Fumace Safeguard Supervisory System (FSSS) is an important system to ensure the safe operation of boilers. It continuously monitors the relevant operating parameters of the boiler at various stages of boiler start-up, operation and stop. According to the safety conditions specified in the explosion-proof regulations, it continuously makes logical judgments and calculations. It uses the corresponding interlocking device to make the combustion equipment complete the necessary operations according to the established procedures, to avoid the accumulation of explosive air-fuel mixtures in the furnace and flue, and to quickly cut off all fuel entering the furnace when working conditions that endanger the safety of the boiler, Prevent furnace explosion accidents.