Stress On-line Detection Device Of Ultra-supercritical Unit Main Steam Line

The operational reliability of ultra-supercritical unit main steam line plays animportant role in the whole safe operation of the power plant. The support andhangers is the key part in balancing stress of the main steam line. However, theworking condition sometimes will change because of the vibration and impact. It willresult in non-uniform stress and damage in the weak part of the piping line. Therefore,how to accurately evaluate the condition of the hangers and analyze the force situationcan affect the long-term performance of high temperature main steam line.This study designed a stress real-time detection system based on FBG sensor.This system includes an upper PC and embedded system lower computer. The systemhad a monitoring in the stress of the support and hangers. The detection system has agood stability, speed and precision during the monitoring period. The results arewithin the setting value. Hence, the support and hangers are in the ideal state ofservice. At last, we use CAESAR II, the professional pipe stress analysis software, tocheck the stress of the main steam line and finally get the situation of the operationwith the data obtained from the ysytem.It is meaningful to monitor the force situation of the support and hangers in realand long time. This detection system can provide the monitoring data to help the mainsteam pipe line with safe and reliable operation and improve the force of pipe. At last,our purpose is to avoid the accident and prolong the pipe operation time.