Investigation of flow accelerated corrosion in large bore piping components

大口径管道部件流动加速腐蚀研究

• 批准号: 412425-2011
• 负责人: Ching, Chan
• 金额: $ 4.1万
• 依托单位: McMaster University
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2012
• 资助国家: 加拿大
• 起止时间: 2012-01-01 至 2013-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=498646
• 关键词: Investigation; flow; accelerated; corrosion; large

Flow Accelerated Corrosion (FAC) is a serious safety and reliability problem facing aging power generation plants, especially nuclear power plants (NPP). It results in the thinning and weakening of the pipe wall and can lead to premature component failure. FAC involves a chemical process at the surface and the transport of species from the wall to the fluid. Thus, the control of FAC in practical applications requires the identification of regions with changes in flow chemistry or regions of high local mass transfer. Increases in the local mass transfer rate from the wall can occur at a number of locations in a flow where the flow pattern changes rapidly, including elbows, tee junctions, and expansions. The positioning of piping components in close proximity, such as back-to-back elbows, results in a further increase in the mass transfer rate in the second element. In an

流动加速腐蚀（FAC）是老化电厂特别是核电站面临的一个严重的安全可靠性问题。它会导致管壁变薄和变弱，并可能导致部件过早失效。FAC涉及表面的化学过程和物质从壁到流体的运输。因此，在实际应用中FAC的控制需要识别流动化学变化区域或高局部传质区域。壁面局部传质速率的增加可以发生在流型变化迅速的许多位置，包括弯头、三通和膨胀处。将管道部件放置在距离较近的位置，例如背靠背的弯头，会进一步增加第二个元件的传质速率。在一个