放射性气载流出物取样代表性分析

辐射防护 ›› 2019, Vol. 39 ›› Issue (5): 372-378.

放射性气载流出物取样代表性分析

杨川¹,何泽银¹,张坤²,殷时蓉¹,孙世政¹

1.重庆交通大学机电与车辆工程学院,重庆 400074;
2.61489部队,河南洛阳 471023

出版日期:2019-09-15 发布日期:2019-10-14
通讯作者: 何泽银。E-mail:zeyin_he@126.com
作者简介:杨川(1995—),男,2017年本科毕业于河北工程大学机械设计制作及其自动化专业,现就读于重庆交通大学机电与车辆工程学院。E-mail:yangcqjtu@qq.com
基金资助:
河南省科技创新杰出人才基金项目(NO.154200510029);中国博士后科学基金面上项目(2018M633626XB);重庆市科委基础科学与前沿技术研究项目(CSTC2017jcyjAX0053);重庆市博士后研究人员科研项目特别资助项目(Xm2017191);河南省“放射性污染消除材料与装备技术工程实验室”资助。

Analysis of sampling representativeness of radioactive airborne effluents

YANG Chuan¹, HE Zeyin¹, ZHANG Kun², YIN Shirong¹, SUN Shizheng¹

1.School of Mechanotronics & Vehicle Engineering, Chongqing Jiaotong University, Chongqing 400074; 2.61489 Forces, Henan Luoyang 471023

Online:2019-09-15 Published:2019-10-14

摘要/Abstract

摘要： 为获取核设施放射性气载流出物单点连续监测取样位置,提出基于随机轨道模型(DRW)的气-固多相湍流耦合方法求解代表性取样区域。借助k-epsilon湍流模型模拟连续相,并引入离散颗粒模型(DPM)模拟离散相,建立基于DRW模型的排风管道内流道气-固多相湍流耦合计算模型,计算了核设施气载流出物在管道内流道流场分布规律,分析了内流道流体气旋角、气流速度、示踪气体浓度、气溶胶粒子浓度与管道高度间的关联关系。分析结果表明,随着截面高度的增加,气旋角、气流速度变异系数(COV)、示踪气体浓度COV及示踪气体浓度最大值与平均值的偏差逐渐降低并趋于稳定,气溶胶粒子浓度COV在截面6与截面8满足取样代表性要求;基于计算流体动力学方法可快速地确定出代表性取样位置,为气载流出物单点取样现场试验提供了理论参考依据。

关键词: 核设施, 气载流出物, 单点取样, 取样代表性, 计算流体动力学

Abstract: In order to obtain a single point continuous monitoring and sampling location of radioactive airborne effluents of nuclear facilities, a gas-solid multiphase turbulent coupling method based on the Discrete Random Walk model is proposed to solve the representative sampling location. The continuous phase is simulated with the k-epsilon turbulent model. Discrete particle model was introduced to simulate the discrete phase. A gas-solid multiphase turbulent coupling calculation method in the stack based on the DRW model is established. Flow field distribution of airborne effluents in the stack is calculated. The relationships between the cyclone Angle, air velocity, tracer gas concentration, aerosol particle concentration and pipe height are analyzed. Analysis results indicated that cyclone angle, COV of air velocity, COV of tracer gas concentration, deviation between the maximum and average tracer gas concentration gradually declined and stabilized. The COV of aerosol particle concentration met the requirements at cross section 6 and 8. The representative sampling location can be determined quickly based on computational fluid dynamics. It provides a theoretical reference for field test of single point sampling of airborne effluents.

Key words: nuclear facilities, airborne effluents, single point sampling, sampling representativeness, computational fluid dynamics

中图分类号:

TL75

杨川,何泽银,张坤,殷时蓉,孙世政. 放射性气载流出物取样代表性分析[J]. 辐射防护, 2019, 39(5): 372-378.

YANG Chuan, HE Zeyin, ZHANG Kun, YIN Shirong, SUN Shizheng. Analysis of sampling representativeness of radioactive airborne effluents[J]. RADIATION PROTECTION, 2019, 39(5): 372-378.

