Superheated Steam Drying shortcomings
    (A) the complexity of superheated steam drying equipment, large investment. In principle, any air dried for dryer effects may be replaced with superheated steam dryer drying medium. However, the use of superheated steam drying, not a gas leak, feeding and unloading can not have air infiltration. Require complex feeding systems and products collection system. Sometimes exhaust recovery system. Therefore, the equipment cost is high. Some scholars have proposed superheated steam drying feeding system and product collection system will account for a large spending the entire device. In addition, some material on machinery and equipment requiring high material. Cases against corrosion and rust sodium stainless materials where required. It is due to the complexity of the device has also led to superheated steam drying higher maintenance costs.
    (2) superheated steam drying up and parking is easy to produce condensation. Superheated steam drying temperature exceeds 100 ℃, when the atmospheric temperature conditions, feed materials, it is heated in the evaporator temperature condensation process will be generated. Trommelen and crosby studies show that an initial temperature of 10 ℃ water droplets exposed to 150 degrees, 0.1MPa superheated steam under pressure, weight increase of 12.5%. This means that the drying time should be lengthened to allow the condensed water to be removed. For the initial moisture content of the material is low, this part of the condensed water to be evaporated representing a large portion of water, which will significantly increase the drying time. For example, the initial moisture content of 10% sand placed 30 ℃ 150 ℃ superheated steam will increase by 40% moisture. In addition, starting and stopping of the dryer, this condensation occurs often. Therefore, superheated steam drying temperature on the material feed have higher requirements.
    (3) is not suitable for superheated steam drying heat-sensitive materials. As superheated steam drying material temperature exceeds l00 ℃, which for some sensitive materials is not appropriate. For example, in more than 100 ℃ under the conditions. Some materials produce melting, some wood also produces undesirable discoloration of the product level drop. If operating under vacuum, although the cause of product quality is guaranteed, but will significantly increase the cost of equipment and the complexity of the operation. This is superheated steam drying is not the main reason for large-scale applications in general.
    (4) The superheated steam drying material to be dried as it involves the balance and superheated steam, and in some cases, some of the material is difficult to obtain a lower moisture content.
    (5) The material superheated steam drying equipment if you choose incorrectly corrosion or rust damage is easy to produce the phenomenon.
    (6) steam cleaning, compression, recycling and re-heating can not be ignored.

 

主要产品推荐： 烘干机  干燥机  杀菌机  微波设备