秦山核电厂烟囱气体取样流场混合均匀性分析
王彤¹，徐佳林¹，李航²
（1. 中核核电运行管理有限公司，浙江  海盐  314300；2. 北京国原新技术有限公司，北京  102413）
摘要： 核电厂对烟囱排出的气体开展放射性活度检测，但由于气态放射性物质在管道或烟囱气体流场中分布不均匀，
可能会影响取样效果而导致样品缺少代表性。为了获得有代表性的检测样品，秦山核电厂开展烟囱气体流场混合均匀性
分析研究，参照ISO 2889—2010 Sampling Airborne Radioactive Materials from the Stacks and Ducts of Nuclear Facilities （《核
设施的烟囱和通风管道中放射性物质取样》） 和ANSI/HPS N13.1—2011 Sampling and Monitoring Releases of Airborne
Radioactive Substances from the Stacks and Ducts of Nuclearl Facilities （《核设施烟囱和管道中气载放射性物质释放的取样与
监测》）标准推荐方法，对烟囱取样位置处气体流场进行混合均匀性定量指标分析。由于秦山核电厂在2018 年对烟囱取
样系统实施了变更改造，取样系统布置位置由原烟囱标高71.6 m 处变更为烟囱标高50 m处。电厂以改造前、后烟囱取
样系统布置处的气体流场作为研究对象，运用流体动力学（CFD）方法对烟囱气体进行取样数值模拟计算，通过分析平
均气旋角、速度分布、示踪气体分布、示踪气体最大浓度偏差和示踪气溶胶分布等指标，来判定秦山核电厂烟囱取样处
气体流场的混合均匀情况。分析结果表明，秦山核电厂烟囱取样系统改造后烟囱标高50 m处的取样截面气体流场混合均
匀，能满足ISO 2889—2010 Sampling Airborne Radioactive Materials from the Stacks and Ducts of Nuclear Facilities （《核设施
的烟囱和通风管道中放射性物质取样》）和ANSI/HPS N13.1—2011 Sampling and Monitoring Releases of Airborne Radioactive
Substances from the Stacks and Ducts of Nuclearl Facilities （《核设施烟囱和管道中气载放射性物质释放的取样与监测》）标准
要求，在此处布置烟囱取样装置，能确保电厂开展的烟囱气体放射性活度测量能取到有代表性的样品。
关键词： 烟囱气体流场；混合均匀性；取样系统布置；取样数值模拟计算
中图分类号： TM623；TL84 文献标识码： A 文章编号： 2095-0802-(2021)04-0002-08
Analysis of Mixing Uniformity of Flue Gas Sampling Flow Field in Qinshan Nuclear Power Plant
WANG Tong¹, XU Jialin¹, LI Hang²
(1. China Nuclear Power Operation Management Co., Ltd., Haiyan 314300, Zhejiang, China; 2. Beijing Guoyuan New
Technology Co., Ltd., Beijing 102413, China)
Abstract: The radioactive activity of the gas discharged from the chimney is monitored in the nuclear power plant. However, due
to the uneven distribution of gaseous radioactive materials in the gas flow field of pipeline or chimney, the sampling effect may be
affected, resulting in the lack of representativeness of samples. In order to obtain representative test samples, Qinshan Nuclear
Power Plant carried out the analysis and research on the mixing uniformity of gas flow field in the chimney. According to the
recommended method of ISO 2889—2010 Sampling Airborne Radioactive Materials from the Stacks and Ducts of Nuclear
Facilities and ANSI/HPS N13.1—2011 Sampling and Monitoring Releases of Airborne Radioactive Substances from the Stacks
and Ducts of Nuclearl Facilities, the quantitative index of mixing uniformity of gas flow field at the sampling position of the
chimney was analyzed. Since Qinshan Nuclear Power Plant changed the sampling system of the chimney in 2018, the layout of the
sampling system was changed from the original chimney elevation of 71.6 m to the chimney elevation of 50 m. Taking the gas flow
field at the sampling system layout of the chimney before and after the reconstruction as the research object, the gas sampling
numerical simulation calculation of the chimney was carried out by using the computational fluid dynamics (CFD) method. The
mixing uniformity of gas flow field in the chimneys of Qinshan Nuclear Power Plant was determined by analyzing the average
cyclone angle, velocity distribution, tracer gas distribution, maximum concentration deviation of tracer gas and aerosol distribution.
The analysis results show that the gas flow field of the sampling section at the chimney elevation of 50 m after the reconstruction
of the chimney sampling system of Qinshan Nuclear Power Plant was well mixed, which can meet the requirements of ISO 2889—
2010 Sampling Airborne Radioactive Materials from the Stacks and Ducts of Nuclear Facilities and ANSI/HPS N13.1—2011 Sampling and Monitoring Releases of Airborne Radioactive Substances from the Stacks and Ducts of Nuclearl Facilities standard.
The arrangement of the chimney sampling device here can ensure that the representative samples can be obtained for the
measurement of the chimney gas radioactivity in the power plant.

Key words: chimney gas flow field; mixing uniformity; sampling system layout; sampling numerical simulation