The causes leading to desuperheater fracture of boiler's superheater for 600 MW unit of one power plant have been analysed

it is believed that the main causes are as follows: large temperature difference between wall temperature of leading-in pipe and that of atomizing tube for the desuperheating water

welding defects of the inlet tube socket with the inlet tube of desuperheater

as well as malpractice existing in weldjoint of different steels for the atomizing tube and the inlet tube etc..For these

measures such as changing the quality of materials

decreasing the thickness of tube-wall

improving the welding technology and the detecting method etc.have been put forward.After implementation

vibration and other abnormalities of the desuperheating water pipeline have never occurred again

equipements are in stable operation.