CN112696237A - 135MW single-cylinder air cooling photo-thermal steam turbine - Google Patents
135MW single-cylinder air cooling photo-thermal steam turbine Download PDFInfo
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- CN112696237A CN112696237A CN202011641858.8A CN202011641858A CN112696237A CN 112696237 A CN112696237 A CN 112696237A CN 202011641858 A CN202011641858 A CN 202011641858A CN 112696237 A CN112696237 A CN 112696237A
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Abstract
The invention belongs to the technical field of steam turbines, in particular to a 135MW single-cylinder air-cooled photo-thermal steam turbine, which mainly comprises a high-pressure main steam valve, a high-pressure regulating valve, a medium-pressure main steam valve, a medium-pressure regulating valve, a front bearing box, a rear bearing box, a high-medium-low pressure cylinder combining module and the like, wherein the front bearing box is arranged in a grounding way, a single dead point is arranged, the rear bearing box is arranged in a grounding way, so that the gap between a low-pressure end steam seal and a rotor arranged on the rear bearing box is ensured not to be influenced by the deformation and the temperature of a low-pressure cylinder, the low-pressure part is divided into a high-temperature area and a low-temperature area, two sections of rotors are tightly screwed by bolts, the material performance is fully utilized, the unit is designed for the high-medium-low pressure cylinder combining, the single-cylinder efficiency is high, the single side of a low-pressure, 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.
Description
Technical Field
The invention belongs to the technical field of turbines, and particularly relates to a 135MW single-cylinder air-cooling photo-thermal turbine.
Background
The steam turbine is also called as a steam turbine engine, and is a rotary steam power device.A high-temperature high-pressure steam passes through a fixed nozzle to become an accelerated airflow and then is sprayed onto blades, so that a rotor provided with blade rows rotates, and simultaneously, the rotor does work outwards. Steam turbines are the main equipment of modern thermal power plants, and are also used in the metallurgical industry, chemical industry and ship power plants.
The steam turbine is a rotating machine which takes steam as power and converts the heat energy of the steam into mechanical work, and is the most widely applied prime mover in modern thermal power plants. The steam turbine has the advantages of large single machine power, high efficiency, long service life and the like.
The existing 135MW photo-thermal air-cooling steam turbine is designed and formed earlier and has a large optimization space. In addition, the structural design is not reasonable, the unit has low circulation efficiency and cylinder efficiency, the overall performance is poor, and the cost is high.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides a 135MW single-cylinder air-cooling photothermal steam turbine, which aims to solve the problems of unreasonable structural design, low unit cycle efficiency, low cylinder efficiency, poor overall performance and higher cost of the existing 135MW photothermal air-cooling steam turbine.
In order to achieve the purpose, the MW single-cylinder air-cooled photo-thermal steam turbine comprises a high-pressure main steam adjusting combined valve, a medium-pressure reheating adjusting combined valve, a front bearing box, a rear bearing box and a cylinder;
the front end of the cylinder is connected with the front bearing box, the rear end of the rear cylinder is connected with the rear bearing box, the high-pressure main steam adjusting combined valve is arranged at the front end of the outer side of the cylinder, and the medium-pressure reheating adjusting combined valve is arranged in the middle of the outer side of the cylinder;
a rotor is arranged in the cylinder, the front end of the rotor is connected with the front bearing box, and the rear end of the rotor is connected with the rear bearing box;
the sealing mode of the front end of the rotor and the cylinder is end-adjusting steam seal, the sealing mode of the middle part of the rotor and the cylinder is balance drum steam seal, and the sealing mode of the rear end of the rotor and the cylinder is electric end steam seal;
and a blade is arranged between the rotor and the cylinder.
Furthermore, the high-pressure main steam adjusting combined valve is connected with the cylinder through a high-pressure air guide pipeline, and the medium-pressure reheating adjusting combined valve is connected with the cylinder through a medium-pressure air guide pipeline.
Still further, the rotor includes a high temperature stage rotor and a low temperature stage rotor; the rear end of the high-temperature section rotor is connected with the front end of the low-temperature section rotor.
Furthermore, the front end of the high-temperature section rotor is connected with the front bearing box through a thrust support combined bearing, and the rear end of the low-temperature section rotor is connected with the rear bearing box through a support bearing.
