How to choose the right drying equipment and drying technology In the drying process of materials, different material characteristics are different, drying requirements are different, drying methods are also different, how to choose the right drying equipment?
Identifying the drying properties of a material is of paramount importance when selecting a drying equipment process. The material can be divided into both hygroscopic and non-hygroscopic. Hygroscopic materials absorb moisture from the surrounding environment, and non-hygroscopic materials do not absorb moisture from the environment. For non-hygroscopic materials, the moisture present in any environment remains on the surface, becoming "surface moisture" and easily removed. However, colloidal particles made of non-hygroscopic materials may also become hygroscopic due to the action of additives or fillers.
In addition, the calculation of the energy consumption of a drying process may be related to the complexity of the processing and other factors, so the values ​​presented here are for reference only.
Convection dryers For non-hygroscopic materials, they can be dried using a hot air dryer. Because moisture is only loosely constrained by the interfacial tension between the material and water, it is easy to remove. The principle of such machines is to use a fan to absorb the air in the environment and heat it to the temperature required to dry the particular material. The heated air passes through the drying hopper and convectively heats the material to remove moisture.
For the drying of hygroscopic materials, microwave drying equipment is generally used: *The drying section is focused on the inside of the material; the second drying section evaporates the moisture on the surface of the material, and the drying speed is slowly reduced, and the dried material is dried. The temperature begins to rise; at a later stage of the Zui, the material reaches a moisture absorption equilibrium with the dry gas. At this stage, the temperature difference between the inside and outside will be eliminated.
Currently, the common method of producing dry air is to utilize a dry gas generator. The device is centered on an adsorptive dryer consisting of two molecular sieves where the moisture in the air is absorbed. In the dry state, air flows through the molecular sieve, and the molecular sieve absorbs moisture in the gas to provide dehumidification gas for drying. In the regenerated state, the molecular sieve is heated to the regeneration temperature by hot air. The gas flowing through the molecular sieve collects the removed moisture and brings it to the surrounding environment. Another method of generating a dry gas is to reduce the pressure of the compressed gas. The benefit of this approach is that the compressed gas in the supply network has a lower pressure dew point. After the pressure is reduced, the dew point reaches about 0 °C. If a lower dew point is desired, a membrane or adsorption dryer can be used to further reduce the dew point of the air before the compressed air pressure is reduced.
In dehumidified air drying, the energy required to produce a dry gas must be extra calculated. In adsorption drying, the regenerated molecular sieve must be heated from the dry state (about 60 ° C) to the regeneration temperature (about 200 ° C). To this end, it is common practice to continuously heat the heated gas through the molecular sieve to the regeneration temperature until it reaches a certain temperature as it leaves the molecular sieve. Theoretically, the energy necessary for regeneration consists of the energy required to heat the molecular sieve and the water adsorbed inside it, the energy required to overcome the adhesion of the molecular sieve to water, the energy necessary to evaporate the water and the temperature of the water vapor.
Female Health Plant Extract
Female Health Plant Extract,Saw Palmetto Extract,Saw Palmetto Extract Powder,Saw Palmetto Fruit Extract
Youth Biotech CO,. Ltd. , https://www.youtherb.com