam leakage and blowing of steam seal of steam turbine Download PDFInfo
- Publication number
- CN220451989U CN220451989U CN202321915759.3U CN202321915759U CN220451989U CN 220451989 U CN220451989 U CN 220451989U CN 202321915759 U CN202321915759 U CN 202321915759U CN 220451989 U CN220451989 U CN 220451989U
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- steam turbine
- steam
- pressure end
- turbine
- ring groove
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- 238000007789 sealing Methods 0.000 title claims abstract description 18
- 238000007664 blowing Methods 0.000 title abstract description 6
- 238000002955 isolation Methods 0.000 claims description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 49
- 239000010687 lubricating oil Substances 0.000 description 8
- 238000005299 abrasion Methods 0.000 description 7
- 238000001914 filtration Methods 0.000 description 6
- 210000004907 gland Anatomy 0.000 description 5
- 238000001816 cooling Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910000623 nickel–chromium alloy Inorganic materials 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Abstract
The application discloses a sealing and isolating device for steam leakage and blowing of a steam turbine, which belongs to the technical field of energy conservation, consumption reduction and emission reduction and meets the standards, and comprises a high-pressure end ring groove of the steam turbine and a low-pressure end ring groove of the steam turbine, wherein the high-pressure end ring groove of the steam turbine is arranged at a high-pressure end of the steam turbine, and the low-pressure end ring groove of the steam turbine is arranged at a low-pressure end of the steam turbine; a front box oil baffle is arranged on a front box bearing seat at the high-pressure end of the steam turbine, and is positioned at one end of the front box bearing seat facing the steam turbine; a rear box oil baffle is arranged on a rear box bearing seat at the low pressure end of the steam turbine, and is positioned at one end of the rear box bearing seat facing the steam turbine; the turbine high-pressure end annular groove, the turbine low-pressure end annular groove, the front tank oil shield and the rear tank oil shield are connected together with an air pipe for introducing a dry air source. According to the method, the annular groove and the oil baffle gap are utilized to inject dry air with certain pressure into the annular groove and the oil baffle gap, steam is blocked from entering the oil system by the air, the purpose of 'gas seal steam' is achieved, and potential safety hazards are eliminated.
Description
Technical Field
The application relates to the technical field of energy conservation, consumption reduction and emission reduction reaching standards, in particular to a sealing and isolating device for steam leakage and air blowing of a steam turbine.
Background
At present, in industrial enterprises and in the process of power production, a steam turbine is one of three major components of a power plant, plays an extremely important role in power production, and is a rotary machine which takes steam as a working medium and converts heat energy of the steam into mechanical energy. In order to avoid collisions between the turbine motor and stationary parts, appropriate clearances must be left. The presence of these gaps in turn necessarily creates vapor leakage, which reduces efficiency. In order to solve the contradiction, a sealing device, namely a gland seal, is arranged at a gap between a turbine motor and a static part, and the gland seal is one type of the gland seal and is divided into a high-pressure gland seal and a low-pressure gland seal. The high pressure end and the low pressure end are respectively provided with a thin-sheet shaft seal, the shaft seal sheets are provided with a plurality of grooves on the shaft sleeve and the shaft seal ring of the steam turbine, a soft and thin nickel-chromium alloy sheet (with the thickness of 0.2 mm) is embedded into the shaft sleeve by using nickel-chromium steel wires, and a certain gap is reserved between the nickel-chromium alloy sheet and the shaft seal sleeve, so that a tortuous steam leakage channel is formed, steam leakage is reduced, and the sealing effect is realized.
However, with the increase of the running time, the abrasion of the shaft seal caused by the bending or permanent deformation of the rotor due to the heating, the abrasion of one side of the cylinder deformation shaft seal, the abrasion of the shaft seal caused by the uneven heating of the rotor and the cylinder, and the like, so that the steam leakage amount of the shaft seal of the steam turbine is increased, and the leaked steam enters the steam turbine system along the high-speed running steam turbine rotor, thereby causing water in lubricating oil, even damaging the shaft oil film and damaging the bearing in serious cases. The function of the high pressure shaft seal is to prevent steam from leaking out of the cylinder. The low-pressure shaft seal has the function of preventing outside air from leaking into the cylinder, so that the vacuum of the condenser is reduced and the quality of condensed water is poor. Besides increasing heat loss of the unit, the shaft seal steam leakage also can reduce the power of the turbine in severe cases, and has great threat to safe and economic operation of the turbine. If the leakage of the high-pressure end shaft seal is too large, steam can flow into the bearing along the axial flow to directly heat the bearing, meanwhile, the moisture and the oil are mixed in the lubricating oil to deteriorate, the lubrication of the bearing is destroyed, and serious accidents are caused by tungsten financeization of the bearing. The low-pressure end shaft seal leaks too much steam, so that the steam turbine can operate under low vacuum, the economical efficiency is obviously reduced, the exhaust steam temperature is increased, the vibration of the steam turbine is increased, the axial thrust is increased, and serious operation potential safety hazards and energy losses are brought to the steam turbine.
