Spray drying is the most widely used technology in liquid forming and drying industry. It is most suitable for producing powdery and granular solid products from solution, emulsion, suspension and paste liquid raw materials. Therefore, when the particle size distribution, residual water content, bulk density and particle shape of finished products must conform to the exact standard, spray drying is a very ideal process.
The air is filtered and heated, and enters the air distributor at the top of the dryer. The hot air spirals evenly into the drying chamber. The high speed centrifugal atomizer at the top of the tower (swivel) is atomized into tiny droplets of mist, contacting with the hot air and flowing into the finished product in a very short time. The finished product is continuously discharged from the bottom of the drying tower and the cyclone separator, and the exhaust gas is drained away by the fan.
The drying speed is fast, and the surface area of the slurry is greatly increased after atomization. In the hot air flow, the water content of 95%-98% can be evaporated instantaneously. The drying time is only a few seconds, especially for the drying of heat sensitive materials.
The product has good uniformity, fluidity and solubility. The product has high purity and good quality.
The production process is simplified and the operation control is convenient. For liquid containing 40-60% (90% of special materials), the liquid can be dried into powder at a time. After drying, it does not need to be crushed and screened, so as to reduce production process and improve product purity. The size, density and moisture of the product can be adjusted within a certain range by changing the operating conditions. The control and management are very convenient.
Chemical industry: sodium fluoride (potassium), basic dyes and pigments, dyestuff intermediates, compound fertilizers, formaldehyde, silicic acid, catalyst, sulphuric acid, amino acids, silica and so on.
Plastic resin: AB, ABS emulsion, urea formaldehyde resin, phenolic resin, rubber (urea) formaldehyde resin, polyethylene, polyvinyl chloride and so on.
Food industry: fat rich milk powder, collagen, cocoa milk powder, milk powder, hunting blood powder, egg white (yellow) and so on.
Food and plants: oats, chicken juice, coffee, instant tea, flavoring spices, protein, soy, peanut protein, hydrolysate, etc.
Carbohydrates: corn steep liquor, corn starch, glucose, pectin, maltose, potassium sorbate, etc.
Ceramics: alumina, ceramic tile, Magnesium Oxide, talc and so on.
Project / parameters
|Inlet temperature||140-350 Automation|
|Maximum evaporation of water（kg/h）||5||25||50||150||200-2000|
|Drive form of centrifugal spray head||Compressed air transmission||Mechanical transmission|
|Diameter of spray tray（mm）||50||120||120||150||180-240|
|Heat source||electricity||Steam + electricity||Steam + electricity, fuel, gas, hot stove|
|Maximum power of electric heating（kw）||9||36||72||99|
|Dimensions (length × width × height) (m)||1.8×0.93×2.2||3×2.7×4.26||3.5×3.5×4.8||5.5×4×7||Determined according to the actual situation|
Note: water evaporation is related to the characteristics of materials and the temperature of hot air inlet and outlet. When the outlet temperature is 90oC, the evaporation curve is shown above (for reference). With the continuous updating of the product, the relevant parameters will be changed without prior notice.
Instructions for ordering
Material name and physical properties: solid content (or water content), viscosity, surface tension, pH value.
Dry powder capacity, permissible residual water content, granularity and allowable maximum temperature.
Production and daily working hours.
Available energy: steam pressure available, capacitance, available for coal, oil and gas.
Control requirements: whether the inlet and outlet temperatures need automatic control.
Requirements for powder collection: do we need to install a bag trap and exhaust emissions from the environment?
Other special requirements.