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Fluctuations in the price of natural gas make it critical to have
good control over the heating value of the final product. It is typical to
determine a value for natural gas by individually measuring the C1-C5
hydrocarbons with a backflush of C6+ hydrocarbons as an aggregate peak. Air and
Carbon Dioxide are also determined, but not Oxygen and Nitrogen. Unless Oxygen
and Nitrogen are individually measured, only gross air contamination of a sample
is detected. Small amounts of air contamination will affect the gas heating
value by adding to the air composite peak and reducing the hydrocarbon
concentrations after normalization. Separation of Natural Gas components through
the C8 hydrocarbons is becoming more common as a technique between the
traditional C6+ backflush method and extended analysis of natural gas.
This technique gives more information about the C6-C8 components for more precise calculation of heating value without the necessity to run the long extended analysis. Using a simple analysis approach, the values for Oxygen and Nitrogen can be determined along with the heating value of the hydrocarbons. Data and methods are presented. |
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