阅读说明：本技术 一种50mw单缸空冷光热汽轮机 (50MW single-cylinder air cooling photo-thermal steam turbine ) 是由 王龙洋 刘娇 彭理想 刘鑫 刘家根 魏红阳 高敏 杨志亮 于 2020-12-30 设计创作，主要内容包括：一种50MW单缸空冷光热汽轮机,它涉及汽轮机技术领域。本发明为解决现有50MW光热空冷汽轮机机组循环效率低、缸效率低,总体性能差,成本较高的问题。本发明包括前轴承箱、后轴承箱、高中低压合缸、转子总成、高压主汽阀、高压调节阀、中压主汽阀和中压调节阀,高压主汽阀和中压主汽阀分别设置在高中低压合缸的两侧,高压主汽阀的出汽端与高压调节阀的进汽端连接,高压调节阀的出汽端与高中低压合缸的主蒸汽进汽口连接,中压主汽阀的出汽端与中压调节阀的进汽端连接,中压调节阀的出汽端与高中低压合缸的中压蒸汽进汽口连通,转子总成与高中低压合缸之间由先至后依次设有高压通流和中低压通流。本发明用于蒸汽做功。(A50 MW single-cylinder air-cooling photo-thermal steam turbine relates to the technical field of steam turbines. The invention aims to solve the problems of low cycle efficiency, low cylinder efficiency, poor overall performance and higher cost of the existing 50MW photo-thermal air-cooling steam turbine unit. The high-pressure and medium-low pressure combined steam turbine comprises a front bearing box, a rear bearing box, a high-medium and low-pressure combined cylinder, a rotor assembly, a high-pressure main steam valve, a high-pressure regulating valve, a medium-pressure main steam valve and a medium-pressure regulating valve, wherein the high-pressure main steam valve and the medium-pressure main steam valve are respectively arranged on two sides of the high-medium and low-medium combined cylinder, the steam outlet end of the high-pressure main steam valve is connected with the steam inlet end of the high-pressure regulating valve, the steam outlet end of the high-pressure regulating valve is connected with the steam inlet of the main steam of the high-medium and low-pressure combined cylinder, the steam outlet end of the medium-pressure regulating valve is communicated with the medium-pressure steam inlet of the high-medium and low-pressure combined cylinder, and the high-medium and low-pressure combined. The invention is used for doing work by steam.)

1. The utility model provides a 50MW single cylinder air cooling light and heat steam turbine which characterized in that: the high-pressure, medium-pressure and low-pressure combined steam turbine comprises a front bearing box (1), a rear bearing box (2), a high-medium and low-pressure combined cylinder (3), a rotor assembly (4), a high-pressure main steam valve (5), a high-pressure regulating valve (6), a medium-pressure main steam valve (7) and a medium-pressure regulating valve (8), wherein the front bearing box (1) is arranged close to the high-pressure side of the high-medium and low-pressure combined cylinder (3), the rear bearing box (2) is arranged close to the low-pressure side of the high-medium and low-pressure combined cylinder (3), the rotor assembly (4) is sequentially arranged in the front bearing box (1), the high-medium and low-pressure combined cylinder (3) and the rear bearing box (2), the high-pressure main steam valve (5) and the medium-pressure main steam valve (7) are respectively arranged at two sides of the high-medium and low-pressure combined cylinder (3), the steam outlet end of the high-pressure main steam valve (5) is connected with the steam inlet end of, the steam outlet end of the medium-pressure main steam valve (7) is connected with the steam inlet end of the medium-pressure regulating valve (8), the steam outlet end of the medium-pressure regulating valve (8) is communicated with the medium-pressure steam inlet of the high-medium low-pressure combined cylinder (3), and a high-pressure through flow (9) and a medium-low pressure through flow (10) are sequentially arranged between the rotor assembly (4) and the high-medium low-pressure combined cylinder (3) from first to last.

2. The 50MW single-cylinder air-cooled photothermal turbine according to claim 1, wherein: the high-pressure through flow (9) comprises a 1-stage regulating stage and a 14-stage pressure stage, and the medium-low pressure through flow (10) comprises a 17-stage pressure stage.

3. The 50MW single-cylinder air-cooled photothermal turbine according to claim 1, wherein: the high-pressure regulating valve (6) is communicated with the high-medium low-pressure combined cylinder (3) through two high-pressure steam inlet air guide pipes (11), two parts of the top and the bottom of the high-medium low-pressure combined cylinder (3) are respectively provided with a main steam inlet, a high-pressure steam inlet insertion pipe (12) is arranged on the main steam inlet, one high-pressure steam inlet air guide pipe (11) is communicated with the high-pressure steam inlet insertion pipe (12) at the top of the high-medium low-pressure combined cylinder (3), the other high-pressure steam inlet air guide pipe (11) is communicated with the high-pressure steam inlet insertion pipe (12) at the bottom of the high-medium low-pressure combined cylinder (3), the medium-pressure regulating valve (8) is communicated with the high-medium low-medium combined cylinder (3) through two medium-pressure steam inlet air guide pipes (13), the bottom of the high-medium low-medium-pressure combined cylinder (3) is provided with two medium-pressure steam inlet openings, a medium-pressure steam inlet insertion pipe (14) is arranged on.

