仔猪配合料比热预测模型的构建

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...

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Published in农业工程学报 Vol. 32; no. 18; pp. 307 - 314
Main Author 孔丹丹 陈啸 杨洁 张国栋 彭飞 王红英
Format Journal Article
LanguageChinese
Published 中国农业大学工学院,国家农产品加工技术装备研发中心,北京 100083 2016
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Summary: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^2〉0.993),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。
Bibliography:11-2047/S
specific heat; temperature; models; mash feed; moisture content; grinding particle size
Weaned piglet's pellet feeds are designed for healthy growth of weaned piglet. Conditioning is a key factor affecting pellet feed quality and pellet mill throughput, which can be defined as the process of transforming the physical state of the mixed mash with the addition of saturated steam to facilitate the compaction of the feed mash. Knowledge of the thermal properties of mash feed is required to perform the heat transfer calculations that are involved in the optimal design of conditioner and evaluation of operating parameters. Specific heat is an important thermodynamic parameter used in heat transfer and energy balance calculations. Conditioning processing involves broad temperature(25-95 ℃) and moisture content(12%-16.5%, wet base) ranges. The objectives of this investigation were to determine the specific heat of mash feeds for weaned piglet as affected by moisture content, temperature and grinding particle
ISSN:1002-6819
DOI:10.11975/j.issn.1002-6819.2016.18.042