Due to the frequent start-stop,deep load changing,and long-term low-load operation of coal-fired power-generating units,the number of tension fracture accidents of water wall has gradually increased,which seriously threatens the safe and stable operation of power-generating units.This paper develops a water wall expansion state online monitoring system to address this problem.The laser ranging and 4G wireless transmission technologies are applied to measure expansion displacements at different positions of the water wall.The expansion displacement data are then statistically analyzed to assess the expansion state and damage degree of the water wall.The test results in a 1000 MW thermal power-generating unit indicate that the monitoring system can effectively monitor the expansion state of the water wall,with the advantages of good real-time performance,high sensitivity and high accuracy.This system provides an effective method to solve the problem of expansion fracture of water wall,which is of great significance to improve the safety and stability of power plant boilers.
Power plant boilerWater wallThermal expansionOnline monitoring
NETL
NSTL
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