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

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.

Inventors:
;
Publication Date:
Research Org.:
Southwest Research Institute, San Antonio, TX (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1175665
Patent Number(s):
7,010,433
Application Number:
10/809,097
Assignee:
Southwest Research Institute OSTI
DOE Contract Number:
FC21-96MC33033
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Morrow, Thomas B., and Owen, Thomas E. Indirect measurement of diluents in a multi-component natural gas. United States: N. p., 2006. Web.
Morrow, Thomas B., & Owen, Thomas E. Indirect measurement of diluents in a multi-component natural gas. United States.
Morrow, Thomas B., and Owen, Thomas E. Tue . "Indirect measurement of diluents in a multi-component natural gas". United States. doi:. https://www.osti.gov/servlets/purl/1175665.
@article{osti_1175665,
title = {Indirect measurement of diluents in a multi-component natural gas},
author = {Morrow, Thomas B. and Owen, Thomas E.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Mar 07 00:00:00 EST 2006},
month = {Tue Mar 07 00:00:00 EST 2006}
}

Patent:

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  • A methods of indirectly measuring the nitrogen concentration in a 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. Regression analysis is used to calculate the constant values, which can then be substituted into the model equation. If the speed of sound in the gas is measured at two states and diluent concentrations other than nitrogen (typically carbon dioxide) are known, two equations for molecular weight can be equated and solved for the nitrogenmore » concentration in the gas mixture.« less
  • 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.
  • A method and apparatus are disclosed for selectively removing a desired gaseous component from a gas stream containing at least two gaseous components and having a variable flow rate. The absorber is divided into at least two individual absorption volumes connected in series in which the gas and absorbent solution can countercurrently contact each other and includes means to control the passage of the fluid streams through the individual absorption volumes.
  • A method and apparatus are described for selectively removing a desired gaseous component from a gas stream containing at least 2 gaseous components and having a variable flow rate. The absorber is divided into at least 2 individual absorption volumes connected in series in which the gas and absorbent solution can countercurrently contact each other and includes means to control the passage of the fluid streams through the individual absorption volumes. 8 claims.
  • An excimer laser is described comprising: a gaseous gain medium comprising a buffer gas, xenon, and a fluorine donor gas; means for exciting the gain medium to form a quantity of the xenon fluoride excimer in the excited C state; and means for resonating or amplifying xenon fluoride C approaches A radiation of the 450-520 nm wavelength band in the gaseous gain medium, characterized in that: the buffer gas comprises first and second buffer gas constituents that are combined in a predetermined proportion such that the combined kinetic properties of the buffer gas are different from corresponding kinetic properties ofmore » any single buffer gas constituent. It is further characterized in that the first and second buffer gas constituents interact preferentially with different excited species within the gaseous gain medium resulting in optical properties of the gaseous gain medium that are different from corresponding optical properties of any gaseous gain medium having only a single buffer gas constituent. The combination of the combined kinetic properties and the combined optical properties are further adapted to enhance laser energy, efficiency, and spectral properties, and are different from that of any single buffer gas.« less