Boiler Tube Leakage Early Detection System


The QN/XL Automatic Boiler tube leakage detection system is taylor made for power station boiler application, and gives an early warning of the leakage of boiler water wall tube, superheated tube, reheat tube and economizer tube. It can detect small leaks less thank 1mm.  


Using the principle of acoustic monitoring, various acoustic signals are collected from the furnace and converted into current signals. The detection and alarm system analyzes the spectrum of the acoustic signal by fast Fourier transform technology and displays it in the form of a bar graph. The analysis of noise intensity, spectral characteristics and duration determines whether the furnace tube leaks.



  • Alarm leakage ahead of time 
  • Real-time display of leakage position
  • Showing the leakage frequency spectrum
  • following the leakage growing trend
  • Real-time monitoring noice in the boiler 
  • Long time recording historical trend of leakage 
  • Watching operation condition of ash blowers
  • Self diagnostic of the field device
  • Determine the ash-blocked condition of the conductive tubes
  • Equip with manual and automatic ash blowing in the conductive tubes.



Proven Solutions

It has been installed more than 200 units from 20MW captive power plant to 1,000MW large utility power station. 


Safety Benefits

  1. Prevent unplanned outage of the unit, which is conducive to grid load dispatching.
  2. Prevent or mitigate damage caused by secondary leakage.
  3. Avoid the phenomenon of mis-detection and nuisance alarm caused by traditional leak detection methods.
  4. Avoid accidents caused by on-site inspections by operating personnel.
  5. Prevent the soot blower from damaging the heated surface pipe.


Economic Benefits

  1. Shorten the repair period of furnace tube leakage and reduce labor intensity.
  2. Reduce equipment losses caused by secondary leakage.
  3. Improve the availability of the unit.
  4. Monitor the operating conditions of the soot blower, which is beneficial to improve boiler efficiency.
  5. Conducive to preventive maintenance of boilers.