CN113982705A - 40MW ultrahigh-pressure high-rotation-speed single-cylinder air cooling steam turbine - Google Patents
40MW ultrahigh-pressure high-rotation-speed single-cylinder air cooling steam turbine Download PDFInfo
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- CN113982705A CN113982705A CN202111290407.9A CN202111290407A CN113982705A CN 113982705 A CN113982705 A CN 113982705A CN 202111290407 A CN202111290407 A CN 202111290407A CN 113982705 A CN113982705 A CN 113982705A
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- 238000001816 cooling Methods 0.000 title claims description 9
- 230000009467 reduction Effects 0.000 claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 238000003303 reheating Methods 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 230000003068 static effect Effects 0.000 claims description 2
- 230000001172 regenerating effect Effects 0.000 description 9
- 238000003466 welding Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 244000028952 catclaw acacia Species 0.000 description 1
- 235000004608 catclaw acacia Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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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
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/08—Cooling; Heating; Heat-insulation
- F01D25/12—Cooling
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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
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/08—Cooling; Heating; Heat-insulation
- F01D25/12—Cooling
- F01D25/125—Cooling of bearings
-
- 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
- F01D25/30—Exhaust heads, chambers, or the like
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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Abstract
The invention relates to a 40MW ultrahigh-pressure high-rotation-speed single-cylinder air-cooled steam turbine, which relates to an air-cooled steam turbine and aims to solve the problems of low cycle efficiency and high cost of the existing 40MW grade air-cooled steam turbine, the invention comprises a high-pressure rotor, a high-medium-pressure inner cylinder, a front bearing box, a high-pressure cylinder, a middle part of a cylinder, a low-pressure exhaust cylinder, a rear bearing box, a coupler, a reduction box, a generator, a front thrust supporting bearing and a rear bearing, wherein the front thrust supporting bearing is sleeved at the adjusting end of the high-pressure rotor and is installed in the front bearing box, the rear bearing is sleeved at the electric end of the high-pressure rotor and is installed in the rear bearing box, the high-medium-pressure inner cylinder is sleeved on the high-medium-pressure rotor, the middle part of the cylinder and the low-pressure exhaust cylinder are sequentially connected from left to right, the high-medium-pressure inner cylinder and the middle part of the cylinder are sleeved on the high-medium-pressure inner cylinder, the adjusting end of the high-pressure cylinder is supported on the front bearing box, and the low-pressure exhaust cylinder is connected with the rear bearing box, the electric end of the high-voltage rotor is connected with the reduction gearbox through the coupler, and the output shaft of the reduction gearbox is connected with the generator.
Description
Technical Field
The invention relates to an air cooling steam turbine, in particular to a 40MW ultrahigh-pressure high-rotating-speed single-cylinder air cooling steam turbine, and relates to the technical field of steam turbines.
Background
The 40 MW-grade air-cooled steam turbine in active service in China has the advantages of early forming design, low main steam parameter, unreasonable system design and structural design, high cost and the like, low unit circulation efficiency, high power supply coal consumption, low energy utilization rate and large pollution emission.
Disclosure of Invention
The invention provides a 40MW ultrahigh-pressure high-rotating-speed single-cylinder air cooling turbine, which aims to solve the problems of low cycle efficiency and high cost of the existing 40MW grade air cooling turbine.
The technical scheme adopted by the invention for solving the problems is as follows:
the invention comprises a high-pressure rotor, a high-medium pressure inner cylinder, a front bearing box, a high-pressure cylinder, a middle part of the cylinder, a low-pressure exhaust cylinder, a rear bearing box, a coupler, a reduction gearbox, a generator, a front thrust support bearing and a rear bearing, wherein the front thrust support bearing is sleeved at the adjusting end of the high-pressure rotor, the front thrust support bearing is installed in the front bearing box, the rear bearing is installed in the rear bearing box, the high-medium pressure inner cylinder is sleeved on the high-pressure rotor, the high-pressure cylinder, the middle part of the cylinder and the low-pressure exhaust cylinder are sequentially connected from left to right, the high-pressure cylinder and the middle part of the cylinder are sleeved on the high-medium pressure inner cylinder, the adjusting end of the high-pressure cylinder is supported on the front bearing box, the low-pressure exhaust cylinder is connected with the rear bearing box, the electric end of the high-pressure rotor is connected with the reduction gearbox through the coupler, and the output shaft of the reduction gearbox is connected with the generator.
