5H-2谷物烘干机干燥箱多孔角状盒的设计与试验
Design and experiment of multi-hole horn box in oven of 5H-2 grain dryer
张利峰 1廖骞 2刘大为 2谢方平 2王修善 2李铁辉3
作者信息
- 1. 湖南省农机事务中心,湖南 长沙 410035
- 2. 湖南农业大学机电工程学院,湖南 长沙 410128
- 3. 湖南农友机械集团有限公司,湖南 娄底 417700
- 折叠
摘要
为改善 5H-2 谷物烘干机的干燥性能,将原有角状盒改造为多孔角状盒.通过Fluent对多孔角状盒的干燥段气流场进行仿真分析,对比空载条件下干燥箱内部温度场变化情况,结果表明,装有多孔角状盒的干燥箱内部温度场较原有角状盒的分布更趋均匀.选择早稻'中早 35'稻谷,在 5H-2谷物烘干机上安装多孔角状盒开展烘干试验,设置热风干燥温度为 65℃,风速为 8 m/s,干燥缓苏比为 1∶2,结果装有多孔角状盒的烘干机干燥速率为 0.798%/h～1.002%/h,烘干后爆腰增率为 7.4%～10.2%,相比原有角状盒谷物烘干机,其干燥速率提高了 12.1%～21.2%,爆腰增率降低了 1.9%～5.1%.
Abstract
In order to improve the drying performance of the 5H-2 grain dryer,an innovative modification was introduced by transforming the conventional angular boxes into porous angular boxes.Computational fluid dynamics(CFD)simulations using Fluent were employed to analyze the airflow field within the drying segment of these newly designed porous structures.A comparison of the temperature distribution within the drying chamber under unloaded conditions revealed a notably more uniform temperature field with the implementation of the porous angular boxes compared to their non-porous predecessors.Experimental drying trials were subsequently conducted on early-season rice variety'Zhongzao 35'using the 5H-2 grain dryer equipped with these porous angular boxes.The tests were configured with a hot air drying temperature of 65 ℃,an air velocity of 8 m/s,and a drying-relaxation ratio of 1:2.The resultant drying rates ranged from 0.798％/h to 1.002％/h,with an increase in kernel cracking rate of 7.4％to 10.2％post-drying.In comparison to the original angular box design,the dryer equipped with porous boxes demonstrated a significant enhancement in drying efficiency,with rates elevated by 12.1％to 21.2％,while concurrently reducing the increase in kernel cracking rate by 1.9％to 5.1％.These findings underscore the efficacy of the porous angular box design in optimizing the drying process,thereby reducing grain damage and enhancing overall drying performance.
关键词
谷物烘干机/干燥箱/角状盒/干燥速率/爆腰增率Key words
grain dryer/drying box/angular box/drying rate/crackle ratio increment引用本文复制引用
基金项目
湖南省农业农村厅项目(湘财农指[2021]47号)
出版年
2024
国家科技期刊平台
NSTL
万方数据