Technological operations of drying and grinding are related to each other, but the majority of technologies use separate equipment for their solutions. Aerodynamic dispergator allows to solve effective the problems with technological operations of drying, grinding and separation in a equipment unit.
Problem: It’s necessary to efficiently grind material in order to increase material particles specific surface, smooth breakup and to decrease energy consumption for material drying.
Solution: in working area of aerodynamic dispergator simultaneous processes of material drying and grinding execute, that leads to decreasing of drying time and energy consumption.
Problem: It’s necessary to make close to “ideal drying” conditions, when constant contact of material with desiccant agent would be assured for as much as possible effective using of desiccant agent heat energy. Desiccant agent will join drying area at a speed more than 10 metres/second relative to material particles, that won’t allow it to mix with evaporable moisture.
Solution: material drying in aerodynamic dispergator is assured by intensive air-mass exchange, which is the result of technical solution of this equipment. Material particles are held in drying-grinding zone by inertial forces. Material particles form fluidizated bed at the outer radius of horn rotation, through it desiccant agent is blown – air. Airflow, which assures material drying, is 30.000 cubic meter/hour, flow rate is 25-26 metres/second relative to material particles, which are in fluidizated bed.
Problem: It’s necessary to assure timely material selection from a dryer, excluding its overheating for limiting the possibility of material destruction.
Solution: the principle of inertial separation is used in aerodynamic dispergator. Inertial separation is a selection of material particles, which have necessary characteristics, it executes from drying-grinding area. As a result of inertial separation material particles are passed away only with necessary humidity.
Drying process in aerodynamic dispergator also increases owing to intensive friction and collision of particles with each other in dense velocity (fluidizated) layer by motion with high circumferential velocity in aerodynamic dispergator. It’s acceptable to use heat carrier with temperature range to 250 C.
Problem: grinding apparatus should allow to process non-rejected and wet material.
Solution: The combination of drying and grinding with inertial separation allows to grind materials with initial humidity to 60% by weight. Impingement attack of rotor blades to material and multiple material particles collisions in dense velocity layer allow to grind coarse material particles efficiently. Rotor rotational velocity, depending on its model, is 2000 turns per minute. During grinding process simultaneous drying is executed, it doesn’t allow material to stick to operating apparatus surface.
Problem: It’s necessary to perform separation from grinding area for effective grinding.
Solution: applied inertial separation principle allows to take out particles of necessary size from grinding area under air flow.
Problem: Associated equipment specifications aren’t obligatory
Solution: material feed may be executed by different ways: by jet transport, by auger conveyer, by belt transporter. Material selection from air flow is executed with the help of specially developed whirler by SIOT, material is precipitated to bunker.
Problem: Selection of material particles of necessary size and humidity from drying and grinding zones
Solution: Inertial separation is an ejection of ready grinded and dryable material, which is executed from apparatus centre under forces, made by intensive air flow, coarse particles as a result of inertial forces dominance rest in grinding area and fine and dry particles are taken away. Radial separation is more delicate, it allows to separate ( take away from grinding and drying area) especially fine particles of uniform granulometric structure.
Problem: Separation is a division of mixed particles of different materials
Solution: Inertial separation. Forces, which effect inertial separation, are regulated delicately with the help of changing of rotor rotational speed and volume of processing air. You can adjust the equipment to take away particles of necessary characteristic of one material tangentially from grinding zone to bin, which is situated at the bottom of equipment; and to select particles of other material of other characteristic radially.