Sustainable Mining and Metallurgy

The eccentric reducer is one of the common components in industrial pipeline systems such as electricity, petroleum, and chemicals. The internal flow of eccentric reducers is influenced by changes in pipe diameter, which can lead to issues with flow accelerated corrosion. Based on computational fluid dynamics simulation，the fluid dynamic characteristics of eccentric reducers at different aperture ratios (ε=0.4~0.7) and velocities (1~7m/s) were investigated. The Sanchez Caldera model was used to analyze the distribution of flow acceleration corrosion rates in downstream pipelines of eccentric reducers . The results show that the location prone to failure in the downstream of eccentric reducers is on the side with the small aperture. Under the condition of inlet flow rate of 3m/s, as the ratio increases, the sensitive position for flow acceleration corrosion in downstream pipelines moves upwards. Under the condition of pore size ratio of 0.6, the flow accelerated corrosion rate increases significantly with the increase of inlet flow rate,changes in flow velocity have no effect on the sensitive position for flow acceleration corrosion in downstream pipelines.