The high clean biomass hot air furnace used in the 20000TPA detergent powder production line has recently passed the acceptance inspection and been put into production operation. This hot air furnace uses biomass fuel and is equipped with a 10 ton waste heat boiler. While meeting the hot air requirements for detergent powder drying, it can generate 10 tons of steam per hour. The tail gas from the waste heat boiler is recovered and utilized for detergent powder drying production, greatly reducing production costs. This technology has been applied to many famous detergent powder production enterprises such as Unilever, P&G, Nice and Liby.