低温苹果汁热泵蒸发系统的设计研究  

Design and study of low temperature apple juice evaporation system by heat pump

作　　者：许荣华 韩东[2] 陈俊杰 XU Ronghua;HAN Dong;CHEN Junjie(Yangzhou Flourish fruit and vegetable juice Machinery Co.,Ltd,Jiangsu,Yangzhou,225105;College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Jiangsu,Nanjing,210016)

机构地区：[1]扬州福尔喜果蔬汁机械有限公司,江苏扬州225105 [2]南京航空航天大学能源与动力学院,江苏南京210016

出　　处：《酒．饮料技术装备》2021年第4期38-45,共8页Brew & Beverage Technology and Equipment

摘　　要：针对苹果汁等物料在蒸发浓缩过程中的热敏性问题,基于热泵原理提出了一种适用于苹果汁蒸发浓缩的热泵系统方案,通过与机械蒸汽再压缩(MVR)低温蒸发浓缩系统对比,研究了该系统的关键设备成本、吨水电耗、综合性能以及热敏性影响规律。结果表明:在苹果汁真空蒸发浓缩过程中,与MVR系统相比,低温热泵蒸发浓缩系统具有更优的技术经济性能;在真空操作条件下,操作温度的提高有利于改善蒸发浓缩系统的技术经济性能。此外,尽管提出的热泵系统较MVR系统的热力学性能略差,但该系统的核心设备——压缩机结构紧凑、成本低廉。针对本文算例——苹果汁溶液蒸发浓缩过程,分析结果表明,当操作温度高于32℃时,MVR系统的综合性能更优;当操作温度低于32℃时,热泵系统具有显著优势。另外,在操作温度为40℃时,实验的最优热力性能为164.55kWh/t。In view of the heat sensitivity of apple juice and other materials in the process of evaporation and concentration,a heat pump system suitable for apple juice evaporation and concentration was proposed based on the principle of heat pump.Compared with mechanical vapor recompression(MVR)low temperature evaporation and concentration system,the key equipment cost,power consumption per ton of water,comprehensive performance and heat sensitivity of the proposed system were studied.The research results showed that:compared with MVR system,low temperature heat pump system had better technical and economic performance in apple juice vacuum evaporation concentration process.Under the conditions of vacuum operation,the increase of operating temperature was beneficial to improve the technical and economic performance of evaporation system.In addition,although the thermodynamic performance of the proposed heat pump system was slightly worse than that of the MVR system,the compressor,the core equipment of the novel system,was compact in structure,low in cost.The results showed that the performance of MVR system was better when the operating temperature was higher than 32°C,but when the operating temperature was lower than 32°C,the proposed system had a significant advantage.Furthermore,the optimal thermal performance obtained experimentally was 164.55kwh/t at 40°C.

关 键 词：低温蒸发 热泵 热敏性 技术经济性能 

分 类 号：TQ021[化学工程]