Failure Characteristics Analysis of S30432 Platen Superheater Tube Caused by Steel Ball Blocking
Taking the platen superheater tube burst of a 600 MW ultra supercritical boiler caused by overheating creep due to steel ball blockage in the trial operation stage as an example,through macroscopic inspection,size measurement,chemical composition analysis,mechanical property analysis,metallographic analysis,Vickers hardness test and scanning electron microscope observation,and comparison with adjacent tubes,the characteristics of S30432 tube burst failure caused by steel ball blockage are obtained.The results show that the S30432 platen superheater tube plugged with steel ball in the ball passing test has obvious characteristics in the aspects of pipe diameter,wall thickness,creep holes,creep cracks and aging degree;All the test results of the leaking tube except the bursting port meet the requirements of the standard for new tubes,but its material state is obviously worse than that of adjacent tubes.
国家科技期刊平台
NSTL
万方数据
