无受纳水体区域核设施液态流出物转气态排放技术研究

Technical Research on Liquid Effluent Converted to Gas Discharge of Nuclear Facilities in the Area Lacking Receiving Water

液态流出物的排放控制是无受纳水体区域核设施运行过程中的重要问题,为实现内陆核设施液态流出物的近零排放,可将液态流出物转气态并利用大气稀释进行排放。本次研究开展了一体式载带塔对液体进行载带并转为气态排放规律的探索,研究过程中设计了液态流出物转气态排放工艺路线并搭建工程规模液转气实验台架进行工艺运行参数的探究。研究表明,在载带塔内不同的气液两相流体流量、温度以及外环境自然条件对液转气的处理能力有明显的影响,不同运行参数将改变蒸发速率、气液两相有效接触面积、单位气体载带上限及设备载带速率等因素,进而影响设备载带能力。工程台架实验表明,载带塔内多块塔板总面积约为60m^(2)的情况下,能够满足本设备100m^(3)/年的设计需求。

Discharge control of liquid effluent is a crucial concern in the operation of nuclear facilities located in areas without access to receiving water.To achieve the objective of minimizing liquid effluent discharge from inland nuclear facilities,one approach involves converting the liquid effluent into gas and releasing it through atmospheric dilution.This study aims to investigate the emission regulation of an integrated belt-carrying tower for transporting liquid and converting it into a gaseous state.During the study,the process route of liquid effluent to gaseous state was designed and the liquid-to-gas experimental platform of the project was built to explore the process operation parameters.The research shows that different gas or liquid fluid flow,temperature and external natural conditions in the carrier tower have obvious effects on the processing capacity of liquid-to-gas conversion.Different operating parameters will change the evaporation rate,the effective contact area of the gas-liquid two-phase,the upper limit of the unit gas carrier band and the equipment carrier band rate,and then affect the equipment carrier band capacity.The engineering bench test shows that when the total area of multiple trays in the tower is about 60 m^(2),the maximum carrying capacity of liquid effluent is about 50 kg/h,and the annual processing capacity is more than 100 m^(3).