ZOZEN SZL series double-drum longitudinal biomass boiler is a common type, with a capacity of 4-35 tons. More than 6 tons can be divided into two components: combustion chamber and grate base. The gallery is a combustion chamber, with water-cooled walls arranged around the front end, the upper part connected with the drum, and the lower part connected with the header to form a combustion chamber to absorb the radiant heat of the furnace.