Disclosure of Invention
The utility model provides a to the not enough that prior art exists, provide a sealed isolating device of steam turbine steam seal steam leakage blast air, install sealed ring channel and steam turbine front and back case oil rail outside tuber pipe additional in the steam turbine high, low pressure bearing seal outside, utilize ring channel and oil rail clearance to the dry air of certain pressure of its middle injection, borrow the air to separate steam and get into in the oil system, realize "the purpose of gas seal steam" promptly, eliminate the potential safety hazard.
The technical scheme for solving the technical problems is as follows:
the steam seal steam leakage blast sealing isolation device comprises a steam turbine high-pressure end ring groove and a steam turbine low-pressure end ring groove, wherein the steam turbine high-pressure end ring groove is arranged at the high-pressure end of a steam turbine, and the steam turbine low-pressure end ring groove is arranged at the low-pressure end of the steam turbine; a front box oil baffle is arranged on a front box bearing seat at the high-pressure end of the steam turbine, and is positioned at one end of the front box bearing seat facing the steam turbine; a rear box oil baffle is arranged on a rear box bearing seat at the low pressure end of the steam turbine, and is positioned at one end of the rear box bearing seat facing the steam turbine; the turbine high-pressure end annular groove, the turbine low-pressure end annular groove, the front tank oil shield and the rear tank oil shield are connected with an air pipe for introducing a dry air source.
By adopting the technical scheme, the sealing annular grooves and the air pipes for introducing a dry air source are additionally arranged at the outer sides of the high-pressure shaft seals and the low-pressure shaft seals of the steam turbine, the outer sides of the oil level reformation of the front and rear boxes of the steam turbine are connected, the annular grooves and the oil level clearance are utilized to inject dry air with certain pressure into the middle of the annular grooves and the oil level clearance, and the air is utilized to prevent the steam seal leakage of the steam turbine from entering the lubricating oil system, so that the purpose of 'gas seal steam' is realized, and the potential safety hazard is eliminated.
Further, the air pipe is connected with an air blower through an air blower outlet pipeline.
By adopting the technical scheme, the air blower is used as a sealing air source, and the air blower isolation device has small equipment volume and simple structure, can be directly arranged on the running layer of the steam turbine, and is convenient to monitor and overhaul.
Further, two blowers are arranged, and the outlets of the two blowers are connected in parallel.
By adopting the technical scheme, two blowers are used for one time, and the operation stability can be ensured.
Further, a blower outlet pipe filter is connected to a blower outlet pipe in parallel connection with outlets of the two blowers.
By adopting the technical scheme, the air source purifying and filtering device not only can play a role in purifying and filtering an air source, but also can minimize the use quantity of the air blower outlet pipe filters.
Further, an outlet of the blower is connected with a check valve.
By adopting the technical scheme, the equipment can be automatically switched on line conveniently.
Further, the PLC program control is additionally arranged on the blower, the rotating speed of the variable frequency motor is changed through the pressure signal, the wind pressure is controlled to operate within a specified range, the parameters are effectively controlled, the safe operation of the isolation device is ensured, and the equipment fault interlocking device is additionally arranged.
Further, the air pipe is connected with a generator through a generator wind source pipeline.
By adopting the technical scheme, the generator operation air source is used as a fault standby air source and is connected with the air pipe, and the pressure air generated when the generator cooling fan operates at a high speed is sent into the front bearing oil baffle groove and the rear bearing oil baffle groove of the steam turbine along the generator air source pipeline and the air pipe, so that air circulation is formed in the oil baffle ring to prevent the shaft seal of the steam turbine from leaking.
Further, the generator wind source pipeline is connected with a generator wind pipe outlet valve and a generator wind pipe outlet filter, and the generator wind pipe outlet filter is positioned at one end of the generator wind pipe outlet valve far away from the generator.
