Polytechnic University of Valencia Congress, 21st International Drying Symposium

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Study on the general dynamic model of biomass drying processes
Le Wang, Xu Li, Qiaoling Li, Duanfeng Lu, Bin Li, Wnkui Zhu, Mingjian Zhang, Ke Zhang, Nan Deng

Last modified: 02-01-2019

Abstract


Nowadays most studies of drying processes dynamics are established on  empirical models without clear physical meanings, which could not predict the drying characteristic on different dryers. In order to describe the change of temperature and water content in the cut tobacco in different dryers, a mathematical model based on heat and mass transfer phenomena was developed, and the model employed the relationship of equilibrium moisture content and air humidity as basis, the difference of moisture between biomass and wet air as mass transfer driver, and the difference of temperature between biomass and wet air as heat transfer driver. The drying experiments under different air temperature and humidity are carried out on the batch rotary dryer, and the variance of temperature and moisture content in the biomass is obtained by using infrared thermometer and oven. The model is validated by two parameters with experiment data under each condition of air temperature and humidity. The results show that the drying dynamic model is well on accuracy and universality, and it could be applied on different drying device to predict the characteristic of kinds of drying processes.

Keywords: cut tobacco; drying dynamics; equilibrium moisture content; heat transfer; mass transfer.

 

 


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