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Solid particle erosion resistant steam turbine nozzle

A technology of solid particles and steam turbines, applied in mechanical equipment, engine components, machines/engines, etc., can solve problems such as unsafe hidden dangers, reduced unit efficiency, increased blade surface roughness and steam seal clearance

Active Publication Date: 2006-02-08
HARBIN TURBINE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solid particle corrosion changes the shape of the moving blade and nozzle, increases the roughness of the blade surface and the seal gap, which not only reduces the efficiency of the unit, but also poses unsafe hazards. The solid particle corrosion of the high-pressure cylinder regulating stage blade is the most serious

Method used

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  • Solid particle erosion resistant steam turbine nozzle

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Experimental program
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Effect test

specific Embodiment approach 1

[0005] Specific Embodiment 1: (See Figures 1 to 3) This embodiment consists of a nozzle outer ring 1, an adjustment stage blade 2, and a nozzle inner ring 3. The nozzle inner ring 3 is arranged in the nozzle outer ring 1, and the adjustment stage blade 2 is fixed. Between the nozzle outer ring 1 and the nozzle inner ring 3, the space surrounded by the nozzle outer ring 1, the nozzle inner ring 3 and two adjacent regulating stage blades 2 forms a nozzle channel 4, and the solid of the pressure surface K of the regulating stage blade 2 The particle impact angle a is 9-11°.

specific Embodiment approach 2

[0006] Embodiment 2: (see FIG. 1 ) The outer diameter Φ of the nozzle inner ring 3 in this embodiment is 1040mm. Other compositions and connections are the same as in the first embodiment.

specific Embodiment approach 3

[0007] Embodiment 3: (See FIG. 2 ) The axial width B of the regulating stage blade 2 in this embodiment is 76.49 mm. Other compositions and connections are the same as in the first embodiment.

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PUM

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Abstract

The present invention is steam turbine nozzle resisting solid grain corrosion, relates to the improvement of nozzle structure for steam turbine, and aims at solving the problem of solid grain corrosion of steam turbine nozzle. The present invention has regulating stage blades fixed between inner nozzle ring and outer nozzle ring, nozzle passages formed with inner nozzle ring, outer nozzle ring and two adjacent regulating stage blades, and solid grain impact angle to the pressure surface of the regulating stage blades of 9-11 deg. The present invention has the solid grain impact angle to the pressure surface of the regulating stage blades greatly decreased from available technology, so as to avoid the high erosion area of the blade material and decrease the number of solid grains nozzle exit surface obviously. The present invention has less stage efficiency degradation each month and longer nozzle service life compared with available technology.

Description

Technical field: [0001] The invention relates to an improvement of the nozzle structure of a steam turbine. Background technique: [0002] Solid particle corrosion (Solid Particle Erosion) is one of the main reasons for the reduction of flow efficiency of supercritical thermal power steam turbine units. Due to the high temperature and high pressure characteristics of supercritical units, the corrosion of solid particles in steam turbine nozzles is common. Solid particles are iron oxide particles formed by ferrite alloys on the inner surface of boilers, heaters or steam pipes under the action of high temperature and high pressure steam. This kind of brittle oxide is formed at a certain point on the inner surface of the boiler, heater or steam pipe. After accumulating to a certain extent, it will peel off due to the instantaneous temperature change during the start-up and stop of the unit or the load change process, forming countless sharp corners. Hard particles, which pass...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D9/02
Inventor 杨其国李宇峰李殿成黄钢赵俊明姚宏伟
Owner HARBIN TURBINE
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