Research On The Mechanism Of Flow Accelerated Corrosion And Its Countermeasures Of Water-steam System In Power Station

Flow accelerated corrosion (FAC) occurred in Power plant water system has caused a lot of major accidents, such as Pleasant Prairie power plant accident which had resulted in five deaths and six injuries in1995and Mihama nuclear accident in Japan which had resulted in4dead4injured in2004.These accidents have caused the world’s attention on FAC. At present, the unit also had burst pipes working in high operating parameters due to increasing corrosion problems. The working fluid parameters in water system has very important impacts on different parts of the pipe corrosion.Flow accelerated corrosion has led to the dissolution of the protective oxide film, thinning of pipe wall, as well as a short cut to reduce the safe operation of equipment performance life. FAC driven mechanism can be understood in two ways. From a dynamic point of view, it is an extension of the static uniform corrosion in water, and the most important difference between static state and dynamic state is that the static uniform corrosion has liquidity factors on the oxide layer/solution interface boundary.This paper has systematically studied the mechanism and characteristics of flow accelerated corrosion, flow accelerated corrosion prone position. By studying the flow accelerated corrosion, the adding oxygen treatment has been proposed. Finally, this paper has analysis the experimental pipeline passivation process in Cangdong Guohua Power Plant Case. Comprehensive analysis of the effects of various parameters on the FAC has been done. FAC suppression measures have been proposed, which have directive significance for chemical control in power plant.