1. The interlocking in sequences for the induced draft fan of boiler, the rotary air preheater and the forced draft blower in starting/stopping and emergency tripping. 

2. The tripping sequences among the induced draft fan of boiler, the rotary air preheater and the forced draft blower and the starting/stopping interlocking of the three with the related baffles in the gas and air duct. 

3.The interlocking of combustion system and pulverizing system when the forced draft blowers are shut down completely. 

4. The starting/stopping and interlocking in sequences during emergency tripping of the coal feeder and coal mill in the pulverizing system. 

5. The interlocking of pulverized coal exhauster and pulverized coal feeder in the pulverized coal feeding system of pulverized coal exhauster. 

6. Starting/stopping of flue gas recirculation fans and interlocking of damper and cold air valve at the outlet. 

7. Interlocking of large auxiliaries with their lubricating oil system, cooling and sealing system and the interlocking of self-starting of standby pump when the operating pumps in this system are tripping in emergency.