Modern designs are examined, and technical data presented for vibratory electric and convection driers, driers with infra-red sources, and steam driers.Drying is one of the most important production processes in the chemical industry. Various requirements with respect to output, temperature, drying time, the ecological safety of the equipment, etc., are established for driers, depending on the characteristics of the production process and the properties of the material being treated.Konsit-A OOO has developed, and is producing a broad gamut of designs for vibratory driers. Use of vibration ensures high efficiency of these units:• the rate of heat and mass exchange in the materials is increased under the vibratory effect, as a result of which productivity is raised and unit power consumption reduced;• a combination of production and transporting operations is possible in the vibratory units; and • the possibility of complex automation of heat-treatment processes, and the required quality of the finished product is ensured.Konsit-A OOO manufactures the following types of vibratory driers: electric, convection (hot-air drier), infra-red, and steam.Vibratory electric driers are units in which the material is heated by tubular electric heaters (TEH). The SVT-0.5 driers and the PÉV-270 furnace fall within this class of driers.The SVT-0.5 drier (Fig. 1) is a vertical vibratory conveyer with external grooved turns, which is placed in a stationary thermally insulated four-door enclosure.Forty-eight TEHs each with an output of 2.5 kW are positioned on the inside of the doors. The drier is equipped with branch pipes for the charging and off-loading of material, and also a branch pipe for tapping of the steam-air mixture.Thermocouples are used to control the temperature in the drying zone, in the off-loaded material, and the steam-air mixture. The drier is furnished with a control desk from which the temperature required in the drying volume is assigned and maintained. The material entering the drier is continuously displaced from a lower to upper turn, which is coupled to the off-loading branch pipe, where it is subjected to the thermal influence of TEH for 6-8 min. This time is sufficient for removal of up to 80 kg of moisture per hour from the material being dried. The steam-air mixture formed is vented through a branch pipe connected to a ventilation system.These driers are used in very different branches of industry. At the Orel Mining and Concentration Combine, for example, nine SVT-0.5 driers are used to dry tungsten concentrate. In one of the mills at the Chepetsk Chemical Plant, six of these units have successfully replaced the furnaces that had been previously used, reducing by several times the production area required for this procedure.
