... husk, etc The series is double drum longitudinal boiler, chain grate as burning equipment. Wood pellet dropping on grate from wood ... from Chimney; The last product is quickly package water tube boiler. Ontology is single Drum longitudinal A type. High temperature ... large, (adapt all kinds of Bituminous, anthracite, lignite and lean coal) 2. High thermal efficiency, low noise, small volume, less ...