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粮食干燥体系熵平衡方程及(火用)特征研究

发表时间:2010-09-30  浏览量:1272  下载量:607
全部作者: 李格萍,李长友
作者单位: 华南农业大学工程学院
摘 要: 粮食干燥是由做功引起的物质迁移或传递过程,推动干燥过程进行的条件是(火用)。研究给出了粮食深床干燥的物理模型,基于物理模型建立粮食深床干燥的质平衡方程、能量平衡方程,利用非平衡热力学的熵产和熵流理论,建立粮食干燥体系熵平衡方程,导出熵产生率密度表达式,说明粮食干燥体系的(火用)特征。为评价粮食干燥系统能量结构及合理利用提供了理论分析和评价方法。
关 键 词: 农业工程;粮食干燥;火用;(火用)特征
Title: Study on entropy balance equation and exergy characteristics of grain drying system
Author: LI Geping, LI Changyou
Organization: College of Engineering, South China Agricultural University
Abstract: Grain drying is the process of mass remove or transfer caused by power, and exergy is the condition of promoting the drying process. To evaluate the energy structure features of grain drying system, physical model of grain deep-bed drying was given, based on in-depth analysis of the thermodynamics for grain drying system, the mass balance equation, energy balance equation were established. Based on the entropy production and entropy flux theories of the non-equilibrium thermodynamics, grain drying system entropy balance equation was established and the expression of entropy production rate density was deduced. Based on the exergy characteristics of grain drying system, the exergy balance equations were established, the exergy flux density expression of drying air and grain was deduced. On the basis of this, the transferring and conversion laws of exergy of drying air and grain were analysed and discussed in the condition of hot air drying and natural air drying.
Key words: agricultural engineering; grain drying; exergy; exergy characteristics
发表期数: 2010年9月第18期
引用格式: 李格萍,李长友. 粮食干燥体系熵平衡方程及(火用)特征研究[J]. 中国科技论文在线精品论文,2010,3(18):1842-1846.
 
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