LPG SERIES CENTRIFUGAL SPRAY DRYER
PRINCIPLE OF WORKING
Air is turned into hot air through heater and enters into hot air distributor at the top of dry chamber and then enters into dry chamber and rotates in the state of helix. At the same time liquid of raw material is sent to centrifugal atomizer at the top of dry chamber through stepless variable screw pump. In which liquid of raw material atomizes small drops. Air and liquid of raw material flow and contact each other. The moisture vaporizes rapidly. Liquid of raw material is dried into finished product in a short time. The finished product is discharged through the bottom cyclone separator of drier and the wasted air is exhausted through fan.
FEATURES
The drying speed is very quick. When raw material is atomized, the surface area increases greatly. 65~98% of moisture can be vaporized in hot air stream momentary. The dry time to be used is only 5~15 seconds. Especially, it is suitable for drying thermal sensitive raw materials.
The size of finished product is uniform and the flow and solubility are good. The purity and quality of product are good too.
The operation is stable and simple. The regulation and control is very convenient. It is easy to realize automatic operation.
The operation process is simplified and the operation environment is superior and can avoid powder dust during the period of operation.
SCOPE OF APPLICATION
Chemical industry: sodium (potassium) fluoride, alkali dyestuff and pigment, dyestuff intermediate, compound fertilizer, catalyst, amino acid, white black and so on
plastic resin: ABS emulsion liquid, urea formaldehyde resin, phenol formaldehyde resin, formaldehyde resin, PE, PVC and so on
Foodstuff industry:
egg and milk products: rich lipoprotein powdered milk, cocoa powdered milk, baby meal, egg white, vitalize and so on, food and juice of plant, oat, chicken juice, coffee, crystalline tea, condiment and flavor, protein bean, earthnut protein, protein, hydrolysis and so on
sugar: maize paste, maize starch, glucose, pectin, maltose, potassium seriate and so on
Ceramic: aluminum oxide, ceramic tile material, magnesium oxide, pencil stone and so on
NOTICE IN ORDER
You need fully complete the following Requirements Sheet in order to design and manufacture a high quality dryer satisfying all your requirements. Please kindly advise us when make inquiry,
Material name
Shape
Density
Specific gravity
Viscosity
Safety to heat
(PH)Corrosiveness
Explosiveness
Toxicity
dried temperature
Moisture content
Average size of particles
Capacity
Actual operating time
Material of machine
Power (Steam pressure, Electric power)
| itemparameterspec | LPG | |||||
| 5 | 25 | 50 | 100 | 150 | 200-2000 | |
| inlet temperature °C | 140-350 automatically controlled | |||||
| outlet temerature °C | ~80-90 | |||||
| Max.water evaporation capacity | 5 | 25 | 50 | 100 | 150 | 200-2000 |
| centrifugal spraying nozzle transmission mode | compressed air transmission | Mechanical transmission | ||||
| Rotation speed rpm | 25000 | 18000 | 18000 | 18000 | 15000 | 8000-15000 |
| sprayingdesc diameter mm | 50 | 100 | 120 | 140 | 150 | 180-340 |
| Heat supply | Electricity | Electricity+steam | Electricity+steam,fuel oil and gas | Settled by users themselves | ||
| Max.Electric heating power kw | 9 | 36 | 63 | 81 | 99 | |
| overall dimensions m | 1.8×0.93 ×2.2 | 3×2.7 ×4.26 | 3.7×3.2 ×5.1 | 4.6×4.2 ×6 | 5.5×4.5 ×7 | Depends on the concrete conditions |
| Dried powder restoring tate % | ≥95 | ≥95 | ≥95 | ≥95 | ≥95 | ≥95 |
| Note:For the water evaporation capacity, material property,the inlet and outlet tempratures,please refer the following diagram for reference. |
2.The surface of the liquid drop is dried immediately to form a tough shell.
3.Further the liquid inside must escape by diffusing through the shell at a particular rate.
4.At the same time heat transfer from outside to inside takes place at a rate greater than liquid diffusion rate.
5.As a result heat inside mounts up which allows the liquid to evaporates at faster rate.
6.This tendency of a liquid leadsto rise in the internal pressure which causes the droplets to swell.
7.The shells thickness decreases where as permeability for vapour increases.
8.If the shell is neither elastic nor permeable it ruputur and the internal pressure escapes.
9.The temperature of the air is adjusted in such a way that the droplets should be compeletly dried before reaching the walls of the drying chamber.
10.The products should not be over heated at the same time.
Technical advantages of spray dryer :
1) Particle size control: The dry particle size can be easily controlled by atomization of the liquid feed and the design of the hot gas inlet. This spray dryer can typically produce between 30 to 500 micron average particle size, in a bell shaped distribution.
2) The evaporative cooling of product: The heat and mass transfer during drying occurs in the air and vapor films surrounding the droplet. This protective envelope of vapor keeps the particle at the saturation temperature. As long as the particle does not become "bone-dry", evaporation is still taking place and the temperature of the solids will not approach the dryer outlet temperature.
3) Short residence time: The surface area produced by atomization of the liquid feed enables a short gas residence time, ranging from 3-10 seconds depending upon the application, which permits spray drying without thermal degradation.
4) Flow properties of dry product: The shape of most spray dried particles is spherical, which provides for fluid-like flow properties. This makes many downstream operations, such as packaging, pressing, filtering, and handling easier and less costly.
5) Size design of drying chamber: The size of drying chamber is specially designed to prevent droplets sticking to the inner wall, dried powder accumulating on the cone part and guarantee enough residence time.
attention to order
Liquid name and propertysolid contents(or water contents),viscosity,surface tension and PH value.
Dry powder density residual water contents allowed,particle size,and maximum temperature allowed.
Output:shift time daily.
Energy that can be suppliedsteam pressure ,electricity properly,fuel of coal,oil and natural gas.
Control requirement:whether or not the inlet and outlet temperatures should be controlled. 
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China
