Online monitoring method for fouling degree of flow passage of steam turbine

Abstract

The invention relates to an online monitoring method for fouling degree of a flow passage of a steam turbine, which is characterized by comprising the links of data acquisition, main steam flow calculation, back-heating system parameter correction and diagnosis of the fouling degree of the flow passage, and comprising the following steps of: for each middle group, comparing the front and back pressure ratio of each group obtained by online monitoring with the front and back pressure ratio of each group when the flow passage is in a normal state by using the current back-heating extraction pressure measuring point of each level in the running of the steam turbine through the links so as to judge the fouling state of the flow passage of each middle group of the steam turbine; for the final group, comparing the pressure before the final group obtained by online monitoring with the pressure before the final group of the steam turbine under the condition of the same main steam flow so as to judge the fouling condition of the flow passage area of the final group of the steam turbine and realize the online diagnosis of the fouling degree of the whole flow passage of the steam turbine. The invention has the advantage of scientific method, and can realize automatic online monitoring and accurate judgment, and the like.

Description

technical field [0001] The invention relates to the field of state monitoring and fault diagnosis of thermal equipment, and is an accurate on-line monitoring method for the fouling degree of the flow part of a steam turbine. Background technique [0002] With the development of my country's thermal power units in the direction of high parameters and large capacity, especially the operation of large-capacity once-through boilers and super (super) critical units, it is difficult to control high steam quality. At the same time, due to the increase of the steam pressure of the super (super) critical unit, the solubility of salts in the steam increases, which further increases the difficulty of boiler desalination. When the steam with salt dissolved enters the steam turbine to do work, due to the pressure drop, the salt dissolved in the steam precipitates and deposits in the flow part of the steam turbine, causing fouling in the flow part of the steam turbine, resulting in change...

AI Technical Summary

Problems solved by technology

However, when determining the relationship between fouling in the through-flow part and the thermal state parameters, not only the scaling thickness ratio coefficients at all levels need to be determined in advance, but also the average thickness of the fouling in the through-flow part of the steam turbine needs to be determined in advance. It is difficult to accurately determine the mean

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