vClassification of dryers
There is no simple way of classifying drying equipment. Some dryers are con- tinuous, and others operate batchwise; some agitate the solids, and others are es- sentially unagitated. Operation under vacuum may be used to reduce the drying temperature. Some dryers can handle almost any kind of material, while others are severely limited in the type of feed they can accept. ajor divisions may be made among(1)dryers in which the solid is directly exposed to a hot gas (usually air), (2) dryers in which heat is transferred to the solid from an external medium such as condensing steam, usually through a metal surface with which the solid is in contacts and (3) dryers that are heated by dielectric, radi- ant, or microwave energy. Dryers that expose the solids to a hot gas are called adiabatic or direct dryers; those in which heat is transferred from an external medium are known as nonadiobatic or indirect dryers.Some units combine adia- batic and nonadiabatic drying; they are known as direct-indirect dryers.
vClassification of dryers There is no simple way of classifying drying equipment. Some dryers are con- tinuous, and others operate batchwise; some agitate the solids, and others are es- sentially unagitated. Operation under vacuum may be used to reduce the drying temperature. Some dryers can handle almost any kind of material, while others are severely limited in the type of feed they can accept. ajor divisions may be made among(1)dryers in which the solid is directly exposed to a hot gas (usually air), (2) dryers in which heat is transferred to the solid from an external medium such as condensing steam, usually through a metal surface with which the solid is in contacts and (3) dryers that are heated by dielectric, radi- ant, or microwave energy. Dryers that expose the solids to a hot gas are called adiabatic or direct dryers; those in which heat is transferred from an external medium are known as nonadiobatic or indirect dryers.Some units combine adia- batic and nonadiabatic drying; they are known as direct-indirect dryers.
การแปล กรุณารอสักครู่..