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Inferential determination of various properties of a gas mixture

United States Patent

March 27, 2007
View the Complete Patent at the US Patent & Trademark Office
Methods for inferentially determining various properties of a gas mixture, when the speed of sound in the gas is known at an arbitrary temperature and pressure. The method can be applied to natural gas mixtures, where the known parameters are the sound speed, temperature, pressure, and concentrations of any dilute components of the gas. The method uses a set of reference gases and their calculated density and speed of sound values to estimate the density of the subject gas. Additional calculations can be made to estimate the molecular weight of the subject gas, which can then be used as the basis for heating value calculations. The method may also be applied to inferentially determine density and molecular weight for gas mixtures other than natural gases.
Morrow; Thomas B. (San Antonio, TX), Behring, II; Kendricks A. (Torrance, CA)
Southwest Research Institute (San Antonio, TX), Gas Research Institute (Des Plaines, IL)
11/ 006,243
December 7, 2004
GOVERNMENT LICENSE RIGHTS The U.S. Government has a paid-up license in this invention and the right in certain circumstances to require the patent owner to license others on reasonable terms as provided for by the terms of Contract No. DE-FC21-96MC33033 for the U.S. Department of Energy.