Chain Grate is the most widely used mechanized combustion equipment in industrial boilers, but it has a certain range of coal types. The combustion method of the chain grate is a moving fire bed combustion, and the fuel ignition condition is "limited ignition". The fuel enters the grate through the stoker. With the movement of the grate, the combustion process begins in the furnace, and the burnt slag is discharged to the slag well at the end of the grate with the movement of the grate. Therefore, compared with reciprocating furnace, vibrating furnace and boiling furnace, chain grate has higher requirements on coal grade. The mechanical coal throwing furnace is basically a layer-fired grate with infinite fire, and the adaptability to the coal quality is relatively wide.