4. The 50MW single-cylinder air-cooled photo-thermal turbine as claimed in claim 3, wherein: the steam outlet end of the high-pressure steam inlet air guide pipe (11) is provided with a plurality of adjusting stage nozzles, and the high-pressure steam inlet air guide pipe (11) is communicated with the high-pressure steam inlet inserting pipe (12) through the plurality of adjusting stage nozzles.

5. The 50MW single-cylinder air-cooled photothermal turbine according to claim 1, wherein: the rotor assembly (4) comprises a high-temperature section rotor and a low-temperature section rotor, and the high-temperature section rotor and the low-temperature section rotor are fixedly connected through bolts.

6. The 50MW single-cylinder air-cooled photothermal turbine according to claim 1, wherein: the heat recovery system of the steam turbine is 6-stage heat recovery, the heat recovery system is respectively connected with the bottoms of the high, medium and low pressure combined cylinders (3), and the heat recovery system comprises a 3-stage high-pressure heater, a 1-stage deaerator and a 2-stage low-pressure heater.

7. The 50MW single-cylinder air-cooled photothermal turbine according to claim 1, wherein: the front bearing box (1) and the rear bearing box (2) are arranged in a floor mode.

8. The 50MW single-cylinder air-cooled photothermal turbine according to claim 7, wherein: the front bearing box (1) is supported on the base frame by adopting a floor structure, the adjusting end of the high-medium-low pressure combined cylinder (3) is supported on the front bearing box (1) through a lower cat claw, and the cat claw is in sliding fit with the front bearing box (1).

9. The 50MW single-cylinder air-cooled photothermal turbine according to claim 8, wherein: the thrust bearing of the front bearing box (1) is provided with a relative expansion dead point of the rotor assembly (4), the rear end of the high, medium and low pressure combined cylinder (3) falls on the base frame, and the rear end of the high, medium and low pressure combined cylinder (3) is provided with an expansion absolute dead point.

10. The 50MW single-cylinder air-cooled photothermal turbine according to claim 1, wherein: the high, medium and low pressing cylinders (3) are of a double-layer cylinder body structure.

Technical Field

The invention belongs to the technical field of turbines, and particularly relates to a 50MW 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 existing 50MW 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 invention provides a 50MW single-cylinder air-cooling photothermal steam turbine, aiming at solving the problems of low cycle efficiency, low cylinder efficiency, poor overall performance and higher cost of the existing 50MW photothermal air-cooling steam turbine unit.

The technical scheme provided by the application for solving the problems is as follows:

it comprises a front bearing box, a rear bearing box, a high-medium-low pressure combined cylinder and a rotor assembly, the high-pressure main steam valve and the medium-pressure main steam valve are respectively arranged on two sides of the high-medium low-pressure fit cylinder, a steam outlet end of the high-pressure main steam valve is connected with a steam inlet end of the high-pressure adjusting valve, a steam outlet end of the high-pressure adjusting valve is connected with a main steam inlet of the high-medium low-pressure fit cylinder, a steam outlet end of the medium-pressure main steam valve is connected with a steam inlet end of the medium-pressure adjusting valve, a steam outlet end of the medium-pressure adjusting valve is communicated with a medium-pressure steam inlet of the high-medium low-pressure fit cylinder, and high-pressure and medium-low-pressure through flows are sequentially arranged between the rotor assembly and the high-medium low-pressure fit cylinder from first to last.

Compared with the prior art, the invention has the following beneficial effects:

1. the steam inlet parameter of the unit is 16.7MPa/566 ℃/566 ℃, and the circulation efficiency is fundamentally improved;

2. the unit is designed for combining the high-pressure cylinder, the medium-pressure cylinder and the low-pressure 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.

3. The steam inlet is adjusted by the nozzle, so that the quick load and steam inlet adjustment of the unit can be effectively guaranteed, the pressure after the adjustment stage is improved as much as possible, the working proportion of the adjustment stage is reduced, and the economy of the unit is improved.

4. The invention adopts the pre-twisted assembly structure for all the static blades and the movable blades of high pressure, medium pressure and low pressure except the low pressure last two-stage clapboard, and compared with the traditional welding clapboard, the assembly structure has no welding line, thereby avoiding welding deformation and better ensuring through-flow precision.

