A Study On Quality Assurance And Evaluation Of Uncertainty For The Analysis Of Natural Gas

ANALYTICAL SCIENCE AND TECHNOLOGY(2006)

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摘要
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 +/- 1.9% (relative and 95% level of confidence) and 6.26 % mol/mol +/- 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.
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关键词
Analysis of LNG, quality assurance, measurement uncertainty, gas CRM, non-lineality, drift, sampling
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