天然气管道的流动方程讨论.ppt

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,*,天然气管道的流动方程讨论,天然气压缩因子图,compressibility factor,又称,gas deviation factor,Supercompressibility,factor,Fpv,Standing-Katz chart,Dranchuk,Purvis,and Robinson Method,A,1,=0.31506237,A,2,=-1.04670990,A,3,=-0.57832729,A,4,=0.53530771,A,5,=-0.61232032,A,6,=-0.10488813,A,7,=0.68157001,A,8,=0.68446549,P,pr,=pseudo-reduced pressure,T,pr,=pseudo-reduced temperature,计算拟临界参数,Kay,氏法则,用相对密度计算拟临界参数,G,气体相对密度,Tpc,拟临界温度，,o,R,Ppc,拟临界压力，,psia,1,psi,=6.895,kPa,CNGA,法,Pavg,平均气体压力，,psig,Tf,平均气体温度，,o,R,G ,气体相对密度,习题,由,83,的甲烷、,12,的乙烷和,5,的丙烷构成的天然气输送管线从一个处理厂向,100km,远的压气站输送流量为,3x10,7,m,7,/,天的气体。管道可假定沿很平坦的地势敷设，起点压力为,8500kPa,，末端最小压力是,5500,kPa,。计算要求的最小管道直径，假定管路效率是,0.95,，且燃气温度为,18,。考虑基准温度为,15,，基准压力为,101,kPa,下。,关于摩擦因子,Darcy friction factor,Fanning friction factor,Colebrook-White,方程,Colebrook-White,原方程,Colebrook-White,修正方程,输送因子,F,管材,粗糙度,mm,铆钢,0.9,到,9.0,型钢,/,焊钢,0.045,铸铁,0.26,镀锌铁,0.15,沥青铸铁,0.12,熟铁,0.045,PVC,，冷拉管，玻璃,0.0015,混凝土,0.3,到,3.0,AGA,（美国燃气协会）方程,对于完全紊流区,对于部分紊流区,D,f,（,Drag Factor,）管道的拖曳因子,F,t,冯,.,卡门光滑管输送因子,Df,是一个考虑了弯头，配件等数量的参数。它的取值范围是,0.90,到,0.99,。,弯头指数,极低,一般,极高,5,。,到,10,。,60,。,到,80,。,200,。,到,300,。,裸钢,0.975-0.973 0.960-0.956 0.930-0.900,塑料衬里,0.979-0.976 0.964-0.960 0.936-0.910,磨光的生铁,0.982-0.980 0.968-0.965 0.944-0.920,喷砂,0.985-0.983 0.976-0.970 0.951-0.930,