基于二元回归法准确快速预测天然气纯组分黏度  

Accurate and fast prediction of the viscosity of natural gas components based on the binary regression analysis method

作　　者：王巍[1] 赵朔[1] 王晓放[1] 徐宝鹏[1] 徐瑞铎 WANG Wei ZHAO Shuo WANG XiaoFang XU BaoPeng XU RuiDuo(Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education School of Energy and Power Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China)

机构地区：[1]大连理工大学能源与动力学院海洋能源利用与节能教育部重点实验室,辽宁大连116024

出　　处：《北京化工大学学报（自然科学版）》2017年第2期13-19,共7页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：辽宁省自然科学基金(2014020013);国家重点研发计划(2016YFB06001)

摘　　要：为了准确快速预测天然气纯组分的黏度,基于多元函数微积分计算原理,提出了一种新的天然气纯组分黏度的二元回归分析方法,将黏度拟合为温度和压力表示的函数μ=f(T,p)。在所研究的温度、压力范围内(230 K≤T≤450 K,p≤20 MPa),根据定温下黏度的μ-p曲线簇变化规律,以纯组分的临界温度Tc的范围为基准,将天然气各组分分为3类:Tc≤230 K,Tc≥450 K和230 K<Tc<450 K,并针对前两类组分,分别以CH4、i C5H12为例,对其黏度数据进行回归分析,得到黏度与温度、压力的函数关系式。将回归分析预测结果分别与数据源reference fluid properties(REFPROP)软件及实验数据对比,结果表明:预测结果与REFPROP及实验数据的平均相对误差均小于1%,满足工程精度要求。In order to accurately predict the viscosity of natural gas components, a binary regression analysis method is proposed in this work and the viscosity is expressed as a function of pressure and temperature. It is based on the principle of multivariate function calculus. In the range of temperature and pressure （230 K ≤ T≤450 K,p ≤20 MPa）, for some components, the curves of viscosity with pressure at constant temperature have a certain regularity. The natural gas components are divided into three groups （ To ≤ 230 K, To ≥450 K and 230 K 〈 To 〈 450 K） according to the range of their critical temperature Tc. In order to demonstrate the binary regression analysis method, CH4 and iC5H12 were chosen from the first two groups as examples to make a regression analysis, by means of which the relationship between viscosity with temperature and pressure was determined. Compared to the REFPROP method and experimental data, in both cases the average absolute errors of the results of fitting were found to be less than 1% in the prediction of viscosity, which meet the requirements of engineering accuracy.

关 键 词：天然气 纯组分 黏度 回归分析 

分 类 号：TE01[石油与天然气工程]