If the following situations occur, the combustion is deteriorated and the fire for boiler shall be extinguished:
The boiler drum water level cannot be maintained, the normal steam temperature and pressure cannot be maintained, thus directly threatening personal and equipment safety.
1. MFT for the boiler shall be manually operated to stop the boiler operation and complete shutdown of the operations.
2. After the shutdown, one induced draft fan is left to run, in order to eliminate flue gas and steam.
3. The highest visible water level of boiler drum shall be maintained to control the upper and lower temperature difference of boiler drum wall at the specified range.
4. The load of steam turbine shall be lowered quickly to accomplish the operations of shutdown after the fire for the boiler is extinguished.
5. During the whole operation, it is required to report the operation to the monitor on duty, to confirm the leak position, to inform the persons in charge of maintenance. During confirming  leak position, be more careful.