Solid particle erosion resistant steam turbine nozzle

A solid particle, steam turbine technology, applied in mechanical equipment, engine components, machines/engines, etc., can solve problems such as unsafe hazards, reduce unit efficiency, increase blade surface roughness and steam seal clearance, etc., to reduce maintenance costs, Erosion rate reduction and quantity reduction effect

Active Publication Date: 2010-05-12
HARBIN TURBINE +1
View PDF0 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Solid particle erosion resistant steam turbine nozzle
  • Solid particle erosion resistant steam turbine nozzle

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0007] Specific implementation mode one: (see Figure 1 ~ Figure 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 particle impact angle a of the pressure surface K of the regulating stage blade 2 is 9-11°.

specific Embodiment approach 2

[0008] Specific implementation mode two: (see figure 1 ) The outer diameter Φ of the nozzle inner ring 3 of this embodiment is 1040 mm. Other compositions and connections are the same as in the first embodiment.

specific Embodiment approach 3

[0009] Specific implementation mode three: (see figure 2 ) The axial width B of the regulating stage blade 2 in this embodiment is 76.49mm. Other compositions and connections are the same as in the first embodiment.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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 andtwo 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products