By adopting the technical scheme, the air source purifying and filtering device plays a role in purifying and filtering an air source.
Furthermore, the turbine high-pressure end ring groove and the turbine low-pressure end ring groove both comprise two semi-annular grooves, and the two semi-annular grooves are fixed through bolts.
By adopting the technical scheme, the movable installation of the turbine high-pressure end ring groove and the turbine low-pressure end ring groove is realized, and the abrasion and replacement of sealing materials are facilitated.
Furthermore, the turbine high-pressure end ring groove and the turbine low-pressure end ring groove are both assembled by adopting copper plates and multiple layers of graphite sheets.
By adopting the technical scheme, zero abrasion of the running rotor of the steam turbine is effectively ensured.
Further, the outlet pressure of the dry air source is less than 0.2Mpa.
By adopting the technical scheme, the bearing oil film is prevented from being damaged by overlarge wind pressure, and the bearing is prevented from being damaged.
In summary, compared with the prior art, the beneficial effects of the technical scheme are as follows:
(1) The sealing annular groove and the air pipes for introducing a dry air source are additionally arranged at the outer sides of the high-pressure shaft seal and the low-pressure shaft seal of the steam turbine, the outer sides of the oil baffle reformation of the front and rear boxes of the steam turbine are connected, the annular groove and the oil baffle gap are utilized to inject dry air with certain pressure into the middle of the annular groove and the oil baffle gap, and the air is utilized to prevent the steam seal leakage of the steam turbine from entering the lubricating oil system, so that the aim of 'gas seal steam' is fulfilled, and the potential safety hazard is eliminated;
(2) The blast isolation device has small equipment volume and simple structure, can be directly arranged on the running layer of the steam turbine and is convenient to monitor and overhaul by taking the blast blower as a sealing air source; the two blowers are used for one time, so that the running stability can be ensured;
(3) The generator operation air source is used as a fault standby air source and is connected with an air pipe, and the pressure air generated when the generator cooling fan operates at a high speed is sent into the front and rear bearing oil baffle grooves of the steam turbine along the generator air source pipeline and the air pipe, so that air circulation is formed in the oil baffle ring to prevent the steam turbine shaft seal from leaking steam.
Drawings
FIG. 1 is a schematic overall structure of an embodiment of the present application;
FIG. 2 is a schematic view showing the structure of two semi-annular grooves in the embodiment of the present application;
FIG. 3 is a schematic view showing the structure of two oil rings in the embodiment of the present application.
Reference numerals illustrate: 1. a steam turbine; 2. a generator; 3. a front box bearing seat; 4. a rear box bearing seat; 5. a front tank oil shield; 6. a turbine high-pressure end ring groove; 7. a turbine low pressure end ring groove; 8. a rear tank oil shield; 9. an observation hole; 10. a blower outlet duct; 11. a generator wind source pipeline; 12. a blower; 13. a non-return valve; 14. a blower outlet tube filter; 15. an outlet filter of the air pipe of the generator; 16. an outlet valve of an air pipe of the generator; 17. an air duct; 18. a semi-annular groove; 19. a bolt; 20. an oil baffle ring.
Detailed Description
The principles and features of the present application are described below with reference to fig. 1-3, the examples being provided for illustration only and not for limitation of the scope of the present application.
The embodiment of the application discloses a sealing and isolating device for steam leakage and blowing of a steam turbine.
Referring to fig. 1-3, a sealing and isolating device for the air leakage and blowing of a steam turbine steam seal comprises a high-pressure end ring groove 6 of the steam turbine, a low-pressure end ring groove 7 of the steam turbine, a front tank oil rail 5 and a rear tank oil rail 8, wherein the high-pressure end ring groove 6 of the steam turbine, the low-pressure end ring groove 7 of the steam turbine, the front tank oil rail 5 and the rear tank oil rail 8 are commonly connected with an air pipe 17 for introducing a dry air source, dry air with certain pressure is injected into the middle of the annular groove and an oil rail gap, and the air is used for blocking the air leakage of the shaft seal of the steam turbine 1 from entering a lubricating oil system, so that the aim of air seal steam is fulfilled, and potential safety hazards are eliminated.
