Supporting and hanging frame stress monitoring system for main steam line of thermal power generating unit

Abstract

The invention discloses a supporting and hanging frame stress monitoring system for a main steam line of a thermal power generating unit. The system comprises at least one optical fiber grating stress sensor which is arranged on a supporting and hanging frame of the main steam line and connected with an optical fiber sensing demodulation system through a transmission optical fiber, wherein the optical fiber grating of the optical fiber grating stress sensor covers a C wave band, and the strain monitoring range is between 0-2%; and the optical fiber sensing demodulation system consists of a wideband light source, a channel switching module, a spectrum analysis module and an embedded processing module. By utilizing the system, the stress condition of all supporting and hanging frames of the main steam line of the whole thermal power generating unit can be monitored in real time for a long time with accurate and effective monitoring data, reliable monitoring data can be provided, technicians in a power plant are helped to accurately hold the stress condition of the whole line, and the tightness degree of the supporting and hanging frame can be adjusted according to the actual stress to ensure that the line stress achieves a perfect state, so that great maintenance cost of the supporting and hanging frame can be saved, and the service life of the line is prolonged by improving the line stress.

Description

technical field [0001] The invention relates to the technical field of thermal power unit safety monitoring, in particular to a measurement and monitoring system for the stress condition of the support and hanger of the main steam pipe system of an ultra-supercritical unit. Background technique [0002] Thermal power plant ultra-supercritical unit and supercritical unit refer to the pressure of the working medium in the boiler. The working medium in the boiler is water, and the critical pressure of water is: 22.115MPA, 347.15°C; at this pressure and temperature, the density of water and steam is the same, which is called the critical point of water, and the working medium pressure in the furnace is low At this pressure, it is called a subcritical boiler. If the pressure is greater than this, it is a supercritical boiler. The steam temperature in the furnace is not lower than 593°C or the steam pressure is not lower than 31MPa, which is called ultra-supercritical. Supercriti...

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Problems solved by technology

[0005] The present invention aims to solve the current technical problem that the stress status of the main steam pipe system support and hanger of thermal power units cannot be detected and monitored, and provides a method for sensing the support and hanger of the main steam pipe system of ultra-supercritical units using optical fiber sensors based on optical fiber gratings. Stress changes, and then through the established main steam piping hanger material and mechanical model, the stress monitoring system for the structural safety state of the main steam piping hanger is obtained

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