| 摘要: |
| 为探索节能型的冷冻干燥方式,进行了在常压下利用流化床中吸附剂吸附水分同时放出热量实现冷冻干燥的 研究。以粒状物料为例,建立了球坐标下常压冷冻干燥的传热过程理论模型,计算了物料干燥过程中的温度和升华 界面的移动距离,并对床温,物料尺寸和吸附剂粒径等影响因素进行了理论分析。实验测量了物料内的温度分布变 化,验证了数学模型的可靠性。结果表明,通过适当提高床温、采用小尺寸物料和吸附剂,可以提高干燥速率。 |
| 关键词: 冷冻干燥 吸附 流化 传热传质 常压 |
| DOI： |
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| Theoretical analysis of heat transfer of adsorption fluidization freeze-dryii^ at atmospheric pressure |
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FENG Hong-qing1,LI Wei-yi2
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(1. College of Transport & Storage and Cwii Engineering in China University of Petroleum，Dongying^ 257061，Shandong Province, China ;2.College of Mechanical Engineering, Tianjin University, Tixir^in 300072, China )
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| Abstract: |
| Freeze-drying at atmospheric pressure is a new way to reduce energy consumption. In this process the adsorbent m fluidized bed absorbs water steam and gives out Accounting for tlie characteristics of freeze-drying of granular malerial, a theoretical heat transfer model of atmospheric freeze-drying in spherical geometry was developed. The temperature distribution and movement distance of sublimation inteiface were calculated，then the speed of diying process can be deduced. Theoretical analysis was done on influence factors such as bed temperature，material size and adsorbent diameter. The temperature diBtribution in the freezing material was measured experimentally. The mathematical model was verified. The results show ikat the diying rate can be increased by improving bed temperature or using small material and adsorbent. |
| Key words: Stfreeze drying adsoiption fluidization Keat and mass transfer atmospheric pressure |
