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Spray Dryer drying method? Material changes and choices
Spray Dryer for a continuous atmospheric dryer. Special equipment to feed liquid spray into a mist so that it touched the hot air drying. For some dry heat-sensitive liquids, suspensions and viscous liquids such as milk, eggs, tannins and drugs. Also used to dry fuel, intermediates, soap powder, and inorganic salts.
  Spray drying is one of the most advanced equipment in the drying equipment. There are three kinds of conventional atomization methods: rotary atomization, pressure atomization and gas atomization.
  The rotary atomizer spray drying is characterized by stand-alone production capacity (spray volume of up to 200t / h), the feed rate is easy to control, operating flexibility, used widely.
  Pressure atomizer spray drying is characterized by the manufacture of coarse particles, and easy maintenance. The nozzle hole is very small, easy to plug, so the feed solution must be strictly filtered. Nozzle hole easy to wear, shall use in the manufacture of wear-resistant materials. Pressure nozzle, there is a new structure, called the pressure - flow nozzle. It is characterized as the center is a pressure nozzle gap of the surrounding environment for the air-nozzle. Atomization in two stages: pressure nozzles formed first film, this liquid film airflow second atomization and finer droplets.
  The advantages of this type of nozzle:
  (1) adjust the pressure of compressed air, can adjust the droplet diameter, easy to operate;
  (2) production, the material liquid of high viscosity, can also be atomized fine droplets; 3 If you disable the compressed air pressure nozzle can also be used.
  Gas atomization is mainly used for laboratory and pilot plant, its power consumption. The first two atomizer atomized liquid, air-blast atomizer may be atomized. The high viscosity paste, cream and cake material, three-fluid nozzle can be used to atomization.
  Air dryer air drying technology is mature, if operational data can be directly designed. Currently, there are a lot of drying equipment manufacturer able to provide this type of equipment.
  Fluidized bed dryer fluidized bed dryer is second only to the spray dryer. Divided into the fluidized bed dryer of the feeding site set blender and heat transfer within a fluidized bed dryer. Easy-to-unity or agglomeration of the powder material with fluidized bed drying, relatively large water feed zone fluidized difficult phenomenon, this time set the stirrer in the feed zone, eliminating the problem of knot groups, can achieve normal flow of. The latter is the heat conduction and convection heat transfer combination, when used for the normal flow of the state the amount of hot air is far from satisfying the heat needed to dry, set up within the heat exchanger, supply part or most of the heat, which The operating modes can be significant energy savings. The within the heat exchanger there are a variety of forms. The fluidized bed is also often used for the combination of dry second and third stages of the drying machine.
  Imposed in the ordinary fluidized bed vibration, said vibration fluidized bed. Vibration fluidized generate local oscillator can be divided into two categories: one for the vibration motor drive; and the other for normal motor excitation box spring vibration. Vibration fluidized bed size is large, the latter is better.
  The process of fluidized bed spray granulation dryer fluidization technology, organic combination of the atomization and drying technology. It is the atomization of solid to liquid spray to the seed of the fluidized bed, so that the seed has grown up and dry, to be grown up to the required size when discharged. The device's small footprint, large capacity, can produce large particles. The equipment for industrial applications has been increasing.
  To adapt materials
  Chemical: catalyst, resin, synthetic detergent, oil, ammonium sulfate, dyes, dye intermediates, white carbon black, graphite, ammonium phosphate, etc..
  Food: amino acids and analogues, seasonings, protein, starch, dairy products, coffee extracts, fish meal, meat and other fine.
  Pharmaceutical: proprietary Chinese medicines, pesticides, antibiotics, pharmaceutical granules. Ceramics: magnesia, clay, metal oxide, dolomite, and so on.
  Spray granulation: a variety of body fat, alumina, ceramic powder, pharmaceuticals, heavy metals and super-hard steel, fertilizer, granular detergent, proprietary Chinese medicines.
  Spray cooling granulation: amino fatty acids, paraffin, glycerol acid, fat, tallow, etc.. Crystallization of spray, spray concentrate, spray reactions are frequently used.
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