Steam passage sealing method for steam turbine through-flow portion

A technology for steam turbines and flow parts, which is applied to mechanical equipment, engine components, machines/engines, etc., and can solve problems such as reduced unit efficiency, larger flow gaps, and height loss of steam seal teeth, achieving reduced height loss and excellent performance. High temperature resistance performance, the effect of improving work efficiency

Inactive Publication Date: 2017-12-22
HARBIN TURBINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problems that the height of the steam seal teeth is lost during the scraping process, the flow gap becomes larger, and the efficiency of the unit is reduced in the existing steam circuit sealing method. road closure method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0014] Specific embodiment 1: A method for sealing the steam path of the steam turbine flow part described in this embodiment, the method is:

[0015] The stator parts of the high, medium and low pressure passage parts of the steam turbine are sealed with an abradable sealing coating, and the steam seal teeth are arranged between the adjacent two-stage moving blades of the steam turbine and at the end of the steam seal.

[0016] In this embodiment, in order to improve the sealing efficiency of the steam circuit in the flow part of the steam turbine, improve the flow gap, and achieve the purpose of improving the efficiency of the unit, an abradable sealing coating is applied to the stator parts of the high, medium and low pressure flow parts of the steam turbine. The steam seal teeth are inlaid or turned on the top. In this way, when the unit is running, the abradable sealing coating and the steam seal teeth are scraped and rubbed against each other. After the two are scraped, ...

specific Embodiment approach 2

[0017] Specific embodiment 2: This embodiment is a further description of a method for sealing the steam path of the steam turbine flow part described in the specific embodiment 1. In this embodiment, the high, medium and low pressure flow parts of the steam turbine The stator cover is: diaphragm stator vane top shroud, steam seal ring and steam seal arc section.

specific Embodiment approach 3

[0018] Specific embodiment three: this embodiment is a further description of a method for sealing the steam path of a steam turbine flow part described in specific embodiment one. In this embodiment, the abradable sealing coating includes a NiCrAlY bottom layer and NiCrFeAl / hBN / SiO 2 Surface layer.

[0019] In this embodiment, the NiCrAlY bottom layer and NiCrFeAl / hBN / SiO2 surface layer are sprayed on the stator part of the flow part of the steam turbine, and a reasonable coating thickness is designed at the flow position to calculate and define the properties of the coating such as hardness, bonding force and porosity. Index, calculate and reserve the gap, so that the unit will maintain a small gap after the coating and the seal teeth are scraped under the operating environment, and at the same time, the abradable coating system will not be peeled off, corroded and oxidized.

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Abstract

The invention discloses a steam passage sealing method for a steam turbine through-flow portion and relates to the technical field of steam passage sealing of the steam turbine through-flow portion. In order to solve the problems that in existing steam passage sealing methods, height loss happens to steam sealing teeth in the scraping process, the through-flow clearance is larger, and the unit efficiency is decreased, the steam passage sealing method for the steam turbine through-flow portion is provided. The steam passage sealing method for the steam turbine through-flow portion includes the steps that an abradable sealing coating is applied to a stator portion sleeve of the high-pressure, medium-pressure and low-pressure through-flow portion of a steam turbine, and the steam sealing teeth are disposed between two stages of adjacent movable vanes of the steam turbine and in the end steam sealing position. The steam passage sealing method for the steam turbine through-flow portion is suitable for the field of steam passage sealing of the steam turbine through-flow portion.

Description

technical field [0001] The invention belongs to the technical field of sealing the steam path of the flow part of the steam turbine. Background technique [0002] The sealing technology of the flow part of the steam turbine mostly adopts inlaying or processing the seal teeth on the stator part (cylinder, diaphragm) to control the flow gap. When the rotor runs at high speed and high temperature, it will jump and expand, which will cause the rotor There is rubbing and scraping with the seal teeth. The disadvantage of this method of sealing the steam path is: in order to avoid damage to the rotor during the scraping process, the seal teeth should be sacrificed as much as possible to protect the rotor. The height is lost, the flow gap becomes larger, and the efficiency of the unit decreases. Contents of the invention [0003] The present invention aims to solve the problems that the height of the steam seal teeth is lost during the scraping process, the flow gap becomes large...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D11/02F01D9/02C23C4/073C23C4/134C23C4/06C23C4/129
CPCF01D11/02C23C4/06C23C4/073C23C4/129C23C4/134F01D9/02
Inventor 唐公民张宏涛张小伍刘新新高维瑾任贵龙张瑞武孙福民赵旭红徐国林
Owner HARBIN TURBINE
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