参考文献 16

[1]	侯杰, 李航, 沈福,等. 秦山核电厂气态流出物气溶胶粒径分布测量[J]. 辐射防护, 2017, 37(4):249-253.HOU Jie, LI Hang, SHEN Fu, et al. Measurement of aerosol particle size distribution in gaseous effluents of Qinshan nuclear power plant[J]. Radiation Protection, 2017, 37(4):249-253.
[2]	唐玉琴. 三门核电站烟囱流出物取样方式探讨[J]. 辐射防护通讯, 2013, 33(1):24-30.TANG yuqin. Discussion on samping method for stack effluent at Sanmen NPP[J]. Radiation Pretection Bulletin, 2013, 33(1):24-30.
[3]	Mcfarland A R, Rodgers J C. Single-point representative sampling with shrouded probes[R]. Texas: Los Alamos National Laboratory, 1993.
[4]	夏益华, 王绍林. 辐射环境监测的取样代表性及某些相关问题[J]. 辐射防护, 2017, 37(4):327-336.XIA Yihua, WANG Shaolin. Issues on the representativeness of sampling in environmental radiation monitoring[J]. Radiation Protection, 2017, 37(4):327-336.
[5]	丁世海, 许光, 尹振羽,等. 应用计算流体动力学分析烟囱气载流出物取样的混合均匀性[J]. 核电子学与探测技术, 2012, 32(3):260-264.DING Shihai, XU Guang, YIN Zhenyu, et al. Computational Fluid Dynamics (CFD) analysis of Stack effluent sampling mixing uniformity[J]. Nuclear Electronics ＆ Detection Technology, 2012, 32(3):260-264.
[6]	Rodgers J C, Fairchild C I, Wood G O, et al. Single point aerosol sampling: evaluation of mixing and probe performance in a nuclear stack[J]. Health Physics, 1996, 70(1):25-35.
[7]	Anand M, Mcfarland A R, Rajagopal K R. Gas mixing for achieving suitable conditions for single point aerosol sampling in a straight tube: experimental and numerical results[J]. Health Physics, 2003, 84(1):82-91.
[8]	Ballinger M Y, Recknagle K P. Sampling point complicance tests for 325 building at set-back flow conditions[R]. Washington: Pacific Northwest National Laboratory, 2011.
[9]	Recknagle K, Yokuda S M, Barnett J. Scaled tests and modeling of effluent stack sampling location mixing[J]. Health Physics, 2009, 96(2):164.
[10]	Glissmeyer J A, Flaherty J E, Piepel G F. Assessment of the Group 5-6 (LB-C2, LB-S2, LV-S1) stack sampling probe locations for compliance with ANSI/HPS N13.1 1999[R]. Office of Scientific & Technical Information Technical Reports, 2011.
[11]	吕和生, 林腾蛟, 张世军,等. 湿式多片摩擦离合器油路三维流场分析[J]. 中国机械工程, 2009, 20(16):1 978-1 982.Lv Hesheng, LIN Tengjiao, ZHANG Shijun, et al. 3-D flow analysis of oil channel in wet multi-disc friction clutch[J]. China Mechanical Engineering, 2009, 20(16):1 978-1 982.
[12]	Dutta P, Saha S K, Nandi N, et al. Numerical study on flow separation in 90° pipe bend under high Reynolds number by k-ε modelling[J]. Engineering Science & Technology-An International Journal, 2016, 19(2):904-910.
[13]	杨光俊, 丁力, 郭照冰. 基于CFD方法的燃煤电厂烟气排放数值模拟[J]. 环境科学研究, 2017, 30(12):1 934-1 943.YANG Guangjun, DING Li, GUO Zhanbing. Numerical simulation of flue gas emissions from coal-fired power plants using computational fluid dynamics method[J]. Research of Environmental Sciences, 2017, 30(12):1 934-1 943.
[14]	ISO. Sampling airborne radioactive materials from the stacks and ducts of nuclear facilities:ISO 2889—2010 [S]. 2010.
[15]	Han T, O′Neal D L, Mcfarland A R, et al. Evaluation of mixing elements in an L-shaped configuration for application to single-point aerosol sampling in ducts[J]. Hvac & R Research, 2005, 11(4):657-672.
[16]	ISO. Stationary source emissiions. Measurement of velocity and volume flow rate of gas stream:ISO 10780-1994 [S]. 1994.