Further, the high-pressure rotor is a monobloc forging rotor and is subjected to a segmented heat treatment process.
Furthermore, the 40MW ultrahigh-pressure high-rotation-speed single-cylinder air cooling steam turbine is provided with a five-stage regenerative design, the high-pressure cylinder is provided with a first regenerative design, a second regenerative design and a third regenerative design, the middle part of the cylinder is provided with a fourth-stage regenerative design, and the low-pressure exhaust cylinder is provided with a fifth-stage regenerative design.
Further, the 40MW ultrahigh-pressure high-rotating-speed single-cylinder air-cooled steam turbine further comprises a centering beam, and the high-pressure cylinder is connected with the front bearing box through the centering beam.
Further, the steam inlet mode of the high-medium pressure inner cylinder adopts 360-degree tangential volute steam inlet.
Further, the low-pressure exhaust cylinder and the rear bearing box are welded into a whole.
Furthermore, all the stator blades and the rotor blades of high pressure, medium pressure and medium pressure adopt a pre-twisting assembly type structure.
Furthermore, the high-pressure cylinder is provided with a high-pressure main steam adjusting combined valve, a steam inlet valve of the high-pressure main steam adjusting combined valve is directly connected with the high-pressure cylinder, the middle part of the cylinder is provided with a medium-pressure reheating adjusting combined valve, and a steam inlet valve of the medium-pressure reheating adjusting combined valve is directly connected with the middle part of the cylinder.
The invention has the beneficial effects that:
1. the invention can improve the steam inlet parameter of the unit to 13.24MPa/535 ℃/535 ℃, and basically improve the cycle efficiency;
2. the high-speed, high, medium and low-pressure combined cylinder design of the unit is adopted, the low-pressure exhaust cylinder exhausts steam downwards in a single side, and the rear bearing box is arranged on the ground, so that the influence of thermal expansion and vacuum change of the low-pressure outer cylinder on the center change of the inner cylinder is avoided. On the premise of ensuring high cycle efficiency and high safety of the unit, the length of the unit is shortened to the maximum extent, the floor area of the unit is reduced, the space is saved, and the construction cost of a power plant is reduced;
3. the unit adopts full-cycle steam admission, and the valve is directly connected with the cylinder, so that the steam admission loss is reduced to the maximum extent, more enthalpy drops are prevented from falling on impulse type adjusting levels with low efficiency, and the enthalpy drops are distributed on small enthalpy drop reaction pressure levels, so that higher level efficiency can be obtained;
4. all the static blades and the movable blades of the high-pressure and medium-pressure parts adopt pre-twisted assembly type structures, and compared with the traditional welding partition plate, the assembly type structures have no welding seams, so that welding deformation is avoided, and the through-flow precision is better ensured.
Drawings
FIG. 1 is a schematic longitudinal sectional view of the present invention;
FIG. 2 is a schematic diagram of the assembly arrangement of the present invention;
FIG. 3 is a top view of FIG. 2;
FIG. 4 is a side view of FIG. 2;
FIG. 5 is a solid side view of the high and medium pressure inner cylinder;
FIG. 6 is a top plan view of the high and medium pressure inner cylinder body;
FIG. 7 is a high pressure inlet volute CFD calculated Mach number distribution plot;
FIG. 8 is a cross-sectional flow diagram in a steam inlet volute CFD calculation.
Detailed Description
The first embodiment is as follows: the embodiment is described with reference to fig. 1 to 8, and the embodiment describes a 40MW ultrahigh-pressure high-rotation-speed single-cylinder air-cooled steam turbine, which comprises a high-pressure rotor 1, a high-medium-pressure inner cylinder 2, a front bearing box 3, a high-pressure cylinder 4, a cylinder middle part 5, a low-pressure exhaust cylinder 6, a rear bearing box 7, a coupling 8, a reduction gearbox 9, a generator 10, a front thrust support bearing 11 and a rear bearing 12, wherein the front thrust support bearing 11 is sleeved at the adjusting end of the high-pressure rotor 1, the front thrust support bearing 11 is installed in the front bearing box 3, the rear bearing 12 is sleeved at the electric end of the high-pressure rotor 1, the rear bearing 12 is installed in the rear bearing box 7, the high-medium-pressure inner cylinder 2 is sleeved on the high-pressure rotor 1, the high-pressure cylinder 4, the cylinder middle part 5 and the low-pressure exhaust cylinder 6 are sequentially connected from left to right, the high-pressure cylinder 4 and the cylinder middle part 5 are sleeved on the high-medium-pressure inner cylinder 2, the adjusting end of the high-medium-pressure cylinder 4 is supported on the front bearing box 1, the low-pressure exhaust cylinder 6 is connected with the rear bearing box 7, the electric end of the high-pressure rotor 1 is connected with the reduction gearbox 9 through the coupler 8, and the output shaft of the reduction gearbox 9 is connected with the generator 10.
