低温LNG管路绝热设计及分析  

Design and Analysis for Cryogenic LNG Pipelines Insulation

作　　者：王晓亮 张晓平 赵超 王廷勇 WANG Xiaoliang;ZHANG Xiaoping;ZHAO Chao;WANG Tingyong(Sunrui Marine Environment Engineering Co.,Ltd.,Qingdao 266101,China)

机构地区：[1]青岛双瑞海洋环境工程股份有限公司,山东青岛266101

出　　处：《山东化工》2025年第7期223-225,251,共4页Shandong Chemical Industry

基　　金：山东省重点研发计划(2023CXGC010404);青岛市关键技术攻关及产业化示范(23-1-3-hygg-8-hy)。

摘　　要：液化天然气(LNG)密度是标准状态下天然气密度的600多倍,在天然气输送的过程中,通常采用天然气液化进行输送。为防止LNG吸热汽化,而导致输送管道超压,LNG输送时需要采用低温绝热技术对管道进行绝热。本文针对低温LNG管路堆积绝热,采用表面温度法,分别在假设外表面温度为定值和对绝热层外表面温度进行迭代核算下进行绝热设计,并采用ANSYS对表面温度法计算结果进行模拟分析。结果表明面温度法直接计算得到的低温绝热计算结果合理可靠,通过对绝热层厚度进行迭代核算,可以在达到绝热目的前提下,减少绝热层厚度。Liquefied natural gas(LNG)has a density more than 600 times that of natural gas in its standard state.In the process of natural gas transmission,natural gas liquefaction is usually used for transportation.In order to prevent LNG from absorbing heat and vaporizing,which leads to overpressure in the transmission pipeline,low-temperature insulation technology is needed to insulate the pipeline during LNG transmission.In this paper,for the low-temperature LNG pipeline stacking insulation,the surface temperature method is adopted,and the insulation design is carried out under the assumption that the temperature of the outer surface is a constant value and the iterative accounting of the temperature of the outer surface of the insulating layer,respectively,and the results of the surface temperature method are simulated and analysed by ANSYS.The results show that the low-temperature insulation calculation results obtained directly by the surface temperature method are reasonable and reliable,and the thickness of the insulation layer can be reduced under the premise of achieving the purpose of adiabatic insulation by iterative calculation of the thickness of the insulation layer.

关 键 词：LNG管道绝热 表面温度法 冷损失 外表面温度 

分 类 号：TE973.1[石油与天然气工程—石油机械设备]