Still further, the vanes include high pressure vanes, intermediate pressure vanes, and low pressure vanes;
the high-pressure blade is arranged at the front end of the high-temperature section rotor, and the medium-pressure blade is arranged at the rear end of the high-temperature section rotor; the low-pressure blade is arranged on the outer side of the low-pressure section rotor;
and furthermore, a nozzle group is arranged on the steam inlet side of the adjusting stage moving blade and is connected with the high-pressure air guide pipeline.
Further, the high-pressure blades comprise twelve high-pressure vanes and twelve high-pressure blades;
the high-pressure stationary blades are arranged on the cylinder, and the high-pressure movable blades are arranged on the high-temperature section rotor;
the medium-pressure blades comprise eight medium-pressure stationary blades and eight medium-pressure movable blades;
the medium-pressure stationary blades are arranged on the cylinder, and the medium-pressure movable blades are arranged on the high-temperature section rotor.
Has the advantages that:
the steam inlet parameter of the unit is 16.7MPa/566 ℃/566 ℃, and the circulation efficiency is fundamentally improved;
the unit is designed to be a high-medium-low pressure combined cylinder, the single-cylinder efficiency is high, and the low-pressure exhaust cylinder exhausts steam downwards in a single-side mode. The shafting length is shortened, the unit length is shortened to the maximum extent on the premise of ensuring high cycle efficiency and high safety of the unit, the occupied area of the unit is reduced, the space is saved, and the construction cost of a power plant is reduced.
The machine set adopts the nozzle to adjust the steam inlet, thereby effectively ensuring that the machine set can quickly adjust the load and the steam inlet quantity, simultaneously improving the pressure behind the adjusting stage as much as possible, reducing the acting proportion of the adjusting stage and further improving the economical efficiency of the machine set.
Except for the low-pressure last two-stage partition plate, all other high, medium and low-pressure static blades and movable blades adopt pre-twisted assembly type structures, and compared with the traditional welding partition plate, the assembly type structure has no welding line, avoids welding deformation, and better ensures through-flow precision.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a principal intention of the present invention;
FIG. 2 is a top view of the present invention;
FIG. 3 is a left side view of the present invention;
fig. 4 is a front cross-sectional view of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In view of the problems of the prior art, the present invention provides a transverse cutting fixing device for a pipe sawing machine, which is described in detail below with reference to the accompanying drawings.
The first embodiment is as follows: a135 MW single-cylinder air-cooled photo-thermal steam turbine comprises a high-pressure main steam adjusting combined valve 1, a medium-pressure reheating adjusting combined valve 2, a front bearing box 3, a rear bearing box 4 and a cylinder 5;
the front end of the cylinder 5 is connected with the front bearing box 3, the rear end of the rear cylinder 5 is connected with the rear bearing box 3, the high-pressure main steam adjusting combined valve 1 is arranged at the front end of the outer side of the cylinder 5, and the medium-pressure reheating adjusting combined valve 2 is arranged in the middle of the outer side of the cylinder 5;
a rotor is arranged in the cylinder 5, the front end of the rotor is connected with the front bearing box 3, and the rear end of the rotor is connected with the rear bearing box 4;
the sealing mode of the front end of the rotor and the cylinder 5 is end-adjusting steam seal, the sealing mode of the middle part of the rotor and the cylinder 5 is balance drum steam seal, and the sealing mode of the rear end of the rotor and the cylinder 5 is electric end steam seal;
stationary blades are provided between the rotor and the cylinder 5.
In the embodiment, the high-pressure main steam regulating combined valve comprises a high-pressure main steam valve and a high-pressure regulating valve, and the medium-pressure main steam regulating combined valve comprises a medium-pressure main steam valve and a medium-pressure regulating valve.
Other embodiments are the same as the first embodiment.
The second embodiment is as follows: the high-pressure main steam adjusting combined valve 1 is connected with the cylinder 5 through a high-pressure air guide pipeline 6, and the medium-pressure reheating adjusting combined valve 2 is connected with the cylinder 5 through a medium-pressure air guide pipeline 7.
Other embodiments are the same as the first embodiment.
The third concrete implementation mode: the rotor comprises a high-temperature section rotor 8 and a low-temperature section rotor 9; the rear end of the high-temperature section rotor 8 is connected with the front end of the low-temperature section rotor 9.
Other embodiments are the same as the first embodiment.
The fourth concrete implementation mode: the front end of the high-temperature section rotor 8 is connected with the front bearing box 3 through a thrust support combined bearing 10, and the rear end of the low-temperature section rotor 9 is connected with the rear bearing box 4 through a support bearing 11.