The front bearing box 3 is supported on the base frame by adopting a floor structure, the adjusting end of the high-pressure cylinder 4 is supported on the front bearing box 1 through a lower cat claw, and the lower half of the high-pressure cylinder 4 is provided with a centering beam which is axially fixed with the bearing box; the adjusting end of the middle part 5 of the cylinder is fixedly connected with the high-pressure cylinder 4 through a vertical flange, and the electric end of the cylinder is fixedly connected with the low-pressure exhaust cylinder 6 through a vertical flange. The high and medium pressure inner cylinder 2 is a high and medium pressure integral inner cylinder. The rear bearing housing 7 is supported on the base frame. The adjusting end of the high-voltage rotor 1 is supported on a front bearing 11, and the electric end of the middle-low voltage rotor 2 is supported on a rear bearing 12; the turbine rotor adopts high-speed design, and is output to the generator 10 after being decelerated by the reduction box 9.
The absolute dead point of the unit of the embodiment is designed at the rear base frame of the low-pressure exhaust cylinder 6 and is the expansion absolute dead point of the whole unit. The reduction gearbox 9 is fixed on the foundation through a base frame, and a thrust support bearing is arranged in the reduction gearbox 9 and serves as an absolute dead point of a rotor of the reduction gearbox. The relative expansion dead point of the turbine rotor is designed at the thrust bearing of the front bearing housing 3. During operation the cylinders 4, 5, 6 expand towards the tuning end, the cylinders push the front bearing housing 3 to slide by means of the centering beam 13, and the turbine rotor 2 expands towards the electrical end. A diaphragm coupling 8 is arranged between the turbine rotor 2 and the rotor of the reduction gearbox 9 and used for absorbing the expansion difference between the two rotors and the back wheel during the thermal state operation. The gear of the reduction box 9 adopts double helical teeth, and the thrust is self-balanced. The high-pressure double-layer cylinder structure is adopted at high pressure, the high-temperature working environment characteristics of the unit are adapted, the cylinder body is good in strength, good in rigidity and small in thermal stress, the high-pressure inner cylinder and the high-pressure outer cylinder are both cast, and the high-narrow flange structure is adopted, so that the requirement of quick start of the unit is met. The low-pressure exhaust cylinder 6 adopts a steel plate tailor-welded structure, and the rear bearing box 7 is arranged on the ground.
The second embodiment is as follows: the present embodiment will be described with reference to fig. 1 to 3, and the high-pressure rotor 1 according to the present embodiment is a monobloc forged rotor and a step heat treatment process. The high-pressure rotor and the middle-low pressure rotor are integrally forged rotors, a segmented heat treatment process is adopted, and the front section and the rear section have different mechanical properties, so that the high-temperature strength requirement of the high-temperature section is met, and the high-strength and low-brittleness transition temperature value performance of the low-temperature section is also met.
Other components and connections are the same as those in the first embodiment.
The third concrete implementation mode: the embodiment is described with reference to fig. 1, the 40MW ultrahigh pressure high rotating speed single cylinder air-cooled steam turbine is provided with a five-stage regenerative design, and the high pressure cylinder 4 is provided with a first, a second and a third-stage regenerative design; the middle and low pressure cylinders are provided with fourth and fifth grade regenerative designs. The 2 nd stage backheating is a deaerator.
Other components are connected in the same manner as in the first or second embodiment.
The fourth concrete implementation mode: the embodiment is described with reference to fig. 1, and the 40MW ultrahigh pressure high rotating speed single cylinder air-cooled steam turbine further includes a centering beam 13, and the high pressure cylinder 4 is connected with the front bearing housing 3 through the centering beam 13.
Other components and connection relationships are the same as those in the first, second or third embodiment.
