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Published on: June 15, 2014
Research on the water absorption diffusion model and kinetics of pretreated straw
Lei Song1,2, Yuanna Li1,2, Tingzhou Lei1,2
1Institute of Urban and Rural Mining, Changzhou University, Changzhou, 213164, China.
Abstract:
To study the water absorption characteristics of corn, rice, and wheat straw after thermal pretreatment (120 ~ 200 °C). This work introduces an internal particle diffusion model for the moisture adsorption mechanism and measures the water contact angle to assess hydrophobicity, establishing a linear relationship between the water absorption kinetic parameters and temperature. The results show that when the temperature rises to 200 °C, the hygroscopicity reduction extent of corn straw, rice straw and wheat straw are 58.45%, 28.32% and 12.12%, respectively, significant increase in hydrophobicity. The three-stage internal particle diffusion equation can effectively describe the adsorption process of straw to moisture. At 70% humidity, the diffusion rate constant decreased and the boundary layer thickness increased. The ASABE equation can accurately predict the moisture content of corn straw; the water absorption process of rice and wheat straw conforms to the Peleg equation, which is significant for the subsequent large-scale high-quality utilization of straw.
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