关键词: 流动加速腐蚀, Fluent, 物性参数, 温度, 传质系数

Abstract: In the operation of steam pipe of power plant, flow accelerated corrosion (FAC) is widespread and threatens the pipeline system. In order to predict the accelerated corrosion of power plant pipelines, the subject is based on the actual working conditions of power plant pipelines. The fluid dynamics software is used to adjust the physical parameters of water according to the temperature change, simulate the flow field under the orifice pipe, and observe the high speed and high turbulence. In the kinetic energy distribution region, the changes of solubility, velocity, wall shear force and mass transfer coefficient at different temperatures were simulated and compared with the flow accelerated corrosion prediction model to more accurately analyze the effect of temperature on flow accelerated corrosion. The results show that the temperature affects the wall shear force and mass transfer coefficient, and finally affects the FAC rate. The mass transfer coefficient and solubility are affected by temperature. Below 150℃, the effect of temperature on the FAC rate is significant and mainly achieved by mass transfer coefficients; the FAC rate peaks between Z/D≈0.7-1.0, and the second peak appears between Z/D≈3.8-4.3, which is the high-risk corrosion area of the orifice tube.

Key words: flow accelerated corrosion, fluent, physical parameters, temperature, mass transfer coefficient