Indirect measurement of diluents in a multi-component natural gas
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United States of America Patent
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Mar 7, 2006
Grant Date -
Nov 4, 2004
app pub date -
Mar 25, 2004
filing date -
Mar 27, 2003
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Abstract
A method of indirectly measuring the diluent (nitrogen and carbon dioxide) concentrations in a natural gas mixture. The molecular weight of the gas is modeled as a function of the speed of sound in the gas, the diluent concentrations in the gas, and constant values, resulting in a model equation. A set of reference gas mixtures with known molecular weights and diluent concentrations is used to calculate the constant values. For the gas in question, if the speed of sound in the gas is measured at three states, the three resulting expressions of molecular weight can be solved for the nitrogen and carbon dioxide concentrations in the gas mixture.
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