聚乙烯紫外光交联辐照源的特性及微波光源优化的研究

发布时间：2018-07-23 12:21

【摘要】：在交联聚乙烯生产过程中,紫外光交联具有生产速度快、连续生产时间长和生产原料成本低等优点。因此紫外光交联得到了广泛的关注,其中,交联用的光源称为研究的重中之重。目前,在紫外交联聚乙烯生产技术上,广泛使用的光源有中压汞灯和微波无极汞灯。其中中压汞灯光谱能量集中,但是使用寿命短;而微波汞灯的使用寿命长,却发热严重,可能导致能量的浪费。现在新型的一种紫外光源为紫外反光二极管,这种光源光谱能量集中,可根据需要设计光源的排列方式,使用方便。本论文对中压汞灯、微波汞灯和新兴的LED进行了理论分析,研究了这三种典型紫外光源的发光机理等等。依靠微波能量激励发光的无极汞灯,具有紫外辐射效率高、寿命长和热辐射功率低等优点,能够避免目前光交联系统中所使用的变压器驱动的中压汞灯辐照系统造成的材料交联不均匀和局部过热等问题,因此本文研究了微波紫外光源装置中波导的尺寸对输入反射系数的影响,通过仿真过程中改变波导的尺寸,得到在特定的规格下,满足输入端对反射系数的要求,并且通过比较波导表面电流的大小,最后确定了波导的尺寸。谐振腔上屏蔽网到谐振腔截面椭圆中心的距离对谐振腔能否实现对2.45GHz的微波的谐振有很大影响,本文通过仿真确定了这个距离,实现了微波2.45GHz的谐振。波导和谐振腔之间的开口,即耦合孔的位置对谐振腔内电场的大小有很大的影响,本文通过改变波导边缘到谐振腔边缘的距离使得谐振腔内的电场最大,实现了电场值的提高。根据谐振腔上耦合孔的尺寸对频率为2.45GHz的微波馈入深度的影响,设计出了最优尺寸的方形耦合孔。
[Abstract]:In the process of crosslinked polyethylene production, UV crosslinking has the advantages of fast production speed, long continuous production time and low raw material cost. Therefore, ultraviolet crosslinking has been paid much attention, among which, the light source used for crosslinking is the most important research. At present, in the production technology of UV crosslinked polyethylene, the widely used light sources are medium pressure mercury lamp and microwave non-polar mercury lamp. The spectrum energy of pressure mercury lamp is concentrated, but the service life is short, while the microwave mercury lamp has a long service life, but the heat is serious, which may lead to the waste of energy. A new type of ultraviolet light source is ultraviolet reflecting diode, which can design the arrangement of light source according to the need and is convenient to use. In this paper, the medium pressure mercury lamp, microwave mercury lamp and new LED are theoretically analyzed, and the luminescence mechanism of these three typical UV light sources are studied. The electrodeless mercury lamp, which is excited by microwave energy, has the advantages of high ultraviolet radiation efficiency, long life and low thermal radiation power, etc. It can avoid the problems of uneven crosslinking and local overheating caused by the medium pressure mercury lamp irradiating system driven by transformer in the current photocrosslinking system. In this paper, the influence of waveguide size on the input reflectance is studied. By changing the waveguide size in the simulation process, it is obtained that the reflection coefficient of the input end can be satisfied under specific specifications. Finally, the size of the waveguide is determined by comparing the surface current of the waveguide. The distance between the shielding network on the cavity and the elliptic center of the cavity section has a great influence on whether the resonator can realize the microwave resonance of 2.45GHz. This distance is determined by simulation in this paper, and the resonance of microwave 2.45GHz is realized. The opening between the waveguide and the resonator, that is, the position of the coupling hole, has a great influence on the electric field in the resonator. By changing the distance from the waveguide edge to the resonator edge, the electric field in the resonator is maximized and the electric field value is increased. According to the influence of the size of the coupling hole on the microwave feed depth of frequency 2.45GHz, the square coupling hole with the optimal size is designed.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O632.12

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