Other embodiments are the same as the third embodiment.
The fifth concrete implementation mode: the vanes include high pressure vanes 12, medium pressure vanes 13, and low pressure vanes 14;
the high-pressure blades 12 are arranged at the front end of the high-temperature section rotor 8, and the medium-pressure blades 13 are arranged at the rear end of the high-temperature section rotor 8; the low pressure blades 14 are disposed outside the low temperature stage rotor 14.
The other embodiments are the same as the fourth embodiment.
The sixth specific implementation mode: and a nozzle group 16 is arranged on the steam inlet side of the adjusting-stage moving blade 15, and the nozzle group 16 is connected with a high-pressure steam guide pipeline.
The other embodiments are the same as the fifth embodiment.
The seventh embodiment: the high-pressure blades 12 include twelve high-pressure vanes and twelve high-pressure blades;
the high-pressure stationary blades are arranged on the cylinder 5, and the high-pressure movable blades are arranged on the high-temperature section rotor 8;
the medium pressure blades 13 comprise eight medium pressure stationary blades and eight medium pressure movable blades;
the medium pressure stator vanes are provided on the cylinder 5, and the medium pressure rotor vanes are provided on the high temperature stage rotor 8.
The other embodiments are the same as the sixth embodiment.
The working principle is as follows: this scheme mainly includes high pressure main steam valve, high pressure regulating valve, middling pressure main steam valve, middling pressure regulating valve, front bearing case, rear bearing case, high-medium low pressure close jar module etc.. The front bearing box is arranged on the ground, the independent dead point is arranged, and the rear bearing box is arranged on the ground, so that the clearance between the low-pressure end steam seal arranged on the front bearing box and the rotor is not influenced by the deformation and the temperature of the low-pressure cylinder. The low-pressure part is divided into a high-temperature area and a low-temperature area, and the two rotors are tightened by bolts, so that the material performance is fully utilized. The unit adopts the design of a steam guide pipe, steam enters a high-pressure regulating valve after passing through a high-pressure main steam valve, each high-pressure regulating valve is provided with a certain number of regulating stage nozzles, and the flow of the main steam entering a high-pressure cylinder is controlled by the opening number and the opening degree of the high-pressure regulating valves. The steam flows through the high-pressure through-flow and then flows out from the steam exhaust pipeline at the lower part of the high-pressure outer cylinder; the steam reheated by the boiler enters the main reheating steam valve and the reheating regulating valve and then enters the intermediate pressure cylinder, flows through the intermediate and low pressure through-flow and then enters the condenser through the steam outlet at the lower part of the steam exhaust cylinder.
The unit adopts a nozzle-regulated steam inlet mode, has the capability of quickly regulating load, and is provided with a 1-level regulation level and a 12-level pressure level for high-pressure through flow and a 14-level pressure level for medium-low pressure through flow. The heat recovery system has 7 levels, namely a 3-level high-pressure heater, a 1-level deaerator and a 3-level low-pressure heater, and the cycle efficiency of the unit is greatly improved through multi-level heat recovery.
The front bearing box is supported on the base frame by adopting a floor structure, the adjusting end is supported on the front bearing box through the lower cat claw, and the cat claw is in sliding fit with the front bearing box. The front bearing box bears the thrust bearing of the rotor, which is the relative dead point of the rotor. The low-pressure exhaust cylinder falls on the base frame. The middle and low pressure rotor 2 is a monobloc forging rotor and is connected by a flange bolt. The rear bearing box is arranged on the ground.
The absolute dead point of the unit is designed at the low-pressure exhaust cylinder and is the expansion absolute dead point of the whole unit. The relative expansion dead point of the turbine rotor is designed at the thrust bearing of the front bearing box. During operation, the high-medium and low-pressure cylinders expand towards the adjusting ends, the cylinders push the front bearing box to slide through the centering beam, and the turbine rotor expands towards the two ends by taking the thrust bearing as the center.
The high, medium and low pressure adopt a double-layer cylinder structure, the high-temperature working environment characteristic of the unit is adapted, and the cylinder body is good in strength, good in rigidity and small in thermal stress.
The high-pressure rotor, the medium-pressure rotor and the low-pressure rotor are integrally forged rotors, the high-temperature section and the low-temperature section of the medium-pressure rotor are tightened by bolts, 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.
