Abstract
Erosion is one of the important reasons for the thickness decrease and perforation of the pipe walls. Understanding the gas–solid two-phase flow pipe erosion mechanism is the basis for monitoring pipe erosion. According to the structural characteristics and working conditions of the gas–solid two-phase flow pipeline in a gas transmission station, a gas–solid two-phase flow pipe erosion finite element model was established and validated by combining it with field test data. Then, the gas–solid two-phase flow pipeline erosion characteristics under different pressures, solid contents, throttle valve openings, and pipe diameters were studied. On this basis, a maximum erosion rate prediction equation was put forward after verification by using actual wall thickness detection data. Results show the following: (1) The absolute error of the maximum erosion rate between the model results and the test datum is ≤10.75%. (2) The outer cambered surface of the bend after the throttle valve is the most seriously eroded areas. (3) The maximum erosion rate increases with pressure, solid content and throttle valve opening increasing, but, along with the change of the pipe diameter, the maximum erosion rate increases at first and then decreases with pipe diameter increasing for throttle valve openings of 20% and 30%, and it decreases with pipe diameter increasing for a throttle valve opening of 50%. (4) A maximum erosion rate prediction equation, involving pressure, solid content, opening of the throttle valve, and pipe diameter, is proposed and is verified that the absolute percentage error between the prediction equation calculation results and the field test datum is ≤11.11%. It would seem that this maximum erosion rate prediction equation effectively improves the accuracy of predicting the gas–solid two-phase flow pipe erosion rate in a gas transmission station.
Highlights
Erosion, one of the important reasons for material damage or equipment failure, has become the most common form of gas pipeline damage [1]
The erosion characteristics of gas–solid two-phase flow pipeline have been simulated with different pressures, solid contents, throttle valve openings, and pipe diameters
For a certain solid content, opening of the throttle valve, and pipe diameter, the laws of the most serious erosion area and maximum erosion rate varying with pressure are the same
Summary
One of the important reasons for material damage or equipment failure, has become the most common form of gas pipeline damage [1]. Gas transmission stations in a given area, over six years, have undergone pipe perforations five times and serious pipe wall thinning three times. These pipe perforation events have not been identified in advance and serious pipe wall thinning events have been found occasionally in the Energies 2018, 11, 2773; doi:10.3390/en11102773 www.mdpi.com/journal/energies. Perforation on the one and hand, pipepipe perforation and are of great safety concern for the gas transmission station operation; on the other hand, there have severe pipe wall thinning are of great safety concern for the gas transmission station operation; on been no reliable methods predict the degree of pipeline erosion.
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