Waste heat boiler drum water level control method and system based on FCB process

The invention discloses a waste heat boiler drum water level control method and system based on an FCB process, and relates to the technical field of thermal power generating unit automatic control. A control request is responded, a to-be-controlled waste heat boiler corresponding to the control request is determined, and a corresponding real-time action signal and a real-time drum water level measurement value are obtained in real time; determining a corresponding regulating valve opening instruction by adopting the real-time action signal and the real-time steam drum water level measurement value, and performing opening control on a water level regulating valve of the waste heat boiler to be controlled by adopting the regulating valve opening instruction; the problems that an existing water level control method is complex in structure and large in system configuration and debugging difficulty are solved, and the technical problem that the existing water level control method is only suitable for water supply