小麦粮堆降温冷却过程中温度变化研究  

Study of temperature changes in wheat grain heap during cooling process

作　　者：王若兰[1] 刘胜强[1] 李换[1] 马会霞[1] 

机构地区：[1]河南工业大学粮油食品学院,河南郑州450001

出　　处：《粮食与油脂》2017年第5期23-27,共5页Cereals & Oils

基　　金：国家高技术研究发展计划(863计划)项目(2012AA101705-2)

摘　　要：采用风冷制冷机组对模拟仓进行冷却通风,在粮层中间形成明显的温度梯度后停机,探究制冷时和停机后粮温的变化规律。结果表明:在冷却通风过程中,靠近冷源的底层(7层)温度变化最快,于通风38 h时温度先达到平衡,平均降温速率约为0.04℃/h,5、6层粮温通风50 h后达到平衡。停机3个月,各层温度变化不一致:上层粮温先上升后下降,与仓温和气温的变化趋势一致,上层粮温高于表层中部,而低于仓墙两侧粮温;中、下层粮温以接近抛物线形式缓慢上升,前期速率依次约为0.31、0.179、0.115、0.115℃/d,远低于冷却时的平均降温速率(0.02~0.26℃/h),且制冷前后粮堆平均水分没有明显变化。The cooling ventilation experiment was conducted in a simulative horizontal warehouse by air-cooled refrigeration unit. The machine was stopped when obvious temperature gradient was formed in the middle grain layer. The temperature change of wheat grain heap in and after the cooling process was investigated. The results showed that the bottom layer temperature changed fastest and achieved balance after 38 h of ventilation at a average cooling rate of 0.04℃/h. The 5th and 6th layer achieved temperature balance after 50 h of ventilation. In the following three months storage period, different layers showed different trends. The upper grain layer temperature first rose and then declined, in accordance with the air and warehouse temperature. The temperature of upper part was higher than that of central surface, but lower than that of the wall. While the middle and under layer temperature rose close to the parabola form, the early rate was about 0.31, 0.179, 0.115 and 0.115℃/d, respectively, which was far below to the average cooling rate of 0.02-0.26 ℃/h. The whole process did not make obvious change of water content..

关 键 词：冷却通风 小麦 粮堆 温度变化 

分 类 号：TS210.1[轻工技术与工程—粮食、油脂及植物蛋白工程]