摘要
为实现吹膜挤出机在电磁感应加热条件下能效的定量分析,对吹膜挤出机电磁感应加热的三维有限元模型进行了研究,导出了对应于指定机筒和螺杆材料的电流透入深度与电磁感应加热器的各设计参数之间的关系;分析了挤出机的机筒与螺杆等关键部件在电磁感应三段式分区加热条件下的磁场分布、电流密度场分布及焦耳热能分布的相对趋势。结果表明,感应磁场主要分布在机筒内表面,而相应的感应电流主要分布在机筒外层,且当机筒上缠绕的3组匝数相同的电磁感应加热线圈中加载有大小相等、方向相同的交变电流时,电流密度和产生的焦耳热能集中在机筒和螺杆的中部,而适当增加进料段与计量段加热区所对应的两组线圈匝数可获得较为均匀的电磁感应加热效果。相对于电阻式加热,电磁感应加热的能量损耗较小,是一种环保节能的吹膜挤出机加热方式。
In order to achieve quantitative analysis of energy efficiency of the blown film extruder in electromagnetic induction heating condition, three dimensional finite element model of the extruder in electromagnetic induction heating condition were studied. The relationships between the current penetration depth with specified barrel and screw material and various design parameters of the electromagnetic induction heater were exported, the relative tendency of magnetic field distribution, current density field distribution and Joule heat field distribution of key components in extruder such as extruder barrel and screw in the three section type electromagnetic induction heating condition was analyzed. The simulation data prove that the induced magnetic field is mainly distributed on inner surface of the barrel, the corresponding induced current is mainly distributed on external layer of the barrel, and when the three group wound electromagnetic induction heating coils with the same number of turns at the barrel are loaded with alternating current of equal size and same direction, the current density and the Joule heat energy are concentrated in the intermediate section of barrel and screw. Increasing the number of turns, of the two coils corresponding to the feeding section and metering section properly can obtain more uniform electromagnetic induction heating effect. With respect to the resistor type heating, the electromagnetic induction heating has low energy loss, so it is an environmentally friendly and energy-saving heating method during the blown film extrusion process.
出处
《工程塑料应用》
CAS
CSCD
北大核心
2014年第12期66-70,共5页
Engineering Plastics Application
关键词
电磁感应加热
挤出机
三维有限元模型
电流密度场分布
焦耳热能分布
electromagnetic induction heating
extruder
three-dimensional finite element model
current density field distribution
Joule heat field distribution
