천연가스 분석의 불확도 평가 및 품질 보증을 위한 연구

Abstract

The sources of uncertainty in the analysis of liquified natural gas (LNG) process are evaluated. Theuncertainty sources evaluated are the repeatability of measurement, non-linearity of GC, the uncertainty ofstandard gas used for calibration, difference of gas sampling and deviation after GC calibration and majorrevealed sources are the non-linearity of GC, the uncertainty of standard gas and the deviation after GCcalibration. The determined values and uncertainties of methane and ethane as the major components are 90.0%mol/mol± ±0.08 (relative and 95% level ofconfidence), respectively. The contribution of uncertainty varies depending on the source of uncertainty andgas component. In the case of methane, non-linearity of GC, the uncertainty of standard gas and deviationafter GC calibration contribute 0.28%, 0.25% and 0.24% of relative expanded uncertainty, respectively.