China's recent emerging feed drying method
Vacuum freeze-drying We know that the solid, liquid and gas states of water are determined by pressure and temperature. When the pressure drops to 610Pa and the temperature is 0.0098°C, the three states of water can coexist. This state point is the three-phase equilibrium point. When the pressure is lower than 610 Pa, the liquid state of water cannot exist regardless of temperature changes. If the ice is heated at this time, the ice can only sublimate directly into the gaseous state over the liquid state. Similarly, the same result can be obtained if the pressure is kept constant while maintaining the temperature. Vacuum freeze-drying is based on the nature of water, the use of refrigeration equipment will freeze the material into a solid, and then evacuated into a vacuum so that the solid ice directly sublimated into a gaseous vapor, so as to achieve the purpose of drying. The advantages of freeze-drying are many: the material under low pressure is not easy to oxidize and degenerate and inhibit the vitality of some cells; the heat-sensitive components in the material remain at low temperature, and the original components in the material can be retained to the utmost; the skeleton is formed during pre-freezing, and can be maintained after drying. The original shape of the material forms a multi-microporous structure; the rehydration is good, and the water can be quickly restored, and its quality is basically the same as before drying. The application range of freeze-drying is very extensive, but its cost is relatively high, so when choosing freeze-drying, we must consider the economic benefits, and we should not blindly adopt it. At present, vacuum freeze-drying technology is mainly used in food, medicine and feed additives. Superheated steam drying Superheated steam drying technology is a new energy-saving drying method. It is a dry method of removing moisture by direct contact with wet materials using superheated steam. Compared with traditional hot air drying, superheated steam drying uses water vapor as the drying medium. The exhaust gas exhausted by the dryer is also all water vapor, so only one gaseous component exists in the drying process, so the mass transfer resistance is very small. At the same time, the temperature of the discharged exhaust gas is kept above 100° C., so it is easy to recover, and the latent heat of the steam can be recovered by means of condensation, compression, and other methods, and the heat efficiency is high. In addition, since the heat capacity of water vapor is twice as large as that of air, the consumption of drying medium is significantly reduced, so the unit energy consumption is low. The overheating and drying technology has many advantages: large heat transfer coefficient, low mass transfer resistance, low steam consumption, no risk of explosion and fire, environmental protection, sterilization and sterilization. However, the superheated steam drying also has a certain range of application, and it is not suitable for the heat-sensitive material to be dried. If the recycling is unfavorable, the energy-saving effect will be greatly affected, and the cost thereof is also relatively high. In the feed industry, superheated steam drying technology can be applied to distillers grains, grasses, fish bones and fish. News link: The purpose of feed drying is to remove excess moisture from feed ingredients for packaging, transportation, storage, processing, and use. Drying is a complicated process. Different drying methods have different drying methods. Therefore, a reasonable drying method must be determined according to the different composition and characteristics of the feed. There are many classification methods of dryers, and they are classified according to the structure of dryers. The commonly used dryers include: spray dryers, fluidized bed dryers, air dryers, rotary drum dryers, drum dryers, infrared dryers, and high dryers. Frequency dryers. These dryers have been widely used in the feed drying industry and have greatly supported the development of the feed industry. Its structure and working principle are well known to us. This article will introduce several new drying methods and dryers so that everyone can understand the development direction and prospects of the dryer. Knitted Wide Leg Pants
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