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隧道式干燥机 我有新说法
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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。

目录

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,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。

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,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,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。

参考资料

参考资料编辑区域


目录
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自然循环蒸发器中溶液靠料液密度差循环。为了防止结垢和晶析,加热管应在*浸没状态下操作。这种蒸发器适用于结垢不严重和腐蚀性较小溶液的浓缩。","ClassName":"蒸发器","HitNumber":"1127","Type":"","ShowPrice":"0.00","MarketPrice":"5000","Price":"5000"},{"BaikeID":"1937","ProductID":"5404065","Name":"转让闲置二手旋转蒸发器","CompanyID":"182561","ClassID":"2337","PictureDomain":"img66","Picture":"4b8cd55bb9473d45ae9bbf22fcfe7c083762e1cd80d8955f5ec699c3631b988d20af793cf0ea8720.jpg","UserID":"202917","Descrip":"转让闲置二手旋转蒸发器
旋转蒸发器主要用于医药、化工和生物制药等行业的浓缩、结晶、干燥、分离及溶媒回收。其原理为在真空条件下,恒温加热,使旋转瓶恒速旋转,物料在瓶壁形成大面积薄膜,高效蒸发。","ClassName":"蒸发器","HitNumber":"1058","Type":"","ShowPrice":"0.00","MarketPrice":"5000","Price":"5000"},{"BaikeID":"1937","ProductID":"5404041","Name":"转让闲置二手四效降膜蒸发器","CompanyID":"182561","ClassID":"2337","PictureDomain":"img66","Picture":"4b8cd55bb9473d45ae9bbf22fcfe7c0813cbb368d4dff81dd7900c768bc5474a983f027e8c1e12a0.jpg","UserID":"202917","Descrip":"转让闲置二手四效降膜蒸发器
单效或多效降膜蒸发器,适用于牛奶、葡萄糖、淀粉、木糖、制药、化工、生物工程、环保工程、废液回收等行业进行低温连续式蒸发浓缩,具有传热效率高,物料受热时间短等主要特点,所以特别适用于热敏性、粘滞性、发泡性等物料","ClassName":"蒸发器","HitNumber":"955","Type":"","ShowPrice":"0.00","MarketPrice":"5000","Price":"5000"},{"BaikeID":"1937","ProductID":"5404010","Name":"转让闲置二手双效蒸发器","CompanyID":"182561","ClassID":"2337","PictureDomain":"img66","Picture":"4b8cd55bb9473d45ae9bbf22fcfe7c089c0ba5fab1ee32ca4f9dc0f272c44f9ea8c9b34724ffcc84.jpg","UserID":"202917","Descrip":"转让闲置二手双效蒸发器
蒸发器是制冷四大件中很重要的一个部件,低温的冷凝液体通过蒸发器,与外界的空气进行热交换,气化吸热,达到制冷的效果。","ClassName":"蒸发器","HitNumber":"969","Type":"","ShowPrice":"0.00","MarketPrice":"5000","Price":"5000"}]