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操作压力对过热蒸汽流化床干燥的影响

, PP. 1375-1380

Keywords: 农业工程,最佳操作压力,过热蒸汽流化床干燥,数值模拟

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Abstract:

针对操作压力对过热蒸汽流化床干燥过程中蒸汽-颗粒物料两相流动特性、传热传质特性的影响具有非线性特征问题,基于油菜籽过热蒸汽流化床干燥过程的轴对称二维非稳态数学模型,仿真研究了操作压力对颗粒物料干燥动力学的影响规律,对负压、常压附近和高压环境下操作压力与最大干燥速率之间的关系进行了定量分析,并得到了进口过热蒸汽温度和流速设定条件下颗粒物料过热蒸汽流化床干燥的最佳操作压力参数值。数值模拟结果表明:进口过热蒸汽温度358K、流速2.5m/s、颗粒物料直径1.0mm时,过热蒸汽流化床干燥最佳操作压力为0.02MPa;进口过热蒸汽温度403K、流速2.5m/s、颗粒物料直径1.0mm时,最佳干燥操作压力为0.10MPa;进口过热蒸汽温度443K、流速2.0m/s、颗粒物料直径2.0mm时,最佳干燥操作压力为0.2MPa。

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