Indirect measurement of nitrogen in a multi-component natural gas by heating the gas
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United States of America Patent
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Jun 22, 2004
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app pub date -
Jun 12, 2003
filing date -
Apr 17, 2000
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Abstract
Methods of indirectly measuring the nitrogen concentration in a natural gas by heating the gas. In two embodiments, the heating energy is correlated to the speed of sound in the gas, the diluent concentrations in the gas, and constant values, resulting in a model equation. Regression analysis is used to calculate the constant values, which can then be substituted into the model equation. If the diluent concentrations other than nitrogen (typically carbon dioxide) are known, the model equation can be solved for the nitrogen concentration.
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