为提升核设施退役去污能力,提出高压二氧化碳载送干冰喷射去污方法.基于Fluent软件建立了喷射去污系统中关于喷嘴与去污箱体内部流场的分析模型,通过流场分析获得了干冰颗粒速度分布.以靶距、喉半径、喷嘴长度、干冰粒径、压力为关键参数,以干冰颗粒对污染表面的冲击应力与分布直径的乘积为去污评价指标,分别开展了 1.5、3 mm 口径喷嘴流场分析的正交试验.通过均值响应分析和主效应分析掌握了各关键参数对去污性能的影响规律,获得最优参数组合.分析结果表明:关键参数优化后,1.5 mm 口径喷嘴去污性能提升了 5.64％,3 mm 口径喷嘴去污性能提升了 15.8％,后者去污性能是前者的1.3倍,但前者的二氧化碳利用率是后者的3倍,具有更好的经济性.该分析结果可为喷嘴选型和喷射去污系统参数计算提供支撑.
Flow Field Analysis and Key Parameters Optimization for the Decontamination of Dry Ice Blasting with High-Pressure Carbon Dioxide Delivery
In order to enhance the decontamination capability of nuclear facilities,a high-pressure carbon dioxide fed dry ice blas-ting decontamination method was proposed.Based on Fluent software,an analytical model of the flow field inside the nozzle and the de-contamination chamber was established for the jet decontamination system,and the velocity distribution of dry ice particles was obtained through the flow field analysis.Using target distance,throat radius,nozzle length,dry ice particle size and pressure as key parameters and the product of impact stress of dry ice particles on the contaminated surface and distribution diameter as decontamination evaluation in-dex,orthogonal tests for flow field analysis of 1.5 mm and 3 mm diameter nozzles were carried out respectively.By means of mean re-sponse analysis and main effect analysis,the influence law of each key parameter on the decontamination performance was grasped,and the optimal combination of parameters was obtained.The analysis results show that:after the key parameters are optimized,the decontam-ination performance of 1.5 mm diameter nozzle is improved by 5.64％,and the decontamination performance of 3 mm diameter nozzle is improved by 15.8％;the latter has 1.3 times more decontamination performance than the former,but the former has 3 times more CO2 utilization than the latter,providing better economy.The results of this analysis can provide support for nozzle selection and jet decon-tamination system parameter calculation.
carbon dioxidespray decontaminationdry ice particlesflow field analysisparameter optimization
万方数据
维普
