吉林大学学报(工学版) ›› 2015, Vol. 45 ›› Issue (4): 1375-1380.doi: 10.13229/j.cnki.jdxbgxb201504050

• • 上一篇    

操作压力对过热蒸汽流化床干燥的影响

肖志锋1, 乐建波1, 吴南星1, 刘相东2   

  1. 1.景德镇陶瓷学院 机电学院,江西 景德镇 333403;
    2.中国农业大学 工学院,北京 100083
  • 收稿日期:2013-11-07 出版日期:2015-07-01 发布日期:2015-07-01
  • 作者简介:肖志锋(1980-),男,副教授,博士.研究方向:现代干燥技术及理论.E-mail:cauxiao@126.com
  • 基金资助:
    国家自然科学基金项目(51306083); 江西省自然科学基金项目(20132BAB216010)

Effect of operation pressure on superheated steam fluidized bed drying

XIAO Zhi-feng1, LE Jian-bo1, WU Nan-xing1, LIU Xiang-dong2   

  1. 1.School of Mechanical and Electronic Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, China;
    2.College of Engineering, China Agricultural University, Beijing 100083, China
  • Received:2013-11-07 Online:2015-07-01 Published:2015-07-01

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摘要： 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358 K、流速2.5 m/s、颗粒物料直径1.0 mm时,过热蒸汽流化床干燥最佳操作压力为0.02 MPa;进口过热蒸汽温度403 K、流速2.5 m/s、颗粒物料直径1.0 mm时,最佳干燥操作压力为0.10 MPa;进口过热蒸汽温度443 K、流速2.0 m/s、颗粒物料直径2.0 mm时,最佳干燥操作压力为0.2 MPa。

关键词: 农业工程, 最佳操作压力, 过热蒸汽流化床干燥, 数值模拟

Abstract: In superheated steam fluidized bed drying, the operation pressure significantly influences the heat and mass transfer and the steam-particle two-phase flow with nonlinear characteristics. Base on the two-dimensional unsteady model of drying process of rapeseeds, numerical simulation was carried out to investigate the influence of operation pressure on the kinetics of superheated steam fluidized bed drying. Under negative pressure, near atmospheric pressure and high pressure, the relationship between the operation pressure and maximum drying rate was quantitatively analyzed respectively. For superheated steam fluidized bed drying of granular products with the inlet steam temperature and flow rate, the values of the optimal operation pressure were obtained. Simulation results show that, with inlet steam temperature of 358 K, flow velocity of 2.5 m/s and particle diameter of 1.0 mm, the optimal pressure is 0.02 MPa; with inlet steam temperature of 403 K, flow velocity of 2.5 m/s and particle diameter of 1.0 mm, the optimal pressure is 0.1 MPa; with inlet steam temperature of 443 K, flow velocity of 2.0 m/s and particle diameter of 2.0 mm, the optimal pressure is 0.2 MPa.

Key words: agricultural engineering, optimum operating pressure, superheated steam fluidized bed drying, numerical simulation

中图分类号: 

  • S226.6
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