Abstract: Plugging-up of the buffer feeder and sticking of material inside rotary drum dryer are the problems confronted by the coal slurry drying system of Shuiquan Coal Preparation Plant.To tackle these problems,and in the light of the plant’s existing operating conditions,work is made on the technical reform of the front baffle of the buffer feeder,the discharging hopper and motor of scraper conveyor,and drum dryer’s tail-end material lifting plate.Since the technical transformation of the equipment and parts as listed above,there has been seen an elimination of blocking of feeder,reduced frequency of occurrence of material sticking up inside dryer,a reduction of moisture of dried product from 19.60% to 14.80% and a rise of calorific value of dried product from 17.60 MJ/kg to 19.20 MJ/kg.The dried product is well up to the quality standard set by the plant.Moreover,the gas emission of the drying system can meet the environmental protection requirement.The stable operation of the drying system not only provides a technical guarantee for the treatment of the slime in step with the operation of the coal cleaning process,but also brings forth favorable economic,social and environmental benefits.