仔猪配合料比热预测模型的构建

发布时间：2018-05-26 06:44

本文选题：比热 + 温度　；参考：《农业工程学报》2016年18期

【摘要】：为探究调质、制粒等热处理过程中仔猪配合粉料传热的基本特性,有效控制热量供给并实现调质温度、时间等工艺参数的优化评估,该文以4种粉碎粒度(粉碎筛片孔径:Φ1.0、Φ1.5、Φ2.0和Φ2.5 mm)的仔猪配合粉料为研究对象,采用DSC(differential scanning calorimetry,差示扫描量热法)的方法测定了其在不同含水率范围(10%~18%,湿基)和不同温度范围(25~100℃)的比热,并分析了3个变量对比热的影响规律,构建了比热关于研究变量的预测模型。结果显示:仔猪配合粉料的比热受含水率、温度、粉碎粒度的显著影响,其中含水率的影响最为显著,温度及粉碎粒度次之;比热亦受含水率与粉碎粒度及其与温度的交互作用影响。比热随含水率和温度的增加在1.533~2.881 k J/(kg·K)范围内升高,且与含水率呈线性关系,与温度呈非线性关系。粉碎过Φ2.5和Φ2.0 mm的仔猪料比热较粉碎过Φ1.5和Φ1.0 mm的大,在高温(60~100℃)和高含水率(18%)时表现尤为明显。基于试验数据建立了比热关于含水率、温度、粉碎粒度的多元回归模型(R~20.993),可以有效预测仔猪配合料在此研究变量范围内的比热。研究结果为仔猪配合料调质过程传热方程的建立提供基础数据,并为其热处理工艺参数的优化提供理论依据。
[Abstract]:In order to explore the basic characteristics of heat transfer of piglets combined with powder in the process of heat treatment and granulation, to effectively control the heat supply and to realize the optimization evaluation of the tempering temperature, time and other technological parameters, this paper uses 4 kinds of comminuted granularity (pulverized sieves diameter: 1, 1.5, 1.5, 2 and 2.5 mm) as the research object, and uses DSC (differential) Scanning calorimetry, differential scanning calorimetry (differential scanning calorimetry) method was used to determine the specific heat in the range of water content (10%~18%, wet base) and different temperature range (25~100 C), and the influence of 3 variables on the specific heat was analyzed. The prediction model of the specific heat on the research variable was constructed. The results showed that the specific heat of the piglets was affected by the water content and temperature. The effect of water content is the most significant, the temperature and the particle size are the most significant, and the specific heat is influenced by the interaction of water content and grinding grain and its temperature. The specific heat increases with the increase of water content and temperature in the range of 1.533~2.881 K J/ (kg. K), and has a linear relationship with the water content, and the temperature is non line with the temperature. Sex relations. The piglets that have crushed the diameter of 2.5 and 2 mm have larger than the heat of 1.5 and 1 mm, especially at high temperature (60~100) and high water content (18%). Based on the experimental data, a multiple regression model (R~20.993) of specific heat on water content, temperature and particle size can be established, which can effectively predict the change of piglet complex in this study. The results of the study provide the basic data for the establishment of heat transfer equation for piglet mixing process, and provide a theoretical basis for the optimization of the heat treatment process parameters.
【作者单位】：中国农业大学工学院国家农产品加工技术装备研发中心;
【基金】：公益性行业(农业)科研专项(201203015)
【分类号】：S828.5

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