SHI Qian¹, ZHANG Tianqi², YU Suyuan²

(1. China National Intellectual Property Administration, Beijing 100088, China;2. Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China)

Abstract：The steam generator of high temperature gas-cooled reactor is the key energy conversion unit in the primary circuit, and is also the main place for the deposition of radioactive graphite dust. In order to investigate the resuspension characteristics of graphite dust in the steam generator, numerical simulations were used to calculate the flow field and heat transfer temperature field distribution in the steam generator. Based on multi-layer particles recursive model and Rock′n′roll resuspension model, a multi-layer fine particle resuspension model was established. Combined with numerical simulation and multi-layer fine particle resuspension model, the effects of airflow friction velocity, number of sedimentary layers, particle size and different regions of the steam generator on the resuspension characteristics of graphite dust were discussed. The results show that in each section of the steam generator, the friction velocity of the fluid is the lowest near the windward and leeward points of the heat exchange tube, while it reaches the maximum at the points near the inner sleeve side and the outer sleeve side. Driven by fluid flow, the resuspension fraction decreases with the increase of the number of layers. Smaller particles are less likely to be resuspended and need to reach a certain velocity before they are ‘lifted’. Larger particles have a greater resuspension rate at the same friction velocity. The higher the power level of the reactor, the greater the share of particles deposited on the steam generator wall that are resuspended. At a given power level, the share of particles that are resuspended in the subcooled, bubble-core boiling, film-boiling and superheated sections of the steam generator tends to increase gradually.

Keywords：graphite dust; high temperature gas-cooled reactor; steam generator; resuspension characteristic

Get Citation：SHI Q, ZHANG T Q, YU S Y. Resuspension behavior of dust particles in steam generator of high temperature gas-cooled reactor[J]. China Powder Science and Technology, 2023, 29(4): 1-10.

DOI：10.13732/j.issn.1008-5548.2023.04.001

Received：2022-12-21,Revised：2023-03-01,Online：2023-05-10 09:17。

Funding Project：国家重点研发计划项目,编号:2020YFB1901401。

First Author：石倩(1975—),女,审查员,硕士,研究方向为机械设计与制造。E-mail: shiqian@tsinghua.edu.cn。

Corresponding Author：于溯源(1965—),男,教授,博士,博士生导师,研究方向为核反应工程、颗粒动力学。E-mail:suyuan@tsinghua.edu.cn。