The high clean direct type coal hot air furnace developed by Meibao for the production of detergent powder was first applied for a national patent (ZL03 2 32246 1) in 2003. The high clean direct type biomass hot air furnace was first applied for a national patent (ZL2012 2 0711996.3) in 2012. So far, Meibao has applied for more than 30 national invention patents, utility model patents, copyrights, and other patents for the development of high clean direct type coal/biomass hot air furnaces for detergent powder production.

The biggest feature of this hot air furnace is that it can meet the whiteness requirements of detergent powder, and there are no visible black spots in the finished powder, which has no impact on the quality of detergent powder. Compared to oil and gas hot air furnaces, it saves fuel costs by about 2-5 times. The hot air furnace has been adopted by 180 detergent powder production enterprises, such as Unilever, P&G, Henkel, Nice, Liby, Lonkey, Nafine, Lipton Detergent Industrial, Topseller Chemical, Indonesia P.T Wings, India Shivani Detergents, Pakistan Ittahad Chemicals, Zambia Waterland Impex International Trading LLC, Angola M/S Agape General Trading Fze , Yemen Red sea Detergent Co., Ltd., Dominica MercaSID S.A., etc.