Combustion control system for heating furnace

The utility model discloses a combustion control system for a heating furnace, and relates to the technical field of metallurgical machinery. The combustion control system comprises a burner, an air pipeline, a fuel gas pipeline, a pressure regulating pipeline, a PLC (programmable logic controller) and an ignition controller, one end of the air pipeline and one end of the fuel gas pipeline are respectively communicated with a combustion-supporting end and a fuel gas end of the burner, and an SAM (secure access module) electric control valve and a first hand valve are sequentially arranged on the air pipeline. And a second hand valve, an electromagnetic valve and a manual linear valve are sequentially arranged on the gas pipeline. The opening degree of the first proportional valve can be adjusted through the first connecting pipe, meanwhile, the SAM electric control valve is arranged on a combustion-supporting air pipeline, the SAM electric control valve has the three-position control function of a closed posi