Air Distribution Methods for Chain Grates

Air distribution on a chain grate follows the principle of less air at the front and rear sections and more air in the middle. This matches how combustion is zoned along the grate length.

Zoned combustion and air split

Fuel burns in zones along the chain grate; the middle is the most intense combustion zone and needs more air for the reaction, while the front and rear sections hold fuel in preheating and burnout stages and need less.

Purpose of the air distribution design

Staged air distribution matches air volume to oxygen demand in each zone, avoiding oxygen shortage in the middle and excess air at the ends, and cutting unburned loss and flue gas heat loss.

Air supply in special arrangements

If the boiler uses a D-type layout or a double grate with the left and right sides separated, the grate may only support air entry from one side, and the air distribution design must be adjusted to single-side supply.