A Boiler Fatigue Life Measurement Method Using Boiler Wall Temperature and Stress Measuring Device

Abstract

The invention relates to a boiler wall temperature and stress measurement device and a boiler fatigue life measurement method. Two thermoelectric couples and two strain gauges are stuck onto the outer wall and the inner wall of an upper barrel of a boiler; the thermoelectric couples are connected with a temperature data acquisition instrument by leads; the strain gauges are connected with a stress meter by leads. The device is characterized by being provided with a conduit and a sleeve, wherein the two ends of the conduit are provided with a flange (1) and a flange (2) respectively; the flange (1) is connected with a connecting flange of the upper barrel of the boiler in a sealing way; the bottom end of the sleeve is provided with a flange (3); the flange (2) is connected with the flange (3); the flange (3) is provided with small holes; the leads of the thermoelectric couple and the strain gauge which are arranged on the inner wall of the upper boiler barrel pass through the small holes; the flange (3) is welded with a thermoelectric couple metal shell to form a whole body so as to be sealed; a junction box is connected to the sleeve; the leads of the thermoelectric couple and the strain gauge which are arranged on the inner wall of the upper boiler barrel enter the junction box through the conduit and the sleeve.

Description

technical field [0001] The invention relates to a boiler wall temperature and stress measuring device and a boiler fatigue life testing method. Background technique [0002] The superior maneuverability of the ship can improve its survival rate in the future modern war. The superior maneuverability comes from the faster start-up and shutdown of the booster boiler unit and the variable load work. Larger load fluctuations will cause the wall temperature of the boiler drum and The rapid change of the medium pressure it bears will generate alternating thermal stress and mechanical stress. According to the theory of fatigue damage, frequent alternating stress will increase the fatigue damage of metal materials and shorten the service life of the drum. Therefore, it has become an important subject to study the fatigue life of marine supercharged boiler drum and monitor its safety and reliability. [0003] At present, many scholars at home and abroad have done a lot of research on...

AI Technical Summary

Problems solved by technology

Due to the difference in structure and working conditions, the data collection of marine boilers is more complicated and changeable, and the calculation method of temperature field is relatively different, so the traditional fatigue life monitoring system of power plant boilers is not suitable for marine boilers

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