Study on High Performance Process of Radiant Heat Drying Utilizing Spectral Selectivity and Composition

利用光谱选择性和成分的高性能辐射热干燥工艺研究

• 批准号: 10650742
• 负责人: NISHIMURA Makoto
• 金额: $ 1.79万
• 依托单位: Gifu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650742/
• 关键词: Radiant Heating; Radiant Heat Drying; Spectral Emissivity; Spectral Absorptivity; Far Infrared Heater; Drying of Wetted Particle Layer

Radiant heat drying of a semitransparent and wetted particle layer was analyzed theoretically by using radiant heat flux model in the layer with consideration of spectral emissivity and absorptivity. By numerical calculation of unsteady state heat and mass transfer equations under the various conditions, the time-changes of temperature and moisture content in the layers and the drying rate were obtained. The calculation results were compared with the experimental results for drying of the wetted glass particle layers under the irradiation of an infrared lamp and a far infrared heater. The calculation results agreed fairly with the experimental results, and it was found that the theoretical analysis is valid within the range of present experimental conditions. It was shown that the spectral combination between the radiant source emission and the dried layer absorption, which is based on utilization of spectral selectivity and composition, has a great influence on the effects of internal heating and the performance of drying process.

利用半透明润湿颗粒层的辐射热通量模型，考虑光谱发射率和吸收率，对半透明润湿颗粒层的辐射热干燥进行了理论分析。通过对各种条件下非稳态传热传质方程的数值计算，得到了层内温度、含水率随时间的变化以及干燥速率。将计算结果与在红外灯和远红外加热器照射下干燥润湿玻璃颗粒层的实验结果进行比较。计算结果与实验结果吻合较好，表明在现有实验条件范围内理论分析是有效的。结果表明，基于光谱选择性和成分利用的辐射源发射和干燥层吸收之间的光谱组合对内部加热的效果和干燥过程的性能有很大影响。