A study on quality assurance and evaluation of uncertainty for the analysis of natural gas

우진춘; 김용두; 배현길; 이강진; 허재영

오늘 하루 그만보기

P-ISSN1225-0163
E-ISSN2288-8985
SCOPUS, ESCI, KCI

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P-ISSN 1225-0163
E-ISSN 2288-8985

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Vol.19, No.6

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A study on quality assurance and evaluation of uncertainty for the analysis of natural gas

Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985

2006, v.19 no.6, pp.490-497

& (2006). A study on quality assurance and evaluation of uncertainty for the analysis of natural gas. , 19(6), 490-497.

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Abstract

The sources of uncertainty in the analysis of liquified natural gas (LNG) process are evaluated. The uncertainty sources evaluated are the repeatability of measurement, non-linearity of GC, the uncertainty of standard gas used for calibration, difference of gas sampling and deviation after GC calibration and major revealed sources are the non-linearity of GC, the uncertainty of standard gas and the deviation after GC calibration. The determined values and uncertainties of methane and ethane as the major components are $90.0%mol/mol{\pm}1.9%$ (relative and 95% level of confidence) and $6.26%mol/mol{\pm}0.08$ (relative and 95% level of confidence), respectively. The contribution of uncertainty varies depending on the source of uncertainty and gas component. In the case of methane, non-linearity of GC, the uncertainty of standard gas and deviation after GC calibration contribute 0.28%, 0.25% and 0.24% of relative expanded uncertainty, respectively.