High-pressure Cylinder of 330MW Turbine Based on Pearson's Coefficient and Multivariate Linear Fitting Quantitative Monitoring Method for Axial Expansion
The axial expansion of the high-pressure cylinder reflects the heating state of the turbine cylinder during operation,which is an important parameter to characterize the potential risk of abnormal dynamic and static friction and jamming of the slip-pin system in the unit,and it is also one of the key objects to be monitored during the operation of the unit.However,in practice,many units with long service time lack measurement points that can comprehensively reflect the axial cylinder expansion,and the quantitative analysis of axial cylinder expansion is also lacking in the existing studies.In this paper,for the actual situation of a 330MW turbine-generator unit,according to the mechanism of axial cylinder expansion on the slip-pin system,we designed a program to increase the number of measurement points and carried out the engineering implementation,and obtained the measurement data of the change of axial cylinder expansion at multiple ends.On this basis,a method based on Pearson's correlation coefficient and linear fitting of multivariate function is proposed to establish the equations of axial cylinder expansion at the left and right ends of the turbine with each high correlation measurement point.The quantitative analysis results show that the goodness of fit of the functions are all more than 0.998,respectively.Finally,a set of online monitoring system for axial cylinder expansion is designed,which can realize the real-time comprehensive monitoring of the key parameters,and is of great value and significance for the actual fault early warning.
turbine slip-pin systemaxial cylinder expansioncorrelation coefficientmultivariate function linear fitonline monitoring
维普
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