Method And Apparatus For Siloxane Measurements In A Biogas
First Claim
1. A method for monitoring one or more silicon-containing compounds present in a biogas, the method comprising:
- providing a non-absorptive gas to a sample cell, the non-absorptive gas having substantially no infrared absorptions in a specified wavelength range of interest;
obtaining a first spectral measurement from the sample cell;
providing a biogas to the sample cell;
obtaining a second spectral measurement from the sample cell;
generating a first absorption spectrum based on a ratio of the first spectral measurement and the second spectral measurement;
generating at least one surrogate absorption spectrum based on, at least, individual absorption spectrum for each of a subset of one or more silicon-containing compounds selected from a larger set of known silicon-containing compounds with known concentrations; and
calculating a total concentration of the one or more silicon-containing compounds in the biogas based on the first absorption spectrum and the at least one surrogate absorption spectrum.
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Abstract
A method is provided for monitoring one or more silicon-containing compounds present in a biogas. The method includes generating a first absorption spectrum based on a ratio of a first spectral measurement and a second spectral measurement. The first spectral measurement is from a non-absorptive gas having substantially no infrared absorptions in a specified wavelength range of interest and the second spectral measurement is from a sample gas comprising the biogas. The method includes generating at least one surrogate absorption spectrum based on, at least, individual absorption spectrum for each of a subset of one or more silicon-containing compounds selected from a larger set of known silicon-containing compounds with known concentrations. A total concentration of the one or more silicon-containing compounds in the biogas can be calculated based on the first absorption spectrum and the at least one surrogate absorption spectrum.
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Citations
33 Claims
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1. A method for monitoring one or more silicon-containing compounds present in a biogas, the method comprising:
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providing a non-absorptive gas to a sample cell, the non-absorptive gas having substantially no infrared absorptions in a specified wavelength range of interest; obtaining a first spectral measurement from the sample cell; providing a biogas to the sample cell; obtaining a second spectral measurement from the sample cell; generating a first absorption spectrum based on a ratio of the first spectral measurement and the second spectral measurement; generating at least one surrogate absorption spectrum based on, at least, individual absorption spectrum for each of a subset of one or more silicon-containing compounds selected from a larger set of known silicon-containing compounds with known concentrations; and calculating a total concentration of the one or more silicon-containing compounds in the biogas based on the first absorption spectrum and the at least one surrogate absorption spectrum. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A system for monitoring one or more silicon-containing compounds in a biogas, the system comprising:
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a source of a first beam of radiation; an interferometer receiving the first beam of radiation from the source and forming a second beam of radiation comprising an interference signal; a sample cell in optical communication with the interferometer; a flow mechanism establishing a first flow of a non-absorptive gas having substantially no infrared absorptions in a specified wavelength range of interest and a second flow of the biogas through the sample cell; a cooled detector in optical communication with the sample cell, the cooled detector receiving; a first interference signal propagating through the non-absorptive gas in the sample cell; and a second interference signal propagating through a sample gas in the sample cell, the sample gas comprising the biogas; a processor in electrical communication with the cooled detector, the processor configured to calculate a total concentration of the one or more silicon-containing compounds in the biogas based on; a first absorption spectrum based on a ratio of the first interference signal and the second interference signal; a set of surrogate absorption spectra based on, at least, individual absorption spectrum for each of a subset of one or more silicon-containing compounds selected from a larger set of known silicon-containing compounds with known concentrations; and a housing in which the source, the interferometer, the sample cell, the cooled detector and the processor are disposed. - View Dependent Claims (29, 30, 31)
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32. A computer readable product, tangibly embodied on a non-transitory information carrier or a machine readable storage device, and operable on a digital signal processor for a biogas detection system, the computer readable product including instructions operable to cause the digital signal processor to:
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receive a first spectral measurement of a non-absorptive gas in a sample cell, the non-absorptive gas having substantially no infrared absorptions in a specified wavelength range of interest; receive a second spectral measurement of a sample gas comprising a biogas in the sample cell, wherein the biogas includes one or more siloxane compounds; generate a first absorption spectrum based on a ratio of the first spectral measurement and the second spectral measurement; generate a set of surrogate absorption spectra based on, at least, individual absorption spectrum for each of a subset of one or more silicon-containing compounds selected from a larger set of known silicon-containing compounds with known concentrations; and perform a multiple regression analysis using the first absorption spectrum and the set of surrogate absorption spectra to calculate a total concentration of the one or more silicon-containing compounds in the biogas. - View Dependent Claims (33)
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Specification