The turbine high-pressure end ring groove 6 is arranged at the high-pressure end of the turbine 1, and the turbine low-pressure end ring groove 7 is arranged at the low-pressure end of the turbine 1. The turbine high-pressure end ring groove 6 and the turbine low-pressure end ring groove 7 which are additionally arranged according to the diameter of the rotor of the turbine 1 respectively comprise two semi-annular grooves 18, and can be manufactured by using old steam seal blocks. The outer side of the upper half semi-annular groove 18 is drilled with holes (phi 25 mm) on the left and right for connecting with the air pipe 17, and the two semi-annular grooves 18 are fixed through bolts 19. After the air enters, air circulation is formed in the annular groove to prevent the steam turbine 1 shaft seal from leaking steam to enter the lubricating oil system, movable installation of the annular groove is realized, and abrasion and replacement of sealing materials are facilitated.
The turbine high-pressure end ring groove 6 and the turbine low-pressure end ring groove 7 are assembled by adopting copper plates and multiple layers of graphite sheets, so that zero abrasion of a rotor of the turbine operation is effectively ensured.
The front box oil shield 5 is arranged on a front box bearing seat 3 at the high pressure end of the steam turbine 1 and is positioned at one end of the front box bearing seat 3 facing the steam turbine 1; the rear box oil shield 8 is arranged on the rear box bearing seat 4 at the low pressure end of the steam turbine 1 and is positioned at one end of the rear box bearing seat 4 facing the steam turbine 1. The front tank oil baffle 5 and the rear tank oil baffle 8 comprise two oil baffle rings 20, the two oil baffle rings 20 are fixed through bolts 19, holes are drilled on the left and right sides of the outer side of the lower half oil baffle ring 20 (phi 20mm, only the outermost side of the oil baffle ring 20 is drilled when the holes are drilled, air circulation is formed in the oil baffle), joints are arranged after tapping, and air is introduced into the connecting air pipe 17 to prevent the steam turbine 1 shaft seal leakage from entering a lubricating oil system.
The air duct 17 is connected with two sealing air sources, one is provided with the blower 12, and the other is an air source generated by the operation of the generator 2.
The blower 12 is connected with an air pipe 17 on the rear box oil shield 8 through a blower outlet pipeline 10, and the blower 12 is arranged beside the rear box of the steam turbine 1. The blast isolating device has small equipment volume and simple structure by using the blast blower 12 as a sealing air source, can be directly arranged on the running layer of the steam turbine 1, and is convenient for monitoring and maintenance.
The two blowers 12 are arranged, and the outlets of the two blowers 12 are connected in parallel, so that the two blowers 12 are one by one, and the running stability can be ensured. The outlet of the blower 12 is connected with a check valve 13, which is convenient for automatic on-line switching of equipment. The blower outlet pipe filters 14 are connected to the blower outlet pipes 10, which are connected in parallel to the outlets of the two blowers 12, so that the effect of purifying and filtering air sources can be achieved, and the use quantity of the blower outlet pipe filters 14 can be minimized.
The PLC program control is additionally arranged on the air blower 12, the rotating speed of the variable frequency motor is changed through the pressure signal, the air pressure is controlled to operate within a specified range, parameters are effectively controlled, the safe operation of the isolation device is ensured, and the equipment fault interlocking device is additionally arranged.
The operation air source of the generator 2 is used as a fault standby air source, and the generator 2 is connected with an air pipe 17 on the rear tank oil rail 8 through a generator air source pipeline 11. An observation hole 9 is formed in the front end cover of the generator 2, a generator wind source pipeline 11 is led out from the observation hole to be connected with drilling positions of oil baffle rings 20 of a front box oil baffle 5 and a rear box oil baffle 8, and pressure air generated during high-speed operation of a cooling fan of the generator 2 is sent into oil baffle grooves of a front bearing and a rear bearing of the steam turbine 1 along the generator wind source pipeline 11 and an air pipe 17 so as to form air circulation in the oil baffle rings 20 to prevent leakage of shaft seal steam of the steam turbine 1.
The generator wind source pipeline 11 is connected with a generator wind pipe outlet valve 16 and a generator wind pipe outlet filter 15, and the generator wind pipe outlet filter 15 is positioned at one end of the generator wind pipe outlet valve 16 far away from the generator 2, so as to play a role in purifying and filtering a gas source.
Air connection pipelines such as an air pipe 17, an air blower outlet pipeline 10, a generator wind source pipeline 11 and the like are all temperature-resistant hoses, so that the installation and the maintenance are convenient. The outlet pressure of the dry air source is less than 0.2Mpa so as to avoid the overlarge wind pressure, damage the bearing oil film and damage the bearing.
