MFT

Remove boiler fuel system equipment automatically from service in the even of trouble. This reason is to protection for equipment for prevent further damage.
Master Fuel Trip (MFT) signals are coming from many ways.

1. MFT Push Button.
Example, when super-heater spray is stuck open and the temperature is rapid increase, operator should initiate MFT by push button to prevent boiler damage.

2. Fuel Input to Zero (Black Furnace).
Example, when all pulverizer trip. One pulverizer can be trip if mare than two coal pipe valve are shut, mill outlet temperature high and no flame detection. Signal flame can lost by flame dirty or scanner cooling air blower is getting interrupt.

3. By Pass System Failure (Lost of Flow Path).
Example, all electro-hydraulic control pump trip means turbine main steam stop and control valve, re-heater stop and control valve, HP and LP by-pass are getting lost of power. They will be directly shut and get signal turbine trip with boiler still high coal flow.


4. Drum Level High

5. Drum level Low.
Example, Drum level high or low frequently happen when even unit runback and Feed-water control valve conversion master control between single elements to three elements.

6. Furnace Pressure High.

7. Furnace Pressure Low.
Example, Furnace pressure high or low frequently happen when even unit runback

8. Secondary Air Duct Pressure High.

9. Total Air Flow Low.

10. All FD Fan trip.

11. All ID Fan trip.