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首页> 外文期刊>International journal of nuclear desalination >Innovation in radioactive wastewater-stream management. Part II: theoretical model and experimental verification
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Innovation in radioactive wastewater-stream management. Part II: theoretical model and experimental verification

机译：放射性废水管理创新。第二部分：理论模型与实验验证

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摘要

The present work is the second part of the authors' innovative method for radioactive wastewater-stream management, by volume reduction, by a mutual heating and humidification of a compressed dry air introduced through the wastewater. In this part, to determine the optimal operating conditions, a theoretical model describing volume reduction of the radioactive wastewater stream is achieved. A set of first-order simultaneous differential equations describing the bubble humidity, temperature, liquid temperature, and mass diffusion to the bubbles variations, are obtained through the mass and energy conservations. A set of coupled first-order differential equations are used to solve for the humidity ratio, water diffused to the air stream, water temperature and humid air stream temperature distributions through the bubbling column. These coupled differential equations are simultaneously solved numerically by a developed computer program using the fourth-order Runge-Kutta method. Therefore, the behaviour of the air bubble state variables with column height can be predicted and optimised. Moreover, the design curves of the volumetric reduction of the wastewater streams are obtained and assessed at the different operating conditions. An experimental set-up was constructed to verify the suggested model. Comprehensive comparison between suggested model results, recent experimental measurements and the results of previous works was carried out and assessed. A good agreement between experimental and theoretical model is obtained. A semi-empirical correlation is obtained together with design curve of bubbling column.
机译：目前的工作是作者创新方法的第二部分，该方法通过减少体积，通过相互加热和加湿通过废水引入的压缩干燥空气来减少放射性废水流。在这一部分中，为了确定最佳操作条件，获得了描述放射性废水流体积减少的理论模型。通过质量守恒和能量守恒，获得了一组描述气泡湿度，温度，液体温度和质量扩散到气泡变化的一阶同时微分方程。使用一组耦合的一阶微分方程来求解湿度比，扩散到气流中的水，通过鼓泡塔的水温和湿空气流的温度分布。这些耦合的微分方程是由开发的计算机程序使用四阶Runge-Kutta方法同时进行数值求解的。因此，可以预测和优化气泡状态变量随柱高的变化。此外，在不同的操作条件下获得并评估了废水流体积减少的设计曲线。建立了一个实验装置以验证建议的模型。对建议的模型结果，最近的实验测量结果和以前的工作结果进行了全面比较，并进行了评估。实验模型和理论模型之间取得了良好的一致性。获得了半经验相关性以及鼓泡塔的设计曲线。

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