食物可以在空气、过热蒸汽、真空、惰性气体中干燥，可以用直接加热干燥。
Foodstuffs may be dried in air, superheated steam, in vacuum, in inert gas, and by the direct application of heat.
当比较流化床干燥机真空干燥可直接一热机，如直接加热烘干机或旋转，记住一定的局限性。
When comparing a vacuum dryer with a direct-heat dryer, such as a direct-heat rotary dryer or fluid bed dryer, keep some limitations in mind.
我们生产的直接和间接的空气加热器用于为工业干燥机加热新鲜空气或过程空气。
ComEnCo manufactures direct and indirect air heaters heating fresh air or process air for industrial dryers.
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