This series double-drum biomass boiler is horizontal moving chain grate steam boiler. The boiler has two drums and convection bank inside. Water wall tubes are placed in the burner at left and right side. There is a steam-water separator and surface blow down device fixed in the upper drum, and a periodic blow down device fixed in another drum which is at the bottom. The tail decorates economizer. Moving chain grate makes it convenient to feed coal, Induced draft fan and forced draft fan make good ventilation. Fuel from coal scuttle fall on grate stoker, enters the furnace was burned, the flame through the combustion chamber ,the economizer and was drew forth by induced draft fan and into the atmosphere.
