Method and device for monitoring high-temperature oxide scales of generator set

Abstract

The invention provides a method and device for monitoring high-temperature oxide scales of a generator set. The method includes the steps of online monitoring the dissolved hydrogen content in an inlet of an economizer, an outlet of a steam separator, an outlet of a superheater and an outlet of a reheater in a steam-water system in the starting and running process of the generator set in real time; monitoring generator set parameters and water working condition parameters; collecting monitoring data, conducting analysis to set up a relation among the generator set parameters, the water working condition parameters and the change of dissolved hydrogen, and tracking and monitoring the corrosion and oxidization condition of the generator set in real time. By means of the method and the device, the dissolved hydrogen content in a vapor system of the running generator set can be online monitored in real time, the relation of the dissolved hydrogen change caused by operation of the generator set is set up, the corrosion and oxidization condition of the generator set is tracked and monitored in real time, operation in the starting and stopping process of the generator set and the generator set running working condition are optimized and adjusted according to data analysis of a corrosion and oxidization monitoring system, and corrosion and oxidization of the generator set are reduced to the maximum extent.

Description

technical field [0001] The invention relates to a method and a device for monitoring the condition of high-temperature scale of a generating set. Background technique [0002] With the increase of steam temperature and pressure, the efficiency of the boiler is greatly improved, and the coal consumption of power supply is reduced. However, some technical difficulties are encountered while increasing the steam parameters, mainly the performance of metal materials under high temperature and high pressure, especially the performance of materials Excellent resistance to high temperature corrosion and high temperature steam oxidation. Under the action of high-temperature steam, the oxidation of the metal wall is inevitable, thus forming a layer of oxide scale on the metal surface. These corrosion and oxidation products will pollute the quality of water vapor, enter the condensate water system, and become deposits in the easily scaled parts of thermal equipment. In addition, the p...

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Problems solved by technology

However, the magnetic field detection method also has its limitations

One is that it can only be used for the detection of scale generated by austenitic stainless steel pipes, and has low sensitivity to other non-austenitic pipes

The second is that the tested pipe samples can only be tested one by one after the unit is shut down to cool down, and it is impossible to monitor the growth rate of the scale in real time during the operation of the unit

This document mainly discusses the meaning, principle and method of measuring dissolved hydrogen in steam, but there is no complete metal corrosion and oxidation monitoring system, and only obtaining the dissolved hydrogen content cannot accurately reveal the corrosion and oxidation state of metals. Therefore, the technology disclosed in this document is rarely used in practice

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