• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2018, Vol. 54 ›› Issue (6): 182-190.doi: 10.3901/JME.2018.06.182

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Modeling of Tube Rupture Process of Boilers

LIU Fuguo, ZHOU Xingang, JIANG Bo   

  1. State Grid Shandong Electric Power Research Institute, Jinan 250002
  • Received:2016-10-12 Revised:2017-10-29 Online:2018-03-20 Published:2018-03-20

Abstract: Investigation in leakage process of internally pressurised pipe of boiler permits to derive lots of information about the precise conditions such as the location of the overheated section of the pipe, evaluation of the mental temperature and it's overheating time, which is essential to the pipe failure analysis and emergency maintenance. A mathematical model is established to predict the variations of steam mass flow rate and temperature in pipe when leakage increases from minimum to full flow, leakage growth is simulated with the operation parameters of ruptured tube in platen reheater of a 300 MW boiler, typical leakage developing process is presented, Theoretical results show that the pipe section downstream the broken area are overheated when the leakage develop at a certain stage, the location, extent and time of overheating section of the pipe are affected by leakage area and it's expansion process. Results predicted by the model of overheated and ruptured section are shown to be in good conformity with the findings in the fault diagnosis of boilers' heated pipe. The model is applied to help in tube rupture analysis, excessive mental temperature assessment and developing early leakage diagnosis methods which can reduce the blowing off adjacent tubes.

Key words: boiler, leakage, modeling, power plant, tube rupture

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