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

An ultra-supercritical and steam turbine technology, applied in the field of surfacing welding, can solve the problems of mechanical adhesion and wear of the rotor journal and bearing surface, friction pair mismatch, etc., to reduce technology dependence, ensure smooth operation, and increase economic benefits.

Active Publication Date: 2010-09-22
HARBIN TURBINE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 of the ultra-supercritical unit does not match with the bearing bush Babbitt alloy, and mechanical adhesive wear easily occurs on the rotor journal and the surface of the bearing , and then provides a surfacing welding method for 12%Cr steel high and medium pressure rotor journals of ultra-supercritical steam turbines

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 1: Combination figure 1 with figure 2 To describe this embodiment, this embodiment is implemented through the following steps:

[0014] Step 1. According to the groove shape, size and finish requirements of the drawing, the blank rotor 1 (12%Cr steel rotor, material 14Cr10.5Mo1W1NiVNbN, chemical composition is shown in Table 1, 14 represents the carbon content, and the number after the element symbol represents The approximate content of the element) of the first journal 1-1 and the second journal 1-2 are respectively processed by groove turning, and the first bearing centerline a is determined based on the turning reference plane A, and the first bearing centerline a is the ring groove 1 with a turning length of 432mm at the center, and the turning thickness is 20mm. Both sides of the ring groove 1 are processed with grooves to obtain the first surface to be surfacing 1-1-1; it is determined based on the turning reference plane B The second...

specific Embodiment approach 2

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

specific Embodiment approach 3

[0022] Specific implementation mode three: combination figure 1 with figure 2 This embodiment will be described. In the surfacing process of step 5, during the intermittent time period of the surfacing welding work, the first surfacing surface 1-1-1 and the second surfacing surface 1-1-1 of the unfinished blank rotor 1 will be explained. The surface to be surfacing 1-2-1 is kept at a temperature of 260℃~320℃. Due to the large amount of surfacing welding, the surfacing of one end of the shaft journal of the blank rotor 1 cannot be completed in one working day. The surfacing work is stopped at night, and the surfacing will continue on the second working day. The heat preservation of the blank rotor 1 can prevent Cracks appear at the surfacing weld, thereby improving the quality of surfacing welding. The other steps and parameters are the same as in the first or second embodiment.

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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 hig...

Claims

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Application Information

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Patent Type & Authority Applications(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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