食品工程原理课程设计

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1、“食品工程原理”课程设计管壳式冷凝器设计12目录（一）设计任务书·····································································································3（二）设计方案的确定······························································································3（三）冷凝器的选型计算·····································

2、·····················································4（四）核算安全系数··································································································6（五）列管式换热器零部件的设计········································································8（六）设计概要表·····························

3、·····································································1012（七）主体设备结构图···························································································10（八）设计评价与讨论··························································································11（九）参考文献··

4、······································································································11（一）食品科学与工程设计任务书一、设计题目：列管式冷却器设计二、设计任务：将制冷压缩机压缩后制冷剂(如F-22、氨等)过热蒸汽冷却、冷凝为过冷液体，送去冷库蒸发器使用。12三、设计条件：1、冷库冷负荷Q0=3000KW；2、高温库，工作温度0～4℃，采用回热循环；3、冷凝器用河水为冷却剂，可取进水温度为13~26℃；4、传热面积安全系数5～15%。四、设计要求：1

5、.对确定的设计方案进行简要论述；2.物料衡算、热量衡算；3.确定列管壳式冷却器的主要结构尺寸；4.计算阻力；5.编写设计说明书（包括：①.封面；②.目录；③.设计题目；④.流程示意图；⑤.流程及方案的说明和论证；⑥设计计算及说明；⑦主体设备结构图；⑧设计结果概要表；⑨对设计的评价及问题讨论；⑩参考文献。）6.绘制工艺流程图、管壳式冷凝器的的结构（3号图纸）、花板布置图（3号或4号图纸）。备注：参考文献格式：期刊格式为：作者姓名.出版年.论文题目.刊物名称.卷号（期号）：起止页码。专著格式为：作者姓名.出版年.专著书名.出版社名.起止页码。（二）设计方案的确定设计方案的

6、确定包括制冷剂的选择、冷凝器型式的选择、流体流入冷凝器空间的选择、冷却剂的选择及其进出口温度的确定等。一、冷凝器造型与冷凝剂的选择选择卧式壳管式冷凝器（管束采用光滑钢管）、R717(氨气)做冷凝剂，原因有：1.卧式壳管式结构紧凑、传热效果好、冷却水进出口温差大，耗水量小。2.氨气较氟利昂环保，其卧式壳管冷凝器的传热性能也比氟利昂高。以氨作为制冷剂，能制取0℃以下的低温；维修简单、操作方便、易于管理；氨价格低廉，来源充足；对大气臭氧层无破坏作用；钢材及冷却水消耗量大；热力系数较低。二、流体流入空间选择由于冷却剂为河水，根据不洁净或易结垢的物料应当流经易清洗的一侧，饱和蒸

7、汽一般应通入壳程，以便排出冷凝液，被冷却物料一般走壳程，便于散热和减少冷却剂用量，所以确定冷却水走管程，冷凝剂（氨）走壳程。三、流速选择根据后面的各种计算因素互相制约，最终确定：12管内冷却水流速ui=1.412m/s；管外冷凝剂（氨）流速uo=0.35m/s。1.流速增大可以提高膜传热系数，总传热提高，减少需要的传热面积，从而降低机器成本，尽可能使得Re>104；同时减少结垢，从而减少结垢热阻，减少清洁量；2.流速过大，会增大流体阻力，消耗能量，常用流速范围0.5～3m/s。一、冷却剂适宜出口温度的确定任务书要求进水温度为13~26℃，选择进口温度