The common models include DHL10-1.25-T, DHL35-2.5-T.DHL biomass fired boiler is one large volume, layer combustion, energy saving chain grate boiler, independent innovated and designed by ZG Boiler, on the basis of importing new technology through GEF project and domestic and foreign technology research of corner tube boiler, according to the technical development characteristics of domestic coal fired chain grate and market demand, which is reliable in the water cycle, high efficiency of combustion, and low pollution emission.