Calculation And Experimental Study Of Strain-stress Of Thermal Equipment Of Power Plant

In this paper, the method of calculation of stress of thermal pipe is discussed, the measurement method of strain by resistance strain gauge is researched under the condition of room temperature and high temperature. In these experiments, a universal material testing machine is used. The step stress tensile tests are carried out and strain of different materials is measured by different strain gauges and different modes of connection. The specimens are heated through a heating unit and mesothermal tensile experiments are put. Lots of experimental data is acquired and it is analyzed. The main steam pipelines of No.5 generating unit of Zou Xian power plant are regarded as the research objects. According to different operating modes (the operating mode of designing, the operating mode of installation and the operating mode of invalidation etc.), the procedure of stress analysis of the pipeline is used to calculate the whole pipeline. The way of measuring stain of pipelines is set up. Stress and stain of pipelines and hangers during running first is measured. According to the measuring and calculating results, the reasons of serious displacement and overloading of hangers are analyzed synthetically. A scheme of reforming is put forward. The equipment of main steam pipelines runs well after being reformed.