超临界水氧化处理核电厂去油污溶剂及反应动力学分析

Treatment and Reaction Kinetic Analysis of Waste Solvent From Nuclear Power Plants by Supercritical Water Oxidation

摘要: 采用超临界水氧化技术对核电厂去油污溶剂进行处理，控制不同的过氧系数、停留时间、反应温度和反应压力等实验条件，研究各参数对产水的化学需氧量（COD）及化学需氧量去除率的影响。结果表明：装置的最佳处理条件为过氧系数1.2、停留时间45 s、反应温度450 ℃、反应压力22.5 MPa，有机废液的COD去除率可达到99.8%以上。对核电厂有机废液的超临界水氧化反应动力学规律进行了研究，在22.5 MPa下，反应活化能E_a=(24.64±1.25) kJ/mol，频率因子k₀=2.38 s^-1，动力学模型计算值和实验值的误差在±7%以内。

Abstract: Supercritical water oxidation(SCWO) is applied to treat waste solvent from nuclear power plants. The effects of peroxide coefficient, reaction time, temperature and pressure on the treatment of waste solvent from nuclear power plants are investigated. The result shows the equipment has the best treatment effect under the conditions of peroxide coefficient 1.2, reaction time 45 s, temperature 450 ℃, pressure 22.5 MPa, and the COD degradation rate is up to 99.8%. The kinetic laws of supercritical water oxidation reaction of waste solvent from nuclear power plants are discussed. At 22.5 MPa, the value of activation energy is （24.64±1.25） kJ/mol, the frequency factor is 2.38 s^-1. The deviation between calculation and experimental values is within ±7%.