such as lower temperature of main and reheat steam
unstable combustion
serious slagging and low ratio of putting automatic controls into operation
encountered on boiler No2 at Yunfu Power Plant
causes are found through analysis
and a scheme of improvement
including reasonable arrangement of Bailey wall
retrofit of burners and ignition oil-guns
speed regulation of pulverized-coal feeder by frequency-coverting technology etc. are put forward. After implementation of said scheme
indices of boiler No2 have reached or closed to the requirements of design
providing a practical example of successfully retrofitting the poor-grade stone-coal fired boilers to solve the commonly existing troublesome problems.