Introduce the vacuum dryer the principle structure, analysis of contrast the vacuum drier in the technical advantages and disadvantages.
   A vacuum dryer is a device by removing the air inside the packaging container reaches a predetermined degree of vacuum after the removal of the inner member of the container moisture. Dry when the tank is in a vacuum, heating jacket through hot water (or steam, thermal oil), with the low-speed rotation of the tank, the material in the water the tank constantly up and down, inside and outside the movement and absorption into the diamond-shaped trajectory "evaporation, continuous discharge of steam through the vacuum line, drying purposes. Built-in spray drying the mixture at the same time, according to customer requirements, filtration, crushing and other devices can achieve its multifunction operation.
  The vacuum dryer Department by the refrigeration system, vacuum system, heating system, electrical instrumentation and control systems. The main components of the oven, condenser, refrigeration units, vacuum pumps, heating / cooling means. Its working principle is to be dried goods first frozen to below the triple point temperature, so that the articles of the solid-state water (ice) and then under vacuum to sublimate directly into steam, and excluded from the article, the article is dried. Material through the pre-treatment, fed into the quick-frozen positions frozen, dry container and then into the sublimation dehydration after post-processing workshop packaging. Vacuum sublimation drying compartment to establish a low-pressure conditions, the heating system to the materials provided to the latent heat of sublimation, refrigeration system to provide the required amount of cold to the cold trap and drying chamber.
  Vacuum dryer has a lot of advantages: drying at low pressure, low oxygen content, can prevent oxidative deterioration of dry material can be dry and inflammable and explosive dangerous goods; vaporization of the moisture in the material at low temperatures, easy to dry heat sensitive materials; dry material in precious and useful ingredients can be recovered; prevent the emissions of toxic and hazardous substances by dry material, can be environmentally friendly types of "green" dry. Therefore, the application of vacuum drying equipment is increasingly widespread.
  Vacuum dryer's main drawback is the need to set the vacuum pumping steam system, makes the investment in equipment with high running high; the equipment production efficiency is low, the output is small. To overcome these shortcomings, many technology workers, made a lot of effort. Meanwhile, since the vacuum drying has many advantages, some products have to adopt the vacuum drying equipment. Therefore, the development of vacuum drying equipment will be promising. 1. Unbalanced development of a continuous vacuum drying equipment at home and abroad as advances in equipment production, ensure product quality, continuous vacuum drying equipment developed in more than a decade ago abroad. Restrictions, but by the level of technology in the country and people are familiar with the concept of development is relatively slow.
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