Numerical Analysis of Multiphase-flowing for Failure of High Pressure Air Cooler Bundle in Hydrogenated Cracking Unit

The numerical calculation of multiphase-flowing was carried out for the fluid in the air cooler bundle in hydrogenated cracking unit and the results were detailedly analyzed.The influence of the end structure of lining pipe of the bundle on the failure was analyzed.The 90-degree end would cause vortex in fluid at backward position where the high shearing force came into being and erosion-corrosion was easily to occur.But the structures of 45-degree chamfer end and 1∶10 taper could largely improve this situation.The influence of distribution of corrosion products on flowing situation of fluid was also analyzed.The velocity of flow in pipes was largely changed by non-uniform distribution of corrosion products.The high shearing force zone appeared in backward position where the products was thickest and erosion-corrosion occured.Caculation results are accordant with the failure position of the air cooler bundle.