Analysis of temperature field and thermal stress of hightemperature steam pipe elbow in startup stage

Abstract

Abstract:

To analyze the thermal stress of highpressure main steam pipe precisely,the elbow of highpressure main steam pipe in a gas turbine power plant was taken as the research object.According to the actual startup and shutdown curves of the turbine, the temperature field and thermal stress field of the elbow during cold startup were analyzed by limited element method.The results showed that the thermal stress of the elbow increased rapidly in the first 10 min of the startup stage, then increased steadily. The maximum stress lied on the neutral surface of the elbow, and the peak stress occurred at the last moment of steam temperature rise.With the stability of steam temperature, the thermal stress decreased rapidly.The results can provide reference for structural fatigue damage analysis.

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LIU Ming1，ZHU Weixiong2，DING Yongneng2，BAI Jia1.

Analysis of temperature field and thermal stress of hightemperature steam pipe elbow in startup stage [J]. Huadian Technology, 2019, 41(9): 18-21.

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Analysis of temperature field and thermal stress of hightemperature steam pipe elbow in startup stage

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