Phenomenon:
   --- Bed temperature indication is high or low.
   --- High bed temperature alarming.
   --- The load increases or decreases.
  Reasons:
   --- The feeding particle size is too large or too small.
   --- Measuring fault of bed temperature thermocouple.
   --- The feeder works abnormally.
   --- Ratio of the primary air and the secondary air is imbalance.
   --- Fault of slag-discharging system.
   --- The limestone system can not operate properly.
   Treatment:
   --- Check the bed temperature thermocouple.
   --- Check whether the operation and the controlling of the coal feeder are normal or not.
   --- Make the air distribution to be reasonable, and adjust the ratio between the primary air and the secondary air.
   --- If the combustion is not stabilized because of the low bed temperature, oil gun should be adopted as the combustion-supporting.