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Surfacing method of 12-percent Cr steel high and middle pressure rotor journal of ultra supercritical steam turbine

An ultra-supercritical, steam turbine technology, applied in the field of surfacing, can solve the problems of mechanical adhesion and wear of the rotor journal and bearing surface, and the mismatch of friction pairs, so as to reduce technical dependence, ensure smooth operation, and shorten the production cycle. Effect

Active Publication Date: 2012-06-06
HARBIN TURBINE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the friction pair formed by the 12% Cr steel high and medium pressure rotor journal and the bearing bush Babbitt alloy, the core component of the ultra-supercritical unit, does not match, and the problem of mechanical adhesive wear easily occurs on the rotor journal and the surface of the bearing , and then provides a surfacing method for ultra-supercritical steam turbine 12% Cr steel high and medium pressure rotor journal

Method used

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  • Surfacing method of 12-percent Cr steel high and middle pressure rotor journal of ultra supercritical steam turbine
  • Surfacing method of 12-percent Cr steel high and middle pressure rotor journal of ultra supercritical steam turbine
  • Surfacing method of 12-percent Cr steel high and middle pressure rotor journal of ultra supercritical steam turbine

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specific Embodiment approach 1

[0013] Specific implementation mode one: combine figure 1 with figure 2 Describe this implementation mode, this implementation mode is realized through the following steps:

[0014] Step 1. According to the groove shape, size and smoothness requirements of the drawing, the rough rotor 1 (12% Cr steel rotor, material 14Cr10.5Mo1W1NiVNbN, the chemical composition is shown in Table 1, 14 represents the carbon content, and the number behind the element symbol represents The approximate content of this element) the first journal 1-1 and the second journal 1-2 are respectively grooved, and the first bearing center line a is determined based on the first turning datum plane A, and the first bearing The center line a is an annular groove 1 with a center turning length of 432 mm and a turning thickness of 20 mm. Bevels are processed on both sides of the annular groove 1 to obtain the first surface to be surfacing 1-1-1; take the second turning reference plane Determine the center li...

specific Embodiment approach 2

[0021] Specific implementation mode two: combination figure 1 with figure 2 To illustrate this embodiment, it also includes step 8, said step 8 conducts non-destructive testing on the first surfacing surface 2-1 and the second surfacing surface 2-2 of the blank rotor 1 after turning and finishing in step 7. (Ultrasonic inspection: no linear defects and dense circular defects display, there can be a single circular defect of φ<3.0mm; surface penetration inspection: no linear defects, there can be circular defects of φ<1.0mm), other steps and parameters It is the same as the first embodiment.

specific Embodiment approach 3

[0022] Specific implementation mode three: combinationfigure 1 with figure 2 This embodiment will be described. In this embodiment, in the surfacing process of step 5, during the interval of surfacing work, the first surface to be surfacing 1-1-1 and the second The surface to be surfacing 1-2-1 is kept warm at a temperature of 260°C to 320°C. Due to the heavy workload of surfacing welding, the surfacing work of the shaft journal at one end of the blank rotor 1 cannot be completed in one working day, and the surfacing work is stopped at night, and the surfacing welding will continue on the second working day. Cracks appear at the surfacing welding place, thereby improving the surfacing welding quality. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention relates to a surfacing method, in particular to a surfacing method of a 12-percent Cr steel high and middle pressure rotor journal of an ultra supercritical steam turbine, solving the problem of mechanical adhesive wear of the surfaces of the 12-percent Cr steel high and middle pressure rotor journal and a bearing. The surfacing method comprises the following steps of: firstly, respectively turning a first journal and a second journal of a blank rotor in a groove mode; secondly, carrying out dye inspection on a turning surface; thirdly, assembling the blank rotor to a special surfacing device; fourthly, preheating a surface to be surfaced of the rotor journal; fifthly, surfacing the surface to be surfaced; sixthly, distressing and heating a rotor; seventhly, turning and finishing the surfaced rotor; and eighthly, carrying out nondestructive inspection detection on the finished rotor. The surfacing method is used for surfacing the 12-percent Cr steel high and middle pressure rotor of the ultra supercritical steam turbine.

Description

technical field [0001] The invention relates to a surfacing welding method, in particular to a surfacing welding method for a 12% Cr steel high and medium pressure rotor journal of an ultra-supercritical steam turbine. Background technique [0002] The development of large-scale ultra-supercritical units is an inevitable choice for the development of clean coal power generation technology in my country. It is the most realistic and effective way to improve the thermal efficiency of units, improve environmental protection and optimize the installed structure of thermal power in my country. The 12% Cr steel high and medium pressure rotor is the core component of the ultra-supercritical unit, and a series of difficulties must be overcome in the manufacturing process, especially the journal wear problem. The improved 12% Cr steel and the new 12% Cr steel used for the ultra-supercritical steam turbine rotor When Cr steel is applied to high and medium pressure rotors that require ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/04B23K9/18B23K9/095B23K9/235B23K9/23
Inventor 陈丽娟刘立辉刘长江李全华张仁军张旭磊宋雪梅马晓梅王舜王金刚焦俊锋
Owner HARBIN TURBINE
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