The fifth concrete implementation mode: the present embodiment is described with reference to fig. 5 to 6, and the steam admission mode of the high and medium pressure inner cylinder 2 in the present embodiment adopts 360 ° tangential volute steam admission. The high-medium pressure integral inner cylinder adopts a 360-degree tangential volute steam inlet mode and transverse stationary blades to ensure the steam inlet efficiency.
Other components and connections are the same as those of the first, second, third or fourth embodiments.
The sixth specific implementation mode: the present embodiment will be described with reference to fig. 1, and the low pressure exhaust cylinder 6 and the rear bearing housing 7 of the present embodiment are welded integrally.
Other components and connection relationships are the same as those in the first, second, third, fourth or fifth embodiment.
The seventh embodiment: the present embodiment will be described with reference to fig. 1, and the high, medium, and high pressure stator blades and rotor blades of the present embodiment are all of the pre-twisted assembly type structure.
Other components and connection relationships are the same as those in the first, second, third, fourth, fifth or sixth embodiment.
The specific implementation mode is eight: referring to fig. 3, the high pressure cylinder 4 of the present embodiment is provided with a first steam inlet valve, and the first steam inlet valve is directly connected to the high pressure cylinder 4; and a second steam inlet valve is arranged in the middle part 5 of the cylinder and is directly connected with the middle part 5 of the cylinder.
Other components and connections are the same as those of the first, second, third, fourth, fifth, sixth, or seventh embodiments.
The working principle is as follows:
the front bearing box 3 is arranged on the ground, and the rear bearing box 7 and the low-pressure exhaust cylinder 6 are welded into a whole to save the length of a shaft system. The high-pressure rotor 1 adopts a segmented heat treatment process, and the material performance is fully utilized. The steam turbine adopts a high-rotating-speed design, and is output to the generator 10 after being decelerated by the reduction gearbox 9. The high-pressure rotor 1 is supported on a front thrust supporting bearing 11 and a rear bearing 12, and a diaphragm coupling 8 is used for absorbing shafting expansion difference. The unit adopts a design without a steam guide pipe, a steam inlet valve is directly connected with a cylinder, main steam enters a high-pressure main steam adjusting joint valve and then enters a high-pressure cylinder 4, and flows out of a steam exhaust pipeline at the lower part of a high-pressure outer cylinder 4 after flowing through a high-pressure through-flow; the steam reheated by the boiler enters the main reheating steam adjusting combined valve and then enters the middle part 5 of the cylinder, flows through the middle-low pressure through-flow and then enters the air-cooled condenser from the steam outlet at the lower part of the low-pressure steam exhaust cylinder 6.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. The utility model provides a 40MW superhigh pressure high rotational speed single cylinder air cooling steam turbine, it includes high-pressure rotor (1), high intermediate pressure inner casing (2), front bearing case (3), high pressure jar (4), cylinder middle part (5), low pressure exhaust casing (6), rear bearing case (7), shaft coupling (8), reducing gear box (9), generator (10), preceding thrust support bearing (11) and rear bearing (12), its characterized in that: the front thrust supporting bearing (11) is sleeved at the adjusting end of the high-pressure rotor (1), the front thrust supporting bearing (11) is installed in the front bearing box (3), the rear bearing (12) is installed in the rear bearing box (7) in a sleeved mode at the electric end of the high-pressure rotor (1), the high-medium-pressure inner cylinder (2) is sleeved on the high-pressure rotor (1), the high-pressure cylinder (4), the cylinder middle part (5) and the low-pressure exhaust cylinder (6) are sequentially connected from left to right, the high-pressure cylinder (4) and the cylinder middle part (5) are sleeved on the high-medium-pressure inner cylinder (2), the adjusting end of the high-pressure cylinder (4) is supported on the front bearing box (1), the low-pressure exhaust cylinder (6) is connected with the rear bearing box (7), the electric end of the high-pressure rotor (1) is connected with the reduction gearbox (9) through a coupler (8), and the output shaft of the reduction gearbox (9) is connected with the generator (10).
2. The 40MW ultra-high pressure high rotation speed single cylinder air-cooled steam turbine of claim 1, wherein: the high-pressure rotor (1) is a block forged rotor and is subjected to a segmented heat treatment process.
