1. When the auxillary power is off, the sealing fan shall be treated on condition that the auxiliary power is off.
2. When the sealing fan trips, the standby fan is not started in succession, if it has no obvious failure, it can be forced to start once, if it is still not started, the fan tripped may be started once.
3. After the sealing fan is fully stopped, it is urgently to make the oil gun operate and to stop the coal mill in order to reduce the load. If the coal mill is urgently stopped, the combustion deteriorates and fire is extinguished, measures shall be taken on condition that the fire is extinguished.