树脂超临界水氧化反应器设计及数值模拟

超临界水氧化技术是处理废树脂的途径之一,能够快速、有效处理核电站产生的含放射性核素的废离子交换树脂。本文提出了一种新型的超临界水氧化反应器,并采用计算流体动力学方法,建立了以多孔介质模型为基础的树脂颗粒非均相反应与均相反应耦合的反应器模型,对其中的流动、换热及化学反应过程进行了数值模拟研究。结果表明,各工况下有机物均完全转化为二氧化碳,各工况均能满足生产要求;随加热功率增加,反应物料出口温度、流域最高温度、压降与出口速度均逐渐增加。

Design and numerical simulation of a supercritical water oxidation reactor for spent resins

Supercritical water oxidation offers a viable treatment for ion exchange resins. A novel reactor coupled with heterogeneous chemical reaction and homogeneous chemical reaction is proposed, and a numerical model of this reactor based on porous media model has been established by a computational fluid dynamics method. The flow, heat transfer and chemical reaction processes in the reactor have also been investigated. Results show that organic materials are completely degraded under all working conditions and the production requirements have all been met. The outlet temperature, the maximum temperature of the fluid zone, pressure drop and outlet velocity would gradually increase with the increase of heating power.