Freeze dryer vs dehydrator
What is a freeze dryer?
The freeze dryer is composed of refrigeration system, vacuum system, heating system, electrical instrument control system. The main components of the freeze dryer are drying box, condenser, refrigeration unit, vacuum pump, heating/cooling device, etc. The working principle of the freeze dryer is to freeze the dried items to below the triple point temperature, and then directly sublime the solid water (ice) in the items into water vapor under vacuum conditions, remove them from the items, and dry the items . After pre-processing, the materials are sent to the quick-freezing warehouse for freezing, then sent to the drying warehouse for sublimation and dehydration, and then packaged in the post-processing workshop. The vacuum system establishes low-pressure conditions for the sublimation drying chamber, the heating system provides sublimation latent heat to the material, and the refrigeration system provides the required cold energy to the cold trap and drying chamber.
Advantages of freeze drying:
1. It is dried at low temperature, without denaturing or losing biological vitality of proteins and microorganisms. This is especially suitable for dry storage of heat-sensitive substances, such as vaccines, fungi, virus seeds, blood products, etc.
2. Due to the low temperature drying, the loss of volatile components and heat-denatured nutrients in the substance is small. It is chemical products and medicines.
And high-quality drying methods for food.
3. During the low-temperature drying process, the growth of microorganisms and the action of enzymes can hardly proceed, and the original properties of the material can be best maintained.
4. The volume and shape are basically unchanged after drying, and the material is sponge-like without drying shrinkage; when rehydrating, the contact surface with water is large and can be quickly restored
Into the original traits.
5. Because it is dried under vacuum, there is very little oxygen, so that easily oxidized substances are protected.
6. It can remove 95~~99% of the water in the material, and the product has a long shelf life.
The scope of application of freeze drying:
1. Biological products and pharmaceuticals: such as antibiotics, antitoxins, diagnostic supplies and vaccines.
2. Microorganisms and algae: such as yeast, enzymes, protozoa, microalgae, etc.
3. Biological specimens and living tissues: such as the production of various animal and plant specimens, and dry preservation of the skin used for animal xenotransplantation or homotransplantation
Marginal tissues such as layer, cornea, bone, aorta, heart valve, etc.
4. Make small tissue pieces for optical microscopes, electronic scanning and projection microscopes.
5. Food drying: such as coffee, tea, fish, meat and eggs, seaweed, fruits, vegetables, spices, tofu, convenience foods, etc.
6. Advanced nutrition and Chinese herbal medicine: such as royal jelly, honey, pollen, Chinese herbal medicine preparations, etc.
What is a dehydrator?
The food dehydrator is a small household appliance that can dry fresh food by itself. It has a variety of sizes and properties, and can dry fruits, vegetables and meat. They work by heating air very gently and blowing it into the entire food drying area. This may take hours or even days to fully dry and preserve juicy items.
The food dehydrator blows upward from the bottom heating element, or the heater placed horizontally on the side. The advantage of horizontal flow is that you can dry a batch of mixed things without worrying about the taste of the mixture; for example, your dried apples will taste like dried beef. If this is not a problem, then the bottom heating dehydrator should be able to provide you with adequate service.
The scope of application of dehydrator:
Mainly used in the dehydration process of various industrial, agricultural products and daily necessities. It is used for the final process after cyclic rough washing, crushing washing, and rinsing to replace manual fishing, and adds a first-level washing and automatic high-speed dehydration function, so as to achieve the obvious purpose of saving labor, improving cleaning quality, and saving power consumption. It is matched with the automatic conveying device to form a higher level of automated assembly line production. The purpose of the screw extrusion dehydrator is (cassava residue dehydrator) can be widely used in the dehydration operation of high-humidity slag materials before drying, such as the dehydration of distiller's lees, pomace, medicine residue, cassava residue, etc., which can remove 20% of the material The moisture of the left and right greatly reduces the burden of the dryer, the output is greatly increased, and the energy consumption is greatly reduced. It is an indispensable processing equipment for high-humidity materials before drying. After dehydration, the materials can directly enter the drying equipment, which greatly reduces Drying energy consumption.
