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Title: Indirect measurement of diluents in a multi-component natural gas

Patent ·
OSTI ID:1175665

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.

Research Organization:
Southwest Research Institute, San Antonio, TX (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
FC21-96MC33033
Assignee:
Southwest Research Institute
Patent Number(s):
7,010,433
Application Number:
10/809,097
OSTI ID:
1175665
Country of Publication:
United States
Language:
English