3. The 40MW ultra-high pressure high rotation speed single cylinder air-cooled steam turbine of claim 1, wherein: the utility model provides a 40MW ultrahigh pressure high rotational speed single cylinder air cooling steam turbine is equipped with five levels and regenerates the heat design, and high pressure jar (4) are equipped with first, two, three levels and regenerates the heat design, and cylinder middle part (5) are equipped with the fourth grade and regenerate the heat design, and low pressure exhaust cylinder (6) are equipped with the fifth level and regenerate the heat design.
4. The 40MW ultra-high pressure high rotation speed single cylinder air-cooled steam turbine of claim 1, wherein: the 40MW ultrahigh-pressure high-rotating-speed single-cylinder air-cooled steam turbine further comprises a centering beam (13), and the high-pressure cylinder (4) is connected with the front bearing box (3) through the centering beam (13).
5. The 40MW ultra-high pressure high rotation speed single cylinder air-cooled steam turbine of claim 1, wherein: the steam inlet mode of the high-medium pressure inner cylinder (2) adopts 360-degree tangential volute steam inlet.
6. The 40MW ultra-high pressure high rotation speed single cylinder air-cooled steam turbine of claim 1, wherein: the low-pressure exhaust cylinder (6) and the rear bearing box (7) are welded into a whole.
7. The 40MW ultra-high pressure high rotation speed single cylinder air-cooled steam turbine of claim 1, wherein: all the static blades and the movable blades of high pressure, medium pressure and medium pressure adopt a pre-twisted assembly type structure.
8. The 40MW ultra-high pressure high rotation speed single cylinder air-cooled steam turbine of claim 1, wherein: the high-pressure cylinder (4) is provided with a high-pressure main steam adjusting combined valve, a steam inlet valve of the high-pressure main steam adjusting combined valve is directly connected with the high-pressure cylinder (4), the middle part (5) of the cylinder is provided with a medium-pressure reheating adjusting combined valve, and the steam inlet valve of the medium-pressure reheating adjusting combined valve is directly connected with the middle part (5) of the cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111290407.9A CN113982705A (en) | 2021-11-02 | 2021-11-02 | 40MW ultrahigh-pressure high-rotation-speed single-cylinder air cooling steam turbine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111290407.9A CN113982705A (en) | 2021-11-02 | 2021-11-02 | 40MW ultrahigh-pressure high-rotation-speed single-cylinder air cooling steam turbine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115263452A (en) * | 2022-08-17 | 2022-11-01 | 东方电气集团东方汽轮机有限公司 | Compact turbine cylinder |
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| US20210140347A1 (en) * | 2018-04-17 | 2021-05-13 | Lidao ZHANG | Double-reheat power generator with an ultra high pressure cylinder and a high-intermediate pressure cylinder each having additional heat recovery turbine stages |
| CN215907927U (en) * | 2021-11-02 | 2022-02-25 | 哈尔滨汽轮机厂有限责任公司 | 40MW ultrahigh-pressure high-rotation-speed single-cylinder air cooling steam turbine |
-
2021
- 2021-11-02 CN CN202111290407.9A patent/CN113982705A/en active Pending
Patent Citations (6)
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|---|---|---|---|---|
| US20130216354A1 (en) * | 2012-02-17 | 2013-08-22 | Takashi Maruyama | Single-casing steam turbine and combined cycle power plant of single-shaft type |
| US20210140347A1 (en) * | 2018-04-17 | 2021-05-13 | Lidao ZHANG | Double-reheat power generator with an ultra high pressure cylinder and a high-intermediate pressure cylinder each having additional heat recovery turbine stages |
| CN109162765A (en) * | 2018-08-23 | 2019-01-08 | 哈尔滨汽轮机厂有限责任公司 | A kind of high revolving speed steam turbine of resuperheat of super-pressure 45MW |
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| CN115263452A (en) * | 2022-08-17 | 2022-11-01 | 东方电气集团东方汽轮机有限公司 | Compact turbine cylinder |
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Effective date of registration: 20230113 Address after: 150000 building 3, high tech production base, Nangang District, Harbin City, Heilongjiang Province Applicant after: HARBIN TURBINE Co.,Ltd. Applicant after: HADIAN POWER EQUIPMENT NATIONAL ENGINEERING RESEARCH CENTER CO.,LTD. Address before: 150046 No. three power road 345, Xiangfang District, Heilongjiang, Harbin Applicant before: HARBIN TURBINE Co.,Ltd. |