Research On Numerical Simulation Of Multiphase Flow For Erosion Destruction Of Pipe

For the cracking failure caused by erosion destruction, the pipe was regarded as investigate object in this paper. The simulation research on erosion destruction of the petrochemical pipe was focused on the condition of multi-phase flow. The research method was fixed on CFD simulation of multi-phase flow after the definitions being gave on three-phase flow. The dangerous work condition and the effect parameters of most menace were gave. The simulation was executed to the all-directions calculation, analysis and comparison in the case of various work conditions, variety shape and structure, various matter parameters, various installing part, etc. Then the relation between flow and erosion was aimed at to study under the dangerous work condition. The exact position thin rapidly of some typical pipes with erosion was found by CFD simulation. The regulations on typical petrifaction pipes' erosion destruction were summarized. The main factors causing erosion destruction were found.The main contents of this paper were summarized as follows.First, some conclusions gave in the past research about horizontal sudden expansion pipe's erosion destruction were validated. On this base, the results of CFD simulation about sudden expansion pipe's erosion destruction when the parameters as phase composition, flow direction, boundary condition, sudden expansion ratio were altered were analyzed. The regulations on erosion destruction of sudden expansion pipe were summarized and the main factors causing erosion destruction were found.Second, the method on CFD simulation modeling of elbow was established. The exact position where was weak rapidly by erosion in elbow was found by multi-phase flow simulation. For the sake of summarizing erosion destruction regulations, the simulations were performed in the case of alternant elbow's parameter as specification, configuration, phase composition, flow direction, boundary condition. The simulation results were analyzed for getting the main factors causing erosion destruction.Last, the method on modeling for CFD simulation of covergent-divergent nozzle was gave according as above researches. The exact position where was weak rapidly by erosion in covergent-divergent nozzle was found. The effects caused by the varietyof covergent-divergent nozzle diameter and configuration were brought forward by CFD simulation. The regulations on erosion destruction of covergent-divergent nozzle were summarized.The research results are in accordance with the dissection phenomena of the real objects and ensample demonstrated in API-RP-932.This indicated that the method with CFD simulation can effectively reveal the mechanism of the erosion destruction which occurred in the petrochemical piping under the condition of oil-gas-water three phase flow. The conclusions are competent for guiding the actual fixed-point check and structures betterment.