The briquetting plant can be operated in two ways. In the first case while pre processing the raw
material, the temperature of the feed material is not considered. In fact, the temperature is not at all critical for the production of briquettes. But if we take into consideration the power consumption, the wear behavior of the screw and the temperature of the die, then the temperature of the raw material at the time of feeding to the screw extruder plays a significant role.
The capacity of the feed preparation section of the plant must match with the briquetting capacity of the machine. In a commercial plant, the feeding of the raw material to the flash dryer is done through a screw conveyor. Components of a typical flash dryer are an air heater and a fan to produce a flow of heated air upwards through a long vertical drying duct.
The material to be dried is introduced into the airstream by the feeder, and the hot air conveys the particles through the duct in a concurrent flow. The dried material is then passed through a cyclone to separate particles from air and transported into the collecting hopper. The storage hopper should be given adequate attention regarding its capacity and to ease the flow of the material. Bridging in the hopper may cause fluctuations in operating conditions and may also lead to a production halt. The dry material is then fed to the screw extruder through a screw conveyor for its briquetting. In the case of briquetting with preheating of biomass, the material
is control fed to a preheater to heat it to a desired temperature.