A boiler moving grate chain is a type of mechanical stoker that is used to feed solid fuels into the furnace of a boiler. It is a continuous conveyor system that consists of a series of interlocking links that are driven by a chain drive. The links are typically made of cast iron or steel and are designed to withstand the high temperatures and corrosive environment of a boiler furnace.

The boiler moving grate chain is installed at the bottom of the boiler furnace and is inclined at a slight angle. The fuel is fed onto the chain at the front of the furnace and is then carried through the furnace as the chain moves. The fuel is ignited by the heat from the furnace and burns as it moves through the furnace. The ash from the fuel is discharged from the chain at the rear of the furnace.

Boiler moving grate chains are typically used in boilers that burn coal, biomass, or other solid fuels. They are a versatile and reliable type of stoker that can be used to burn a wide range of fuels.