Freeze dryer is a kind of equipment widely used in food, medicine, chemical industry and other fields, it realizes the drying of materials by freezing materials and reducing environmental pressure. This article will introduce the principle, application, and maintenance of freeze dryers in detail.
Second, the principle of freeze dryer.
Freezing process. The freeze dryer first freezes the material so that the moisture in it freezes. This process is usually carried out at low temperatures to ensure that the water molecules do not damage the structure of the material during the formation of ice crystals.
Sublimation drying. When the material is frozen, it is placed in a vacuum. Under vacuum, the ice crystals change directly from a solid state to a gaseous state, i.e. the sublimation process. This process removes the moisture from the material and brings it to a dry state.
Resolve drying. After the sublimation drying is completed, the free water in the material has been removed. However, there may also be some bound water, which needs to be heated to resolve it from the material and reach a completely dry state.
3. Application of freeze dryer.
Food industry. In the food industry, freeze dryers are widely used to make convenience foods, instant foods, and preserve the original color, flavor and shape of food. For example, products such as instant noodles and instant coffee are produced through the freeze-drying process.
Pharmaceutical industry. In the pharmaceutical industry, freeze dryers are mainly used for the storage and transportation of medicines. Through the freeze-drying process, the shelf life of the drug can be extended and the stability of the drug during transportation can be guaranteed.
Chemical industry. In the chemical industry, freeze dryers can be used to produce solid chemical reagents, catalysts, etc. Through the freeze-drying process, solid products with excellent physical and chemical properties can be obtained.
Fourth, the maintenance of the freeze dryer.
Check the vacuum level regularly: The vacuum level is one of the key factors affecting the freeze drying effect. Regularly check the vacuum level to ensure that it is within the specified range to ensure the normal operation of the equipment.
Cleaning the condenser: The condenser is one of the important components of the freeze dryer, which is responsible for condensing the sublimated water vapor into liquid water. Clean the condenser regularly to ensure that it dissipates heat well and prevents fouling and clogging.
Check the heating element: The heating element is a key component that controls the temperature of the material. Regularly check the integrity of the heating element to ensure that it is working properly and avoid material damage or equipment damage due to heating element failure.
Maintenance of the vacuum pump: The vacuum pump is an important component in maintaining the vacuum environment. Maintain your vacuum pump regularly to ensure its proper operation and avoid a drop in vacuum level or equipment downtime due to a malfunctioning vacuum pump.
Regular dust removal: The freeze dryer will produce dust and impurities during the working process. Dust removal regularly to keep the inside of the equipment clean to ensure the normal operation of the equipment and prolong the service life.
Record operation data: Record the operation data of the equipment, including temperature, pressure, vacuum and other parameters, which helps to find equipment failures and problems in time, and take corresponding measures for repair and maintenance.
Train operators: train operators to familiarize themselves with the operating procedures and precautions of the equipment, and avoid equipment damage or accidents caused by improper operation.
Regular maintenance: According to the use of the equipment and the manufacturer's recommendations, regular maintenance and maintenance of the equipment is carried out, including replacing worn parts, cleaning the inside of the equipment, etc., to ensure the normal operation of the equipment and prolong the service life.