径向流氦氢分离床穿透特性实验与模拟分析
Experimental and Simulation Analysis of Breakthrough Capacity of Radial Flow Helium-hydrogen Separation Bed
丁卫东 1占勤 1杨洪广 1连旭东1
作者信息
- 1. 中国原子能科学研究院反应堆工程技术研究所,北京 102413
- 折叠
摘要
为系统深入研究径向流氦氢分离床的吸附穿透性能,指导结构设计,本研究借助COMSOL Multiphysics软件耦合材料吸氢动力学方程、流体流动动量方程和质量传递方程,建立了径向床穿透数学模型,并结合实验验证了模型的可靠性,利用模型对特性参数进行参数化扫描,分析其对穿透性能的影响.结果表明,穿透实验结果与模拟数据符合较好,模型可靠.通过分析温度、高径比及孔隙率等参数对床体穿透性能的影响,推荐氦氢分离床床体参数如下:床体吸附温度为室温～343 K,在该温度范围内升高温度对传质区长度及出口处浓度-时间曲线影响较小;随着高径比的增加,床体效率明显下降,其中高径比为2.00～8.33时,维持高效率的时间较长;随着孔隙率的增加,床体吸附效率明显下降,考虑床层的吸附效率、压阻效应及粉末的装填难度,粉末孔隙率推荐0.56～0.64.以上结果表明,本研究建立的模型可较好地预测床体的吸附分离性能,可用于床体结构设计以及工艺参数的优化.
Abstract
Helium-hydrogen separation bed is an important part of tritium extraction system.In order to deeply study penetration performance of the radial flow bed and guide the structure design,the mathematical model of radial bed breakthrough capacity was established by coupling material hydrogen absorption kinetics equation,mass trans-fer equation and fluid flow momentum equation in COMSOL Multiphysics,which was used to carry out parametric scanning of the characteristic parameters,and the effect of the model on the breakthrough capacity was analyzed.The results show that the break-through experiment results are in good agreement with the simulated data,and the model is reliable.The effect of temperature,height-diameter ratio and porosity on the breakthrough capacity was analyzed.The adsorption temperature of the bed is from room temperature to 343 K.In this temperature range,increasing the temperature has less effect on the length of the mass transfer zone and the concentration-time curve at the outlet.With the increase of the height-diameter ratio,the efficiency of the bed decreases significantly,in which the high efficiency is maintained for a longer period of time when the hieght-diameter ratio is 2.00-8.33.With the increase of porosity,the adsorption efficiency of the bed decreases significantly.Considering the adsorption efficiency,the flow resistance and the difficulty of powder loading,the powder porosity is recommended from 0.56 to 0.64.Therefore,the model established in this study can better predict the adsorption performance,and can be used to optimize the structure design basis and process parameters.
关键词
径向流/氦氢分离床/穿透特性/数值模拟Key words
radial flow/helium-hydrogen separation bed/breakthrough capacity/numerical simulation引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据