Products Description

The working principle of the milk spray dryer is based on the physical principles of evaporation and atomisation. Firstly, the pre-treated liquid milk is conveyed to the feed system of the spray dryer. In the spray chamber, the liquid milk is converted into extremely small droplets by means of specially designed atomisers. The diameter of these droplets is usually in the order of tens of microns or even smaller, which greatly increases the surface area of the liquid. Hot air is then introduced into the drying chamber and this hot air flows through the chamber at high speed and in a uniform manner. When the tiny milk droplets meet the hot air, a strong heat exchange occurs instantly, and the water on the surface of the milk droplets evaporates rapidly, forming water vapour. Due to the tiny size and large surface area of the droplets, water can diffuse from the inside of the droplets to the surface and evaporate in a very short time. With the rapid evaporation of water, the solid components in the milk droplets are gradually concentrated and eventually form milk powder particles.

Products details

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.

Equipment composition

The milk spray dryer is mainly composed of the following parts:

Milk storage tank: used to store the liquid milk to be processed.
Feed high-pressure pump: conveys liquid milk to the feed system of the spray dryer.
Atomiser: Converts the liquid milk into tiny droplets.
Hot air generator: provides high temperature air for evaporation of the droplets.
Drying chamber: allows the hot air to come into full contact with the well atomised milk droplets to complete the drying process.
Collector: Located at the bottom of the drying chamber, it is used to collect the dried milk powder particles.
Wet Air Exhauster: Exhausts the used wet air out of the system.