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Centrifugal Spray Dryer

The centrifugal spray dryer is widely used in liquid technology shaping applications and other industrial drying applications. The drying equipment is most suitable for producing powdered or granular solid products from liquid state materials, such as solutions, emulsions, suspensions and pastes. When size distribution, residual water content, stacking density and shape of the final product have certain standards, spray drying is the desired drying method.

Principle of work
The centrifugal spray dryer heats filtered air that is then pumped into the hot air distributor on the top of the dryer. The air then enters the drying room evenly as liquid materials are sent through the centrifugal atomizer on the top of the machine and are atomized into tiny droplets which are quickly heated and dried. The finished products are discharged from the bottom of the drying tower and from the cyclone separator. Waste air is exhausted by a suction fan.

1. Air filter
2. Blower
3. Air heater
4.Feed bin
5.Feed pump
7.Drying chamber
8.First powder catcher (cyclone)
9.Second powder catcher (cyclone or bag filter)
10.Suction fan
11.Exhaust air filter (water film scrubber)

Compelete flow for reference

1. Fast drying speed. Liquid material after atomization will increase its surface area largely and can evaporated its moisture 95%~98% instantly. Drying time is usually 5 to 15 seconds. It is especially suitable for the drying of heat sensitive raw materials.
2. Dried products have even granules, good flow ability and solubility.
3. Suitable and stable operation, easy adjustment and control as well as automation.
4. Simplifies the production process with its superior and sanitary operation environment. Also, flying dust can be avoided during the drying process.

Evaporation curve

Technical Parameters

Specification LPG5 LPG25 LPG50 LPG100 LPG150 LPG200-3000
Inlet temperature ≤ 350°C
Outlet temperature 80-90°C
Evaporating rate (kg/h) 5 25 50 100 150 200-3000
Rotating speed(rpm) 25000 22000 21500 18000 18000 15000
Dia. of atomizing tray(mm) 50 120 120 120 150 180-340
Heat source Electricity Electricity Electricity+ steam, oil fuel, gas, or coal
Electrical-heating power 9 45 60 81 99 -------------
Dry powder Yield ≥ 95
Installation Size For reference A(mm) 1000 1290 1730 2500 2800 Decided according to actual condition
B(mm) 2100 3410 4245 5300 6000
C(mm) 2300 4260 4645 6000 6700
φ D(mm) 1060 1800 2133 2560 2860
E1(mm) 1050 1200 1640 2100 2180
E2(mm) 1050 1200 1640 2100 2180
F(mm) 750 1000 1250 1750 1970
G(mm) 530 1700 1750 1930 2080

Spray Drying Stages
1. Atomizing: feed liquid is dispersed into even fog droplets.
2. Droplets contact the hot air: hot air enters into the drying chamber, fully mixing with the droplets
3. Drying process: the increased surface area of the droplets allows for a quick absorption of the hot air and causes nearly instant evaporation of moisture, leaving only solid particles.

Dried Samples
Foodstuffs: amino acid, vitamin, flavoring, protein, dried milk, soy powder, coffee, tea powder, glucose, potassium sorbate, pectin, vegetable juice, yeast, starch etc.
Ceramics: alumina, zirconia, magnesium oxide, titanium oxide, magnesium titanate, pottery clay, china clay, all kinds of magnetic porcelain and metal-oxides etc.
Chemical products: dispersed dyestuff, active dyestuff, organic catalyst, white carbon black, detergent powder, zinc sulfate, sodium metasillicate, potassium fluoride, calcium carbonate, tribasic potassium phosphate, inorganic catalyst and all kinds of waste liquid etc.

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