Biomass steam boiler has two types, horizontal biomass steam boiler, vertical biomass steam boiler. SZL biomass fired steam boiler series double drums boiler is horizontal type water tube boiler with high steam quality. The boiler adopts membrane water wall, low thermal inertia design, and water cooling combustion chamber. LSH series coal or biomass steam boiler is vertical type structure with small steam capacity. The combustion equipment is moving grate. The boiler uses the general combustion technique.