石油与天然气化工2024，Vol.53Issue(3)：123-129,7.DOI:10.3969/j.issn.1007-3426.2024.03.019
天然气中水含量与水露点换算关系探讨
Conversion relationship between water content and water dew point in natural gas
摘要
Abstract
Objective Experimental and mathematical fitting methods are used to develop a new approach for converting water content to dew point in natural gas to enhance conversion accuracy and reduce errors.Methods This paper adopts the combined application of gas standard substances,portable dew point mirrors,and Matlab mathematical software.Using cubic spline interpolation technique,it establishes a novel method for converting water content to water dew point.Results By utilizing surface fitting for the conversion of water dew point,this method achieves a Mean Absolute Error(MAE)of 1.16 ℃ and a Root Mean Square Error(RMSE)of 2.28 ℃,meeting the reasonably acceptable maximum deviation of 2.8 ℃.By comparing this method with the domestic and international mainstream conversion methods,the average absolute deviation of the three methods are 0.46％(cubic spline interpolation),0.69％(GB/T 22634-2008 Conversion between water content and water dew point of natural gas),and 0.84％(ASTM D1142-95(2021)Standard test method for water vapor content of gaseous fuels by measurement of dew-point temperature),respectively,and the applicability of the three methods under different water content and pressure ranges is analyzed and explored.Conclusions Through comparative studies with experimental values,the cubic spline interpolation method shows better conversion accuracy for water volume fractions from 0 to 200X 10-6 compared to standard methods,effectively reducing the conversion error between water content and water dew point.关键词
天然气/水含量/水露点/三次样条插值Key words
natural gas/water content/water dew point/cubic spline interpolation引用本文复制引用
敬豪,曾文平,何斌,张镨,秦婧..天然气中水含量与水露点换算关系探讨[J].石油与天然气化工,2024,53(3):123-129,7.基金项目
中国石油西南油气田公司科研项目"天然气水露点在线分析仪性能评价技术及应用研究"(20230308-04) （20230308-04）
