脉冲电压作用下液体食品击穿特性研究  

Study on the breakdown characteristics of liquid food under pulsed electric voltage

作　　者：魏新劳[1] 李军辉[1] 王浩然[1] 朱博[1] 

机构地区：[1]哈尔滨理工大学电气与电子工程学院,哈尔滨150080

出　　处：《中国科技论文》2017年第11期1262-1268,共7页China Sciencepaper

基　　金：国家自然科学基金资助项目(51277046);高等学校博士学科点专项科研基金资助项目(20122303110007)

摘　　要：液体食品异常击穿是脉冲电场灭菌技术中的技术瓶颈之一。深入研究液体食品在脉冲电压作用下的击穿特性、探究其击穿机理,对于有效解决这一技术瓶颈至关重要。在搭建的研究脉冲电压作用下液体食品击穿特性的专用实验平台,对自来水、橙汁和啤酒这3种常见的液体食品在脉冲电压作用下的击穿特性进行了实验研究,分别研究了液体食品的压力、流速、温度对其脉冲电压作用下击穿电压的影响。研究结果表明:在脉冲电压作用下,这3种液体食品的击穿电压均随液体压力的增高而提高、随液体流速的增大而提高、随着液体温度的升高而提高。在压力、流速和温度这3个影响因素中,压力对脉冲电压作用下液体食品击穿电压的影响最突出,其次是流速的影响,最后是温度的影响。因此,消除或抑制液体食品在脉冲电场灭菌中的异常击穿主要应该从压力和流速两个方面去考虑采取相应的技术措施。Liquid food abnormal breakdown is a technological bottleneck of pulsed electric field sterilization technique.A in-depth study on the breakdown characteristics of liquid food under the action of the pulse voltage and exploring the breakdown mechanism are very important to effectively solve the technological bottleneck.A experimental platform for the study on the breakdown characteristics was built and the breakdown characteristics of water,orange juice and beer were studied in this experiment platform.The effects of the pressure,flow velocity and temperature to the breakdown voltage were studied respectively.The results show that,under the action of the pulse voltage,three kinds of liquid food＇s breakdown voltage increase with the liquid＇s pressure increased,increase with the liquid＇s flow velocity increased and increase with the liquid＇s temperature increased.In the three influence factors,the pressure has the most prominent effect on breakdown voltage of liquid food,followed by the flow velocity,and the last is the temperature,Therefore,in order to eliminate or suppress abnormal breakdown of liquid food in the pulsed electric field sterilization,liquid food＇s pressure and flow velocity should mainly be considered.

关 键 词：脉冲功率技术 脉冲电场灭菌 液体食品 异常击穿 击穿特性 

分 类 号：TS205[轻工技术与工程—食品科学]