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Method and vibration reduction device for center frame vibration reduction to adjust gas seal gap of steam turbine

A steam turbine and center frame technology, applied to mechanical equipment, engine components, machines/engines, etc., to achieve the effects of reducing steam leakage, reducing vibration, and maintaining stability

Inactive Publication Date: 2019-03-08
HUADIAN ENERGY COMPANY LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0033] The purpose of the present invention is to solve the problem that in the prior art, when reducing the air leakage loss at the top air seal of the steam turbine blade, it only adopts a passive response to the radial runout of the rotor, which will bring other unfavorable factors while achieving a certain effect

Method used

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  • Method and vibration reduction device for center frame vibration reduction to adjust gas seal gap of steam turbine
  • Method and vibration reduction device for center frame vibration reduction to adjust gas seal gap of steam turbine
  • Method and vibration reduction device for center frame vibration reduction to adjust gas seal gap of steam turbine

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specific Embodiment approach 1

[0041] Specific implementation mode one: the following combination Figure 6 to Figure 9 Specifically illustrate this embodiment, the method of this embodiment is realized through the following steps:

[0042] 1. Start the steam turbine; before starting, the gap t between the surface of the inner hole of the air seal assembly at the top of the moving blade of the steam turbine and the outer surface of the turbine blade is between 1.5 and 10 mm;

[0043] 2. After reaching the normal speed, adjust the centralizer assembly installed on the inner hole of the diaphragm, so that the three rollers on the centralizer assembly gradually approach the main shaft of the steam turbine to reduce the radial runout of the main shaft of the steam turbine; in the initial state, The distance between the surface of the roller 8-1 on the centralizer assembly and the surface of the steam turbine main shaft 9-3 can be 5 to 10 mm.

[0044] The centralizer assembly includes three rollers 8-1, three p...

specific Embodiment approach 2

[0050] Specific implementation mode two: the following combination Figure 6 and 8 This embodiment will be specifically described. This embodiment also includes two sets of distance sensors and one set of vibration sensors, and the first set of distance sensors 6-14 is arranged on the gas seal body to measure the gap between the gas seal body 6-11 and the outer surface of the steam turbine blade 6-12 in real time and the radial runout of the outer surface of the steam turbine blade 6-12; the second group of distance sensors 8-4 are respectively arranged at the front end of the push rod 8-2 to measure the distance between the roller 8-1 and the steam turbine main shaft 9-3 in real time and the radial runout of the steam turbine main shaft 9-3; a group of vibration sensors 8-5 are arranged at the front end of the push rod 8-2 to collect vibration data.

[0051] In the second step, the following technical means are also included. When the roller 8-1 approaches the steam turbine...

specific Embodiment approach 3

[0053] Specific implementation mode three: the following combination Figure 6 This embodiment will be specifically described. The third step of this embodiment also includes the following technical means. During the process of making the inner surface of the air seal assembly at the top of the moving blade close to the outer surface of the steam turbine blade 6-12, the air seal body 6-11 and the steam turbine blade 6 are collected in real time. -12 The gap on the outer surface and the radial runout on the outer surface of the steam turbine blade 6-12 and the vibration data collected by the vibration sensor 8-5, to ensure that the value of the gap t is always greater than the value of the radial runout, if the vibration data increases abnormally , then immediately reverse the action to increase the distance between the surface of the inner hole of the air seal assembly at the top of the rotor blade and the outer surface of the turbine blade, and resume operation when the vibra...

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Abstract

The invention relates to a method for adjusting the steam seal gap on the top of a movable vane of a steam turbine and a vibration attenuation device, in particular to a method for adjusting the steam seal gap of the steam turbine through center frame vibration attenuation and a vibration attenuation device. By the adoption of the method for adjusting the steam seal gap of the steam turbine through center frame vibration attenuation and the vibration attenuation device, the problems that when the steam leakage loss at the steam seal position of the top of the movable blade of the steam turbine is reduced at present, only passive response to radial runout of a rotor is adopted, and then other adverse factors are caused are solved. According to the technical scheme, after the steam turbine reaches a normal rotation speed, a centering device assembly arranged on an inner hole of a partition plate is adjusted so that three rollers on the centering device assembly can be gradually close to a main shaft of the steam turbine, and therefore the radial runout of the main shaft of the steam turbine is reduced; three push rods are flexible rods having an elastic compression in the length direction and are evenly distributed at the equal angle of 120 degrees in the plane perpendicular to the main shaft of the steam turbine; the rollers are arranged at the front ends of the push rods; and finally, the steam seal assembly on the top of the movable vane of the steam turbine is adjusted so that the surface of the inner hole of the steam seal assembly on the top of the movable vane is made to gradually gather to the outer surface of the vane of the steam turbine, and the gap formed between the surface of the inner hole and the outer surface of the vane of the steam turbine finally is 0.15-0.45 mm.

Description

technical field [0001] The invention relates to a method and a vibration damping device for adjusting the air seal gap at the top of a steam turbine rotor blade. Background technique [0002] A steam turbine is a power machine that converts the thermal energy of steam into mechanical energy. The stage is its most basic working unit. Structurally, each stage is composed of a nozzle and a moving blade cascade. After the steam enters the nozzle, its thermal energy is converted into Kinetic energy then enters the rotor blades, giving impact to the rotor blades, causing the impeller to rotate and output mechanical work. [0003] A large steam turbine is composed of multiple stages, and each stage is composed of dynamic and static parts, so the whole steam turbine is also composed of dynamic and static parts. There must be a certain gap between the rotating and stationary parts of the steam turbine to prevent mutual friction. Since there is a pressure difference between the insi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01D11/20
CPCF01D11/20
Inventor 常立宏王相军张聪
Owner HUADIAN ENERGY COMPANY LIMITED