Claims (7)
1. The utility model provides a 135MW single cylinder air cooling light and heat steam turbine which characterized in that: the device comprises a high-pressure main steam adjusting combined valve (1), a medium-pressure reheating adjusting combined valve (2), a front bearing box (3), a rear bearing box (4) and a cylinder (5);
the front end of the cylinder (5) is connected with the front bearing box (3), the rear end of the cylinder (5) is connected with the rear bearing box (3), the high-pressure main steam adjusting combined valve (1) is arranged at the front end of the outer side of the cylinder (5), and the medium-pressure reheating adjusting combined valve (2) is arranged in the middle of the outer side of the cylinder (5);
a rotor is arranged in the cylinder (5), the front end of the rotor is connected with the front bearing box (3), and the rear end of the rotor is connected with the rear bearing box (4);
the sealing mode between the front end of the rotor and the cylinder (5) is end-adjusting steam seal, the sealing mode between the middle part of the rotor and the cylinder (5) is balance drum steam seal, and the sealing mode between the rear end of the rotor and the cylinder (5) is electric end steam seal;
blades are arranged between the rotor and the cylinder (5).
2. The 135MW single-cylinder air-cooled photothermal turbine according to claim 1, wherein: the high-pressure main steam adjusting combined valve (1) is connected with the cylinder (5) through a high-pressure air guide pipeline (6), and the medium-pressure reheating adjusting combined valve (2) is connected with the cylinder (5) through a medium-pressure air guide pipeline (7).
3. The 135MW single-cylinder air-cooled photothermal turbine according to claim 1, wherein: the rotor comprises a high-temperature section rotor (8) and a low-temperature section rotor (9); the rear end of the high-temperature section rotor (8) is connected with the front end of the low-temperature section rotor (9).
4. The 135MW single-cylinder air-cooled photothermal turbine according to claim 3, wherein: the front end of the high-temperature section rotor (8) is connected with the front bearing box (3) through a thrust support combined bearing (10), and the rear end of the low-temperature section rotor (9) is connected with the rear bearing box (4) through a support bearing (11).
5. The 135MW single-cylinder air-cooled photothermal turbine according to claim 4, wherein: the blades comprise a high-pressure blade (12), a medium-pressure blade (13) and a low-pressure blade (14);
the high-pressure blade (12) is arranged at the front end of the high-temperature section rotor (8), and the medium-pressure blade (13) is arranged at the rear end of the high-temperature section rotor (8); the low-pressure blades (14) are arranged on the outer side of the low-temperature section rotor (9).
6. The 135MW single-cylinder air-cooled photothermal turbine according to claim 5, wherein: and a nozzle group (16) is arranged on the steam inlet side of the adjusting stage moving blade (15), and the nozzle group (16) is connected with the high-pressure air guide pipeline (6).
7. The 135MW single-cylinder air-cooled photothermal turbine according to claim 6, wherein: the high pressure blades (12) comprise twelve high pressure vanes and twelve high pressure blades; the high-pressure stationary blades are arranged on a cylinder (5), and the high-pressure movable blades are arranged on a high-temperature section rotor (8);
the medium pressure blades (13) comprise eight medium pressure stationary blades and eight medium pressure movable blades; the medium-pressure stationary vanes are arranged on a cylinder (5), and the medium-pressure movable vanes are arranged on a high-temperature section rotor (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011641858.8A CN112696237A (en) | 2020-12-31 | 2020-12-31 | 135MW single-cylinder air cooling photo-thermal steam turbine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011641858.8A CN112696237A (en) | 2020-12-31 | 2020-12-31 | 135MW single-cylinder air cooling photo-thermal steam turbine |
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| Publication Number | Publication Date |
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| CN112696237A true CN112696237A (en) | 2021-04-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011641858.8A Pending CN112696237A (en) | 2020-12-31 | 2020-12-31 | 135MW single-cylinder air cooling photo-thermal steam turbine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114776391A (en) * | 2022-03-31 | 2022-07-22 | 哈尔滨汽轮机厂有限责任公司 | 60MW reaction type high-temperature and high-pressure steam turbine adopting multistage small enthalpy drop blades |
-
2020
- 2020-12-31 CN CN202011641858.8A patent/CN112696237A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114776391A (en) * | 2022-03-31 | 2022-07-22 | 哈尔滨汽轮机厂有限责任公司 | 60MW reaction type high-temperature and high-pressure steam turbine adopting multistage small enthalpy drop blades |
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