Abstract: The coordination of supercritical boiler operation is coordination of air flow, water flow and coal mainly, the controlling indications are coal-air ratio and coal-water ratio. The principle of the control modules which includes mill rotating speed control, primary air control, secondary air control, overfire air control, oxygen content correction control, fuel oil pressure control, furnace pressure control etc. was produced in detail. The control tactics to ensure boiler stable combustion were put forward which demands that in the system design the dynamic cross interlocking of coal and air flow must be considered on the precondition of static balance for the coal-air ratio control, and the air flow must be greater than coal at the dynamic process.

Key words: supercritical boiler, coal - air ratio, cross-limitation overmeasure, air flow, overfire air, fuel oil, furnace