液化天然气管道输送工艺参数的计算  

Calculation of transmission process parameters for LNG pipeline

作　　者：陈保东[1] 李庆杰[1] 洪丽娜[2] 岳春光 

机构地区：[1]辽宁石油化工大学,辽宁抚顺113001 [2]辽河油田公司锦州采油厂,辽宁锦州121000 [3]营口港务集团第五港务公司,辽宁营口115000

出　　处：《油气储运》2011年第1期15-17,4,共3页Oil & Gas Storage and Transportation

摘　　要：LNG在管道输送过程中的物性参数可以通过LKP方程及其关联式确定,Lee-Kesler分别应用氩和正辛烷的实验数据拟合确定了该方程简单流体和参考流体的常数项。分别给出了用对比密度表示的LKP方程表达式和LNG混合物粘度的计算公式,利用对比态原理(CSP)计算比定压热容的表达式。利用"过冷"态原理进行无气化LNG管道输送工艺参数的计算,给出了管道水力、热力参数和保冷层厚度的计算方法。以大连LNG接收站为例,对1条长6 km、高程差48.5 m管道的运行参数进行计算,求得管道压降为0.338 MPa,保冷层厚度为0.145 mm,管输介质到达管道终点的温度为-154℃,因此在1.194 MPa的输送压力下,LNG全程处于液化状态,验证了LNG在"过冷"状态下输送的可行性。The physical parameters of LNG during pipelining can be determined by LKP and its correlation equations. The constant items of simple fluid and reference fluid in LKP equation were respectively obtained through fitting the experimental data of argon and normal octane by Lee-Kesler. In this article,LKP equation expression with contrast density,constant pressure heat capacity expression with calculating states principle (CSP)and the mixture viscosity calculation formula of LNG were given. The 'super-cooling' state principle was used to calculate the pipeline transmission process parameters of non-gasified LNG pipeline. The calculation method for hydraulic,thermodynamic parameters of pipe and the thickness of cold insulation layer were also given. Taking the Dalian LNG receiving terminal as an example,if the operational parameters of a 6 km-long pipe with the elevation difference of 48.5 m were calculated,the following results would be obtained: (1)the pressure drop of the pipe was 0.338 MPa,(2)the thickness of cold insulation layer was 0.145 mm,(3)the transmission temperature of LNG was at -154 ℃ when the LNG was pumped to the terminal. Therefore,if transmission pressure were at 1.194 MPa,LNG would be kept liquefied state in the whole pipeline. The transmission feasibility of LNG under 'super-cooling' state was also verified.

关 键 词：液化天然气(LNG) 管道输送 物性参数 工艺参数 计算 保冷层 厚度 “过冷”态 

分 类 号：TE866[石油与天然气工程—油气储运工程]