摘要
在输气管道投产置换过程中,先通入氮气,形成一定的氮气长度,再通入天然气。采用FLUENT建立长分别为2 km、1 km的二维管道模型,研究几何模型长度与最大置换长度的关系,得出几何模型长度对最大置换长度不产生影响。采用FLUENT模拟数据,用最小二乘法拟合,推导出在管道内直径为457 mm、置换速度为3 m/s的条件下氮气长度与最大置换长度的拟合关系式,得出模拟值与拟合值基本吻合,拟合关系式具有一定实用性。氮气长度一定时,随着置换速度增加,最大置换长度缩短。
In the process of purging gas trans- mission pipeline for being put into service, nitrogen is first supplied, forming a certain nitrogen length, and then the natural gas is supplied. The two-dimensional model for pipeline with length of 2 km and 1 km re- spectively is established by FLUENT. The relationship between geometric model length and maximum purging length is studied. It is found that the geometric model length does not affect the maximum purging length. U- sing the simulation data of FLUENT and fitted by the least square method, the fitting relation between the ni- trogen length and the maximum purging length is de- rived when the diameter of the pipe is 457 mm and the purging rate is 3 m/s. The simulation results are basi- cally consistent with the fitting values, and the fitting relation has some practicality. At a certain nitrogen length, the maximum pm＇ging length shortens with the increase of the purging rate.
出处
《煤气与热力》
2018年第2期33-36,共4页
Gas & Heat
