Superheated steam drying sludge
     The superheated steam in a fluidized bed, stirring dryers and flash dryer can be dried sludge, Hirose and Hazama for steam drying sludge showed a water content of 400% (db) of the first with mechanical dewatering of sludge and dehydration was evaporated down to 75% moisture, and finally to stay for another 5% of the heat value of the sludge up 8.4-19MJ/kg. Drier evaporated steam can be used as heat source for the evaporator.
Japan has successfully developed a multi-stage mixing sludge dryer superheated steam, productivity reached daily 15t, 360 ℃ superheated steam to 3600kg / h flow rate into the dryer, exhaust temperature of 150 ℃, volumetric heat transfer coefficient 377kJ / (mmmh. ℃). In order to avoid undesirable leakage of odors, a dryer maintained at atmospheric pressure over 10-100mm water (1mm water = 9.80 665Pa) conditions. Beginning first with hot air circulation, and water to the hot air. Until the entire system is full steam. Should be noted that, since the sludge contains a variety of chemical or biochemical composition, therefore, before entering the dryer should be possible to remove the sludge in the water. In addition, it was reported in Russia has successfully steam impingement flow drying technology for drying sewage sludge.

 

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