Products Description
The milk spray dryer operates on the principle of flash evaporation coupled with centrifugal or pressure-assisted atomization. The process begins as pretreated liquid milk is delivered into the feed system. Within the drying chamber, the liquid is dispersed by a precision atomizer-typically a high-speed centrifugal wheel or a pressure nozzle-generating a uniform mist of micron-scale droplets.
This fine atomization, producing droplets typically ranging from 10 to 150 microns, creates a vast surface area for heat and mass transfer. Simultaneously, heated air (or inert gas) is introduced into the chamber in a controlled, co-current or counter-current flow pattern. Upon contact with the hot air, the surface moisture of each droplet evaporates almost instantaneously.
Due to the high surface-to-volume ratio, internal moisture migrates rapidly to the droplet surface, sustaining a constant drying rate. As evaporation proceeds, the solids within each droplet concentrate and solidify, forming discrete, free-flowing powder particles. The entire process-from liquid to powder-takes place within seconds, preserving heat-sensitive components through rapid moisture removal
Products details
working principle
The milk spray dryer working principle are follows：
- Feed System: Introduces liquid milk into the spray dryer. The milk is often pre-concentrated to reduce the water content before drying.
- Atomizer: Converts the liquid milk into fine droplets. Common types of atomizers include rotary atomizers (spinning disk) and nozzle atomizers (pressure nozzle or two-fluid nozzle).
- Drying Chamber: A large, insulated chamber where the fine droplets of milk are exposed to hot air. The hot air evaporates the moisture from the milk droplets, transforming them into fine particles of powder.
- Heat Source: Provides the hot air necessary for drying. This can be achieved through various heating methods, such as gas burners, electric heaters, or steam heaters.
- Air Flow System: Controls the flow and temperature of the hot air in the drying chamber. Ensures even drying and efficient moisture removal.
- Cyclone Separator: Separates the dried milk powder from the air. The powder is collected for further processing, while the air is filtered and released.
- Powder Collection System: Collects the dried milk powder, which is then packaged and stored. This system can include hoppers, conveyors, and packaging equipment.
- Control System: Monitors and adjusts various parameters such as temperature, air flow, and feed rate to ensure optimal drying conditions and product quality.
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Item Model |
LPG-5 |
LPG-25 |
LPG-50 |
LPG-150 |
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Inlet temp. ºC |
140~350 |
140~350 |
140~350 |
140~350 |
|
Outlet temp. ºC |
80~90 |
80~90 |
80~90 |
80~90 |
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Max. water evaporation kg/h |
5 |
25 |
50 |
150 |
|
Transmission form of centrifugal atomizer |
Compressed air transmission |
Mechanical transmission |
Mechanical transmission |
Mechanical transmission |
|
Maximum speed (r.p.m) |
25000 |
18000 |
18000 |
15000 |
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Diameter of atomizer (mm) |
50 |
120 |
120 |
150 |
|
Heat source |
Electricity |
Electricity, steam, natural gas, LPG |
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Max. power of electric heater (kw) |
9 |
36 |
72 |
99 |
|
Overall dimensions (LWH) (m) |
1.8*0.93*2.2 |
3*2.7*4.26 |
3.5*3.5*4.8 |
5.5*4*7 |
|
Dry powder recovery rate (%) |
≥95% |
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Note: The amount of water evaporation is related to the characteristics of the material and the temperature of the hot inlet and outlet. |
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