Techniques for low rank coal dewatering and drying

Introduce the techniques for low rank coal evaporation drying,such as rotary drying,fluid bed drying,entrained-flow drying.Meanwhile,study some non-evaporation dewatering technologies,including thermal dehydration,mechanical dewatering and UBC low rank coal upgrading technology.Emphasize the technological processes,technical features and status of these two kinds of dewatering technologies.Analyse the selection principle and basis for drying process,drying medium,factory location and energy consumption during the construction of low rank coal drying system.The results show that,the selection of drying system should consider the users requirement,the moisture of upgraded coal,security,energy consumption and the cost.The location of factory is crucial,the selection of drying medium should think ahead the cost and safety.The lower energy consumption guarantee the longer running of drying process and its economic benefits.