What is the principle and characteristics of automatic vacuum freeze dryer?

The lyophilized product is put into the drying bin, the drying bin is connected with the condenser, the vacuum pump is connected with the drying bin and the condenser, the vacuum pump is opened, when the drying bin reaches the set pressure, the water volatilizes and is captured by the condenser, this process is sublimation. Sublimation, as the name suggests, refers to the direct conversion of a liquid from a solid state (ice) to a gaseous state, and then solidifies in a condenser. After that, the product is slowly warmed to remove the moisture completely.

Advantages of the freeze dryer: Since the drying is carried out in the frozen state, the volume is almost unchanged, the original structure is maintained, and the concentration phenomenon does not occur. Since drying takes place under a vacuum, there is very little oxygen, so some substances that are susceptible to oxidation are protected.

Drying can remove more than 95-99% of the water, so that the dried product can be stored for a long time without deterioration. The lyophilized product can be stored at room temperature without spoiling. Because freeze-drying and packaging isolate water and oxygen from food spoilage.

The vacuum freeze dryer is suitable for the drying of high-grade APIs, Chinese medicine decoction pieces, biology, wild vegetables, dehydrated vegetables, food, fruits, chemicals, pharmaceutical intermediates and other materials. Freeze vacuum drying is a new type of box structure launched by Quan's Food Machinery (Shanghai) **** vacuum freeze dryer that combines refrigeration system, vacuum system, heat conduction oil heating system and dehumidification system, and makes greater use of the space for storing materials in the box for dryingThe vacuum freeze dryer is suitable for the drying of high-grade APIs, Chinese medicine decoction pieces, seafood, wild vegetables, dehydrated vegetables, food, fruits, chemical drug intermediates and other materials.

The vacuum freeze dryer combines the refrigeration system, the vacuum system, the heat conduction oil heating system and the dehumidification system, a new type of box structure, which makes greater use of the space for storing materials in the box for drying, which can make the powder have good dispersion after drying. <>

Freeze drying is a technical method to prefreeze water-containing items, and then hand over their moisture to sublimate in a vacuum state to obtain dry items. Freeze-dried items are easy to store for a long time, and can be restored to the state before freeze-drying and retain the original biochemical properties after adding water. For heat-sensitive substances such as antibiotics, vaccines, blood products, enzyme hormones and other biological products, freeze-drying technology can show its superiority.

Beijing Detianyou FD series freeze dryer adopts air-cooled condensing refrigeration system, stainless steel structure, transparent drying chamber, which is convenient for observing the whole process of freeze-drying.

The S series in the FD series has the function of programmable control of shelf heating, using PID adjustment, precise temperature control, and the man-machine interface adopts a large-screen LCD screen, which provides users with more information about the lyophilization process in the form of curves and data, and is equipped with a host computer communication interface.

At low temperatures, the water is drained so that its components are not destroyed.

Is it an air compressor, is it used on the pipeline?

It is used to condense water in the air, and the presence of water will affect the effect of painting.

1. From physics, it can be seen that water has three phases, O point is the three-phase common point, and O is the melting point of ice. According to the principle of decreasing pressure and decreasing boiling point, as long as the pressure is under the pressure of the three-phase point, the moisture in the material can be directly sublimated from water to water vapor without passing through the liquid phase.

2. According to this principle, the wet raw materials of the food can be frozen below the freezing point first, so that the moisture in the raw materials can be turned into solid ice, and then the ice can be directly converted into steam and removed in the appropriate vacuum environment, and then the water vapor condenser in the vacuum system will be used to condense the water vapor, so that the materials can be dried. This method of obtaining drying by vacuum freezing is the process of change and movement of water, which occurs at low temperature and low pressure, therefore, the basic principle of freeze drying is the mechanism of heat and mass transfer at low temperature and low pressure.

The working principle of the refrigeration dryer is to cool the compressed air through the heat exchange of the evaporator according to the principle of refrigeration and dehumidification, so that the gaseous water and oil in the compressed air are cooled by isobaric pressure and condensed into liquid water and oil, which are discharged outside the system through the automatic drainer, so as to obtain clean compressed air.

Features of refrigeration dryer:

1. Rotary or scroll fully enclosed refrigeration dryer is adopted, which has stable operation, reliable performance and long power-saving life;

2. Small size, compact structure, stainless steel or carbon steel galvanized cylinder material, which can avoid secondary pollution of compressed air;

3. The refrigeration control element adopts advanced refrigeration components, which has excellent performance and has the throttle and pressure reduction of the thermodynamic expansion valve.