The implementation principle of the steam leakage blast sealing and isolating device of the steam turbine steam seal provided by the embodiment of the application is as follows: the outer sides of the high-pressure shaft seals and the low-pressure shaft seals of the steam turbine 1 are additionally provided with sealing annular grooves, the outer sides of the oil level reformation of the front and rear boxes of the steam turbine 1 are connected with an air pipe 17 for introducing a dry air source, dry air with certain pressure is injected into the annular grooves and the oil level gaps, and the air is used for blocking the leakage steam of the shaft seals of the steam turbine 1 from entering a lubricating oil system, so that the aim of 'gas seal steam' is fulfilled, and potential safety hazards are eliminated.
The foregoing description of the preferred embodiments of the present application is not intended to limit the utility model to the particular embodiments of the present application, but to limit the scope of the utility model to the particular embodiments of the present application.
Claims (10)
1. A steam leakage blast sealing and isolating device for a steam turbine is characterized in that: the high-pressure end ring groove (6) of the steam turbine and the low-pressure end ring groove (7) of the steam turbine are included, the high-pressure end ring groove (6) of the steam turbine is arranged at the high-pressure end of the steam turbine (1), and the low-pressure end ring groove (7) of the steam turbine is arranged at the low-pressure end of the steam turbine (1); a front box oil rail (5) is arranged on a front box bearing seat (3) at the high pressure end of the steam turbine (1), and the front box oil rail (5) is positioned at one end of the front box bearing seat (3) facing the steam turbine (1); a rear box oil rail (8) is arranged on a rear box bearing seat (4) at the low pressure end of the steam turbine (1), and the rear box oil rail (8) is positioned at one end of the rear box bearing seat (4) facing the steam turbine (1); the turbine high-pressure end ring groove (6), the turbine low-pressure end ring groove (7), the front tank oil rail (5) and the rear tank oil rail (8) are connected with an air pipe (17) for introducing a dry air source.
2. The steam turbine steam seal leakage blast seal isolation device according to claim 1, wherein: the air pipe (17) is connected with an air blower (12) through an air blower outlet pipeline (10).
3. The steam turbine steam seal leakage blast seal isolation device according to claim 2, wherein: the two blowers (12) are arranged, and the outlets of the two blowers (12) are connected in parallel.
4. A steam turbine steam seal leakage blast seal isolation device according to claim 3, wherein: the blower outlet pipeline (10) with outlets of the two blowers (12) connected in parallel is connected with a blower outlet pipe filter (14).
5. A steam turbine steam seal leakage blast seal isolation device according to claim 3 or 4, wherein: the outlet of the blower (12) is connected with a check valve (13).
6. The steam turbine steam seal leakage blast seal isolation device according to claim 2, wherein: the wind pipe (17) is connected with a generator (2) through a generator wind source pipeline (11).
7. The steam turbine steam seal leakage blast seal isolation device according to claim 6, wherein: the wind source pipeline (11) of the generator is connected with a generator wind pipe outlet valve (16) and a generator wind pipe outlet filter (15), and the generator wind pipe outlet filter (15) is positioned at one end of the generator wind pipe outlet valve (16) far away from the generator (2).
8. The steam turbine steam seal leakage blast seal isolation device according to claim 1, wherein: the turbine high-pressure end ring groove (6) and the turbine low-pressure end ring groove (7) comprise two semi-annular grooves (18), and the two semi-annular grooves (18) are fixed through bolts (19).
9. The steam turbine steam seal leakage blast seal isolation device according to claim 1, wherein: the turbine high-pressure end ring groove (6) and the turbine low-pressure end ring groove (7) are assembled by adopting copper plates and multi-layer graphite sheets.
10. The steam turbine steam seal leakage blast seal isolation device according to claim 1, wherein: the outlet pressure of the dry air source is less than 0.2Mpa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321915759.3U CN220451989U (en) | 2023-07-20 | 2023-07-20 | Sealing and isolating device for steam leakage and blowing of steam seal of steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321915759.3U CN220451989U (en) | 2023-07-20 | 2023-07-20 | Sealing and isolating device for steam leakage and blowing of steam seal of steam turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220451989U true CN220451989U (en) | 2024-02-06 |
Family
ID=89733165
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321915759.3U Active CN220451989U (en) | 2023-07-20 | 2023-07-20 | Sealing and isolating device for steam leakage and blowing of steam seal of steam turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220451989U (en) |
-
2023
- 2023-07-20 CN CN202321915759.3U patent/CN220451989U/en active Active
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