5. On the basis of meeting the needs to 50MW air cooling light and heat steam turbine, develop single cylinder steam turbine, this steam turbine jar is efficient, and the circulation efficiency is high, cost control is low. Can effectively improve the market competitiveness.

Drawings

FIG. 1 is a schematic longitudinal sectional view of the overall structure of the present invention;

FIG. 2 is a front view of the overall structure of the present invention;

FIG. 3 is a top view of FIG. 2;

FIG. 4 is a left side view of FIG. 2;

fig. 5 is a schematic view of the expansion of the present invention, wherein the direction of the open arrows indicates the direction of expansion of the rotor and the direction of the solid arrows indicates the direction of expansion of the cylinder.

Detailed Description

The first embodiment is as follows: the embodiment is described with reference to fig. 1 to 5, and the embodiment provides a 50MW single-cylinder air-cooled photo-thermal turbine, which comprises a front bearing box 1, a rear bearing box 2, a high-medium low-pressure combined cylinder 3, a rotor assembly 4, a high-pressure main steam valve 5, a high-pressure regulating valve 6, a medium-pressure main steam valve 7 and a medium-pressure regulating valve 8, wherein the front bearing box 1 is arranged close to the high-pressure side of the high-medium low-pressure combined cylinder 3, the rear bearing box 2 is arranged close to the low-pressure side of the high-medium low-pressure combined cylinder 3, the rotor assembly 4 is sequentially arranged in the front bearing box 1, the high-medium low-pressure combined cylinder 3 and the rear bearing box 2, the high-pressure main steam valve 5 and the medium-pressure main steam valve 7 are respectively arranged at two sides of the high-medium low-pressure combined cylinder 3, the steam outlet of the high-pressure main steam valve 5 is connected with the steam inlet of the high-pressure regulating valve 6, the steam outlet of the high-pressure regulating valve 6 is connected with the, the steam outlet end of the medium pressure regulating valve 8 is communicated with the medium pressure steam inlet of the high, medium and low pressure combination cylinder 3, and a high pressure through flow 9 and a medium and low pressure through flow 10 are sequentially arranged between the rotor assembly 4 and the high, medium and low pressure combination cylinder 3 from first to last.

In the embodiment, the steam inlet end of the high-pressure main steam valve 5 is communicated with a boiler superheater, and the steam inlet end of the medium-pressure main steam valve 7 is communicated with a boiler reheater.

In the embodiment, a high-pressure end steam seal is arranged on the high-pressure side of the high-medium low-pressure combination cylinder 3, and a low-pressure end steam seal is arranged on the low-pressure side of the high-medium low-pressure combination cylinder 3.

The high-medium-low pressure cylinder 3 comprises a high-pressure module, a medium-pressure module and a low-pressure module, a high-pressure through flow 9 is arranged in the high-pressure module, and a medium-low pressure through flow 10 is arranged in the medium-pressure module and the low-pressure module.

In the embodiment, two clapboards are installed at the end part of the rotor assembly 4 close to the rear bearing box 2, and the stator blades and the rotor blades are installed between the rotor assemblies 4 in the high-middle-low pressure combination cylinder 3 by adopting a pre-twisted assembly structure. Compared with the traditional welding partition plate, the assembly type structure has no welding line, avoids welding deformation and better ensures the through-flow precision.

The unit adopts the steam guide pipe design, and steam reentries high-pressure regulating valve 6 after high-pressure main steam valve 5, and every high-pressure regulating valve 6 back corresponds the regulation level nozzle of a certain quantity only, controls the main steam through the quantity of opening and the aperture of high-pressure regulating valve 6 and gets into the flow of high-pressure module. The steam flows through the high-pressure through-flow 9 and then flows out from a steam exhaust pipeline at the lower part of the high-pressure module; the steam reheated by the boiler enters a medium-pressure main steam valve 7 and a medium-pressure regulating valve 8, then enters a medium-pressure module, flows through a medium-low pressure through-flow 10, and then enters a condenser from a steam outlet at the lower part of a steam exhaust cylinder.

The second embodiment is as follows: the embodiment is described with reference to fig. 1 to 5, and provides a 50MW single-cylinder air-cooled photothermal turbine, wherein the high-pressure through flow 9 comprises 1-stage regulation stage and 14-stage pressure stage, and the medium-low pressure through flow 10 comprises 17-stage pressure stage. Other components and connection modes are the same as those of the first embodiment.

