The sawdust dryer is mainly composed by air heater, feeder, airflow dryer pipe, cyclone separator, fan, etc. The drying process continuously feeds sawdust into drying tube by screw conveyor to evaporate moisture in wet material in the transportation and dispersion of the high-speed hot air stream, so as to get the dried product of the powdery or granular. Sawdust dryer is widely used in wood pellet fuel, sawdust briquettes, agricultural engineering, straw briquette fuel, charcoal machinery and other industries, such as sawdust, wood shavings, sawdust, ginkgo leaves, mulberry leaves, corn stalks, soybean straw, cotton stalks, wheat straw, sorghum stalks and other agricultural cellulose-based material.
The sawdust itself has characteristics of high humidity and high adhesion, so, during the drying process, the wet sawdust should be fed into the sawdust scattered equipment via the belt conveyor, the block wet sawdust after quickly thrashing will experience four working areas after entering the negative pressure dryer. Feeder guiding area, wet sawdust will rapidly evaporate large amounts of water after entering into this area and contacting with high temperature negative pressure hot air, so wet sawdust will be imported to next work area without forming a bond.
Clean-up area, wet sawdust material is in curtain state in this area, so materials are easily to be bonded with drum wall when they fall down, the cleaning device in this area will quickly clean out the sawdust bonded cylinder wall and break block sawdust, at the same time to increase the heat exchange area and improve the drying rate. Inclined lifting plate area, this area is a low-temperature drying area, in which area the sawdust is in a loose state with low moisture to avoid bonded phenomenon, the finished product will enter into the final discharging area after heat exchange. Discharging area, the finished materials scroll to the discharging port and complete the entire drying process in this area.
