强迫循环冷阱捕集杂质研究

基于冷阱内部传热传质相关理论,建立了强迫循环冷阱捕集杂质模型。建模过程中,提出了适用于回热器内置非等温冷阱传热计算方法,并进行了程序编译。计算结果表明:随着捕集时间的增加,冷阱捕集杂质总质量及捕集效率均增加,但变化的幅度均逐渐减小;Na K合金中的杂质主要沉淀于金属丝网上,金属丝网捕集杂质的质量较3个壁面捕集杂质的总量大得多;金属丝网的网格长度越短、丝径越大,越利于捕集杂质,但网格长度较丝径对捕集时间的影响更大。

Study on Capturing Impurity in Forced Circulation Cold Trap

Based on theories of the heat and mass transfer inside the cold trap, a model to compute impurities captured by forced circulation cold trap was built.In the process of modeling, an algorithm to calculate the heat transfer was developed, applying to the non-isothermal cold trap which has a regenerator inside;meanwhile, a program was compiled.The calculated results show that the total mass captured by the cold trap and the capture efficiency increase with the captured time, but the amplifications gradually decline;impurities in the sodium-potassium alloy mainly precipitate on the wire mesh, and the mass of impurities captured by the wire mesh is much larger than the total mass captured by three walls;the shorter lattice length and the larger diameter of the wire mesh are beneficial to capturing impurities while the lattice length has more effects on the captured time than the diameter of the wire mesh.