Spray dryer
Brief introduction:
A spray dryer is capable of atomizing the feed liquid into droplets, thereby increasing the specific surface
area. These droplets come into contact with hot air and transform into dry powders. Spray drying can be
applied to emulsions, suspensions, pastes, colloidal liquids, and other liquid materials.
Selection of spray system:
The spray drying system consists of a drying chamber (tower), a liquid nebulization system, an air heater,
and a tail gas recovery device. The selection of the structure, size of the system, and method of air heating,
tail gas recovery, and nebulization (centrifugal or pressurized) should be based on the drying properties of
the material.
Centrifugal spray dryer:
1. How does a centrifugal spray dryer work?
The hot air rises to the top of the drying chamber and enters a hot air dispenser that evenly distributes
spiral hot air inside the chamber. The material is pumped into a high-speed centrifugal nebulizer installed at
the top of the chamber. The tiny droplets come into contact with the hot air, causing rapid evaporation of
moisture content, resulting in instantaneously obtaining dry powders.
2. What are the advantages of a centrifugal spray dryer?
A. Rapid desiccation; reduced production costs; improved product quality.
B. RPM can be adjusted continuously; dry powders can have controllable granularity.
C. The product has a quasi-globular and even-granular shape, with good flowability, solubility, and purity.
D. The nebulizing disc has a slow abrasion rate.
3. Specification Graph:
Pressurized spray dryer:
1. How does a pressurized spray dryer work?
Using a high-pressure pump or high-pressure air, the liquid feed is atomized into droplets that rapidly
flow in a counterflow manner with the hot air, leading to instant production of granular products.
2. What are the advantages of a pressurized spray dryer?
A. The nozzle has a simple structure, requiring low nebulization power and convenient maintenance.
B. It is applicable to the desiccation of low-viscosity liquid materials.
C. It is capable of producing relatively large granules.
D. It is suitable for heat-sensitive materials.
3. Specification Graph:
Typical forms of the spray dryer:
Application industries:
1. Chemical industry.
2. Food industry.
3. Dairy industry.
4. Medical industry.
5. Architectural material industry.
6. Environmental protection industry.
Application examples:
1. Baotou Qitong rare earth Ltd.
2. Liaoyang Hongfa food Ltd.
Other related pictures at application sites:
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