Erosion Regularities of Gas Pipelines Based On the Gas-Solid Two-Way Coupling Method

In order to study the erosion regularities of pipelines with gas-solid flow and to predict the location where the maximum erosion occurs, the Eulerian-Lagrangian method was employed to calculate the gas-solid flow inner the pipeline. The gas phase flow field was calculated under the Eulerian coordinate system and the trajectory of particles were calculated under the Lagrangian coordinate system. The DNV erosion model and Forder et al. particle-wall collision model were used to calculate the erosion rate of the pipe wall. The two-way coupling method was taken into consideration in the process of numerical calculation. Multiple models are combined to study the erosion rate and the maximum erosion location of elbows under the conditions of five parameters which exert the most serious effect on erosion, including pipe diameter, particle diameter, inlet velocity, etc. The results show that: (1) the maximum erosion location of the pipe bend is sensitive with the change of the bend orientation, pipe diameter and inlet velocity; (2) the critical diameter of solid particle is proposed and the erosion regularities differ significantly before and after the critical diameter.