中低放废液一体化自然循环蒸发器设计

Design of Integrated Natural Cycle Evaporator for Low and Medial Level Radioactive Liquid Waste

根据中低放射性废液蒸发处理工艺要求,设计一体化的放射性废水蒸发处理装置。该装置采用中央循环管式自然循环蒸发、重力分离、泡罩塔清洗和丝网除沫之类的多重工序,并集成在同一压力容器内,实现设备的一体化布置,可解决清洗液的回流问题,减少设备占地空间,简化系统和操作。通过多效净化方式,使二次蒸汽的雾沫夹带和挥发性放射性含盐量显著降低。设计的一体化自然循环蒸发器能提高废液的净化能力,提高了去污因子,符合废物最小化原则。

The paper mainly introduces a new natural cycle evaporator with central downcomer, which is used to process the low and medial level radioactive wastewater in the reactor operation. The designed evaporator is integrated with the process of evaporated concentration, cleaning demister, and entrainment eliminator. All the assemblies are set in a single pressure vessel. Through the integrated collocation, the cleaning water form demister is reasonably treated, the equipment required less space, the whole evaporated system is simplified and can be handled easily. Through the multi-effect purification, the quantity of entrained mist and volatile product in the produced steam significantly reduced. The proposed evaporator can improve the purification and the decontamination factor of radioactive wastewater, which is accorded with the radioactive waste minimization principle.