不同前处理对饲料玉米比热的影响  

Effects of different pretreatments on specific heat of forage maize

作　　者：王红英[1] 李倪薇[1] 高蕊[1] 杨洁[1] 康宏彬[1] 

机构地区：[1]中国农业大学工学院,北京100083

出　　处：《农业工程学报》2012年第14期269-276,共8页Transactions of the Chinese Society of Agricultural Engineering

基　　金："十二五"国家科技计划课题(2011BAD26B0401)

摘　　要：为了明确以玉米为原料的配方饲料在调质、膨化、冷却过程中传热传质的基本特性,该文利用差示量热扫描仪(differential scanning calorimeter,DSC)测比热的方法,研究了自然干燥条件下,不同的烘干温度(45～105℃)、含水率(12%～16%,湿基计)、粉碎粒度(0.2～0.6mm)等前处理因素对玉米比热的影响。采用3因素5水平2次正交旋转设计,通过回归分析和响应面分析,建立了玉米比热基于烘干温度、含水率(湿基计)、粉碎粒度的数学模型。研究结果表明:所得回归方程拟合情况良好,当烘干温度为45℃、含水率为12%(湿基计)、粉碎粒度为0.6mm时,玉米的比热值最小为2051J/(kg·K)。此模型的建立可为不同处理条件下玉米比热值的直接获得提供理论方法与依据,为不同配方饲料的湿热加工特性研究提供参考。In order to determine the heat and mass transfer properties of corn-based feedstuffs during the process of conditioning,extrusion and cooling,the effects of drying temperature（45-105 ℃）,moisture content（12%-16%） wet basis,particle size（0.2-0.6 mm） on the specific heat of corn grain were investigated using a continuous differential scanning calorimeter（DSC） method.The experiments in three factors with five levels were designed by quadratic orthogonal rotation approach.A model of specific heat of corn grain versus dry temperature,moisture content and particle size was established by regression analysis and response surface methodology（RSM）.The results showed that the minimum specific heat of corn grain was obtained（2051 J/（kg.K）） under the processing condition of drying temperature 45 ℃,moisture content 12% wet basis,and particle size 0.6 mm.This model can be used to evaluate the specific heat of corn grain processing in different conditions and to provide a reference for thermal processing of similar feedstuffs.

关 键 词：比热 烘干 含水率 前处理 玉米 饲料加工 

分 类 号：S816.9[农业科学—饲料科学]