Study On Elbow Erosion And Anti-Erosion Optimization Of Gas Supercharged Station

The gas pipeline booster station plays an important role of natural gas compression.Due to the limited separation capacity of the separator in the process zone of the natural gas booster station,the separated natural gas is still doped with a small amount of solid particles.At the same time,the natural gas pressure in the pipeline of the booster station process area is high,the velocity is fast,and the pipeline still has severe vibration.These factors will inevitably aggravate the erosion wear of solid particles on the elbow.Therefore,it is necessary to study the erosion wear characteristics of the elbow of the booster station.In this paper,the basic research of erosion is carried out from three aspects:erosion wear basic theory,erosion wear prediction model and erosion influencing factors.The erosion wear prediction model suitable for this paper is determined by comparing the prediction results of the erosion prediction model with the experimental values.Based on the relevant theory,four rationality assumptions are proposed for the solid particle and wall physical property parameters.Eight kinds of gas-solid two-phase elbow flow erosion models were established based on the field data of Wuhan gas transmission booster station.The continuous phase is simulated by RNG turbulence equation,and the gas state equation and vibration equation are compiled by UDF to consider the influence of pressure on gas density and pipeline.The DPM module was used to calculate the particle trajectory,and the PISO algorithm was used to solve the pressure-velocity coupling equation.In order to reduce the maximum erosion rate of the elbow,a three-stage elbow is designed and optimized by Comsol.It turns out that the flow field is more stable and the maximum erosion rate is greatly reduced.It has a degree of significance for the study of the anti-erosion structure of the elbow pipe in the future.In summary,this paper combined numerical simulation to study the influence of various factors on the erosion characteristics of the bending pipe of the gas pipeline supercharging station.At the same time,the design of the three-stage curved pipe structure has a certain guiding significance for the study of the anti-erosion structure of the curved pipe in the future.