Life prediction of pulverized coal gasification transportation pipeline based on “First Pass Model”

For the coal gasification pipeline transportation,the failure caused by particle impact seriously affects the stability of transportation process and the safe operation of gasification production.By predicting the remaining service life of the pipeline,and reasonably carrying out the maintenance of the pulverized coal transportation pipeline system,the failure of the pipeline due to the erosion and abrasion of the pulverized coal can be effectively reduced,and the service life of the pipeline system can be increased,thereby ensuring the safety and reliability of the equipment run.We considered the structural parameters such as diameter,wall thickness and yield strength of pulverized coal transportation pipeline,and the random “excitation” factors such as pipeline internal pressure,erosion depth,length and rate,the failure probability model and life prediction method of pulverized coal gasification pipeline using the “first crossing model” are proposed.Based on the fluent simulation platform,the simulation model of pulverized coal gasification pipeline erosion was built.Through the sensitivity analysis of different erosion rate,pipe diameter,pipeline pressure and yield strength on the pipeline failure probability,the factors affecting the pipeline life were determined,and the remaining life of the pipeline was predicted.The results show that the safety service life of the coal gasification pipeline studied in this paper is about 40 years without regard to equipment maintenance.After the pipeline is put into use for 20-40 years,various factors that affect the life of the pipeline begin to manifest their effects,and the probability of failure shows an upward trend.Among them,the erosion pipeline parameter Vd=0.2 mm/a or VL=8.0 mm/a condition should be used as the key maintenance index of the pipeline.The larger pipe diameter shows better anti-erosion performance,and the pipe pressure is also an important factor affecting the failure assessment of the pipe.In the routine repair and maintenance of the pipeline,the pipeline erosion parameters should be considered as a priority focus on index maintenance,has raised the expected life of the pipeline.