钢带连续式冻结装置制冷系统的设计_本科毕业设计说明书.doc

摘 要 随着科技的不断进步，人们生活水平的显著提高，食品结构向多样、方便、营养型方向发展。其中，冷冻食品由于其卫生、快捷等特点，越来越受到世界各国人民的青睐。 速冻行业在我国起步较晚，进入九十年代，国内速冻食品迅猛发展，与此相应国产速冻装置也从无到有并不断推陈出新。本课题将以速冻汤圆为例，进行钢带连续式冻结装置制冷系统的设计。首先，对国内外的发展历史及现状作了简单的介绍，并对速冻食品的未来作了展望。随着人们对速冻食品的需求越来越高，使速冻装置的应用市场越来越大。在文中也介绍了速冻食品的原理。毫无疑问，速冻装置对速冻食品的质量起着至关重要的作用。其中钢带连续式速冻机因其冻结工艺简单、适用范围广越来越受到青睐。文中的最后，揭示了该冻结装置存在的问题，并提出了提高其效率的有效途径。 关键词：速冻；食品；冷负荷 Abstract With the development of technology and the improvement of people’s living standards. The foodstuff structure is changing towards multiplicity convenience and nutrition. The quick-freezing food is becoming more popular among the worldwide because its healthy，fast and many other advantages. Frozen industry in China starts late, while the development of the domestic frozen food is rapid from the last century. At the same time, the freezing equipment is also scratch. Freezing-preservation is the best method for food preservation. It is cheaper and can preserve the food longer. A topic investigated processing procedures for fast frozen dumpling. First, I introduce the history and the present of the quick-freezing industry. Also, some future I imagine. The principle and characteristic of quick-freezing food technologic is introduced in the paper. There is no doubt that quick梖reezing equipment is crucial for the good qualities of frozen food. The steel belt quick freezer is favorable for its simple freezing technology and wide application. At finally, some measurements are given to improve quick freezer performance after revealing their existing problems. Key words：quick-freezing; sweet soup balls；cooling load 目 录 绪 论 1 第一章 速冻食品及装置 1 1.1 速冻技术产生的背景 1 1.2 速冻及发展现状 2 1.2.1冻结装置 2 1.2.2速冻食品 2 1.3 速冻行业的未来发展趋势 3 1.4 本课题的主要研究内容 4 第二章 食品冷冻原理与相关参数的计算 5 2.1 食品冷冻保鲜原理 5 2.2 食品冷冻曲线 6 2.3 速冻汤圆原料及物性参数计算 7 2.3.1 原料以及食品物性值计算 7 2.3.2 设计条件以及相关物性参数计算 7 2.4 食品的冻结特性 8 2.5 热负荷计算 9 2.5.1食品冷负荷 9 2.5.2其他冷负荷 10 2.6 冻结速率与时间 10 2.6.1食品的冻结速率 10 2.6.2 食品的冻结时间 10 第三章 主要制冷设备的选型与计算 12 3.1 制冷系统方案设计 12 3.2 制冷压缩机的选型计算 13 3.2.1 制冷