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Site high-speed dynamic balance method for large steam turbine generator unit shafting

A turbogenerator set, high-speed dynamic balancing technology, applied in the field of high-speed dynamic balancing, can solve problems such as aggravation

Inactive Publication Date: 2012-06-13
SHANDONG ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the balance weight to be added is calculated by solving the equation according to these influence coefficients, there will be a greater error
Therefore, in shafting balance, it is not appropriate to directly increase the weight based on the calculation results of methods such as the least square method

Method used

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  • Site high-speed dynamic balance method for large steam turbine generator unit shafting
  • Site high-speed dynamic balance method for large steam turbine generator unit shafting
  • Site high-speed dynamic balance method for large steam turbine generator unit shafting

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Experimental program
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Effect test

Embodiment Construction

[0048] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0049] figure 1 , Figure 2a, Figure 2b, image 3 In production, an on-site high-speed dynamic balancing method for the shafting of a large turbogenerator set includes the following steps:

[0050] 1) Make preparations for the start-up of the shafting of large turbogenerator sets;

[0051] 2) Start the shafting of the large turbo-generator set, measure the speed-up characteristics, and record the amplitude and phase of the shaft vibration of the shaft and the variation of the vibration amplitude and phase of each bearing with the speed;

[0052] 3) Determine which types of unbalances exist on the shafting according to the characteristics of the speed-up, namely: whether there are unbalances caused by the first-order vibration shape, the second-order vibration shape and the third-order vibration shape, as well as the unbalance of the extension end, and ...

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Abstract

The invention discloses a site high-speed dynamic balance method for a large steam turbine generator unit shafting. The site high-speed dynamic balance method is characterized by comprising the following steps of: 1) preparing to start the large steam turbine generator unit shafting; 2) starting the large steam turbine generator unit shafting, measuring an acceleration characteristic, and recording the change of the vibration of each bearing along with the rotating speed; 3) determining several types of unbalance of the shafting according to the acceleration characteristic, analyzing the unbalance, and determining a weight-increasing scheme; 4) analyzing the vibration after increasing the weight, namely measuring the vibration after increasing the weight for the first time; and 5) after increasing the weight, making corresponding fine adjustment by combining a fastened weight. According to the method, the dynamic balance weight can be added in trial and adjusted on a plurality of balance planes at a plurality of rotating speeds. By the method, mutual influence of the vibration among rotors is pre-quantified during weight adding; the working rotating speed and the critical rotating speed can be balanced at the same time, so that an effect of reducing the number of the balance starting time is outstanding; and the dynamic balance method for the steam turbine generator unit shafting is effective.

Description

technical field [0001] The invention relates to a high-speed dynamic balancing method, in particular to an on-site high-speed dynamic balancing method for the shaft system of a large turbogenerator set. Background technique [0002] In the on-site dynamic balance of the steam turbine generator set, the error of the influence coefficient is very random, especially for the bearing which is far away from the weighting plane, the influence coefficient is not accurate in most cases. If the method of solving the equation is used to find the balance weight to be added according to these influence coefficients, there will be a greater error. Therefore, in the shafting balance, it is not suitable to add weight directly according to the calculation results of the least square method and other methods. Only when the vibration of the unit has been greatly reduced after the trial weight is added, the calculation result is used as one of the means to determine the weight. Relevant exper...

Claims

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Application Information

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IPC IPC(8): G01M1/38
Inventor 马绿洲
Owner SHANDONG ELECTRIC POWER RES INST
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