The high-clean direct biomass fired hot air furnace developed by Meibao has been successfully applied to the redispersible emulsion powder production line recently, replacing the original indirect gas fired hot air furnace, greatly reducing the fuel cost and achieving good economic and environmental benefits. The high-clean direct biomass fired hot air furnace is a patented product of Meibao, which has been successfully applied to the production line of washing powder, feed, water purifier and other products with high cleanliness requirements, and achieved good energy-saving and consumption-reducing effects for customers.