Study On Leakage And Diffusion Of Corroded Natural Gas Pipeline In Underground Engineering

Natural gas is a kind of environment-friendly energy,along with the people's growing demand for natural gas resources,makes the natural gas industry is developing rapidly.The underground engineering,the natural gas industry is very important,influence the development of the city.For the transportation of natural gas mainly adopts pipeline transport,due to the risk of natural gas pipeline,so the general laying underground pipelines,natural gas transportation.But the corrosive gases in the piping to a great extent,affected the normal operation of the pipeline,so in this paper,both the corrosion of gas pipeline in underground engineering research.This paper first analyzes the reasons of pipeline internal corrosion,and on both simulated and equivalent corrosion of pipeline.Through the analysis found that with the increase of pipeline operation pressure and the safety of the pipeline are falling.With the increase of pipe diameter,the safety of the pipeline increases.And bending the pipe compared with not bend pipe,analyzes the two kinds of the security of pipeline at run time,found without bending pipe is bent pipe safer,and with the increase of bending Angle,the safety of the pipeline are falling.Second,to simulate the buried gas pipeline leak diffusion research.Through simulation study found: in the case of leakage,leakage of gas pipeline with mouth diameter and the increase of pipeline operation pressure,at the same time,vertical leak leakage at the mouth of the distance is increased gradually,the leakage of pipeline operation pressure and diameter increases can reduce the safety of the pipeline.Finally,this article on the basis of Baotou city gas pipe gallery modeling,analysis of pipes in different utility tunnel ventilation velocity,different leak mouth diameter and different pipeline operation pressure,a balanced leak could cause explosion area after the moving characteristics of size and scope.Through simulation study found: in the case of leakage,the pipe gallery in pipeline operation pressure is 0.8 MPa,could cause explosion range is relatively small,the operating pressure is 0.8 MPa,the utility tunnel safety is higher;With the increase of utility tunnel ventilation velocity,the more concentrated the explosion of regional centers in leakage around the mouth,and 3 m/s and 4 m/s explosion regional centers,namely 3 m/s is a relatively economic ventilation speed;With the increase of utility tunnel in the pipeline leakage mouth diameter,the explosion of regional centers around the mouth leakage from left to right and moving in the direction of the outlet.