Abstract: The problems of furnace coking and coke falling are serious in the“W”-flame boilers of the six 350-MW units of Yangcheng Power Plant due to the coal quality and have caused the tripping of main fuel by furnace pressure protection repeatedly, which seriously affects the safe and stable operation of the units. The analysis on the operation curves of the furnace pressure protection and the problems in the furnace pressure sampling system, protection system and control system is conducted and solutions are proposed based on the actual field conditions. The effectiveness of the solutions is proven and can be used as the reference to similar problems.

Key words: “W”-flame boiler, coking, furnace pressure protection, optimization strategy