The third concrete implementation mode: the embodiment is described with reference to fig. 1 to 5, and provides a 50MW single-cylinder air-cooled photothermal turbine, the high-pressure regulating valve 6 is communicated with the high-medium low-pressure combined cylinder 3 through two high-pressure steam inlet air guide pipes 11, two parts of the top and the bottom of the high-medium low-pressure combined cylinder 3 are respectively provided with a main steam inlet, the main steam inlet is respectively provided with a high-pressure steam inlet insertion pipe 12, one high-pressure steam inlet air guide pipe 11 is communicated with the high-pressure steam inlet insertion pipe 12 at the top of the high-medium low-pressure combined cylinder 3, the other high-pressure steam inlet air guide pipe 11 is communicated with the high-pressure steam inlet insertion pipe 12 at the bottom of the high-medium low-pressure combined cylinder 3, the medium-pressure regulating valve 8 is communicated with the high-medium low-pressure combined cylinder 3 through two medium-pressure steam inlet air guide pipes 13, the bottom of the high-medium low-pressure combined cylinder 3 is provided with two medium-pressure steam inlets, the medium-pressure steam. Other components and connection modes are the same as those of the first embodiment.

The fourth concrete implementation mode: the embodiment is described with reference to fig. 1 to 5, and provides a 50MW single-cylinder air-cooled photothermal steam turbine, wherein a plurality of regulating stage nozzles are arranged at the steam outlet end of the high-pressure steam inlet gas guide pipe 11, and the high-pressure steam inlet gas guide pipe 11 is communicated with the high-pressure steam inlet insertion pipe 12 through the plurality of regulating stage nozzles. Other components and connection modes are the same as those of the third embodiment.

The fifth concrete implementation mode: the embodiment is described with reference to fig. 1 to 5, and provides a 50MW single-cylinder air-cooled photothermal steam turbine, wherein the rotor assembly 4 comprises a high-temperature section rotor and a low-temperature section rotor, and the high-temperature section rotor and the low-temperature section rotor are fixedly connected through bolts. Other components and connection modes are the same as those of the first embodiment.

The high-temperature section rotor is arranged in the high-pressure module and the middle-pressure module, the low-temperature section rotor is arranged in the low-pressure module, the front section and the rear section have different mechanical properties, 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.

The sixth specific implementation mode: the embodiment is described with reference to fig. 1 to 5, and provides a 50MW single-cylinder air-cooled photothermal steam turbine, wherein a heat regeneration system of the steam turbine is 6-stage heat regeneration, the heat regeneration system is respectively connected with the bottoms of high, medium and low pressure combined cylinders 3, and the heat regeneration system comprises a 3-stage high-pressure heater, a 1-stage deaerator and a 2-stage low-pressure heater. Other components and connection modes are the same as those of the first embodiment.

In the embodiment, the unit adopts a nozzle-regulated steam inlet mode and has the capability of quickly regulating the load, the high-pressure through flow 9 of the unit is provided with a 1-level regulation level and a 14-level pressure level, and the medium-low pressure through flow 10 of the unit is provided with a 17-level pressure level. The heat regeneration system has 6 levels, namely a 3-level high-pressure heater, a 1-level deaerator and a 2-level low-pressure heater, and the cycle efficiency of the unit is greatly improved through multi-level heat regeneration.

The seventh embodiment: the embodiment is described with reference to fig. 1 to 5, and provides a 50MW single-cylinder air-cooled photothermal turbine, wherein the front bearing box 1 and the rear bearing box 2 are both arranged on the ground. Other components and connection modes are the same as those of the first embodiment.

The rear bearing box 2 is arranged on the ground, so that the clearance between a low-pressure end steam seal arranged on the rear bearing box and the rotor is not influenced by the deformation and the temperature of the low-pressure cylinder.

The specific implementation mode is eight: the embodiment is described with reference to fig. 1 to 5, and provides a 50MW single-cylinder air-cooled photothermal steam turbine, wherein the front bearing box 1 is supported on the base frame by adopting a floor structure, the adjusting end of the high, medium and low pressure combined cylinder 3 is supported on the front bearing box 1 by a lower cat claw, and the cat claw is in sliding fit with the front bearing box 1. The other components and the connection mode are the same as those of the seventh embodiment.

The specific implementation method nine: the embodiment is described with reference to fig. 1 to 5, and provides a 50MW single-cylinder air-cooled photothermal turbine, wherein a thrust bearing of the front bearing box 1 is provided with a relative expansion dead point of the rotor assembly 4, the rear end of the high, medium and low pressure combined cylinder 3 falls on the base frame, and the rear end of the high, medium and low pressure combined cylinder 3 is provided with an expansion absolute dead point. Other components and connection modes are the same as those of the first embodiment.

The front bearing box bears the thrust bearing of the rotor, which is the relative dead point of the rotor, and 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 detailed implementation mode is ten: the embodiment is described with reference to fig. 1 to 5, and provides a 50MW single-cylinder air-cooled photothermal steam turbine, wherein the high-medium-low pressure cylinder 3 has a double-cylinder structure. Other components and connection modes are the same as those of the first embodiment.

The double-layer cylinder structure is suitable for the characteristics of the high-temperature working environment of the unit, and ensures that the cylinder body has good strength, good rigidity and small thermal stress.

Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.