简介
隧道干燥机是一种利用热能降低物料水分的机械设备，用于对物体进行干燥操作，干燥机通过加热使物料中的湿分（一般指水分或其他可挥发性液体成分）汽化逸出，以获得规定湿含量的固体物料，干燥的目的是为了物料使用或进一步加工的需要 金牌影院电视剧免费播放在线观看全集。
1原理
干燥过程需要消耗大量热能，为了节省能量，某些湿含量高的物料，含有固体物质的悬浮液或溶液一般先经机械脱水或加热蒸发，再在干燥机内干燥 金牌影院电视剧免费播放，以得到干的固体。
在干燥过程中需要同时完成热量和质量（湿分）的传递，保证物料表面湿分蒸汽分压（浓度）高于外部空间中的湿分蒸汽分压，保证热源温度高于物料温度 金牌影院看电视剧免费。
热量从高温热源以各种方式传递给湿物料，使物料表面湿分汽化并逸散到外部空间，从而在物料表面和内部出现湿含量的差别，内部湿分向表面扩散并汽化，使物料湿含量不断降低 金牌影院在线观看，逐步完成物料整体的干燥。
物料的干燥速率取决于表面汽化速率和内部湿分的扩散速率，通常干燥前期的干燥速率受表面汽化速率控制，而后，只要干燥的外部条件不变 金牌影院官网首页入口，物料的干燥速率和表面温度即保持稳定，这个阶段称为恒速干燥阶段，当物料湿含量降低到某一程度，内部湿分向表面的扩散速率降低，并小于表面汽化速率时，干燥速率即主要由内部扩散速率决定，并随湿含量的降低而不断降低，这个阶段称为降速干燥阶段。
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