摘要
介绍了钢结构千吨囤的建设情况和降温通风工艺应用情况,通过检测千吨囤风机压力和表观风速等通风参数,对千吨囤的通风降温效果及效能进行评价。千吨囤的通风方式为竖向上行压入式通风,采用数字风压和风速测定仪对千吨囤进行竖向通风参数测试研究。结果显示:千吨囤玉米粮堆竖向通风的表观风速和单位通风量增加,粮堆的单位粮层阻力也增加,两者呈正相关;通风阻力中设施阻力占比较大,中心主风道与出粮通道共用管道设计,便于出粮作业,但增加了通风设施阻力,导致通风能耗增加,且受风道设计影响,囤体东北角区域粮面表观风速较低,局部通风效果不佳,建议优化风道设计,可将主通风道与支风道呈放射状均匀布置。千吨囤通风后,粮堆整体温度降低11.3℃,每层平均温度降至-6℃左右,除局部位置温度下降不明显,其余通风降温效果良好。
The construction and the application of cooling and ventilation technology of steel structure silo was introduced. The effect and efficiency of ventilation and cooling of the silo was evaluated by detecting the ventilation parameters such as the fan pressure and superficial gas velocity of the silo. The ventilation mode of the silo was vertical upward press-in ventilation,and the vertical ventilation parameters were measured by digital air pressure and speed meter. The results showed that the unit grain resistance of grain heap increased with the increase of the superficial gas velocity and unit ventilation volume,with positive correlation; in the ventilation resistance,the resistance of the facilities accounted for a larger rate. The central main air duct and the grain delivery channel are designed to share the same pipeline,which was convenient for discharge,but increased the resistance of ventilation facilities and energy consumption. Influenced by the air duct design,the superficial gas velocity of the grain surface in the northeast corner of the silo was low with poor ventilation effect. It is suggested that the main air duct and the branch duct should be arranged radially in the radial direction. After ventilation,the overall temperature of grain heap decreased by 11. 3 degrees,and the average temperature of each layer decreased to about-6 centigrade. The effect of aeration-cooling on the grain heap was good except a little part without obvious decrease of the temperature.
作者
欧阳毅
唐芳
祁智慧
纪晓军
李春元
OU YANG - Yi;TANG Fang;QI Zhi - hui;JI Xiao - jun;LI Chun - yuan(Academy of State Administration of Grain, Beijing 100037;Tongliao Dongjiao Grain Depot of State Administration of Grain Reserve, Tongliao Neimenggu 028012)
出处
《粮油食品科技》
2018年第3期75-79,共5页
Science and Technology of Cereals,Oils and Foods
基金
国家重点研发计划(2016YFD0401003-2)
关键词
千吨囤
绞龙
通风
表观风速
粮堆阻力
silo
screw convey
ventilation
superficial gas velocity
grain resistance