In recent years,the external heat withdrawal U outlet pipeline of the fluidized bed reactor of the third acrylonitrile unit in a certain enterprise has leaked many times,and even caused unplanned shutdown of the unit,which has seriously affected the safe and stable operation of the unit.Through macroscopic inspection,hardness measurement,metallographic inspection,electron microscope and energy spectrum analysis,the results show that erosion corrosion is the main reason for thinning of pipeline elbow,which is aggravated by overtemperature in operation and defects in elbow area.The analysis of corrosion mechanism shows that five preventive measures,such as increasing bending ratio and controlling impurity content,can prolong the service life of pipe fittings.
acrylonitrilefluid bed reactorpipeline elbowerosion corrosioncorrosion mechanism
万方数据
维普
